132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
// +build !solaris
|
|
|
|
package daemon
|
|
|
|
import (
|
|
"bufio"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
"github.com/docker/docker/api/types"
|
|
"github.com/docker/docker/container"
|
|
"github.com/docker/docker/pkg/pubsub"
|
|
)
|
|
|
|
type statsSupervisor interface {
|
|
// GetContainerStats collects all the stats related to a container
|
|
GetContainerStats(container *container.Container) (*types.StatsJSON, error)
|
|
}
|
|
|
|
// newStatsCollector returns a new statsCollector that collections
|
|
// stats for a registered container at the specified interval.
|
|
// The collector allows non-running containers to be added
|
|
// and will start processing stats when they are started.
|
|
func (daemon *Daemon) newStatsCollector(interval time.Duration) *statsCollector {
|
|
s := &statsCollector{
|
|
interval: interval,
|
|
supervisor: daemon,
|
|
publishers: make(map[*container.Container]*pubsub.Publisher),
|
|
bufReader: bufio.NewReaderSize(nil, 128),
|
|
}
|
|
platformNewStatsCollector(s)
|
|
go s.run()
|
|
return s
|
|
}
|
|
|
|
// statsCollector manages and provides container resource stats
|
|
type statsCollector struct {
|
|
m sync.Mutex
|
|
supervisor statsSupervisor
|
|
interval time.Duration
|
|
publishers map[*container.Container]*pubsub.Publisher
|
|
bufReader *bufio.Reader
|
|
|
|
// The following fields are not set on Windows currently.
|
|
clockTicksPerSecond uint64
|
|
machineMemory uint64
|
|
}
|
|
|
|
// collect registers the container with the collector and adds it to
|
|
// the event loop for collection on the specified interval returning
|
|
// a channel for the subscriber to receive on.
|
|
func (s *statsCollector) collect(c *container.Container) chan interface{} {
|
|
s.m.Lock()
|
|
defer s.m.Unlock()
|
|
publisher, exists := s.publishers[c]
|
|
if !exists {
|
|
publisher = pubsub.NewPublisher(100*time.Millisecond, 1024)
|
|
s.publishers[c] = publisher
|
|
}
|
|
return publisher.Subscribe()
|
|
}
|
|
|
|
// stopCollection closes the channels for all subscribers and removes
|
|
// the container from metrics collection.
|
|
func (s *statsCollector) stopCollection(c *container.Container) {
|
|
s.m.Lock()
|
|
if publisher, exists := s.publishers[c]; exists {
|
|
publisher.Close()
|
|
delete(s.publishers, c)
|
|
}
|
|
s.m.Unlock()
|
|
}
|
|
|
|
// unsubscribe removes a specific subscriber from receiving updates for a container's stats.
|
|
func (s *statsCollector) unsubscribe(c *container.Container, ch chan interface{}) {
|
|
s.m.Lock()
|
|
publisher := s.publishers[c]
|
|
if publisher != nil {
|
|
publisher.Evict(ch)
|
|
if publisher.Len() == 0 {
|
|
delete(s.publishers, c)
|
|
}
|
|
}
|
|
s.m.Unlock()
|
|
}
|
|
|
|
func (s *statsCollector) run() {
|
|
type publishersPair struct {
|
|
container *container.Container
|
|
publisher *pubsub.Publisher
|
|
}
|
|
// we cannot determine the capacity here.
|
|
// it will grow enough in first iteration
|
|
var pairs []publishersPair
|
|
|
|
for range time.Tick(s.interval) {
|
|
// it does not make sense in the first iteration,
|
|
// but saves allocations in further iterations
|
|
pairs = pairs[:0]
|
|
|
|
s.m.Lock()
|
|
for container, publisher := range s.publishers {
|
|
// copy pointers here to release the lock ASAP
|
|
pairs = append(pairs, publishersPair{container, publisher})
|
|
}
|
|
s.m.Unlock()
|
|
if len(pairs) == 0 {
|
|
continue
|
|
}
|
|
|
|
systemUsage, err := s.getSystemCPUUsage()
|
|
if err != nil {
|
|
logrus.Errorf("collecting system cpu usage: %v", err)
|
|
continue
|
|
}
|
|
|
|
for _, pair := range pairs {
|
|
stats, err := s.supervisor.GetContainerStats(pair.container)
|
|
if err != nil {
|
|
if _, ok := err.(errNotRunning); !ok {
|
|
logrus.Errorf("collecting stats for %s: %v", pair.container.ID, err)
|
|
}
|
|
continue
|
|
}
|
|
// FIXME: move to containerd on Linux (not Windows)
|
|
stats.CPUStats.SystemUsage = systemUsage
|
|
|
|
pair.publisher.Publish(*stats)
|
|
}
|
|
}
|
|
}
|