Vendoring in libnetwork for native multihost networking

- brings in vxlan based native multihost networking
- added a daemon flag required by libkv for dist kv operations
- moved the daemon flags to experimental

Signed-off-by: Madhu Venugopal <madhu@docker.com>

daemon/config.go

@@ -33,6 +33,7 @@ type CommonConfig struct {
 	Root           string
 	TrustKeyPath   string
 	DefaultNetwork string
+	NetworkKVStore string
 }
 
 // InstallCommonFlags adds command-line options to the top-level flag parser for
@@ -51,7 +52,6 @@ func (config *Config) InstallCommonFlags() {
 	flag.IntVar(&config.Mtu, []string{"#mtu", "-mtu"}, 0, "Set the containers network MTU")
 	flag.BoolVar(&config.EnableCors, []string{"#api-enable-cors", "#-api-enable-cors"}, false, "Enable CORS headers in the remote API, this is deprecated by --api-cors-header")
 	flag.StringVar(&config.CorsHeaders, []string{"-api-cors-header"}, "", "Set CORS headers in the remote API")
-	flag.StringVar(&config.DefaultNetwork, []string{"-default-network"}, "", "Set default network")
 	// FIXME: why the inconsistency between "hosts" and "sockets"?
 	opts.IPListVar(&config.Dns, []string{"#dns", "-dns"}, "DNS server to use")
 	opts.DnsSearchListVar(&config.DnsSearch, []string{"-dns-search"}, "DNS search domains to use")

daemon/config_experimental.go

@@ -0,0 +1,10 @@
+// +build experimental
+
+package daemon
+
+import flag "github.com/docker/docker/pkg/mflag"
+
+func (config *Config) attachExperimentalFlags() {
+	flag.StringVar(&config.DefaultNetwork, []string{"-default-network"}, "", "Set default network")
+	flag.StringVar(&config.NetworkKVStore, []string{"-kv-store"}, "", "Set KV Store configuration")
+}

daemon/config_linux.go

@@ -73,4 +73,5 @@ func (config *Config) InstallFlags() {
 	flag.BoolVar(&config.Bridge.InterContainerCommunication, []string{"#icc", "-icc"}, true, "Enable inter-container communication")
 	opts.IPVar(&config.Bridge.DefaultIP, []string{"#ip", "-ip"}, "0.0.0.0", "Default IP when binding container ports")
 	flag.BoolVar(&config.Bridge.EnableUserlandProxy, []string{"-userland-proxy"}, true, "Use userland proxy for loopback traffic")
+	config.attachExperimentalFlags()
 }

daemon/config_stub.go

@@ -0,0 +1,6 @@
+// +build !experimental
+
+package daemon
+
+func (config *Config) attachExperimentalFlags() {
+}

daemon/container_linux.go

@@ -790,7 +790,11 @@ func (container *Container) AllocateNetwork() error {
 	}
 
 	if service == "" {
+		// dot character "." has a special meaning to support SERVICE[.NETWORK] format.
+		// For backward compatiblity, replacing "." with "-", instead of failing
 		service = strings.Replace(container.Name, ".", "-", -1)
+		// Service names dont like "/" in them. removing it instead of failing for backward compatibility
+		service = strings.Replace(service, "/", "", -1)
 	}
 
 	var err error

daemon/daemon_unix.go

@@ -285,6 +285,16 @@ func networkOptions(dconfig *Config) ([]nwconfig.Option, error) {
 		options = append(options, nwconfig.OptionDefaultDriver(string(dd)))
 		options = append(options, nwconfig.OptionDefaultNetwork(dn))
 	}
+
+	if strings.TrimSpace(dconfig.NetworkKVStore) != "" {
+		kv := strings.Split(dconfig.NetworkKVStore, ":")
+		if len(kv) < 2 {
+			return nil, fmt.Errorf("kv store daemon config must be of the form KV-PROVIDER:KV-URL")
+		}
+		options = append(options, nwconfig.OptionKVProvider(kv[0]))
+		options = append(options, nwconfig.OptionKVProviderURL(strings.Join(kv[1:], ":")))
+	}
+
 	options = append(options, nwconfig.OptionLabels(dconfig.Labels))
 	return options, nil
 }

experimental/README.md

@@ -45,7 +45,8 @@ Unlike the regular Docker binary, the experimental channels is built and updated
 ## Current experimental features
 
 * [Support for Docker plugins](plugins.md)
-* [Volume plugins](plugins_volume.md)
+  * [Volume plugins](plugins_volume.md)
+* [Native Multi-host networking](networking.md)
 
 ## How to comment on an experimental feature
 

experimental/networking.md

@@ -3,9 +3,13 @@
 In this feature:
 
 - `network` and `service` become a first class objects in the Docker UI
-- You can create networks and attach containers to them
-- We introduce the concept of `services`
-  - This is an entry-point in to a given network that is also published via Service Discovery
+  - one can now create networks, publish services on that network and attach containers to the services
+- Natice multi-host networking
+  - `network` and `service` objects are globally significant and provides multi-host container connectivity natively
+- Inbuilt simple Service Discovery
+  - With multi-host networking and top-level `service` object, Docker now provides out of the box simple Service Discovery for containers running in a network
+- Batteries included but removable
+  - Docker provides inbuilt native multi-host networking by default & can be swapped by any remote driver provided by external plugins.
 
 This is an experimental feature. For information on installing and using experimental features, see [the experimental feature overview](experimental.md).
 
@@ -62,11 +66,14 @@ If you no longer have need of a network, you can delete it with `docker network
         bd61375b6993        host                host
         cc455abccfeb        bridge              bridge
 
-Docker daemon supports a configuration flag `--default-network` which takes configuration value of format `NETWORK:DRIVER`, where,
-`NETWORK` is the name of the network created using the `docker network create` command and 
+## User-Defined default network
+
+Docker daemon supports a configuration flag `--default-network` which takes configuration value of format `DRIVER:NETWORK`, where,
 `DRIVER` represents the in-built drivers such as bridge, overlay, container, host and none. or Remote drivers via Network Plugins.
+`NETWORK` is the name of the network created using the `docker network create` command
 When a container is created and if the network mode (`--net`) is not specified, then this default network will be used to connect
 the container. If `--default-network` is not specified, the default network will be the `bridge` driver.
+Example : `docker -d --default-network=overlay:multihost`
 
 ## Using Services
 
@@ -109,6 +116,20 @@ To remove the a service:
         $ docker service detach a0ebc12d3e48 my-service.foo
         $ docker service unpublish my-service.foo
 
-Send us feedback and comments on [#](https://github.com/docker/docker/issues/?),
+
+## Native Multi-host networking
+
+There is a lot to talk about the native multi-host networking and the `overlay` driver that makes it happen. The technical details are documented under https://github.com/docker/libnetwork/blob/master/docs/overlay.md.
+Using the above experimental UI `docker network`, `docker service` and `--publish-service`, the user can exercise the power of multi-host networking.
+
+Since `network` and `service` objects are globally significant, this feature requires distributed states provided by the `libkv` project.
+Using `libkv`, the user can plug any of the supported Key-Value store (such as consul, etcd or zookeeper).
+User can specify the Key-Value store of choice using the `--kv-store` daemon flag, which takes configuration value of format `PROVIDER:URL`, where
+`PROVIDER` is the name of the Key-Value store (such as consul, etcd or zookeeper) and
+`URL` is the url to reach the Key-Value store.
+Example : `docker -d --kv-store=consul:localhost:8500`
+
+
+Send us feedback and comments on [#14083](https://github.com/docker/docker/issues/14083)
 or on the usual Google Groups (docker-user, docker-dev) and IRC channels.
 

hack/vendor.sh

@@ -18,7 +18,11 @@ clone git golang.org/x/net 3cffabab72adf04f8e3b01c5baf775361837b5fe https://gith
 clone hg code.google.com/p/gosqlite 74691fb6f837
 
 #get libnetwork packages
-clone git github.com/docker/libnetwork fc7abaa93fd33a77cc37845adbbc4adf03676dd5
+clone git github.com/docker/libnetwork 1aaf1047fd48345619a875184538a0eb6c6cfb2a
+clone git github.com/armon/go-metrics eb0af217e5e9747e41dd5303755356b62d28e3ec
+clone git github.com/hashicorp/go-msgpack 71c2886f5a673a35f909803f38ece5810165097b
+clone git github.com/hashicorp/memberlist 9a1e242e454d2443df330bdd51a436d5a9058fc4
+clone git github.com/hashicorp/serf 7151adcef72687bf95f451a2e0ba15cb19412bf2
 clone git github.com/docker/libkv e8cde779d58273d240c1eff065352a6cd67027dd
 clone git github.com/vishvananda/netns 5478c060110032f972e86a1f844fdb9a2f008f2c
 clone git github.com/vishvananda/netlink 8eb64238879fed52fd51c5b30ad20b928fb4c36c

integration-cli/docker_cli_daemon_experimental_test.go

@@ -0,0 +1,39 @@
+// +build daemon,experimental
+
+package main
+
+import (
+	"os/exec"
+	"strings"
+
+	"github.com/go-check/check"
+)
+
+func assertNetwork(c *check.C, d *Daemon, name string) {
+	out, err := d.Cmd("network", "ls")
+	c.Assert(err, check.IsNil)
+	lines := strings.Split(out, "\n")
+	for i := 1; i < len(lines)-1; i++ {
+		if strings.Contains(lines[i], name) {
+			return
+		}
+	}
+	c.Fatalf("Network %s not found in network ls o/p", name)
+}
+
+func (s *DockerDaemonSuite) TestDaemonDefaultNetwork(c *check.C) {
+	d := s.d
+
+	networkName := "testdefault"
+	err := d.StartWithBusybox("--default-network", "bridge:"+networkName)
+	c.Assert(err, check.IsNil)
+
+	_, err = d.Cmd("run", "busybox", "true")
+	c.Assert(err, check.IsNil)
+
+	assertNetwork(c, d, networkName)
+
+	ifconfigCmd := exec.Command("ifconfig", networkName)
+	_, _, _, err = runCommandWithStdoutStderr(ifconfigCmd)
+	c.Assert(err, check.IsNil)
+}

vendor/src/github.com/armon/go-metrics/.gitignore

@@ -0,0 +1,22 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe

vendor/src/github.com/armon/go-metrics/LICENSE

@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Armon Dadgar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/src/github.com/armon/go-metrics/README.md

@@ -0,0 +1,68 @@
+go-metrics
+==========
+
+This library provides a `metrics` package which can be used to instrument code,
+expose application metrics, and profile runtime performance in a flexible manner.
+
+Sinks
+=====
+
+The `metrics` package makes use of a `MetricSink` interface to support delivery
+to any type of backend. Currently the following sinks are provided:
+
+* StatsiteSink : Sinks to a statsite instance (TCP)
+* StatsdSink: Sinks to a statsd / statsite instance (UDP)
+* InmemSink : Provides in-memory aggregation, can be used to export stats
+* FanoutSink : Sinks to multiple sinks. Enables writing to multiple statsite instances for example.
+* BlackholeSink : Sinks to nowhere
+
+In addition to the sinks, the `InmemSignal` can be used to catch a signal,
+and dump a formatted output of recent metrics. For example, when a process gets
+a SIGUSR1, it can dump to stderr recent performance metrics for debugging.
+
+Examples
+========
+
+Here is an example of using the package:
+
+    func SlowMethod() {
+        // Profiling the runtime of a method
+        defer metrics.MeasureSince([]string{"SlowMethod"}, time.Now())
+    }
+
+    // Configure a statsite sink as the global metrics sink
+    sink, _ := metrics.NewStatsiteSink("statsite:8125")
+    metrics.NewGlobal(metrics.DefaultConfig("service-name"), sink)
+
+    // Emit a Key/Value pair
+    metrics.EmitKey([]string{"questions", "meaning of life"}, 42)
+
+
+Here is an example of setting up an signal handler:
+
+    // Setup the inmem sink and signal handler
+    inm := NewInmemSink(10*time.Second, time.Minute)
+    sig := DefaultInmemSignal(inm)
+    metrics.NewGlobal(metrics.DefaultConfig("service-name"), inm)
+
+    // Run some code
+    inm.SetGauge([]string{"foo"}, 42)
+	inm.EmitKey([]string{"bar"}, 30)
+
+	inm.IncrCounter([]string{"baz"}, 42)
+	inm.IncrCounter([]string{"baz"}, 1)
+	inm.IncrCounter([]string{"baz"}, 80)
+
+	inm.AddSample([]string{"method", "wow"}, 42)
+	inm.AddSample([]string{"method", "wow"}, 100)
+	inm.AddSample([]string{"method", "wow"}, 22)
+
+    ....
+
+When a signal comes in, output like the following will be dumped to stderr:
+
+    [2014-01-28 14:57:33.04 -0800 PST][G] 'foo': 42.000
+    [2014-01-28 14:57:33.04 -0800 PST][P] 'bar': 30.000
+	[2014-01-28 14:57:33.04 -0800 PST][C] 'baz': Count: 3 Min: 1.000 Mean: 41.000 Max: 80.000 Stddev: 39.509
+    [2014-01-28 14:57:33.04 -0800 PST][S] 'method.wow': Count: 3 Min: 22.000 Mean: 54.667 Max: 100.000 Stddev: 40.513
+

vendor/src/github.com/armon/go-metrics/const_unix.go

@@ -0,0 +1,12 @@
+// +build !windows
+
+package metrics
+
+import (
+	"syscall"
+)
+
+const (
+	// DefaultSignal is used with DefaultInmemSignal
+	DefaultSignal = syscall.SIGUSR1
+)

vendor/src/github.com/armon/go-metrics/const_windows.go

@@ -0,0 +1,13 @@
+// +build windows
+
+package metrics
+
+import (
+	"syscall"
+)
+
+const (
+	// DefaultSignal is used with DefaultInmemSignal
+	// Windows has no SIGUSR1, use SIGBREAK
+	DefaultSignal = syscall.Signal(21)
+)

vendor/src/github.com/armon/go-metrics/inmem.go

@@ -0,0 +1,239 @@
+package metrics
+
+import (
+	"fmt"
+	"math"
+	"strings"
+	"sync"
+	"time"
+)
+
+// InmemSink provides a MetricSink that does in-memory aggregation
+// without sending metrics over a network. It can be embedded within
+// an application to provide profiling information.
+type InmemSink struct {
+	// How long is each aggregation interval
+	interval time.Duration
+
+	// Retain controls how many metrics interval we keep
+	retain time.Duration
+
+	// maxIntervals is the maximum length of intervals.
+	// It is retain / interval.
+	maxIntervals int
+
+	// intervals is a slice of the retained intervals
+	intervals    []*IntervalMetrics
+	intervalLock sync.RWMutex
+}
+
+// IntervalMetrics stores the aggregated metrics
+// for a specific interval
+type IntervalMetrics struct {
+	sync.RWMutex
+
+	// The start time of the interval
+	Interval time.Time
+
+	// Gauges maps the key to the last set value
+	Gauges map[string]float32
+
+	// Points maps the string to the list of emitted values
+	// from EmitKey
+	Points map[string][]float32
+
+	// Counters maps the string key to a sum of the counter
+	// values
+	Counters map[string]*AggregateSample
+
+	// Samples maps the key to an AggregateSample,
+	// which has the rolled up view of a sample
+	Samples map[string]*AggregateSample
+}
+
+// NewIntervalMetrics creates a new IntervalMetrics for a given interval
+func NewIntervalMetrics(intv time.Time) *IntervalMetrics {
+	return &IntervalMetrics{
+		Interval: intv,
+		Gauges:   make(map[string]float32),
+		Points:   make(map[string][]float32),
+		Counters: make(map[string]*AggregateSample),
+		Samples:  make(map[string]*AggregateSample),
+	}
+}
+
+// AggregateSample is used to hold aggregate metrics
+// about a sample
+type AggregateSample struct {
+	Count int     // The count of emitted pairs
+	Sum   float64 // The sum of values
+	SumSq float64 // The sum of squared values
+	Min   float64 // Minimum value
+	Max   float64 // Maximum value
+}
+
+// Computes a Stddev of the values
+func (a *AggregateSample) Stddev() float64 {
+	num := (float64(a.Count) * a.SumSq) - math.Pow(a.Sum, 2)
+	div := float64(a.Count * (a.Count - 1))
+	if div == 0 {
+		return 0
+	}
+	return math.Sqrt(num / div)
+}
+
+// Computes a mean of the values
+func (a *AggregateSample) Mean() float64 {
+	if a.Count == 0 {
+		return 0
+	}
+	return a.Sum / float64(a.Count)
+}
+
+// Ingest is used to update a sample
+func (a *AggregateSample) Ingest(v float64) {
+	a.Count++
+	a.Sum += v
+	a.SumSq += (v * v)
+	if v < a.Min || a.Count == 1 {
+		a.Min = v
+	}
+	if v > a.Max || a.Count == 1 {
+		a.Max = v
+	}
+}
+
+func (a *AggregateSample) String() string {
+	if a.Count == 0 {
+		return "Count: 0"
+	} else if a.Stddev() == 0 {
+		return fmt.Sprintf("Count: %d Sum: %0.3f", a.Count, a.Sum)
+	} else {
+		return fmt.Sprintf("Count: %d Min: %0.3f Mean: %0.3f Max: %0.3f Stddev: %0.3f Sum: %0.3f",
+			a.Count, a.Min, a.Mean(), a.Max, a.Stddev(), a.Sum)
+	}
+}
+
+// NewInmemSink is used to construct a new in-memory sink.
+// Uses an aggregation interval and maximum retention period.
+func NewInmemSink(interval, retain time.Duration) *InmemSink {
+	i := &InmemSink{
+		interval:     interval,
+		retain:       retain,
+		maxIntervals: int(retain / interval),
+	}
+	i.intervals = make([]*IntervalMetrics, 0, i.maxIntervals)
+	return i
+}
+
+func (i *InmemSink) SetGauge(key []string, val float32) {
+	k := i.flattenKey(key)
+	intv := i.getInterval()
+
+	intv.Lock()
+	defer intv.Unlock()
+	intv.Gauges[k] = val
+}
+
+func (i *InmemSink) EmitKey(key []string, val float32) {
+	k := i.flattenKey(key)
+	intv := i.getInterval()
+
+	intv.Lock()
+	defer intv.Unlock()
+	vals := intv.Points[k]
+	intv.Points[k] = append(vals, val)
+}
+
+func (i *InmemSink) IncrCounter(key []string, val float32) {
+	k := i.flattenKey(key)
+	intv := i.getInterval()
+
+	intv.Lock()
+	defer intv.Unlock()
+
+	agg := intv.Counters[k]
+	if agg == nil {
+		agg = &AggregateSample{}
+		intv.Counters[k] = agg
+	}
+	agg.Ingest(float64(val))
+}
+
+func (i *InmemSink) AddSample(key []string, val float32) {
+	k := i.flattenKey(key)
+	intv := i.getInterval()
+
+	intv.Lock()
+	defer intv.Unlock()
+
+	agg := intv.Samples[k]
+	if agg == nil {
+		agg = &AggregateSample{}
+		intv.Samples[k] = agg
+	}
+	agg.Ingest(float64(val))
+}
+
+// Data is used to retrieve all the aggregated metrics
+// Intervals may be in use, and a read lock should be acquired
+func (i *InmemSink) Data() []*IntervalMetrics {
+	// Get the current interval, forces creation
+	i.getInterval()
+
+	i.intervalLock.RLock()
+	defer i.intervalLock.RUnlock()
+
+	intervals := make([]*IntervalMetrics, len(i.intervals))
+	copy(intervals, i.intervals)
+	return intervals
+}
+
+func (i *InmemSink) getExistingInterval(intv time.Time) *IntervalMetrics {
+	i.intervalLock.RLock()
+	defer i.intervalLock.RUnlock()
+
+	n := len(i.intervals)
+	if n > 0 && i.intervals[n-1].Interval == intv {
+		return i.intervals[n-1]
+	}
+	return nil
+}
+
+func (i *InmemSink) createInterval(intv time.Time) *IntervalMetrics {
+	i.intervalLock.Lock()
+	defer i.intervalLock.Unlock()
+
+	// Check for an existing interval
+	n := len(i.intervals)
+	if n > 0 && i.intervals[n-1].Interval == intv {
+		return i.intervals[n-1]
+	}
+
+	// Add the current interval
+	current := NewIntervalMetrics(intv)
+	i.intervals = append(i.intervals, current)
+	n++
+
+	// Truncate the intervals if they are too long
+	if n >= i.maxIntervals {
+		copy(i.intervals[0:], i.intervals[n-i.maxIntervals:])
+		i.intervals = i.intervals[:i.maxIntervals]
+	}
+	return current
+}
+
+// getInterval returns the current interval to write to
+func (i *InmemSink) getInterval() *IntervalMetrics {
+	intv := time.Now().Truncate(i.interval)
+	if m := i.getExistingInterval(intv); m != nil {
+		return m
+	}
+	return i.createInterval(intv)
+}
+
+// Flattens the key for formatting, removes spaces
+func (i *InmemSink) flattenKey(parts []string) string {
+	joined := strings.Join(parts, ".")
+	return strings.Replace(joined, " ", "_", -1)
+}

vendor/src/github.com/armon/go-metrics/inmem_signal.go

@@ -0,0 +1,100 @@
+package metrics
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+)
+
+// InmemSignal is used to listen for a given signal, and when received,
+// to dump the current metrics from the InmemSink to an io.Writer
+type InmemSignal struct {
+	signal syscall.Signal
+	inm    *InmemSink
+	w      io.Writer
+	sigCh  chan os.Signal
+
+	stop     bool
+	stopCh   chan struct{}
+	stopLock sync.Mutex
+}
+
+// NewInmemSignal creates a new InmemSignal which listens for a given signal,
+// and dumps the current metrics out to a writer
+func NewInmemSignal(inmem *InmemSink, sig syscall.Signal, w io.Writer) *InmemSignal {
+	i := &InmemSignal{
+		signal: sig,
+		inm:    inmem,
+		w:      w,
+		sigCh:  make(chan os.Signal, 1),
+		stopCh: make(chan struct{}),
+	}
+	signal.Notify(i.sigCh, sig)
+	go i.run()
+	return i
+}
+
+// DefaultInmemSignal returns a new InmemSignal that responds to SIGUSR1
+// and writes output to stderr. Windows uses SIGBREAK
+func DefaultInmemSignal(inmem *InmemSink) *InmemSignal {
+	return NewInmemSignal(inmem, DefaultSignal, os.Stderr)
+}
+
+// Stop is used to stop the InmemSignal from listening
+func (i *InmemSignal) Stop() {
+	i.stopLock.Lock()
+	defer i.stopLock.Unlock()
+
+	if i.stop {
+		return
+	}
+	i.stop = true
+	close(i.stopCh)
+	signal.Stop(i.sigCh)
+}
+
+// run is a long running routine that handles signals
+func (i *InmemSignal) run() {
+	for {
+		select {
+		case <-i.sigCh:
+			i.dumpStats()
+		case <-i.stopCh:
+			return
+		}
+	}
+}
+
+// dumpStats is used to dump the data to output writer
+func (i *InmemSignal) dumpStats() {
+	buf := bytes.NewBuffer(nil)
+
+	data := i.inm.Data()
+	// Skip the last period which is still being aggregated
+	for i := 0; i < len(data)-1; i++ {
+		intv := data[i]
+		intv.RLock()
+		for name, val := range intv.Gauges {
+			fmt.Fprintf(buf, "[%v][G] '%s': %0.3f\n", intv.Interval, name, val)
+		}
+		for name, vals := range intv.Points {
+			for _, val := range vals {
+				fmt.Fprintf(buf, "[%v][P] '%s': %0.3f\n", intv.Interval, name, val)
+			}
+		}
+		for name, agg := range intv.Counters {
+			fmt.Fprintf(buf, "[%v][C] '%s': %s\n", intv.Interval, name, agg)
+		}
+		for name, agg := range intv.Samples {
+			fmt.Fprintf(buf, "[%v][S] '%s': %s\n", intv.Interval, name, agg)
+		}
+		intv.RUnlock()
+	}
+
+	// Write out the bytes
+	i.w.Write(buf.Bytes())
+}

vendor/src/github.com/armon/go-metrics/metrics.go

@@ -0,0 +1,115 @@
+package metrics
+
+import (
+	"runtime"
+	"time"
+)
+
+func (m *Metrics) SetGauge(key []string, val float32) {
+	if m.HostName != "" && m.EnableHostname {
+		key = insert(0, m.HostName, key)
+	}
+	if m.EnableTypePrefix {
+		key = insert(0, "gauge", key)
+	}
+	if m.ServiceName != "" {
+		key = insert(0, m.ServiceName, key)
+	}
+	m.sink.SetGauge(key, val)
+}
+
+func (m *Metrics) EmitKey(key []string, val float32) {
+	if m.EnableTypePrefix {
+		key = insert(0, "kv", key)
+	}
+	if m.ServiceName != "" {
+		key = insert(0, m.ServiceName, key)
+	}
+	m.sink.EmitKey(key, val)
+}
+
+func (m *Metrics) IncrCounter(key []string, val float32) {
+	if m.EnableTypePrefix {
+		key = insert(0, "counter", key)
+	}
+	if m.ServiceName != "" {
+		key = insert(0, m.ServiceName, key)
+	}
+	m.sink.IncrCounter(key, val)
+}
+
+func (m *Metrics) AddSample(key []string, val float32) {
+	if m.EnableTypePrefix {
+		key = insert(0, "sample", key)
+	}
+	if m.ServiceName != "" {
+		key = insert(0, m.ServiceName, key)
+	}
+	m.sink.AddSample(key, val)
+}
+
+func (m *Metrics) MeasureSince(key []string, start time.Time) {
+	if m.EnableTypePrefix {
+		key = insert(0, "timer", key)
+	}
+	if m.ServiceName != "" {
+		key = insert(0, m.ServiceName, key)
+	}
+	now := time.Now()
+	elapsed := now.Sub(start)
+	msec := float32(elapsed.Nanoseconds()) / float32(m.TimerGranularity)
+	m.sink.AddSample(key, msec)
+}
+
+// Periodically collects runtime stats to publish
+func (m *Metrics) collectStats() {
+	for {
+		time.Sleep(m.ProfileInterval)
+		m.emitRuntimeStats()
+	}
+}
+
+// Emits various runtime statsitics
+func (m *Metrics) emitRuntimeStats() {
+	// Export number of Goroutines
+	numRoutines := runtime.NumGoroutine()
+	m.SetGauge([]string{"runtime", "num_goroutines"}, float32(numRoutines))
+
+	// Export memory stats
+	var stats runtime.MemStats
+	runtime.ReadMemStats(&stats)
+	m.SetGauge([]string{"runtime", "alloc_bytes"}, float32(stats.Alloc))
+	m.SetGauge([]string{"runtime", "sys_bytes"}, float32(stats.Sys))
+	m.SetGauge([]string{"runtime", "malloc_count"}, float32(stats.Mallocs))
+	m.SetGauge([]string{"runtime", "free_count"}, float32(stats.Frees))
+	m.SetGauge([]string{"runtime", "heap_objects"}, float32(stats.HeapObjects))
+	m.SetGauge([]string{"runtime", "total_gc_pause_ns"}, float32(stats.PauseTotalNs))
+	m.SetGauge([]string{"runtime", "total_gc_runs"}, float32(stats.NumGC))
+
+	// Export info about the last few GC runs
+	num := stats.NumGC
+
+	// Handle wrap around
+	if num < m.lastNumGC {
+		m.lastNumGC = 0
+	}
+
+	// Ensure we don't scan more than 256
+	if num-m.lastNumGC >= 256 {
+		m.lastNumGC = num - 255
+	}
+
+	for i := m.lastNumGC; i < num; i++ {
+		pause := stats.PauseNs[i%256]
+		m.AddSample([]string{"runtime", "gc_pause_ns"}, float32(pause))
+	}
+	m.lastNumGC = num
+}
+
+// Inserts a string value at an index into the slice
+func insert(i int, v string, s []string) []string {
+	s = append(s, "")
+	copy(s[i+1:], s[i:])
+	s[i] = v
+	return s
+}

vendor/src/github.com/armon/go-metrics/sink.go

@@ -0,0 +1,52 @@
+package metrics
+
+// The MetricSink interface is used to transmit metrics information
+// to an external system
+type MetricSink interface {
+	// A Gauge should retain the last value it is set to
+	SetGauge(key []string, val float32)
+
+	// Should emit a Key/Value pair for each call
+	EmitKey(key []string, val float32)
+
+	// Counters should accumulate values
+	IncrCounter(key []string, val float32)
+
+	// Samples are for timing information, where quantiles are used
+	AddSample(key []string, val float32)
+}
+
+// BlackholeSink is used to just blackhole messages
+type BlackholeSink struct{}
+
+func (*BlackholeSink) SetGauge(key []string, val float32)    {}
+func (*BlackholeSink) EmitKey(key []string, val float32)     {}
+func (*BlackholeSink) IncrCounter(key []string, val float32) {}
+func (*BlackholeSink) AddSample(key []string, val float32)   {}
+
+// FanoutSink is used to sink to fanout values to multiple sinks
+type FanoutSink []MetricSink
+
+func (fh FanoutSink) SetGauge(key []string, val float32) {
+	for _, s := range fh {
+		s.SetGauge(key, val)
+	}
+}
+
+func (fh FanoutSink) EmitKey(key []string, val float32) {
+	for _, s := range fh {
+		s.EmitKey(key, val)
+	}
+}
+
+func (fh FanoutSink) IncrCounter(key []string, val float32) {
+	for _, s := range fh {
+		s.IncrCounter(key, val)
+	}
+}
+
+func (fh FanoutSink) AddSample(key []string, val float32) {
+	for _, s := range fh {
+		s.AddSample(key, val)
+	}
+}

vendor/src/github.com/armon/go-metrics/start.go

@@ -0,0 +1,95 @@
+package metrics
+
+import (
+	"os"
+	"time"
+)
+
+// Config is used to configure metrics settings
+type Config struct {
+	ServiceName          string        // Prefixed with keys to seperate services
+	HostName             string        // Hostname to use. If not provided and EnableHostname, it will be os.Hostname
+	EnableHostname       bool          // Enable prefixing gauge values with hostname
+	EnableRuntimeMetrics bool          // Enables profiling of runtime metrics (GC, Goroutines, Memory)
+	EnableTypePrefix     bool          // Prefixes key with a type ("counter", "gauge", "timer")
+	TimerGranularity     time.Duration // Granularity of timers.
+	ProfileInterval      time.Duration // Interval to profile runtime metrics
+}
+
+// Metrics represents an instance of a metrics sink that can
+// be used to emit
+type Metrics struct {
+	Config
+	lastNumGC uint32
+	sink      MetricSink
+}
+
+// Shared global metrics instance
+var globalMetrics *Metrics
+
+func init() {
+	// Initialize to a blackhole sink to avoid errors
+	globalMetrics = &Metrics{sink: &BlackholeSink{}}
+}
+
+// DefaultConfig provides a sane default configuration
+func DefaultConfig(serviceName string) *Config {
+	c := &Config{
+		ServiceName:          serviceName, // Use client provided service
+		HostName:             "",
+		EnableHostname:       true,             // Enable hostname prefix
+		EnableRuntimeMetrics: true,             // Enable runtime profiling
+		EnableTypePrefix:     false,            // Disable type prefix
+		TimerGranularity:     time.Millisecond, // Timers are in milliseconds
+		ProfileInterval:      time.Second,      // Poll runtime every second
+	}
+
+	// Try to get the hostname
+	name, _ := os.Hostname()
+	c.HostName = name
+	return c
+}
+
+// New is used to create a new instance of Metrics
+func New(conf *Config, sink MetricSink) (*Metrics, error) {
+	met := &Metrics{}
+	met.Config = *conf
+	met.sink = sink
+
+	// Start the runtime collector
+	if conf.EnableRuntimeMetrics {
+		go met.collectStats()
+	}
+	return met, nil
+}
+
+// NewGlobal is the same as New, but it assigns the metrics object to be
+// used globally as well as returning it.
+func NewGlobal(conf *Config, sink MetricSink) (*Metrics, error) {
+	metrics, err := New(conf, sink)
+	if err == nil {
+		globalMetrics = metrics
+	}
+	return metrics, err
+}
+
+// Proxy all the methods to the globalMetrics instance
+func SetGauge(key []string, val float32) {
+	globalMetrics.SetGauge(key, val)
+}
+
+func EmitKey(key []string, val float32) {
+	globalMetrics.EmitKey(key, val)
+}
+
+func IncrCounter(key []string, val float32) {
+	globalMetrics.IncrCounter(key, val)
+}
+
+func AddSample(key []string, val float32) {
+	globalMetrics.AddSample(key, val)
+}
+
+func MeasureSince(key []string, start time.Time) {
+	globalMetrics.MeasureSince(key, start)
+}

vendor/src/github.com/armon/go-metrics/statsd.go

@@ -0,0 +1,154 @@
+package metrics
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"net"
+	"strings"
+	"time"
+)
+
+const (
+	// statsdMaxLen is the maximum size of a packet
+	// to send to statsd
+	statsdMaxLen = 1400
+)
+
+// StatsdSink provides a MetricSink that can be used
+// with a statsite or statsd metrics server. It uses
+// only UDP packets, while StatsiteSink uses TCP.
+type StatsdSink struct {
+	addr        string
+	metricQueue chan string
+}
+
+// NewStatsdSink is used to create a new StatsdSink
+func NewStatsdSink(addr string) (*StatsdSink, error) {
+	s := &StatsdSink{
+		addr:        addr,
+		metricQueue: make(chan string, 4096),
+	}
+	go s.flushMetrics()
+	return s, nil
+}
+
+// Close is used to stop flushing to statsd
+func (s *StatsdSink) Shutdown() {
+	close(s.metricQueue)
+}
+
+func (s *StatsdSink) SetGauge(key []string, val float32) {
+	flatKey := s.flattenKey(key)
+	s.pushMetric(fmt.Sprintf("%s:%f|g\n", flatKey, val))
+}
+
+func (s *StatsdSink) EmitKey(key []string, val float32) {
+	flatKey := s.flattenKey(key)
+	s.pushMetric(fmt.Sprintf("%s:%f|kv\n", flatKey, val))
+}
+
+func (s *StatsdSink) IncrCounter(key []string, val float32) {
+	flatKey := s.flattenKey(key)
+	s.pushMetric(fmt.Sprintf("%s:%f|c\n", flatKey, val))
+}
+
+func (s *StatsdSink) AddSample(key []string, val float32) {
+	flatKey := s.flattenKey(key)
+	s.pushMetric(fmt.Sprintf("%s:%f|ms\n", flatKey, val))
+}
+
+// Flattens the key for formatting, removes spaces
+func (s *StatsdSink) flattenKey(parts []string) string {
+	joined := strings.Join(parts, ".")
+	return strings.Map(func(r rune) rune {
+		switch r {
+		case ':':
+			fallthrough
+		case ' ':
+			return '_'
+		default:
+			return r
+		}
+	}, joined)
+}
+
+// Does a non-blocking push to the metrics queue
+func (s *StatsdSink) pushMetric(m string) {
+	select {
+	case s.metricQueue <- m:
+	default:
+	}
+}
+
+// Flushes metrics
+func (s *StatsdSink) flushMetrics() {
+	var sock net.Conn
+	var err error
+	var wait <-chan time.Time
+	ticker := time.NewTicker(flushInterval)
+	defer ticker.Stop()
+
+CONNECT:
+	// Create a buffer
+	buf := bytes.NewBuffer(nil)
+
+	// Attempt to connect
+	sock, err = net.Dial("udp", s.addr)
+	if err != nil {
+		log.Printf("[ERR] Error connecting to statsd! Err: %s", err)
+		goto WAIT
+	}
+
+	for {
+		select {
+		case metric, ok := <-s.metricQueue:
+			// Get a metric from the queue
+			if !ok {
+				goto QUIT
+			}
+
+			// Check if this would overflow the packet size
+			if len(metric)+buf.Len() > statsdMaxLen {
+				_, err := sock.Write(buf.Bytes())
+				buf.Reset()
+				if err != nil {
+					log.Printf("[ERR] Error writing to statsd! Err: %s", err)
+					goto WAIT
+				}
+			}
+
+			// Append to the buffer
+			buf.WriteString(metric)
+
+		case <-ticker.C:
+			if buf.Len() == 0 {
+				continue
+			}
+
+			_, err := sock.Write(buf.Bytes())
+			buf.Reset()
+			if err != nil {
+				log.Printf("[ERR] Error flushing to statsd! Err: %s", err)
+				goto WAIT
+			}
+		}
+	}
+
+WAIT:
+	// Wait for a while
+	wait = time.After(time.Duration(5) * time.Second)
+	for {
+		select {
+		// Dequeue the messages to avoid backlog
+		case _, ok := <-s.metricQueue:
+			if !ok {
+				goto QUIT
+			}
+		case <-wait:
+			goto CONNECT
+		}
+	}
+QUIT:
+	s.metricQueue = nil
+}

vendor/src/github.com/armon/go-metrics/statsite.go

@@ -0,0 +1,142 @@
+package metrics
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"net"
+	"strings"
+	"time"
+)
+
+const (
+	// We force flush the statsite metrics after this period of
+	// inactivity. Prevents stats from getting stuck in a buffer
+	// forever.
+	flushInterval = 100 * time.Millisecond
+)
+
+// StatsiteSink provides a MetricSink that can be used with a
+// statsite metrics server
+type StatsiteSink struct {
+	addr        string
+	metricQueue chan string
+}
+
+// NewStatsiteSink is used to create a new StatsiteSink
+func NewStatsiteSink(addr string) (*StatsiteSink, error) {
+	s := &StatsiteSink{
+		addr:        addr,
+		metricQueue: make(chan string, 4096),
+	}
+	go s.flushMetrics()
+	return s, nil
+}
+
+// Close is used to stop flushing to statsite
+func (s *StatsiteSink) Shutdown() {
+	close(s.metricQueue)
+}
+
+func (s *StatsiteSink) SetGauge(key []string, val float32) {
+	flatKey := s.flattenKey(key)
+	s.pushMetric(fmt.Sprintf("%s:%f|g\n", flatKey, val))
+}
+
+func (s *StatsiteSink) EmitKey(key []string, val float32) {
+	flatKey := s.flattenKey(key)
+	s.pushMetric(fmt.Sprintf("%s:%f|kv\n", flatKey, val))
+}
+
+func (s *StatsiteSink) IncrCounter(key []string, val float32) {
+	flatKey := s.flattenKey(key)
+	s.pushMetric(fmt.Sprintf("%s:%f|c\n", flatKey, val))
+}
+
+func (s *StatsiteSink) AddSample(key []string, val float32) {
+	flatKey := s.flattenKey(key)
+	s.pushMetric(fmt.Sprintf("%s:%f|ms\n", flatKey, val))
+}
+
+// Flattens the key for formatting, removes spaces
+func (s *StatsiteSink) flattenKey(parts []string) string {
+	joined := strings.Join(parts, ".")
+	return strings.Map(func(r rune) rune {
+		switch r {
+		case ':':
+			fallthrough
+		case ' ':
+			return '_'
+		default:
+			return r
+		}
+	}, joined)
+}
+
+// Does a non-blocking push to the metrics queue
+func (s *StatsiteSink) pushMetric(m string) {
+	select {
+	case s.metricQueue <- m:
+	default:
+	}
+}
+
+// Flushes metrics
+func (s *StatsiteSink) flushMetrics() {
+	var sock net.Conn
+	var err error
+	var wait <-chan time.Time
+	var buffered *bufio.Writer
+	ticker := time.NewTicker(flushInterval)
+	defer ticker.Stop()
+
+CONNECT:
+	// Attempt to connect
+	sock, err = net.Dial("tcp", s.addr)
+	if err != nil {
+		log.Printf("[ERR] Error connecting to statsite! Err: %s", err)
+		goto WAIT
+	}
+
+	// Create a buffered writer
+	buffered = bufio.NewWriter(sock)
+
+	for {
+		select {
+		case metric, ok := <-s.metricQueue:
+			// Get a metric from the queue
+			if !ok {
+				goto QUIT
+			}
+
+			// Try to send to statsite
+			_, err := buffered.Write([]byte(metric))
+			if err != nil {
+				log.Printf("[ERR] Error writing to statsite! Err: %s", err)
+				goto WAIT
+			}
+		case <-ticker.C:
+			if err := buffered.Flush(); err != nil {
+				log.Printf("[ERR] Error flushing to statsite! Err: %s", err)
+				goto WAIT
+			}
+		}
+	}
+
+WAIT:
+	// Wait for a while
+	wait = time.After(time.Duration(5) * time.Second)
+	for {
+		select {
+		// Dequeue the messages to avoid backlog
+		case _, ok := <-s.metricQueue:
+			if !ok {
+				goto QUIT
+			}
+		case <-wait:
+			goto CONNECT
+		}
+	}
+QUIT:
+	s.metricQueue = nil
+}

vendor/src/github.com/docker/libnetwork/bitseq/sequence.go

@@ -0,0 +1,459 @@
+// Package bitseq provides a structure and utilities for representing long bitmask
+// as sequence of run-lenght encoded blocks. It operates direclty on the encoded
+// representation, it does not decode/encode.
+package bitseq
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/docker/libnetwork/datastore"
+	"github.com/docker/libnetwork/netutils"
+)
+
+// Block Sequence constants
+// If needed we can think of making these configurable
+const (
+	blockLen      = 32
+	blockBytes    = blockLen / 8
+	blockMAX      = 1<<blockLen - 1
+	blockFirstBit = 1 << (blockLen - 1)
+)
+
+// Handle contains the sequece representing the bitmask and its identifier
+type Handle struct {
+	bits       uint32
+	unselected uint32
+	head       *Sequence
+	app        string
+	id         string
+	dbIndex    uint64
+	store      datastore.DataStore
+	sync.Mutex
+}
+
+// NewHandle returns a thread-safe instance of the bitmask handler
+func NewHandle(app string, ds datastore.DataStore, id string, numElements uint32) (*Handle, error) {
+	h := &Handle{
+		app:        app,
+		id:         id,
+		store:      ds,
+		bits:       numElements,
+		unselected: numElements,
+		head: &Sequence{
+			Block: 0x0,
+			Count: getNumBlocks(numElements),
+		},
+	}
+
+	if h.store == nil {
+		return h, nil
+	}
+
+	// Register for status changes
+	h.watchForChanges()
+
+	// Get the initial status from the ds if present.
+	// We will be getting an instance without a dbIndex
+	// (GetObject() does not set it): It is ok for now,
+	// it will only cause the first allocation on this
+	// node to go through a retry.
+	var bah []byte
+	if err := h.store.GetObject(datastore.Key(h.Key()...), &bah); err != nil {
+		if err != datastore.ErrKeyNotFound {
+			return nil, err
+		}
+		return h, nil
+	}
+	err := h.FromByteArray(bah)
+
+	return h, err
+}
+
+// Sequence reresents a recurring sequence of 32 bits long bitmasks
+type Sequence struct {
+	Block uint32    // block representing 4 byte long allocation bitmask
+	Count uint32    // number of consecutive blocks
+	Next  *Sequence // next sequence
+}
+
+// NewSequence returns a sequence initialized to represent a bitmaks of numElements bits
+func NewSequence(numElements uint32) *Sequence {
+	return &Sequence{Block: 0x0, Count: getNumBlocks(numElements), Next: nil}
+}
+
+// String returns a string representation of the block sequence starting from this block
+func (s *Sequence) String() string {
+	var nextBlock string
+	if s.Next == nil {
+		nextBlock = "end"
+	} else {
+		nextBlock = s.Next.String()
+	}
+	return fmt.Sprintf("(0x%x, %d)->%s", s.Block, s.Count, nextBlock)
+}
+
+// GetAvailableBit returns the position of the first unset bit in the bitmask represented by this sequence
+func (s *Sequence) GetAvailableBit() (bytePos, bitPos int) {
+	if s.Block == blockMAX || s.Count == 0 {
+		return -1, -1
+	}
+	bits := 0
+	bitSel := uint32(blockFirstBit)
+	for bitSel > 0 && s.Block&bitSel != 0 {
+		bitSel >>= 1
+		bits++
+	}
+	return bits / 8, bits % 8
+}
+
+// GetCopy returns a copy of the linked list rooted at this node
+func (s *Sequence) GetCopy() *Sequence {
+	n := &Sequence{Block: s.Block, Count: s.Count}
+	pn := n
+	ps := s.Next
+	for ps != nil {
+		pn.Next = &Sequence{Block: ps.Block, Count: ps.Count}
+		pn = pn.Next
+		ps = ps.Next
+	}
+	return n
+}
+
+// Equal checks if this sequence is equal to the passed one
+func (s *Sequence) Equal(o *Sequence) bool {
+	this := s
+	other := o
+	for this != nil {
+		if other == nil {
+			return false
+		}
+		if this.Block != other.Block || this.Count != other.Count {
+			return false
+		}
+		this = this.Next
+		other = other.Next
+	}
+	// Check if other is longer than this
+	if other != nil {
+		return false
+	}
+	return true
+}
+
+// ToByteArray converts the sequence into a byte array
+// TODO (aboch): manage network/host order stuff
+func (s *Sequence) ToByteArray() ([]byte, error) {
+	var bb []byte
+
+	p := s
+	for p != nil {
+		bb = append(bb, netutils.U32ToA(p.Block)...)
+		bb = append(bb, netutils.U32ToA(p.Count)...)
+		p = p.Next
+	}
+
+	return bb, nil
+}
+
+// FromByteArray construct the sequence from the byte array
+// TODO (aboch): manage network/host order stuff
+func (s *Sequence) FromByteArray(data []byte) error {
+	l := len(data)
+	if l%8 != 0 {
+		return fmt.Errorf("cannot deserialize byte sequence of lenght %d (%v)", l, data)
+	}
+
+	p := s
+	i := 0
+	for {
+		p.Block = netutils.ATo32(data[i : i+4])
+		p.Count = netutils.ATo32(data[i+4 : i+8])
+		i += 8
+		if i == l {
+			break
+		}
+		p.Next = &Sequence{}
+		p = p.Next
+	}
+
+	return nil
+}
+
+// GetFirstAvailable returns the byte and bit position of the first unset bit
+func (h *Handle) GetFirstAvailable() (int, int, error) {
+	h.Lock()
+	defer h.Unlock()
+	return GetFirstAvailable(h.head)
+}
+
+// CheckIfAvailable checks if the bit correspondent to the specified ordinal is unset
+// If the ordinal is beyond the Sequence limits, a negative response is returned
+func (h *Handle) CheckIfAvailable(ordinal int) (int, int, error) {
+	h.Lock()
+	defer h.Unlock()
+	return CheckIfAvailable(h.head, ordinal)
+}
+
+// PushReservation pushes the bit reservation inside the bitmask.
+func (h *Handle) PushReservation(bytePos, bitPos int, release bool) error {
+	// Create a copy of the current handler
+	h.Lock()
+	nh := &Handle{app: h.app, id: h.id, store: h.store, dbIndex: h.dbIndex, head: h.head.GetCopy()}
+	h.Unlock()
+
+	nh.head = PushReservation(bytePos, bitPos, nh.head, release)
+
+	err := nh.writeToStore()
+	if err == nil {
+		// Commit went through, save locally
+		h.Lock()
+		h.head = nh.head
+		if release {
+			h.unselected++
+		} else {
+			h.unselected--
+		}
+		h.dbIndex = nh.dbIndex
+		h.Unlock()
+	}
+
+	return err
+}
+
+// Destroy removes from the datastore the data belonging to this handle
+func (h *Handle) Destroy() {
+	h.deleteFromStore()
+}
+
+// ToByteArray converts this handle's data into a byte array
+func (h *Handle) ToByteArray() ([]byte, error) {
+	ba := make([]byte, 8)
+
+	h.Lock()
+	defer h.Unlock()
+	copy(ba[0:4], netutils.U32ToA(h.bits))
+	copy(ba[4:8], netutils.U32ToA(h.unselected))
+	bm, err := h.head.ToByteArray()
+	if err != nil {
+		return nil, fmt.Errorf("failed to serialize head: %s", err.Error())
+	}
+	ba = append(ba, bm...)
+
+	return ba, nil
+}
+
+// FromByteArray reads his handle's data from a byte array
+func (h *Handle) FromByteArray(ba []byte) error {
+	if ba == nil {
+		return fmt.Errorf("nil byte array")
+	}
+
+	nh := &Sequence{}
+	err := nh.FromByteArray(ba[8:])
+	if err != nil {
+		return fmt.Errorf("failed to deserialize head: %s", err.Error())
+	}
+
+	h.Lock()
+	h.head = nh
+	h.bits = netutils.ATo32(ba[0:4])
+	h.unselected = netutils.ATo32(ba[4:8])
+	h.Unlock()
+
+	return nil
+}
+
+// Bits returns the length of the bit sequence
+func (h *Handle) Bits() uint32 {
+	return h.bits
+}
+
+// Unselected returns the number of bits which are not selected
+func (h *Handle) Unselected() uint32 {
+	h.Lock()
+	defer h.Unlock()
+	return h.unselected
+}
+
+func (h *Handle) getDBIndex() uint64 {
+	h.Lock()
+	defer h.Unlock()
+	return h.dbIndex
+}
+
+// GetFirstAvailable looks for the first unset bit in passed mask
+func GetFirstAvailable(head *Sequence) (int, int, error) {
+	byteIndex := 0
+	current := head
+	for current != nil {
+		if current.Block != blockMAX {
+			bytePos, bitPos := current.GetAvailableBit()
+			return byteIndex + bytePos, bitPos, nil
+		}
+		byteIndex += int(current.Count * blockBytes)
+		current = current.Next
+	}
+	return -1, -1, fmt.Errorf("no bit available")
+}
+
+// CheckIfAvailable checks if the bit correspondent to the specified ordinal is unset
+// If the ordinal is beyond the Sequence limits, a negative response is returned
+func CheckIfAvailable(head *Sequence, ordinal int) (int, int, error) {
+	bytePos := ordinal / 8
+	bitPos := ordinal % 8
+
+	// Find the Sequence containing this byte
+	current, _, _, inBlockBytePos := findSequence(head, bytePos)
+
+	if current != nil {
+		// Check whether the bit corresponding to the ordinal address is unset
+		bitSel := uint32(blockFirstBit >> uint(inBlockBytePos*8+bitPos))
+		if current.Block&bitSel == 0 {
+			return bytePos, bitPos, nil
+		}
+	}
+
+	return -1, -1, fmt.Errorf("requested bit is not available")
+}
+
+// Given the byte position and the sequences list head, return the pointer to the
+// sequence containing the byte (current), the pointer to the previous sequence,
+// the number of blocks preceding the block containing the byte inside the current sequence.
+// If bytePos is outside of the list, function will return (nil, nil, 0, -1)
+func findSequence(head *Sequence, bytePos int) (*Sequence, *Sequence, uint32, int) {
+	// Find the Sequence containing this byte
+	previous := head
+	current := head
+	n := bytePos
+	for current.Next != nil && n >= int(current.Count*blockBytes) { // Nil check for less than 32 addresses masks
+		n -= int(current.Count * blockBytes)
+		previous = current
+		current = current.Next
+	}
+
+	// If byte is outside of the list, let caller know
+	if n >= int(current.Count*blockBytes) {
+		return nil, nil, 0, -1
+	}
+
+	// Find the byte position inside the block and the number of blocks
+	// preceding the block containing the byte inside this sequence
+	precBlocks := uint32(n / blockBytes)
+	inBlockBytePos := bytePos % blockBytes
+
+	return current, previous, precBlocks, inBlockBytePos
+}
+
+// PushReservation pushes the bit reservation inside the bitmask.
+// Given byte and bit positions, identify the sequence (current) which holds the block containing the affected bit.
+// Create a new block with the modified bit according to the operation (allocate/release).
+// Create a new Sequence containing the new Block and insert it in the proper position.
+// Remove current sequence if empty.
+// Check if new Sequence can be merged with neighbour (previous/Next) sequences.
+//
+//
+// Identify "current" Sequence containing block:
+//                                      [prev seq] [current seq] [Next seq]
+//
+// Based on block position, resulting list of sequences can be any of three forms:
+//
+//        Block position                        Resulting list of sequences
+// A) Block is first in current:         [prev seq] [new] [modified current seq] [Next seq]
+// B) Block is last in current:          [prev seq] [modified current seq] [new] [Next seq]
+// C) Block is in the middle of current: [prev seq] [curr pre] [new] [curr post] [Next seq]
+func PushReservation(bytePos, bitPos int, head *Sequence, release bool) *Sequence {
+	// Store list's head
+	newHead := head
+
+	// Find the Sequence containing this byte
+	current, previous, precBlocks, inBlockBytePos := findSequence(head, bytePos)
+	if current == nil {
+		return newHead
+	}
+
+	// Construct updated block
+	bitSel := uint32(blockFirstBit >> uint(inBlockBytePos*8+bitPos))
+	newBlock := current.Block
+	if release {
+		newBlock &^= bitSel
+	} else {
+		newBlock |= bitSel
+	}
+
+	// Quit if it was a redundant request
+	if current.Block == newBlock {
+		return newHead
+	}
+
+	// Current Sequence inevitably looses one block, upadate Count
+	current.Count--
+
+	// Create new sequence
+	newSequence := &Sequence{Block: newBlock, Count: 1}
+
+	// Insert the new sequence in the list based on block position
+	if precBlocks == 0 { // First in sequence (A)
+		newSequence.Next = current
+		if current == head {
+			newHead = newSequence
+			previous = newHead
+		} else {
+			previous.Next = newSequence
+		}
+		removeCurrentIfEmpty(&newHead, newSequence, current)
+		mergeSequences(previous)
+	} else if precBlocks == current.Count-2 { // Last in sequence (B)
+		newSequence.Next = current.Next
+		current.Next = newSequence
+		mergeSequences(current)
+	} else { // In between the sequence (C)
+		currPre := &Sequence{Block: current.Block, Count: precBlocks, Next: newSequence}
+		currPost := current
+		currPost.Count -= precBlocks
+		newSequence.Next = currPost
+		if currPost == head {
+			newHead = currPre
+		} else {
+			previous.Next = currPre
+		}
+		// No merging or empty current possible here
+	}
+
+	return newHead
+}
+
+// Removes the current sequence from the list if empty, adjusting the head pointer if needed
+func removeCurrentIfEmpty(head **Sequence, previous, current *Sequence) {
+	if current.Count == 0 {
+		if current == *head {
+			*head = current.Next
+		} else {
+			previous.Next = current.Next
+			current = current.Next
+		}
+	}
+}
+
+// Given a pointer to a Sequence, it checks if it can be merged with any following sequences
+// It stops when no more merging is possible.
+// TODO: Optimization: only attempt merge from start to end sequence, no need to scan till the end of the list
+func mergeSequences(seq *Sequence) {
+	if seq != nil {
+		// Merge all what possible from seq
+		for seq.Next != nil && seq.Block == seq.Next.Block {
+			seq.Count += seq.Next.Count
+			seq.Next = seq.Next.Next
+		}
+		// Move to Next
+		mergeSequences(seq.Next)
+	}
+}
+
+func getNumBlocks(numBits uint32) uint32 {
+	numBlocks := numBits / blockLen
+	if numBits%blockLen != 0 {
+		numBlocks++
+	}
+	return numBlocks
+}

vendor/src/github.com/docker/libnetwork/bitseq/store.go

@@ -0,0 +1,122 @@
+package bitseq
+
+import (
+	"encoding/json"
+	"fmt"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/docker/libnetwork/datastore"
+	"github.com/docker/libnetwork/types"
+)
+
+// Key provides the Key to be used in KV Store
+func (h *Handle) Key() []string {
+	h.Lock()
+	defer h.Unlock()
+	return []string{h.app, h.id}
+}
+
+// KeyPrefix returns the immediate parent key that can be used for tree walk
+func (h *Handle) KeyPrefix() []string {
+	h.Lock()
+	defer h.Unlock()
+	return []string{h.app}
+}
+
+// Value marshals the data to be stored in the KV store
+func (h *Handle) Value() []byte {
+	b, err := h.ToByteArray()
+	if err != nil {
+		log.Warnf("Failed to serialize Handle: %v", err)
+		b = []byte{}
+	}
+	jv, err := json.Marshal(b)
+	if err != nil {
+		log.Warnf("Failed to json encode bitseq handler byte array: %v", err)
+		return []byte{}
+	}
+	return jv
+}
+
+// Index returns the latest DB Index as seen by this object
+func (h *Handle) Index() uint64 {
+	h.Lock()
+	defer h.Unlock()
+	return h.dbIndex
+}
+
+// SetIndex method allows the datastore to store the latest DB Index into this object
+func (h *Handle) SetIndex(index uint64) {
+	h.Lock()
+	h.dbIndex = index
+	h.Unlock()
+}
+
+func (h *Handle) watchForChanges() error {
+	h.Lock()
+	store := h.store
+	h.Unlock()
+
+	if store == nil {
+		return nil
+	}
+
+	kvpChan, err := store.KVStore().Watch(datastore.Key(h.Key()...), nil)
+	if err != nil {
+		return err
+	}
+	go func() {
+		for {
+			select {
+			case kvPair := <-kvpChan:
+				// Only process remote update
+				if kvPair != nil && (kvPair.LastIndex != h.getDBIndex()) {
+					err := h.fromDsValue(kvPair.Value)
+					if err != nil {
+						log.Warnf("Failed to reconstruct bitseq handle from ds watch: %s", err.Error())
+					} else {
+						h.Lock()
+						h.dbIndex = kvPair.LastIndex
+						h.Unlock()
+					}
+				}
+			}
+		}
+	}()
+	return nil
+}
+
+func (h *Handle) fromDsValue(value []byte) error {
+	var ba []byte
+	if err := json.Unmarshal(value, &ba); err != nil {
+		return fmt.Errorf("failed to decode json: %s", err.Error())
+	}
+	if err := h.FromByteArray(ba); err != nil {
+		return fmt.Errorf("failed to decode handle: %s", err.Error())
+	}
+	return nil
+}
+
+func (h *Handle) writeToStore() error {
+	h.Lock()
+	store := h.store
+	h.Unlock()
+	if store == nil {
+		return nil
+	}
+	err := store.PutObjectAtomic(h)
+	if err == datastore.ErrKeyModified {
+		return types.RetryErrorf("failed to perform atomic write (%v). retry might fix the error", err)
+	}
+	return err
+}
+
+func (h *Handle) deleteFromStore() error {
+	h.Lock()
+	store := h.store
+	h.Unlock()
+	if store == nil {
+		return nil
+	}
+	return store.DeleteObjectAtomic(h)
+}

vendor/src/github.com/docker/libnetwork/controller.go

@@ -2,51 +2,52 @@
 Package libnetwork provides the basic functionality and extension points to
 create network namespaces and allocate interfaces for containers to use.
 
-        // Create a new controller instance
-        controller, _err := libnetwork.New(nil)
+	// Create a new controller instance
+	controller, _err := libnetwork.New(nil)
 
-        // Select and configure the network driver
-        networkType := "bridge"
+	// Select and configure the network driver
+	networkType := "bridge"
 
-        driverOptions := options.Generic{}
-        genericOption := make(map[string]interface{})
-        genericOption[netlabel.GenericData] = driverOptions
-        err := controller.ConfigureNetworkDriver(networkType, genericOption)
-        if err != nil {
-                return
-        }
+	driverOptions := options.Generic{}
+	genericOption := make(map[string]interface{})
+	genericOption[netlabel.GenericData] = driverOptions
+	err := controller.ConfigureNetworkDriver(networkType, genericOption)
+	if err != nil {
+		return
+	}
 
-        // Create a network for containers to join.
-        // NewNetwork accepts Variadic optional arguments that libnetwork and Drivers can make of
-        network, err := controller.NewNetwork(networkType, "network1")
-        if err != nil {
-                return
-        }
+	// Create a network for containers to join.
+	// NewNetwork accepts Variadic optional arguments that libnetwork and Drivers can make of
+	network, err := controller.NewNetwork(networkType, "network1")
+	if err != nil {
+		return
+	}
 
-        // For each new container: allocate IP and interfaces. The returned network
-        // settings will be used for container infos (inspect and such), as well as
-        // iptables rules for port publishing. This info is contained or accessible
-        // from the returned endpoint.
-        ep, err := network.CreateEndpoint("Endpoint1")
-        if err != nil {
-                return
-        }
+	// For each new container: allocate IP and interfaces. The returned network
+	// settings will be used for container infos (inspect and such), as well as
+	// iptables rules for port publishing. This info is contained or accessible
+	// from the returned endpoint.
+	ep, err := network.CreateEndpoint("Endpoint1")
+	if err != nil {
+		return
+	}
 
-        // A container can join the endpoint by providing the container ID to the join
-        // api.
-        // Join acceps Variadic arguments which will be made use of by libnetwork and Drivers
-        err = ep.Join("container1",
-                libnetwork.JoinOptionHostname("test"),
-                libnetwork.JoinOptionDomainname("docker.io"))
-        if err != nil {
-                return
-        }
+	// A container can join the endpoint by providing the container ID to the join
+	// api.
+	// Join acceps Variadic arguments which will be made use of by libnetwork and Drivers
+	err = ep.Join("container1",
+		libnetwork.JoinOptionHostname("test"),
+		libnetwork.JoinOptionDomainname("docker.io"))
+	if err != nil {
+		return
+	}
 */
 package libnetwork
 
 import (
 	"fmt"
 	"net"
+	"strings"
 	"sync"
 
 	log "github.com/Sirupsen/logrus"
@@ -56,6 +57,7 @@ import (
 	"github.com/docker/libnetwork/datastore"
 	"github.com/docker/libnetwork/driverapi"
 	"github.com/docker/libnetwork/hostdiscovery"
+	"github.com/docker/libnetwork/netlabel"
 	"github.com/docker/libnetwork/sandbox"
 	"github.com/docker/libnetwork/types"
 )
@@ -85,6 +87,9 @@ type NetworkController interface {
 	// NetworkByID returns the Network which has the passed id. If not found, the error ErrNoSuchNetwork is returned.
 	NetworkByID(id string) (Network, error)
 
+	// LeaveAll accepts a container id and attempts to leave all endpoints that the container has joined
+	LeaveAll(id string) error
+
 	// GC triggers immediate garbage collection of resources which are garbage collected.
 	GC()
 }
@@ -187,14 +192,41 @@ func (c *controller) ConfigureNetworkDriver(networkType string, options map[stri
 
 func (c *controller) RegisterDriver(networkType string, driver driverapi.Driver, capability driverapi.Capability) error {
 	c.Lock()
-	defer c.Unlock()
 	if !config.IsValidName(networkType) {
+		c.Unlock()
 		return ErrInvalidName(networkType)
 	}
 	if _, ok := c.drivers[networkType]; ok {
+		c.Unlock()
 		return driverapi.ErrActiveRegistration(networkType)
 	}
 	c.drivers[networkType] = &driverData{driver, capability}
+
+	if c.cfg == nil {
+		c.Unlock()
+		return nil
+	}
+
+	opt := make(map[string]interface{})
+	for _, label := range c.cfg.Daemon.Labels {
+		if strings.HasPrefix(label, netlabel.DriverPrefix+"."+networkType) {
+			opt[netlabel.Key(label)] = netlabel.Value(label)
+		}
+	}
+
+	if capability.Scope == driverapi.GlobalScope && c.validateDatastoreConfig() {
+		opt[netlabel.KVProvider] = c.cfg.Datastore.Client.Provider
+		opt[netlabel.KVProviderURL] = c.cfg.Datastore.Client.Address
+	}
+
+	c.Unlock()
+
+	if len(opt) != 0 {
+		if err := driver.Config(opt); err != nil {
+			return err
+		}
+	}
+
 	return nil
 }
 
@@ -255,6 +287,7 @@ func (c *controller) addNetwork(n *network) error {
 	}
 
 	n.Lock()
+	n.svcRecords = svcMap{}
 	n.driver = dd.driver
 	d := n.driver
 	n.Unlock()
@@ -263,6 +296,9 @@ func (c *controller) addNetwork(n *network) error {
 	if err := d.CreateNetwork(n.id, n.generic); err != nil {
 		return err
 	}
+	if err := n.watchEndpoints(); err != nil {
+		return err
+	}
 	c.Lock()
 	c.networks[n.id] = n
 	c.Unlock()

vendor/src/github.com/docker/libnetwork/datastore/datastore.go

@@ -15,6 +15,8 @@ import (
 type DataStore interface {
 	// GetObject gets data from datastore and unmarshals to the specified object
 	GetObject(key string, o interface{}) error
+	// GetUpdatedObject gets data from datastore along with its index and unmarshals to the specified object
+	GetUpdatedObject(key string, o interface{}) (uint64, error)
 	// PutObject adds a new Record based on an object into the datastore
 	PutObject(kvObject KV) error
 	// PutObjectAtomic provides an atomic add and update operation for a Record
@@ -30,7 +32,10 @@ type DataStore interface {
 }
 
 // ErrKeyModified is raised for an atomic update when the update is working on a stale state
-var ErrKeyModified = store.ErrKeyModified
+var (
+	ErrKeyModified = store.ErrKeyModified
+	ErrKeyNotFound = store.ErrKeyNotFound
+)
 
 type datastore struct {
 	store store.Store
@@ -152,6 +157,18 @@ func (ds *datastore) GetObject(key string, o interface{}) error {
 	return json.Unmarshal(kvPair.Value, o)
 }
 
+// GetUpdateObject returns a record matching the key
+func (ds *datastore) GetUpdatedObject(key string, o interface{}) (uint64, error) {
+	kvPair, err := ds.store.Get(key)
+	if err != nil {
+		return 0, err
+	}
+	if err := json.Unmarshal(kvPair.Value, o); err != nil {
+		return 0, err
+	}
+	return kvPair.LastIndex, nil
+}
+
 // DeleteObject unconditionally deletes a record from the store
 func (ds *datastore) DeleteObject(kvObject KV) error {
 	return ds.store.Delete(Key(kvObject.Key()...))

vendor/src/github.com/docker/libnetwork/drivers/bridge/bridge.go

@@ -10,6 +10,7 @@ import (
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/libnetwork/driverapi"
 	"github.com/docker/libnetwork/ipallocator"
+	"github.com/docker/libnetwork/iptables"
 	"github.com/docker/libnetwork/netlabel"
 	"github.com/docker/libnetwork/netutils"
 	"github.com/docker/libnetwork/options"
@@ -110,6 +111,10 @@ func Init(dc driverapi.DriverCallback) error {
 	if out, err := exec.Command("modprobe", "-va", "bridge", "nf_nat", "br_netfilter").Output(); err != nil {
 		logrus.Warnf("Running modprobe bridge nf_nat failed with message: %s, error: %v", out, err)
 	}
+	if err := iptables.RemoveExistingChain(DockerChain, iptables.Nat); err != nil {
+		logrus.Warnf("Failed to remove existing iptables entries in %s : %v", DockerChain, err)
+	}
+
 	c := driverapi.Capability{
 		Scope: driverapi.LocalScope,
 	}

vendor/src/github.com/docker/libnetwork/drivers/overlay/joinleave.go

@@ -0,0 +1,99 @@
+package overlay
+
+import (
+	"fmt"
+
+	"github.com/docker/libnetwork/driverapi"
+	"github.com/docker/libnetwork/types"
+	"github.com/vishvananda/netlink"
+)
+
+// Join method is invoked when a Sandbox is attached to an endpoint.
+func (d *driver) Join(nid, eid types.UUID, sboxKey string, jinfo driverapi.JoinInfo, options map[string]interface{}) error {
+	if err := validateID(nid, eid); err != nil {
+		return err
+	}
+
+	n := d.network(nid)
+	if n == nil {
+		return fmt.Errorf("could not find network with id %s", nid)
+	}
+
+	ep := n.endpoint(eid)
+	if ep == nil {
+		return fmt.Errorf("could not find endpoint with id %s", eid)
+	}
+
+	if err := n.joinSandbox(); err != nil {
+		return fmt.Errorf("network sandbox join failed: %v",
+			err)
+	}
+
+	sbox := n.sandbox()
+
+	name1, name2, err := createVethPair()
+	if err != nil {
+		return err
+	}
+
+	if err := sbox.AddInterface(name1, "veth",
+		sbox.InterfaceOptions().Master("bridge1")); err != nil {
+		return fmt.Errorf("could not add veth pair inside the network sandbox: %v", err)
+	}
+
+	veth, err := netlink.LinkByName(name2)
+	if err != nil {
+		return fmt.Errorf("could not find link by name %s: %v", name2, err)
+	}
+
+	if err := netlink.LinkSetHardwareAddr(veth, ep.mac); err != nil {
+		return fmt.Errorf("could not set mac address to the container interface: %v", err)
+	}
+
+	for _, iNames := range jinfo.InterfaceNames() {
+		// Make sure to set names on the correct interface ID.
+		if iNames.ID() == 1 {
+			err = iNames.SetNames(name2, "eth")
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	err = jinfo.SetGateway(bridgeIP.IP)
+	if err != nil {
+		return err
+	}
+
+	d.peerDbAdd(nid, eid, ep.addr.IP, ep.mac,
+		d.serfInstance.LocalMember().Addr, true)
+	d.notifyCh <- ovNotify{
+		action: "join",
+		nid:    nid,
+		eid:    eid,
+	}
+
+	return nil
+}
+
+// Leave method is invoked when a Sandbox detaches from an endpoint.
+func (d *driver) Leave(nid, eid types.UUID) error {
+	if err := validateID(nid, eid); err != nil {
+		return err
+	}
+
+	n := d.network(nid)
+	if n == nil {
+		return fmt.Errorf("could not find network with id %s", nid)
+	}
+
+	d.notifyCh <- ovNotify{
+		action: "leave",
+		nid:    nid,
+		eid:    eid,
+	}
+
+	n.leaveSandbox()
+
+	return nil
+}

vendor/src/github.com/docker/libnetwork/drivers/overlay/ov_endpoint.go

@@ -0,0 +1,110 @@
+package overlay
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+
+	"github.com/docker/libnetwork/driverapi"
+	"github.com/docker/libnetwork/netutils"
+	"github.com/docker/libnetwork/types"
+)
+
+type endpointTable map[types.UUID]*endpoint
+
+type endpoint struct {
+	id   types.UUID
+	mac  net.HardwareAddr
+	addr *net.IPNet
+}
+
+func (n *network) endpoint(eid types.UUID) *endpoint {
+	n.Lock()
+	defer n.Unlock()
+
+	return n.endpoints[eid]
+}
+
+func (n *network) addEndpoint(ep *endpoint) {
+	n.Lock()
+	n.endpoints[ep.id] = ep
+	n.Unlock()
+}
+
+func (n *network) deleteEndpoint(eid types.UUID) {
+	n.Lock()
+	delete(n.endpoints, eid)
+	n.Unlock()
+}
+
+func (d *driver) CreateEndpoint(nid, eid types.UUID, epInfo driverapi.EndpointInfo,
+	epOptions map[string]interface{}) error {
+	if err := validateID(nid, eid); err != nil {
+		return err
+	}
+
+	n := d.network(nid)
+	if n == nil {
+		return fmt.Errorf("network id %q not found", nid)
+	}
+
+	ep := &endpoint{
+		id: eid,
+	}
+
+	if epInfo != nil && (len(epInfo.Interfaces()) > 0) {
+		addr := epInfo.Interfaces()[0].Address()
+		ep.addr = &addr
+		ep.mac = epInfo.Interfaces()[0].MacAddress()
+		n.addEndpoint(ep)
+		return nil
+	}
+
+	ipID, err := d.ipAllocator.GetID()
+	if err != nil {
+		return fmt.Errorf("could not allocate ip from subnet %s: %v",
+			bridgeSubnet.String(), err)
+	}
+
+	ep.addr = &net.IPNet{
+		Mask: bridgeSubnet.Mask,
+	}
+	ep.addr.IP = make([]byte, 4)
+
+	binary.BigEndian.PutUint32(ep.addr.IP, bridgeSubnetInt+ipID)
+
+	ep.mac = netutils.GenerateRandomMAC()
+
+	err = epInfo.AddInterface(1, ep.mac, *ep.addr, net.IPNet{})
+	if err != nil {
+		return fmt.Errorf("could not add interface to endpoint info: %v", err)
+	}
+
+	n.addEndpoint(ep)
+
+	return nil
+}
+
+func (d *driver) DeleteEndpoint(nid, eid types.UUID) error {
+	if err := validateID(nid, eid); err != nil {
+		return err
+	}
+
+	n := d.network(nid)
+	if n == nil {
+		return fmt.Errorf("network id %q not found", nid)
+	}
+
+	ep := n.endpoint(eid)
+	if ep == nil {
+		return fmt.Errorf("endpoint id %q not found", eid)
+	}
+
+	d.ipAllocator.Release(binary.BigEndian.Uint32(ep.addr.IP) - bridgeSubnetInt)
+	n.deleteEndpoint(eid)
+	return nil
+}
+
+func (d *driver) EndpointOperInfo(nid, eid types.UUID) (map[string]interface{}, error) {
+	return make(map[string]interface{}, 0), nil
+}

vendor/src/github.com/docker/libnetwork/drivers/overlay/ov_network.go

@@ -0,0 +1,325 @@
+package overlay
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"sync"
+	"syscall"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/docker/libnetwork/datastore"
+	"github.com/docker/libnetwork/ipallocator"
+	"github.com/docker/libnetwork/sandbox"
+	"github.com/docker/libnetwork/types"
+	"github.com/vishvananda/netlink"
+	"github.com/vishvananda/netlink/nl"
+)
+
+type networkTable map[types.UUID]*network
+
+type network struct {
+	id          types.UUID
+	vni         uint32
+	dbIndex     uint64
+	sbox        sandbox.Sandbox
+	endpoints   endpointTable
+	ipAllocator *ipallocator.IPAllocator
+	gw          net.IP
+	vxlanName   string
+	driver      *driver
+	joinCnt     int
+	sync.Mutex
+}
+
+func (d *driver) CreateNetwork(id types.UUID, option map[string]interface{}) error {
+	if id == "" {
+		return fmt.Errorf("invalid network id")
+	}
+
+	n := &network{
+		id:        id,
+		driver:    d,
+		endpoints: endpointTable{},
+	}
+
+	n.gw = bridgeIP.IP
+
+	d.addNetwork(n)
+
+	if err := n.obtainVxlanID(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (d *driver) DeleteNetwork(nid types.UUID) error {
+	if nid == "" {
+		return fmt.Errorf("invalid network id")
+	}
+
+	n := d.network(nid)
+	if n == nil {
+		return fmt.Errorf("could not find network with id %s", nid)
+	}
+
+	d.deleteNetwork(nid)
+
+	return n.releaseVxlanID()
+}
+
+func (n *network) joinSandbox() error {
+	n.Lock()
+	if n.joinCnt != 0 {
+		n.joinCnt++
+		n.Unlock()
+		return nil
+	}
+	n.joinCnt++
+	n.Unlock()
+
+	return n.initSandbox()
+}
+
+func (n *network) leaveSandbox() {
+	n.Lock()
+	n.joinCnt--
+	if n.joinCnt != 0 {
+		n.Unlock()
+		return
+	}
+	n.Unlock()
+
+	n.destroySandbox()
+}
+
+func (n *network) destroySandbox() {
+	sbox := n.sandbox()
+	if sbox != nil {
+		for _, iface := range sbox.Info().Interfaces() {
+			iface.Remove()
+		}
+
+		if err := deleteVxlan(n.vxlanName); err != nil {
+			logrus.Warnf("could not cleanup sandbox properly: %v", err)
+		}
+
+		sbox.Destroy()
+	}
+}
+
+func (n *network) initSandbox() error {
+	sbox, err := sandbox.NewSandbox(sandbox.GenerateKey(string(n.id)), true)
+	if err != nil {
+		return fmt.Errorf("could not create network sandbox: %v", err)
+	}
+
+	// Add a bridge inside the namespace
+	if err := sbox.AddInterface("bridge1", "br",
+		sbox.InterfaceOptions().Address(bridgeIP),
+		sbox.InterfaceOptions().Bridge(true)); err != nil {
+		return fmt.Errorf("could not create bridge inside the network sandbox: %v", err)
+	}
+
+	vxlanName, err := createVxlan(n.vxlanID())
+	if err != nil {
+		return err
+	}
+
+	if err := sbox.AddInterface(vxlanName, "vxlan",
+		sbox.InterfaceOptions().Master("bridge1")); err != nil {
+		return fmt.Errorf("could not add vxlan interface inside the network sandbox: %v",
+			err)
+	}
+
+	n.vxlanName = vxlanName
+
+	n.setSandbox(sbox)
+
+	n.driver.peerDbUpdateSandbox(n.id)
+
+	var nlSock *nl.NetlinkSocket
+	sbox.InvokeFunc(func() {
+		nlSock, err = nl.Subscribe(syscall.NETLINK_ROUTE, syscall.RTNLGRP_NEIGH)
+		if err != nil {
+			err = fmt.Errorf("failed to subscribe to neighbor group netlink messages")
+		}
+	})
+
+	go n.watchMiss(nlSock)
+
+	return nil
+}
+
+func (n *network) watchMiss(nlSock *nl.NetlinkSocket) {
+	for {
+		msgs, err := nlSock.Recieve()
+		if err != nil {
+			logrus.Errorf("Failed to receive from netlink: %v ", err)
+			continue
+		}
+
+		for _, msg := range msgs {
+			if msg.Header.Type != syscall.RTM_GETNEIGH && msg.Header.Type != syscall.RTM_NEWNEIGH {
+				continue
+			}
+
+			neigh, err := netlink.NeighDeserialize(msg.Data)
+			if err != nil {
+				logrus.Errorf("Failed to deserialize netlink ndmsg: %v", err)
+				continue
+			}
+
+			if neigh.IP.To16() != nil {
+				continue
+			}
+
+			if neigh.State&(netlink.NUD_STALE|netlink.NUD_INCOMPLETE) == 0 {
+				continue
+			}
+
+			mac, vtep, err := n.driver.resolvePeer(n.id, neigh.IP)
+			if err != nil {
+				logrus.Errorf("could not resolve peer %q: %v", neigh.IP, err)
+				continue
+			}
+
+			if err := n.driver.peerAdd(n.id, types.UUID("dummy"), neigh.IP, mac, vtep, true); err != nil {
+				logrus.Errorf("could not add neighbor entry for missed peer: %v", err)
+			}
+		}
+	}
+}
+
+func (d *driver) addNetwork(n *network) {
+	d.Lock()
+	d.networks[n.id] = n
+	d.Unlock()
+}
+
+func (d *driver) deleteNetwork(nid types.UUID) {
+	d.Lock()
+	delete(d.networks, nid)
+	d.Unlock()
+}
+
+func (d *driver) network(nid types.UUID) *network {
+	d.Lock()
+	defer d.Unlock()
+
+	return d.networks[nid]
+}
+
+func (n *network) sandbox() sandbox.Sandbox {
+	n.Lock()
+	defer n.Unlock()
+
+	return n.sbox
+}
+
+func (n *network) setSandbox(sbox sandbox.Sandbox) {
+	n.Lock()
+	n.sbox = sbox
+	n.Unlock()
+}
+
+func (n *network) vxlanID() uint32 {
+	n.Lock()
+	defer n.Unlock()
+
+	return n.vni
+}
+
+func (n *network) setVxlanID(vni uint32) {
+	n.Lock()
+	n.vni = vni
+	n.Unlock()
+}
+
+func (n *network) Key() []string {
+	return []string{"overlay", "network", string(n.id)}
+}
+
+func (n *network) KeyPrefix() []string {
+	return []string{"overlay", "network"}
+}
+
+func (n *network) Value() []byte {
+	b, err := json.Marshal(n.vxlanID())
+	if err != nil {
+		return []byte{}
+	}
+
+	return b
+}
+
+func (n *network) Index() uint64 {
+	return n.dbIndex
+}
+
+func (n *network) SetIndex(index uint64) {
+	n.dbIndex = index
+}
+
+func (n *network) writeToStore() error {
+	return n.driver.store.PutObjectAtomic(n)
+}
+
+func (n *network) releaseVxlanID() error {
+	if n.driver.store == nil {
+		return fmt.Errorf("no datastore configured. cannot release vxlan id")
+	}
+
+	if n.vxlanID() == 0 {
+		return nil
+	}
+
+	if err := n.driver.store.DeleteObjectAtomic(n); err != nil {
+		if err == datastore.ErrKeyModified || err == datastore.ErrKeyNotFound {
+			// In both the above cases we can safely assume that the key has been removed by some other
+			// instance and so simply get out of here
+			return nil
+		}
+
+		return fmt.Errorf("failed to delete network to vxlan id map: %v", err)
+	}
+
+	n.driver.vxlanIdm.Release(n.vxlanID())
+	n.setVxlanID(0)
+	return nil
+}
+
+func (n *network) obtainVxlanID() error {
+	if n.driver.store == nil {
+		return fmt.Errorf("no datastore configured. cannot obtain vxlan id")
+	}
+
+	for {
+		var vxlanID uint32
+		if err := n.driver.store.GetObject(datastore.Key(n.Key()...),
+			&vxlanID); err != nil {
+			if err == datastore.ErrKeyNotFound {
+				vxlanID, err = n.driver.vxlanIdm.GetID()
+				if err != nil {
+					return fmt.Errorf("failed to allocate vxlan id: %v", err)
+				}
+
+				n.setVxlanID(vxlanID)
+				if err := n.writeToStore(); err != nil {
+					n.driver.vxlanIdm.Release(n.vxlanID())
+					n.setVxlanID(0)
+					if err == datastore.ErrKeyModified {
+						continue
+					}
+					return fmt.Errorf("failed to update data store with vxlan id: %v", err)
+				}
+				return nil
+			}
+			return fmt.Errorf("failed to obtain vxlan id from data store: %v", err)
+		}
+
+		n.setVxlanID(vxlanID)
+		return nil
+	}
+}

vendor/src/github.com/docker/libnetwork/drivers/overlay/ov_serf.go

@@ -0,0 +1,249 @@
+package overlay
+
+import (
+	"fmt"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/docker/libnetwork/types"
+	"github.com/hashicorp/serf/serf"
+)
+
+type ovNotify struct {
+	action string
+	eid    types.UUID
+	nid    types.UUID
+}
+
+type logWriter struct{}
+
+func (l *logWriter) Write(p []byte) (int, error) {
+	str := string(p)
+
+	switch {
+	case strings.Contains(str, "[WARN]"):
+		logrus.Warn(str)
+	case strings.Contains(str, "[DEBUG]"):
+		logrus.Debug(str)
+	case strings.Contains(str, "[INFO]"):
+		logrus.Info(str)
+	case strings.Contains(str, "[ERR]"):
+		logrus.Error(str)
+	}
+
+	return len(p), nil
+}
+
+func getBindAddr(ifaceName string) (string, error) {
+	iface, err := net.InterfaceByName(ifaceName)
+	if err != nil {
+		return "", fmt.Errorf("failed to find interface %s: %v", ifaceName, err)
+	}
+
+	addrs, err := iface.Addrs()
+	if err != nil {
+		return "", fmt.Errorf("failed to get interface addresses: %v", err)
+	}
+
+	for _, a := range addrs {
+		addr, ok := a.(*net.IPNet)
+		if !ok {
+			continue
+		}
+		addrIP := addr.IP
+
+		if addrIP.IsLinkLocalUnicast() {
+			continue
+		}
+
+		return addrIP.String(), nil
+	}
+
+	return "", fmt.Errorf("failed to get bind address")
+}
+
+func (d *driver) serfInit() error {
+	var err error
+
+	config := serf.DefaultConfig()
+	config.Init()
+	if d.ifaceName != "" {
+		bindAddr, err := getBindAddr(d.ifaceName)
+		if err != nil {
+			return fmt.Errorf("getBindAddr error: %v", err)
+		}
+		config.MemberlistConfig.BindAddr = bindAddr
+	}
+
+	d.eventCh = make(chan serf.Event, 4)
+	config.EventCh = d.eventCh
+	config.UserCoalescePeriod = 1 * time.Second
+	config.UserQuiescentPeriod = 50 * time.Millisecond
+
+	config.LogOutput = logrus.StandardLogger().Out
+
+	s, err := serf.Create(config)
+	if err != nil {
+		return fmt.Errorf("failed to create cluster node: %v", err)
+	}
+	defer func() {
+		if err != nil {
+			s.Shutdown()
+		}
+	}()
+
+	if d.neighIP != "" {
+		if _, err = s.Join([]string{d.neighIP}, false); err != nil {
+			return fmt.Errorf("Failed to join the cluster at neigh IP %s: %v",
+				d.neighIP, err)
+		}
+	}
+
+	d.serfInstance = s
+
+	d.notifyCh = make(chan ovNotify)
+	d.exitCh = make(chan chan struct{})
+
+	go d.startSerfLoop(d.eventCh, d.notifyCh, d.exitCh)
+	return nil
+}
+
+func (d *driver) notifyEvent(event ovNotify) {
+	n := d.network(event.nid)
+	ep := n.endpoint(event.eid)
+
+	ePayload := fmt.Sprintf("%s %s %s", event.action, ep.addr.IP.String(), ep.mac.String())
+	eName := fmt.Sprintf("jl %s %s %s", d.serfInstance.LocalMember().Addr.String(),
+		event.nid, event.eid)
+
+	if err := d.serfInstance.UserEvent(eName, []byte(ePayload), true); err != nil {
+		fmt.Printf("Sending user event failed: %v\n", err)
+	}
+}
+
+func (d *driver) processEvent(u serf.UserEvent) {
+	fmt.Printf("Received user event name:%s, payload:%s\n", u.Name,
+		string(u.Payload))
+
+	var dummy, action, vtepStr, nid, eid, ipStr, macStr string
+	if _, err := fmt.Sscan(u.Name, &dummy, &vtepStr, &nid, &eid); err != nil {
+		fmt.Printf("Failed to scan name string: %v\n", err)
+	}
+
+	if _, err := fmt.Sscan(string(u.Payload), &action,
+		&ipStr, &macStr); err != nil {
+		fmt.Printf("Failed to scan value string: %v\n", err)
+	}
+
+	fmt.Printf("Parsed data = %s/%s/%s/%s/%s\n", nid, eid, vtepStr, ipStr, macStr)
+
+	mac, err := net.ParseMAC(macStr)
+	if err != nil {
+		fmt.Printf("Failed to parse mac: %v\n", err)
+	}
+
+	if d.serfInstance.LocalMember().Addr.String() == vtepStr {
+		return
+	}
+
+	switch action {
+	case "join":
+		if err := d.peerAdd(types.UUID(nid), types.UUID(eid), net.ParseIP(ipStr), mac,
+			net.ParseIP(vtepStr), true); err != nil {
+			fmt.Printf("Peer add failed in the driver: %v\n", err)
+		}
+	case "leave":
+		if err := d.peerDelete(types.UUID(nid), types.UUID(eid), net.ParseIP(ipStr), mac,
+			net.ParseIP(vtepStr), true); err != nil {
+			fmt.Printf("Peer delete failed in the driver: %v\n", err)
+		}
+	}
+}
+
+func (d *driver) processQuery(q *serf.Query) {
+	fmt.Printf("Received query name:%s, payload:%s\n", q.Name,
+		string(q.Payload))
+
+	var nid, ipStr string
+	if _, err := fmt.Sscan(string(q.Payload), &nid, &ipStr); err != nil {
+		fmt.Printf("Failed to scan query payload string: %v\n", err)
+	}
+
+	peerMac, vtep, err := d.peerDbSearch(types.UUID(nid), net.ParseIP(ipStr))
+	if err != nil {
+		return
+	}
+
+	q.Respond([]byte(fmt.Sprintf("%s %s", peerMac.String(), vtep.String())))
+}
+
+func (d *driver) resolvePeer(nid types.UUID, peerIP net.IP) (net.HardwareAddr, net.IP, error) {
+	qPayload := fmt.Sprintf("%s %s", string(nid), peerIP.String())
+	resp, err := d.serfInstance.Query("peerlookup", []byte(qPayload), nil)
+	if err != nil {
+		return nil, nil, fmt.Errorf("resolving peer by querying the cluster failed: %v", err)
+	}
+
+	respCh := resp.ResponseCh()
+	select {
+	case r := <-respCh:
+		var macStr, vtepStr string
+		if _, err := fmt.Sscan(string(r.Payload), &macStr, &vtepStr); err != nil {
+			return nil, nil, fmt.Errorf("bad response %q for the resolve query: %v", string(r.Payload), err)
+		}
+
+		mac, err := net.ParseMAC(macStr)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to parse mac: %v", err)
+		}
+
+		return mac, net.ParseIP(vtepStr), nil
+
+	case <-time.After(time.Second):
+		return nil, nil, fmt.Errorf("timed out resolving peer by querying the cluster")
+	}
+}
+
+func (d *driver) startSerfLoop(eventCh chan serf.Event, notifyCh chan ovNotify,
+	exitCh chan chan struct{}) {
+
+	for {
+		select {
+		case notify, ok := <-notifyCh:
+			if !ok {
+				break
+			}
+
+			d.notifyEvent(notify)
+		case ch, ok := <-exitCh:
+			if !ok {
+				break
+			}
+
+			if err := d.serfInstance.Leave(); err != nil {
+				fmt.Printf("failed leaving the cluster: %v\n", err)
+			}
+
+			d.serfInstance.Shutdown()
+			close(ch)
+			return
+		case e, ok := <-eventCh:
+			if !ok {
+				break
+			}
+
+			if e.EventType() == serf.EventQuery {
+				d.processQuery(e.(*serf.Query))
+				break
+			}
+
+			u, ok := e.(serf.UserEvent)
+			if !ok {
+				break
+			}
+			d.processEvent(u)
+		}
+	}
+}

vendor/src/github.com/docker/libnetwork/drivers/overlay/ov_utils.go

@@ -0,0 +1,80 @@
+package overlay
+
+import (
+	"fmt"
+
+	"github.com/docker/libnetwork/netutils"
+	"github.com/docker/libnetwork/types"
+	"github.com/vishvananda/netlink"
+)
+
+func validateID(nid, eid types.UUID) error {
+	if nid == "" {
+		return fmt.Errorf("invalid network id")
+	}
+
+	if eid == "" {
+		return fmt.Errorf("invalid endpoint id")
+	}
+
+	return nil
+}
+
+func createVethPair() (string, string, error) {
+	// Generate a name for what will be the host side pipe interface
+	name1, err := netutils.GenerateIfaceName(vethPrefix, vethLen)
+	if err != nil {
+		return "", "", fmt.Errorf("error generating veth name1: %v", err)
+	}
+
+	// Generate a name for what will be the sandbox side pipe interface
+	name2, err := netutils.GenerateIfaceName(vethPrefix, vethLen)
+	if err != nil {
+		return "", "", fmt.Errorf("error generating veth name2: %v", err)
+	}
+
+	// Generate and add the interface pipe host <-> sandbox
+	veth := &netlink.Veth{
+		LinkAttrs: netlink.LinkAttrs{Name: name1, TxQLen: 0},
+		PeerName:  name2}
+	if err := netlink.LinkAdd(veth); err != nil {
+		return "", "", fmt.Errorf("error creating veth pair: %v", err)
+	}
+
+	return name1, name2, nil
+}
+
+func createVxlan(vni uint32) (string, error) {
+	name, err := netutils.GenerateIfaceName("vxlan", 7)
+	if err != nil {
+		return "", fmt.Errorf("error generating vxlan name: %v", err)
+	}
+
+	vxlan := &netlink.Vxlan{
+		LinkAttrs: netlink.LinkAttrs{Name: name},
+		VxlanId:   int(vni),
+		Learning:  true,
+		Proxy:     true,
+		L3miss:    true,
+		L2miss:    true,
+	}
+
+	if err := netlink.LinkAdd(vxlan); err != nil {
+		return "", fmt.Errorf("error creating vxlan interface: %v", err)
+	}
+
+	return name, nil
+}
+
+func deleteVxlan(name string) error {
+	link, err := netlink.LinkByName(name)
+	if err != nil {
+		return fmt.Errorf("failed to find vxlan interface with name %s: %v", name, err)
+	}
+
+	if err := netlink.LinkDel(link); err != nil {
+		return fmt.Errorf("error deleting vxlan interface: %v", err)
+	}
+
+	return nil
+}

vendor/src/github.com/docker/libnetwork/drivers/overlay/overlay.go

@@ -0,0 +1,157 @@
+package overlay
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+	"sync"
+
+	"github.com/docker/libnetwork/config"
+	"github.com/docker/libnetwork/datastore"
+	"github.com/docker/libnetwork/driverapi"
+	"github.com/docker/libnetwork/idm"
+	"github.com/docker/libnetwork/netlabel"
+	"github.com/docker/libnetwork/types"
+	"github.com/hashicorp/serf/serf"
+)
+
+const (
+	networkType  = "overlay"
+	vethPrefix   = "veth"
+	vethLen      = 7
+	vxlanIDStart = 256
+	vxlanIDEnd   = 1000
+)
+
+type driver struct {
+	eventCh      chan serf.Event
+	notifyCh     chan ovNotify
+	exitCh       chan chan struct{}
+	ifaceName    string
+	neighIP      string
+	peerDb       peerNetworkMap
+	serfInstance *serf.Serf
+	networks     networkTable
+	store        datastore.DataStore
+	ipAllocator  *idm.Idm
+	vxlanIdm     *idm.Idm
+	sync.Once
+	sync.Mutex
+}
+
+var (
+	bridgeSubnet, bridgeIP *net.IPNet
+	once                   sync.Once
+	bridgeSubnetInt        uint32
+)
+
+func onceInit() {
+	var err error
+	_, bridgeSubnet, err = net.ParseCIDR("172.21.0.0/16")
+	if err != nil {
+		panic("could not parse cid 172.21.0.0/16")
+	}
+
+	bridgeSubnetInt = binary.BigEndian.Uint32(bridgeSubnet.IP.To4())
+
+	ip, subnet, err := net.ParseCIDR("172.21.255.254/16")
+	if err != nil {
+		panic("could not parse cid 172.21.255.254/16")
+	}
+
+	bridgeIP = &net.IPNet{
+		IP:   ip,
+		Mask: subnet.Mask,
+	}
+}
+
+// Init registers a new instance of overlay driver
+func Init(dc driverapi.DriverCallback) error {
+	once.Do(onceInit)
+
+	c := driverapi.Capability{
+		Scope: driverapi.GlobalScope,
+	}
+
+	return dc.RegisterDriver(networkType, &driver{
+		networks: networkTable{},
+		peerDb: peerNetworkMap{
+			mp: map[types.UUID]peerMap{},
+		},
+	}, c)
+}
+
+// Fini cleans up the driver resources
+func Fini(drv driverapi.Driver) {
+	d := drv.(*driver)
+
+	if d.exitCh != nil {
+		waitCh := make(chan struct{})
+
+		d.exitCh <- waitCh
+
+		<-waitCh
+	}
+}
+
+func (d *driver) Config(option map[string]interface{}) error {
+	var onceDone bool
+	var err error
+
+	d.Do(func() {
+		onceDone = true
+
+		if ifaceName, ok := option[netlabel.OverlayBindInterface]; ok {
+			d.ifaceName = ifaceName.(string)
+		}
+
+		if neighIP, ok := option[netlabel.OverlayNeighborIP]; ok {
+			d.neighIP = neighIP.(string)
+		}
+
+		provider, provOk := option[netlabel.KVProvider]
+		provURL, urlOk := option[netlabel.KVProviderURL]
+
+		if provOk && urlOk {
+			cfg := &config.DatastoreCfg{
+				Client: config.DatastoreClientCfg{
+					Provider: provider.(string),
+					Address:  provURL.(string),
+				},
+			}
+			d.store, err = datastore.NewDataStore(cfg)
+			if err != nil {
+				err = fmt.Errorf("failed to initialize data store: %v", err)
+				return
+			}
+		}
+
+		d.vxlanIdm, err = idm.New(d.store, "vxlan-id", vxlanIDStart, vxlanIDEnd)
+		if err != nil {
+			err = fmt.Errorf("failed to initialize vxlan id manager: %v", err)
+			return
+		}
+
+		d.ipAllocator, err = idm.New(d.store, "ipam-id", 1, 0xFFFF-2)
+		if err != nil {
+			err = fmt.Errorf("failed to initalize ipam id manager: %v", err)
+			return
+		}
+
+		err = d.serfInit()
+		if err != nil {
+			err = fmt.Errorf("initializing serf instance failed: %v", err)
+		}
+
+	})
+
+	if !onceDone {
+		return fmt.Errorf("config already applied to driver")
+	}
+
+	return err
+}
+
+func (d *driver) Type() string {
+	return networkType
+}

vendor/src/github.com/docker/libnetwork/drivers/overlay/peerdb.go

@@ -0,0 +1,280 @@
+package overlay
+
+import (
+	"fmt"
+	"net"
+	"sync"
+	"syscall"
+
+	"github.com/docker/libnetwork/types"
+)
+
+type peerKey struct {
+	peerIP  net.IP
+	peerMac net.HardwareAddr
+}
+
+type peerEntry struct {
+	eid       types.UUID
+	vtep      net.IP
+	inSandbox bool
+	isLocal   bool
+}
+
+type peerMap struct {
+	mp map[string]peerEntry
+	sync.Mutex
+}
+
+type peerNetworkMap struct {
+	mp map[types.UUID]peerMap
+	sync.Mutex
+}
+
+func (pKey peerKey) String() string {
+	return fmt.Sprintf("%s %s", pKey.peerIP, pKey.peerMac)
+}
+
+func (pKey *peerKey) Scan(state fmt.ScanState, verb rune) error {
+	ipB, err := state.Token(true, nil)
+	if err != nil {
+		return err
+	}
+
+	pKey.peerIP = net.ParseIP(string(ipB))
+
+	macB, err := state.Token(true, nil)
+	if err != nil {
+		return err
+	}
+
+	pKey.peerMac, err = net.ParseMAC(string(macB))
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+var peerDbWg sync.WaitGroup
+
+func (d *driver) peerDbWalk(nid types.UUID, f func(*peerKey, *peerEntry) bool) error {
+	d.peerDb.Lock()
+	pMap, ok := d.peerDb.mp[nid]
+	if !ok {
+		d.peerDb.Unlock()
+		return nil
+	}
+	d.peerDb.Unlock()
+
+	pMap.Lock()
+	for pKeyStr, pEntry := range pMap.mp {
+		var pKey peerKey
+		if _, err := fmt.Sscan(pKeyStr, &pKey); err != nil {
+			fmt.Printf("peer key scan failed: %v", err)
+		}
+
+		if f(&pKey, &pEntry) {
+			pMap.Unlock()
+			return nil
+		}
+	}
+	pMap.Unlock()
+
+	return nil
+}
+
+func (d *driver) peerDbSearch(nid types.UUID, peerIP net.IP) (net.HardwareAddr, net.IP, error) {
+	var (
+		peerMac net.HardwareAddr
+		vtep    net.IP
+		found   bool
+	)
+
+	err := d.peerDbWalk(nid, func(pKey *peerKey, pEntry *peerEntry) bool {
+		if pKey.peerIP.Equal(peerIP) {
+			peerMac = pKey.peerMac
+			vtep = pEntry.vtep
+			found = true
+			return found
+		}
+
+		return found
+	})
+
+	if err != nil {
+		return nil, nil, fmt.Errorf("peerdb search for peer ip %q failed: %v", peerIP, err)
+	}
+
+	if !found {
+		return nil, nil, fmt.Errorf("peer ip %q not found in peerdb", peerIP)
+	}
+
+	return peerMac, vtep, nil
+}
+
+func (d *driver) peerDbAdd(nid, eid types.UUID, peerIP net.IP,
+	peerMac net.HardwareAddr, vtep net.IP, isLocal bool) {
+
+	peerDbWg.Wait()
+
+	d.peerDb.Lock()
+	pMap, ok := d.peerDb.mp[nid]
+	if !ok {
+		d.peerDb.mp[nid] = peerMap{
+			mp: make(map[string]peerEntry),
+		}
+
+		pMap = d.peerDb.mp[nid]
+	}
+	d.peerDb.Unlock()
+
+	pKey := peerKey{
+		peerIP:  peerIP,
+		peerMac: peerMac,
+	}
+
+	pEntry := peerEntry{
+		eid:     eid,
+		vtep:    vtep,
+		isLocal: isLocal,
+	}
+
+	pMap.Lock()
+	pMap.mp[pKey.String()] = pEntry
+	pMap.Unlock()
+}
+
+func (d *driver) peerDbDelete(nid, eid types.UUID, peerIP net.IP,
+	peerMac net.HardwareAddr, vtep net.IP) {
+	peerDbWg.Wait()
+
+	d.peerDb.Lock()
+	pMap, ok := d.peerDb.mp[nid]
+	if !ok {
+		d.peerDb.Unlock()
+		return
+	}
+	d.peerDb.Unlock()
+
+	pKey := peerKey{
+		peerIP:  peerIP,
+		peerMac: peerMac,
+	}
+
+	pMap.Lock()
+	delete(pMap.mp, pKey.String())
+	pMap.Unlock()
+}
+
+func (d *driver) peerDbUpdateSandbox(nid types.UUID) {
+	d.peerDb.Lock()
+	pMap, ok := d.peerDb.mp[nid]
+	if !ok {
+		d.peerDb.Unlock()
+		return
+	}
+	d.peerDb.Unlock()
+
+	peerDbWg.Add(1)
+
+	var peerOps []func()
+	pMap.Lock()
+	for pKeyStr, pEntry := range pMap.mp {
+		var pKey peerKey
+		if _, err := fmt.Sscan(pKeyStr, &pKey); err != nil {
+			fmt.Printf("peer key scan failed: %v", err)
+		}
+
+		if pEntry.isLocal {
+			continue
+		}
+
+		op := func() {
+			if err := d.peerAdd(nid, pEntry.eid, pKey.peerIP,
+				pKey.peerMac, pEntry.vtep,
+				false); err != nil {
+				fmt.Printf("peerdbupdate in sandbox failed for ip %s and mac %s: %v",
+					pKey.peerIP, pKey.peerMac, err)
+			}
+		}
+
+		peerOps = append(peerOps, op)
+	}
+	pMap.Unlock()
+
+	for _, op := range peerOps {
+		op()
+	}
+
+	peerDbWg.Done()
+}
+
+func (d *driver) peerAdd(nid, eid types.UUID, peerIP net.IP,
+	peerMac net.HardwareAddr, vtep net.IP, updateDb bool) error {
+
+	if err := validateID(nid, eid); err != nil {
+		return err
+	}
+
+	if updateDb {
+		d.peerDbAdd(nid, eid, peerIP, peerMac, vtep, false)
+	}
+
+	n := d.network(nid)
+	if n == nil {
+		return nil
+	}
+
+	sbox := n.sandbox()
+	if sbox == nil {
+		return nil
+	}
+
+	// Add neighbor entry for the peer IP
+	if err := sbox.AddNeighbor(peerIP, peerMac, sbox.NeighborOptions().LinkName(n.vxlanName)); err != nil {
+		return fmt.Errorf("could not add neigbor entry into the sandbox: %v", err)
+	}
+
+	// Add fdb entry to the bridge for the peer mac
+	if err := sbox.AddNeighbor(vtep, peerMac, sbox.NeighborOptions().LinkName(n.vxlanName),
+		sbox.NeighborOptions().Family(syscall.AF_BRIDGE)); err != nil {
+		return fmt.Errorf("could not add fdb entry into the sandbox: %v", err)
+	}
+
+	return nil
+}
+
+func (d *driver) peerDelete(nid, eid types.UUID, peerIP net.IP,
+	peerMac net.HardwareAddr, vtep net.IP, updateDb bool) error {
+
+	if err := validateID(nid, eid); err != nil {
+		return err
+	}
+
+	if updateDb {
+		d.peerDbDelete(nid, eid, peerIP, peerMac, vtep)
+	}
+
+	n := d.network(nid)
+	if n == nil {
+		return nil
+	}
+
+	sbox := n.sandbox()
+	if sbox == nil {
+		return nil
+	}
+
+	// Delete fdb entry to the bridge for the peer mac
+	if err := sbox.DeleteNeighbor(vtep, peerMac); err != nil {
+		return fmt.Errorf("could not delete fdb entry into the sandbox: %v", err)
+	}
+
+	// Delete neighbor entry for the peer IP
+	if err := sbox.DeleteNeighbor(peerIP, peerMac); err != nil {
+		return fmt.Errorf("could not delete neigbor entry into the sandbox: %v", err)
+	}
+
+	return nil
+}

vendor/src/github.com/docker/libnetwork/drivers_linux.go

@@ -5,6 +5,7 @@ import (
 	"github.com/docker/libnetwork/drivers/bridge"
 	"github.com/docker/libnetwork/drivers/host"
 	"github.com/docker/libnetwork/drivers/null"
+	o "github.com/docker/libnetwork/drivers/overlay"
 	"github.com/docker/libnetwork/drivers/remote"
 )
 
@@ -14,6 +15,7 @@ func initDrivers(dc driverapi.DriverCallback) error {
 		host.Init,
 		null.Init,
 		remote.Init,
+		o.Init,
 	} {
 		if err := fn(dc); err != nil {
 			return err

vendor/src/github.com/docker/libnetwork/endpoint.go

@@ -349,11 +349,6 @@ func (ep *endpoint) Join(containerID string, options ...EndpointOption) error {
 	ep.joinLeaveStart()
 	defer func() {
 		ep.joinLeaveEnd()
-		if err != nil {
-			if e := ep.Leave(containerID, options...); e != nil {
-				log.Warnf("couldnt leave endpoint : %v", ep.name, err)
-			}
-		}
 	}()
 
 	ep.Lock()
@@ -403,6 +398,13 @@ func (ep *endpoint) Join(containerID string, options ...EndpointOption) error {
 	if err != nil {
 		return err
 	}
+	defer func() {
+		if err != nil {
+			if err = driver.Leave(nid, epid); err != nil {
+				log.Warnf("driver leave failed while rolling back join: %v", err)
+			}
+		}
+	}()
 
 	err = ep.buildHostsFiles()
 	if err != nil {
@@ -421,7 +423,7 @@ func (ep *endpoint) Join(containerID string, options ...EndpointOption) error {
 
 	sb, err := ctrlr.sandboxAdd(sboxKey, !container.config.useDefaultSandBox, ep)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed sandbox add: %v", err)
 	}
 	defer func() {
 		if err != nil {
@@ -554,7 +556,7 @@ func (ep *endpoint) deleteEndpoint() error {
 	_, ok := n.endpoints[epid]
 	if !ok {
 		n.Unlock()
-		return &UnknownEndpointError{name: name, id: string(epid)}
+		return nil
 	}
 
 	nid := n.id
@@ -571,9 +573,39 @@ func (ep *endpoint) deleteEndpoint() error {
 		}
 		log.Warnf("driver error deleting endpoint %s : %v", name, err)
 	}
+
+	n.updateSvcRecord(ep, false)
 	return nil
 }
 
+func (ep *endpoint) addHostEntries(recs []etchosts.Record) {
+	ep.Lock()
+	container := ep.container
+	ep.Unlock()
+
+	if container == nil {
+		return
+	}
+
+	if err := etchosts.Add(container.config.hostsPath, recs); err != nil {
+		log.Warnf("Failed adding service host entries to the running container: %v", err)
+	}
+}
+
+func (ep *endpoint) deleteHostEntries(recs []etchosts.Record) {
+	ep.Lock()
+	container := ep.container
+	ep.Unlock()
+
+	if container == nil {
+		return
+	}
+
+	if err := etchosts.Delete(container.config.hostsPath, recs); err != nil {
+		log.Warnf("Failed deleting service host entries to the running container: %v", err)
+	}
+}
+
 func (ep *endpoint) buildHostsFiles() error {
 	var extraContent []etchosts.Record
 
@@ -581,6 +613,7 @@ func (ep *endpoint) buildHostsFiles() error {
 	container := ep.container
 	joinInfo := ep.joinInfo
 	ifaces := ep.iFaces
+	n := ep.network
 	ep.Unlock()
 
 	if container == nil {
@@ -613,6 +646,8 @@ func (ep *endpoint) buildHostsFiles() error {
 			etchosts.Record{Hosts: extraHost.name, IP: extraHost.IP})
 	}
 
+	extraContent = append(extraContent, n.getSvcRecords()...)
+
 	IP := ""
 	if len(ifaces) != 0 && ifaces[0] != nil {
 		IP = ifaces[0].addr.IP.String()

vendor/src/github.com/docker/libnetwork/endpoint_info.go

@@ -84,13 +84,15 @@ func (epi *endpointInterface) UnmarshalJSON(b []byte) (err error) {
 	mac, _ := net.ParseMAC(epMap["mac"].(string))
 	epi.mac = mac
 
-	_, ipnet, _ := net.ParseCIDR(epMap["addr"].(string))
+	ip, ipnet, _ := net.ParseCIDR(epMap["addr"].(string))
 	if ipnet != nil {
+		ipnet.IP = ip
 		epi.addr = *ipnet
 	}
 
-	_, ipnet, _ = net.ParseCIDR(epMap["addrv6"].(string))
+	ip, ipnet, _ = net.ParseCIDR(epMap["addrv6"].(string))
 	if ipnet != nil {
+		ipnet.IP = ip
 		epi.addrv6 = *ipnet
 	}
 
@@ -102,8 +104,9 @@ func (epi *endpointInterface) UnmarshalJSON(b []byte) (err error) {
 	json.Unmarshal(rb, &routes)
 	epi.routes = make([]*net.IPNet, 0)
 	for _, route := range routes {
-		_, ipr, err := net.ParseCIDR(route)
+		ip, ipr, err := net.ParseCIDR(route)
 		if err == nil {
+			ipr.IP = ip
 			epi.routes = append(epi.routes, ipr)
 		}
 	}

vendor/src/github.com/docker/libnetwork/error.go

@@ -51,7 +51,7 @@ func (ij ErrInvalidJoin) BadRequest() {}
 type ErrNoContainer struct{}
 
 func (nc ErrNoContainer) Error() string {
-	return "a container has already joined the endpoint"
+	return "no container is attached to the endpoint"
 }
 
 // Maskable denotes the type of this error

vendor/src/github.com/docker/libnetwork/etchosts/etchosts.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"os"
 	"regexp"
 )
 
@@ -65,6 +66,45 @@ func Build(path, IP, hostname, domainname string, extraContent []Record) error {
 	return ioutil.WriteFile(path, content.Bytes(), 0644)
 }
 
+// Add adds an arbitrary number of Records to an already existing /etc/hosts file
+func Add(path string, recs []Record) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+
+	content := bytes.NewBuffer(nil)
+
+	_, err = content.ReadFrom(f)
+	if err != nil {
+		return err
+	}
+
+	for _, r := range recs {
+		if _, err := r.WriteTo(content); err != nil {
+			return err
+		}
+	}
+
+	return ioutil.WriteFile(path, content.Bytes(), 0644)
+}
+
+// Delete deletes an arbitrary number of Records already existing in /etc/hosts file
+func Delete(path string, recs []Record) error {
+	old, err := ioutil.ReadFile(path)
+	if err != nil {
+		return err
+	}
+
+	regexpStr := fmt.Sprintf("\\S*\\t%s\\n", regexp.QuoteMeta(recs[0].Hosts))
+	for _, r := range recs[1:] {
+		regexpStr = regexpStr + "|" + fmt.Sprintf("\\S*\\t%s\\n", regexp.QuoteMeta(r.Hosts))
+	}
+
+	var re = regexp.MustCompile(regexpStr)
+	return ioutil.WriteFile(path, re.ReplaceAll(old, []byte("")), 0644)
+}
+
 // Update all IP addresses where hostname matches.
 // path is path to host file
 // IP is new IP address

vendor/src/github.com/docker/libnetwork/idm/idm.go

@@ -0,0 +1,94 @@
+// Package idm manages resevation/release of numerical ids from a configured set of contiguos ids
+package idm
+
+import (
+	"fmt"
+
+	"github.com/docker/libnetwork/bitseq"
+	"github.com/docker/libnetwork/datastore"
+	"github.com/docker/libnetwork/types"
+)
+
+// Idm manages the reservation/release of numerical ids from a contiguos set
+type Idm struct {
+	start  uint32
+	end    uint32
+	handle *bitseq.Handle
+}
+
+// New returns an instance of id manager for a set of [start-end] numerical ids
+func New(ds datastore.DataStore, id string, start, end uint32) (*Idm, error) {
+	if id == "" {
+		return nil, fmt.Errorf("Invalid id")
+	}
+	if end <= start {
+		return nil, fmt.Errorf("Invalid set range: [%d, %d]", start, end)
+	}
+
+	h, err := bitseq.NewHandle("idm", ds, id, uint32(1+end-start))
+	if err != nil {
+		return nil, fmt.Errorf("failed to initialize bit sequence handler: %s", err.Error())
+	}
+
+	return &Idm{start: start, end: end, handle: h}, nil
+}
+
+// GetID returns the first available id in the set
+func (i *Idm) GetID() (uint32, error) {
+	if i.handle == nil {
+		return 0, fmt.Errorf("ID set is not initialized")
+	}
+
+	for {
+		bytePos, bitPos, err := i.handle.GetFirstAvailable()
+		if err != nil {
+			return 0, fmt.Errorf("no available ids")
+		}
+		id := i.start + uint32(bitPos+bytePos*8)
+
+		// for sets which length is non multiple of 32 this check is needed
+		if i.end < id {
+			return 0, fmt.Errorf("no available ids")
+		}
+
+		if err := i.handle.PushReservation(bytePos, bitPos, false); err != nil {
+			if _, ok := err.(types.RetryError); !ok {
+				return 0, fmt.Errorf("internal failure while reserving the id: %s", err.Error())
+			}
+			continue
+		}
+
+		return id, nil
+	}
+}
+
+// GetSpecificID tries to reserve the specified id
+func (i *Idm) GetSpecificID(id uint32) error {
+	if i.handle == nil {
+		return fmt.Errorf("ID set is not initialized")
+	}
+
+	if id < i.start || id > i.end {
+		return fmt.Errorf("Requested id does not belong to the set")
+	}
+
+	for {
+		bytePos, bitPos, err := i.handle.CheckIfAvailable(int(id - i.start))
+		if err != nil {
+			return fmt.Errorf("requested id is not available")
+		}
+		if err := i.handle.PushReservation(bytePos, bitPos, false); err != nil {
+			if _, ok := err.(types.RetryError); !ok {
+				return fmt.Errorf("internal failure while reserving the id: %s", err.Error())
+			}
+			continue
+		}
+		return nil
+	}
+}
+
+// Release releases the specified id
+func (i *Idm) Release(id uint32) {
+	ordinal := id - i.start
+	i.handle.PushReservation(int(ordinal/8), int(ordinal%8), true)
+}

vendor/src/github.com/docker/libnetwork/iptables/iptables.go

@@ -99,7 +99,8 @@ func NewChain(name, bridge string, table Table, hairpinMode bool) (*Chain, error
 	case Nat:
 		preroute := []string{
 			"-m", "addrtype",
-			"--dst-type", "LOCAL"}
+			"--dst-type", "LOCAL",
+			"-j", c.Name}
 		if !Exists(Nat, "PREROUTING", preroute...) {
 			if err := c.Prerouting(Append, preroute...); err != nil {
 				return nil, fmt.Errorf("Failed to inject docker in PREROUTING chain: %s", err)
@@ -107,7 +108,8 @@ func NewChain(name, bridge string, table Table, hairpinMode bool) (*Chain, error
 		}
 		output := []string{
 			"-m", "addrtype",
-			"--dst-type", "LOCAL"}
+			"--dst-type", "LOCAL",
+			"-j", c.Name}
 		if !hairpinMode {
 			output = append(output, "!", "--dst", "127.0.0.0/8")
 		}
@@ -228,7 +230,7 @@ func (c *Chain) Prerouting(action Action, args ...string) error {
 	if len(args) > 0 {
 		a = append(a, args...)
 	}
-	if output, err := Raw(append(a, "-j", c.Name)...); err != nil {
+	if output, err := Raw(a...); err != nil {
 		return err
 	} else if len(output) != 0 {
 		return ChainError{Chain: "PREROUTING", Output: output}
@@ -242,7 +244,7 @@ func (c *Chain) Output(action Action, args ...string) error {
 	if len(args) > 0 {
 		a = append(a, args...)
 	}
-	if output, err := Raw(append(a, "-j", c.Name)...); err != nil {
+	if output, err := Raw(a...); err != nil {
 		return err
 	} else if len(output) != 0 {
 		return ChainError{Chain: "OUTPUT", Output: output}
@@ -254,9 +256,9 @@ func (c *Chain) Output(action Action, args ...string) error {
 func (c *Chain) Remove() error {
 	// Ignore errors - This could mean the chains were never set up
 	if c.Table == Nat {
-		c.Prerouting(Delete, "-m", "addrtype", "--dst-type", "LOCAL")
-		c.Output(Delete, "-m", "addrtype", "--dst-type", "LOCAL", "!", "--dst", "127.0.0.0/8")
-		c.Output(Delete, "-m", "addrtype", "--dst-type", "LOCAL") // Created in versions <= 0.1.6
+		c.Prerouting(Delete, "-m", "addrtype", "--dst-type", "LOCAL", "-j", c.Name)
+		c.Output(Delete, "-m", "addrtype", "--dst-type", "LOCAL", "!", "--dst", "127.0.0.0/8", "-j", c.Name)
+		c.Output(Delete, "-m", "addrtype", "--dst-type", "LOCAL", "-j", c.Name) // Created in versions <= 0.1.6
 
 		c.Prerouting(Delete)
 		c.Output(Delete)

vendor/src/github.com/docker/libnetwork/netlabel/labels.go

@@ -1,5 +1,7 @@
 package netlabel
 
+import "strings"
+
 const (
 	// Prefix constant marks the reserved label space for libnetwork
 	Prefix = "com.docker.network"
@@ -21,4 +23,30 @@ const (
 
 	//EnableIPv6 constant represents enabling IPV6 at network level
 	EnableIPv6 = Prefix + ".enable_ipv6"
+
+	// KVProvider constant represents the KV provider backend
+	KVProvider = DriverPrefix + ".kv_provider"
+
+	// KVProviderURL constant represents the KV provider URL
+	KVProviderURL = DriverPrefix + ".kv_provider_url"
+
+	// OverlayBindInterface constant represents overlay driver bind interface
+	OverlayBindInterface = DriverPrefix + ".overlay.bind_interface"
+
+	// OverlayNeighborIP constant represents overlay driver neighbor IP
+	OverlayNeighborIP = DriverPrefix + ".overlay.neighbor_ip"
 )
+
+// Key extracts the key portion of the label
+func Key(label string) string {
+	kv := strings.SplitN(label, "=", 2)
+
+	return kv[0]
+}
+
+// Value extracts the value portion of the label
+func Value(label string) string {
+	kv := strings.SplitN(label, "=", 2)
+
+	return kv[1]
+}

vendor/src/github.com/docker/libnetwork/netutils/utils.go

@@ -168,3 +168,53 @@ func GenerateIfaceName(prefix string, len int) (string, error) {
 	}
 	return "", types.InternalErrorf("could not generate interface name")
 }
+
+func byteArrayToInt(array []byte, numBytes int) uint64 {
+	if numBytes <= 0 || numBytes > 8 {
+		panic("Invalid argument")
+	}
+	num := 0
+	for i := 0; i <= len(array)-1; i++ {
+		num += int(array[len(array)-1-i]) << uint(i*8)
+	}
+	return uint64(num)
+}
+
+// ATo64 converts a byte array into a uint32
+func ATo64(array []byte) uint64 {
+	return byteArrayToInt(array, 8)
+}
+
+// ATo32 converts a byte array into a uint32
+func ATo32(array []byte) uint32 {
+	return uint32(byteArrayToInt(array, 4))
+}
+
+// ATo16 converts a byte array into a uint16
+func ATo16(array []byte) uint16 {
+	return uint16(byteArrayToInt(array, 2))
+}
+
+func intToByteArray(val uint64, numBytes int) []byte {
+	array := make([]byte, numBytes)
+	for i := numBytes - 1; i >= 0; i-- {
+		array[i] = byte(val & 0xff)
+		val = val >> 8
+	}
+	return array
+}
+
+// U64ToA converts a uint64 to a byte array
+func U64ToA(val uint64) []byte {
+	return intToByteArray(uint64(val), 8)
+}
+
+// U32ToA converts a uint64 to a byte array
+func U32ToA(val uint32) []byte {
+	return intToByteArray(uint64(val), 4)
+}
+
+// U16ToA converts a uint64 to a byte array
+func U16ToA(val uint16) []byte {
+	return intToByteArray(uint64(val), 2)
+}

vendor/src/github.com/docker/libnetwork/network.go

@@ -2,6 +2,7 @@ package libnetwork
 
 import (
 	"encoding/json"
+	"net"
 	"sync"
 
 	log "github.com/Sirupsen/logrus"
@@ -9,6 +10,7 @@ import (
 	"github.com/docker/libnetwork/config"
 	"github.com/docker/libnetwork/datastore"
 	"github.com/docker/libnetwork/driverapi"
+	"github.com/docker/libnetwork/etchosts"
 	"github.com/docker/libnetwork/netlabel"
 	"github.com/docker/libnetwork/options"
 	"github.com/docker/libnetwork/types"
@@ -51,6 +53,8 @@ type Network interface {
 // When the function returns true, the walk will stop.
 type EndpointWalker func(ep Endpoint) bool
 
+type svcMap map[string]net.IP
+
 type network struct {
 	ctrlr       *controller
 	name        string
@@ -62,6 +66,8 @@ type network struct {
 	endpoints   endpointTable
 	generic     options.Generic
 	dbIndex     uint64
+	svcRecords  svcMap
+	stopWatchCh chan struct{}
 	sync.Mutex
 }
 
@@ -248,6 +254,7 @@ func (n *network) deleteNetwork() error {
 		}
 		log.Warnf("driver error deleting network %s : %v", n.name, err)
 	}
+	n.stopWatch()
 	return nil
 }
 
@@ -270,6 +277,8 @@ func (n *network) addEndpoint(ep *endpoint) error {
 	if err != nil {
 		return err
 	}
+
+	n.updateSvcRecord(ep, true)
 	return nil
 }
 
@@ -382,3 +391,62 @@ func (n *network) isGlobalScoped() (bool, error) {
 	n.Unlock()
 	return c.isDriverGlobalScoped(n.networkType)
 }
+
+func (n *network) updateSvcRecord(ep *endpoint, isAdd bool) {
+	n.Lock()
+	var recs []etchosts.Record
+	for _, iface := range ep.InterfaceList() {
+		if isAdd {
+			n.svcRecords[ep.Name()] = iface.Address().IP
+			n.svcRecords[ep.Name()+"."+n.name] = iface.Address().IP
+		} else {
+			delete(n.svcRecords, ep.Name())
+			delete(n.svcRecords, ep.Name()+"."+n.name)
+		}
+
+		recs = append(recs, etchosts.Record{
+			Hosts: ep.Name(),
+			IP:    iface.Address().IP.String(),
+		})
+
+		recs = append(recs, etchosts.Record{
+			Hosts: ep.Name() + "." + n.name,
+			IP:    iface.Address().IP.String(),
+		})
+	}
+	n.Unlock()
+
+	var epList []*endpoint
+	n.WalkEndpoints(func(e Endpoint) bool {
+		cEp := e.(*endpoint)
+		cEp.Lock()
+		if cEp.container != nil {
+			epList = append(epList, cEp)
+		}
+		cEp.Unlock()
+		return false
+	})
+
+	for _, cEp := range epList {
+		if isAdd {
+			cEp.addHostEntries(recs)
+		} else {
+			cEp.deleteHostEntries(recs)
+		}
+	}
+}
+
+func (n *network) getSvcRecords() []etchosts.Record {
+	n.Lock()
+	defer n.Unlock()
+
+	var recs []etchosts.Record
+	for h, ip := range n.svcRecords {
+		recs = append(recs, etchosts.Record{
+			Hosts: h,
+			IP:    ip.String(),
+		})
+	}
+
+	return recs
+}

vendor/src/github.com/docker/libnetwork/sandbox/interface_linux.go

@@ -153,14 +153,14 @@ func (i *nwIface) Remove() error {
 	})
 }
 
-func (n *networkNamespace) findDstMaster(srcName string) string {
+func (n *networkNamespace) findDst(srcName string, isBridge bool) string {
 	n.Lock()
 	defer n.Unlock()
 
 	for _, i := range n.iFaces {
 		// The master should match the srcname of the interface and the
-		// master interface should be of type bridge.
-		if i.SrcName() == srcName && i.Bridge() {
+		// master interface should be of type bridge, if searching for a bridge type
+		if i.SrcName() == srcName && (!isBridge || i.Bridge()) {
 			return i.DstName()
 		}
 	}
@@ -173,7 +173,7 @@ func (n *networkNamespace) AddInterface(srcName, dstPrefix string, options ...If
 	i.processInterfaceOptions(options...)
 
 	if i.master != "" {
-		i.dstMaster = n.findDstMaster(i.master)
+		i.dstMaster = n.findDst(i.master, true)
 		if i.dstMaster == "" {
 			return fmt.Errorf("could not find an appropriate master %q for %q",
 				i.master, i.srcName)

vendor/src/github.com/docker/libnetwork/sandbox/namespace_linux.go

@@ -37,6 +37,7 @@ type networkNamespace struct {
 	gw           net.IP
 	gwv6         net.IP
 	staticRoutes []*types.StaticRoute
+	neighbors    []*neigh
 	nextIfIndex  int
 	sync.Mutex
 }
@@ -150,6 +151,10 @@ func (n *networkNamespace) InterfaceOptions() IfaceOptionSetter {
 	return n
 }
 
+func (n *networkNamespace) NeighborOptions() NeighborOptionSetter {
+	return n
+}
+
 func reexecCreateNamespace() {
 	if len(os.Args) < 2 {
 		log.Fatal("no namespace path provided")
@@ -230,6 +235,13 @@ func loopbackUp() error {
 	return netlink.LinkSetUp(iface)
 }
 
+func (n *networkNamespace) InvokeFunc(f func()) error {
+	return nsInvoke(n.nsPath(), func(nsFD int) error { return nil }, func(callerFD int) error {
+		f()
+		return nil
+	})
+}
+
 func nsInvoke(path string, prefunc func(nsFD int) error, postfunc func(callerFD int) error) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()

vendor/src/github.com/docker/libnetwork/sandbox/neigh_linux.go

@@ -0,0 +1,138 @@
+package sandbox
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+
+	"github.com/vishvananda/netlink"
+)
+
+// NeighOption is a function option type to set interface options
+type NeighOption func(nh *neigh)
+
+type neigh struct {
+	dstIP    net.IP
+	dstMac   net.HardwareAddr
+	linkName string
+	linkDst  string
+	family   int
+}
+
+func (n *networkNamespace) findNeighbor(dstIP net.IP, dstMac net.HardwareAddr) *neigh {
+	n.Lock()
+	defer n.Unlock()
+
+	for _, nh := range n.neighbors {
+		if nh.dstIP.Equal(dstIP) && bytes.Equal(nh.dstMac, dstMac) {
+			return nh
+		}
+	}
+
+	return nil
+}
+
+func (n *networkNamespace) DeleteNeighbor(dstIP net.IP, dstMac net.HardwareAddr) error {
+	nh := n.findNeighbor(dstIP, dstMac)
+	if nh == nil {
+		return fmt.Errorf("could not find the neighbor entry to delete")
+	}
+
+	return nsInvoke(n.nsPath(), func(nsFD int) error { return nil }, func(callerFD int) error {
+		var iface netlink.Link
+
+		if nh.linkDst != "" {
+			var err error
+			iface, err = netlink.LinkByName(nh.linkDst)
+			if err != nil {
+				return fmt.Errorf("could not find interface with destination name %s: %v",
+					nh.linkDst, err)
+			}
+		}
+
+		nlnh := &netlink.Neigh{
+			IP:     dstIP,
+			State:  netlink.NUD_PERMANENT,
+			Family: nh.family,
+		}
+
+		if nlnh.Family > 0 {
+			nlnh.HardwareAddr = dstMac
+			nlnh.Flags = netlink.NTF_SELF
+		}
+
+		if nh.linkDst != "" {
+			nlnh.LinkIndex = iface.Attrs().Index
+		}
+
+		if err := netlink.NeighDel(nlnh); err != nil {
+			return fmt.Errorf("could not delete neighbor entry: %v", err)
+		}
+
+		for i, nh := range n.neighbors {
+			if nh.dstIP.Equal(dstIP) && bytes.Equal(nh.dstMac, dstMac) {
+				n.neighbors = append(n.neighbors[:i], n.neighbors[i+1:]...)
+			}
+		}
+
+		return nil
+	})
+}
+
+func (n *networkNamespace) AddNeighbor(dstIP net.IP, dstMac net.HardwareAddr, options ...NeighOption) error {
+	nh := n.findNeighbor(dstIP, dstMac)
+	if nh != nil {
+		// If it exists silently return
+		return nil
+	}
+
+	nh = &neigh{
+		dstIP:  dstIP,
+		dstMac: dstMac,
+	}
+
+	nh.processNeighOptions(options...)
+
+	if nh.linkName != "" {
+		nh.linkDst = n.findDst(nh.linkName, false)
+		if nh.linkDst == "" {
+			return fmt.Errorf("could not find the interface with name %s", nh.linkName)
+		}
+	}
+
+	return nsInvoke(n.nsPath(), func(nsFD int) error { return nil }, func(callerFD int) error {
+		var iface netlink.Link
+
+		if nh.linkDst != "" {
+			var err error
+			iface, err = netlink.LinkByName(nh.linkDst)
+			if err != nil {
+				return fmt.Errorf("could not find interface with destination name %s: %v",
+					nh.linkDst, err)
+			}
+		}
+
+		nlnh := &netlink.Neigh{
+			IP:           dstIP,
+			HardwareAddr: dstMac,
+			State:        netlink.NUD_PERMANENT,
+			Family:       nh.family,
+		}
+
+		if nlnh.Family > 0 {
+			nlnh.Flags = netlink.NTF_SELF
+		}
+
+		if nh.linkDst != "" {
+			nlnh.LinkIndex = iface.Attrs().Index
+		}
+
+		if err := netlink.NeighSet(nlnh); err != nil {
+			return fmt.Errorf("could not add neighbor entry: %v", err)
+		}
+
+		n.neighbors = append(n.neighbors, nh)
+
+		return nil
+	})
+}

vendor/src/github.com/docker/libnetwork/sandbox/neigh_windows.go

@@ -0,0 +1,4 @@
+package sandbox
+
+// NeighOption is a function option type to set neighbor options
+type NeighOption func()

vendor/src/github.com/docker/libnetwork/sandbox/options_linux.go

@@ -2,6 +2,26 @@ package sandbox
 
 import "net"
 
+func (nh *neigh) processNeighOptions(options ...NeighOption) {
+	for _, opt := range options {
+		if opt != nil {
+			opt(nh)
+		}
+	}
+}
+
+func (n *networkNamespace) LinkName(name string) NeighOption {
+	return func(nh *neigh) {
+		nh.linkName = name
+	}
+}
+
+func (n *networkNamespace) Family(family int) NeighOption {
+	return func(nh *neigh) {
+		nh.family = family
+	}
+}
+
 func (i *nwIface) processInterfaceOptions(options ...IfaceOption) {
 	for _, opt := range options {
 		if opt != nil {

vendor/src/github.com/docker/libnetwork/sandbox/route_linux.go

@@ -81,7 +81,7 @@ func programGateway(path string, gw net.IP, isAdd bool) error {
 	return nsInvoke(path, func(nsFD int) error { return nil }, func(callerFD int) error {
 		gwRoutes, err := netlink.RouteGet(gw)
 		if err != nil {
-			return fmt.Errorf("route for the gateway could not be found: %v", err)
+			return fmt.Errorf("route for the gateway %s could not be found: %v", gw, err)
 		}
 
 		if isAdd {
@@ -105,7 +105,7 @@ func programRoute(path string, dest *net.IPNet, nh net.IP) error {
 	return nsInvoke(path, func(nsFD int) error { return nil }, func(callerFD int) error {
 		gwRoutes, err := netlink.RouteGet(nh)
 		if err != nil {
-			return fmt.Errorf("route for the next hop could not be found: %v", err)
+			return fmt.Errorf("route for the next hop %s could not be found: %v", nh, err)
 		}
 
 		return netlink.RouteAdd(&netlink.Route{

vendor/src/github.com/docker/libnetwork/sandbox/sandbox.go

@@ -37,9 +37,21 @@ type Sandbox interface {
 	// Remove a static route from the sandbox.
 	RemoveStaticRoute(*types.StaticRoute) error
 
+	// AddNeighbor adds a neighbor entry into the sandbox.
+	AddNeighbor(dstIP net.IP, dstMac net.HardwareAddr, option ...NeighOption) error
+
+	// DeleteNeighbor deletes neighbor entry from the sandbox.
+	DeleteNeighbor(dstIP net.IP, dstMac net.HardwareAddr) error
+
+	// Returns an interface with methods to set neighbor options.
+	NeighborOptions() NeighborOptionSetter
+
 	// Returns an interface with methods to set interface options.
 	InterfaceOptions() IfaceOptionSetter
 
+	//Invoke
+	InvokeFunc(func()) error
+
 	// Returns an interface with methods to get sandbox state.
 	Info() Info
 
@@ -47,6 +59,17 @@ type Sandbox interface {
 	Destroy() error
 }
 
+// NeighborOptionSetter interfaces defines the option setter methods for interface options
+type NeighborOptionSetter interface {
+	// LinkName returns an option setter to set the srcName of the link that should
+	// be used in the neighbor entry
+	LinkName(string) NeighOption
+
+	// Family returns an option setter to set the address family for the neighbor
+	// entry. eg. AF_BRIDGE
+	Family(int) NeighOption
+}
+
 // IfaceOptionSetter interface defines the option setter methods for interface options.
 type IfaceOptionSetter interface {
 	// Bridge returns an option setter to set if the interface is a bridge.

vendor/src/github.com/docker/libnetwork/sandboxdata.go

@@ -2,6 +2,7 @@ package libnetwork
 
 import (
 	"container/heap"
+	"fmt"
 	"sync"
 
 	"github.com/Sirupsen/logrus"
@@ -48,13 +49,9 @@ func (eh *epHeap) Pop() interface{} {
 
 func (s *sandboxData) updateGateway(ep *endpoint) error {
 	sb := s.sandbox()
-	if err := sb.UnsetGateway(); err != nil {
-		return err
-	}
 
-	if err := sb.UnsetGatewayIPv6(); err != nil {
-		return err
-	}
+	sb.UnsetGateway()
+	sb.UnsetGatewayIPv6()
 
 	if ep == nil {
 		return nil
@@ -65,11 +62,11 @@ func (s *sandboxData) updateGateway(ep *endpoint) error {
 	ep.Unlock()
 
 	if err := sb.SetGateway(joinInfo.gw); err != nil {
-		return err
+		return fmt.Errorf("failed to set gateway while updating gateway: %v", err)
 	}
 
 	if err := sb.SetGatewayIPv6(joinInfo.gw6); err != nil {
-		return err
+		return fmt.Errorf("failed to set IPv6 gateway while updating gateway: %v", err)
 	}
 
 	return nil
@@ -93,7 +90,7 @@ func (s *sandboxData) addEndpoint(ep *endpoint) error {
 		}
 
 		if err := sb.AddInterface(i.srcName, i.dstPrefix, ifaceOptions...); err != nil {
-			return err
+			return fmt.Errorf("failed to add interface %s to sandbox: %v", i.srcName, err)
 		}
 	}
 
@@ -101,7 +98,7 @@ func (s *sandboxData) addEndpoint(ep *endpoint) error {
 		// Set up non-interface routes.
 		for _, r := range ep.joinInfo.StaticRoutes {
 			if err := sb.AddStaticRoute(r); err != nil {
-				return err
+				return fmt.Errorf("failed to add static route %s: %v", r.Destination.String(), err)
 			}
 		}
 	}
@@ -117,14 +114,10 @@ func (s *sandboxData) addEndpoint(ep *endpoint) error {
 		}
 	}
 
-	s.Lock()
-	s.refCnt++
-	s.Unlock()
-
 	return nil
 }
 
-func (s *sandboxData) rmEndpoint(ep *endpoint) int {
+func (s *sandboxData) rmEndpoint(ep *endpoint) {
 	ep.Lock()
 	joinInfo := ep.joinInfo
 	ep.Unlock()
@@ -171,17 +164,6 @@ func (s *sandboxData) rmEndpoint(ep *endpoint) int {
 	if highEpBefore != highEpAfter {
 		s.updateGateway(highEpAfter)
 	}
-
-	s.Lock()
-	s.refCnt--
-	refCnt := s.refCnt
-	s.Unlock()
-
-	if refCnt == 0 {
-		s.sandbox().Destroy()
-	}
-
-	return refCnt
 }
 
 func (s *sandboxData) sandbox() sandbox.Sandbox {
@@ -199,7 +181,7 @@ func (c *controller) sandboxAdd(key string, create bool, ep *endpoint) (sandbox.
 	if !ok {
 		sb, err := sandbox.NewSandbox(key, create)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("failed to create new sandbox: %v", err)
 		}
 
 		sData = &sandboxData{
@@ -225,11 +207,7 @@ func (c *controller) sandboxRm(key string, ep *endpoint) {
 	sData := c.sandboxes[key]
 	c.Unlock()
 
-	if sData.rmEndpoint(ep) == 0 {
-		c.Lock()
-		delete(c.sandboxes, key)
-		c.Unlock()
-	}
+	sData.rmEndpoint(ep)
 }
 
 func (c *controller) sandboxGet(key string) sandbox.Sandbox {
@@ -243,3 +221,31 @@ func (c *controller) sandboxGet(key string) sandbox.Sandbox {
 
 	return sData.sandbox()
 }
+
+func (c *controller) LeaveAll(id string) error {
+	c.Lock()
+	sData, ok := c.sandboxes[sandbox.GenerateKey(id)]
+	c.Unlock()
+
+	if !ok {
+		return fmt.Errorf("could not find sandbox for container id %s", id)
+	}
+
+	sData.Lock()
+	eps := make([]*endpoint, len(sData.endpoints))
+	for i, ep := range sData.endpoints {
+		eps[i] = ep
+	}
+	sData.Unlock()
+
+	for _, ep := range eps {
+		if err := ep.Leave(id); err != nil {
+			logrus.Warnf("Failed leaving endpoint id %s: %v\n", ep.ID(), err)
+		}
+	}
+
+	sData.sandbox().Destroy()
+	delete(c.sandboxes, sandbox.GenerateKey(id))
+
+	return nil
+}

vendor/src/github.com/docker/libnetwork/store.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	log "github.com/Sirupsen/logrus"
+	"github.com/docker/libkv/store"
 	"github.com/docker/libnetwork/datastore"
 	"github.com/docker/libnetwork/types"
 )
@@ -31,7 +32,21 @@ func (c *controller) initDataStore() error {
 	c.Lock()
 	c.store = store
 	c.Unlock()
-	return c.watchStore()
+
+	nws, err := c.getNetworksFromStore()
+	if err == nil {
+		c.processNetworkUpdate(nws, nil)
+	} else if err != datastore.ErrKeyNotFound {
+		log.Warnf("failed to read networks from datastore during init : %v", err)
+	}
+	return c.watchNetworks()
+}
+
+func (c *controller) getNetworksFromStore() ([]*store.KVPair, error) {
+	c.Lock()
+	cs := c.store
+	c.Unlock()
+	return cs.KVStore().List(datastore.Key(datastore.NetworkKeyPrefix))
 }
 
 func (c *controller) newNetworkFromStore(n *network) error {
@@ -92,22 +107,6 @@ func (c *controller) newEndpointFromStore(key string, ep *endpoint) error {
 	n := ep.network
 	id := ep.id
 	ep.Unlock()
-	if n == nil {
-		// Possibly the watch event for the network has not shown up yet
-		// Try to get network from the store
-		nid, err := networkIDFromEndpointKey(key, ep)
-		if err != nil {
-			return err
-		}
-		n, err = c.getNetworkFromStore(nid)
-		if err != nil {
-			return err
-		}
-		if err := c.newNetworkFromStore(n); err != nil {
-			return err
-		}
-		n = c.networks[nid]
-	}
 
 	_, err := n.EndpointByID(string(id))
 	if err != nil {
@@ -170,7 +169,11 @@ func (c *controller) deleteEndpointFromStore(ep *endpoint) error {
 	return nil
 }
 
-func (c *controller) watchStore() error {
+func (c *controller) watchNetworks() error {
+	if !c.validateDatastoreConfig() {
+		return nil
+	}
+
 	c.Lock()
 	cs := c.store
 	c.Unlock()
@@ -179,64 +182,35 @@ func (c *controller) watchStore() error {
 	if err != nil {
 		return err
 	}
-	epPairs, err := cs.KVStore().WatchTree(datastore.Key(datastore.EndpointKeyPrefix), nil)
-	if err != nil {
-		return err
-	}
 	go func() {
 		for {
 			select {
 			case nws := <-nwPairs:
-				for _, kve := range nws {
-					var n network
-					err := json.Unmarshal(kve.Value, &n)
-					if err != nil {
-						log.Error(err)
-						continue
-					}
-					n.dbIndex = kve.LastIndex
-					c.Lock()
-					existing, ok := c.networks[n.id]
-					c.Unlock()
-					if ok {
-						existing.Lock()
-						// Skip existing network update
-						if existing.dbIndex != n.dbIndex {
-							existing.dbIndex = n.dbIndex
-							existing.endpointCnt = n.endpointCnt
-						}
-						existing.Unlock()
-						continue
-					}
-
-					if err = c.newNetworkFromStore(&n); err != nil {
-						log.Error(err)
+				c.Lock()
+				tmpview := networkTable{}
+				lview := c.networks
+				c.Unlock()
+				for k, v := range lview {
+					global, _ := v.isGlobalScoped()
+					if global {
+						tmpview[k] = v
 					}
 				}
-			case eps := <-epPairs:
-				for _, epe := range eps {
-					var ep endpoint
-					err := json.Unmarshal(epe.Value, &ep)
-					if err != nil {
-						log.Error(err)
+				c.processNetworkUpdate(nws, &tmpview)
+				// Delete processing
+				for k := range tmpview {
+					c.Lock()
+					existing, ok := c.networks[k]
+					c.Unlock()
+					if !ok {
 						continue
 					}
-					ep.dbIndex = epe.LastIndex
-					n, err := c.networkFromEndpointKey(epe.Key, &ep)
-					if err != nil {
-						if _, ok := err.(ErrNoSuchNetwork); !ok {
-							log.Error(err)
-							continue
-						}
+					tmp := network{}
+					if err := c.store.GetObject(datastore.Key(existing.Key()...), &tmp); err != datastore.ErrKeyNotFound {
+						continue
 					}
-					if n != nil {
-						ep.network = n.(*network)
-					}
-					if c.processEndpointUpdate(&ep) {
-						err = c.newEndpointFromStore(epe.Key, &ep)
-						if err != nil {
-							log.Error(err)
-						}
+					if err := existing.deleteNetwork(); err != nil {
+						log.Debugf("Delete failed %s: %s", existing.name, err)
 					}
 				}
 			}
@@ -245,20 +219,116 @@ func (c *controller) watchStore() error {
 	return nil
 }
 
-func (c *controller) networkFromEndpointKey(key string, ep *endpoint) (Network, error) {
-	nid, err := networkIDFromEndpointKey(key, ep)
-	if err != nil {
-		return nil, err
+func (n *network) watchEndpoints() error {
+	if !n.ctrlr.validateDatastoreConfig() {
+		return nil
 	}
-	return c.NetworkByID(string(nid))
+
+	n.Lock()
+	cs := n.ctrlr.store
+	tmp := endpoint{network: n}
+	n.stopWatchCh = make(chan struct{})
+	stopCh := n.stopWatchCh
+	n.Unlock()
+
+	epPairs, err := cs.KVStore().WatchTree(datastore.Key(tmp.KeyPrefix()...), stopCh)
+	if err != nil {
+		return err
+	}
+	go func() {
+		for {
+			select {
+			case <-stopCh:
+				return
+			case eps := <-epPairs:
+				n.Lock()
+				tmpview := endpointTable{}
+				lview := n.endpoints
+				n.Unlock()
+				for k, v := range lview {
+					global, _ := v.network.isGlobalScoped()
+					if global {
+						tmpview[k] = v
+					}
+				}
+				for _, epe := range eps {
+					var ep endpoint
+					err := json.Unmarshal(epe.Value, &ep)
+					if err != nil {
+						log.Error(err)
+						continue
+					}
+					delete(tmpview, ep.id)
+					ep.dbIndex = epe.LastIndex
+					ep.network = n
+					if n.ctrlr.processEndpointUpdate(&ep) {
+						err = n.ctrlr.newEndpointFromStore(epe.Key, &ep)
+						if err != nil {
+							log.Error(err)
+						}
+					}
+				}
+				// Delete processing
+				for k := range tmpview {
+					n.Lock()
+					existing, ok := n.endpoints[k]
+					n.Unlock()
+					if !ok {
+						continue
+					}
+					tmp := endpoint{}
+					if err := cs.GetObject(datastore.Key(existing.Key()...), &tmp); err != datastore.ErrKeyNotFound {
+						continue
+					}
+					if err := existing.deleteEndpoint(); err != nil {
+						log.Debugf("Delete failed %s: %s", existing.name, err)
+					}
+				}
+			}
+		}
+	}()
+	return nil
 }
 
-func networkIDFromEndpointKey(key string, ep *endpoint) (types.UUID, error) {
-	eKey, err := datastore.ParseKey(key)
-	if err != nil {
-		return types.UUID(""), err
+func (n *network) stopWatch() {
+	n.Lock()
+	if n.stopWatchCh != nil {
+		close(n.stopWatchCh)
+		n.stopWatchCh = nil
+	}
+	n.Unlock()
+}
+
+func (c *controller) processNetworkUpdate(nws []*store.KVPair, prune *networkTable) {
+	for _, kve := range nws {
+		var n network
+		err := json.Unmarshal(kve.Value, &n)
+		if err != nil {
+			log.Error(err)
+			continue
+		}
+		if prune != nil {
+			delete(*prune, n.id)
+		}
+		n.dbIndex = kve.LastIndex
+		c.Lock()
+		existing, ok := c.networks[n.id]
+		c.Unlock()
+		if ok {
+			existing.Lock()
+			// Skip existing network update
+			if existing.dbIndex != n.dbIndex {
+				existing.dbIndex = n.dbIndex
+				existing.endpointCnt = n.endpointCnt
+			}
+			existing.Unlock()
+			continue
+		}
+
+		if err = c.newNetworkFromStore(&n); err != nil {
+			log.Error(err)
+		}
 	}
-	return ep.networkIDFromKey(eKey)
 }
 
 func (c *controller) processEndpointUpdate(ep *endpoint) bool {

vendor/src/github.com/docker/libnetwork/types/types.go

@@ -228,6 +228,12 @@ type MaskableError interface {
 	Maskable()
 }
 
+// RetryError is an interface for errors which might get resolved through retry
+type RetryError interface {
+	// Retry makes implementer into RetryError type
+	Retry()
+}
+
 // BadRequestError is an interface for errors originated by a bad request
 type BadRequestError interface {
 	// BadRequest makes implementer into BadRequestError type
@@ -271,7 +277,7 @@ type InternalError interface {
 }
 
 /******************************
- * Weel-known Error Formatters
+ * Well-known Error Formatters
  ******************************/
 
 // BadRequestErrorf creates an instance of BadRequestError
@@ -314,6 +320,11 @@ func InternalMaskableErrorf(format string, params ...interface{}) error {
 	return maskInternal(fmt.Sprintf(format, params...))
 }
 
+// RetryErrorf creates an instance of RetryError
+func RetryErrorf(format string, params ...interface{}) error {
+	return retry(fmt.Sprintf(format, params...))
+}
+
 /***********************
  * Internal Error Types
  ***********************/
@@ -377,3 +388,10 @@ func (mnt maskInternal) Error() string {
 }
 func (mnt maskInternal) Internal() {}
 func (mnt maskInternal) Maskable() {}
+
+type retry string
+
+func (r retry) Error() string {
+	return string(r)
+}
+func (r retry) Retry() {}

vendor/src/github.com/hashicorp/go-msgpack/codec/0doc.go

@@ -0,0 +1,143 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+/*
+High Performance, Feature-Rich Idiomatic Go encoding library for msgpack and binc .
+
+Supported Serialization formats are:
+
+  - msgpack: [https://github.com/msgpack/msgpack]
+  - binc: [http://github.com/ugorji/binc]
+
+To install:
+
+    go get github.com/ugorji/go/codec
+
+The idiomatic Go support is as seen in other encoding packages in
+the standard library (ie json, xml, gob, etc).
+
+Rich Feature Set includes:
+
+  - Simple but extremely powerful and feature-rich API
+  - Very High Performance.
+    Our extensive benchmarks show us outperforming Gob, Json and Bson by 2-4X.
+    This was achieved by taking extreme care on:
+      - managing allocation
+      - function frame size (important due to Go's use of split stacks),
+      - reflection use (and by-passing reflection for common types)
+      - recursion implications
+      - zero-copy mode (encoding/decoding to byte slice without using temp buffers)
+  - Correct.
+    Care was taken to precisely handle corner cases like:
+      overflows, nil maps and slices, nil value in stream, etc.
+  - Efficient zero-copying into temporary byte buffers
+    when encoding into or decoding from a byte slice.
+  - Standard field renaming via tags
+  - Encoding from any value
+    (struct, slice, map, primitives, pointers, interface{}, etc)
+  - Decoding into pointer to any non-nil typed value
+    (struct, slice, map, int, float32, bool, string, reflect.Value, etc)
+  - Supports extension functions to handle the encode/decode of custom types
+  - Support Go 1.2 encoding.BinaryMarshaler/BinaryUnmarshaler
+  - Schema-less decoding
+    (decode into a pointer to a nil interface{} as opposed to a typed non-nil value).
+    Includes Options to configure what specific map or slice type to use
+    when decoding an encoded list or map into a nil interface{}
+  - Provides a RPC Server and Client Codec for net/rpc communication protocol.
+  - Msgpack Specific:
+      - Provides extension functions to handle spec-defined extensions (binary, timestamp)
+      - Options to resolve ambiguities in handling raw bytes (as string or []byte)
+        during schema-less decoding (decoding into a nil interface{})
+      - RPC Server/Client Codec for msgpack-rpc protocol defined at:
+        https://github.com/msgpack-rpc/msgpack-rpc/blob/master/spec.md
+  - Fast Paths for some container types:
+    For some container types, we circumvent reflection and its associated overhead
+    and allocation costs, and encode/decode directly. These types are:
+	    []interface{}
+	    []int
+	    []string
+	    map[interface{}]interface{}
+	    map[int]interface{}
+	    map[string]interface{}
+
+Extension Support
+
+Users can register a function to handle the encoding or decoding of
+their custom types.
+
+There are no restrictions on what the custom type can be. Some examples:
+
+    type BisSet   []int
+    type BitSet64 uint64
+    type UUID     string
+    type MyStructWithUnexportedFields struct { a int; b bool; c []int; }
+    type GifImage struct { ... }
+
+As an illustration, MyStructWithUnexportedFields would normally be
+encoded as an empty map because it has no exported fields, while UUID
+would be encoded as a string. However, with extension support, you can
+encode any of these however you like.
+
+RPC
+
+RPC Client and Server Codecs are implemented, so the codecs can be used
+with the standard net/rpc package.
+
+Usage
+
+Typical usage model:
+
+    // create and configure Handle
+    var (
+      bh codec.BincHandle
+      mh codec.MsgpackHandle
+    )
+
+    mh.MapType = reflect.TypeOf(map[string]interface{}(nil))
+
+    // configure extensions
+    // e.g. for msgpack, define functions and enable Time support for tag 1
+    // mh.AddExt(reflect.TypeOf(time.Time{}), 1, myMsgpackTimeEncodeExtFn, myMsgpackTimeDecodeExtFn)
+
+    // create and use decoder/encoder
+    var (
+      r io.Reader
+      w io.Writer
+      b []byte
+      h = &bh // or mh to use msgpack
+    )
+
+    dec = codec.NewDecoder(r, h)
+    dec = codec.NewDecoderBytes(b, h)
+    err = dec.Decode(&v)
+
+    enc = codec.NewEncoder(w, h)
+    enc = codec.NewEncoderBytes(&b, h)
+    err = enc.Encode(v)
+
+    //RPC Server
+    go func() {
+        for {
+            conn, err := listener.Accept()
+            rpcCodec := codec.GoRpc.ServerCodec(conn, h)
+            //OR rpcCodec := codec.MsgpackSpecRpc.ServerCodec(conn, h)
+            rpc.ServeCodec(rpcCodec)
+        }
+    }()
+
+    //RPC Communication (client side)
+    conn, err = net.Dial("tcp", "localhost:5555")
+    rpcCodec := codec.GoRpc.ClientCodec(conn, h)
+    //OR rpcCodec := codec.MsgpackSpecRpc.ClientCodec(conn, h)
+    client := rpc.NewClientWithCodec(rpcCodec)
+
+Representative Benchmark Results
+
+Run the benchmark suite using:
+   go test -bi -bench=. -benchmem
+
+To run full benchmark suite (including against vmsgpack and bson),
+see notes in ext_dep_test.go
+
+*/
+package codec

vendor/src/github.com/hashicorp/go-msgpack/codec/README.md

@@ -0,0 +1,174 @@
+# Codec
+
+High Performance and Feature-Rich Idiomatic Go Library providing
+encode/decode support for different serialization formats.
+
+Supported Serialization formats are:
+
+  - msgpack: [https://github.com/msgpack/msgpack]
+  - binc: [http://github.com/ugorji/binc]
+
+To install:
+
+    go get github.com/ugorji/go/codec
+
+Online documentation: [http://godoc.org/github.com/ugorji/go/codec]
+
+The idiomatic Go support is as seen in other encoding packages in
+the standard library (ie json, xml, gob, etc).
+
+Rich Feature Set includes:
+
+  - Simple but extremely powerful and feature-rich API
+  - Very High Performance.   
+    Our extensive benchmarks show us outperforming Gob, Json and Bson by 2-4X.
+    This was achieved by taking extreme care on:
+      - managing allocation
+      - function frame size (important due to Go's use of split stacks),
+      - reflection use (and by-passing reflection for common types)
+      - recursion implications
+      - zero-copy mode (encoding/decoding to byte slice without using temp buffers)
+  - Correct.  
+    Care was taken to precisely handle corner cases like: 
+      overflows, nil maps and slices, nil value in stream, etc.
+  - Efficient zero-copying into temporary byte buffers  
+    when encoding into or decoding from a byte slice.
+  - Standard field renaming via tags
+  - Encoding from any value  
+    (struct, slice, map, primitives, pointers, interface{}, etc)
+  - Decoding into pointer to any non-nil typed value  
+    (struct, slice, map, int, float32, bool, string, reflect.Value, etc)
+  - Supports extension functions to handle the encode/decode of custom types
+  - Support Go 1.2 encoding.BinaryMarshaler/BinaryUnmarshaler
+  - Schema-less decoding  
+    (decode into a pointer to a nil interface{} as opposed to a typed non-nil value).  
+    Includes Options to configure what specific map or slice type to use 
+    when decoding an encoded list or map into a nil interface{}
+  - Provides a RPC Server and Client Codec for net/rpc communication protocol.
+  - Msgpack Specific:
+      - Provides extension functions to handle spec-defined extensions (binary, timestamp)
+      - Options to resolve ambiguities in handling raw bytes (as string or []byte)  
+        during schema-less decoding (decoding into a nil interface{})
+      - RPC Server/Client Codec for msgpack-rpc protocol defined at: 
+        https://github.com/msgpack-rpc/msgpack-rpc/blob/master/spec.md
+  - Fast Paths for some container types:  
+    For some container types, we circumvent reflection and its associated overhead
+    and allocation costs, and encode/decode directly. These types are:  
+	    []interface{}
+	    []int
+	    []string
+	    map[interface{}]interface{}
+	    map[int]interface{}
+	    map[string]interface{}
+
+## Extension Support
+
+Users can register a function to handle the encoding or decoding of
+their custom types.
+
+There are no restrictions on what the custom type can be. Some examples:
+
+    type BisSet   []int
+    type BitSet64 uint64
+    type UUID     string
+    type MyStructWithUnexportedFields struct { a int; b bool; c []int; }
+    type GifImage struct { ... }
+
+As an illustration, MyStructWithUnexportedFields would normally be
+encoded as an empty map because it has no exported fields, while UUID
+would be encoded as a string. However, with extension support, you can
+encode any of these however you like.
+
+## RPC
+
+RPC Client and Server Codecs are implemented, so the codecs can be used
+with the standard net/rpc package.
+
+## Usage
+
+Typical usage model:
+
+    // create and configure Handle
+    var (
+      bh codec.BincHandle
+      mh codec.MsgpackHandle
+    )
+
+    mh.MapType = reflect.TypeOf(map[string]interface{}(nil))
+    
+    // configure extensions
+    // e.g. for msgpack, define functions and enable Time support for tag 1
+    // mh.AddExt(reflect.TypeOf(time.Time{}), 1, myMsgpackTimeEncodeExtFn, myMsgpackTimeDecodeExtFn)
+
+    // create and use decoder/encoder
+    var (
+      r io.Reader
+      w io.Writer
+      b []byte
+      h = &bh // or mh to use msgpack
+    )
+    
+    dec = codec.NewDecoder(r, h)
+    dec = codec.NewDecoderBytes(b, h)
+    err = dec.Decode(&v) 
+    
+    enc = codec.NewEncoder(w, h)
+    enc = codec.NewEncoderBytes(&b, h)
+    err = enc.Encode(v)
+    
+    //RPC Server
+    go func() {
+        for {
+            conn, err := listener.Accept()
+            rpcCodec := codec.GoRpc.ServerCodec(conn, h)
+            //OR rpcCodec := codec.MsgpackSpecRpc.ServerCodec(conn, h)
+            rpc.ServeCodec(rpcCodec)
+        }
+    }()
+
+    //RPC Communication (client side)
+    conn, err = net.Dial("tcp", "localhost:5555")
+    rpcCodec := codec.GoRpc.ClientCodec(conn, h)
+    //OR rpcCodec := codec.MsgpackSpecRpc.ClientCodec(conn, h)
+    client := rpc.NewClientWithCodec(rpcCodec)
+
+## Representative Benchmark Results
+
+A sample run of benchmark using "go test -bi -bench=. -benchmem":
+
+    /proc/cpuinfo: Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz (HT)
+    
+    ..............................................
+    BENCHMARK INIT: 2013-10-16 11:02:50.345970786 -0400 EDT
+    To run full benchmark comparing encodings (MsgPack, Binc, JSON, GOB, etc), use: "go test -bench=."
+    Benchmark: 
+    	Struct recursive Depth:             1
+    	ApproxDeepSize Of benchmark Struct: 4694 bytes
+    Benchmark One-Pass Run:
+    	 v-msgpack: len: 1600 bytes
+    	      bson: len: 3025 bytes
+    	   msgpack: len: 1560 bytes
+    	      binc: len: 1187 bytes
+    	       gob: len: 1972 bytes
+    	      json: len: 2538 bytes
+    ..............................................
+    PASS
+    Benchmark__Msgpack____Encode	   50000	     54359 ns/op	   14953 B/op	      83 allocs/op
+    Benchmark__Msgpack____Decode	   10000	    106531 ns/op	   14990 B/op	     410 allocs/op
+    Benchmark__Binc_NoSym_Encode	   50000	     53956 ns/op	   14966 B/op	      83 allocs/op
+    Benchmark__Binc_NoSym_Decode	   10000	    103751 ns/op	   14529 B/op	     386 allocs/op
+    Benchmark__Binc_Sym___Encode	   50000	     65961 ns/op	   17130 B/op	      88 allocs/op
+    Benchmark__Binc_Sym___Decode	   10000	    106310 ns/op	   15857 B/op	     287 allocs/op
+    Benchmark__Gob________Encode	   10000	    135944 ns/op	   21189 B/op	     237 allocs/op
+    Benchmark__Gob________Decode	    5000	    405390 ns/op	   83460 B/op	    1841 allocs/op
+    Benchmark__Json_______Encode	   20000	     79412 ns/op	   13874 B/op	     102 allocs/op
+    Benchmark__Json_______Decode	   10000	    247979 ns/op	   14202 B/op	     493 allocs/op
+    Benchmark__Bson_______Encode	   10000	    121762 ns/op	   27814 B/op	     514 allocs/op
+    Benchmark__Bson_______Decode	   10000	    162126 ns/op	   16514 B/op	     789 allocs/op
+    Benchmark__VMsgpack___Encode	   50000	     69155 ns/op	   12370 B/op	     344 allocs/op
+    Benchmark__VMsgpack___Decode	   10000	    151609 ns/op	   20307 B/op	     571 allocs/op
+    ok  	ugorji.net/codec	30.827s
+
+To run full benchmark suite (including against vmsgpack and bson), 
+see notes in ext\_dep\_test.go
+

vendor/src/github.com/hashicorp/go-msgpack/codec/binc.go

@@ -0,0 +1,786 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+package codec
+
+import (
+	"math"
+	// "reflect"
+	// "sync/atomic"
+	"time"
+	//"fmt"
+)
+
+const bincDoPrune = true // No longer needed. Needed before as C lib did not support pruning.
+
+//var _ = fmt.Printf
+
+// vd as low 4 bits (there are 16 slots)
+const (
+	bincVdSpecial byte = iota
+	bincVdPosInt
+	bincVdNegInt
+	bincVdFloat
+
+	bincVdString
+	bincVdByteArray
+	bincVdArray
+	bincVdMap
+
+	bincVdTimestamp
+	bincVdSmallInt
+	bincVdUnicodeOther
+	bincVdSymbol
+
+	bincVdDecimal
+	_               // open slot
+	_               // open slot
+	bincVdCustomExt = 0x0f
+)
+
+const (
+	bincSpNil byte = iota
+	bincSpFalse
+	bincSpTrue
+	bincSpNan
+	bincSpPosInf
+	bincSpNegInf
+	bincSpZeroFloat
+	bincSpZero
+	bincSpNegOne
+)
+
+const (
+	bincFlBin16 byte = iota
+	bincFlBin32
+	_ // bincFlBin32e
+	bincFlBin64
+	_ // bincFlBin64e
+	// others not currently supported
+)
+
+type bincEncDriver struct {
+	w encWriter
+	m map[string]uint16 // symbols
+	s uint32            // symbols sequencer
+	b [8]byte
+}
+
+func (e *bincEncDriver) isBuiltinType(rt uintptr) bool {
+	return rt == timeTypId
+}
+
+func (e *bincEncDriver) encodeBuiltin(rt uintptr, v interface{}) {
+	switch rt {
+	case timeTypId:
+		bs := encodeTime(v.(time.Time))
+		e.w.writen1(bincVdTimestamp<<4 | uint8(len(bs)))
+		e.w.writeb(bs)
+	}
+}
+
+func (e *bincEncDriver) encodeNil() {
+	e.w.writen1(bincVdSpecial<<4 | bincSpNil)
+}
+
+func (e *bincEncDriver) encodeBool(b bool) {
+	if b {
+		e.w.writen1(bincVdSpecial<<4 | bincSpTrue)
+	} else {
+		e.w.writen1(bincVdSpecial<<4 | bincSpFalse)
+	}
+}
+
+func (e *bincEncDriver) encodeFloat32(f float32) {
+	if f == 0 {
+		e.w.writen1(bincVdSpecial<<4 | bincSpZeroFloat)
+		return
+	}
+	e.w.writen1(bincVdFloat<<4 | bincFlBin32)
+	e.w.writeUint32(math.Float32bits(f))
+}
+
+func (e *bincEncDriver) encodeFloat64(f float64) {
+	if f == 0 {
+		e.w.writen1(bincVdSpecial<<4 | bincSpZeroFloat)
+		return
+	}
+	bigen.PutUint64(e.b[:], math.Float64bits(f))
+	if bincDoPrune {
+		i := 7
+		for ; i >= 0 && (e.b[i] == 0); i-- {
+		}
+		i++
+		if i <= 6 {
+			e.w.writen1(bincVdFloat<<4 | 0x8 | bincFlBin64)
+			e.w.writen1(byte(i))
+			e.w.writeb(e.b[:i])
+			return
+		}
+	}
+	e.w.writen1(bincVdFloat<<4 | bincFlBin64)
+	e.w.writeb(e.b[:])
+}
+
+func (e *bincEncDriver) encIntegerPrune(bd byte, pos bool, v uint64, lim uint8) {
+	if lim == 4 {
+		bigen.PutUint32(e.b[:lim], uint32(v))
+	} else {
+		bigen.PutUint64(e.b[:lim], v)
+	}
+	if bincDoPrune {
+		i := pruneSignExt(e.b[:lim], pos)
+		e.w.writen1(bd | lim - 1 - byte(i))
+		e.w.writeb(e.b[i:lim])
+	} else {
+		e.w.writen1(bd | lim - 1)
+		e.w.writeb(e.b[:lim])
+	}
+}
+
+func (e *bincEncDriver) encodeInt(v int64) {
+	const nbd byte = bincVdNegInt << 4
+	switch {
+	case v >= 0:
+		e.encUint(bincVdPosInt<<4, true, uint64(v))
+	case v == -1:
+		e.w.writen1(bincVdSpecial<<4 | bincSpNegOne)
+	default:
+		e.encUint(bincVdNegInt<<4, false, uint64(-v))
+	}
+}
+
+func (e *bincEncDriver) encodeUint(v uint64) {
+	e.encUint(bincVdPosInt<<4, true, v)
+}
+
+func (e *bincEncDriver) encUint(bd byte, pos bool, v uint64) {
+	switch {
+	case v == 0:
+		e.w.writen1(bincVdSpecial<<4 | bincSpZero)
+	case pos && v >= 1 && v <= 16:
+		e.w.writen1(bincVdSmallInt<<4 | byte(v-1))
+	case v <= math.MaxUint8:
+		e.w.writen2(bd|0x0, byte(v))
+	case v <= math.MaxUint16:
+		e.w.writen1(bd | 0x01)
+		e.w.writeUint16(uint16(v))
+	case v <= math.MaxUint32:
+		e.encIntegerPrune(bd, pos, v, 4)
+	default:
+		e.encIntegerPrune(bd, pos, v, 8)
+	}
+}
+
+func (e *bincEncDriver) encodeExtPreamble(xtag byte, length int) {
+	e.encLen(bincVdCustomExt<<4, uint64(length))
+	e.w.writen1(xtag)
+}
+
+func (e *bincEncDriver) encodeArrayPreamble(length int) {
+	e.encLen(bincVdArray<<4, uint64(length))
+}
+
+func (e *bincEncDriver) encodeMapPreamble(length int) {
+	e.encLen(bincVdMap<<4, uint64(length))
+}
+
+func (e *bincEncDriver) encodeString(c charEncoding, v string) {
+	l := uint64(len(v))
+	e.encBytesLen(c, l)
+	if l > 0 {
+		e.w.writestr(v)
+	}
+}
+
+func (e *bincEncDriver) encodeSymbol(v string) {
+	// if WriteSymbolsNoRefs {
+	// 	e.encodeString(c_UTF8, v)
+	// 	return
+	// }
+
+	//symbols only offer benefit when string length > 1.
+	//This is because strings with length 1 take only 2 bytes to store
+	//(bd with embedded length, and single byte for string val).
+
+	l := len(v)
+	switch l {
+	case 0:
+		e.encBytesLen(c_UTF8, 0)
+		return
+	case 1:
+		e.encBytesLen(c_UTF8, 1)
+		e.w.writen1(v[0])
+		return
+	}
+	if e.m == nil {
+		e.m = make(map[string]uint16, 16)
+	}
+	ui, ok := e.m[v]
+	if ok {
+		if ui <= math.MaxUint8 {
+			e.w.writen2(bincVdSymbol<<4, byte(ui))
+		} else {
+			e.w.writen1(bincVdSymbol<<4 | 0x8)
+			e.w.writeUint16(ui)
+		}
+	} else {
+		e.s++
+		ui = uint16(e.s)
+		//ui = uint16(atomic.AddUint32(&e.s, 1))
+		e.m[v] = ui
+		var lenprec uint8
+		switch {
+		case l <= math.MaxUint8:
+			// lenprec = 0
+		case l <= math.MaxUint16:
+			lenprec = 1
+		case int64(l) <= math.MaxUint32:
+			lenprec = 2
+		default:
+			lenprec = 3
+		}
+		if ui <= math.MaxUint8 {
+			e.w.writen2(bincVdSymbol<<4|0x0|0x4|lenprec, byte(ui))
+		} else {
+			e.w.writen1(bincVdSymbol<<4 | 0x8 | 0x4 | lenprec)
+			e.w.writeUint16(ui)
+		}
+		switch lenprec {
+		case 0:
+			e.w.writen1(byte(l))
+		case 1:
+			e.w.writeUint16(uint16(l))
+		case 2:
+			e.w.writeUint32(uint32(l))
+		default:
+			e.w.writeUint64(uint64(l))
+		}
+		e.w.writestr(v)
+	}
+}
+
+func (e *bincEncDriver) encodeStringBytes(c charEncoding, v []byte) {
+	l := uint64(len(v))
+	e.encBytesLen(c, l)
+	if l > 0 {
+		e.w.writeb(v)
+	}
+}
+
+func (e *bincEncDriver) encBytesLen(c charEncoding, length uint64) {
+	//TODO: support bincUnicodeOther (for now, just use string or bytearray)
+	if c == c_RAW {
+		e.encLen(bincVdByteArray<<4, length)
+	} else {
+		e.encLen(bincVdString<<4, length)
+	}
+}
+
+func (e *bincEncDriver) encLen(bd byte, l uint64) {
+	if l < 12 {
+		e.w.writen1(bd | uint8(l+4))
+	} else {
+		e.encLenNumber(bd, l)
+	}
+}
+
+func (e *bincEncDriver) encLenNumber(bd byte, v uint64) {
+	switch {
+	case v <= math.MaxUint8:
+		e.w.writen2(bd, byte(v))
+	case v <= math.MaxUint16:
+		e.w.writen1(bd | 0x01)
+		e.w.writeUint16(uint16(v))
+	case v <= math.MaxUint32:
+		e.w.writen1(bd | 0x02)
+		e.w.writeUint32(uint32(v))
+	default:
+		e.w.writen1(bd | 0x03)
+		e.w.writeUint64(uint64(v))
+	}
+}
+
+//------------------------------------
+
+type bincDecDriver struct {
+	r      decReader
+	bdRead bool
+	bdType valueType
+	bd     byte
+	vd     byte
+	vs     byte
+	b      [8]byte
+	m      map[uint32]string // symbols (use uint32 as key, as map optimizes for it)
+}
+
+func (d *bincDecDriver) initReadNext() {
+	if d.bdRead {
+		return
+	}
+	d.bd = d.r.readn1()
+	d.vd = d.bd >> 4
+	d.vs = d.bd & 0x0f
+	d.bdRead = true
+	d.bdType = valueTypeUnset
+}
+
+func (d *bincDecDriver) currentEncodedType() valueType {
+	if d.bdType == valueTypeUnset {
+		switch d.vd {
+		case bincVdSpecial:
+			switch d.vs {
+			case bincSpNil:
+				d.bdType = valueTypeNil
+			case bincSpFalse, bincSpTrue:
+				d.bdType = valueTypeBool
+			case bincSpNan, bincSpNegInf, bincSpPosInf, bincSpZeroFloat:
+				d.bdType = valueTypeFloat
+			case bincSpZero:
+				d.bdType = valueTypeUint
+			case bincSpNegOne:
+				d.bdType = valueTypeInt
+			default:
+				decErr("currentEncodedType: Unrecognized special value 0x%x", d.vs)
+			}
+		case bincVdSmallInt:
+			d.bdType = valueTypeUint
+		case bincVdPosInt:
+			d.bdType = valueTypeUint
+		case bincVdNegInt:
+			d.bdType = valueTypeInt
+		case bincVdFloat:
+			d.bdType = valueTypeFloat
+		case bincVdString:
+			d.bdType = valueTypeString
+		case bincVdSymbol:
+			d.bdType = valueTypeSymbol
+		case bincVdByteArray:
+			d.bdType = valueTypeBytes
+		case bincVdTimestamp:
+			d.bdType = valueTypeTimestamp
+		case bincVdCustomExt:
+			d.bdType = valueTypeExt
+		case bincVdArray:
+			d.bdType = valueTypeArray
+		case bincVdMap:
+			d.bdType = valueTypeMap
+		default:
+			decErr("currentEncodedType: Unrecognized d.vd: 0x%x", d.vd)
+		}
+	}
+	return d.bdType
+}
+
+func (d *bincDecDriver) tryDecodeAsNil() bool {
+	if d.bd == bincVdSpecial<<4|bincSpNil {
+		d.bdRead = false
+		return true
+	}
+	return false
+}
+
+func (d *bincDecDriver) isBuiltinType(rt uintptr) bool {
+	return rt == timeTypId
+}
+
+func (d *bincDecDriver) decodeBuiltin(rt uintptr, v interface{}) {
+	switch rt {
+	case timeTypId:
+		if d.vd != bincVdTimestamp {
+			decErr("Invalid d.vd. Expecting 0x%x. Received: 0x%x", bincVdTimestamp, d.vd)
+		}
+		tt, err := decodeTime(d.r.readn(int(d.vs)))
+		if err != nil {
+			panic(err)
+		}
+		var vt *time.Time = v.(*time.Time)
+		*vt = tt
+		d.bdRead = false
+	}
+}
+
+func (d *bincDecDriver) decFloatPre(vs, defaultLen byte) {
+	if vs&0x8 == 0 {
+		d.r.readb(d.b[0:defaultLen])
+	} else {
+		l := d.r.readn1()
+		if l > 8 {
+			decErr("At most 8 bytes used to represent float. Received: %v bytes", l)
+		}
+		for i := l; i < 8; i++ {
+			d.b[i] = 0
+		}
+		d.r.readb(d.b[0:l])
+	}
+}
+
+func (d *bincDecDriver) decFloat() (f float64) {
+	//if true { f = math.Float64frombits(d.r.readUint64()); break; }
+	switch vs := d.vs; vs & 0x7 {
+	case bincFlBin32:
+		d.decFloatPre(vs, 4)
+		f = float64(math.Float32frombits(bigen.Uint32(d.b[0:4])))
+	case bincFlBin64:
+		d.decFloatPre(vs, 8)
+		f = math.Float64frombits(bigen.Uint64(d.b[0:8]))
+	default:
+		decErr("only float32 and float64 are supported. d.vd: 0x%x, d.vs: 0x%x", d.vd, d.vs)
+	}
+	return
+}
+
+func (d *bincDecDriver) decUint() (v uint64) {
+	// need to inline the code (interface conversion and type assertion expensive)
+	switch d.vs {
+	case 0:
+		v = uint64(d.r.readn1())
+	case 1:
+		d.r.readb(d.b[6:])
+		v = uint64(bigen.Uint16(d.b[6:]))
+	case 2:
+		d.b[4] = 0
+		d.r.readb(d.b[5:])
+		v = uint64(bigen.Uint32(d.b[4:]))
+	case 3:
+		d.r.readb(d.b[4:])
+		v = uint64(bigen.Uint32(d.b[4:]))
+	case 4, 5, 6:
+		lim := int(7 - d.vs)
+		d.r.readb(d.b[lim:])
+		for i := 0; i < lim; i++ {
+			d.b[i] = 0
+		}
+		v = uint64(bigen.Uint64(d.b[:]))
+	case 7:
+		d.r.readb(d.b[:])
+		v = uint64(bigen.Uint64(d.b[:]))
+	default:
+		decErr("unsigned integers with greater than 64 bits of precision not supported")
+	}
+	return
+}
+
+func (d *bincDecDriver) decIntAny() (ui uint64, i int64, neg bool) {
+	switch d.vd {
+	case bincVdPosInt:
+		ui = d.decUint()
+		i = int64(ui)
+	case bincVdNegInt:
+		ui = d.decUint()
+		i = -(int64(ui))
+		neg = true
+	case bincVdSmallInt:
+		i = int64(d.vs) + 1
+		ui = uint64(d.vs) + 1
+	case bincVdSpecial:
+		switch d.vs {
+		case bincSpZero:
+			//i = 0
+		case bincSpNegOne:
+			neg = true
+			ui = 1
+			i = -1
+		default:
+			decErr("numeric decode fails for special value: d.vs: 0x%x", d.vs)
+		}
+	default:
+		decErr("number can only be decoded from uint or int values. d.bd: 0x%x, d.vd: 0x%x", d.bd, d.vd)
+	}
+	return
+}
+
+func (d *bincDecDriver) decodeInt(bitsize uint8) (i int64) {
+	_, i, _ = d.decIntAny()
+	checkOverflow(0, i, bitsize)
+	d.bdRead = false
+	return
+}
+
+func (d *bincDecDriver) decodeUint(bitsize uint8) (ui uint64) {
+	ui, i, neg := d.decIntAny()
+	if neg {
+		decErr("Assigning negative signed value: %v, to unsigned type", i)
+	}
+	checkOverflow(ui, 0, bitsize)
+	d.bdRead = false
+	return
+}
+
+func (d *bincDecDriver) decodeFloat(chkOverflow32 bool) (f float64) {
+	switch d.vd {
+	case bincVdSpecial:
+		d.bdRead = false
+		switch d.vs {
+		case bincSpNan:
+			return math.NaN()
+		case bincSpPosInf:
+			return math.Inf(1)
+		case bincSpZeroFloat, bincSpZero:
+			return
+		case bincSpNegInf:
+			return math.Inf(-1)
+		default:
+			decErr("Invalid d.vs decoding float where d.vd=bincVdSpecial: %v", d.vs)
+		}
+	case bincVdFloat:
+		f = d.decFloat()
+	default:
+		_, i, _ := d.decIntAny()
+		f = float64(i)
+	}
+	checkOverflowFloat32(f, chkOverflow32)
+	d.bdRead = false
+	return
+}
+
+// bool can be decoded from bool only (single byte).
+func (d *bincDecDriver) decodeBool() (b bool) {
+	switch d.bd {
+	case (bincVdSpecial | bincSpFalse):
+		// b = false
+	case (bincVdSpecial | bincSpTrue):
+		b = true
+	default:
+		decErr("Invalid single-byte value for bool: %s: %x", msgBadDesc, d.bd)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *bincDecDriver) readMapLen() (length int) {
+	if d.vd != bincVdMap {
+		decErr("Invalid d.vd for map. Expecting 0x%x. Got: 0x%x", bincVdMap, d.vd)
+	}
+	length = d.decLen()
+	d.bdRead = false
+	return
+}
+
+func (d *bincDecDriver) readArrayLen() (length int) {
+	if d.vd != bincVdArray {
+		decErr("Invalid d.vd for array. Expecting 0x%x. Got: 0x%x", bincVdArray, d.vd)
+	}
+	length = d.decLen()
+	d.bdRead = false
+	return
+}
+
+func (d *bincDecDriver) decLen() int {
+	if d.vs <= 3 {
+		return int(d.decUint())
+	}
+	return int(d.vs - 4)
+}
+
+func (d *bincDecDriver) decodeString() (s string) {
+	switch d.vd {
+	case bincVdString, bincVdByteArray:
+		if length := d.decLen(); length > 0 {
+			s = string(d.r.readn(length))
+		}
+	case bincVdSymbol:
+		//from vs: extract numSymbolBytes, containsStringVal, strLenPrecision,
+		//extract symbol
+		//if containsStringVal, read it and put in map
+		//else look in map for string value
+		var symbol uint32
+		vs := d.vs
+		//fmt.Printf(">>>> d.vs: 0b%b, & 0x8: %v, & 0x4: %v\n", d.vs, vs & 0x8, vs & 0x4)
+		if vs&0x8 == 0 {
+			symbol = uint32(d.r.readn1())
+		} else {
+			symbol = uint32(d.r.readUint16())
+		}
+		if d.m == nil {
+			d.m = make(map[uint32]string, 16)
+		}
+
+		if vs&0x4 == 0 {
+			s = d.m[symbol]
+		} else {
+			var slen int
+			switch vs & 0x3 {
+			case 0:
+				slen = int(d.r.readn1())
+			case 1:
+				slen = int(d.r.readUint16())
+			case 2:
+				slen = int(d.r.readUint32())
+			case 3:
+				slen = int(d.r.readUint64())
+			}
+			s = string(d.r.readn(slen))
+			d.m[symbol] = s
+		}
+	default:
+		decErr("Invalid d.vd for string. Expecting string:0x%x, bytearray:0x%x or symbol: 0x%x. Got: 0x%x",
+			bincVdString, bincVdByteArray, bincVdSymbol, d.vd)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *bincDecDriver) decodeBytes(bs []byte) (bsOut []byte, changed bool) {
+	var clen int
+	switch d.vd {
+	case bincVdString, bincVdByteArray:
+		clen = d.decLen()
+	default:
+		decErr("Invalid d.vd for bytes. Expecting string:0x%x or bytearray:0x%x. Got: 0x%x",
+			bincVdString, bincVdByteArray, d.vd)
+	}
+	if clen > 0 {
+		// if no contents in stream, don't update the passed byteslice
+		if len(bs) != clen {
+			if len(bs) > clen {
+				bs = bs[:clen]
+			} else {
+				bs = make([]byte, clen)
+			}
+			bsOut = bs
+			changed = true
+		}
+		d.r.readb(bs)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *bincDecDriver) decodeExt(verifyTag bool, tag byte) (xtag byte, xbs []byte) {
+	switch d.vd {
+	case bincVdCustomExt:
+		l := d.decLen()
+		xtag = d.r.readn1()
+		if verifyTag && xtag != tag {
+			decErr("Wrong extension tag. Got %b. Expecting: %v", xtag, tag)
+		}
+		xbs = d.r.readn(l)
+	case bincVdByteArray:
+		xbs, _ = d.decodeBytes(nil)
+	default:
+		decErr("Invalid d.vd for extensions (Expecting extensions or byte array). Got: 0x%x", d.vd)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *bincDecDriver) decodeNaked() (v interface{}, vt valueType, decodeFurther bool) {
+	d.initReadNext()
+
+	switch d.vd {
+	case bincVdSpecial:
+		switch d.vs {
+		case bincSpNil:
+			vt = valueTypeNil
+		case bincSpFalse:
+			vt = valueTypeBool
+			v = false
+		case bincSpTrue:
+			vt = valueTypeBool
+			v = true
+		case bincSpNan:
+			vt = valueTypeFloat
+			v = math.NaN()
+		case bincSpPosInf:
+			vt = valueTypeFloat
+			v = math.Inf(1)
+		case bincSpNegInf:
+			vt = valueTypeFloat
+			v = math.Inf(-1)
+		case bincSpZeroFloat:
+			vt = valueTypeFloat
+			v = float64(0)
+		case bincSpZero:
+			vt = valueTypeUint
+			v = int64(0) // int8(0)
+		case bincSpNegOne:
+			vt = valueTypeInt
+			v = int64(-1) // int8(-1)
+		default:
+			decErr("decodeNaked: Unrecognized special value 0x%x", d.vs)
+		}
+	case bincVdSmallInt:
+		vt = valueTypeUint
+		v = uint64(int8(d.vs)) + 1 // int8(d.vs) + 1
+	case bincVdPosInt:
+		vt = valueTypeUint
+		v = d.decUint()
+	case bincVdNegInt:
+		vt = valueTypeInt
+		v = -(int64(d.decUint()))
+	case bincVdFloat:
+		vt = valueTypeFloat
+		v = d.decFloat()
+	case bincVdSymbol:
+		vt = valueTypeSymbol
+		v = d.decodeString()
+	case bincVdString:
+		vt = valueTypeString
+		v = d.decodeString()
+	case bincVdByteArray:
+		vt = valueTypeBytes
+		v, _ = d.decodeBytes(nil)
+	case bincVdTimestamp:
+		vt = valueTypeTimestamp
+		tt, err := decodeTime(d.r.readn(int(d.vs)))
+		if err != nil {
+			panic(err)
+		}
+		v = tt
+	case bincVdCustomExt:
+		vt = valueTypeExt
+		l := d.decLen()
+		var re RawExt
+		re.Tag = d.r.readn1()
+		re.Data = d.r.readn(l)
+		v = &re
+		vt = valueTypeExt
+	case bincVdArray:
+		vt = valueTypeArray
+		decodeFurther = true
+	case bincVdMap:
+		vt = valueTypeMap
+		decodeFurther = true
+	default:
+		decErr("decodeNaked: Unrecognized d.vd: 0x%x", d.vd)
+	}
+
+	if !decodeFurther {
+		d.bdRead = false
+	}
+	return
+}
+
+//------------------------------------
+
+//BincHandle is a Handle for the Binc Schema-Free Encoding Format
+//defined at https://github.com/ugorji/binc .
+//
+//BincHandle currently supports all Binc features with the following EXCEPTIONS:
+//  - only integers up to 64 bits of precision are supported.
+//    big integers are unsupported.
+//  - Only IEEE 754 binary32 and binary64 floats are supported (ie Go float32 and float64 types).
+//    extended precision and decimal IEEE 754 floats are unsupported.
+//  - Only UTF-8 strings supported.
+//    Unicode_Other Binc types (UTF16, UTF32) are currently unsupported.
+//Note that these EXCEPTIONS are temporary and full support is possible and may happen soon.
+type BincHandle struct {
+	BasicHandle
+}
+
+func (h *BincHandle) newEncDriver(w encWriter) encDriver {
+	return &bincEncDriver{w: w}
+}
+
+func (h *BincHandle) newDecDriver(r decReader) decDriver {
+	return &bincDecDriver{r: r}
+}
+
+func (_ *BincHandle) writeExt() bool {
+	return true
+}
+
+func (h *BincHandle) getBasicHandle() *BasicHandle {
+	return &h.BasicHandle
+}

vendor/src/github.com/hashicorp/go-msgpack/codec/helper.go

@@ -0,0 +1,589 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+package codec
+
+// Contains code shared by both encode and decode.
+
+import (
+	"encoding/binary"
+	"fmt"
+	"math"
+	"reflect"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+	"unicode"
+	"unicode/utf8"
+)
+
+const (
+	structTagName = "codec"
+
+	// Support
+	//    encoding.BinaryMarshaler: MarshalBinary() (data []byte, err error)
+	//    encoding.BinaryUnmarshaler: UnmarshalBinary(data []byte) error
+	// This constant flag will enable or disable it.
+	supportBinaryMarshal = true
+
+	// Each Encoder or Decoder uses a cache of functions based on conditionals,
+	// so that the conditionals are not run every time.
+	//
+	// Either a map or a slice is used to keep track of the functions.
+	// The map is more natural, but has a higher cost than a slice/array.
+	// This flag (useMapForCodecCache) controls which is used.
+	useMapForCodecCache = false
+
+	// For some common container types, we can short-circuit an elaborate
+	// reflection dance and call encode/decode directly.
+	// The currently supported types are:
+	//    - slices of strings, or id's (int64,uint64) or interfaces.
+	//    - maps of str->str, str->intf, id(int64,uint64)->intf, intf->intf
+	shortCircuitReflectToFastPath = true
+
+	// for debugging, set this to false, to catch panic traces.
+	// Note that this will always cause rpc tests to fail, since they need io.EOF sent via panic.
+	recoverPanicToErr = true
+)
+
+type charEncoding uint8
+
+const (
+	c_RAW charEncoding = iota
+	c_UTF8
+	c_UTF16LE
+	c_UTF16BE
+	c_UTF32LE
+	c_UTF32BE
+)
+
+// valueType is the stream type
+type valueType uint8
+
+const (
+	valueTypeUnset valueType = iota
+	valueTypeNil
+	valueTypeInt
+	valueTypeUint
+	valueTypeFloat
+	valueTypeBool
+	valueTypeString
+	valueTypeSymbol
+	valueTypeBytes
+	valueTypeMap
+	valueTypeArray
+	valueTypeTimestamp
+	valueTypeExt
+
+	valueTypeInvalid = 0xff
+)
+
+var (
+	bigen               = binary.BigEndian
+	structInfoFieldName = "_struct"
+
+	cachedTypeInfo      = make(map[uintptr]*typeInfo, 4)
+	cachedTypeInfoMutex sync.RWMutex
+
+	intfSliceTyp = reflect.TypeOf([]interface{}(nil))
+	intfTyp      = intfSliceTyp.Elem()
+
+	strSliceTyp     = reflect.TypeOf([]string(nil))
+	boolSliceTyp    = reflect.TypeOf([]bool(nil))
+	uintSliceTyp    = reflect.TypeOf([]uint(nil))
+	uint8SliceTyp   = reflect.TypeOf([]uint8(nil))
+	uint16SliceTyp  = reflect.TypeOf([]uint16(nil))
+	uint32SliceTyp  = reflect.TypeOf([]uint32(nil))
+	uint64SliceTyp  = reflect.TypeOf([]uint64(nil))
+	intSliceTyp     = reflect.TypeOf([]int(nil))
+	int8SliceTyp    = reflect.TypeOf([]int8(nil))
+	int16SliceTyp   = reflect.TypeOf([]int16(nil))
+	int32SliceTyp   = reflect.TypeOf([]int32(nil))
+	int64SliceTyp   = reflect.TypeOf([]int64(nil))
+	float32SliceTyp = reflect.TypeOf([]float32(nil))
+	float64SliceTyp = reflect.TypeOf([]float64(nil))
+
+	mapIntfIntfTyp = reflect.TypeOf(map[interface{}]interface{}(nil))
+	mapStrIntfTyp  = reflect.TypeOf(map[string]interface{}(nil))
+	mapStrStrTyp   = reflect.TypeOf(map[string]string(nil))
+
+	mapIntIntfTyp    = reflect.TypeOf(map[int]interface{}(nil))
+	mapInt64IntfTyp  = reflect.TypeOf(map[int64]interface{}(nil))
+	mapUintIntfTyp   = reflect.TypeOf(map[uint]interface{}(nil))
+	mapUint64IntfTyp = reflect.TypeOf(map[uint64]interface{}(nil))
+
+	stringTyp = reflect.TypeOf("")
+	timeTyp   = reflect.TypeOf(time.Time{})
+	rawExtTyp = reflect.TypeOf(RawExt{})
+
+	mapBySliceTyp        = reflect.TypeOf((*MapBySlice)(nil)).Elem()
+	binaryMarshalerTyp   = reflect.TypeOf((*binaryMarshaler)(nil)).Elem()
+	binaryUnmarshalerTyp = reflect.TypeOf((*binaryUnmarshaler)(nil)).Elem()
+
+	rawExtTypId = reflect.ValueOf(rawExtTyp).Pointer()
+	intfTypId   = reflect.ValueOf(intfTyp).Pointer()
+	timeTypId   = reflect.ValueOf(timeTyp).Pointer()
+
+	intfSliceTypId = reflect.ValueOf(intfSliceTyp).Pointer()
+	strSliceTypId  = reflect.ValueOf(strSliceTyp).Pointer()
+
+	boolSliceTypId    = reflect.ValueOf(boolSliceTyp).Pointer()
+	uintSliceTypId    = reflect.ValueOf(uintSliceTyp).Pointer()
+	uint8SliceTypId   = reflect.ValueOf(uint8SliceTyp).Pointer()
+	uint16SliceTypId  = reflect.ValueOf(uint16SliceTyp).Pointer()
+	uint32SliceTypId  = reflect.ValueOf(uint32SliceTyp).Pointer()
+	uint64SliceTypId  = reflect.ValueOf(uint64SliceTyp).Pointer()
+	intSliceTypId     = reflect.ValueOf(intSliceTyp).Pointer()
+	int8SliceTypId    = reflect.ValueOf(int8SliceTyp).Pointer()
+	int16SliceTypId   = reflect.ValueOf(int16SliceTyp).Pointer()
+	int32SliceTypId   = reflect.ValueOf(int32SliceTyp).Pointer()
+	int64SliceTypId   = reflect.ValueOf(int64SliceTyp).Pointer()
+	float32SliceTypId = reflect.ValueOf(float32SliceTyp).Pointer()
+	float64SliceTypId = reflect.ValueOf(float64SliceTyp).Pointer()
+
+	mapStrStrTypId     = reflect.ValueOf(mapStrStrTyp).Pointer()
+	mapIntfIntfTypId   = reflect.ValueOf(mapIntfIntfTyp).Pointer()
+	mapStrIntfTypId    = reflect.ValueOf(mapStrIntfTyp).Pointer()
+	mapIntIntfTypId    = reflect.ValueOf(mapIntIntfTyp).Pointer()
+	mapInt64IntfTypId  = reflect.ValueOf(mapInt64IntfTyp).Pointer()
+	mapUintIntfTypId   = reflect.ValueOf(mapUintIntfTyp).Pointer()
+	mapUint64IntfTypId = reflect.ValueOf(mapUint64IntfTyp).Pointer()
+	// Id = reflect.ValueOf().Pointer()
+	// mapBySliceTypId  = reflect.ValueOf(mapBySliceTyp).Pointer()
+
+	binaryMarshalerTypId   = reflect.ValueOf(binaryMarshalerTyp).Pointer()
+	binaryUnmarshalerTypId = reflect.ValueOf(binaryUnmarshalerTyp).Pointer()
+
+	intBitsize  uint8 = uint8(reflect.TypeOf(int(0)).Bits())
+	uintBitsize uint8 = uint8(reflect.TypeOf(uint(0)).Bits())
+
+	bsAll0x00 = []byte{0, 0, 0, 0, 0, 0, 0, 0}
+	bsAll0xff = []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
+)
+
+type binaryUnmarshaler interface {
+	UnmarshalBinary(data []byte) error
+}
+
+type binaryMarshaler interface {
+	MarshalBinary() (data []byte, err error)
+}
+
+// MapBySlice represents a slice which should be encoded as a map in the stream.
+// The slice contains a sequence of key-value pairs.
+type MapBySlice interface {
+	MapBySlice()
+}
+
+// WARNING: DO NOT USE DIRECTLY. EXPORTED FOR GODOC BENEFIT. WILL BE REMOVED.
+//
+// BasicHandle encapsulates the common options and extension functions.
+type BasicHandle struct {
+	extHandle
+	EncodeOptions
+	DecodeOptions
+}
+
+// Handle is the interface for a specific encoding format.
+//
+// Typically, a Handle is pre-configured before first time use,
+// and not modified while in use. Such a pre-configured Handle
+// is safe for concurrent access.
+type Handle interface {
+	writeExt() bool
+	getBasicHandle() *BasicHandle
+	newEncDriver(w encWriter) encDriver
+	newDecDriver(r decReader) decDriver
+}
+
+// RawExt represents raw unprocessed extension data.
+type RawExt struct {
+	Tag  byte
+	Data []byte
+}
+
+type extTypeTagFn struct {
+	rtid  uintptr
+	rt    reflect.Type
+	tag   byte
+	encFn func(reflect.Value) ([]byte, error)
+	decFn func(reflect.Value, []byte) error
+}
+
+type extHandle []*extTypeTagFn
+
+// AddExt registers an encode and decode function for a reflect.Type.
+// Note that the type must be a named type, and specifically not
+// a pointer or Interface. An error is returned if that is not honored.
+//
+// To Deregister an ext, call AddExt with 0 tag, nil encfn and nil decfn.
+func (o *extHandle) AddExt(
+	rt reflect.Type,
+	tag byte,
+	encfn func(reflect.Value) ([]byte, error),
+	decfn func(reflect.Value, []byte) error,
+) (err error) {
+	// o is a pointer, because we may need to initialize it
+	if rt.PkgPath() == "" || rt.Kind() == reflect.Interface {
+		err = fmt.Errorf("codec.Handle.AddExt: Takes named type, especially not a pointer or interface: %T",
+			reflect.Zero(rt).Interface())
+		return
+	}
+
+	// o cannot be nil, since it is always embedded in a Handle.
+	// if nil, let it panic.
+	// if o == nil {
+	// 	err = errors.New("codec.Handle.AddExt: extHandle cannot be a nil pointer.")
+	// 	return
+	// }
+
+	rtid := reflect.ValueOf(rt).Pointer()
+	for _, v := range *o {
+		if v.rtid == rtid {
+			v.tag, v.encFn, v.decFn = tag, encfn, decfn
+			return
+		}
+	}
+
+	*o = append(*o, &extTypeTagFn{rtid, rt, tag, encfn, decfn})
+	return
+}
+
+func (o extHandle) getExt(rtid uintptr) *extTypeTagFn {
+	for _, v := range o {
+		if v.rtid == rtid {
+			return v
+		}
+	}
+	return nil
+}
+
+func (o extHandle) getExtForTag(tag byte) *extTypeTagFn {
+	for _, v := range o {
+		if v.tag == tag {
+			return v
+		}
+	}
+	return nil
+}
+
+func (o extHandle) getDecodeExtForTag(tag byte) (
+	rv reflect.Value, fn func(reflect.Value, []byte) error) {
+	if x := o.getExtForTag(tag); x != nil {
+		// ext is only registered for base
+		rv = reflect.New(x.rt).Elem()
+		fn = x.decFn
+	}
+	return
+}
+
+func (o extHandle) getDecodeExt(rtid uintptr) (tag byte, fn func(reflect.Value, []byte) error) {
+	if x := o.getExt(rtid); x != nil {
+		tag = x.tag
+		fn = x.decFn
+	}
+	return
+}
+
+func (o extHandle) getEncodeExt(rtid uintptr) (tag byte, fn func(reflect.Value) ([]byte, error)) {
+	if x := o.getExt(rtid); x != nil {
+		tag = x.tag
+		fn = x.encFn
+	}
+	return
+}
+
+type structFieldInfo struct {
+	encName string // encode name
+
+	// only one of 'i' or 'is' can be set. If 'i' is -1, then 'is' has been set.
+
+	is        []int // (recursive/embedded) field index in struct
+	i         int16 // field index in struct
+	omitEmpty bool
+	toArray   bool // if field is _struct, is the toArray set?
+
+	// tag       string   // tag
+	// name      string   // field name
+	// encNameBs []byte   // encoded name as byte stream
+	// ikind     int      // kind of the field as an int i.e. int(reflect.Kind)
+}
+
+func parseStructFieldInfo(fname string, stag string) *structFieldInfo {
+	if fname == "" {
+		panic("parseStructFieldInfo: No Field Name")
+	}
+	si := structFieldInfo{
+		// name: fname,
+		encName: fname,
+		// tag: stag,
+	}
+
+	if stag != "" {
+		for i, s := range strings.Split(stag, ",") {
+			if i == 0 {
+				if s != "" {
+					si.encName = s
+				}
+			} else {
+				switch s {
+				case "omitempty":
+					si.omitEmpty = true
+				case "toarray":
+					si.toArray = true
+				}
+			}
+		}
+	}
+	// si.encNameBs = []byte(si.encName)
+	return &si
+}
+
+type sfiSortedByEncName []*structFieldInfo
+
+func (p sfiSortedByEncName) Len() int {
+	return len(p)
+}
+
+func (p sfiSortedByEncName) Less(i, j int) bool {
+	return p[i].encName < p[j].encName
+}
+
+func (p sfiSortedByEncName) Swap(i, j int) {
+	p[i], p[j] = p[j], p[i]
+}
+
+// typeInfo keeps information about each type referenced in the encode/decode sequence.
+//
+// During an encode/decode sequence, we work as below:
+//   - If base is a built in type, en/decode base value
+//   - If base is registered as an extension, en/decode base value
+//   - If type is binary(M/Unm)arshaler, call Binary(M/Unm)arshal method
+//   - Else decode appropriately based on the reflect.Kind
+type typeInfo struct {
+	sfi  []*structFieldInfo // sorted. Used when enc/dec struct to map.
+	sfip []*structFieldInfo // unsorted. Used when enc/dec struct to array.
+
+	rt   reflect.Type
+	rtid uintptr
+
+	// baseId gives pointer to the base reflect.Type, after deferencing
+	// the pointers. E.g. base type of ***time.Time is time.Time.
+	base      reflect.Type
+	baseId    uintptr
+	baseIndir int8 // number of indirections to get to base
+
+	mbs bool // base type (T or *T) is a MapBySlice
+
+	m        bool // base type (T or *T) is a binaryMarshaler
+	unm      bool // base type (T or *T) is a binaryUnmarshaler
+	mIndir   int8 // number of indirections to get to binaryMarshaler type
+	unmIndir int8 // number of indirections to get to binaryUnmarshaler type
+	toArray  bool // whether this (struct) type should be encoded as an array
+}
+
+func (ti *typeInfo) indexForEncName(name string) int {
+	//tisfi := ti.sfi
+	const binarySearchThreshold = 16
+	if sfilen := len(ti.sfi); sfilen < binarySearchThreshold {
+		// linear search. faster than binary search in my testing up to 16-field structs.
+		for i, si := range ti.sfi {
+			if si.encName == name {
+				return i
+			}
+		}
+	} else {
+		// binary search. adapted from sort/search.go.
+		h, i, j := 0, 0, sfilen
+		for i < j {
+			h = i + (j-i)/2
+			if ti.sfi[h].encName < name {
+				i = h + 1
+			} else {
+				j = h
+			}
+		}
+		if i < sfilen && ti.sfi[i].encName == name {
+			return i
+		}
+	}
+	return -1
+}
+
+func getTypeInfo(rtid uintptr, rt reflect.Type) (pti *typeInfo) {
+	var ok bool
+	cachedTypeInfoMutex.RLock()
+	pti, ok = cachedTypeInfo[rtid]
+	cachedTypeInfoMutex.RUnlock()
+	if ok {
+		return
+	}
+
+	cachedTypeInfoMutex.Lock()
+	defer cachedTypeInfoMutex.Unlock()
+	if pti, ok = cachedTypeInfo[rtid]; ok {
+		return
+	}
+
+	ti := typeInfo{rt: rt, rtid: rtid}
+	pti = &ti
+
+	var indir int8
+	if ok, indir = implementsIntf(rt, binaryMarshalerTyp); ok {
+		ti.m, ti.mIndir = true, indir
+	}
+	if ok, indir = implementsIntf(rt, binaryUnmarshalerTyp); ok {
+		ti.unm, ti.unmIndir = true, indir
+	}
+	if ok, _ = implementsIntf(rt, mapBySliceTyp); ok {
+		ti.mbs = true
+	}
+
+	pt := rt
+	var ptIndir int8
+	// for ; pt.Kind() == reflect.Ptr; pt, ptIndir = pt.Elem(), ptIndir+1 { }
+	for pt.Kind() == reflect.Ptr {
+		pt = pt.Elem()
+		ptIndir++
+	}
+	if ptIndir == 0 {
+		ti.base = rt
+		ti.baseId = rtid
+	} else {
+		ti.base = pt
+		ti.baseId = reflect.ValueOf(pt).Pointer()
+		ti.baseIndir = ptIndir
+	}
+
+	if rt.Kind() == reflect.Struct {
+		var siInfo *structFieldInfo
+		if f, ok := rt.FieldByName(structInfoFieldName); ok {
+			siInfo = parseStructFieldInfo(structInfoFieldName, f.Tag.Get(structTagName))
+			ti.toArray = siInfo.toArray
+		}
+		sfip := make([]*structFieldInfo, 0, rt.NumField())
+		rgetTypeInfo(rt, nil, make(map[string]bool), &sfip, siInfo)
+
+		// // try to put all si close together
+		// const tryToPutAllStructFieldInfoTogether = true
+		// if tryToPutAllStructFieldInfoTogether {
+		// 	sfip2 := make([]structFieldInfo, len(sfip))
+		// 	for i, si := range sfip {
+		// 		sfip2[i] = *si
+		// 	}
+		// 	for i := range sfip {
+		// 		sfip[i] = &sfip2[i]
+		// 	}
+		// }
+
+		ti.sfip = make([]*structFieldInfo, len(sfip))
+		ti.sfi = make([]*structFieldInfo, len(sfip))
+		copy(ti.sfip, sfip)
+		sort.Sort(sfiSortedByEncName(sfip))
+		copy(ti.sfi, sfip)
+	}
+	// sfi = sfip
+	cachedTypeInfo[rtid] = pti
+	return
+}
+
+func rgetTypeInfo(rt reflect.Type, indexstack []int, fnameToHastag map[string]bool,
+	sfi *[]*structFieldInfo, siInfo *structFieldInfo,
+) {
+	// for rt.Kind() == reflect.Ptr {
+	// 	// indexstack = append(indexstack, 0)
+	// 	rt = rt.Elem()
+	// }
+	for j := 0; j < rt.NumField(); j++ {
+		f := rt.Field(j)
+		stag := f.Tag.Get(structTagName)
+		if stag == "-" {
+			continue
+		}
+		if r1, _ := utf8.DecodeRuneInString(f.Name); r1 == utf8.RuneError || !unicode.IsUpper(r1) {
+			continue
+		}
+		// if anonymous and there is no struct tag and its a struct (or pointer to struct), inline it.
+		if f.Anonymous && stag == "" {
+			ft := f.Type
+			for ft.Kind() == reflect.Ptr {
+				ft = ft.Elem()
+			}
+			if ft.Kind() == reflect.Struct {
+				indexstack2 := append(append(make([]int, 0, len(indexstack)+4), indexstack...), j)
+				rgetTypeInfo(ft, indexstack2, fnameToHastag, sfi, siInfo)
+				continue
+			}
+		}
+		// do not let fields with same name in embedded structs override field at higher level.
+		// this must be done after anonymous check, to allow anonymous field
+		// still include their child fields
+		if _, ok := fnameToHastag[f.Name]; ok {
+			continue
+		}
+		si := parseStructFieldInfo(f.Name, stag)
+		// si.ikind = int(f.Type.Kind())
+		if len(indexstack) == 0 {
+			si.i = int16(j)
+		} else {
+			si.i = -1
+			si.is = append(append(make([]int, 0, len(indexstack)+4), indexstack...), j)
+		}
+
+		if siInfo != nil {
+			if siInfo.omitEmpty {
+				si.omitEmpty = true
+			}
+		}
+		*sfi = append(*sfi, si)
+		fnameToHastag[f.Name] = stag != ""
+	}
+}
+
+func panicToErr(err *error) {
+	if recoverPanicToErr {
+		if x := recover(); x != nil {
+			//debug.PrintStack()
+			panicValToErr(x, err)
+		}
+	}
+}
+
+func doPanic(tag string, format string, params ...interface{}) {
+	params2 := make([]interface{}, len(params)+1)
+	params2[0] = tag
+	copy(params2[1:], params)
+	panic(fmt.Errorf("%s: "+format, params2...))
+}
+
+func checkOverflowFloat32(f float64, doCheck bool) {
+	if !doCheck {
+		return
+	}
+	// check overflow (logic adapted from std pkg reflect/value.go OverflowFloat()
+	f2 := f
+	if f2 < 0 {
+		f2 = -f
+	}
+	if math.MaxFloat32 < f2 && f2 <= math.MaxFloat64 {
+		decErr("Overflow float32 value: %v", f2)
+	}
+}
+
+func checkOverflow(ui uint64, i int64, bitsize uint8) {
+	// check overflow (logic adapted from std pkg reflect/value.go OverflowUint()
+	if bitsize == 0 {
+		return
+	}
+	if i != 0 {
+		if trunc := (i << (64 - bitsize)) >> (64 - bitsize); i != trunc {
+			decErr("Overflow int value: %v", i)
+		}
+	}
+	if ui != 0 {
+		if trunc := (ui << (64 - bitsize)) >> (64 - bitsize); ui != trunc {
+			decErr("Overflow uint value: %v", ui)
+		}
+	}
+}

vendor/src/github.com/hashicorp/go-msgpack/codec/helper_internal.go

@@ -0,0 +1,127 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+package codec
+
+// All non-std package dependencies live in this file,
+// so porting to different environment is easy (just update functions).
+
+import (
+	"errors"
+	"fmt"
+	"math"
+	"reflect"
+)
+
+var (
+	raisePanicAfterRecover = false
+	debugging              = true
+)
+
+func panicValToErr(panicVal interface{}, err *error) {
+	switch xerr := panicVal.(type) {
+	case error:
+		*err = xerr
+	case string:
+		*err = errors.New(xerr)
+	default:
+		*err = fmt.Errorf("%v", panicVal)
+	}
+	if raisePanicAfterRecover {
+		panic(panicVal)
+	}
+	return
+}
+
+func isEmptyValueDeref(v reflect.Value, deref bool) bool {
+	switch v.Kind() {
+	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
+		return v.Len() == 0
+	case reflect.Bool:
+		return !v.Bool()
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return v.Int() == 0
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return v.Uint() == 0
+	case reflect.Float32, reflect.Float64:
+		return v.Float() == 0
+	case reflect.Interface, reflect.Ptr:
+		if deref {
+			if v.IsNil() {
+				return true
+			}
+			return isEmptyValueDeref(v.Elem(), deref)
+		} else {
+			return v.IsNil()
+		}
+	case reflect.Struct:
+		// return true if all fields are empty. else return false.
+
+		// we cannot use equality check, because some fields may be maps/slices/etc
+		// and consequently the structs are not comparable.
+		// return v.Interface() == reflect.Zero(v.Type()).Interface()
+		for i, n := 0, v.NumField(); i < n; i++ {
+			if !isEmptyValueDeref(v.Field(i), deref) {
+				return false
+			}
+		}
+		return true
+	}
+	return false
+}
+
+func isEmptyValue(v reflect.Value) bool {
+	return isEmptyValueDeref(v, true)
+}
+
+func debugf(format string, args ...interface{}) {
+	if debugging {
+		if len(format) == 0 || format[len(format)-1] != '\n' {
+			format = format + "\n"
+		}
+		fmt.Printf(format, args...)
+	}
+}
+
+func pruneSignExt(v []byte, pos bool) (n int) {
+	if len(v) < 2 {
+	} else if pos && v[0] == 0 {
+		for ; v[n] == 0 && n+1 < len(v) && (v[n+1]&(1<<7) == 0); n++ {
+		}
+	} else if !pos && v[0] == 0xff {
+		for ; v[n] == 0xff && n+1 < len(v) && (v[n+1]&(1<<7) != 0); n++ {
+		}
+	}
+	return
+}
+
+func implementsIntf(typ, iTyp reflect.Type) (success bool, indir int8) {
+	if typ == nil {
+		return
+	}
+	rt := typ
+	// The type might be a pointer and we need to keep
+	// dereferencing to the base type until we find an implementation.
+	for {
+		if rt.Implements(iTyp) {
+			return true, indir
+		}
+		if p := rt; p.Kind() == reflect.Ptr {
+			indir++
+			if indir >= math.MaxInt8 { // insane number of indirections
+				return false, 0
+			}
+			rt = p.Elem()
+			continue
+		}
+		break
+	}
+	// No luck yet, but if this is a base type (non-pointer), the pointer might satisfy.
+	if typ.Kind() != reflect.Ptr {
+		// Not a pointer, but does the pointer work?
+		if reflect.PtrTo(typ).Implements(iTyp) {
+			return true, -1
+		}
+	}
+	return false, 0
+}

vendor/src/github.com/hashicorp/go-msgpack/codec/msgpack.go

@@ -0,0 +1,816 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+/*
+MSGPACK
+
+Msgpack-c implementation powers the c, c++, python, ruby, etc libraries.
+We need to maintain compatibility with it and how it encodes integer values
+without caring about the type.
+
+For compatibility with behaviour of msgpack-c reference implementation:
+  - Go intX (>0) and uintX
+       IS ENCODED AS
+    msgpack +ve fixnum, unsigned
+  - Go intX (<0)
+       IS ENCODED AS
+    msgpack -ve fixnum, signed
+
+*/
+package codec
+
+import (
+	"fmt"
+	"io"
+	"math"
+	"net/rpc"
+)
+
+const (
+	mpPosFixNumMin byte = 0x00
+	mpPosFixNumMax      = 0x7f
+	mpFixMapMin         = 0x80
+	mpFixMapMax         = 0x8f
+	mpFixArrayMin       = 0x90
+	mpFixArrayMax       = 0x9f
+	mpFixStrMin         = 0xa0
+	mpFixStrMax         = 0xbf
+	mpNil               = 0xc0
+	_                   = 0xc1
+	mpFalse             = 0xc2
+	mpTrue              = 0xc3
+	mpFloat             = 0xca
+	mpDouble            = 0xcb
+	mpUint8             = 0xcc
+	mpUint16            = 0xcd
+	mpUint32            = 0xce
+	mpUint64            = 0xcf
+	mpInt8              = 0xd0
+	mpInt16             = 0xd1
+	mpInt32             = 0xd2
+	mpInt64             = 0xd3
+
+	// extensions below
+	mpBin8     = 0xc4
+	mpBin16    = 0xc5
+	mpBin32    = 0xc6
+	mpExt8     = 0xc7
+	mpExt16    = 0xc8
+	mpExt32    = 0xc9
+	mpFixExt1  = 0xd4
+	mpFixExt2  = 0xd5
+	mpFixExt4  = 0xd6
+	mpFixExt8  = 0xd7
+	mpFixExt16 = 0xd8
+
+	mpStr8  = 0xd9 // new
+	mpStr16 = 0xda
+	mpStr32 = 0xdb
+
+	mpArray16 = 0xdc
+	mpArray32 = 0xdd
+
+	mpMap16 = 0xde
+	mpMap32 = 0xdf
+
+	mpNegFixNumMin = 0xe0
+	mpNegFixNumMax = 0xff
+)
+
+// MsgpackSpecRpcMultiArgs is a special type which signifies to the MsgpackSpecRpcCodec
+// that the backend RPC service takes multiple arguments, which have been arranged
+// in sequence in the slice.
+//
+// The Codec then passes it AS-IS to the rpc service (without wrapping it in an
+// array of 1 element).
+type MsgpackSpecRpcMultiArgs []interface{}
+
+// A MsgpackContainer type specifies the different types of msgpackContainers.
+type msgpackContainerType struct {
+	fixCutoff                   int
+	bFixMin, b8, b16, b32       byte
+	hasFixMin, has8, has8Always bool
+}
+
+var (
+	msgpackContainerStr  = msgpackContainerType{32, mpFixStrMin, mpStr8, mpStr16, mpStr32, true, true, false}
+	msgpackContainerBin  = msgpackContainerType{0, 0, mpBin8, mpBin16, mpBin32, false, true, true}
+	msgpackContainerList = msgpackContainerType{16, mpFixArrayMin, 0, mpArray16, mpArray32, true, false, false}
+	msgpackContainerMap  = msgpackContainerType{16, mpFixMapMin, 0, mpMap16, mpMap32, true, false, false}
+)
+
+//---------------------------------------------
+
+type msgpackEncDriver struct {
+	w encWriter
+	h *MsgpackHandle
+}
+
+func (e *msgpackEncDriver) isBuiltinType(rt uintptr) bool {
+	//no builtin types. All encodings are based on kinds. Types supported as extensions.
+	return false
+}
+
+func (e *msgpackEncDriver) encodeBuiltin(rt uintptr, v interface{}) {}
+
+func (e *msgpackEncDriver) encodeNil() {
+	e.w.writen1(mpNil)
+}
+
+func (e *msgpackEncDriver) encodeInt(i int64) {
+
+	switch {
+	case i >= 0:
+		e.encodeUint(uint64(i))
+	case i >= -32:
+		e.w.writen1(byte(i))
+	case i >= math.MinInt8:
+		e.w.writen2(mpInt8, byte(i))
+	case i >= math.MinInt16:
+		e.w.writen1(mpInt16)
+		e.w.writeUint16(uint16(i))
+	case i >= math.MinInt32:
+		e.w.writen1(mpInt32)
+		e.w.writeUint32(uint32(i))
+	default:
+		e.w.writen1(mpInt64)
+		e.w.writeUint64(uint64(i))
+	}
+}
+
+func (e *msgpackEncDriver) encodeUint(i uint64) {
+	switch {
+	case i <= math.MaxInt8:
+		e.w.writen1(byte(i))
+	case i <= math.MaxUint8:
+		e.w.writen2(mpUint8, byte(i))
+	case i <= math.MaxUint16:
+		e.w.writen1(mpUint16)
+		e.w.writeUint16(uint16(i))
+	case i <= math.MaxUint32:
+		e.w.writen1(mpUint32)
+		e.w.writeUint32(uint32(i))
+	default:
+		e.w.writen1(mpUint64)
+		e.w.writeUint64(uint64(i))
+	}
+}
+
+func (e *msgpackEncDriver) encodeBool(b bool) {
+	if b {
+		e.w.writen1(mpTrue)
+	} else {
+		e.w.writen1(mpFalse)
+	}
+}
+
+func (e *msgpackEncDriver) encodeFloat32(f float32) {
+	e.w.writen1(mpFloat)
+	e.w.writeUint32(math.Float32bits(f))
+}
+
+func (e *msgpackEncDriver) encodeFloat64(f float64) {
+	e.w.writen1(mpDouble)
+	e.w.writeUint64(math.Float64bits(f))
+}
+
+func (e *msgpackEncDriver) encodeExtPreamble(xtag byte, l int) {
+	switch {
+	case l == 1:
+		e.w.writen2(mpFixExt1, xtag)
+	case l == 2:
+		e.w.writen2(mpFixExt2, xtag)
+	case l == 4:
+		e.w.writen2(mpFixExt4, xtag)
+	case l == 8:
+		e.w.writen2(mpFixExt8, xtag)
+	case l == 16:
+		e.w.writen2(mpFixExt16, xtag)
+	case l < 256:
+		e.w.writen2(mpExt8, byte(l))
+		e.w.writen1(xtag)
+	case l < 65536:
+		e.w.writen1(mpExt16)
+		e.w.writeUint16(uint16(l))
+		e.w.writen1(xtag)
+	default:
+		e.w.writen1(mpExt32)
+		e.w.writeUint32(uint32(l))
+		e.w.writen1(xtag)
+	}
+}
+
+func (e *msgpackEncDriver) encodeArrayPreamble(length int) {
+	e.writeContainerLen(msgpackContainerList, length)
+}
+
+func (e *msgpackEncDriver) encodeMapPreamble(length int) {
+	e.writeContainerLen(msgpackContainerMap, length)
+}
+
+func (e *msgpackEncDriver) encodeString(c charEncoding, s string) {
+	if c == c_RAW && e.h.WriteExt {
+		e.writeContainerLen(msgpackContainerBin, len(s))
+	} else {
+		e.writeContainerLen(msgpackContainerStr, len(s))
+	}
+	if len(s) > 0 {
+		e.w.writestr(s)
+	}
+}
+
+func (e *msgpackEncDriver) encodeSymbol(v string) {
+	e.encodeString(c_UTF8, v)
+}
+
+func (e *msgpackEncDriver) encodeStringBytes(c charEncoding, bs []byte) {
+	if c == c_RAW && e.h.WriteExt {
+		e.writeContainerLen(msgpackContainerBin, len(bs))
+	} else {
+		e.writeContainerLen(msgpackContainerStr, len(bs))
+	}
+	if len(bs) > 0 {
+		e.w.writeb(bs)
+	}
+}
+
+func (e *msgpackEncDriver) writeContainerLen(ct msgpackContainerType, l int) {
+	switch {
+	case ct.hasFixMin && l < ct.fixCutoff:
+		e.w.writen1(ct.bFixMin | byte(l))
+	case ct.has8 && l < 256 && (ct.has8Always || e.h.WriteExt):
+		e.w.writen2(ct.b8, uint8(l))
+	case l < 65536:
+		e.w.writen1(ct.b16)
+		e.w.writeUint16(uint16(l))
+	default:
+		e.w.writen1(ct.b32)
+		e.w.writeUint32(uint32(l))
+	}
+}
+
+//---------------------------------------------
+
+type msgpackDecDriver struct {
+	r      decReader
+	h      *MsgpackHandle
+	bd     byte
+	bdRead bool
+	bdType valueType
+}
+
+func (d *msgpackDecDriver) isBuiltinType(rt uintptr) bool {
+	//no builtin types. All encodings are based on kinds. Types supported as extensions.
+	return false
+}
+
+func (d *msgpackDecDriver) decodeBuiltin(rt uintptr, v interface{}) {}
+
+// Note: This returns either a primitive (int, bool, etc) for non-containers,
+// or a containerType, or a specific type denoting nil or extension.
+// It is called when a nil interface{} is passed, leaving it up to the DecDriver
+// to introspect the stream and decide how best to decode.
+// It deciphers the value by looking at the stream first.
+func (d *msgpackDecDriver) decodeNaked() (v interface{}, vt valueType, decodeFurther bool) {
+	d.initReadNext()
+	bd := d.bd
+
+	switch bd {
+	case mpNil:
+		vt = valueTypeNil
+		d.bdRead = false
+	case mpFalse:
+		vt = valueTypeBool
+		v = false
+	case mpTrue:
+		vt = valueTypeBool
+		v = true
+
+	case mpFloat:
+		vt = valueTypeFloat
+		v = float64(math.Float32frombits(d.r.readUint32()))
+	case mpDouble:
+		vt = valueTypeFloat
+		v = math.Float64frombits(d.r.readUint64())
+
+	case mpUint8:
+		vt = valueTypeUint
+		v = uint64(d.r.readn1())
+	case mpUint16:
+		vt = valueTypeUint
+		v = uint64(d.r.readUint16())
+	case mpUint32:
+		vt = valueTypeUint
+		v = uint64(d.r.readUint32())
+	case mpUint64:
+		vt = valueTypeUint
+		v = uint64(d.r.readUint64())
+
+	case mpInt8:
+		vt = valueTypeInt
+		v = int64(int8(d.r.readn1()))
+	case mpInt16:
+		vt = valueTypeInt
+		v = int64(int16(d.r.readUint16()))
+	case mpInt32:
+		vt = valueTypeInt
+		v = int64(int32(d.r.readUint32()))
+	case mpInt64:
+		vt = valueTypeInt
+		v = int64(int64(d.r.readUint64()))
+
+	default:
+		switch {
+		case bd >= mpPosFixNumMin && bd <= mpPosFixNumMax:
+			// positive fixnum (always signed)
+			vt = valueTypeInt
+			v = int64(int8(bd))
+		case bd >= mpNegFixNumMin && bd <= mpNegFixNumMax:
+			// negative fixnum
+			vt = valueTypeInt
+			v = int64(int8(bd))
+		case bd == mpStr8, bd == mpStr16, bd == mpStr32, bd >= mpFixStrMin && bd <= mpFixStrMax:
+			if d.h.RawToString {
+				var rvm string
+				vt = valueTypeString
+				v = &rvm
+			} else {
+				var rvm = []byte{}
+				vt = valueTypeBytes
+				v = &rvm
+			}
+			decodeFurther = true
+		case bd == mpBin8, bd == mpBin16, bd == mpBin32:
+			var rvm = []byte{}
+			vt = valueTypeBytes
+			v = &rvm
+			decodeFurther = true
+		case bd == mpArray16, bd == mpArray32, bd >= mpFixArrayMin && bd <= mpFixArrayMax:
+			vt = valueTypeArray
+			decodeFurther = true
+		case bd == mpMap16, bd == mpMap32, bd >= mpFixMapMin && bd <= mpFixMapMax:
+			vt = valueTypeMap
+			decodeFurther = true
+		case bd >= mpFixExt1 && bd <= mpFixExt16, bd >= mpExt8 && bd <= mpExt32:
+			clen := d.readExtLen()
+			var re RawExt
+			re.Tag = d.r.readn1()
+			re.Data = d.r.readn(clen)
+			v = &re
+			vt = valueTypeExt
+		default:
+			decErr("Nil-Deciphered DecodeValue: %s: hex: %x, dec: %d", msgBadDesc, bd, bd)
+		}
+	}
+	if !decodeFurther {
+		d.bdRead = false
+	}
+	return
+}
+
+// int can be decoded from msgpack type: intXXX or uintXXX
+func (d *msgpackDecDriver) decodeInt(bitsize uint8) (i int64) {
+	switch d.bd {
+	case mpUint8:
+		i = int64(uint64(d.r.readn1()))
+	case mpUint16:
+		i = int64(uint64(d.r.readUint16()))
+	case mpUint32:
+		i = int64(uint64(d.r.readUint32()))
+	case mpUint64:
+		i = int64(d.r.readUint64())
+	case mpInt8:
+		i = int64(int8(d.r.readn1()))
+	case mpInt16:
+		i = int64(int16(d.r.readUint16()))
+	case mpInt32:
+		i = int64(int32(d.r.readUint32()))
+	case mpInt64:
+		i = int64(d.r.readUint64())
+	default:
+		switch {
+		case d.bd >= mpPosFixNumMin && d.bd <= mpPosFixNumMax:
+			i = int64(int8(d.bd))
+		case d.bd >= mpNegFixNumMin && d.bd <= mpNegFixNumMax:
+			i = int64(int8(d.bd))
+		default:
+			decErr("Unhandled single-byte unsigned integer value: %s: %x", msgBadDesc, d.bd)
+		}
+	}
+	// check overflow (logic adapted from std pkg reflect/value.go OverflowUint()
+	if bitsize > 0 {
+		if trunc := (i << (64 - bitsize)) >> (64 - bitsize); i != trunc {
+			decErr("Overflow int value: %v", i)
+		}
+	}
+	d.bdRead = false
+	return
+}
+
+// uint can be decoded from msgpack type: intXXX or uintXXX
+func (d *msgpackDecDriver) decodeUint(bitsize uint8) (ui uint64) {
+	switch d.bd {
+	case mpUint8:
+		ui = uint64(d.r.readn1())
+	case mpUint16:
+		ui = uint64(d.r.readUint16())
+	case mpUint32:
+		ui = uint64(d.r.readUint32())
+	case mpUint64:
+		ui = d.r.readUint64()
+	case mpInt8:
+		if i := int64(int8(d.r.readn1())); i >= 0 {
+			ui = uint64(i)
+		} else {
+			decErr("Assigning negative signed value: %v, to unsigned type", i)
+		}
+	case mpInt16:
+		if i := int64(int16(d.r.readUint16())); i >= 0 {
+			ui = uint64(i)
+		} else {
+			decErr("Assigning negative signed value: %v, to unsigned type", i)
+		}
+	case mpInt32:
+		if i := int64(int32(d.r.readUint32())); i >= 0 {
+			ui = uint64(i)
+		} else {
+			decErr("Assigning negative signed value: %v, to unsigned type", i)
+		}
+	case mpInt64:
+		if i := int64(d.r.readUint64()); i >= 0 {
+			ui = uint64(i)
+		} else {
+			decErr("Assigning negative signed value: %v, to unsigned type", i)
+		}
+	default:
+		switch {
+		case d.bd >= mpPosFixNumMin && d.bd <= mpPosFixNumMax:
+			ui = uint64(d.bd)
+		case d.bd >= mpNegFixNumMin && d.bd <= mpNegFixNumMax:
+			decErr("Assigning negative signed value: %v, to unsigned type", int(d.bd))
+		default:
+			decErr("Unhandled single-byte unsigned integer value: %s: %x", msgBadDesc, d.bd)
+		}
+	}
+	// check overflow (logic adapted from std pkg reflect/value.go OverflowUint()
+	if bitsize > 0 {
+		if trunc := (ui << (64 - bitsize)) >> (64 - bitsize); ui != trunc {
+			decErr("Overflow uint value: %v", ui)
+		}
+	}
+	d.bdRead = false
+	return
+}
+
+// float can either be decoded from msgpack type: float, double or intX
+func (d *msgpackDecDriver) decodeFloat(chkOverflow32 bool) (f float64) {
+	switch d.bd {
+	case mpFloat:
+		f = float64(math.Float32frombits(d.r.readUint32()))
+	case mpDouble:
+		f = math.Float64frombits(d.r.readUint64())
+	default:
+		f = float64(d.decodeInt(0))
+	}
+	checkOverflowFloat32(f, chkOverflow32)
+	d.bdRead = false
+	return
+}
+
+// bool can be decoded from bool, fixnum 0 or 1.
+func (d *msgpackDecDriver) decodeBool() (b bool) {
+	switch d.bd {
+	case mpFalse, 0:
+		// b = false
+	case mpTrue, 1:
+		b = true
+	default:
+		decErr("Invalid single-byte value for bool: %s: %x", msgBadDesc, d.bd)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *msgpackDecDriver) decodeString() (s string) {
+	clen := d.readContainerLen(msgpackContainerStr)
+	if clen > 0 {
+		s = string(d.r.readn(clen))
+	}
+	d.bdRead = false
+	return
+}
+
+// Callers must check if changed=true (to decide whether to replace the one they have)
+func (d *msgpackDecDriver) decodeBytes(bs []byte) (bsOut []byte, changed bool) {
+	// bytes can be decoded from msgpackContainerStr or msgpackContainerBin
+	var clen int
+	switch d.bd {
+	case mpBin8, mpBin16, mpBin32:
+		clen = d.readContainerLen(msgpackContainerBin)
+	default:
+		clen = d.readContainerLen(msgpackContainerStr)
+	}
+	// if clen < 0 {
+	// 	changed = true
+	// 	panic("length cannot be zero. this cannot be nil.")
+	// }
+	if clen > 0 {
+		// if no contents in stream, don't update the passed byteslice
+		if len(bs) != clen {
+			// Return changed=true if length of passed slice diff from length of bytes in stream
+			if len(bs) > clen {
+				bs = bs[:clen]
+			} else {
+				bs = make([]byte, clen)
+			}
+			bsOut = bs
+			changed = true
+		}
+		d.r.readb(bs)
+	}
+	d.bdRead = false
+	return
+}
+
+// Every top-level decode funcs (i.e. decodeValue, decode) must call this first.
+func (d *msgpackDecDriver) initReadNext() {
+	if d.bdRead {
+		return
+	}
+	d.bd = d.r.readn1()
+	d.bdRead = true
+	d.bdType = valueTypeUnset
+}
+
+func (d *msgpackDecDriver) currentEncodedType() valueType {
+	if d.bdType == valueTypeUnset {
+		bd := d.bd
+		switch bd {
+		case mpNil:
+			d.bdType = valueTypeNil
+		case mpFalse, mpTrue:
+			d.bdType = valueTypeBool
+		case mpFloat, mpDouble:
+			d.bdType = valueTypeFloat
+		case mpUint8, mpUint16, mpUint32, mpUint64:
+			d.bdType = valueTypeUint
+		case mpInt8, mpInt16, mpInt32, mpInt64:
+			d.bdType = valueTypeInt
+		default:
+			switch {
+			case bd >= mpPosFixNumMin && bd <= mpPosFixNumMax:
+				d.bdType = valueTypeInt
+			case bd >= mpNegFixNumMin && bd <= mpNegFixNumMax:
+				d.bdType = valueTypeInt
+			case bd == mpStr8, bd == mpStr16, bd == mpStr32, bd >= mpFixStrMin && bd <= mpFixStrMax:
+				if d.h.RawToString {
+					d.bdType = valueTypeString
+				} else {
+					d.bdType = valueTypeBytes
+				}
+			case bd == mpBin8, bd == mpBin16, bd == mpBin32:
+				d.bdType = valueTypeBytes
+			case bd == mpArray16, bd == mpArray32, bd >= mpFixArrayMin && bd <= mpFixArrayMax:
+				d.bdType = valueTypeArray
+			case bd == mpMap16, bd == mpMap32, bd >= mpFixMapMin && bd <= mpFixMapMax:
+				d.bdType = valueTypeMap
+			case bd >= mpFixExt1 && bd <= mpFixExt16, bd >= mpExt8 && bd <= mpExt32:
+				d.bdType = valueTypeExt
+			default:
+				decErr("currentEncodedType: Undeciphered descriptor: %s: hex: %x, dec: %d", msgBadDesc, bd, bd)
+			}
+		}
+	}
+	return d.bdType
+}
+
+func (d *msgpackDecDriver) tryDecodeAsNil() bool {
+	if d.bd == mpNil {
+		d.bdRead = false
+		return true
+	}
+	return false
+}
+
+func (d *msgpackDecDriver) readContainerLen(ct msgpackContainerType) (clen int) {
+	bd := d.bd
+	switch {
+	case bd == mpNil:
+		clen = -1 // to represent nil
+	case bd == ct.b8:
+		clen = int(d.r.readn1())
+	case bd == ct.b16:
+		clen = int(d.r.readUint16())
+	case bd == ct.b32:
+		clen = int(d.r.readUint32())
+	case (ct.bFixMin & bd) == ct.bFixMin:
+		clen = int(ct.bFixMin ^ bd)
+	default:
+		decErr("readContainerLen: %s: hex: %x, dec: %d", msgBadDesc, bd, bd)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *msgpackDecDriver) readMapLen() int {
+	return d.readContainerLen(msgpackContainerMap)
+}
+
+func (d *msgpackDecDriver) readArrayLen() int {
+	return d.readContainerLen(msgpackContainerList)
+}
+
+func (d *msgpackDecDriver) readExtLen() (clen int) {
+	switch d.bd {
+	case mpNil:
+		clen = -1 // to represent nil
+	case mpFixExt1:
+		clen = 1
+	case mpFixExt2:
+		clen = 2
+	case mpFixExt4:
+		clen = 4
+	case mpFixExt8:
+		clen = 8
+	case mpFixExt16:
+		clen = 16
+	case mpExt8:
+		clen = int(d.r.readn1())
+	case mpExt16:
+		clen = int(d.r.readUint16())
+	case mpExt32:
+		clen = int(d.r.readUint32())
+	default:
+		decErr("decoding ext bytes: found unexpected byte: %x", d.bd)
+	}
+	return
+}
+
+func (d *msgpackDecDriver) decodeExt(verifyTag bool, tag byte) (xtag byte, xbs []byte) {
+	xbd := d.bd
+	switch {
+	case xbd == mpBin8, xbd == mpBin16, xbd == mpBin32:
+		xbs, _ = d.decodeBytes(nil)
+	case xbd == mpStr8, xbd == mpStr16, xbd == mpStr32,
+		xbd >= mpFixStrMin && xbd <= mpFixStrMax:
+		xbs = []byte(d.decodeString())
+	default:
+		clen := d.readExtLen()
+		xtag = d.r.readn1()
+		if verifyTag && xtag != tag {
+			decErr("Wrong extension tag. Got %b. Expecting: %v", xtag, tag)
+		}
+		xbs = d.r.readn(clen)
+	}
+	d.bdRead = false
+	return
+}
+
+//--------------------------------------------------
+
+//MsgpackHandle is a Handle for the Msgpack Schema-Free Encoding Format.
+type MsgpackHandle struct {
+	BasicHandle
+
+	// RawToString controls how raw bytes are decoded into a nil interface{}.
+	RawToString bool
+	// WriteExt flag supports encoding configured extensions with extension tags.
+	// It also controls whether other elements of the new spec are encoded (ie Str8).
+	//
+	// With WriteExt=false, configured extensions are serialized as raw bytes
+	// and Str8 is not encoded.
+	//
+	// A stream can still be decoded into a typed value, provided an appropriate value
+	// is provided, but the type cannot be inferred from the stream. If no appropriate
+	// type is provided (e.g. decoding into a nil interface{}), you get back
+	// a []byte or string based on the setting of RawToString.
+	WriteExt bool
+}
+
+func (h *MsgpackHandle) newEncDriver(w encWriter) encDriver {
+	return &msgpackEncDriver{w: w, h: h}
+}
+
+func (h *MsgpackHandle) newDecDriver(r decReader) decDriver {
+	return &msgpackDecDriver{r: r, h: h}
+}
+
+func (h *MsgpackHandle) writeExt() bool {
+	return h.WriteExt
+}
+
+func (h *MsgpackHandle) getBasicHandle() *BasicHandle {
+	return &h.BasicHandle
+}
+
+//--------------------------------------------------
+
+type msgpackSpecRpcCodec struct {
+	rpcCodec
+}
+
+// /////////////// Spec RPC Codec ///////////////////
+func (c *msgpackSpecRpcCodec) WriteRequest(r *rpc.Request, body interface{}) error {
+	// WriteRequest can write to both a Go service, and other services that do
+	// not abide by the 1 argument rule of a Go service.
+	// We discriminate based on if the body is a MsgpackSpecRpcMultiArgs
+	var bodyArr []interface{}
+	if m, ok := body.(MsgpackSpecRpcMultiArgs); ok {
+		bodyArr = ([]interface{})(m)
+	} else {
+		bodyArr = []interface{}{body}
+	}
+	r2 := []interface{}{0, uint32(r.Seq), r.ServiceMethod, bodyArr}
+	return c.write(r2, nil, false, true)
+}
+
+func (c *msgpackSpecRpcCodec) WriteResponse(r *rpc.Response, body interface{}) error {
+	var moe interface{}
+	if r.Error != "" {
+		moe = r.Error
+	}
+	if moe != nil && body != nil {
+		body = nil
+	}
+	r2 := []interface{}{1, uint32(r.Seq), moe, body}
+	return c.write(r2, nil, false, true)
+}
+
+func (c *msgpackSpecRpcCodec) ReadResponseHeader(r *rpc.Response) error {
+	return c.parseCustomHeader(1, &r.Seq, &r.Error)
+}
+
+func (c *msgpackSpecRpcCodec) ReadRequestHeader(r *rpc.Request) error {
+	return c.parseCustomHeader(0, &r.Seq, &r.ServiceMethod)
+}
+
+func (c *msgpackSpecRpcCodec) ReadRequestBody(body interface{}) error {
+	if body == nil { // read and discard
+		return c.read(nil)
+	}
+	bodyArr := []interface{}{body}
+	return c.read(&bodyArr)
+}
+
+func (c *msgpackSpecRpcCodec) parseCustomHeader(expectTypeByte byte, msgid *uint64, methodOrError *string) (err error) {
+
+	if c.cls {
+		return io.EOF
+	}
+
+	// We read the response header by hand
+	// so that the body can be decoded on its own from the stream at a later time.
+
+	const fia byte = 0x94 //four item array descriptor value
+	// Not sure why the panic of EOF is swallowed above.
+	// if bs1 := c.dec.r.readn1(); bs1 != fia {
+	// 	err = fmt.Errorf("Unexpected value for array descriptor: Expecting %v. Received %v", fia, bs1)
+	// 	return
+	// }
+	var b byte
+	b, err = c.br.ReadByte()
+	if err != nil {
+		return
+	}
+	if b != fia {
+		err = fmt.Errorf("Unexpected value for array descriptor: Expecting %v. Received %v", fia, b)
+		return
+	}
+
+	if err = c.read(&b); err != nil {
+		return
+	}
+	if b != expectTypeByte {
+		err = fmt.Errorf("Unexpected byte descriptor in header. Expecting %v. Received %v", expectTypeByte, b)
+		return
+	}
+	if err = c.read(msgid); err != nil {
+		return
+	}
+	if err = c.read(methodOrError); err != nil {
+		return
+	}
+	return
+}
+
+//--------------------------------------------------
+
+// msgpackSpecRpc is the implementation of Rpc that uses custom communication protocol
+// as defined in the msgpack spec at https://github.com/msgpack-rpc/msgpack-rpc/blob/master/spec.md
+type msgpackSpecRpc struct{}
+
+// MsgpackSpecRpc implements Rpc using the communication protocol defined in
+// the msgpack spec at https://github.com/msgpack-rpc/msgpack-rpc/blob/master/spec.md .
+// Its methods (ServerCodec and ClientCodec) return values that implement RpcCodecBuffered.
+var MsgpackSpecRpc msgpackSpecRpc
+
+func (x msgpackSpecRpc) ServerCodec(conn io.ReadWriteCloser, h Handle) rpc.ServerCodec {
+	return &msgpackSpecRpcCodec{newRPCCodec(conn, h)}
+}
+
+func (x msgpackSpecRpc) ClientCodec(conn io.ReadWriteCloser, h Handle) rpc.ClientCodec {
+	return &msgpackSpecRpcCodec{newRPCCodec(conn, h)}
+}
+
+var _ decDriver = (*msgpackDecDriver)(nil)
+var _ encDriver = (*msgpackEncDriver)(nil)

vendor/src/github.com/hashicorp/go-msgpack/codec/msgpack_test.py

@@ -0,0 +1,110 @@
+#!/usr/bin/env python
+
+# This will create golden files in a directory passed to it.
+# A Test calls this internally to create the golden files
+# So it can process them (so we don't have to checkin the files).
+
+import msgpack, msgpackrpc, sys, os, threading
+
+def get_test_data_list():
+    # get list with all primitive types, and a combo type
+    l0 = [ 
+        -8,
+         -1616,
+         -32323232,
+         -6464646464646464,
+         192,
+         1616,
+         32323232,
+         6464646464646464,
+         192,
+         -3232.0,
+         -6464646464.0,
+         3232.0,
+         6464646464.0,
+         False,
+         True,
+         None,
+         "someday",
+         "",
+         "bytestring",
+         1328176922000002000,
+         -2206187877999998000,
+         0,
+         -6795364578871345152
+         ]
+    l1 = [
+        { "true": True,
+          "false": False },
+        { "true": "True",
+          "false": False,
+          "uint16(1616)": 1616 },
+        { "list": [1616, 32323232, True, -3232.0, {"TRUE":True, "FALSE":False}, [True, False] ],
+          "int32":32323232, "bool": True, 
+          "LONG STRING": "123456789012345678901234567890123456789012345678901234567890",
+          "SHORT STRING": "1234567890" },	
+        { True: "true", 8: False, "false": 0 }
+        ]
+    
+    l = []
+    l.extend(l0)
+    l.append(l0)
+    l.extend(l1)
+    return l
+
+def build_test_data(destdir):
+    l = get_test_data_list()
+    for i in range(len(l)):
+        packer = msgpack.Packer()
+        serialized = packer.pack(l[i])
+        f = open(os.path.join(destdir, str(i) + '.golden'), 'wb')
+        f.write(serialized)
+        f.close()
+
+def doRpcServer(port, stopTimeSec):
+    class EchoHandler(object):
+        def Echo123(self, msg1, msg2, msg3):
+            return ("1:%s 2:%s 3:%s" % (msg1, msg2, msg3))
+        def EchoStruct(self, msg):
+            return ("%s" % msg)
+    
+    addr = msgpackrpc.Address('localhost', port)
+    server = msgpackrpc.Server(EchoHandler())
+    server.listen(addr)
+    # run thread to stop it after stopTimeSec seconds if > 0
+    if stopTimeSec > 0:
+        def myStopRpcServer():
+            server.stop()
+        t = threading.Timer(stopTimeSec, myStopRpcServer)
+        t.start()
+    server.start()
+
+def doRpcClientToPythonSvc(port):
+    address = msgpackrpc.Address('localhost', port)
+    client = msgpackrpc.Client(address, unpack_encoding='utf-8')
+    print client.call("Echo123", "A1", "B2", "C3")
+    print client.call("EchoStruct", {"A" :"Aa", "B":"Bb", "C":"Cc"})
+   
+def doRpcClientToGoSvc(port):
+    # print ">>>> port: ", port, " <<<<<"
+    address = msgpackrpc.Address('localhost', port)
+    client = msgpackrpc.Client(address, unpack_encoding='utf-8')
+    print client.call("TestRpcInt.Echo123", ["A1", "B2", "C3"])
+    print client.call("TestRpcInt.EchoStruct", {"A" :"Aa", "B":"Bb", "C":"Cc"})
+
+def doMain(args):
+    if len(args) == 2 and args[0] == "testdata":
+        build_test_data(args[1])
+    elif len(args) == 3 and args[0] == "rpc-server":
+        doRpcServer(int(args[1]), int(args[2]))
+    elif len(args) == 2 and args[0] == "rpc-client-python-service":
+        doRpcClientToPythonSvc(int(args[1]))
+    elif len(args) == 2 and args[0] == "rpc-client-go-service":
+        doRpcClientToGoSvc(int(args[1]))
+    else:
+        print("Usage: msgpack_test.py " + 
+              "[testdata|rpc-server|rpc-client-python-service|rpc-client-go-service] ...")
+    
+if __name__ == "__main__":
+    doMain(sys.argv[1:])
+

vendor/src/github.com/hashicorp/go-msgpack/codec/rpc.go

@@ -0,0 +1,152 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+package codec
+
+import (
+	"bufio"
+	"io"
+	"net/rpc"
+	"sync"
+)
+
+// Rpc provides a rpc Server or Client Codec for rpc communication.
+type Rpc interface {
+	ServerCodec(conn io.ReadWriteCloser, h Handle) rpc.ServerCodec
+	ClientCodec(conn io.ReadWriteCloser, h Handle) rpc.ClientCodec
+}
+
+// RpcCodecBuffered allows access to the underlying bufio.Reader/Writer
+// used by the rpc connection. It accomodates use-cases where the connection
+// should be used by rpc and non-rpc functions, e.g. streaming a file after
+// sending an rpc response.
+type RpcCodecBuffered interface {
+	BufferedReader() *bufio.Reader
+	BufferedWriter() *bufio.Writer
+}
+
+// -------------------------------------
+
+// rpcCodec defines the struct members and common methods.
+type rpcCodec struct {
+	rwc io.ReadWriteCloser
+	dec *Decoder
+	enc *Encoder
+	bw  *bufio.Writer
+	br  *bufio.Reader
+	mu  sync.Mutex
+	cls bool
+}
+
+func newRPCCodec(conn io.ReadWriteCloser, h Handle) rpcCodec {
+	bw := bufio.NewWriter(conn)
+	br := bufio.NewReader(conn)
+	return rpcCodec{
+		rwc: conn,
+		bw:  bw,
+		br:  br,
+		enc: NewEncoder(bw, h),
+		dec: NewDecoder(br, h),
+	}
+}
+
+func (c *rpcCodec) BufferedReader() *bufio.Reader {
+	return c.br
+}
+
+func (c *rpcCodec) BufferedWriter() *bufio.Writer {
+	return c.bw
+}
+
+func (c *rpcCodec) write(obj1, obj2 interface{}, writeObj2, doFlush bool) (err error) {
+	if c.cls {
+		return io.EOF
+	}
+	if err = c.enc.Encode(obj1); err != nil {
+		return
+	}
+	if writeObj2 {
+		if err = c.enc.Encode(obj2); err != nil {
+			return
+		}
+	}
+	if doFlush && c.bw != nil {
+		return c.bw.Flush()
+	}
+	return
+}
+
+func (c *rpcCodec) read(obj interface{}) (err error) {
+	if c.cls {
+		return io.EOF
+	}
+	//If nil is passed in, we should still attempt to read content to nowhere.
+	if obj == nil {
+		var obj2 interface{}
+		return c.dec.Decode(&obj2)
+	}
+	return c.dec.Decode(obj)
+}
+
+func (c *rpcCodec) Close() error {
+	if c.cls {
+		return io.EOF
+	}
+	c.cls = true
+	return c.rwc.Close()
+}
+
+func (c *rpcCodec) ReadResponseBody(body interface{}) error {
+	return c.read(body)
+}
+
+// -------------------------------------
+
+type goRpcCodec struct {
+	rpcCodec
+}
+
+func (c *goRpcCodec) WriteRequest(r *rpc.Request, body interface{}) error {
+	// Must protect for concurrent access as per API
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.write(r, body, true, true)
+}
+
+func (c *goRpcCodec) WriteResponse(r *rpc.Response, body interface{}) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.write(r, body, true, true)
+}
+
+func (c *goRpcCodec) ReadResponseHeader(r *rpc.Response) error {
+	return c.read(r)
+}
+
+func (c *goRpcCodec) ReadRequestHeader(r *rpc.Request) error {
+	return c.read(r)
+}
+
+func (c *goRpcCodec) ReadRequestBody(body interface{}) error {
+	return c.read(body)
+}
+
+// -------------------------------------
+
+// goRpc is the implementation of Rpc that uses the communication protocol
+// as defined in net/rpc package.
+type goRpc struct{}
+
+// GoRpc implements Rpc using the communication protocol defined in net/rpc package.
+// Its methods (ServerCodec and ClientCodec) return values that implement RpcCodecBuffered.
+var GoRpc goRpc
+
+func (x goRpc) ServerCodec(conn io.ReadWriteCloser, h Handle) rpc.ServerCodec {
+	return &goRpcCodec{newRPCCodec(conn, h)}
+}
+
+func (x goRpc) ClientCodec(conn io.ReadWriteCloser, h Handle) rpc.ClientCodec {
+	return &goRpcCodec{newRPCCodec(conn, h)}
+}
+
+var _ RpcCodecBuffered = (*rpcCodec)(nil) // ensure *rpcCodec implements RpcCodecBuffered

vendor/src/github.com/hashicorp/go-msgpack/codec/simple.go

@@ -0,0 +1,461 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+package codec
+
+import "math"
+
+const (
+	_               uint8 = iota
+	simpleVdNil           = 1
+	simpleVdFalse         = 2
+	simpleVdTrue          = 3
+	simpleVdFloat32       = 4
+	simpleVdFloat64       = 5
+
+	// each lasts for 4 (ie n, n+1, n+2, n+3)
+	simpleVdPosInt = 8
+	simpleVdNegInt = 12
+
+	// containers: each lasts for 4 (ie n, n+1, n+2, ... n+7)
+	simpleVdString    = 216
+	simpleVdByteArray = 224
+	simpleVdArray     = 232
+	simpleVdMap       = 240
+	simpleVdExt       = 248
+)
+
+type simpleEncDriver struct {
+	h *SimpleHandle
+	w encWriter
+	//b [8]byte
+}
+
+func (e *simpleEncDriver) isBuiltinType(rt uintptr) bool {
+	return false
+}
+
+func (e *simpleEncDriver) encodeBuiltin(rt uintptr, v interface{}) {
+}
+
+func (e *simpleEncDriver) encodeNil() {
+	e.w.writen1(simpleVdNil)
+}
+
+func (e *simpleEncDriver) encodeBool(b bool) {
+	if b {
+		e.w.writen1(simpleVdTrue)
+	} else {
+		e.w.writen1(simpleVdFalse)
+	}
+}
+
+func (e *simpleEncDriver) encodeFloat32(f float32) {
+	e.w.writen1(simpleVdFloat32)
+	e.w.writeUint32(math.Float32bits(f))
+}
+
+func (e *simpleEncDriver) encodeFloat64(f float64) {
+	e.w.writen1(simpleVdFloat64)
+	e.w.writeUint64(math.Float64bits(f))
+}
+
+func (e *simpleEncDriver) encodeInt(v int64) {
+	if v < 0 {
+		e.encUint(uint64(-v), simpleVdNegInt)
+	} else {
+		e.encUint(uint64(v), simpleVdPosInt)
+	}
+}
+
+func (e *simpleEncDriver) encodeUint(v uint64) {
+	e.encUint(v, simpleVdPosInt)
+}
+
+func (e *simpleEncDriver) encUint(v uint64, bd uint8) {
+	switch {
+	case v <= math.MaxUint8:
+		e.w.writen2(bd, uint8(v))
+	case v <= math.MaxUint16:
+		e.w.writen1(bd + 1)
+		e.w.writeUint16(uint16(v))
+	case v <= math.MaxUint32:
+		e.w.writen1(bd + 2)
+		e.w.writeUint32(uint32(v))
+	case v <= math.MaxUint64:
+		e.w.writen1(bd + 3)
+		e.w.writeUint64(v)
+	}
+}
+
+func (e *simpleEncDriver) encLen(bd byte, length int) {
+	switch {
+	case length == 0:
+		e.w.writen1(bd)
+	case length <= math.MaxUint8:
+		e.w.writen1(bd + 1)
+		e.w.writen1(uint8(length))
+	case length <= math.MaxUint16:
+		e.w.writen1(bd + 2)
+		e.w.writeUint16(uint16(length))
+	case int64(length) <= math.MaxUint32:
+		e.w.writen1(bd + 3)
+		e.w.writeUint32(uint32(length))
+	default:
+		e.w.writen1(bd + 4)
+		e.w.writeUint64(uint64(length))
+	}
+}
+
+func (e *simpleEncDriver) encodeExtPreamble(xtag byte, length int) {
+	e.encLen(simpleVdExt, length)
+	e.w.writen1(xtag)
+}
+
+func (e *simpleEncDriver) encodeArrayPreamble(length int) {
+	e.encLen(simpleVdArray, length)
+}
+
+func (e *simpleEncDriver) encodeMapPreamble(length int) {
+	e.encLen(simpleVdMap, length)
+}
+
+func (e *simpleEncDriver) encodeString(c charEncoding, v string) {
+	e.encLen(simpleVdString, len(v))
+	e.w.writestr(v)
+}
+
+func (e *simpleEncDriver) encodeSymbol(v string) {
+	e.encodeString(c_UTF8, v)
+}
+
+func (e *simpleEncDriver) encodeStringBytes(c charEncoding, v []byte) {
+	e.encLen(simpleVdByteArray, len(v))
+	e.w.writeb(v)
+}
+
+//------------------------------------
+
+type simpleDecDriver struct {
+	h      *SimpleHandle
+	r      decReader
+	bdRead bool
+	bdType valueType
+	bd     byte
+	//b      [8]byte
+}
+
+func (d *simpleDecDriver) initReadNext() {
+	if d.bdRead {
+		return
+	}
+	d.bd = d.r.readn1()
+	d.bdRead = true
+	d.bdType = valueTypeUnset
+}
+
+func (d *simpleDecDriver) currentEncodedType() valueType {
+	if d.bdType == valueTypeUnset {
+		switch d.bd {
+		case simpleVdNil:
+			d.bdType = valueTypeNil
+		case simpleVdTrue, simpleVdFalse:
+			d.bdType = valueTypeBool
+		case simpleVdPosInt, simpleVdPosInt + 1, simpleVdPosInt + 2, simpleVdPosInt + 3:
+			d.bdType = valueTypeUint
+		case simpleVdNegInt, simpleVdNegInt + 1, simpleVdNegInt + 2, simpleVdNegInt + 3:
+			d.bdType = valueTypeInt
+		case simpleVdFloat32, simpleVdFloat64:
+			d.bdType = valueTypeFloat
+		case simpleVdString, simpleVdString + 1, simpleVdString + 2, simpleVdString + 3, simpleVdString + 4:
+			d.bdType = valueTypeString
+		case simpleVdByteArray, simpleVdByteArray + 1, simpleVdByteArray + 2, simpleVdByteArray + 3, simpleVdByteArray + 4:
+			d.bdType = valueTypeBytes
+		case simpleVdExt, simpleVdExt + 1, simpleVdExt + 2, simpleVdExt + 3, simpleVdExt + 4:
+			d.bdType = valueTypeExt
+		case simpleVdArray, simpleVdArray + 1, simpleVdArray + 2, simpleVdArray + 3, simpleVdArray + 4:
+			d.bdType = valueTypeArray
+		case simpleVdMap, simpleVdMap + 1, simpleVdMap + 2, simpleVdMap + 3, simpleVdMap + 4:
+			d.bdType = valueTypeMap
+		default:
+			decErr("currentEncodedType: Unrecognized d.vd: 0x%x", d.bd)
+		}
+	}
+	return d.bdType
+}
+
+func (d *simpleDecDriver) tryDecodeAsNil() bool {
+	if d.bd == simpleVdNil {
+		d.bdRead = false
+		return true
+	}
+	return false
+}
+
+func (d *simpleDecDriver) isBuiltinType(rt uintptr) bool {
+	return false
+}
+
+func (d *simpleDecDriver) decodeBuiltin(rt uintptr, v interface{}) {
+}
+
+func (d *simpleDecDriver) decIntAny() (ui uint64, i int64, neg bool) {
+	switch d.bd {
+	case simpleVdPosInt:
+		ui = uint64(d.r.readn1())
+		i = int64(ui)
+	case simpleVdPosInt + 1:
+		ui = uint64(d.r.readUint16())
+		i = int64(ui)
+	case simpleVdPosInt + 2:
+		ui = uint64(d.r.readUint32())
+		i = int64(ui)
+	case simpleVdPosInt + 3:
+		ui = uint64(d.r.readUint64())
+		i = int64(ui)
+	case simpleVdNegInt:
+		ui = uint64(d.r.readn1())
+		i = -(int64(ui))
+		neg = true
+	case simpleVdNegInt + 1:
+		ui = uint64(d.r.readUint16())
+		i = -(int64(ui))
+		neg = true
+	case simpleVdNegInt + 2:
+		ui = uint64(d.r.readUint32())
+		i = -(int64(ui))
+		neg = true
+	case simpleVdNegInt + 3:
+		ui = uint64(d.r.readUint64())
+		i = -(int64(ui))
+		neg = true
+	default:
+		decErr("decIntAny: Integer only valid from pos/neg integer1..8. Invalid descriptor: %v", d.bd)
+	}
+	// don't do this check, because callers may only want the unsigned value.
+	// if ui > math.MaxInt64 {
+	// 	decErr("decIntAny: Integer out of range for signed int64: %v", ui)
+	// }
+	return
+}
+
+func (d *simpleDecDriver) decodeInt(bitsize uint8) (i int64) {
+	_, i, _ = d.decIntAny()
+	checkOverflow(0, i, bitsize)
+	d.bdRead = false
+	return
+}
+
+func (d *simpleDecDriver) decodeUint(bitsize uint8) (ui uint64) {
+	ui, i, neg := d.decIntAny()
+	if neg {
+		decErr("Assigning negative signed value: %v, to unsigned type", i)
+	}
+	checkOverflow(ui, 0, bitsize)
+	d.bdRead = false
+	return
+}
+
+func (d *simpleDecDriver) decodeFloat(chkOverflow32 bool) (f float64) {
+	switch d.bd {
+	case simpleVdFloat32:
+		f = float64(math.Float32frombits(d.r.readUint32()))
+	case simpleVdFloat64:
+		f = math.Float64frombits(d.r.readUint64())
+	default:
+		if d.bd >= simpleVdPosInt && d.bd <= simpleVdNegInt+3 {
+			_, i, _ := d.decIntAny()
+			f = float64(i)
+		} else {
+			decErr("Float only valid from float32/64: Invalid descriptor: %v", d.bd)
+		}
+	}
+	checkOverflowFloat32(f, chkOverflow32)
+	d.bdRead = false
+	return
+}
+
+// bool can be decoded from bool only (single byte).
+func (d *simpleDecDriver) decodeBool() (b bool) {
+	switch d.bd {
+	case simpleVdTrue:
+		b = true
+	case simpleVdFalse:
+	default:
+		decErr("Invalid single-byte value for bool: %s: %x", msgBadDesc, d.bd)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *simpleDecDriver) readMapLen() (length int) {
+	d.bdRead = false
+	return d.decLen()
+}
+
+func (d *simpleDecDriver) readArrayLen() (length int) {
+	d.bdRead = false
+	return d.decLen()
+}
+
+func (d *simpleDecDriver) decLen() int {
+	switch d.bd % 8 {
+	case 0:
+		return 0
+	case 1:
+		return int(d.r.readn1())
+	case 2:
+		return int(d.r.readUint16())
+	case 3:
+		ui := uint64(d.r.readUint32())
+		checkOverflow(ui, 0, intBitsize)
+		return int(ui)
+	case 4:
+		ui := d.r.readUint64()
+		checkOverflow(ui, 0, intBitsize)
+		return int(ui)
+	}
+	decErr("decLen: Cannot read length: bd%8 must be in range 0..4. Got: %d", d.bd%8)
+	return -1
+}
+
+func (d *simpleDecDriver) decodeString() (s string) {
+	s = string(d.r.readn(d.decLen()))
+	d.bdRead = false
+	return
+}
+
+func (d *simpleDecDriver) decodeBytes(bs []byte) (bsOut []byte, changed bool) {
+	if clen := d.decLen(); clen > 0 {
+		// if no contents in stream, don't update the passed byteslice
+		if len(bs) != clen {
+			if len(bs) > clen {
+				bs = bs[:clen]
+			} else {
+				bs = make([]byte, clen)
+			}
+			bsOut = bs
+			changed = true
+		}
+		d.r.readb(bs)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *simpleDecDriver) decodeExt(verifyTag bool, tag byte) (xtag byte, xbs []byte) {
+	switch d.bd {
+	case simpleVdExt, simpleVdExt + 1, simpleVdExt + 2, simpleVdExt + 3, simpleVdExt + 4:
+		l := d.decLen()
+		xtag = d.r.readn1()
+		if verifyTag && xtag != tag {
+			decErr("Wrong extension tag. Got %b. Expecting: %v", xtag, tag)
+		}
+		xbs = d.r.readn(l)
+	case simpleVdByteArray, simpleVdByteArray + 1, simpleVdByteArray + 2, simpleVdByteArray + 3, simpleVdByteArray + 4:
+		xbs, _ = d.decodeBytes(nil)
+	default:
+		decErr("Invalid d.vd for extensions (Expecting extensions or byte array). Got: 0x%x", d.bd)
+	}
+	d.bdRead = false
+	return
+}
+
+func (d *simpleDecDriver) decodeNaked() (v interface{}, vt valueType, decodeFurther bool) {
+	d.initReadNext()
+
+	switch d.bd {
+	case simpleVdNil:
+		vt = valueTypeNil
+	case simpleVdFalse:
+		vt = valueTypeBool
+		v = false
+	case simpleVdTrue:
+		vt = valueTypeBool
+		v = true
+	case simpleVdPosInt, simpleVdPosInt + 1, simpleVdPosInt + 2, simpleVdPosInt + 3:
+		vt = valueTypeUint
+		ui, _, _ := d.decIntAny()
+		v = ui
+	case simpleVdNegInt, simpleVdNegInt + 1, simpleVdNegInt + 2, simpleVdNegInt + 3:
+		vt = valueTypeInt
+		_, i, _ := d.decIntAny()
+		v = i
+	case simpleVdFloat32:
+		vt = valueTypeFloat
+		v = d.decodeFloat(true)
+	case simpleVdFloat64:
+		vt = valueTypeFloat
+		v = d.decodeFloat(false)
+	case simpleVdString, simpleVdString + 1, simpleVdString + 2, simpleVdString + 3, simpleVdString + 4:
+		vt = valueTypeString
+		v = d.decodeString()
+	case simpleVdByteArray, simpleVdByteArray + 1, simpleVdByteArray + 2, simpleVdByteArray + 3, simpleVdByteArray + 4:
+		vt = valueTypeBytes
+		v, _ = d.decodeBytes(nil)
+	case simpleVdExt, simpleVdExt + 1, simpleVdExt + 2, simpleVdExt + 3, simpleVdExt + 4:
+		vt = valueTypeExt
+		l := d.decLen()
+		var re RawExt
+		re.Tag = d.r.readn1()
+		re.Data = d.r.readn(l)
+		v = &re
+		vt = valueTypeExt
+	case simpleVdArray, simpleVdArray + 1, simpleVdArray + 2, simpleVdArray + 3, simpleVdArray + 4:
+		vt = valueTypeArray
+		decodeFurther = true
+	case simpleVdMap, simpleVdMap + 1, simpleVdMap + 2, simpleVdMap + 3, simpleVdMap + 4:
+		vt = valueTypeMap
+		decodeFurther = true
+	default:
+		decErr("decodeNaked: Unrecognized d.vd: 0x%x", d.bd)
+	}
+
+	if !decodeFurther {
+		d.bdRead = false
+	}
+	return
+}
+
+//------------------------------------
+
+// SimpleHandle is a Handle for a very simple encoding format.
+//
+// simple is a simplistic codec similar to binc, but not as compact.
+//   - Encoding of a value is always preceeded by the descriptor byte (bd)
+//   - True, false, nil are encoded fully in 1 byte (the descriptor)
+//   - Integers (intXXX, uintXXX) are encoded in 1, 2, 4 or 8 bytes (plus a descriptor byte).
+//     There are positive (uintXXX and intXXX >= 0) and negative (intXXX < 0) integers.
+//   - Floats are encoded in 4 or 8 bytes (plus a descriptor byte)
+//   - Lenght of containers (strings, bytes, array, map, extensions)
+//     are encoded in 0, 1, 2, 4 or 8 bytes.
+//     Zero-length containers have no length encoded.
+//     For others, the number of bytes is given by pow(2, bd%3)
+//   - maps are encoded as [bd] [length] [[key][value]]...
+//   - arrays are encoded as [bd] [length] [value]...
+//   - extensions are encoded as [bd] [length] [tag] [byte]...
+//   - strings/bytearrays are encoded as [bd] [length] [byte]...
+//
+// The full spec will be published soon.
+type SimpleHandle struct {
+	BasicHandle
+}
+
+func (h *SimpleHandle) newEncDriver(w encWriter) encDriver {
+	return &simpleEncDriver{w: w, h: h}
+}
+
+func (h *SimpleHandle) newDecDriver(r decReader) decDriver {
+	return &simpleDecDriver{r: r, h: h}
+}
+
+func (_ *SimpleHandle) writeExt() bool {
+	return true
+}
+
+func (h *SimpleHandle) getBasicHandle() *BasicHandle {
+	return &h.BasicHandle
+}
+
+var _ decDriver = (*simpleDecDriver)(nil)
+var _ encDriver = (*simpleEncDriver)(nil)

vendor/src/github.com/hashicorp/go-msgpack/codec/time.go

@@ -0,0 +1,193 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+package codec
+
+import (
+	"time"
+)
+
+var (
+	timeDigits = [...]byte{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}
+)
+
+// EncodeTime encodes a time.Time as a []byte, including
+// information on the instant in time and UTC offset.
+//
+// Format Description
+//
+//   A timestamp is composed of 3 components:
+//
+//   - secs: signed integer representing seconds since unix epoch
+//   - nsces: unsigned integer representing fractional seconds as a
+//     nanosecond offset within secs, in the range 0 <= nsecs < 1e9
+//   - tz: signed integer representing timezone offset in minutes east of UTC,
+//     and a dst (daylight savings time) flag
+//
+//   When encoding a timestamp, the first byte is the descriptor, which
+//   defines which components are encoded and how many bytes are used to
+//   encode secs and nsecs components. *If secs/nsecs is 0 or tz is UTC, it
+//   is not encoded in the byte array explicitly*.
+//
+//       Descriptor 8 bits are of the form `A B C DDD EE`:
+//           A:   Is secs component encoded? 1 = true
+//           B:   Is nsecs component encoded? 1 = true
+//           C:   Is tz component encoded? 1 = true
+//           DDD: Number of extra bytes for secs (range 0-7).
+//                If A = 1, secs encoded in DDD+1 bytes.
+//                    If A = 0, secs is not encoded, and is assumed to be 0.
+//                    If A = 1, then we need at least 1 byte to encode secs.
+//                    DDD says the number of extra bytes beyond that 1.
+//                    E.g. if DDD=0, then secs is represented in 1 byte.
+//                         if DDD=2, then secs is represented in 3 bytes.
+//           EE:  Number of extra bytes for nsecs (range 0-3).
+//                If B = 1, nsecs encoded in EE+1 bytes (similar to secs/DDD above)
+//
+//   Following the descriptor bytes, subsequent bytes are:
+//
+//       secs component encoded in `DDD + 1` bytes (if A == 1)
+//       nsecs component encoded in `EE + 1` bytes (if B == 1)
+//       tz component encoded in 2 bytes (if C == 1)
+//
+//   secs and nsecs components are integers encoded in a BigEndian
+//   2-complement encoding format.
+//
+//   tz component is encoded as 2 bytes (16 bits). Most significant bit 15 to
+//   Least significant bit 0 are described below:
+//
+//       Timezone offset has a range of -12:00 to +14:00 (ie -720 to +840 minutes).
+//       Bit 15 = have\_dst: set to 1 if we set the dst flag.
+//       Bit 14 = dst\_on: set to 1 if dst is in effect at the time, or 0 if not.
+//       Bits 13..0 = timezone offset in minutes. It is a signed integer in Big Endian format.
+//
+func encodeTime(t time.Time) []byte {
+	//t := rv.Interface().(time.Time)
+	tsecs, tnsecs := t.Unix(), t.Nanosecond()
+	var (
+		bd   byte
+		btmp [8]byte
+		bs   [16]byte
+		i    int = 1
+	)
+	l := t.Location()
+	if l == time.UTC {
+		l = nil
+	}
+	if tsecs != 0 {
+		bd = bd | 0x80
+		bigen.PutUint64(btmp[:], uint64(tsecs))
+		f := pruneSignExt(btmp[:], tsecs >= 0)
+		bd = bd | (byte(7-f) << 2)
+		copy(bs[i:], btmp[f:])
+		i = i + (8 - f)
+	}
+	if tnsecs != 0 {
+		bd = bd | 0x40
+		bigen.PutUint32(btmp[:4], uint32(tnsecs))
+		f := pruneSignExt(btmp[:4], true)
+		bd = bd | byte(3-f)
+		copy(bs[i:], btmp[f:4])
+		i = i + (4 - f)
+	}
+	if l != nil {
+		bd = bd | 0x20
+		// Note that Go Libs do not give access to dst flag.
+		_, zoneOffset := t.Zone()
+		//zoneName, zoneOffset := t.Zone()
+		zoneOffset /= 60
+		z := uint16(zoneOffset)
+		bigen.PutUint16(btmp[:2], z)
+		// clear dst flags
+		bs[i] = btmp[0] & 0x3f
+		bs[i+1] = btmp[1]
+		i = i + 2
+	}
+	bs[0] = bd
+	return bs[0:i]
+}
+
+// DecodeTime decodes a []byte into a time.Time.
+func decodeTime(bs []byte) (tt time.Time, err error) {
+	bd := bs[0]
+	var (
+		tsec  int64
+		tnsec uint32
+		tz    uint16
+		i     byte = 1
+		i2    byte
+		n     byte
+	)
+	if bd&(1<<7) != 0 {
+		var btmp [8]byte
+		n = ((bd >> 2) & 0x7) + 1
+		i2 = i + n
+		copy(btmp[8-n:], bs[i:i2])
+		//if first bit of bs[i] is set, then fill btmp[0..8-n] with 0xff (ie sign extend it)
+		if bs[i]&(1<<7) != 0 {
+			copy(btmp[0:8-n], bsAll0xff)
+			//for j,k := byte(0), 8-n; j < k; j++ {	btmp[j] = 0xff }
+		}
+		i = i2
+		tsec = int64(bigen.Uint64(btmp[:]))
+	}
+	if bd&(1<<6) != 0 {
+		var btmp [4]byte
+		n = (bd & 0x3) + 1
+		i2 = i + n
+		copy(btmp[4-n:], bs[i:i2])
+		i = i2
+		tnsec = bigen.Uint32(btmp[:])
+	}
+	if bd&(1<<5) == 0 {
+		tt = time.Unix(tsec, int64(tnsec)).UTC()
+		return
+	}
+	// In stdlib time.Parse, when a date is parsed without a zone name, it uses "" as zone name.
+	// However, we need name here, so it can be shown when time is printed.
+	// Zone name is in form: UTC-08:00.
+	// Note that Go Libs do not give access to dst flag, so we ignore dst bits
+
+	i2 = i + 2
+	tz = bigen.Uint16(bs[i:i2])
+	i = i2
+	// sign extend sign bit into top 2 MSB (which were dst bits):
+	if tz&(1<<13) == 0 { // positive
+		tz = tz & 0x3fff //clear 2 MSBs: dst bits
+	} else { // negative
+		tz = tz | 0xc000 //set 2 MSBs: dst bits
+		//tzname[3] = '-' (TODO: verify. this works here)
+	}
+	tzint := int16(tz)
+	if tzint == 0 {
+		tt = time.Unix(tsec, int64(tnsec)).UTC()
+	} else {
+		// For Go Time, do not use a descriptive timezone.
+		// It's unnecessary, and makes it harder to do a reflect.DeepEqual.
+		// The Offset already tells what the offset should be, if not on UTC and unknown zone name.
+		// var zoneName = timeLocUTCName(tzint)
+		tt = time.Unix(tsec, int64(tnsec)).In(time.FixedZone("", int(tzint)*60))
+	}
+	return
+}
+
+func timeLocUTCName(tzint int16) string {
+	if tzint == 0 {
+		return "UTC"
+	}
+	var tzname = []byte("UTC+00:00")
+	//tzname := fmt.Sprintf("UTC%s%02d:%02d", tzsign, tz/60, tz%60) //perf issue using Sprintf. inline below.
+	//tzhr, tzmin := tz/60, tz%60 //faster if u convert to int first
+	var tzhr, tzmin int16
+	if tzint < 0 {
+		tzname[3] = '-' // (TODO: verify. this works here)
+		tzhr, tzmin = -tzint/60, (-tzint)%60
+	} else {
+		tzhr, tzmin = tzint/60, tzint%60
+	}
+	tzname[4] = timeDigits[tzhr/10]
+	tzname[5] = timeDigits[tzhr%10]
+	tzname[7] = timeDigits[tzmin/10]
+	tzname[8] = timeDigits[tzmin%10]
+	return string(tzname)
+	//return time.FixedZone(string(tzname), int(tzint)*60)
+}

vendor/src/github.com/hashicorp/memberlist/.gitignore

@@ -0,0 +1,25 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+.vagrant/
+

vendor/src/github.com/hashicorp/memberlist/LICENSE

@@ -0,0 +1,354 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. “Contributor”
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. “Contributor Version”
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor’s Contribution.
+
+1.3. “Contribution”
+
+     means Covered Software of a particular Contributor.
+
+1.4. “Covered Software”
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. “Incompatible With Secondary Licenses”
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of version
+        1.1 or earlier of the License, but not also under the terms of a
+        Secondary License.
+
+1.6. “Executable Form”
+
+     means any form of the work other than Source Code Form.
+
+1.7. “Larger Work”
+
+     means a work that combines Covered Software with other material, in a separate
+     file or files, that is not Covered Software.
+
+1.8. “License”
+
+     means this document.
+
+1.9. “Licensable”
+
+     means having the right to grant, to the maximum extent possible, whether at the
+     time of the initial grant or subsequently, any and all of the rights conveyed by
+     this License.
+
+1.10. “Modifications”
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to, deletion
+        from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. “Patent Claims” of a Contributor
+
+      means any patent claim(s), including without limitation, method, process,
+      and apparatus claims, in any patent Licensable by such Contributor that
+      would be infringed, but for the grant of the License, by the making,
+      using, selling, offering for sale, having made, import, or transfer of
+      either its Contributions or its Contributor Version.
+
+1.12. “Secondary License”
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. “Source Code Form”
+
+      means the form of the work preferred for making modifications.
+
+1.14. “You” (or “Your”)
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, “You” includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, “control” means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or as
+        part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its Contributions
+        or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution become
+     effective for each Contribution on the date the Contributor first distributes
+     such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under this
+     License. No additional rights or licenses will be implied from the distribution
+     or licensing of Covered Software under this License. Notwithstanding Section
+     2.1(b) above, no patent license is granted by a Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party’s
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of its
+        Contributions.
+
+     This License does not grant any rights in the trademarks, service marks, or
+     logos of any Contributor (except as may be necessary to comply with the
+     notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this License
+     (see Section 10.2) or under the terms of a Secondary License (if permitted
+     under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its Contributions
+     are its original creation(s) or it has sufficient rights to grant the
+     rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under applicable
+     copyright doctrines of fair use, fair dealing, or other equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under the
+     terms of this License. You must inform recipients that the Source Code Form
+     of the Covered Software is governed by the terms of this License, and how
+     they can obtain a copy of this License. You may not attempt to alter or
+     restrict the recipients’ rights in the Source Code Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this License,
+        or sublicense it under different terms, provided that the license for
+        the Executable Form does not attempt to limit or alter the recipients’
+        rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for the
+     Covered Software. If the Larger Work is a combination of Covered Software
+     with a work governed by one or more Secondary Licenses, and the Covered
+     Software is not Incompatible With Secondary Licenses, this License permits
+     You to additionally distribute such Covered Software under the terms of
+     such Secondary License(s), so that the recipient of the Larger Work may, at
+     their option, further distribute the Covered Software under the terms of
+     either this License or such Secondary License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices (including
+     copyright notices, patent notices, disclaimers of warranty, or limitations
+     of liability) contained within the Source Code Form of the Covered
+     Software, except that You may alter any license notices to the extent
+     required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on behalf
+     of any Contributor. You must make it absolutely clear that any such
+     warranty, support, indemnity, or liability obligation is offered by You
+     alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute, judicial
+   order, or regulation then You must: (a) comply with the terms of this License
+   to the maximum extent possible; and (b) describe the limitations and the code
+   they affect. Such description must be placed in a text file included with all
+   distributions of the Covered Software under this License. Except to the
+   extent prohibited by statute or regulation, such description must be
+   sufficiently detailed for a recipient of ordinary skill to be able to
+   understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing basis,
+     if such Contributor fails to notify You of the non-compliance by some
+     reasonable means prior to 60 days after You have come back into compliance.
+     Moreover, Your grants from a particular Contributor are reinstated on an
+     ongoing basis if such Contributor notifies You of the non-compliance by
+     some reasonable means, this is the first time You have received notice of
+     non-compliance with this License from such Contributor, and You become
+     compliant prior to 30 days after Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions, counter-claims,
+     and cross-claims) alleging that a Contributor Version directly or
+     indirectly infringes any patent, then the rights granted to You by any and
+     all Contributors for the Covered Software under Section 2.1 of this License
+     shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an “as is” basis, without
+   warranty of any kind, either expressed, implied, or statutory, including,
+   without limitation, warranties that the Covered Software is free of defects,
+   merchantable, fit for a particular purpose or non-infringing. The entire
+   risk as to the quality and performance of the Covered Software is with You.
+   Should any Covered Software prove defective in any respect, You (not any
+   Contributor) assume the cost of any necessary servicing, repair, or
+   correction. This disclaimer of warranty constitutes an essential part of this
+   License. No use of  any Covered Software is authorized under this License
+   except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from such
+   party’s negligence to the extent applicable law prohibits such limitation.
+   Some jurisdictions do not allow the exclusion or limitation of incidental or
+   consequential damages, so this exclusion and limitation may not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts of
+   a jurisdiction where the defendant maintains its principal place of business
+   and such litigation shall be governed by laws of that jurisdiction, without
+   reference to its conflict-of-law provisions. Nothing in this Section shall
+   prevent a party’s ability to bring cross-claims or counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject matter
+   hereof. If any provision of this License is held to be unenforceable, such
+   provision shall be reformed only to the extent necessary to make it
+   enforceable. Any law or regulation which provides that the language of a
+   contract shall be construed against the drafter shall not be used to construe
+   this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version of
+      the License under which You originally received the Covered Software, or
+      under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a modified
+      version of this License if you rename the license and remove any
+      references to the name of the license steward (except to note that such
+      modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
+      If You choose to distribute Source Code Form that is Incompatible With
+      Secondary Licenses under the terms of this version of the License, the
+      notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file, then
+You may include the notice in a location (such as a LICENSE file in a relevant
+directory) where a recipient would be likely to look for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - “Incompatible With Secondary Licenses” Notice
+
+      This Source Code Form is “Incompatible
+      With Secondary Licenses”, as defined by
+      the Mozilla Public License, v. 2.0.
+

vendor/src/github.com/hashicorp/memberlist/Makefile

@@ -0,0 +1,14 @@
+test: subnet
+	go test ./...
+
+integ: subnet
+	INTEG_TESTS=yes go test ./...
+
+subnet:
+	./test/setup_subnet.sh
+
+cov:
+	gocov test github.com/hashicorp/memberlist | gocov-html > /tmp/coverage.html
+	open /tmp/coverage.html
+
+.PNONY: test cov integ

vendor/src/github.com/hashicorp/memberlist/README.md

@@ -0,0 +1,137 @@
+# memberlist
+
+memberlist is a [Go](http://www.golang.org) library that manages cluster
+membership and member failure detection using a gossip based protocol.
+
+The use cases for such a library are far-reaching: all distributed systems
+require membership, and memberlist is a re-usable solution to managing
+cluster membership and node failure detection.
+
+memberlist is eventually consistent but converges quickly on average.
+The speed at which it converges can be heavily tuned via various knobs
+on the protocol. Node failures are detected and network partitions are partially
+tolerated by attempting to communicate to potentially dead nodes through
+multiple routes.
+
+## Building
+
+If you wish to build memberlist you'll need Go version 1.2+ installed.
+
+Please check your installation with:
+
+```
+go version
+```
+
+## Usage
+
+Memberlist is surprisingly simple to use. An example is shown below:
+
+```go
+/* Create the initial memberlist from a safe configuration.
+   Please reference the godoc for other default config types.
+   http://godoc.org/github.com/hashicorp/memberlist#Config
+*/
+list, err := memberlist.Create(memberlist.DefaultLocalConfig())
+if err != nil {
+	panic("Failed to create memberlist: " + err.Error())
+}
+
+// Join an existing cluster by specifying at least one known member.
+n, err := list.Join([]string{"1.2.3.4"})
+if err != nil {
+	panic("Failed to join cluster: " + err.Error())
+}
+
+// Ask for members of the cluster
+for _, member := range list.Members() {
+	fmt.Printf("Member: %s %s\n", member.Name, member.Addr)
+}
+
+// Continue doing whatever you need, memberlist will maintain membership
+// information in the background. Delegates can be used for receiving
+// events when members join or leave.
+```
+
+The most difficult part of memberlist is configuring it since it has many
+available knobs in order to tune state propagation delay and convergence times.
+Memberlist provides a default configuration that offers a good starting point,
+but errs on the side of caution, choosing values that are optimized for
+higher convergence at the cost of higher bandwidth usage.
+
+For complete documentation, see the associated [Godoc](http://godoc.org/github.com/hashicorp/memberlist).
+
+## Protocol
+
+memberlist is based on ["SWIM: Scalable Weakly-consistent Infection-style Process Group Membership Protocol"](http://www.cs.cornell.edu/~asdas/research/dsn02-swim.pdf),
+with a few minor adaptations, mostly to increase propogation speed and
+convergence rate.
+
+A high level overview of the memberlist protocol (based on SWIM) is
+described below, but for details please read the full
+[SWIM paper](http://www.cs.cornell.edu/~asdas/research/dsn02-swim.pdf)
+followed by the memberlist source. We welcome any questions related
+to the protocol on our issue tracker.
+
+### Protocol Description
+
+memberlist begins by joining an existing cluster or starting a new
+cluster. If starting a new cluster, additional nodes are expected to join
+it. New nodes in an existing cluster must be given the address of at
+least one existing member in order to join the cluster. The new member
+does a full state sync with the existing member over TCP and begins gossiping its
+existence to the cluster.
+
+Gossip is done over UDP to a with a configurable but fixed fanout and interval.
+This ensures that network usage is constant with regards to number of nodes, as opposed to
+exponential growth that can occur with traditional heartbeat mechanisms.
+Complete state exchanges with a random node are done periodically over
+TCP, but much less often than gossip messages. This increases the likelihood
+that the membership list converges properly since the full state is exchanged
+and merged. The interval between full state exchanges is configurable or can
+be disabled entirely.
+
+Failure detection is done by periodic random probing using a configurable interval.
+If the node fails to ack within a reasonable time (typically some multiple
+of RTT), then an indirect probe is attempted. An indirect probe asks a
+configurable number of random nodes to probe the same node, in case there
+are network issues causing our own node to fail the probe. If both our
+probe and the indirect probes fail within a reasonable time, then the
+node is marked "suspicious" and this knowledge is gossiped to the cluster.
+A suspicious node is still considered a member of cluster. If the suspect member
+of the cluster does not disputes the suspicion within a configurable period of
+time, the node is finally considered dead, and this state is then gossiped
+to the cluster.
+
+This is a brief and incomplete description of the protocol. For a better idea,
+please read the
+[SWIM paper](http://www.cs.cornell.edu/~asdas/research/dsn02-swim.pdf)
+in its entirety, along with the memberlist source code.
+
+### Changes from SWIM
+
+As mentioned earlier, the memberlist protocol is based on SWIM but includes
+minor changes, mostly to increase propogation speed and convergence rates.
+
+The changes from SWIM are noted here:
+
+* memberlist does a full state sync over TCP periodically. SWIM only propagates
+  changes over gossip. While both eventually reach convergence, the full state
+  sync increases the likelihood that nodes are fully converged more quickly,
+  at the expense of more bandwidth usage. This feature can be totally disabled
+  if you wish.
+
+* memberlist has a dedicated gossip layer separate from the failure detection
+  protocol. SWIM only piggybacks gossip messages on top of probe/ack messages.
+  memberlist also piggybacks gossip messages on top of probe/ack messages, but
+  also will periodically send out dedicated gossip messages on their own. This
+  feature lets you have a higher gossip rate (for example once per 200ms)
+  and a slower failure detection rate (such as once per second), resulting
+  in overall faster convergence rates and data propogation speeds. This feature
+  can be totally disabed as well, if you wish.
+
+* memberlist stores around the state of dead nodes for a set amount of time,
+  so that when full syncs are requested, the requester also receives information
+  about dead nodes. Because SWIM doesn't do full syncs, SWIM deletes dead node
+  state immediately upon learning that the node is dead. This change again helps
+  the cluster converge more quickly.

vendor/src/github.com/hashicorp/memberlist/broadcast.go

@@ -0,0 +1,100 @@
+package memberlist
+
+/*
+The broadcast mechanism works by maintaining a sorted list of messages to be
+sent out. When a message is to be broadcast, the retransmit count
+is set to zero and appended to the queue. The retransmit count serves
+as the "priority", ensuring that newer messages get sent first. Once
+a message hits the retransmit limit, it is removed from the queue.
+
+Additionally, older entries can be invalidated by new messages that
+are contradictory. For example, if we send "{suspect M1 inc: 1},
+then a following {alive M1 inc: 2} will invalidate that message
+*/
+
+type memberlistBroadcast struct {
+	node   string
+	msg    []byte
+	notify chan struct{}
+}
+
+func (b *memberlistBroadcast) Invalidates(other Broadcast) bool {
+	// Check if that broadcast is a memberlist type
+	mb, ok := other.(*memberlistBroadcast)
+	if !ok {
+		return false
+	}
+
+	// Invalidates any message about the same node
+	return b.node == mb.node
+}
+
+func (b *memberlistBroadcast) Message() []byte {
+	return b.msg
+}
+
+func (b *memberlistBroadcast) Finished() {
+	select {
+	case b.notify <- struct{}{}:
+	default:
+	}
+}
+
+// encodeAndBroadcast encodes a message and enqueues it for broadcast. Fails
+// silently if there is an encoding error.
+func (m *Memberlist) encodeAndBroadcast(node string, msgType messageType, msg interface{}) {
+	m.encodeBroadcastNotify(node, msgType, msg, nil)
+}
+
+// encodeBroadcastNotify encodes a message and enqueues it for broadcast
+// and notifies the given channel when transmission is finished. Fails
+// silently if there is an encoding error.
+func (m *Memberlist) encodeBroadcastNotify(node string, msgType messageType, msg interface{}, notify chan struct{}) {
+	buf, err := encode(msgType, msg)
+	if err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to encode message for broadcast: %s", err)
+	} else {
+		m.queueBroadcast(node, buf.Bytes(), notify)
+	}
+}
+
+// queueBroadcast is used to start dissemination of a message. It will be
+// sent up to a configured number of times. The message could potentially
+// be invalidated by a future message about the same node
+func (m *Memberlist) queueBroadcast(node string, msg []byte, notify chan struct{}) {
+	b := &memberlistBroadcast{node, msg, notify}
+	m.broadcasts.QueueBroadcast(b)
+}
+
+// getBroadcasts is used to return a slice of broadcasts to send up to
+// a maximum byte size, while imposing a per-broadcast overhead. This is used
+// to fill a UDP packet with piggybacked data
+func (m *Memberlist) getBroadcasts(overhead, limit int) [][]byte {
+	// Get memberlist messages first
+	toSend := m.broadcasts.GetBroadcasts(overhead, limit)
+
+	// Check if the user has anything to broadcast
+	d := m.config.Delegate
+	if d != nil {
+		// Determine the bytes used already
+		bytesUsed := 0
+		for _, msg := range toSend {
+			bytesUsed += len(msg) + overhead
+		}
+
+		// Check space remaining for user messages
+		avail := limit - bytesUsed
+		if avail > overhead+userMsgOverhead {
+			userMsgs := d.GetBroadcasts(overhead+userMsgOverhead, avail)
+
+			// Frame each user message
+			for _, msg := range userMsgs {
+				buf := make([]byte, 1, len(msg)+1)
+				buf[0] = byte(userMsg)
+				buf = append(buf, msg...)
+				toSend = append(toSend, buf)
+			}
+		}
+	}
+	return toSend
+}

vendor/src/github.com/hashicorp/memberlist/config.go

@@ -0,0 +1,209 @@
+package memberlist
+
+import (
+	"io"
+	"os"
+	"time"
+)
+
+type Config struct {
+	// The name of this node. This must be unique in the cluster.
+	Name string
+
+	// Configuration related to what address to bind to and ports to
+	// listen on. The port is used for both UDP and TCP gossip.
+	// It is assumed other nodes are running on this port, but they
+	// do not need to.
+	BindAddr string
+	BindPort int
+
+	// Configuration related to what address to advertise to other
+	// cluster members. Used for nat traversal.
+	AdvertiseAddr string
+	AdvertisePort int
+
+	// ProtocolVersion is the configured protocol version that we
+	// will _speak_. This must be between ProtocolVersionMin and
+	// ProtocolVersionMax.
+	ProtocolVersion uint8
+
+	// TCPTimeout is the timeout for establishing a TCP connection with
+	// a remote node for a full state sync.
+	TCPTimeout time.Duration
+
+	// IndirectChecks is the number of nodes that will be asked to perform
+	// an indirect probe of a node in the case a direct probe fails. Memberlist
+	// waits for an ack from any single indirect node, so increasing this
+	// number will increase the likelihood that an indirect probe will succeed
+	// at the expense of bandwidth.
+	IndirectChecks int
+
+	// RetransmitMult is the multiplier for the number of retransmissions
+	// that are attempted for messages broadcasted over gossip. The actual
+	// count of retransmissions is calculated using the formula:
+	//
+	//   Retransmits = RetransmitMult * log(N+1)
+	//
+	// This allows the retransmits to scale properly with cluster size. The
+	// higher the multiplier, the more likely a failed broadcast is to converge
+	// at the expense of increased bandwidth.
+	RetransmitMult int
+
+	// SuspicionMult is the multiplier for determining the time an
+	// inaccessible node is considered suspect before declaring it dead.
+	// The actual timeout is calculated using the formula:
+	//
+	//   SuspicionTimeout = SuspicionMult * log(N+1) * ProbeInterval
+	//
+	// This allows the timeout to scale properly with expected propagation
+	// delay with a larger cluster size. The higher the multiplier, the longer
+	// an inaccessible node is considered part of the cluster before declaring
+	// it dead, giving that suspect node more time to refute if it is indeed
+	// still alive.
+	SuspicionMult int
+
+	// PushPullInterval is the interval between complete state syncs.
+	// Complete state syncs are done with a single node over TCP and are
+	// quite expensive relative to standard gossiped messages. Setting this
+	// to zero will disable state push/pull syncs completely.
+	//
+	// Setting this interval lower (more frequent) will increase convergence
+	// speeds across larger clusters at the expense of increased bandwidth
+	// usage.
+	PushPullInterval time.Duration
+
+	// ProbeInterval and ProbeTimeout are used to configure probing
+	// behavior for memberlist.
+	//
+	// ProbeInterval is the interval between random node probes. Setting
+	// this lower (more frequent) will cause the memberlist cluster to detect
+	// failed nodes more quickly at the expense of increased bandwidth usage.
+	//
+	// ProbeTimeout is the timeout to wait for an ack from a probed node
+	// before assuming it is unhealthy. This should be set to 99-percentile
+	// of RTT (round-trip time) on your network.
+	ProbeInterval time.Duration
+	ProbeTimeout  time.Duration
+
+	// GossipInterval and GossipNodes are used to configure the gossip
+	// behavior of memberlist.
+	//
+	// GossipInterval is the interval between sending messages that need
+	// to be gossiped that haven't been able to piggyback on probing messages.
+	// If this is set to zero, non-piggyback gossip is disabled. By lowering
+	// this value (more frequent) gossip messages are propagated across
+	// the cluster more quickly at the expense of increased bandwidth.
+	//
+	// GossipNodes is the number of random nodes to send gossip messages to
+	// per GossipInterval. Increasing this number causes the gossip messages
+	// to propagate across the cluster more quickly at the expense of
+	// increased bandwidth.
+	GossipInterval time.Duration
+	GossipNodes    int
+
+	// EnableCompression is used to control message compression. This can
+	// be used to reduce bandwidth usage at the cost of slightly more CPU
+	// utilization. This is only available starting at protocol version 1.
+	EnableCompression bool
+
+	// SecretKey is used to initialize the primary encryption key in a keyring.
+	// The primary encryption key is the only key used to encrypt messages and
+	// the first key used while attempting to decrypt messages. Providing a
+	// value for this primary key will enable message-level encryption and
+	// verification, and automatically install the key onto the keyring.
+	SecretKey []byte
+
+	// The keyring holds all of the encryption keys used internally. It is
+	// automatically initialized using the SecretKey and SecretKeys values.
+	Keyring *Keyring
+
+	// Delegate and Events are delegates for receiving and providing
+	// data to memberlist via callback mechanisms. For Delegate, see
+	// the Delegate interface. For Events, see the EventDelegate interface.
+	//
+	// The DelegateProtocolMin/Max are used to guarantee protocol-compatibility
+	// for any custom messages that the delegate might do (broadcasts,
+	// local/remote state, etc.). If you don't set these, then the protocol
+	// versions will just be zero, and version compliance won't be done.
+	Delegate                Delegate
+	DelegateProtocolVersion uint8
+	DelegateProtocolMin     uint8
+	DelegateProtocolMax     uint8
+	Events                  EventDelegate
+	Conflict                ConflictDelegate
+	Merge                   MergeDelegate
+
+	// LogOutput is the writer where logs should be sent. If this is not
+	// set, logging will go to stderr by default.
+	LogOutput io.Writer
+}
+
+// DefaultLANConfig returns a sane set of configurations for Memberlist.
+// It uses the hostname as the node name, and otherwise sets very conservative
+// values that are sane for most LAN environments. The default configuration
+// errs on the side on the side of caution, choosing values that are optimized
+// for higher convergence at the cost of higher bandwidth usage. Regardless,
+// these values are a good starting point when getting started with memberlist.
+func DefaultLANConfig() *Config {
+	hostname, _ := os.Hostname()
+	return &Config{
+		Name:             hostname,
+		BindAddr:         "0.0.0.0",
+		BindPort:         7946,
+		AdvertiseAddr:    "",
+		AdvertisePort:    7946,
+		ProtocolVersion:  ProtocolVersionMax,
+		TCPTimeout:       10 * time.Second,       // Timeout after 10 seconds
+		IndirectChecks:   3,                      // Use 3 nodes for the indirect ping
+		RetransmitMult:   4,                      // Retransmit a message 4 * log(N+1) nodes
+		SuspicionMult:    5,                      // Suspect a node for 5 * log(N+1) * Interval
+		PushPullInterval: 30 * time.Second,       // Low frequency
+		ProbeTimeout:     500 * time.Millisecond, // Reasonable RTT time for LAN
+		ProbeInterval:    1 * time.Second,        // Failure check every second
+
+		GossipNodes:    3,                      // Gossip to 3 nodes
+		GossipInterval: 200 * time.Millisecond, // Gossip more rapidly
+
+		EnableCompression: true, // Enable compression by default
+
+		SecretKey: nil,
+
+		Keyring: nil,
+	}
+}
+
+// DefaultWANConfig works like DefaultConfig, however it returns a configuration
+// that is optimized for most WAN environments. The default configuration is
+// still very conservative and errs on the side of caution.
+func DefaultWANConfig() *Config {
+	conf := DefaultLANConfig()
+	conf.TCPTimeout = 30 * time.Second
+	conf.SuspicionMult = 6
+	conf.PushPullInterval = 60 * time.Second
+	conf.ProbeTimeout = 3 * time.Second
+	conf.ProbeInterval = 5 * time.Second
+	conf.GossipNodes = 4 // Gossip less frequently, but to an additional node
+	conf.GossipInterval = 500 * time.Millisecond
+	return conf
+}
+
+// DefaultLocalConfig works like DefaultConfig, however it returns a configuration
+// that is optimized for a local loopback environments. The default configuration is
+// still very conservative and errs on the side of caution.
+func DefaultLocalConfig() *Config {
+	conf := DefaultLANConfig()
+	conf.TCPTimeout = time.Second
+	conf.IndirectChecks = 1
+	conf.RetransmitMult = 2
+	conf.SuspicionMult = 3
+	conf.PushPullInterval = 15 * time.Second
+	conf.ProbeTimeout = 200 * time.Millisecond
+	conf.ProbeInterval = time.Second
+	conf.GossipInterval = 100 * time.Millisecond
+	return conf
+}
+
+// Returns whether or not encryption is enabled
+func (c *Config) EncryptionEnabled() bool {
+	return c.Keyring != nil && len(c.Keyring.GetKeys()) > 0
+}

vendor/src/github.com/hashicorp/memberlist/conflict_delegate.go

@@ -0,0 +1,10 @@
+package memberlist
+
+// ConflictDelegate is a used to inform a client that
+// a node has attempted to join which would result in a
+// name conflict. This happens if two clients are configured
+// with the same name but different addresses.
+type ConflictDelegate interface {
+	// NotifyConflict is invoked when a name conflict is detected
+	NotifyConflict(existing, other *Node)
+}

vendor/src/github.com/hashicorp/memberlist/delegate.go

@@ -0,0 +1,36 @@
+package memberlist
+
+// Delegate is the interface that clients must implement if they want to hook
+// into the gossip layer of Memberlist. All the methods must be thread-safe,
+// as they can and generally will be called concurrently.
+type Delegate interface {
+	// NodeMeta is used to retrieve meta-data about the current node
+	// when broadcasting an alive message. It's length is limited to
+	// the given byte size. This metadata is available in the Node structure.
+	NodeMeta(limit int) []byte
+
+	// NotifyMsg is called when a user-data message is received.
+	// Care should be taken that this method does not block, since doing
+	// so would block the entire UDP packet receive loop. Additionally, the byte
+	// slice may be modified after the call returns, so it should be copied if needed.
+	NotifyMsg([]byte)
+
+	// GetBroadcasts is called when user data messages can be broadcast.
+	// It can return a list of buffers to send. Each buffer should assume an
+	// overhead as provided with a limit on the total byte size allowed.
+	// The total byte size of the resulting data to send must not exceed
+	// the limit.
+	GetBroadcasts(overhead, limit int) [][]byte
+
+	// LocalState is used for a TCP Push/Pull. This is sent to
+	// the remote side in addition to the membership information. Any
+	// data can be sent here. See MergeRemoteState as well. The `join`
+	// boolean indicates this is for a join instead of a push/pull.
+	LocalState(join bool) []byte
+
+	// MergeRemoteState is invoked after a TCP Push/Pull. This is the
+	// state received from the remote side and is the result of the
+	// remote side's LocalState call. The 'join'
+	// boolean indicates this is for a join instead of a push/pull.
+	MergeRemoteState(buf []byte, join bool)
+}

vendor/src/github.com/hashicorp/memberlist/event_delegate.go

@@ -0,0 +1,61 @@
+package memberlist
+
+// EventDelegate is a simpler delegate that is used only to receive
+// notifications about members joining and leaving. The methods in this
+// delegate may be called by multiple goroutines, but never concurrently.
+// This allows you to reason about ordering.
+type EventDelegate interface {
+	// NotifyJoin is invoked when a node is detected to have joined.
+	// The Node argument must not be modified.
+	NotifyJoin(*Node)
+
+	// NotifyLeave is invoked when a node is detected to have left.
+	// The Node argument must not be modified.
+	NotifyLeave(*Node)
+
+	// NotifyUpdate is invoked when a node is detected to have
+	// updated, usually involving the meta data. The Node argument
+	// must not be modified.
+	NotifyUpdate(*Node)
+}
+
+// ChannelEventDelegate is used to enable an application to receive
+// events about joins and leaves over a channel instead of a direct
+// function call.
+//
+// Care must be taken that events are processed in a timely manner from
+// the channel, since this delegate will block until an event can be sent.
+type ChannelEventDelegate struct {
+	Ch chan<- NodeEvent
+}
+
+// NodeEventType are the types of events that can be sent from the
+// ChannelEventDelegate.
+type NodeEventType int
+
+const (
+	NodeJoin NodeEventType = iota
+	NodeLeave
+	NodeUpdate
+)
+
+// NodeEvent is a single event related to node activity in the memberlist.
+// The Node member of this struct must not be directly modified. It is passed
+// as a pointer to avoid unnecessary copies. If you wish to modify the node,
+// make a copy first.
+type NodeEvent struct {
+	Event NodeEventType
+	Node  *Node
+}
+
+func (c *ChannelEventDelegate) NotifyJoin(n *Node) {
+	c.Ch <- NodeEvent{NodeJoin, n}
+}
+
+func (c *ChannelEventDelegate) NotifyLeave(n *Node) {
+	c.Ch <- NodeEvent{NodeLeave, n}
+}
+
+func (c *ChannelEventDelegate) NotifyUpdate(n *Node) {
+	c.Ch <- NodeEvent{NodeUpdate, n}
+}

vendor/src/github.com/hashicorp/memberlist/keyring.go

@@ -0,0 +1,144 @@
+package memberlist
+
+import (
+	"bytes"
+	"fmt"
+	"sync"
+)
+
+type Keyring struct {
+	// Keys stores the key data used during encryption and decryption. It is
+	// ordered in such a way where the first key (index 0) is the primary key,
+	// which is used for encrypting messages, and is the first key tried during
+	// message decryption.
+	keys [][]byte
+
+	// The keyring lock is used while performing IO operations on the keyring.
+	l sync.Mutex
+}
+
+// Init allocates substructures
+func (k *Keyring) init() {
+	k.keys = make([][]byte, 0)
+}
+
+// NewKeyring constructs a new container for a set of encryption keys. The
+// keyring contains all key data used internally by memberlist.
+//
+// While creating a new keyring, you must do one of:
+//   - Omit keys and primary key, effectively disabling encryption
+//   - Pass a set of keys plus the primary key
+//   - Pass only a primary key
+//
+// If only a primary key is passed, then it will be automatically added to the
+// keyring. If creating a keyring with multiple keys, one key must be designated
+// primary by passing it as the primaryKey. If the primaryKey does not exist in
+// the list of secondary keys, it will be automatically added at position 0.
+func NewKeyring(keys [][]byte, primaryKey []byte) (*Keyring, error) {
+	keyring := &Keyring{}
+	keyring.init()
+
+	if len(keys) > 0 || len(primaryKey) > 0 {
+		if len(primaryKey) == 0 {
+			return nil, fmt.Errorf("Empty primary key not allowed")
+		}
+		if err := keyring.AddKey(primaryKey); err != nil {
+			return nil, err
+		}
+		for _, key := range keys {
+			if err := keyring.AddKey(key); err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return keyring, nil
+}
+
+// AddKey will install a new key on the ring. Adding a key to the ring will make
+// it available for use in decryption. If the key already exists on the ring,
+// this function will just return noop.
+func (k *Keyring) AddKey(key []byte) error {
+	// Encorce 16-byte key size
+	if len(key) != 16 {
+		return fmt.Errorf("key size must be 16 bytes")
+	}
+
+	// No-op if key is already installed
+	for _, installedKey := range k.keys {
+		if bytes.Equal(installedKey, key) {
+			return nil
+		}
+	}
+
+	keys := append(k.keys, key)
+	primaryKey := k.GetPrimaryKey()
+	if primaryKey == nil {
+		primaryKey = key
+	}
+	k.installKeys(keys, primaryKey)
+	return nil
+}
+
+// UseKey changes the key used to encrypt messages. This is the only key used to
+// encrypt messages, so peers should know this key before this method is called.
+func (k *Keyring) UseKey(key []byte) error {
+	for _, installedKey := range k.keys {
+		if bytes.Equal(key, installedKey) {
+			k.installKeys(k.keys, key)
+			return nil
+		}
+	}
+	return fmt.Errorf("Requested key is not in the keyring")
+}
+
+// RemoveKey drops a key from the keyring. This will return an error if the key
+// requested for removal is currently at position 0 (primary key).
+func (k *Keyring) RemoveKey(key []byte) error {
+	if bytes.Equal(key, k.keys[0]) {
+		return fmt.Errorf("Removing the primary key is not allowed")
+	}
+	for i, installedKey := range k.keys {
+		if bytes.Equal(key, installedKey) {
+			keys := append(k.keys[:i], k.keys[i+1:]...)
+			k.installKeys(keys, k.keys[0])
+		}
+	}
+	return nil
+}
+
+// installKeys will take out a lock on the keyring, and replace the keys with a
+// new set of keys. The key indicated by primaryKey will be installed as the new
+// primary key.
+func (k *Keyring) installKeys(keys [][]byte, primaryKey []byte) {
+	k.l.Lock()
+	defer k.l.Unlock()
+
+	newKeys := [][]byte{primaryKey}
+	for _, key := range keys {
+		if !bytes.Equal(key, primaryKey) {
+			newKeys = append(newKeys, key)
+		}
+	}
+	k.keys = newKeys
+}
+
+// GetKeys returns the current set of keys on the ring.
+func (k *Keyring) GetKeys() [][]byte {
+	k.l.Lock()
+	defer k.l.Unlock()
+
+	return k.keys
+}
+
+// GetPrimaryKey returns the key on the ring at position 0. This is the key used
+// for encrypting messages, and is the first key tried for decrypting messages.
+func (k *Keyring) GetPrimaryKey() (key []byte) {
+	k.l.Lock()
+	defer k.l.Unlock()
+
+	if len(k.keys) > 0 {
+		key = k.keys[0]
+	}
+	return
+}

vendor/src/github.com/hashicorp/memberlist/memberlist.go

@@ -0,0 +1,525 @@
+/*
+memberlist is a library that manages cluster
+membership and member failure detection using a gossip based protocol.
+
+The use cases for such a library are far-reaching: all distributed systems
+require membership, and memberlist is a re-usable solution to managing
+cluster membership and node failure detection.
+
+memberlist is eventually consistent but converges quickly on average.
+The speed at which it converges can be heavily tuned via various knobs
+on the protocol. Node failures are detected and network partitions are partially
+tolerated by attempting to communicate to potentially dead nodes through
+multiple routes.
+*/
+package memberlist
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"strconv"
+	"sync"
+	"time"
+)
+
+type Memberlist struct {
+	config         *Config
+	shutdown       bool
+	shutdownCh     chan struct{}
+	leave          bool
+	leaveBroadcast chan struct{}
+
+	udpListener *net.UDPConn
+	tcpListener *net.TCPListener
+	handoff     chan msgHandoff
+
+	sequenceNum uint32 // Local sequence number
+	incarnation uint32 // Local incarnation number
+
+	nodeLock sync.RWMutex
+	nodes    []*nodeState          // Known nodes
+	nodeMap  map[string]*nodeState // Maps Addr.String() -> NodeState
+
+	tickerLock sync.Mutex
+	tickers    []*time.Ticker
+	stopTick   chan struct{}
+	probeIndex int
+
+	ackLock     sync.Mutex
+	ackHandlers map[uint32]*ackHandler
+
+	broadcasts *TransmitLimitedQueue
+
+	startStopLock sync.Mutex
+
+	logger *log.Logger
+}
+
+// newMemberlist creates the network listeners.
+// Does not schedule execution of background maintenence.
+func newMemberlist(conf *Config) (*Memberlist, error) {
+	if conf.ProtocolVersion < ProtocolVersionMin {
+		return nil, fmt.Errorf("Protocol version '%d' too low. Must be in range: [%d, %d]",
+			conf.ProtocolVersion, ProtocolVersionMin, ProtocolVersionMax)
+	} else if conf.ProtocolVersion > ProtocolVersionMax {
+		return nil, fmt.Errorf("Protocol version '%d' too high. Must be in range: [%d, %d]",
+			conf.ProtocolVersion, ProtocolVersionMin, ProtocolVersionMax)
+	}
+
+	if len(conf.SecretKey) > 0 {
+		if conf.Keyring == nil {
+			keyring, err := NewKeyring(nil, conf.SecretKey)
+			if err != nil {
+				return nil, err
+			}
+			conf.Keyring = keyring
+		} else {
+			if err := conf.Keyring.AddKey(conf.SecretKey); err != nil {
+				return nil, err
+			}
+			if err := conf.Keyring.UseKey(conf.SecretKey); err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	tcpAddr := &net.TCPAddr{IP: net.ParseIP(conf.BindAddr), Port: conf.BindPort}
+	tcpLn, err := net.ListenTCP("tcp", tcpAddr)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to start TCP listener. Err: %s", err)
+	}
+
+	udpAddr := &net.UDPAddr{IP: net.ParseIP(conf.BindAddr), Port: conf.BindPort}
+	udpLn, err := net.ListenUDP("udp", udpAddr)
+	if err != nil {
+		tcpLn.Close()
+		return nil, fmt.Errorf("Failed to start UDP listener. Err: %s", err)
+	}
+
+	// Set the UDP receive window size
+	setUDPRecvBuf(udpLn)
+
+	if conf.LogOutput == nil {
+		conf.LogOutput = os.Stderr
+	}
+	logger := log.New(conf.LogOutput, "", log.LstdFlags)
+
+	m := &Memberlist{
+		config:         conf,
+		shutdownCh:     make(chan struct{}),
+		leaveBroadcast: make(chan struct{}, 1),
+		udpListener:    udpLn,
+		tcpListener:    tcpLn,
+		handoff:        make(chan msgHandoff, 1024),
+		nodeMap:        make(map[string]*nodeState),
+		ackHandlers:    make(map[uint32]*ackHandler),
+		broadcasts:     &TransmitLimitedQueue{RetransmitMult: conf.RetransmitMult},
+		logger:         logger,
+	}
+	m.broadcasts.NumNodes = func() int { return len(m.nodes) }
+	go m.tcpListen()
+	go m.udpListen()
+	go m.udpHandler()
+	return m, nil
+}
+
+// Create will create a new Memberlist using the given configuration.
+// This will not connect to any other node (see Join) yet, but will start
+// all the listeners to allow other nodes to join this memberlist.
+// After creating a Memberlist, the configuration given should not be
+// modified by the user anymore.
+func Create(conf *Config) (*Memberlist, error) {
+	m, err := newMemberlist(conf)
+	if err != nil {
+		return nil, err
+	}
+	if err := m.setAlive(); err != nil {
+		m.Shutdown()
+		return nil, err
+	}
+	m.schedule()
+	return m, nil
+}
+
+// Join is used to take an existing Memberlist and attempt to join a cluster
+// by contacting all the given hosts and performing a state sync. Initially,
+// the Memberlist only contains our own state, so doing this will cause
+// remote nodes to become aware of the existence of this node, effectively
+// joining the cluster.
+//
+// This returns the number of hosts successfully contacted and an error if
+// none could be reached. If an error is returned, the node did not successfully
+// join the cluster.
+func (m *Memberlist) Join(existing []string) (int, error) {
+	// Attempt to join any of them
+	numSuccess := 0
+	var retErr error
+	for _, exist := range existing {
+		addrs, port, err := m.resolveAddr(exist)
+		if err != nil {
+			m.logger.Printf("[WARN] memberlist: Failed to resolve %s: %v", exist, err)
+			retErr = err
+			continue
+		}
+
+		for _, addr := range addrs {
+			if err := m.pushPullNode(addr, port, true); err != nil {
+				retErr = err
+				continue
+			}
+			numSuccess++
+		}
+
+	}
+
+	if numSuccess > 0 {
+		retErr = nil
+	}
+
+	return numSuccess, retErr
+}
+
+// resolveAddr is used to resolve the address into an address,
+// port, and error. If no port is given, use the default
+func (m *Memberlist) resolveAddr(hostStr string) ([][]byte, uint16, error) {
+	ips := make([][]byte, 0)
+	port := uint16(0)
+	host, sport, err := net.SplitHostPort(hostStr)
+	if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
+		// error, port missing - we can solve this
+		port = uint16(m.config.BindPort)
+		host = hostStr
+	} else if err != nil {
+		// error, but not missing port
+		return ips, port, err
+	} else if lport, err := strconv.ParseUint(sport, 10, 16); err != nil {
+		// error, when parsing port
+		return ips, port, err
+	} else {
+		// no error
+		port = uint16(lport)
+	}
+
+	// Get the addresses that hostPort might resolve to
+	// ResolveTcpAddr requres ipv6 brackets to separate
+	// port numbers whereas ParseIP doesn't, but luckily
+	// SplitHostPort takes care of the brackets
+	if ip := net.ParseIP(host); ip == nil {
+		if pre, err := net.LookupIP(host); err == nil {
+			for _, ip := range pre {
+				ips = append(ips, ip)
+			}
+		} else {
+			return ips, port, err
+		}
+	} else {
+		ips = append(ips, ip)
+	}
+
+	return ips, port, nil
+}
+
+// setAlive is used to mark this node as being alive. This is the same
+// as if we received an alive notification our own network channel for
+// ourself.
+func (m *Memberlist) setAlive() error {
+
+	var advertiseAddr []byte
+	var advertisePort int
+	if m.config.AdvertiseAddr != "" {
+		// If AdvertiseAddr is not empty, then advertise
+		// the given address and port.
+		ip := net.ParseIP(m.config.AdvertiseAddr)
+		if ip == nil {
+			return fmt.Errorf("Failed to parse advertise address!")
+		}
+
+		// Ensure IPv4 conversion if necessary
+		if ip4 := ip.To4(); ip4 != nil {
+			ip = ip4
+		}
+
+		advertiseAddr = ip
+		advertisePort = m.config.AdvertisePort
+	} else {
+		if m.config.BindAddr == "0.0.0.0" {
+			// Otherwise, if we're not bound to a specific IP,
+			//let's list the interfaces on this machine and use
+			// the first private IP we find.
+			addresses, err := net.InterfaceAddrs()
+			if err != nil {
+				return fmt.Errorf("Failed to get interface addresses! Err: %v", err)
+			}
+
+			// Find private IPv4 address
+			for _, rawAddr := range addresses {
+				var ip net.IP
+				switch addr := rawAddr.(type) {
+				case *net.IPAddr:
+					ip = addr.IP
+				case *net.IPNet:
+					ip = addr.IP
+				default:
+					continue
+				}
+
+				if ip.To4() == nil {
+					continue
+				}
+				if !isPrivateIP(ip.String()) {
+					continue
+				}
+
+				advertiseAddr = ip
+				break
+			}
+
+			// Failed to find private IP, error
+			if advertiseAddr == nil {
+				return fmt.Errorf("No private IP address found, and explicit IP not provided")
+			}
+
+		} else {
+			// Use the IP that we're bound to.
+			addr := m.tcpListener.Addr().(*net.TCPAddr)
+			advertiseAddr = addr.IP
+		}
+		advertisePort = m.config.BindPort
+	}
+
+	// Check if this is a public address without encryption
+	addrStr := net.IP(advertiseAddr).String()
+	if !isPrivateIP(addrStr) && !isLoopbackIP(addrStr) && !m.config.EncryptionEnabled() {
+		m.logger.Printf("[WARN] memberlist: Binding to public address without encryption!")
+	}
+
+	// Get the node meta data
+	var meta []byte
+	if m.config.Delegate != nil {
+		meta = m.config.Delegate.NodeMeta(MetaMaxSize)
+		if len(meta) > MetaMaxSize {
+			panic("Node meta data provided is longer than the limit")
+		}
+	}
+
+	a := alive{
+		Incarnation: m.nextIncarnation(),
+		Node:        m.config.Name,
+		Addr:        advertiseAddr,
+		Port:        uint16(advertisePort),
+		Meta:        meta,
+		Vsn: []uint8{
+			ProtocolVersionMin, ProtocolVersionMax, m.config.ProtocolVersion,
+			m.config.DelegateProtocolMin, m.config.DelegateProtocolMax,
+			m.config.DelegateProtocolVersion,
+		},
+	}
+	m.aliveNode(&a, nil, true)
+
+	return nil
+}
+
+// LocalNode is used to return the local Node
+func (m *Memberlist) LocalNode() *Node {
+	m.nodeLock.RLock()
+	defer m.nodeLock.RUnlock()
+	state := m.nodeMap[m.config.Name]
+	return &state.Node
+}
+
+// UpdateNode is used to trigger re-advertising the local node. This is
+// primarily used with a Delegate to support dynamic updates to the local
+// meta data.  This will block until the update message is successfully
+// broadcasted to a member of the cluster, if any exist or until a specified
+// timeout is reached.
+func (m *Memberlist) UpdateNode(timeout time.Duration) error {
+	// Get the node meta data
+	var meta []byte
+	if m.config.Delegate != nil {
+		meta = m.config.Delegate.NodeMeta(MetaMaxSize)
+		if len(meta) > MetaMaxSize {
+			panic("Node meta data provided is longer than the limit")
+		}
+	}
+
+	// Get the existing node
+	m.nodeLock.RLock()
+	state := m.nodeMap[m.config.Name]
+	m.nodeLock.RUnlock()
+
+	// Format a new alive message
+	a := alive{
+		Incarnation: m.nextIncarnation(),
+		Node:        m.config.Name,
+		Addr:        state.Addr,
+		Port:        state.Port,
+		Meta:        meta,
+		Vsn: []uint8{
+			ProtocolVersionMin, ProtocolVersionMax, m.config.ProtocolVersion,
+			m.config.DelegateProtocolMin, m.config.DelegateProtocolMax,
+			m.config.DelegateProtocolVersion,
+		},
+	}
+	notifyCh := make(chan struct{})
+	m.aliveNode(&a, notifyCh, true)
+
+	// Wait for the broadcast or a timeout
+	if m.anyAlive() {
+		var timeoutCh <-chan time.Time
+		if timeout > 0 {
+			timeoutCh = time.After(timeout)
+		}
+		select {
+		case <-notifyCh:
+		case <-timeoutCh:
+			return fmt.Errorf("timeout waiting for update broadcast")
+		}
+	}
+	return nil
+}
+
+// SendTo is used to directly send a message to another node, without
+// the use of the gossip mechanism. This will encode the message as a
+// user-data message, which a delegate will receive through NotifyMsg
+// The actual data is transmitted over UDP, which means this is a
+// best-effort transmission mechanism, and the maximum size of the
+// message is the size of a single UDP datagram, after compression
+func (m *Memberlist) SendTo(to net.Addr, msg []byte) error {
+	// Encode as a user message
+	buf := make([]byte, 1, len(msg)+1)
+	buf[0] = byte(userMsg)
+	buf = append(buf, msg...)
+
+	// Send the message
+	return m.rawSendMsg(to, buf)
+}
+
+// Members returns a list of all known live nodes. The node structures
+// returned must not be modified. If you wish to modify a Node, make a
+// copy first.
+func (m *Memberlist) Members() []*Node {
+	m.nodeLock.RLock()
+	defer m.nodeLock.RUnlock()
+
+	nodes := make([]*Node, 0, len(m.nodes))
+	for _, n := range m.nodes {
+		if n.State != stateDead {
+			nodes = append(nodes, &n.Node)
+		}
+	}
+
+	return nodes
+}
+
+// NumMembers returns the number of alive nodes currently known. Between
+// the time of calling this and calling Members, the number of alive nodes
+// may have changed, so this shouldn't be used to determine how many
+// members will be returned by Members.
+func (m *Memberlist) NumMembers() (alive int) {
+	m.nodeLock.RLock()
+	defer m.nodeLock.RUnlock()
+
+	for _, n := range m.nodes {
+		if n.State != stateDead {
+			alive++
+		}
+	}
+
+	return
+}
+
+// Leave will broadcast a leave message but will not shutdown the background
+// listeners, meaning the node will continue participating in gossip and state
+// updates.
+//
+// This will block until the leave message is successfully broadcasted to
+// a member of the cluster, if any exist or until a specified timeout
+// is reached.
+//
+// This method is safe to call multiple times, but must not be called
+// after the cluster is already shut down.
+func (m *Memberlist) Leave(timeout time.Duration) error {
+	m.startStopLock.Lock()
+	defer m.startStopLock.Unlock()
+
+	if m.shutdown {
+		panic("leave after shutdown")
+	}
+
+	if !m.leave {
+		m.leave = true
+
+		state, ok := m.nodeMap[m.config.Name]
+		if !ok {
+			m.logger.Printf("[WARN] memberlist: Leave but we're not in the node map.")
+			return nil
+		}
+
+		d := dead{
+			Incarnation: state.Incarnation,
+			Node:        state.Name,
+		}
+		m.deadNode(&d)
+
+		// Block until the broadcast goes out
+		if m.anyAlive() {
+			var timeoutCh <-chan time.Time
+			if timeout > 0 {
+				timeoutCh = time.After(timeout)
+			}
+			select {
+			case <-m.leaveBroadcast:
+			case <-timeoutCh:
+				return fmt.Errorf("timeout waiting for leave broadcast")
+			}
+		}
+	}
+
+	return nil
+}
+
+// Check for any other alive node.
+func (m *Memberlist) anyAlive() bool {
+	m.nodeLock.RLock()
+	defer m.nodeLock.RUnlock()
+	for _, n := range m.nodes {
+		if n.State != stateDead && n.Name != m.config.Name {
+			return true
+		}
+	}
+	return false
+}
+
+// ProtocolVersion returns the protocol version currently in use by
+// this memberlist.
+func (m *Memberlist) ProtocolVersion() uint8 {
+	// NOTE: This method exists so that in the future we can control
+	// any locking if necessary, if we change the protocol version at
+	// runtime, etc.
+	return m.config.ProtocolVersion
+}
+
+// Shutdown will stop any background maintanence of network activity
+// for this memberlist, causing it to appear "dead". A leave message
+// will not be broadcasted prior, so the cluster being left will have
+// to detect this node's shutdown using probing. If you wish to more
+// gracefully exit the cluster, call Leave prior to shutting down.
+//
+// This method is safe to call multiple times.
+func (m *Memberlist) Shutdown() error {
+	m.startStopLock.Lock()
+	defer m.startStopLock.Unlock()
+
+	if m.shutdown {
+		return nil
+	}
+
+	m.shutdown = true
+	close(m.shutdownCh)
+	m.deschedule()
+	m.udpListener.Close()
+	m.tcpListener.Close()
+	return nil
+}

vendor/src/github.com/hashicorp/memberlist/merge_delegate.go

@@ -0,0 +1,13 @@
+package memberlist
+
+// MergeDelegate is used to involve a client in
+// a potential cluster merge operation. Namely, when
+// a node does a TCP push/pull (as part of a join),
+// the delegate is involved and allowed to cancel the join
+// based on custom logic. The merge delegate is NOT invoked
+// as part of the push-pull anti-entropy.
+type MergeDelegate interface {
+	// NotifyMerge is invoked when a merge could take place.
+	// Provides a list of the nodes known by the peer.
+	NotifyMerge(peers []*Node) (cancel bool)
+}

vendor/src/github.com/hashicorp/memberlist/net.go

@@ -0,0 +1,852 @@
+package memberlist
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+	"time"
+
+	"github.com/armon/go-metrics"
+	"github.com/hashicorp/go-msgpack/codec"
+)
+
+// This is the minimum and maximum protocol version that we can
+// _understand_. We're allowed to speak at any version within this
+// range. This range is inclusive.
+const (
+	ProtocolVersionMin uint8 = 1
+	ProtocolVersionMax       = 2
+)
+
+// messageType is an integer ID of a type of message that can be received
+// on network channels from other members.
+type messageType uint8
+
+// The list of available message types.
+const (
+	pingMsg messageType = iota
+	indirectPingMsg
+	ackRespMsg
+	suspectMsg
+	aliveMsg
+	deadMsg
+	pushPullMsg
+	compoundMsg
+	userMsg // User mesg, not handled by us
+	compressMsg
+	encryptMsg
+)
+
+// compressionType is used to specify the compression algorithm
+type compressionType uint8
+
+const (
+	lzwAlgo compressionType = iota
+)
+
+const (
+	MetaMaxSize            = 512 // Maximum size for node meta data
+	compoundHeaderOverhead = 2   // Assumed header overhead
+	compoundOverhead       = 2   // Assumed overhead per entry in compoundHeader
+	udpBufSize             = 65536
+	udpRecvBuf             = 2 * 1024 * 1024
+	udpSendBuf             = 1400
+	userMsgOverhead        = 1
+	blockingWarning        = 10 * time.Millisecond // Warn if a UDP packet takes this long to process
+	maxPushStateBytes      = 10 * 1024 * 1024
+)
+
+// ping request sent directly to node
+type ping struct {
+	SeqNo uint32
+
+	// Node is sent so the target can verify they are
+	// the intended recipient. This is to protect again an agent
+	// restart with a new name.
+	Node string
+}
+
+// indirect ping sent to an indirect ndoe
+type indirectPingReq struct {
+	SeqNo  uint32
+	Target []byte
+	Port   uint16
+	Node   string
+}
+
+// ack response is sent for a ping
+type ackResp struct {
+	SeqNo uint32
+}
+
+// suspect is broadcast when we suspect a node is dead
+type suspect struct {
+	Incarnation uint32
+	Node        string
+	From        string // Include who is suspecting
+}
+
+// alive is broadcast when we know a node is alive.
+// Overloaded for nodes joining
+type alive struct {
+	Incarnation uint32
+	Node        string
+	Addr        []byte
+	Port        uint16
+	Meta        []byte
+
+	// The versions of the protocol/delegate that are being spoken, order:
+	// pmin, pmax, pcur, dmin, dmax, dcur
+	Vsn []uint8
+}
+
+// dead is broadcast when we confirm a node is dead
+// Overloaded for nodes leaving
+type dead struct {
+	Incarnation uint32
+	Node        string
+	From        string // Include who is suspecting
+}
+
+// pushPullHeader is used to inform the
+// otherside how many states we are transfering
+type pushPullHeader struct {
+	Nodes        int
+	UserStateLen int  // Encodes the byte lengh of user state
+	Join         bool // Is this a join request or a anti-entropy run
+}
+
+// pushNodeState is used for pushPullReq when we are
+// transfering out node states
+type pushNodeState struct {
+	Name        string
+	Addr        []byte
+	Port        uint16
+	Meta        []byte
+	Incarnation uint32
+	State       nodeStateType
+	Vsn         []uint8 // Protocol versions
+}
+
+// compress is used to wrap an underlying payload
+// using a specified compression algorithm
+type compress struct {
+	Algo compressionType
+	Buf  []byte
+}
+
+// msgHandoff is used to transfer a message between goroutines
+type msgHandoff struct {
+	msgType messageType
+	buf     []byte
+	from    net.Addr
+}
+
+// encryptionVersion returns the encryption version to use
+func (m *Memberlist) encryptionVersion() encryptionVersion {
+	switch m.ProtocolVersion() {
+	case 1:
+		return 0
+	default:
+		return 1
+	}
+}
+
+// setUDPRecvBuf is used to resize the UDP receive window. The function
+// attempts to set the read buffer to `udpRecvBuf` but backs off until
+// the read buffer can be set.
+func setUDPRecvBuf(c *net.UDPConn) {
+	size := udpRecvBuf
+	for {
+		if err := c.SetReadBuffer(size); err == nil {
+			break
+		}
+		size = size / 2
+	}
+}
+
+// tcpListen listens for and handles incoming connections
+func (m *Memberlist) tcpListen() {
+	for {
+		conn, err := m.tcpListener.AcceptTCP()
+		if err != nil {
+			if m.shutdown {
+				break
+			}
+			m.logger.Printf("[ERR] memberlist: Error accepting TCP connection: %s", err)
+			continue
+		}
+		go m.handleConn(conn)
+	}
+}
+
+// handleConn handles a single incoming TCP connection
+func (m *Memberlist) handleConn(conn *net.TCPConn) {
+	m.logger.Printf("[DEBUG] memberlist: Responding to push/pull sync with: %s", conn.RemoteAddr())
+	defer conn.Close()
+	metrics.IncrCounter([]string{"memberlist", "tcp", "accept"}, 1)
+
+	join, remoteNodes, userState, err := m.readRemoteState(conn)
+	if err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to receive remote state: %s", err)
+		return
+	}
+
+	if err := m.sendLocalState(conn, join); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to push local state: %s", err)
+	}
+
+	if err := m.verifyProtocol(remoteNodes); err != nil {
+		m.logger.Printf("[ERR] memberlist: Push/pull verification failed: %s", err)
+		return
+	}
+
+	// Invoke the merge delegate if any
+	if join && m.config.Merge != nil {
+		nodes := make([]*Node, len(remoteNodes))
+		for idx, n := range remoteNodes {
+			nodes[idx] = &Node{
+				Name: n.Name,
+				Addr: n.Addr,
+				Port: n.Port,
+				Meta: n.Meta,
+				PMin: n.Vsn[0],
+				PMax: n.Vsn[1],
+				PCur: n.Vsn[2],
+				DMin: n.Vsn[3],
+				DMax: n.Vsn[4],
+				DCur: n.Vsn[5],
+			}
+		}
+		if m.config.Merge.NotifyMerge(nodes) {
+			m.logger.Printf("[WARN] memberlist: Cluster merge canceled")
+			return
+		}
+	}
+
+	// Merge the membership state
+	m.mergeState(remoteNodes)
+
+	// Invoke the delegate for user state
+	if m.config.Delegate != nil {
+		m.config.Delegate.MergeRemoteState(userState, join)
+	}
+}
+
+// udpListen listens for and handles incoming UDP packets
+func (m *Memberlist) udpListen() {
+	var n int
+	var addr net.Addr
+	var err error
+	var lastPacket time.Time
+	for {
+		// Do a check for potentially blocking operations
+		if !lastPacket.IsZero() && time.Now().Sub(lastPacket) > blockingWarning {
+			diff := time.Now().Sub(lastPacket)
+			m.logger.Printf(
+				"[DEBUG] memberlist: Potential blocking operation. Last command took %v",
+				diff)
+		}
+
+		// Create a new buffer
+		// TODO: Use Sync.Pool eventually
+		buf := make([]byte, udpBufSize)
+
+		// Read a packet
+		n, addr, err = m.udpListener.ReadFrom(buf)
+		if err != nil {
+			if m.shutdown {
+				break
+			}
+			m.logger.Printf("[ERR] memberlist: Error reading UDP packet: %s", err)
+			continue
+		}
+
+		// Check the length
+		if n < 1 {
+			m.logger.Printf("[ERR] memberlist: UDP packet too short (%d bytes). From: %s",
+				len(buf), addr)
+			continue
+		}
+
+		// Capture the current time
+		lastPacket = time.Now()
+
+		// Ingest this packet
+		metrics.IncrCounter([]string{"memberlist", "udp", "received"}, float32(n))
+		m.ingestPacket(buf[:n], addr)
+	}
+}
+
+func (m *Memberlist) ingestPacket(buf []byte, from net.Addr) {
+	// Check if encryption is enabled
+	if m.config.EncryptionEnabled() {
+		// Decrypt the payload
+		plain, err := decryptPayload(m.config.Keyring.GetKeys(), buf, nil)
+		if err != nil {
+			m.logger.Printf("[ERR] memberlist: Decrypt packet failed: %v", err)
+			return
+		}
+
+		// Continue processing the plaintext buffer
+		buf = plain
+	}
+
+	// Handle the command
+	m.handleCommand(buf, from)
+}
+
+func (m *Memberlist) handleCommand(buf []byte, from net.Addr) {
+	// Decode the message type
+	msgType := messageType(buf[0])
+	buf = buf[1:]
+
+	// Switch on the msgType
+	switch msgType {
+	case compoundMsg:
+		m.handleCompound(buf, from)
+	case compressMsg:
+		m.handleCompressed(buf, from)
+
+	case pingMsg:
+		m.handlePing(buf, from)
+	case indirectPingMsg:
+		m.handleIndirectPing(buf, from)
+	case ackRespMsg:
+		m.handleAck(buf, from)
+
+	case suspectMsg:
+		fallthrough
+	case aliveMsg:
+		fallthrough
+	case deadMsg:
+		fallthrough
+	case userMsg:
+		select {
+		case m.handoff <- msgHandoff{msgType, buf, from}:
+		default:
+			m.logger.Printf("[WARN] memberlist: UDP handler queue full, dropping message (%d)", msgType)
+		}
+
+	default:
+		m.logger.Printf("[ERR] memberlist: UDP msg type (%d) not supported. From: %s", msgType, from)
+	}
+}
+
+// udpHandler processes messages received over UDP, but is decoupled
+// from the listener to avoid blocking the listener which may cause
+// ping/ack messages to be delayed.
+func (m *Memberlist) udpHandler() {
+	for {
+		select {
+		case msg := <-m.handoff:
+			msgType := msg.msgType
+			buf := msg.buf
+			from := msg.from
+
+			switch msgType {
+			case suspectMsg:
+				m.handleSuspect(buf, from)
+			case aliveMsg:
+				m.handleAlive(buf, from)
+			case deadMsg:
+				m.handleDead(buf, from)
+			case userMsg:
+				m.handleUser(buf, from)
+			default:
+				m.logger.Printf("[ERR] memberlist: UDP msg type (%d) not supported. From: %s (handler)", msgType, from)
+			}
+
+		case <-m.shutdownCh:
+			return
+		}
+	}
+}
+
+func (m *Memberlist) handleCompound(buf []byte, from net.Addr) {
+	// Decode the parts
+	trunc, parts, err := decodeCompoundMessage(buf)
+	if err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to decode compound request: %s", err)
+		return
+	}
+
+	// Log any truncation
+	if trunc > 0 {
+		m.logger.Printf("[WARN] memberlist: Compound request had %d truncated messages", trunc)
+	}
+
+	// Handle each message
+	for _, part := range parts {
+		m.handleCommand(part, from)
+	}
+}
+
+func (m *Memberlist) handlePing(buf []byte, from net.Addr) {
+	var p ping
+	if err := decode(buf, &p); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to decode ping request: %s", err)
+		return
+	}
+	// If node is provided, verify that it is for us
+	if p.Node != "" && p.Node != m.config.Name {
+		m.logger.Printf("[WARN] memberlist: Got ping for unexpected node '%s'", p.Node)
+		return
+	}
+	ack := ackResp{p.SeqNo}
+	if err := m.encodeAndSendMsg(from, ackRespMsg, &ack); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to send ack: %s", err)
+	}
+}
+
+func (m *Memberlist) handleIndirectPing(buf []byte, from net.Addr) {
+	var ind indirectPingReq
+	if err := decode(buf, &ind); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to decode indirect ping request: %s", err)
+		return
+	}
+
+	// For proto versions < 2, there is no port provided. Mask old
+	// behavior by using the configured port
+	if m.ProtocolVersion() < 2 || ind.Port == 0 {
+		ind.Port = uint16(m.config.BindPort)
+	}
+
+	// Send a ping to the correct host
+	localSeqNo := m.nextSeqNo()
+	ping := ping{SeqNo: localSeqNo, Node: ind.Node}
+	destAddr := &net.UDPAddr{IP: ind.Target, Port: int(ind.Port)}
+
+	// Setup a response handler to relay the ack
+	respHandler := func() {
+		ack := ackResp{ind.SeqNo}
+		if err := m.encodeAndSendMsg(from, ackRespMsg, &ack); err != nil {
+			m.logger.Printf("[ERR] memberlist: Failed to forward ack: %s", err)
+		}
+	}
+	m.setAckHandler(localSeqNo, respHandler, m.config.ProbeTimeout)
+
+	// Send the ping
+	if err := m.encodeAndSendMsg(destAddr, pingMsg, &ping); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to send ping: %s", err)
+	}
+}
+
+func (m *Memberlist) handleAck(buf []byte, from net.Addr) {
+	var ack ackResp
+	if err := decode(buf, &ack); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to decode ack response: %s", err)
+		return
+	}
+	m.invokeAckHandler(ack.SeqNo)
+}
+
+func (m *Memberlist) handleSuspect(buf []byte, from net.Addr) {
+	var sus suspect
+	if err := decode(buf, &sus); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to decode suspect message: %s", err)
+		return
+	}
+	m.suspectNode(&sus)
+}
+
+func (m *Memberlist) handleAlive(buf []byte, from net.Addr) {
+	var live alive
+	if err := decode(buf, &live); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to decode alive message: %s", err)
+		return
+	}
+
+	// For proto versions < 2, there is no port provided. Mask old
+	// behavior by using the configured port
+	if m.ProtocolVersion() < 2 || live.Port == 0 {
+		live.Port = uint16(m.config.BindPort)
+	}
+
+	m.aliveNode(&live, nil, false)
+}
+
+func (m *Memberlist) handleDead(buf []byte, from net.Addr) {
+	var d dead
+	if err := decode(buf, &d); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to decode dead message: %s", err)
+		return
+	}
+	m.deadNode(&d)
+}
+
+// handleUser is used to notify channels of incoming user data
+func (m *Memberlist) handleUser(buf []byte, from net.Addr) {
+	d := m.config.Delegate
+	if d != nil {
+		d.NotifyMsg(buf)
+	}
+}
+
+// handleCompressed is used to unpack a compressed message
+func (m *Memberlist) handleCompressed(buf []byte, from net.Addr) {
+	// Try to decode the payload
+	payload, err := decompressPayload(buf)
+	if err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to decompress payload: %v", err)
+		return
+	}
+
+	// Recursively handle the payload
+	m.handleCommand(payload, from)
+}
+
+// encodeAndSendMsg is used to combine the encoding and sending steps
+func (m *Memberlist) encodeAndSendMsg(to net.Addr, msgType messageType, msg interface{}) error {
+	out, err := encode(msgType, msg)
+	if err != nil {
+		return err
+	}
+	if err := m.sendMsg(to, out.Bytes()); err != nil {
+		return err
+	}
+	return nil
+}
+
+// sendMsg is used to send a UDP message to another host. It will opportunistically
+// create a compoundMsg and piggy back other broadcasts
+func (m *Memberlist) sendMsg(to net.Addr, msg []byte) error {
+	// Check if we can piggy back any messages
+	bytesAvail := udpSendBuf - len(msg) - compoundHeaderOverhead
+	if m.config.EncryptionEnabled() {
+		bytesAvail -= encryptOverhead(m.encryptionVersion())
+	}
+	extra := m.getBroadcasts(compoundOverhead, bytesAvail)
+
+	// Fast path if nothing to piggypack
+	if len(extra) == 0 {
+		return m.rawSendMsg(to, msg)
+	}
+
+	// Join all the messages
+	msgs := make([][]byte, 0, 1+len(extra))
+	msgs = append(msgs, msg)
+	msgs = append(msgs, extra...)
+
+	// Create a compound message
+	compound := makeCompoundMessage(msgs)
+
+	// Send the message
+	return m.rawSendMsg(to, compound.Bytes())
+}
+
+// rawSendMsg is used to send a UDP message to another host without modification
+func (m *Memberlist) rawSendMsg(to net.Addr, msg []byte) error {
+	// Check if we have compression enabled
+	if m.config.EnableCompression {
+		buf, err := compressPayload(msg)
+		if err != nil {
+			m.logger.Printf("[WARN] memberlist: Failed to compress payload: %v", err)
+		} else {
+			// Only use compression if it reduced the size
+			if buf.Len() < len(msg) {
+				msg = buf.Bytes()
+			}
+		}
+	}
+
+	// Check if we have encryption enabled
+	if m.config.EncryptionEnabled() {
+		// Encrypt the payload
+		var buf bytes.Buffer
+		primaryKey := m.config.Keyring.GetPrimaryKey()
+		err := encryptPayload(m.encryptionVersion(), primaryKey, msg, nil, &buf)
+		if err != nil {
+			m.logger.Printf("[ERR] memberlist: Encryption of message failed: %v", err)
+			return err
+		}
+		msg = buf.Bytes()
+	}
+
+	metrics.IncrCounter([]string{"memberlist", "udp", "sent"}, float32(len(msg)))
+	_, err := m.udpListener.WriteTo(msg, to)
+	return err
+}
+
+// sendState is used to initiate a push/pull over TCP with a remote node
+func (m *Memberlist) sendAndReceiveState(addr []byte, port uint16, join bool) ([]pushNodeState, []byte, error) {
+	// Attempt to connect
+	dialer := net.Dialer{Timeout: m.config.TCPTimeout}
+	dest := net.TCPAddr{IP: addr, Port: int(port)}
+	conn, err := dialer.Dial("tcp", dest.String())
+	if err != nil {
+		return nil, nil, err
+	}
+	defer conn.Close()
+	m.logger.Printf("[DEBUG] memberlist: Initiating push/pull sync with: %s", conn.RemoteAddr())
+	metrics.IncrCounter([]string{"memberlist", "tcp", "connect"}, 1)
+
+	// Send our state
+	if err := m.sendLocalState(conn, join); err != nil {
+		return nil, nil, err
+	}
+
+	// Read remote state
+	_, remote, userState, err := m.readRemoteState(conn)
+	if err != nil {
+		err := fmt.Errorf("Reading remote state failed: %v", err)
+		return nil, nil, err
+	}
+
+	// Return the remote state
+	return remote, userState, nil
+}
+
+// sendLocalState is invoked to send our local state over a tcp connection
+func (m *Memberlist) sendLocalState(conn net.Conn, join bool) error {
+	// Setup a deadline
+	conn.SetDeadline(time.Now().Add(m.config.TCPTimeout))
+
+	// Prepare the local node state
+	m.nodeLock.RLock()
+	localNodes := make([]pushNodeState, len(m.nodes))
+	for idx, n := range m.nodes {
+		localNodes[idx].Name = n.Name
+		localNodes[idx].Addr = n.Addr
+		localNodes[idx].Port = n.Port
+		localNodes[idx].Incarnation = n.Incarnation
+		localNodes[idx].State = n.State
+		localNodes[idx].Meta = n.Meta
+		localNodes[idx].Vsn = []uint8{
+			n.PMin, n.PMax, n.PCur,
+			n.DMin, n.DMax, n.DCur,
+		}
+	}
+	m.nodeLock.RUnlock()
+
+	// Get the delegate state
+	var userData []byte
+	if m.config.Delegate != nil {
+		userData = m.config.Delegate.LocalState(join)
+	}
+
+	// Create a bytes buffer writer
+	bufConn := bytes.NewBuffer(nil)
+
+	// Send our node state
+	header := pushPullHeader{Nodes: len(localNodes), UserStateLen: len(userData), Join: join}
+	hd := codec.MsgpackHandle{}
+	enc := codec.NewEncoder(bufConn, &hd)
+
+	// Begin state push
+	if _, err := bufConn.Write([]byte{byte(pushPullMsg)}); err != nil {
+		return err
+	}
+
+	if err := enc.Encode(&header); err != nil {
+		return err
+	}
+	for i := 0; i < header.Nodes; i++ {
+		if err := enc.Encode(&localNodes[i]); err != nil {
+			return err
+		}
+	}
+
+	// Write the user state as well
+	if userData != nil {
+		if _, err := bufConn.Write(userData); err != nil {
+			return err
+		}
+	}
+
+	// Get the send buffer
+	sendBuf := bufConn.Bytes()
+
+	// Check if compresion is enabled
+	if m.config.EnableCompression {
+		compBuf, err := compressPayload(bufConn.Bytes())
+		if err != nil {
+			m.logger.Printf("[ERROR] memberlist: Failed to compress local state: %v", err)
+		} else {
+			sendBuf = compBuf.Bytes()
+		}
+	}
+
+	// Check if encryption is enabled
+	if m.config.EncryptionEnabled() {
+		crypt, err := m.encryptLocalState(sendBuf)
+		if err != nil {
+			m.logger.Printf("[ERROR] memberlist: Failed to encrypt local state: %v", err)
+			return err
+		}
+		sendBuf = crypt
+	}
+
+	// Write out the entire send buffer
+	metrics.IncrCounter([]string{"memberlist", "tcp", "sent"}, float32(len(sendBuf)))
+	if _, err := conn.Write(sendBuf); err != nil {
+		return err
+	}
+	return nil
+}
+
+// encryptLocalState is used to help encrypt local state before sending
+func (m *Memberlist) encryptLocalState(sendBuf []byte) ([]byte, error) {
+	var buf bytes.Buffer
+
+	// Write the encryptMsg byte
+	buf.WriteByte(byte(encryptMsg))
+
+	// Write the size of the message
+	sizeBuf := make([]byte, 4)
+	encVsn := m.encryptionVersion()
+	encLen := encryptedLength(encVsn, len(sendBuf))
+	binary.BigEndian.PutUint32(sizeBuf, uint32(encLen))
+	buf.Write(sizeBuf)
+
+	// Write the encrypted cipher text to the buffer
+	key := m.config.Keyring.GetPrimaryKey()
+	err := encryptPayload(encVsn, key, sendBuf, buf.Bytes()[:5], &buf)
+	if err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+// decryptRemoteState is used to help decrypt the remote state
+func (m *Memberlist) decryptRemoteState(bufConn io.Reader) ([]byte, error) {
+	// Read in enough to determine message length
+	cipherText := bytes.NewBuffer(nil)
+	cipherText.WriteByte(byte(encryptMsg))
+	_, err := io.CopyN(cipherText, bufConn, 4)
+	if err != nil {
+		return nil, err
+	}
+
+	// Ensure we aren't asked to download too much. This is to guard against
+	// an attack vector where a huge amount of state is sent
+	moreBytes := binary.BigEndian.Uint32(cipherText.Bytes()[1:5])
+	if moreBytes > maxPushStateBytes {
+		return nil, fmt.Errorf("Remote node state is larger than limit (%d)", moreBytes)
+	}
+
+	// Read in the rest of the payload
+	_, err = io.CopyN(cipherText, bufConn, int64(moreBytes))
+	if err != nil {
+		return nil, err
+	}
+
+	// Decrypt the cipherText
+	dataBytes := cipherText.Bytes()[:5]
+	cipherBytes := cipherText.Bytes()[5:]
+
+	// Decrypt the payload
+	keys := m.config.Keyring.GetKeys()
+	return decryptPayload(keys, cipherBytes, dataBytes)
+}
+
+// recvRemoteState is used to read the remote state from a connection
+func (m *Memberlist) readRemoteState(conn net.Conn) (bool, []pushNodeState, []byte, error) {
+	// Setup a deadline
+	conn.SetDeadline(time.Now().Add(m.config.TCPTimeout))
+
+	// Created a buffered reader
+	var bufConn io.Reader = bufio.NewReader(conn)
+
+	// Read the message type
+	buf := [1]byte{0}
+	if _, err := bufConn.Read(buf[:]); err != nil {
+		return false, nil, nil, err
+	}
+	msgType := messageType(buf[0])
+
+	// Check if the message is encrypted
+	if msgType == encryptMsg {
+		if !m.config.EncryptionEnabled() {
+			return false, nil, nil,
+				fmt.Errorf("Remote state is encrypted and encryption is not configured")
+		}
+
+		plain, err := m.decryptRemoteState(bufConn)
+		if err != nil {
+			return false, nil, nil, err
+		}
+
+		// Reset message type and bufConn
+		msgType = messageType(plain[0])
+		bufConn = bytes.NewReader(plain[1:])
+	} else if m.config.EncryptionEnabled() {
+		return false, nil, nil,
+			fmt.Errorf("Encryption is configured but remote state is not encrypted")
+	}
+
+	// Get the msgPack decoders
+	hd := codec.MsgpackHandle{}
+	dec := codec.NewDecoder(bufConn, &hd)
+
+	// Check if we have a compressed message
+	if msgType == compressMsg {
+		var c compress
+		if err := dec.Decode(&c); err != nil {
+			return false, nil, nil, err
+		}
+		decomp, err := decompressBuffer(&c)
+		if err != nil {
+			return false, nil, nil, err
+		}
+
+		// Reset the message type
+		msgType = messageType(decomp[0])
+
+		// Create a new bufConn
+		bufConn = bytes.NewReader(decomp[1:])
+
+		// Create a new decoder
+		dec = codec.NewDecoder(bufConn, &hd)
+	}
+
+	// Quit if not push/pull
+	if msgType != pushPullMsg {
+		err := fmt.Errorf("received invalid msgType (%d)", msgType)
+		return false, nil, nil, err
+	}
+
+	// Read the push/pull header
+	var header pushPullHeader
+	if err := dec.Decode(&header); err != nil {
+		return false, nil, nil, err
+	}
+
+	// Allocate space for the transfer
+	remoteNodes := make([]pushNodeState, header.Nodes)
+
+	// Try to decode all the states
+	for i := 0; i < header.Nodes; i++ {
+		if err := dec.Decode(&remoteNodes[i]); err != nil {
+			return false, remoteNodes, nil, err
+		}
+	}
+
+	// Read the remote user state into a buffer
+	var userBuf []byte
+	if header.UserStateLen > 0 {
+		userBuf = make([]byte, header.UserStateLen)
+		bytes, err := io.ReadAtLeast(bufConn, userBuf, header.UserStateLen)
+		if err == nil && bytes != header.UserStateLen {
+			err = fmt.Errorf(
+				"Failed to read full user state (%d / %d)",
+				bytes, header.UserStateLen)
+		}
+		if err != nil {
+			return false, remoteNodes, nil, err
+		}
+	}
+
+	// For proto versions < 2, there is no port provided. Mask old
+	// behavior by using the configured port
+	for idx := range remoteNodes {
+		if m.ProtocolVersion() < 2 || remoteNodes[idx].Port == 0 {
+			remoteNodes[idx].Port = uint16(m.config.BindPort)
+		}
+	}
+
+	return header.Join, remoteNodes, userBuf, nil
+}

vendor/src/github.com/hashicorp/memberlist/queue.go

@@ -0,0 +1,167 @@
+package memberlist
+
+import (
+	"sort"
+	"sync"
+)
+
+// TransmitLimitedQueue is used to queue messages to broadcast to
+// the cluster (via gossip) but limits the number of transmits per
+// message. It also prioritizes messages with lower transmit counts
+// (hence newer messages).
+type TransmitLimitedQueue struct {
+	// NumNodes returns the number of nodes in the cluster. This is
+	// used to determine the retransmit count, which is calculated
+	// based on the log of this.
+	NumNodes func() int
+
+	// RetransmitMult is the multiplier used to determine the maximum
+	// number of retransmissions attempted.
+	RetransmitMult int
+
+	sync.Mutex
+	bcQueue limitedBroadcasts
+}
+
+type limitedBroadcast struct {
+	transmits int // Number of transmissions attempted.
+	b         Broadcast
+}
+type limitedBroadcasts []*limitedBroadcast
+
+// Broadcast is something that can be broadcasted via gossip to
+// the memberlist cluster.
+type Broadcast interface {
+	// Invalidates checks if enqueuing the current broadcast
+	// invalidates a previous broadcast
+	Invalidates(b Broadcast) bool
+
+	// Returns a byte form of the message
+	Message() []byte
+
+	// Finished is invoked when the message will no longer
+	// be broadcast, either due to invalidation or to the
+	// transmit limit being reached
+	Finished()
+}
+
+// QueueBroadcast is used to enqueue a broadcast
+func (q *TransmitLimitedQueue) QueueBroadcast(b Broadcast) {
+	q.Lock()
+	defer q.Unlock()
+
+	// Check if this message invalidates another
+	n := len(q.bcQueue)
+	for i := 0; i < n; i++ {
+		if b.Invalidates(q.bcQueue[i].b) {
+			q.bcQueue[i].b.Finished()
+			copy(q.bcQueue[i:], q.bcQueue[i+1:])
+			q.bcQueue[n-1] = nil
+			q.bcQueue = q.bcQueue[:n-1]
+			n--
+		}
+	}
+
+	// Append to the queue
+	q.bcQueue = append(q.bcQueue, &limitedBroadcast{0, b})
+}
+
+// GetBroadcasts is used to get a number of broadcasts, up to a byte limit
+// and applying a per-message overhead as provided.
+func (q *TransmitLimitedQueue) GetBroadcasts(overhead, limit int) [][]byte {
+	q.Lock()
+	defer q.Unlock()
+
+	// Fast path the default case
+	if len(q.bcQueue) == 0 {
+		return nil
+	}
+
+	transmitLimit := retransmitLimit(q.RetransmitMult, q.NumNodes())
+	bytesUsed := 0
+	var toSend [][]byte
+
+	for i := len(q.bcQueue) - 1; i >= 0; i-- {
+		// Check if this is within our limits
+		b := q.bcQueue[i]
+		msg := b.b.Message()
+		if bytesUsed+overhead+len(msg) > limit {
+			continue
+		}
+
+		// Add to slice to send
+		bytesUsed += overhead + len(msg)
+		toSend = append(toSend, msg)
+
+		// Check if we should stop transmission
+		b.transmits++
+		if b.transmits >= transmitLimit {
+			b.b.Finished()
+			n := len(q.bcQueue)
+			q.bcQueue[i], q.bcQueue[n-1] = q.bcQueue[n-1], nil
+			q.bcQueue = q.bcQueue[:n-1]
+		}
+	}
+
+	// If we are sending anything, we need to re-sort to deal
+	// with adjusted transmit counts
+	if len(toSend) > 0 {
+		q.bcQueue.Sort()
+	}
+	return toSend
+}
+
+// NumQueued returns the number of queued messages
+func (q *TransmitLimitedQueue) NumQueued() int {
+	q.Lock()
+	defer q.Unlock()
+	return len(q.bcQueue)
+}
+
+// Reset clears all the queued messages
+func (q *TransmitLimitedQueue) Reset() {
+	q.Lock()
+	defer q.Unlock()
+	for _, b := range q.bcQueue {
+		b.b.Finished()
+	}
+	q.bcQueue = nil
+}
+
+// Prune will retain the maxRetain latest messages, and the rest
+// will be discarded. This can be used to prevent unbounded queue sizes
+func (q *TransmitLimitedQueue) Prune(maxRetain int) {
+	q.Lock()
+	defer q.Unlock()
+
+	// Do nothing if queue size is less than the limit
+	n := len(q.bcQueue)
+	if n < maxRetain {
+		return
+	}
+
+	// Invalidate the messages we will be removing
+	for i := 0; i < n-maxRetain; i++ {
+		q.bcQueue[i].b.Finished()
+	}
+
+	// Move the messages, and retain only the last maxRetain
+	copy(q.bcQueue[0:], q.bcQueue[n-maxRetain:])
+	q.bcQueue = q.bcQueue[:maxRetain]
+}
+
+func (b limitedBroadcasts) Len() int {
+	return len(b)
+}
+
+func (b limitedBroadcasts) Less(i, j int) bool {
+	return b[i].transmits < b[j].transmits
+}
+
+func (b limitedBroadcasts) Swap(i, j int) {
+	b[i], b[j] = b[j], b[i]
+}
+
+func (b limitedBroadcasts) Sort() {
+	sort.Sort(sort.Reverse(b))
+}

vendor/src/github.com/hashicorp/memberlist/security.go

@@ -0,0 +1,198 @@
+package memberlist
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"fmt"
+	"io"
+)
+
+/*
+
+Encrypted messages are prefixed with an encryptionVersion byte
+that is used for us to be able to properly encode/decode. We
+currently support the following versions:
+
+ 0 - AES-GCM 128, using PKCS7 padding
+ 1 - AES-GCM 128, no padding. Padding not needed, caused bloat.
+
+*/
+type encryptionVersion uint8
+
+const (
+	minEncryptionVersion encryptionVersion = 0
+	maxEncryptionVersion encryptionVersion = 1
+)
+
+const (
+	versionSize    = 1
+	nonceSize      = 12
+	tagSize        = 16
+	maxPadOverhead = 16
+	blockSize      = aes.BlockSize
+)
+
+// pkcs7encode is used to pad a byte buffer to a specific block size using
+// the PKCS7 algorithm. "Ignores" some bytes to compensate for IV
+func pkcs7encode(buf *bytes.Buffer, ignore, blockSize int) {
+	n := buf.Len() - ignore
+	more := blockSize - (n % blockSize)
+	for i := 0; i < more; i++ {
+		buf.WriteByte(byte(more))
+	}
+}
+
+// pkcs7decode is used to decode a buffer that has been padded
+func pkcs7decode(buf []byte, blockSize int) []byte {
+	if len(buf) == 0 {
+		panic("Cannot decode a PKCS7 buffer of zero length")
+	}
+	n := len(buf)
+	last := buf[n-1]
+	n -= int(last)
+	return buf[:n]
+}
+
+// encryptOverhead returns the maximum possible overhead of encryption by version
+func encryptOverhead(vsn encryptionVersion) int {
+	switch vsn {
+	case 0:
+		return 45 // Version: 1, IV: 12, Padding: 16, Tag: 16
+	case 1:
+		return 29 // Version: 1, IV: 12, Tag: 16
+	default:
+		panic("unsupported version")
+	}
+}
+
+// encryptedLength is used to compute the buffer size needed
+// for a message of given length
+func encryptedLength(vsn encryptionVersion, inp int) int {
+	// If we are on version 1, there is no padding
+	if vsn >= 1 {
+		return versionSize + nonceSize + inp + tagSize
+	}
+
+	// Determine the padding size
+	padding := blockSize - (inp % blockSize)
+
+	// Sum the extra parts to get total size
+	return versionSize + nonceSize + inp + padding + tagSize
+}
+
+// encryptPayload is used to encrypt a message with a given key.
+// We make use of AES-128 in GCM mode. New byte buffer is the version,
+// nonce, ciphertext and tag
+func encryptPayload(vsn encryptionVersion, key []byte, msg []byte, data []byte, dst *bytes.Buffer) error {
+	// Get the AES block cipher
+	aesBlock, err := aes.NewCipher(key)
+	if err != nil {
+		return err
+	}
+
+	// Get the GCM cipher mode
+	gcm, err := cipher.NewGCM(aesBlock)
+	if err != nil {
+		return err
+	}
+
+	// Grow the buffer to make room for everything
+	offset := dst.Len()
+	dst.Grow(encryptedLength(vsn, len(msg)))
+
+	// Write the encryption version
+	dst.WriteByte(byte(vsn))
+
+	// Add a random nonce
+	io.CopyN(dst, rand.Reader, nonceSize)
+	afterNonce := dst.Len()
+
+	// Ensure we are correctly padded (only version 0)
+	if vsn == 0 {
+		io.Copy(dst, bytes.NewReader(msg))
+		pkcs7encode(dst, offset+versionSize+nonceSize, aes.BlockSize)
+	}
+
+	// Encrypt message using GCM
+	slice := dst.Bytes()[offset:]
+	nonce := slice[versionSize : versionSize+nonceSize]
+
+	// Message source depends on the encryption version.
+	// Version 0 uses padding, version 1 does not
+	var src []byte
+	if vsn == 0 {
+		src = slice[versionSize+nonceSize:]
+	} else {
+		src = msg
+	}
+	out := gcm.Seal(nil, nonce, src, data)
+
+	// Truncate the plaintext, and write the cipher text
+	dst.Truncate(afterNonce)
+	dst.Write(out)
+	return nil
+}
+
+// decryptMessage performs the actual decryption of ciphertext. This is in its
+// own function to allow it to be called on all keys easily.
+func decryptMessage(key, msg []byte, data []byte) ([]byte, error) {
+	// Get the AES block cipher
+	aesBlock, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	// Get the GCM cipher mode
+	gcm, err := cipher.NewGCM(aesBlock)
+	if err != nil {
+		return nil, err
+	}
+
+	// Decrypt the message
+	nonce := msg[versionSize : versionSize+nonceSize]
+	ciphertext := msg[versionSize+nonceSize:]
+	plain, err := gcm.Open(nil, nonce, ciphertext, data)
+	if err != nil {
+		return nil, err
+	}
+
+	// Success!
+	return plain, nil
+}
+
+// decryptPayload is used to decrypt a message with a given key,
+// and verify it's contents. Any padding will be removed, and a
+// slice to the plaintext is returned. Decryption is done IN PLACE!
+func decryptPayload(keys [][]byte, msg []byte, data []byte) ([]byte, error) {
+	// Ensure we have at least one byte
+	if len(msg) == 0 {
+		return nil, fmt.Errorf("Cannot decrypt empty payload")
+	}
+
+	// Verify the version
+	vsn := encryptionVersion(msg[0])
+	if vsn > maxEncryptionVersion {
+		return nil, fmt.Errorf("Unsupported encryption version %d", msg[0])
+	}
+
+	// Ensure the length is sane
+	if len(msg) < encryptedLength(vsn, 0) {
+		return nil, fmt.Errorf("Payload is too small to decrypt: %d", len(msg))
+	}
+
+	for _, key := range keys {
+		plain, err := decryptMessage(key, msg, data)
+		if err == nil {
+			// Remove the PKCS7 padding for vsn 0
+			if vsn == 0 {
+				return pkcs7decode(plain, aes.BlockSize), nil
+			} else {
+				return plain, nil
+			}
+		}
+	}
+
+	return nil, fmt.Errorf("No installed keys could decrypt the message")
+}

vendor/src/github.com/hashicorp/memberlist/state.go

@@ -0,0 +1,916 @@
+package memberlist
+
+import (
+	"bytes"
+	"fmt"
+	"math"
+	"math/rand"
+	"net"
+	"sync/atomic"
+	"time"
+
+	"github.com/armon/go-metrics"
+)
+
+type nodeStateType int
+
+const (
+	stateAlive nodeStateType = iota
+	stateSuspect
+	stateDead
+)
+
+// Node represents a node in the cluster.
+type Node struct {
+	Name string
+	Addr net.IP
+	Port uint16
+	Meta []byte // Metadata from the delegate for this node.
+	PMin uint8  // Minimum protocol version this understands
+	PMax uint8  // Maximum protocol version this understands
+	PCur uint8  // Current version node is speaking
+	DMin uint8  // Min protocol version for the delegate to understand
+	DMax uint8  // Max protocol version for the delegate to understand
+	DCur uint8  // Current version delegate is speaking
+}
+
+// NodeState is used to manage our state view of another node
+type nodeState struct {
+	Node
+	Incarnation uint32        // Last known incarnation number
+	State       nodeStateType // Current state
+	StateChange time.Time     // Time last state change happened
+}
+
+// ackHandler is used to register handlers for incoming acks
+type ackHandler struct {
+	handler func()
+	timer   *time.Timer
+}
+
+// Schedule is used to ensure the Tick is performed periodically. This
+// function is safe to call multiple times. If the memberlist is already
+// scheduled, then it won't do anything.
+func (m *Memberlist) schedule() {
+	m.tickerLock.Lock()
+	defer m.tickerLock.Unlock()
+
+	// If we already have tickers, then don't do anything, since we're
+	// scheduled
+	if len(m.tickers) > 0 {
+		return
+	}
+
+	// Create the stop tick channel, a blocking channel. We close this
+	// when we should stop the tickers.
+	stopCh := make(chan struct{})
+
+	// Create a new probeTicker
+	if m.config.ProbeInterval > 0 {
+		t := time.NewTicker(m.config.ProbeInterval)
+		go m.triggerFunc(m.config.ProbeInterval, t.C, stopCh, m.probe)
+		m.tickers = append(m.tickers, t)
+	}
+
+	// Create a push pull ticker if needed
+	if m.config.PushPullInterval > 0 {
+		go m.pushPullTrigger(stopCh)
+	}
+
+	// Create a gossip ticker if needed
+	if m.config.GossipInterval > 0 && m.config.GossipNodes > 0 {
+		t := time.NewTicker(m.config.GossipInterval)
+		go m.triggerFunc(m.config.GossipInterval, t.C, stopCh, m.gossip)
+		m.tickers = append(m.tickers, t)
+	}
+
+	// If we made any tickers, then record the stopTick channel for
+	// later.
+	if len(m.tickers) > 0 {
+		m.stopTick = stopCh
+	}
+}
+
+// triggerFunc is used to trigger a function call each time a
+// message is received until a stop tick arrives.
+func (m *Memberlist) triggerFunc(stagger time.Duration, C <-chan time.Time, stop <-chan struct{}, f func()) {
+	// Use a random stagger to avoid syncronizing
+	randStagger := time.Duration(uint64(rand.Int63()) % uint64(stagger))
+	select {
+	case <-time.After(randStagger):
+	case <-stop:
+		return
+	}
+	for {
+		select {
+		case <-C:
+			f()
+		case <-stop:
+			return
+		}
+	}
+}
+
+// pushPullTrigger is used to periodically trigger a push/pull until
+// a stop tick arrives. We don't use triggerFunc since the push/pull
+// timer is dynamically scaled based on cluster size to avoid network
+// saturation
+func (m *Memberlist) pushPullTrigger(stop <-chan struct{}) {
+	interval := m.config.PushPullInterval
+
+	// Use a random stagger to avoid syncronizing
+	randStagger := time.Duration(uint64(rand.Int63()) % uint64(interval))
+	select {
+	case <-time.After(randStagger):
+	case <-stop:
+		return
+	}
+
+	// Tick using a dynamic timer
+	for {
+		m.nodeLock.RLock()
+		tickTime := pushPullScale(interval, len(m.nodes))
+		m.nodeLock.RUnlock()
+		select {
+		case <-time.After(tickTime):
+			m.pushPull()
+		case <-stop:
+			return
+		}
+	}
+}
+
+// Deschedule is used to stop the background maintenence. This is safe
+// to call multiple times.
+func (m *Memberlist) deschedule() {
+	m.tickerLock.Lock()
+	defer m.tickerLock.Unlock()
+
+	// If we have no tickers, then we aren't scheduled.
+	if len(m.tickers) == 0 {
+		return
+	}
+
+	// Close the stop channel so all the ticker listeners stop.
+	close(m.stopTick)
+
+	// Explicitly stop all the tickers themselves so they don't take
+	// up any more resources, and get rid of the list.
+	for _, t := range m.tickers {
+		t.Stop()
+	}
+	m.tickers = nil
+}
+
+// Tick is used to perform a single round of failure detection and gossip
+func (m *Memberlist) probe() {
+	// Track the number of indexes we've considered probing
+	numCheck := 0
+START:
+	m.nodeLock.RLock()
+
+	// Make sure we don't wrap around infinitely
+	if numCheck >= len(m.nodes) {
+		m.nodeLock.RUnlock()
+		return
+	}
+
+	// Handle the wrap around case
+	if m.probeIndex >= len(m.nodes) {
+		m.nodeLock.RUnlock()
+		m.resetNodes()
+		m.probeIndex = 0
+		numCheck++
+		goto START
+	}
+
+	// Determine if we should probe this node
+	skip := false
+	var node nodeState
+
+	node = *m.nodes[m.probeIndex]
+	if node.Name == m.config.Name {
+		skip = true
+	} else if node.State == stateDead {
+		skip = true
+	}
+
+	// Potentially skip
+	m.nodeLock.RUnlock()
+	m.probeIndex++
+	if skip {
+		numCheck++
+		goto START
+	}
+
+	// Probe the specific node
+	m.probeNode(&node)
+}
+
+// probeNode handles a single round of failure checking on a node
+func (m *Memberlist) probeNode(node *nodeState) {
+	defer metrics.MeasureSince([]string{"memberlist", "probeNode"}, time.Now())
+
+	// Send a ping to the node
+	ping := ping{SeqNo: m.nextSeqNo(), Node: node.Name}
+	destAddr := &net.UDPAddr{IP: node.Addr, Port: int(node.Port)}
+
+	// Setup an ack handler
+	ackCh := make(chan bool, m.config.IndirectChecks+1)
+	m.setAckChannel(ping.SeqNo, ackCh, m.config.ProbeInterval)
+
+	// Send the ping message
+	if err := m.encodeAndSendMsg(destAddr, pingMsg, &ping); err != nil {
+		m.logger.Printf("[ERR] memberlist: Failed to send ping: %s", err)
+		return
+	}
+
+	// Wait for response or round-trip-time
+	select {
+	case v := <-ackCh:
+		if v == true {
+			return
+		}
+
+		// As an edge case, if we get a timeout, we need to re-enqueue it
+		// here to break out of the select below
+		if v == false {
+			ackCh <- v
+		}
+	case <-time.After(m.config.ProbeTimeout):
+	}
+
+	// Get some random live nodes
+	m.nodeLock.RLock()
+	excludes := []string{m.config.Name, node.Name}
+	kNodes := kRandomNodes(m.config.IndirectChecks, excludes, m.nodes)
+	m.nodeLock.RUnlock()
+
+	// Attempt an indirect ping
+	ind := indirectPingReq{SeqNo: ping.SeqNo, Target: node.Addr, Port: node.Port, Node: node.Name}
+	for _, peer := range kNodes {
+		destAddr := &net.UDPAddr{IP: peer.Addr, Port: int(peer.Port)}
+		if err := m.encodeAndSendMsg(destAddr, indirectPingMsg, &ind); err != nil {
+			m.logger.Printf("[ERR] memberlist: Failed to send indirect ping: %s", err)
+		}
+	}
+
+	// Wait for the acks or timeout
+	select {
+	case v := <-ackCh:
+		if v == true {
+			return
+		}
+	}
+
+	// No acks received from target, suspect
+	m.logger.Printf("[INFO] memberlist: Suspect %s has failed, no acks received", node.Name)
+	s := suspect{Incarnation: node.Incarnation, Node: node.Name, From: m.config.Name}
+	m.suspectNode(&s)
+}
+
+// resetNodes is used when the tick wraps around. It will reap the
+// dead nodes and shuffle the node list.
+func (m *Memberlist) resetNodes() {
+	m.nodeLock.Lock()
+	defer m.nodeLock.Unlock()
+
+	// Move the dead nodes
+	deadIdx := moveDeadNodes(m.nodes)
+
+	// Deregister the dead nodes
+	for i := deadIdx; i < len(m.nodes); i++ {
+		delete(m.nodeMap, m.nodes[i].Name)
+		m.nodes[i] = nil
+	}
+
+	// Trim the nodes to exclude the dead nodes
+	m.nodes = m.nodes[0:deadIdx]
+
+	// Shuffle live nodes
+	shuffleNodes(m.nodes)
+}
+
+// gossip is invoked every GossipInterval period to broadcast our gossip
+// messages to a few random nodes.
+func (m *Memberlist) gossip() {
+	defer metrics.MeasureSince([]string{"memberlist", "gossip"}, time.Now())
+
+	// Get some random live nodes
+	m.nodeLock.RLock()
+	excludes := []string{m.config.Name}
+	kNodes := kRandomNodes(m.config.GossipNodes, excludes, m.nodes)
+	m.nodeLock.RUnlock()
+
+	// Compute the bytes available
+	bytesAvail := udpSendBuf - compoundHeaderOverhead
+	if m.config.EncryptionEnabled() {
+		bytesAvail -= encryptOverhead(m.encryptionVersion())
+	}
+
+	for _, node := range kNodes {
+		// Get any pending broadcasts
+		msgs := m.getBroadcasts(compoundOverhead, bytesAvail)
+		if len(msgs) == 0 {
+			return
+		}
+
+		// Create a compound message
+		compound := makeCompoundMessage(msgs)
+
+		// Send the compound message
+		destAddr := &net.UDPAddr{IP: node.Addr, Port: int(node.Port)}
+		if err := m.rawSendMsg(destAddr, compound.Bytes()); err != nil {
+			m.logger.Printf("[ERR] memberlist: Failed to send gossip to %s: %s", destAddr, err)
+		}
+	}
+}
+
+// pushPull is invoked periodically to randomly perform a complete state
+// exchange. Used to ensure a high level of convergence, but is also
+// reasonably expensive as the entire state of this node is exchanged
+// with the other node.
+func (m *Memberlist) pushPull() {
+	// Get a random live node
+	m.nodeLock.RLock()
+	excludes := []string{m.config.Name}
+	nodes := kRandomNodes(1, excludes, m.nodes)
+	m.nodeLock.RUnlock()
+
+	// If no nodes, bail
+	if len(nodes) == 0 {
+		return
+	}
+	node := nodes[0]
+
+	// Attempt a push pull
+	if err := m.pushPullNode(node.Addr, node.Port, false); err != nil {
+		m.logger.Printf("[ERR] memberlist: Push/Pull with %s failed: %s", node.Name, err)
+	}
+}
+
+// pushPullNode does a complete state exchange with a specific node.
+func (m *Memberlist) pushPullNode(addr []byte, port uint16, join bool) error {
+	defer metrics.MeasureSince([]string{"memberlist", "pushPullNode"}, time.Now())
+
+	// Attempt to send and receive with the node
+	remote, userState, err := m.sendAndReceiveState(addr, port, join)
+	if err != nil {
+		return err
+	}
+
+	if err := m.verifyProtocol(remote); err != nil {
+		return err
+	}
+
+	// Invoke the merge delegate if any
+	if join && m.config.Merge != nil {
+		nodes := make([]*Node, len(remote))
+		for idx, n := range remote {
+			nodes[idx] = &Node{
+				Name: n.Name,
+				Addr: n.Addr,
+				Port: n.Port,
+				Meta: n.Meta,
+				PMin: n.Vsn[0],
+				PMax: n.Vsn[1],
+				PCur: n.Vsn[2],
+				DMin: n.Vsn[3],
+				DMax: n.Vsn[4],
+				DCur: n.Vsn[5],
+			}
+		}
+		if m.config.Merge.NotifyMerge(nodes) {
+			m.logger.Printf("[WARN] memberlist: Cluster merge canceled")
+			return fmt.Errorf("Merge canceled")
+		}
+	}
+
+	// Merge the state
+	m.mergeState(remote)
+
+	// Invoke the delegate
+	if m.config.Delegate != nil {
+		m.config.Delegate.MergeRemoteState(userState, join)
+	}
+	return nil
+}
+
+// verifyProtocol verifies that all the remote nodes can speak with our
+// nodes and vice versa on both the core protocol as well as the
+// delegate protocol level.
+//
+// The verification works by finding the maximum minimum and
+// minimum maximum understood protocol and delegate versions. In other words,
+// it finds the common denominator of protocol and delegate version ranges
+// for the entire cluster.
+//
+// After this, it goes through the entire cluster (local and remote) and
+// verifies that everyone's speaking protocol versions satisfy this range.
+// If this passes, it means that every node can understand each other.
+func (m *Memberlist) verifyProtocol(remote []pushNodeState) error {
+	m.nodeLock.RLock()
+	defer m.nodeLock.RUnlock()
+
+	// Maximum minimum understood and minimum maximum understood for both
+	// the protocol and delegate versions. We use this to verify everyone
+	// can be understood.
+	var maxpmin, minpmax uint8
+	var maxdmin, mindmax uint8
+	minpmax = math.MaxUint8
+	mindmax = math.MaxUint8
+
+	for _, rn := range remote {
+		// If the node isn't alive, then skip it
+		if rn.State != stateAlive {
+			continue
+		}
+
+		// Skip nodes that don't have versions set, it just means
+		// their version is zero.
+		if len(rn.Vsn) == 0 {
+			continue
+		}
+
+		if rn.Vsn[0] > maxpmin {
+			maxpmin = rn.Vsn[0]
+		}
+
+		if rn.Vsn[1] < minpmax {
+			minpmax = rn.Vsn[1]
+		}
+
+		if rn.Vsn[3] > maxdmin {
+			maxdmin = rn.Vsn[3]
+		}
+
+		if rn.Vsn[4] < mindmax {
+			mindmax = rn.Vsn[4]
+		}
+	}
+
+	for _, n := range m.nodes {
+		// Ignore non-alive nodes
+		if n.State != stateAlive {
+			continue
+		}
+
+		if n.PMin > maxpmin {
+			maxpmin = n.PMin
+		}
+
+		if n.PMax < minpmax {
+			minpmax = n.PMax
+		}
+
+		if n.DMin > maxdmin {
+			maxdmin = n.DMin
+		}
+
+		if n.DMax < mindmax {
+			mindmax = n.DMax
+		}
+	}
+
+	// Now that we definitively know the minimum and maximum understood
+	// version that satisfies the whole cluster, we verify that every
+	// node in the cluster satisifies this.
+	for _, n := range remote {
+		var nPCur, nDCur uint8
+		if len(n.Vsn) > 0 {
+			nPCur = n.Vsn[2]
+			nDCur = n.Vsn[5]
+		}
+
+		if nPCur < maxpmin || nPCur > minpmax {
+			return fmt.Errorf(
+				"Node '%s' protocol version (%d) is incompatible: [%d, %d]",
+				n.Name, nPCur, maxpmin, minpmax)
+		}
+
+		if nDCur < maxdmin || nDCur > mindmax {
+			return fmt.Errorf(
+				"Node '%s' delegate protocol version (%d) is incompatible: [%d, %d]",
+				n.Name, nDCur, maxdmin, mindmax)
+		}
+	}
+
+	for _, n := range m.nodes {
+		nPCur := n.PCur
+		nDCur := n.DCur
+
+		if nPCur < maxpmin || nPCur > minpmax {
+			return fmt.Errorf(
+				"Node '%s' protocol version (%d) is incompatible: [%d, %d]",
+				n.Name, nPCur, maxpmin, minpmax)
+		}
+
+		if nDCur < maxdmin || nDCur > mindmax {
+			return fmt.Errorf(
+				"Node '%s' delegate protocol version (%d) is incompatible: [%d, %d]",
+				n.Name, nDCur, maxdmin, mindmax)
+		}
+	}
+
+	return nil
+}
+
+// nextSeqNo returns a usable sequence number in a thread safe way
+func (m *Memberlist) nextSeqNo() uint32 {
+	return atomic.AddUint32(&m.sequenceNum, 1)
+}
+
+// nextIncarnation returns the next incarnation number in a thread safe way
+func (m *Memberlist) nextIncarnation() uint32 {
+	return atomic.AddUint32(&m.incarnation, 1)
+}
+
+// setAckChannel is used to attach a channel to receive a message when
+// an ack with a given sequence number is received. The channel gets sent
+// false on timeout
+func (m *Memberlist) setAckChannel(seqNo uint32, ch chan bool, timeout time.Duration) {
+	// Create a handler function
+	handler := func() {
+		select {
+		case ch <- true:
+		default:
+		}
+	}
+
+	// Add the handler
+	ah := &ackHandler{handler, nil}
+	m.ackLock.Lock()
+	m.ackHandlers[seqNo] = ah
+	m.ackLock.Unlock()
+
+	// Setup a reaping routing
+	ah.timer = time.AfterFunc(timeout, func() {
+		m.ackLock.Lock()
+		delete(m.ackHandlers, seqNo)
+		m.ackLock.Unlock()
+		select {
+		case ch <- false:
+		default:
+		}
+	})
+}
+
+// setAckHandler is used to attach a handler to be invoked when an
+// ack with a given sequence number is received. If a timeout is reached,
+// the handler is deleted
+func (m *Memberlist) setAckHandler(seqNo uint32, handler func(), timeout time.Duration) {
+	// Add the handler
+	ah := &ackHandler{handler, nil}
+	m.ackLock.Lock()
+	m.ackHandlers[seqNo] = ah
+	m.ackLock.Unlock()
+
+	// Setup a reaping routing
+	ah.timer = time.AfterFunc(timeout, func() {
+		m.ackLock.Lock()
+		delete(m.ackHandlers, seqNo)
+		m.ackLock.Unlock()
+	})
+}
+
+// Invokes an Ack handler if any is associated, and reaps the handler immediately
+func (m *Memberlist) invokeAckHandler(seqNo uint32) {
+	m.ackLock.Lock()
+	ah, ok := m.ackHandlers[seqNo]
+	delete(m.ackHandlers, seqNo)
+	m.ackLock.Unlock()
+	if !ok {
+		return
+	}
+	ah.timer.Stop()
+	ah.handler()
+}
+
+// aliveNode is invoked by the network layer when we get a message about a
+// live node.
+func (m *Memberlist) aliveNode(a *alive, notify chan struct{}, bootstrap bool) {
+	m.nodeLock.Lock()
+	defer m.nodeLock.Unlock()
+	state, ok := m.nodeMap[a.Node]
+
+	// It is possible that during a Leave(), there is already an aliveMsg
+	// in-queue to be processed but blocked by the locks above. If we let
+	// that aliveMsg process, it'll cause us to re-join the cluster. This
+	// ensures that we don't.
+	if m.leave && a.Node == m.config.Name {
+		return
+	}
+
+	// Check if we've never seen this node before, and if not, then
+	// store this node in our node map.
+	if !ok {
+		state = &nodeState{
+			Node: Node{
+				Name: a.Node,
+				Addr: a.Addr,
+				Port: a.Port,
+				Meta: a.Meta,
+			},
+			State: stateDead,
+		}
+
+		// Add to map
+		m.nodeMap[a.Node] = state
+
+		// Get a random offset. This is important to ensure
+		// the failure detection bound is low on average. If all
+		// nodes did an append, failure detection bound would be
+		// very high.
+		n := len(m.nodes)
+		offset := randomOffset(n)
+
+		// Add at the end and swap with the node at the offset
+		m.nodes = append(m.nodes, state)
+		m.nodes[offset], m.nodes[n] = m.nodes[n], m.nodes[offset]
+	}
+
+	// Check if this address is different than the existing node
+	if !bytes.Equal([]byte(state.Addr), a.Addr) || state.Port != a.Port {
+		m.logger.Printf("[ERR] memberlist: Conflicting address for %s. Mine: %v:%d Theirs: %v:%d",
+			state.Name, state.Addr, state.Port, net.IP(a.Addr), a.Port)
+
+		// Inform the conflict delegate if provided
+		if m.config.Conflict != nil {
+			other := Node{
+				Name: a.Node,
+				Addr: a.Addr,
+				Port: a.Port,
+				Meta: a.Meta,
+			}
+			m.config.Conflict.NotifyConflict(&state.Node, &other)
+		}
+		return
+	}
+
+	// Bail if the incarnation number is older, and this is not about us
+	isLocalNode := state.Name == m.config.Name
+	if a.Incarnation <= state.Incarnation && !isLocalNode {
+		return
+	}
+
+	// Bail if strictly less and this is about us
+	if a.Incarnation < state.Incarnation && isLocalNode {
+		return
+	}
+
+	// Update metrics
+	metrics.IncrCounter([]string{"memberlist", "msg", "alive"}, 1)
+
+	// Store the old state and meta data
+	oldState := state.State
+	oldMeta := state.Meta
+
+	// If this is us we need to refute, otherwise re-broadcast
+	if !bootstrap && isLocalNode {
+		// Compute the version vector
+		versions := []uint8{
+			state.PMin, state.PMax, state.PCur,
+			state.DMin, state.DMax, state.DCur,
+		}
+
+		// If the Incarnation is the same, we need special handling, since it
+		// possible for the following situation to happen:
+		// 1) Start with configuration C, join cluster
+		// 2) Hard fail / Kill / Shutdown
+		// 3) Restart with configuration C', join cluster
+		//
+		// In this case, other nodes and the local node see the same incarnation,
+		// but the values may not be the same. For this reason, we always
+		// need to do an equality check for this Incarnation. In most cases,
+		// we just ignore, but we may need to refute.
+		//
+		if a.Incarnation == state.Incarnation &&
+			bytes.Equal(a.Meta, state.Meta) &&
+			bytes.Equal(a.Vsn, versions) {
+			return
+		}
+
+		inc := m.nextIncarnation()
+		for a.Incarnation >= inc {
+			inc = m.nextIncarnation()
+		}
+		state.Incarnation = inc
+
+		a := alive{
+			Incarnation: inc,
+			Node:        state.Name,
+			Addr:        state.Addr,
+			Port:        state.Port,
+			Meta:        state.Meta,
+			Vsn:         versions,
+		}
+		m.encodeBroadcastNotify(a.Node, aliveMsg, a, notify)
+		m.logger.Printf("[WARN] memberlist: Refuting an alive message")
+	} else {
+		m.encodeBroadcastNotify(a.Node, aliveMsg, a, notify)
+
+		// Update protocol versions if it arrived
+		if len(a.Vsn) > 0 {
+			state.PMin = a.Vsn[0]
+			state.PMax = a.Vsn[1]
+			state.PCur = a.Vsn[2]
+			state.DMin = a.Vsn[3]
+			state.DMax = a.Vsn[4]
+			state.DCur = a.Vsn[5]
+		}
+
+		// Update the state and incarnation number
+		state.Incarnation = a.Incarnation
+		state.Meta = a.Meta
+		if state.State != stateAlive {
+			state.State = stateAlive
+			state.StateChange = time.Now()
+		}
+	}
+
+	// Notify the delegate of any relevant updates
+	if m.config.Events != nil {
+		if oldState == stateDead {
+			// if Dead -> Alive, notify of join
+			m.config.Events.NotifyJoin(&state.Node)
+
+		} else if !bytes.Equal(oldMeta, state.Meta) {
+			// if Meta changed, trigger an update notification
+			m.config.Events.NotifyUpdate(&state.Node)
+		}
+	}
+}
+
+// suspectNode is invoked by the network layer when we get a message
+// about a suspect node
+func (m *Memberlist) suspectNode(s *suspect) {
+	m.nodeLock.Lock()
+	defer m.nodeLock.Unlock()
+	state, ok := m.nodeMap[s.Node]
+
+	// If we've never heard about this node before, ignore it
+	if !ok {
+		return
+	}
+
+	// Ignore old incarnation numbers
+	if s.Incarnation < state.Incarnation {
+		return
+	}
+
+	// Ignore non-alive nodes
+	if state.State != stateAlive {
+		return
+	}
+
+	// If this is us we need to refute, otherwise re-broadcast
+	if state.Name == m.config.Name {
+		inc := m.nextIncarnation()
+		for s.Incarnation >= inc {
+			inc = m.nextIncarnation()
+		}
+		state.Incarnation = inc
+
+		a := alive{
+			Incarnation: inc,
+			Node:        state.Name,
+			Addr:        state.Addr,
+			Port:        state.Port,
+			Meta:        state.Meta,
+			Vsn: []uint8{
+				state.PMin, state.PMax, state.PCur,
+				state.DMin, state.DMax, state.DCur,
+			},
+		}
+		m.encodeAndBroadcast(s.Node, aliveMsg, a)
+		m.logger.Printf("[WARN] memberlist: Refuting a suspect message (from: %s)", s.From)
+		return // Do not mark ourself suspect
+	} else {
+		m.encodeAndBroadcast(s.Node, suspectMsg, s)
+	}
+
+	// Update metrics
+	metrics.IncrCounter([]string{"memberlist", "msg", "suspect"}, 1)
+
+	// Update the state
+	state.Incarnation = s.Incarnation
+	state.State = stateSuspect
+	changeTime := time.Now()
+	state.StateChange = changeTime
+
+	// Setup a timeout for this
+	timeout := suspicionTimeout(m.config.SuspicionMult, len(m.nodes), m.config.ProbeInterval)
+	time.AfterFunc(timeout, func() {
+		m.nodeLock.Lock()
+		state, ok := m.nodeMap[s.Node]
+		timeout := ok && state.State == stateSuspect && state.StateChange == changeTime
+		m.nodeLock.Unlock()
+
+		if timeout {
+			m.suspectTimeout(state)
+		}
+	})
+}
+
+// suspectTimeout is invoked when a suspect timeout has occurred
+func (m *Memberlist) suspectTimeout(n *nodeState) {
+	// Construct a dead message
+	m.logger.Printf("[INFO] memberlist: Marking %s as failed, suspect timeout reached", n.Name)
+	d := dead{Incarnation: n.Incarnation, Node: n.Name, From: m.config.Name}
+	m.deadNode(&d)
+}
+
+// deadNode is invoked by the network layer when we get a message
+// about a dead node
+func (m *Memberlist) deadNode(d *dead) {
+	m.nodeLock.Lock()
+	defer m.nodeLock.Unlock()
+	state, ok := m.nodeMap[d.Node]
+
+	// If we've never heard about this node before, ignore it
+	if !ok {
+		return
+	}
+
+	// Ignore old incarnation numbers
+	if d.Incarnation < state.Incarnation {
+		return
+	}
+
+	// Ignore if node is already dead
+	if state.State == stateDead {
+		return
+	}
+
+	// Check if this is us
+	if state.Name == m.config.Name {
+		// If we are not leaving we need to refute
+		if !m.leave {
+			inc := m.nextIncarnation()
+			for d.Incarnation >= inc {
+				inc = m.nextIncarnation()
+			}
+			state.Incarnation = inc
+
+			a := alive{
+				Incarnation: inc,
+				Node:        state.Name,
+				Addr:        state.Addr,
+				Port:        state.Port,
+				Meta:        state.Meta,
+				Vsn: []uint8{
+					state.PMin, state.PMax, state.PCur,
+					state.DMin, state.DMax, state.DCur,
+				},
+			}
+			m.encodeAndBroadcast(d.Node, aliveMsg, a)
+			m.logger.Printf("[WARN] memberlist: Refuting a dead message (from: %s)", d.From)
+			return // Do not mark ourself dead
+		}
+
+		// If we are leaving, we broadcast and wait
+		m.encodeBroadcastNotify(d.Node, deadMsg, d, m.leaveBroadcast)
+	} else {
+		m.encodeAndBroadcast(d.Node, deadMsg, d)
+	}
+
+	// Update metrics
+	metrics.IncrCounter([]string{"memberlist", "msg", "dead"}, 1)
+
+	// Update the state
+	state.Incarnation = d.Incarnation
+	state.State = stateDead
+	state.StateChange = time.Now()
+
+	// Notify of death
+	if m.config.Events != nil {
+		m.config.Events.NotifyLeave(&state.Node)
+	}
+}
+
+// mergeState is invoked by the network layer when we get a Push/Pull
+// state transfer
+func (m *Memberlist) mergeState(remote []pushNodeState) {
+	for _, r := range remote {
+		switch r.State {
+		case stateAlive:
+			a := alive{
+				Incarnation: r.Incarnation,
+				Node:        r.Name,
+				Addr:        r.Addr,
+				Port:        r.Port,
+				Meta:        r.Meta,
+				Vsn:         r.Vsn,
+			}
+			m.aliveNode(&a, nil, false)
+
+		case stateDead:
+			// If the remote node belives a node is dead, we prefer to
+			// suspect that node instead of declaring it dead instantly
+			fallthrough
+		case stateSuspect:
+			s := suspect{Incarnation: r.Incarnation, Node: r.Name, From: m.config.Name}
+			m.suspectNode(&s)
+		}
+	}
+}

vendor/src/github.com/hashicorp/memberlist/todo.md

@@ -0,0 +1,6 @@
+# TODO
+* Dynamic RTT discovery
+    * Compute 99th percentile for ping/ack
+    * Better lower bound for ping/ack, faster failure detection
+* Dynamic MTU discovery
+    * Prevent lost updates, increases efficiency

vendor/src/github.com/hashicorp/memberlist/util.go

@@ -0,0 +1,325 @@
+package memberlist
+
+import (
+	"bytes"
+	"compress/lzw"
+	"encoding/binary"
+	"fmt"
+	"github.com/hashicorp/go-msgpack/codec"
+	"io"
+	"math"
+	"math/rand"
+	"net"
+	"time"
+)
+
+// pushPullScale is the minimum number of nodes
+// before we start scaling the push/pull timing. The scale
+// effect is the log2(Nodes) - log2(pushPullScale). This means
+// that the 33rd node will cause us to double the interval,
+// while the 65th will triple it.
+const pushPullScaleThreshold = 32
+
+/*
+ * Contains an entry for each private block:
+ * 10.0.0.0/8
+ * 172.16.0.0/12
+ * 192.168/16
+ */
+var privateBlocks []*net.IPNet
+
+var loopbackBlock *net.IPNet
+
+const (
+	// Constant litWidth 2-8
+	lzwLitWidth = 8
+)
+
+func init() {
+	// Seed the random number generator
+	rand.Seed(time.Now().UnixNano())
+
+	// Add each private block
+	privateBlocks = make([]*net.IPNet, 3)
+	_, block, err := net.ParseCIDR("10.0.0.0/8")
+	if err != nil {
+		panic(fmt.Sprintf("Bad cidr. Got %v", err))
+	}
+	privateBlocks[0] = block
+
+	_, block, err = net.ParseCIDR("172.16.0.0/12")
+	if err != nil {
+		panic(fmt.Sprintf("Bad cidr. Got %v", err))
+	}
+	privateBlocks[1] = block
+
+	_, block, err = net.ParseCIDR("192.168.0.0/16")
+	if err != nil {
+		panic(fmt.Sprintf("Bad cidr. Got %v", err))
+	}
+	privateBlocks[2] = block
+
+	_, block, err = net.ParseCIDR("127.0.0.0/8")
+	if err != nil {
+		panic(fmt.Sprintf("Bad cidr. Got %v", err))
+	}
+	loopbackBlock = block
+}
+
+// Decode reverses the encode operation on a byte slice input
+func decode(buf []byte, out interface{}) error {
+	r := bytes.NewReader(buf)
+	hd := codec.MsgpackHandle{}
+	dec := codec.NewDecoder(r, &hd)
+	return dec.Decode(out)
+}
+
+// Encode writes an encoded object to a new bytes buffer
+func encode(msgType messageType, in interface{}) (*bytes.Buffer, error) {
+	buf := bytes.NewBuffer(nil)
+	buf.WriteByte(uint8(msgType))
+	hd := codec.MsgpackHandle{}
+	enc := codec.NewEncoder(buf, &hd)
+	err := enc.Encode(in)
+	return buf, err
+}
+
+// Returns a random offset between 0 and n
+func randomOffset(n int) int {
+	if n == 0 {
+		return 0
+	}
+	return int(rand.Uint32() % uint32(n))
+}
+
+// suspicionTimeout computes the timeout that should be used when
+// a node is suspected
+func suspicionTimeout(suspicionMult, n int, interval time.Duration) time.Duration {
+	nodeScale := math.Ceil(math.Log10(float64(n + 1)))
+	timeout := time.Duration(suspicionMult) * time.Duration(nodeScale) * interval
+	return timeout
+}
+
+// retransmitLimit computes the limit of retransmissions
+func retransmitLimit(retransmitMult, n int) int {
+	nodeScale := math.Ceil(math.Log10(float64(n + 1)))
+	limit := retransmitMult * int(nodeScale)
+	return limit
+}
+
+// shuffleNodes randomly shuffles the input nodes
+func shuffleNodes(nodes []*nodeState) {
+	for i := range nodes {
+		j := rand.Intn(i + 1)
+		nodes[i], nodes[j] = nodes[j], nodes[i]
+	}
+}
+
+// pushPushScale is used to scale the time interval at which push/pull
+// syncs take place. It is used to prevent network saturation as the
+// cluster size grows
+func pushPullScale(interval time.Duration, n int) time.Duration {
+	// Don't scale until we cross the threshold
+	if n <= pushPullScaleThreshold {
+		return interval
+	}
+
+	multiplier := math.Ceil(math.Log2(float64(n))-math.Log2(pushPullScaleThreshold)) + 1.0
+	return time.Duration(multiplier) * interval
+}
+
+// moveDeadNodes moves all the nodes in the dead state
+// to the end of the slice and returns the index of the first dead node.
+func moveDeadNodes(nodes []*nodeState) int {
+	numDead := 0
+	n := len(nodes)
+	for i := 0; i < n-numDead; i++ {
+		if nodes[i].State != stateDead {
+			continue
+		}
+
+		// Move this node to the end
+		nodes[i], nodes[n-numDead-1] = nodes[n-numDead-1], nodes[i]
+		numDead++
+		i--
+	}
+	return n - numDead
+}
+
+// kRandomNodes is used to select up to k random nodes, excluding a given
+// node and any non-alive nodes. It is possible that less than k nodes are returned.
+func kRandomNodes(k int, excludes []string, nodes []*nodeState) []*nodeState {
+	n := len(nodes)
+	kNodes := make([]*nodeState, 0, k)
+OUTER:
+	// Probe up to 3*n times, with large n this is not necessary
+	// since k << n, but with small n we want search to be
+	// exhaustive
+	for i := 0; i < 3*n && len(kNodes) < k; i++ {
+		// Get random node
+		idx := randomOffset(n)
+		node := nodes[idx]
+
+		// Exclude node if match
+		for _, exclude := range excludes {
+			if node.Name == exclude {
+				continue OUTER
+			}
+		}
+
+		// Exclude if not alive
+		if node.State != stateAlive {
+			continue
+		}
+
+		// Check if we have this node already
+		for j := 0; j < len(kNodes); j++ {
+			if node == kNodes[j] {
+				continue OUTER
+			}
+		}
+
+		// Append the node
+		kNodes = append(kNodes, node)
+	}
+	return kNodes
+}
+
+// makeCompoundMessage takes a list of messages and generates
+// a single compound message containing all of them
+func makeCompoundMessage(msgs [][]byte) *bytes.Buffer {
+	// Create a local buffer
+	buf := bytes.NewBuffer(nil)
+
+	// Write out the type
+	buf.WriteByte(uint8(compoundMsg))
+
+	// Write out the number of message
+	buf.WriteByte(uint8(len(msgs)))
+
+	// Add the message lengths
+	for _, m := range msgs {
+		binary.Write(buf, binary.BigEndian, uint16(len(m)))
+	}
+
+	// Append the messages
+	for _, m := range msgs {
+		buf.Write(m)
+	}
+
+	return buf
+}
+
+// decodeCompoundMessage splits a compound message and returns
+// the slices of individual messages. Also returns the number
+// of truncated messages and any potential error
+func decodeCompoundMessage(buf []byte) (trunc int, parts [][]byte, err error) {
+	if len(buf) < 1 {
+		err = fmt.Errorf("missing compound length byte")
+		return
+	}
+	numParts := uint8(buf[0])
+	buf = buf[1:]
+
+	// Check we have enough bytes
+	if len(buf) < int(numParts*2) {
+		err = fmt.Errorf("truncated len slice")
+		return
+	}
+
+	// Decode the lengths
+	lengths := make([]uint16, numParts)
+	for i := 0; i < int(numParts); i++ {
+		lengths[i] = binary.BigEndian.Uint16(buf[i*2 : i*2+2])
+	}
+	buf = buf[numParts*2:]
+
+	// Split each message
+	for idx, msgLen := range lengths {
+		if len(buf) < int(msgLen) {
+			trunc = int(numParts) - idx
+			return
+		}
+
+		// Extract the slice, seek past on the buffer
+		slice := buf[:msgLen]
+		buf = buf[msgLen:]
+		parts = append(parts, slice)
+	}
+	return
+}
+
+// Returns if the given IP is in a private block
+func isPrivateIP(ip_str string) bool {
+	ip := net.ParseIP(ip_str)
+	for _, priv := range privateBlocks {
+		if priv.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}
+
+// Returns if the given IP is in a loopback block
+func isLoopbackIP(ip_str string) bool {
+	ip := net.ParseIP(ip_str)
+	return loopbackBlock.Contains(ip)
+}
+
+// compressPayload takes an opaque input buffer, compresses it
+// and wraps it in a compress{} message that is encoded.
+func compressPayload(inp []byte) (*bytes.Buffer, error) {
+	var buf bytes.Buffer
+	compressor := lzw.NewWriter(&buf, lzw.LSB, lzwLitWidth)
+
+	_, err := compressor.Write(inp)
+	if err != nil {
+		return nil, err
+	}
+
+	// Ensure we flush everything out
+	if err := compressor.Close(); err != nil {
+		return nil, err
+	}
+
+	// Create a compressed message
+	c := compress{
+		Algo: lzwAlgo,
+		Buf:  buf.Bytes(),
+	}
+	return encode(compressMsg, &c)
+}
+
+// decompressPayload is used to unpack an encoded compress{}
+// message and return its payload uncompressed
+func decompressPayload(msg []byte) ([]byte, error) {
+	// Decode the message
+	var c compress
+	if err := decode(msg, &c); err != nil {
+		return nil, err
+	}
+	return decompressBuffer(&c)
+}
+
+// decompressBuffer is used to decompress the buffer of
+// a single compress message, handling multiple algorithms
+func decompressBuffer(c *compress) ([]byte, error) {
+	// Verify the algorithm
+	if c.Algo != lzwAlgo {
+		return nil, fmt.Errorf("Cannot decompress unknown algorithm %d", c.Algo)
+	}
+
+	// Create a uncompressor
+	uncomp := lzw.NewReader(bytes.NewReader(c.Buf), lzw.LSB, lzwLitWidth)
+	defer uncomp.Close()
+
+	// Read all the data
+	var b bytes.Buffer
+	_, err := io.Copy(&b, uncomp)
+	if err != nil {
+		return nil, err
+	}
+
+	// Return the uncompressed bytes
+	return b.Bytes(), nil
+}

vendor/src/github.com/hashicorp/serf/serf/broadcast.go

@@ -0,0 +1,27 @@
+package serf
+
+import (
+	"github.com/hashicorp/memberlist"
+)
+
+// broadcast is an implementation of memberlist.Broadcast and is used
+// to manage broadcasts across the memberlist channel that are related
+// only to Serf.
+type broadcast struct {
+	msg    []byte
+	notify chan<- struct{}
+}
+
+func (b *broadcast) Invalidates(other memberlist.Broadcast) bool {
+	return false
+}
+
+func (b *broadcast) Message() []byte {
+	return b.msg
+}
+
+func (b *broadcast) Finished() {
+	if b.notify != nil {
+		close(b.notify)
+	}
+}

vendor/src/github.com/hashicorp/serf/serf/coalesce.go

@@ -0,0 +1,80 @@
+package serf
+
+import (
+	"time"
+)
+
+// coalescer is a simple interface that must be implemented to be
+// used inside of a coalesceLoop
+type coalescer interface {
+	// Can the coalescer handle this event, if not it is
+	// directly passed through to the destination channel
+	Handle(Event) bool
+
+	// Invoked to coalesce the given event
+	Coalesce(Event)
+
+	// Invoked to flush the coalesced events
+	Flush(outChan chan<- Event)
+}
+
+// coalescedEventCh returns an event channel where the events are coalesced
+// using the given coalescer.
+func coalescedEventCh(outCh chan<- Event, shutdownCh <-chan struct{},
+	cPeriod time.Duration, qPeriod time.Duration, c coalescer) chan<- Event {
+	inCh := make(chan Event, 1024)
+	go coalesceLoop(inCh, outCh, shutdownCh, cPeriod, qPeriod, c)
+	return inCh
+}
+
+// coalesceLoop is a simple long-running routine that manages the high-level
+// flow of coalescing based on quiescence and a maximum quantum period.
+func coalesceLoop(inCh <-chan Event, outCh chan<- Event, shutdownCh <-chan struct{},
+	coalescePeriod time.Duration, quiescentPeriod time.Duration, c coalescer) {
+	var quiescent <-chan time.Time
+	var quantum <-chan time.Time
+	shutdown := false
+
+INGEST:
+	// Reset the timers
+	quantum = nil
+	quiescent = nil
+
+	for {
+		select {
+		case e := <-inCh:
+			// Ignore any non handled events
+			if !c.Handle(e) {
+				outCh <- e
+				continue
+			}
+
+			// Start a new quantum if we need to
+			// and restart the quiescent timer
+			if quantum == nil {
+				quantum = time.After(coalescePeriod)
+			}
+			quiescent = time.After(quiescentPeriod)
+
+			// Coalesce the event
+			c.Coalesce(e)
+
+		case <-quantum:
+			goto FLUSH
+		case <-quiescent:
+			goto FLUSH
+		case <-shutdownCh:
+			shutdown = true
+			goto FLUSH
+		}
+	}
+
+FLUSH:
+	// Flush the coalesced events
+	c.Flush(outCh)
+
+	// Restart ingestion if we are not done
+	if !shutdown {
+		goto INGEST
+	}
+}

vendor/src/github.com/hashicorp/serf/serf/coalesce_member.go

@@ -0,0 +1,68 @@
+package serf
+
+type coalesceEvent struct {
+	Type   EventType
+	Member *Member
+}
+
+type memberEventCoalescer struct {
+	lastEvents   map[string]EventType
+	latestEvents map[string]coalesceEvent
+}
+
+func (c *memberEventCoalescer) Handle(e Event) bool {
+	switch e.EventType() {
+	case EventMemberJoin:
+		return true
+	case EventMemberLeave:
+		return true
+	case EventMemberFailed:
+		return true
+	case EventMemberUpdate:
+		return true
+	case EventMemberReap:
+		return true
+	default:
+		return false
+	}
+}
+
+func (c *memberEventCoalescer) Coalesce(raw Event) {
+	e := raw.(MemberEvent)
+	for _, m := range e.Members {
+		c.latestEvents[m.Name] = coalesceEvent{
+			Type:   e.Type,
+			Member: &m,
+		}
+	}
+}
+
+func (c *memberEventCoalescer) Flush(outCh chan<- Event) {
+	// Coalesce the various events we got into a single set of events.
+	events := make(map[EventType]*MemberEvent)
+	for name, cevent := range c.latestEvents {
+		previous, ok := c.lastEvents[name]
+
+		// If we sent the same event before, then ignore
+		// unless it is a MemberUpdate
+		if ok && previous == cevent.Type && cevent.Type != EventMemberUpdate {
+			continue
+		}
+
+		// Update our last event
+		c.lastEvents[name] = cevent.Type
+
+		// Add it to our event
+		newEvent, ok := events[cevent.Type]
+		if !ok {
+			newEvent = &MemberEvent{Type: cevent.Type}
+			events[cevent.Type] = newEvent
+		}
+		newEvent.Members = append(newEvent.Members, *cevent.Member)
+	}
+
+	// Send out those events
+	for _, event := range events {
+		outCh <- *event
+	}
+}

vendor/src/github.com/hashicorp/serf/serf/coalesce_user.go

@@ -0,0 +1,52 @@
+package serf
+
+type latestUserEvents struct {
+	LTime  LamportTime
+	Events []Event
+}
+
+type userEventCoalescer struct {
+	// Maps an event name into the latest versions
+	events map[string]*latestUserEvents
+}
+
+func (c *userEventCoalescer) Handle(e Event) bool {
+	// Only handle EventUser messages
+	if e.EventType() != EventUser {
+		return false
+	}
+
+	// Check if coalescing is enabled
+	user := e.(UserEvent)
+	return user.Coalesce
+}
+
+func (c *userEventCoalescer) Coalesce(e Event) {
+	user := e.(UserEvent)
+	latest, ok := c.events[user.Name]
+
+	// Create a new entry if there are none, or
+	// if this message has the newest LTime
+	if !ok || latest.LTime < user.LTime {
+		latest = &latestUserEvents{
+			LTime:  user.LTime,
+			Events: []Event{e},
+		}
+		c.events[user.Name] = latest
+		return
+	}
+
+	// If the the same age, save it
+	if latest.LTime == user.LTime {
+		latest.Events = append(latest.Events, e)
+	}
+}
+
+func (c *userEventCoalescer) Flush(outChan chan<- Event) {
+	for _, latest := range c.events {
+		for _, e := range latest.Events {
+			outChan <- e
+		}
+	}
+	c.events = make(map[string]*latestUserEvents)
+}

vendor/src/github.com/hashicorp/serf/serf/config.go

@@ -0,0 +1,234 @@
+package serf
+
+import (
+	"io"
+	"os"
+	"time"
+
+	"github.com/hashicorp/memberlist"
+)
+
+// ProtocolVersionMap is the mapping of Serf delegate protocol versions
+// to memberlist protocol versions. We mask the memberlist protocols using
+// our own protocol version.
+var ProtocolVersionMap map[uint8]uint8
+
+func init() {
+	ProtocolVersionMap = map[uint8]uint8{
+		4: 2,
+		3: 2,
+		2: 2,
+	}
+}
+
+// Config is the configuration for creating a Serf instance.
+type Config struct {
+	// The name of this node. This must be unique in the cluster. If this
+	// is not set, Serf will set it to the hostname of the running machine.
+	NodeName string
+
+	// The tags for this role, if any. This is used to provide arbitrary
+	// key/value metadata per-node. For example, a "role" tag may be used to
+	// differentiate "load-balancer" from a "web" role as parts of the same cluster.
+	// Tags are deprecating 'Role', and instead it acts as a special key in this
+	// map.
+	Tags map[string]string
+
+	// EventCh is a channel that receives all the Serf events. The events
+	// are sent on this channel in proper ordering. Care must be taken that
+	// this channel doesn't block, either by processing the events quick
+	// enough or buffering the channel, otherwise it can block state updates
+	// within Serf itself. If no EventCh is specified, no events will be fired,
+	// but point-in-time snapshots of members can still be retrieved by
+	// calling Members on Serf.
+	EventCh chan<- Event
+
+	// ProtocolVersion is the protocol version to speak. This must be between
+	// ProtocolVersionMin and ProtocolVersionMax.
+	ProtocolVersion uint8
+
+	// BroadcastTimeout is the amount of time to wait for a broadcast
+	// message to be sent to the cluster. Broadcast messages are used for
+	// things like leave messages and force remove messages. If this is not
+	// set, a timeout of 5 seconds will be set.
+	BroadcastTimeout time.Duration
+
+	// The settings below relate to Serf's event coalescence feature. Serf
+	// is able to coalesce multiple events into single events in order to
+	// reduce the amount of noise that is sent along the EventCh. For example
+	// if five nodes quickly join, the EventCh will be sent one EventMemberJoin
+	// containing the five nodes rather than five individual EventMemberJoin
+	// events. Coalescence can mitigate potential flapping behavior.
+	//
+	// Coalescence is disabled by default and can be enabled by setting
+	// CoalescePeriod.
+	//
+	// CoalescePeriod specifies the time duration to coalesce events.
+	// For example, if this is set to 5 seconds, then all events received
+	// within 5 seconds that can be coalesced will be.
+	//
+	// QuiescentPeriod specifies the duration of time where if no events
+	// are received, coalescence immediately happens. For example, if
+	// CoalscePeriod is set to 10 seconds but QuiscentPeriod is set to 2
+	// seconds, then the events will be coalesced and dispatched if no
+	// new events are received within 2 seconds of the last event. Otherwise,
+	// every event will always be delayed by at least 10 seconds.
+	CoalescePeriod  time.Duration
+	QuiescentPeriod time.Duration
+
+	// The settings below relate to Serf's user event coalescing feature.
+	// The settings operate like above but only affect user messages and
+	// not the Member* messages that Serf generates.
+	UserCoalescePeriod  time.Duration
+	UserQuiescentPeriod time.Duration
+
+	// The settings below relate to Serf keeping track of recently
+	// failed/left nodes and attempting reconnects.
+	//
+	// ReapInterval is the interval when the reaper runs. If this is not
+	// set (it is zero), it will be set to a reasonable default.
+	//
+	// ReconnectInterval is the interval when we attempt to reconnect
+	// to failed nodes. If this is not set (it is zero), it will be set
+	// to a reasonable default.
+	//
+	// ReconnectTimeout is the amount of time to attempt to reconnect to
+	// a failed node before giving up and considering it completely gone.
+	//
+	// TombstoneTimeout is the amount of time to keep around nodes
+	// that gracefully left as tombstones for syncing state with other
+	// Serf nodes.
+	ReapInterval      time.Duration
+	ReconnectInterval time.Duration
+	ReconnectTimeout  time.Duration
+	TombstoneTimeout  time.Duration
+
+	// QueueDepthWarning is used to generate warning message if the
+	// number of queued messages to broadcast exceeds this number. This
+	// is to provide the user feedback if events are being triggered
+	// faster than they can be disseminated
+	QueueDepthWarning int
+
+	// MaxQueueDepth is used to start dropping messages if the number
+	// of queued messages to broadcast exceeds this number. This is to
+	// prevent an unbounded growth of memory utilization
+	MaxQueueDepth int
+
+	// RecentIntentBuffer is used to set the size of recent join and leave intent
+	// messages that will be buffered. This is used to guard against
+	// the case where Serf broadcasts an intent that arrives before the
+	// Memberlist event. It is important that this not be too small to avoid
+	// continuous rebroadcasting of dead events.
+	RecentIntentBuffer int
+
+	// EventBuffer is used to control how many events are buffered.
+	// This is used to prevent re-delivery of events to a client. The buffer
+	// must be large enough to handle all "recent" events, since Serf will
+	// not deliver messages that are older than the oldest entry in the buffer.
+	// Thus if a client is generating too many events, it's possible that the
+	// buffer gets overrun and messages are not delivered.
+	EventBuffer int
+
+	// QueryBuffer is used to control how many queries are buffered.
+	// This is used to prevent re-delivery of queries to a client. The buffer
+	// must be large enough to handle all "recent" events, since Serf will not
+	// deliver queries older than the oldest entry in the buffer.
+	// Thus if a client is generating too many queries, it's possible that the
+	// buffer gets overrun and messages are not delivered.
+	QueryBuffer int
+
+	// QueryTimeoutMult configures the default timeout multipler for a query to run if no
+	// specific value is provided. Queries are real-time by nature, where the
+	// reply is time sensitive. As a result, results are collected in an async
+	// fashion, however the query must have a bounded duration. We want the timeout
+	// to be long enough that all nodes have time to receive the message, run a handler,
+	// and generate a reply. Once the timeout is exceeded, any further replies are ignored.
+	// The default value is
+	//
+	// Timeout = GossipInterval * QueryTimeoutMult * log(N+1)
+	//
+	QueryTimeoutMult int
+
+	// MemberlistConfig is the memberlist configuration that Serf will
+	// use to do the underlying membership management and gossip. Some
+	// fields in the MemberlistConfig will be overwritten by Serf no
+	// matter what:
+	//
+	//   * Name - This will always be set to the same as the NodeName
+	//     in this configuration.
+	//
+	//   * Events - Serf uses a custom event delegate.
+	//
+	//   * Delegate - Serf uses a custom delegate.
+	//
+	MemberlistConfig *memberlist.Config
+
+	// LogOutput is the location to write logs to. If this is not set,
+	// logs will go to stderr.
+	LogOutput io.Writer
+
+	// SnapshotPath if provided is used to snapshot live nodes as well
+	// as lamport clock values. When Serf is started with a snapshot,
+	// it will attempt to join all the previously known nodes until one
+	// succeeds and will also avoid replaying old user events.
+	SnapshotPath string
+
+	// RejoinAfterLeave controls our interaction with the snapshot file.
+	// When set to false (default), a leave causes a Serf to not rejoin
+	// the cluster until an explicit join is received. If this is set to
+	// true, we ignore the leave, and rejoin the cluster on start.
+	RejoinAfterLeave bool
+
+	// EnableNameConflictResolution controls if Serf will actively attempt
+	// to resolve a name conflict. Since each Serf member must have a unique
+	// name, a cluster can run into issues if multiple nodes claim the same
+	// name. Without automatic resolution, Serf merely logs some warnings, but
+	// otherwise does not take any action. Automatic resolution detects the
+	// conflict and issues a special query which asks the cluster for the
+	// Name -> IP:Port mapping. If there is a simple majority of votes, that
+	// node stays while the other node will leave the cluster and exit.
+	EnableNameConflictResolution bool
+
+	// KeyringFile provides the location of a writable file where Serf can
+	// persist changes to the encryption keyring.
+	KeyringFile string
+
+	// Merge can be optionally provided to intercept a cluster merge
+	// and conditionally abort the merge.
+	Merge MergeDelegate
+}
+
+// Init allocates the subdata structures
+func (c *Config) Init() {
+	if c.Tags == nil {
+		c.Tags = make(map[string]string)
+	}
+}
+
+// DefaultConfig returns a Config struct that contains reasonable defaults
+// for most of the configurations.
+func DefaultConfig() *Config {
+	hostname, err := os.Hostname()
+	if err != nil {
+		panic(err)
+	}
+
+	return &Config{
+		NodeName:                     hostname,
+		BroadcastTimeout:             5 * time.Second,
+		EventBuffer:                  512,
+		QueryBuffer:                  512,
+		LogOutput:                    os.Stderr,
+		ProtocolVersion:              ProtocolVersionMax,
+		ReapInterval:                 15 * time.Second,
+		RecentIntentBuffer:           128,
+		ReconnectInterval:            30 * time.Second,
+		ReconnectTimeout:             24 * time.Hour,
+		QueueDepthWarning:            128,
+		MaxQueueDepth:                4096,
+		TombstoneTimeout:             24 * time.Hour,
+		MemberlistConfig:             memberlist.DefaultLANConfig(),
+		QueryTimeoutMult:             16,
+		EnableNameConflictResolution: true,
+	}
+}

vendor/src/github.com/hashicorp/serf/serf/conflict_delegate.go

@@ -0,0 +1,13 @@
+package serf
+
+import (
+	"github.com/hashicorp/memberlist"
+)
+
+type conflictDelegate struct {
+	serf *Serf
+}
+
+func (c *conflictDelegate) NotifyConflict(existing, other *memberlist.Node) {
+	c.serf.handleNodeConflict(existing, other)
+}

vendor/src/github.com/hashicorp/serf/serf/delegate.go

@@ -0,0 +1,247 @@
+package serf
+
+import (
+	"fmt"
+	"github.com/armon/go-metrics"
+)
+
+// delegate is the memberlist.Delegate implementation that Serf uses.
+type delegate struct {
+	serf *Serf
+}
+
+func (d *delegate) NodeMeta(limit int) []byte {
+	roleBytes := d.serf.encodeTags(d.serf.config.Tags)
+	if len(roleBytes) > limit {
+		panic(fmt.Errorf("Node tags '%v' exceeds length limit of %d bytes", d.serf.config.Tags, limit))
+	}
+
+	return roleBytes
+}
+
+func (d *delegate) NotifyMsg(buf []byte) {
+	// If we didn't actually receive any data, then ignore it.
+	if len(buf) == 0 {
+		return
+	}
+	metrics.AddSample([]string{"serf", "msgs", "received"}, float32(len(buf)))
+
+	rebroadcast := false
+	rebroadcastQueue := d.serf.broadcasts
+	t := messageType(buf[0])
+	switch t {
+	case messageLeaveType:
+		var leave messageLeave
+		if err := decodeMessage(buf[1:], &leave); err != nil {
+			d.serf.logger.Printf("[ERR] serf: Error decoding leave message: %s", err)
+			break
+		}
+
+		d.serf.logger.Printf("[DEBUG] serf: messageLeaveType: %s", leave.Node)
+		rebroadcast = d.serf.handleNodeLeaveIntent(&leave)
+
+	case messageJoinType:
+		var join messageJoin
+		if err := decodeMessage(buf[1:], &join); err != nil {
+			d.serf.logger.Printf("[ERR] serf: Error decoding join message: %s", err)
+			break
+		}
+
+		d.serf.logger.Printf("[DEBUG] serf: messageJoinType: %s", join.Node)
+		rebroadcast = d.serf.handleNodeJoinIntent(&join)
+
+	case messageUserEventType:
+		var event messageUserEvent
+		if err := decodeMessage(buf[1:], &event); err != nil {
+			d.serf.logger.Printf("[ERR] serf: Error decoding user event message: %s", err)
+			break
+		}
+
+		d.serf.logger.Printf("[DEBUG] serf: messageUserEventType: %s", event.Name)
+		rebroadcast = d.serf.handleUserEvent(&event)
+		rebroadcastQueue = d.serf.eventBroadcasts
+
+	case messageQueryType:
+		var query messageQuery
+		if err := decodeMessage(buf[1:], &query); err != nil {
+			d.serf.logger.Printf("[ERR] serf: Error decoding query message: %s", err)
+			break
+		}
+
+		d.serf.logger.Printf("[DEBUG] serf: messageQueryType: %s", query.Name)
+		rebroadcast = d.serf.handleQuery(&query)
+		rebroadcastQueue = d.serf.queryBroadcasts
+
+	case messageQueryResponseType:
+		var resp messageQueryResponse
+		if err := decodeMessage(buf[1:], &resp); err != nil {
+			d.serf.logger.Printf("[ERR] serf: Error decoding query response message: %s", err)
+			break
+		}
+
+		d.serf.logger.Printf("[DEBUG] serf: messageQueryResponseType: %v", resp.From)
+		d.serf.handleQueryResponse(&resp)
+
+	default:
+		d.serf.logger.Printf("[WARN] serf: Received message of unknown type: %d", t)
+	}
+
+	if rebroadcast {
+		// Copy the buffer since it we cannot rely on the slice not changing
+		newBuf := make([]byte, len(buf))
+		copy(newBuf, buf)
+
+		rebroadcastQueue.QueueBroadcast(&broadcast{
+			msg:    newBuf,
+			notify: nil,
+		})
+	}
+}
+
+func (d *delegate) GetBroadcasts(overhead, limit int) [][]byte {
+	msgs := d.serf.broadcasts.GetBroadcasts(overhead, limit)
+
+	// Determine the bytes used already
+	bytesUsed := 0
+	for _, msg := range msgs {
+		lm := len(msg)
+		bytesUsed += lm + overhead
+		metrics.AddSample([]string{"serf", "msgs", "sent"}, float32(lm))
+	}
+
+	// Get any additional query broadcasts
+	queryMsgs := d.serf.queryBroadcasts.GetBroadcasts(overhead, limit-bytesUsed)
+	if queryMsgs != nil {
+		for _, m := range queryMsgs {
+			lm := len(m)
+			bytesUsed += lm + overhead
+			metrics.AddSample([]string{"serf", "msgs", "sent"}, float32(lm))
+		}
+		msgs = append(msgs, queryMsgs...)
+	}
+
+	// Get any additional event broadcasts
+	eventMsgs := d.serf.eventBroadcasts.GetBroadcasts(overhead, limit-bytesUsed)
+	if eventMsgs != nil {
+		for _, m := range eventMsgs {
+			lm := len(m)
+			bytesUsed += lm + overhead
+			metrics.AddSample([]string{"serf", "msgs", "sent"}, float32(lm))
+		}
+		msgs = append(msgs, eventMsgs...)
+	}
+
+	return msgs
+}
+
+func (d *delegate) LocalState(join bool) []byte {
+	d.serf.memberLock.RLock()
+	defer d.serf.memberLock.RUnlock()
+	d.serf.eventLock.RLock()
+	defer d.serf.eventLock.RUnlock()
+
+	// Create the message to send
+	pp := messagePushPull{
+		LTime:        d.serf.clock.Time(),
+		StatusLTimes: make(map[string]LamportTime, len(d.serf.members)),
+		LeftMembers:  make([]string, 0, len(d.serf.leftMembers)),
+		EventLTime:   d.serf.eventClock.Time(),
+		Events:       d.serf.eventBuffer,
+		QueryLTime:   d.serf.queryClock.Time(),
+	}
+
+	// Add all the join LTimes
+	for name, member := range d.serf.members {
+		pp.StatusLTimes[name] = member.statusLTime
+	}
+
+	// Add all the left nodes
+	for _, member := range d.serf.leftMembers {
+		pp.LeftMembers = append(pp.LeftMembers, member.Name)
+	}
+
+	// Encode the push pull state
+	buf, err := encodeMessage(messagePushPullType, &pp)
+	if err != nil {
+		d.serf.logger.Printf("[ERR] serf: Failed to encode local state: %v", err)
+		return nil
+	}
+	return buf
+}
+
+func (d *delegate) MergeRemoteState(buf []byte, isJoin bool) {
+	// Check the message type
+	if messageType(buf[0]) != messagePushPullType {
+		d.serf.logger.Printf("[ERR] serf: Remote state has bad type prefix: %v", buf[0])
+		return
+	}
+
+	// Attempt a decode
+	pp := messagePushPull{}
+	if err := decodeMessage(buf[1:], &pp); err != nil {
+		d.serf.logger.Printf("[ERR] serf: Failed to decode remote state: %v", err)
+		return
+	}
+
+	// Witness the Lamport clocks first.
+	// We subtract 1 since no message with that clock has been sent yet
+	if pp.LTime > 0 {
+		d.serf.clock.Witness(pp.LTime - 1)
+	}
+	if pp.EventLTime > 0 {
+		d.serf.eventClock.Witness(pp.EventLTime - 1)
+	}
+	if pp.QueryLTime > 0 {
+		d.serf.queryClock.Witness(pp.QueryLTime - 1)
+	}
+
+	// Process the left nodes first to avoid the LTimes from being increment
+	// in the wrong order
+	leftMap := make(map[string]struct{}, len(pp.LeftMembers))
+	leave := messageLeave{}
+	for _, name := range pp.LeftMembers {
+		leftMap[name] = struct{}{}
+		leave.LTime = pp.StatusLTimes[name]
+		leave.Node = name
+		d.serf.handleNodeLeaveIntent(&leave)
+	}
+
+	// Update any other LTimes
+	join := messageJoin{}
+	for name, statusLTime := range pp.StatusLTimes {
+		// Skip the left nodes
+		if _, ok := leftMap[name]; ok {
+			continue
+		}
+
+		// Create an artificial join message
+		join.LTime = statusLTime
+		join.Node = name
+		d.serf.handleNodeJoinIntent(&join)
+	}
+
+	// If we are doing a join, and eventJoinIgnore is set
+	// then we set the eventMinTime to the EventLTime. This
+	// prevents any of the incoming events from being processed
+	if isJoin && d.serf.eventJoinIgnore {
+		d.serf.eventLock.Lock()
+		if pp.EventLTime > d.serf.eventMinTime {
+			d.serf.eventMinTime = pp.EventLTime
+		}
+		d.serf.eventLock.Unlock()
+	}
+
+	// Process all the events
+	userEvent := messageUserEvent{}
+	for _, events := range pp.Events {
+		if events == nil {
+			continue
+		}
+		userEvent.LTime = events.LTime
+		for _, e := range events.Events {
+			userEvent.Name = e.Name
+			userEvent.Payload = e.Payload
+			d.serf.handleUserEvent(&userEvent)
+		}
+	}
+}

vendor/src/github.com/hashicorp/serf/serf/event.go

@@ -0,0 +1,168 @@
+package serf
+
+import (
+	"fmt"
+	"net"
+	"sync"
+	"time"
+)
+
+// EventType are all the types of events that may occur and be sent
+// along the Serf channel.
+type EventType int
+
+const (
+	EventMemberJoin EventType = iota
+	EventMemberLeave
+	EventMemberFailed
+	EventMemberUpdate
+	EventMemberReap
+	EventUser
+	EventQuery
+)
+
+func (t EventType) String() string {
+	switch t {
+	case EventMemberJoin:
+		return "member-join"
+	case EventMemberLeave:
+		return "member-leave"
+	case EventMemberFailed:
+		return "member-failed"
+	case EventMemberUpdate:
+		return "member-update"
+	case EventMemberReap:
+		return "member-reap"
+	case EventUser:
+		return "user"
+	case EventQuery:
+		return "query"
+	default:
+		panic(fmt.Sprintf("unknown event type: %d", t))
+	}
+}
+
+// Event is a generic interface for exposing Serf events
+// Clients will usually need to use a type switches to get
+// to a more useful type
+type Event interface {
+	EventType() EventType
+	String() string
+}
+
+// MemberEvent is the struct used for member related events
+// Because Serf coalesces events, an event may contain multiple members.
+type MemberEvent struct {
+	Type    EventType
+	Members []Member
+}
+
+func (m MemberEvent) EventType() EventType {
+	return m.Type
+}
+
+func (m MemberEvent) String() string {
+	switch m.Type {
+	case EventMemberJoin:
+		return "member-join"
+	case EventMemberLeave:
+		return "member-leave"
+	case EventMemberFailed:
+		return "member-failed"
+	case EventMemberUpdate:
+		return "member-update"
+	case EventMemberReap:
+		return "member-reap"
+	default:
+		panic(fmt.Sprintf("unknown event type: %d", m.Type))
+	}
+}
+
+// UserEvent is the struct used for events that are triggered
+// by the user and are not related to members
+type UserEvent struct {
+	LTime    LamportTime
+	Name     string
+	Payload  []byte
+	Coalesce bool
+}
+
+func (u UserEvent) EventType() EventType {
+	return EventUser
+}
+
+func (u UserEvent) String() string {
+	return fmt.Sprintf("user-event: %s", u.Name)
+}
+
+// Query is the struct used EventQuery type events
+type Query struct {
+	LTime   LamportTime
+	Name    string
+	Payload []byte
+
+	serf     *Serf
+	id       uint32    // ID is not exported, since it may change
+	addr     []byte    // Address to respond to
+	port     uint16    // Port to respond to
+	deadline time.Time // Must respond by this deadline
+	respLock sync.Mutex
+}
+
+func (q *Query) EventType() EventType {
+	return EventQuery
+}
+
+func (q *Query) String() string {
+	return fmt.Sprintf("query: %s", q.Name)
+}
+
+// Deadline returns the time by which a response must be sent
+func (q *Query) Deadline() time.Time {
+	return q.deadline
+}
+
+// Respond is used to send a response to the user query
+func (q *Query) Respond(buf []byte) error {
+	q.respLock.Lock()
+	defer q.respLock.Unlock()
+
+	// Check if we've already responded
+	if q.deadline.IsZero() {
+		return fmt.Errorf("Response already sent")
+	}
+
+	// Ensure we aren't past our response deadline
+	if time.Now().After(q.deadline) {
+		return fmt.Errorf("Response is past the deadline")
+	}
+
+	// Create response
+	resp := messageQueryResponse{
+		LTime:   q.LTime,
+		ID:      q.id,
+		From:    q.serf.config.NodeName,
+		Payload: buf,
+	}
+
+	// Format the response
+	raw, err := encodeMessage(messageQueryResponseType, &resp)
+	if err != nil {
+		return fmt.Errorf("Failed to format response: %v", err)
+	}
+
+	// Check the size limit
+	if len(raw) > QueryResponseSizeLimit {
+		return fmt.Errorf("response exceeds limit of %d bytes", QueryResponseSizeLimit)
+	}
+
+	// Send the response
+	addr := net.UDPAddr{IP: q.addr, Port: int(q.port)}
+	if err := q.serf.memberlist.SendTo(&addr, raw); err != nil {
+		return err
+	}
+
+	// Clera the deadline, response sent
+	q.deadline = time.Time{}
+	return nil
+}

vendor/src/github.com/hashicorp/serf/serf/event_delegate.go

@@ -0,0 +1,21 @@
+package serf
+
+import (
+	"github.com/hashicorp/memberlist"
+)
+
+type eventDelegate struct {
+	serf *Serf
+}
+
+func (e *eventDelegate) NotifyJoin(n *memberlist.Node) {
+	e.serf.handleNodeJoin(n)
+}
+
+func (e *eventDelegate) NotifyLeave(n *memberlist.Node) {
+	e.serf.handleNodeLeave(n)
+}
+
+func (e *eventDelegate) NotifyUpdate(n *memberlist.Node) {
+	e.serf.handleNodeUpdate(n)
+}

vendor/src/github.com/hashicorp/serf/serf/internal_query.go

@@ -0,0 +1,312 @@
+package serf
+
+import (
+	"encoding/base64"
+	"log"
+	"strings"
+)
+
+const (
+	// This is the prefix we use for queries that are internal to Serf.
+	// They are handled internally, and not forwarded to a client.
+	InternalQueryPrefix = "_serf_"
+
+	// pingQuery is run to check for reachability
+	pingQuery = "ping"
+
+	// conflictQuery is run to resolve a name conflict
+	conflictQuery = "conflict"
+
+	// installKeyQuery is used to install a new key
+	installKeyQuery = "install-key"
+
+	// useKeyQuery is used to change the primary encryption key
+	useKeyQuery = "use-key"
+
+	// removeKeyQuery is used to remove a key from the keyring
+	removeKeyQuery = "remove-key"
+
+	// listKeysQuery is used to list all known keys in the cluster
+	listKeysQuery = "list-keys"
+)
+
+// internalQueryName is used to generate a query name for an internal query
+func internalQueryName(name string) string {
+	return InternalQueryPrefix + name
+}
+
+// serfQueries is used to listen for queries that start with
+// _serf and respond to them as appropriate.
+type serfQueries struct {
+	inCh       chan Event
+	logger     *log.Logger
+	outCh      chan<- Event
+	serf       *Serf
+	shutdownCh <-chan struct{}
+}
+
+// nodeKeyResponse is used to store the result from an individual node while
+// replying to key modification queries
+type nodeKeyResponse struct {
+	// Result indicates true/false if there were errors or not
+	Result bool
+
+	// Message contains error messages or other information
+	Message string
+
+	// Keys is used in listing queries to relay a list of installed keys
+	Keys []string
+}
+
+// newSerfQueries is used to create a new serfQueries. We return an event
+// channel that is ingested and forwarded to an outCh. Any Queries that
+// have the InternalQueryPrefix are handled instead of forwarded.
+func newSerfQueries(serf *Serf, logger *log.Logger, outCh chan<- Event, shutdownCh <-chan struct{}) (chan<- Event, error) {
+	inCh := make(chan Event, 1024)
+	q := &serfQueries{
+		inCh:       inCh,
+		logger:     logger,
+		outCh:      outCh,
+		serf:       serf,
+		shutdownCh: shutdownCh,
+	}
+	go q.stream()
+	return inCh, nil
+}
+
+// stream is a long running routine to ingest the event stream
+func (s *serfQueries) stream() {
+	for {
+		select {
+		case e := <-s.inCh:
+			// Check if this is a query we should process
+			if q, ok := e.(*Query); ok && strings.HasPrefix(q.Name, InternalQueryPrefix) {
+				go s.handleQuery(q)
+
+			} else if s.outCh != nil {
+				s.outCh <- e
+			}
+
+		case <-s.shutdownCh:
+			return
+		}
+	}
+}
+
+// handleQuery is invoked when we get an internal query
+func (s *serfQueries) handleQuery(q *Query) {
+	// Get the queryName after the initial prefix
+	queryName := q.Name[len(InternalQueryPrefix):]
+	switch queryName {
+	case pingQuery:
+		// Nothing to do, we will ack the query
+	case conflictQuery:
+		s.handleConflict(q)
+	case installKeyQuery:
+		s.handleInstallKey(q)
+	case useKeyQuery:
+		s.handleUseKey(q)
+	case removeKeyQuery:
+		s.handleRemoveKey(q)
+	case listKeysQuery:
+		s.handleListKeys(q)
+	default:
+		s.logger.Printf("[WARN] serf: Unhandled internal query '%s'", queryName)
+	}
+}
+
+// handleConflict is invoked when we get a query that is attempting to
+// disambiguate a name conflict. They payload is a node name, and the response
+// should the address we believe that node is at, if any.
+func (s *serfQueries) handleConflict(q *Query) {
+	// The target node name is the payload
+	node := string(q.Payload)
+
+	// Do not respond to the query if it is about us
+	if node == s.serf.config.NodeName {
+		return
+	}
+	s.logger.Printf("[DEBUG] serf: Got conflict resolution query for '%s'", node)
+
+	// Look for the member info
+	var out *Member
+	s.serf.memberLock.Lock()
+	if member, ok := s.serf.members[node]; ok {
+		out = &member.Member
+	}
+	s.serf.memberLock.Unlock()
+
+	// Encode the response
+	buf, err := encodeMessage(messageConflictResponseType, out)
+	if err != nil {
+		s.logger.Printf("[ERR] serf: Failed to encode conflict query response: %v", err)
+		return
+	}
+
+	// Send our answer
+	if err := q.Respond(buf); err != nil {
+		s.logger.Printf("[ERR] serf: Failed to respond to conflict query: %v", err)
+	}
+}
+
+// sendKeyResponse handles responding to key-related queries.
+func (s *serfQueries) sendKeyResponse(q *Query, resp *nodeKeyResponse) {
+	buf, err := encodeMessage(messageKeyResponseType, resp)
+	if err != nil {
+		s.logger.Printf("[ERR] serf: Failed to encode key response: %v", err)
+		return
+	}
+
+	if err := q.Respond(buf); err != nil {
+		s.logger.Printf("[ERR] serf: Failed to respond to key query: %v", err)
+		return
+	}
+}
+
+// handleInstallKey is invoked whenever a new encryption key is received from
+// another member in the cluster, and handles the process of installing it onto
+// the memberlist keyring. This type of query may fail if the provided key does
+// not fit the constraints that memberlist enforces. If the query fails, the
+// response will contain the error message so that it may be relayed.
+func (s *serfQueries) handleInstallKey(q *Query) {
+	response := nodeKeyResponse{Result: false}
+	keyring := s.serf.config.MemberlistConfig.Keyring
+	req := keyRequest{}
+
+	err := decodeMessage(q.Payload[1:], &req)
+	if err != nil {
+		s.logger.Printf("[ERR] serf: Failed to decode key request: %v", err)
+		goto SEND
+	}
+
+	if !s.serf.EncryptionEnabled() {
+		response.Message = "No keyring to modify (encryption not enabled)"
+		s.logger.Printf("[ERR] serf: No keyring to modify (encryption not enabled)")
+		goto SEND
+	}
+
+	s.logger.Printf("[INFO] serf: Received install-key query")
+	if err := keyring.AddKey(req.Key); err != nil {
+		response.Message = err.Error()
+		s.logger.Printf("[ERR] serf: Failed to install key: %s", err)
+		goto SEND
+	}
+
+	if err := s.serf.writeKeyringFile(); err != nil {
+		response.Message = err.Error()
+		s.logger.Printf("[ERR] serf: Failed to write keyring file: %s", err)
+		goto SEND
+	}
+
+	response.Result = true
+
+SEND:
+	s.sendKeyResponse(q, &response)
+}
+
+// handleUseKey is invoked whenever a query is received to mark a different key
+// in the internal keyring as the primary key. This type of query may fail due
+// to operator error (requested key not in ring), and thus sends error messages
+// back in the response.
+func (s *serfQueries) handleUseKey(q *Query) {
+	response := nodeKeyResponse{Result: false}
+	keyring := s.serf.config.MemberlistConfig.Keyring
+	req := keyRequest{}
+
+	err := decodeMessage(q.Payload[1:], &req)
+	if err != nil {
+		s.logger.Printf("[ERR] serf: Failed to decode key request: %v", err)
+		goto SEND
+	}
+
+	if !s.serf.EncryptionEnabled() {
+		response.Message = "No keyring to modify (encryption not enabled)"
+		s.logger.Printf("[ERR] serf: No keyring to modify (encryption not enabled)")
+		goto SEND
+	}
+
+	s.logger.Printf("[INFO] serf: Received use-key query")
+	if err := keyring.UseKey(req.Key); err != nil {
+		response.Message = err.Error()
+		s.logger.Printf("[ERR] serf: Failed to change primary key: %s", err)
+		goto SEND
+	}
+
+	if err := s.serf.writeKeyringFile(); err != nil {
+		response.Message = err.Error()
+		s.logger.Printf("[ERR] serf: Failed to write keyring file: %s", err)
+		goto SEND
+	}
+
+	response.Result = true
+
+SEND:
+	s.sendKeyResponse(q, &response)
+}
+
+// handleRemoveKey is invoked when a query is received to remove a particular
+// key from the keyring. This type of query can fail if the key requested for
+// deletion is currently the primary key in the keyring, so therefore it will
+// reply to the query with any relevant errors from the operation.
+func (s *serfQueries) handleRemoveKey(q *Query) {
+	response := nodeKeyResponse{Result: false}
+	keyring := s.serf.config.MemberlistConfig.Keyring
+	req := keyRequest{}
+
+	err := decodeMessage(q.Payload[1:], &req)
+	if err != nil {
+		s.logger.Printf("[ERR] serf: Failed to decode key request: %v", err)
+		goto SEND
+	}
+
+	if !s.serf.EncryptionEnabled() {
+		response.Message = "No keyring to modify (encryption not enabled)"
+		s.logger.Printf("[ERR] serf: No keyring to modify (encryption not enabled)")
+		goto SEND
+	}
+
+	s.logger.Printf("[INFO] serf: Received remove-key query")
+	if err := keyring.RemoveKey(req.Key); err != nil {
+		response.Message = err.Error()
+		s.logger.Printf("[ERR] serf: Failed to remove key: %s", err)
+		goto SEND
+	}
+
+	if err := s.serf.writeKeyringFile(); err != nil {
+		response.Message = err.Error()
+		s.logger.Printf("[ERR] serf: Failed to write keyring file: %s", err)
+		goto SEND
+	}
+
+	response.Result = true
+
+SEND:
+	s.sendKeyResponse(q, &response)
+}
+
+// handleListKeys is invoked when a query is received to return a list of all
+// installed keys the Serf instance knows of. For performance, the keys are
+// encoded to base64 on each of the members to remove this burden from the
+// node asking for the results.
+func (s *serfQueries) handleListKeys(q *Query) {
+	response := nodeKeyResponse{Result: false}
+	keyring := s.serf.config.MemberlistConfig.Keyring
+
+	if !s.serf.EncryptionEnabled() {
+		response.Message = "Keyring is empty (encryption not enabled)"
+		s.logger.Printf("[ERR] serf: Keyring is empty (encryption not enabled)")
+		goto SEND
+	}
+
+	s.logger.Printf("[INFO] serf: Received list-keys query")
+	for _, keyBytes := range keyring.GetKeys() {
+		// Encode the keys before sending the response. This should help take
+		// some the burden of doing this off of the asking member.
+		key := base64.StdEncoding.EncodeToString(keyBytes)
+		response.Keys = append(response.Keys, key)
+	}
+	response.Result = true
+
+SEND:
+	s.sendKeyResponse(q, &response)
+}

vendor/src/github.com/hashicorp/serf/serf/keymanager.go

@@ -0,0 +1,166 @@
+package serf
+
+import (
+	"encoding/base64"
+	"fmt"
+	"sync"
+)
+
+// KeyManager encapsulates all functionality within Serf for handling
+// encryption keyring changes across a cluster.
+type KeyManager struct {
+	serf *Serf
+
+	// Lock to protect read and write operations
+	l sync.RWMutex
+}
+
+// keyRequest is used to contain input parameters which get broadcasted to all
+// nodes as part of a key query operation.
+type keyRequest struct {
+	Key []byte
+}
+
+// KeyResponse is used to relay a query for a list of all keys in use.
+type KeyResponse struct {
+	Messages map[string]string // Map of node name to response message
+	NumNodes int               // Total nodes memberlist knows of
+	NumResp  int               // Total responses received
+	NumErr   int               // Total errors from request
+
+	// Keys is a mapping of the base64-encoded value of the key bytes to the
+	// number of nodes that have the key installed.
+	Keys map[string]int
+}
+
+// streamKeyResp takes care of reading responses from a channel and composing
+// them into a KeyResponse. It will update a KeyResponse *in place* and
+// therefore has nothing to return.
+func (k *KeyManager) streamKeyResp(resp *KeyResponse, ch <-chan NodeResponse) {
+	for r := range ch {
+		var nodeResponse nodeKeyResponse
+
+		resp.NumResp++
+
+		// Decode the response
+		if len(r.Payload) < 1 || messageType(r.Payload[0]) != messageKeyResponseType {
+			resp.Messages[r.From] = fmt.Sprintf(
+				"Invalid key query response type: %v", r.Payload)
+			resp.NumErr++
+			goto NEXT
+		}
+		if err := decodeMessage(r.Payload[1:], &nodeResponse); err != nil {
+			resp.Messages[r.From] = fmt.Sprintf(
+				"Failed to decode key query response: %v", r.Payload)
+			resp.NumErr++
+			goto NEXT
+		}
+
+		if !nodeResponse.Result {
+			resp.Messages[r.From] = nodeResponse.Message
+			resp.NumErr++
+		}
+
+		// Currently only used for key list queries, this adds keys to a counter
+		// and increments them for each node response which contains them.
+		for _, key := range nodeResponse.Keys {
+			if _, ok := resp.Keys[key]; !ok {
+				resp.Keys[key] = 1
+			} else {
+				resp.Keys[key]++
+			}
+		}
+
+	NEXT:
+		// Return early if all nodes have responded. This allows us to avoid
+		// waiting for the full timeout when there is nothing left to do.
+		if resp.NumResp == resp.NumNodes {
+			return
+		}
+	}
+}
+
+// handleKeyRequest performs query broadcasting to all members for any type of
+// key operation and manages gathering responses and packing them up into a
+// KeyResponse for uniform response handling.
+func (k *KeyManager) handleKeyRequest(key, query string) (*KeyResponse, error) {
+	resp := &KeyResponse{
+		Messages: make(map[string]string),
+		Keys:     make(map[string]int),
+	}
+	qName := internalQueryName(query)
+
+	// Decode the new key into raw bytes
+	rawKey, err := base64.StdEncoding.DecodeString(key)
+	if err != nil {
+		return resp, err
+	}
+
+	// Encode the query request
+	req, err := encodeMessage(messageKeyRequestType, keyRequest{Key: rawKey})
+	if err != nil {
+		return resp, err
+	}
+
+	qParam := k.serf.DefaultQueryParams()
+	queryResp, err := k.serf.Query(qName, req, qParam)
+	if err != nil {
+		return resp, err
+	}
+
+	// Handle the response stream and populate the KeyResponse
+	resp.NumNodes = k.serf.memberlist.NumMembers()
+	k.streamKeyResp(resp, queryResp.respCh)
+
+	// Check the response for any reported failure conditions
+	if resp.NumErr != 0 {
+		return resp, fmt.Errorf("%d/%d nodes reported failure", resp.NumErr, resp.NumNodes)
+	}
+	if resp.NumResp != resp.NumNodes {
+		return resp, fmt.Errorf("%d/%d nodes reported success", resp.NumResp, resp.NumNodes)
+	}
+
+	return resp, nil
+}
+
+// InstallKey handles broadcasting a query to all members and gathering
+// responses from each of them, returning a list of messages from each node
+// and any applicable error conditions.
+func (k *KeyManager) InstallKey(key string) (*KeyResponse, error) {
+	k.l.Lock()
+	defer k.l.Unlock()
+
+	return k.handleKeyRequest(key, installKeyQuery)
+}
+
+// UseKey handles broadcasting a primary key change to all members in the
+// cluster, and gathering any response messages. If successful, there should
+// be an empty KeyResponse returned.
+func (k *KeyManager) UseKey(key string) (*KeyResponse, error) {
+	k.l.Lock()
+	defer k.l.Unlock()
+
+	return k.handleKeyRequest(key, useKeyQuery)
+}
+
+// RemoveKey handles broadcasting a key to the cluster for removal. Each member
+// will receive this event, and if they have the key in their keyring, remove
+// it. If any errors are encountered, RemoveKey will collect and relay them.
+func (k *KeyManager) RemoveKey(key string) (*KeyResponse, error) {
+	k.l.Lock()
+	defer k.l.Unlock()
+
+	return k.handleKeyRequest(key, removeKeyQuery)
+}
+
+// ListKeys is used to collect installed keys from members in a Serf cluster
+// and return an aggregated list of all installed keys. This is useful to
+// operators to ensure that there are no lingering keys installed on any agents.
+// Since having multiple keys installed can cause performance penalties in some
+// cases, it's important to verify this information and remove unneeded keys.
+func (k *KeyManager) ListKeys() (*KeyResponse, error) {
+	k.l.RLock()
+	defer k.l.RUnlock()
+
+	return k.handleKeyRequest("", listKeysQuery)
+}

vendor/src/github.com/hashicorp/serf/serf/lamport.go

@@ -0,0 +1,45 @@
+package serf
+
+import (
+	"sync/atomic"
+)
+
+// LamportClock is a thread safe implementation of a lamport clock. It
+// uses efficient atomic operations for all of its functions, falling back
+// to a heavy lock only if there are enough CAS failures.
+type LamportClock struct {
+	counter uint64
+}
+
+// LamportTime is the value of a LamportClock.
+type LamportTime uint64
+
+// Time is used to return the current value of the lamport clock
+func (l *LamportClock) Time() LamportTime {
+	return LamportTime(atomic.LoadUint64(&l.counter))
+}
+
+// Increment is used to increment and return the value of the lamport clock
+func (l *LamportClock) Increment() LamportTime {
+	return LamportTime(atomic.AddUint64(&l.counter, 1))
+}
+
+// Witness is called to update our local clock if necessary after
+// witnessing a clock value received from another process
+func (l *LamportClock) Witness(v LamportTime) {
+WITNESS:
+	// If the other value is old, we do not need to do anything
+	cur := atomic.LoadUint64(&l.counter)
+	other := uint64(v)
+	if other < cur {
+		return
+	}
+
+	// Ensure that our local clock is at least one ahead.
+	if !atomic.CompareAndSwapUint64(&l.counter, cur, other+1) {
+		// The CAS failed, so we just retry. Eventually our CAS should
+		// succeed or a future witness will pass us by and our witness
+		// will end.
+		goto WITNESS
+	}
+}

vendor/src/github.com/hashicorp/serf/serf/merge_delegate.go

@@ -0,0 +1,35 @@
+package serf
+
+import (
+	"net"
+
+	"github.com/hashicorp/memberlist"
+)
+
+type MergeDelegate interface {
+	NotifyMerge([]*Member) (cancel bool)
+}
+
+type mergeDelegate struct {
+	serf *Serf
+}
+
+func (m *mergeDelegate) NotifyMerge(nodes []*memberlist.Node) (cancel bool) {
+	members := make([]*Member, len(nodes))
+	for idx, n := range nodes {
+		members[idx] = &Member{
+			Name:        n.Name,
+			Addr:        net.IP(n.Addr),
+			Port:        n.Port,
+			Tags:        m.serf.decodeTags(n.Meta),
+			Status:      StatusNone,
+			ProtocolMin: n.PMin,
+			ProtocolMax: n.PMax,
+			ProtocolCur: n.PCur,
+			DelegateMin: n.DMin,
+			DelegateMax: n.DMax,
+			DelegateCur: n.DCur,
+		}
+	}
+	return m.serf.config.Merge.NotifyMerge(members)
+}

vendor/src/github.com/hashicorp/serf/serf/messages.go

@@ -0,0 +1,147 @@
+package serf
+
+import (
+	"bytes"
+	"github.com/hashicorp/go-msgpack/codec"
+	"time"
+)
+
+// messageType are the types of gossip messages Serf will send along
+// memberlist.
+type messageType uint8
+
+const (
+	messageLeaveType messageType = iota
+	messageJoinType
+	messagePushPullType
+	messageUserEventType
+	messageQueryType
+	messageQueryResponseType
+	messageConflictResponseType
+	messageKeyRequestType
+	messageKeyResponseType
+)
+
+const (
+	// Ack flag is used to force receiver to send an ack back
+	queryFlagAck uint32 = 1 << iota
+
+	// NoBroadcast is used to prevent re-broadcast of a query.
+	// this can be used to selectively send queries to individual members
+	queryFlagNoBroadcast
+)
+
+// filterType is used with a queryFilter to specify the type of
+// filter we are sending
+type filterType uint8
+
+const (
+	filterNodeType filterType = iota
+	filterTagType
+)
+
+// messageJoin is the message broadcasted after we join to
+// associated the node with a lamport clock
+type messageJoin struct {
+	LTime LamportTime
+	Node  string
+}
+
+// messageLeave is the message broadcasted to signal the intentional to
+// leave.
+type messageLeave struct {
+	LTime LamportTime
+	Node  string
+}
+
+// messagePushPullType is used when doing a state exchange. This
+// is a relatively large message, but is sent infrequently
+type messagePushPull struct {
+	LTime        LamportTime            // Current node lamport time
+	StatusLTimes map[string]LamportTime // Maps the node to its status time
+	LeftMembers  []string               // List of left nodes
+	EventLTime   LamportTime            // Lamport time for event clock
+	Events       []*userEvents          // Recent events
+	QueryLTime   LamportTime            // Lamport time for query clock
+}
+
+// messageUserEvent is used for user-generated events
+type messageUserEvent struct {
+	LTime   LamportTime
+	Name    string
+	Payload []byte
+	CC      bool // "Can Coalesce". Zero value is compatible with Serf 0.1
+}
+
+// messageQuery is used for query events
+type messageQuery struct {
+	LTime   LamportTime   // Event lamport time
+	ID      uint32        // Query ID, randomly generated
+	Addr    []byte        // Source address, used for a direct reply
+	Port    uint16        // Source port, used for a direct reply
+	Filters [][]byte      // Potential query filters
+	Flags   uint32        // Used to provide various flags
+	Timeout time.Duration // Maximum time between delivery and response
+	Name    string        // Query name
+	Payload []byte        // Query payload
+}
+
+// Ack checks if the ack flag is set
+func (m *messageQuery) Ack() bool {
+	return (m.Flags & queryFlagAck) != 0
+}
+
+// NoBroadcast checks if the no broadcast flag is set
+func (m *messageQuery) NoBroadcast() bool {
+	return (m.Flags & queryFlagNoBroadcast) != 0
+}
+
+// filterNode is used with the filterNodeType, and is a list
+// of node names
+type filterNode []string
+
+// filterTag is used with the filterTagType and is a regular
+// expression to apply to a tag
+type filterTag struct {
+	Tag  string
+	Expr string
+}
+
+// messageQueryResponse is used to respond to a query
+type messageQueryResponse struct {
+	LTime   LamportTime // Event lamport time
+	ID      uint32      // Query ID
+	From    string      // Node name
+	Flags   uint32      // Used to provide various flags
+	Payload []byte      // Optional response payload
+}
+
+// Ack checks if the ack flag is set
+func (m *messageQueryResponse) Ack() bool {
+	return (m.Flags & queryFlagAck) != 0
+}
+
+func decodeMessage(buf []byte, out interface{}) error {
+	var handle codec.MsgpackHandle
+	return codec.NewDecoder(bytes.NewReader(buf), &handle).Decode(out)
+}
+
+func encodeMessage(t messageType, msg interface{}) ([]byte, error) {
+	buf := bytes.NewBuffer(nil)
+	buf.WriteByte(uint8(t))
+
+	handle := codec.MsgpackHandle{}
+	encoder := codec.NewEncoder(buf, &handle)
+	err := encoder.Encode(msg)
+	return buf.Bytes(), err
+}
+
+func encodeFilter(f filterType, filt interface{}) ([]byte, error) {
+	buf := bytes.NewBuffer(nil)
+	buf.WriteByte(uint8(f))
+
+	handle := codec.MsgpackHandle{}
+	encoder := codec.NewEncoder(buf, &handle)
+	err := encoder.Encode(filt)
+	return buf.Bytes(), err
+}

vendor/src/github.com/hashicorp/serf/serf/query.go

@@ -0,0 +1,210 @@
+package serf
+
+import (
+	"math"
+	"regexp"
+	"sync"
+	"time"
+)
+
+// QueryParam is provided to Query() to configure the parameters of the
+// query. If not provided, sane defaults will be used.
+type QueryParam struct {
+	// If provided, we restrict the nodes that should respond to those
+	// with names in this list
+	FilterNodes []string
+
+	// FilterTags maps a tag name to a regular expression that is applied
+	// to restrict the nodes that should respond
+	FilterTags map[string]string
+
+	// If true, we are requesting an delivery acknowledgement from
+	// every node that meets the filter requirement. This means nodes
+	// the receive the message but do not pass the filters, will not
+	// send an ack.
+	RequestAck bool
+
+	// The timeout limits how long the query is left open. If not provided,
+	// then a default timeout is used based on the configuration of Serf
+	Timeout time.Duration
+}
+
+// DefaultQueryTimeout returns the default timeout value for a query
+// Computed as GossipInterval * QueryTimeoutMult * log(N+1)
+func (s *Serf) DefaultQueryTimeout() time.Duration {
+	n := s.memberlist.NumMembers()
+	timeout := s.config.MemberlistConfig.GossipInterval
+	timeout *= time.Duration(s.config.QueryTimeoutMult)
+	timeout *= time.Duration(math.Ceil(math.Log10(float64(n + 1))))
+	return timeout
+}
+
+// DefaultQueryParam is used to return the default query parameters
+func (s *Serf) DefaultQueryParams() *QueryParam {
+	return &QueryParam{
+		FilterNodes: nil,
+		FilterTags:  nil,
+		RequestAck:  false,
+		Timeout:     s.DefaultQueryTimeout(),
+	}
+}
+
+// encodeFilters is used to convert the filters into the wire format
+func (q *QueryParam) encodeFilters() ([][]byte, error) {
+	var filters [][]byte
+
+	// Add the node filter
+	if len(q.FilterNodes) > 0 {
+		if buf, err := encodeFilter(filterNodeType, q.FilterNodes); err != nil {
+			return nil, err
+		} else {
+			filters = append(filters, buf)
+		}
+	}
+
+	// Add the tag filters
+	for tag, expr := range q.FilterTags {
+		filt := filterTag{tag, expr}
+		if buf, err := encodeFilter(filterTagType, &filt); err != nil {
+			return nil, err
+		} else {
+			filters = append(filters, buf)
+		}
+	}
+
+	return filters, nil
+}
+
+// QueryResponse is returned for each new Query. It is used to collect
+// Ack's as well as responses and to provide those back to a client.
+type QueryResponse struct {
+	// ackCh is used to send the name of a node for which we've received an ack
+	ackCh chan string
+
+	// deadline is the query end time (start + query timeout)
+	deadline time.Time
+
+	// Query ID
+	id uint32
+
+	// Stores the LTime of the query
+	lTime LamportTime
+
+	// respCh is used to send a response from a node
+	respCh chan NodeResponse
+
+	closed    bool
+	closeLock sync.Mutex
+}
+
+// newQueryResponse is used to construct a new query response
+func newQueryResponse(n int, q *messageQuery) *QueryResponse {
+	resp := &QueryResponse{
+		deadline: time.Now().Add(q.Timeout),
+		id:       q.ID,
+		lTime:    q.LTime,
+		respCh:   make(chan NodeResponse, n),
+	}
+	if q.Ack() {
+		resp.ackCh = make(chan string, n)
+	}
+	return resp
+}
+
+// Close is used to close the query, which will close the underlying
+// channels and prevent further deliveries
+func (r *QueryResponse) Close() {
+	r.closeLock.Lock()
+	defer r.closeLock.Unlock()
+	if r.closed {
+		return
+	}
+	r.closed = true
+	if r.ackCh != nil {
+		close(r.ackCh)
+	}
+	if r.respCh != nil {
+		close(r.respCh)
+	}
+}
+
+// Deadline returns the ending deadline of the query
+func (r *QueryResponse) Deadline() time.Time {
+	return r.deadline
+}
+
+// Finished returns if the query is finished running
+func (r *QueryResponse) Finished() bool {
+	return r.closed || time.Now().After(r.deadline)
+}
+
+// AckCh returns a channel that can be used to listen for acks
+// Channel will be closed when the query is finished. This is nil,
+// if the query did not specify RequestAck.
+func (r *QueryResponse) AckCh() <-chan string {
+	return r.ackCh
+}
+
+// ResponseCh returns a channel that can be used to listen for responses.
+// Channel will be closed when the query is finished.
+func (r *QueryResponse) ResponseCh() <-chan NodeResponse {
+	return r.respCh
+}
+
+// NodeResponse is used to represent a single response from a node
+type NodeResponse struct {
+	From    string
+	Payload []byte
+}
+
+// shouldProcessQuery checks if a query should be proceeded given
+// a set of filers.
+func (s *Serf) shouldProcessQuery(filters [][]byte) bool {
+	for _, filter := range filters {
+		switch filterType(filter[0]) {
+		case filterNodeType:
+			// Decode the filter
+			var nodes filterNode
+			if err := decodeMessage(filter[1:], &nodes); err != nil {
+				s.logger.Printf("[WARN] serf: failed to decode filterNodeType: %v", err)
+				return false
+			}
+
+			// Check if we are being targeted
+			found := false
+			for _, n := range nodes {
+				if n == s.config.NodeName {
+					found = true
+					break
+				}
+			}
+			if !found {
+				return false
+			}
+
+		case filterTagType:
+			// Decode the filter
+			var filt filterTag
+			if err := decodeMessage(filter[1:], &filt); err != nil {
+				s.logger.Printf("[WARN] serf: failed to decode filterTagType: %v", err)
+				return false
+			}
+
+			// Check if we match this regex
+			tags := s.config.Tags
+			matched, err := regexp.MatchString(filt.Expr, tags[filt.Tag])
+			if err != nil {
+				s.logger.Printf("[WARN] serf: failed to compile filter regex (%s): %v", filt.Expr, err)
+				return false
+			}
+			if !matched {
+				return false
+			}
+
+		default:
+			s.logger.Printf("[WARN] serf: query has unrecognized filter type: %d", filter[0])
+			return false
+		}
+	}
+	return true
+}