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vendor: update swarmkit to 9f271c2 and remove boltdb

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Signed-off-by: Tibor Vass <tibor@docker.com>
This commit is contained in:
Tibor Vass 2018-09-24 17:36:07 +00:00
parent 2a63a5f7a5
commit 82388d048a
41 changed files with 661 additions and 5915 deletions
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3
vendor.conf
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@ -59,7 +59,6 @@ github.com/coreos/etcd v3.3.9
github.com/coreos/go-semver v0.2.0
github.com/ugorji/go v1.1.1
github.com/hashicorp/consul v0.5.2
github.com/boltdb/bolt fff57c100f4dea1905678da7e90d92429dff2904
github.com/miekg/dns v1.0.7
github.com/ishidawataru/sctp 07191f837fedd2f13d1ec7b5f885f0f3ec54b1cb
go.etcd.io/bbolt v1.3.1-etcd.8
@ -126,7 +125,7 @@ github.com/containerd/ttrpc 94dde388801693c54f88a6596f713b51a8b30b2d
github.com/gogo/googleapis 08a7655d27152912db7aaf4f983275eaf8d128ef
# cluster
github.com/docker/swarmkit d7d23d763a2d47ad6e540f81ab3609f6c323e9be
github.com/docker/swarmkit 9f271c2963d18a7c60d2c4001fb418ca4037df19
github.com/gogo/protobuf v1.0.0
github.com/cloudflare/cfssl 1.3.2
github.com/fernet/fernet-go 1b2437bc582b3cfbb341ee5a29f8ef5b42912ff2

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@ -1,20 +0,0 @@
The MIT License (MIT)
Copyright (c) 2013 Ben Johnson
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.

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vendor/github.com/boltdb/bolt/README.md generated vendored
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@ -1,857 +0,0 @@
Bolt [![Coverage Status](https://coveralls.io/repos/boltdb/bolt/badge.svg?branch=master)](https://coveralls.io/r/boltdb/bolt?branch=master) [![GoDoc](https://godoc.org/github.com/boltdb/bolt?status.svg)](https://godoc.org/github.com/boltdb/bolt) ![Version](https://img.shields.io/badge/version-1.2.1-green.svg)
====
Bolt is a pure Go key/value store inspired by [Howard Chu's][hyc_symas]
[LMDB project][lmdb]. The goal of the project is to provide a simple,
fast, and reliable database for projects that don't require a full database
server such as Postgres or MySQL.
Since Bolt is meant to be used as such a low-level piece of functionality,
simplicity is key. The API will be small and only focus on getting values
and setting values. That's it.
[hyc_symas]: https://twitter.com/hyc_symas
[lmdb]: http://symas.com/mdb/
## Project Status
Bolt is stable, the API is fixed, and the file format is fixed. Full unit
test coverage and randomized black box testing are used to ensure database
consistency and thread safety. Bolt is currently in high-load production
environments serving databases as large as 1TB. Many companies such as
Shopify and Heroku use Bolt-backed services every day.
## Table of Contents
- [Getting Started](#getting-started)
- [Installing](#installing)
- [Opening a database](#opening-a-database)
- [Transactions](#transactions)
- [Read-write transactions](#read-write-transactions)
- [Read-only transactions](#read-only-transactions)
- [Batch read-write transactions](#batch-read-write-transactions)
- [Managing transactions manually](#managing-transactions-manually)
- [Using buckets](#using-buckets)
- [Using key/value pairs](#using-keyvalue-pairs)
- [Autoincrementing integer for the bucket](#autoincrementing-integer-for-the-bucket)
- [Iterating over keys](#iterating-over-keys)
- [Prefix scans](#prefix-scans)
- [Range scans](#range-scans)
- [ForEach()](#foreach)
- [Nested buckets](#nested-buckets)
- [Database backups](#database-backups)
- [Statistics](#statistics)
- [Read-Only Mode](#read-only-mode)
- [Mobile Use (iOS/Android)](#mobile-use-iosandroid)
- [Resources](#resources)
- [Comparison with other databases](#comparison-with-other-databases)
- [Postgres, MySQL, & other relational databases](#postgres-mysql--other-relational-databases)
- [LevelDB, RocksDB](#leveldb-rocksdb)
- [LMDB](#lmdb)
- [Caveats & Limitations](#caveats--limitations)
- [Reading the Source](#reading-the-source)
- [Other Projects Using Bolt](#other-projects-using-bolt)
## Getting Started
### Installing
To start using Bolt, install Go and run `go get`:
```sh
$ go get github.com/boltdb/bolt/...
```
This will retrieve the library and install the `bolt` command line utility into
your `$GOBIN` path.
### Opening a database
The top-level object in Bolt is a `DB`. It is represented as a single file on
your disk and represents a consistent snapshot of your data.
To open your database, simply use the `bolt.Open()` function:
```go
package main
import (
"log"
"github.com/boltdb/bolt"
)
func main() {
// Open the my.db data file in your current directory.
// It will be created if it doesn't exist.
db, err := bolt.Open("my.db", 0600, nil)
if err != nil {
log.Fatal(err)
}
defer db.Close()
...
}
```
Please note that Bolt obtains a file lock on the data file so multiple processes
cannot open the same database at the same time. Opening an already open Bolt
database will cause it to hang until the other process closes it. To prevent
an indefinite wait you can pass a timeout option to the `Open()` function:
```go
db, err := bolt.Open("my.db", 0600, &bolt.Options{Timeout: 1 * time.Second})
```
### Transactions
Bolt allows only one read-write transaction at a time but allows as many
read-only transactions as you want at a time. Each transaction has a consistent
view of the data as it existed when the transaction started.
Individual transactions and all objects created from them (e.g. buckets, keys)
are not thread safe. To work with data in multiple goroutines you must start
a transaction for each one or use locking to ensure only one goroutine accesses
a transaction at a time. Creating transaction from the `DB` is thread safe.
Read-only transactions and read-write transactions should not depend on one
another and generally shouldn't be opened simultaneously in the same goroutine.
This can cause a deadlock as the read-write transaction needs to periodically
re-map the data file but it cannot do so while a read-only transaction is open.
#### Read-write transactions
To start a read-write transaction, you can use the `DB.Update()` function:
```go
err := db.Update(func(tx *bolt.Tx) error {
...
return nil
})
```
Inside the closure, you have a consistent view of the database. You commit the
transaction by returning `nil` at the end. You can also rollback the transaction
at any point by returning an error. All database operations are allowed inside
a read-write transaction.
Always check the return error as it will report any disk failures that can cause
your transaction to not complete. If you return an error within your closure
it will be passed through.
#### Read-only transactions
To start a read-only transaction, you can use the `DB.View()` function:
```go
err := db.View(func(tx *bolt.Tx) error {
...
return nil
})
```
You also get a consistent view of the database within this closure, however,
no mutating operations are allowed within a read-only transaction. You can only
retrieve buckets, retrieve values, and copy the database within a read-only
transaction.
#### Batch read-write transactions
Each `DB.Update()` waits for disk to commit the writes. This overhead
can be minimized by combining multiple updates with the `DB.Batch()`
function:
```go
err := db.Batch(func(tx *bolt.Tx) error {
...
return nil
})
```
Concurrent Batch calls are opportunistically combined into larger
transactions. Batch is only useful when there are multiple goroutines
calling it.
The trade-off is that `Batch` can call the given
function multiple times, if parts of the transaction fail. The
function must be idempotent and side effects must take effect only
after a successful return from `DB.Batch()`.
For example: don't display messages from inside the function, instead
set variables in the enclosing scope:
```go
var id uint64
err := db.Batch(func(tx *bolt.Tx) error {
// Find last key in bucket, decode as bigendian uint64, increment
// by one, encode back to []byte, and add new key.
...
id = newValue
return nil
})
if err != nil {
return ...
}
fmt.Println("Allocated ID %d", id)
```
#### Managing transactions manually
The `DB.View()` and `DB.Update()` functions are wrappers around the `DB.Begin()`
function. These helper functions will start the transaction, execute a function,
and then safely close your transaction if an error is returned. This is the
recommended way to use Bolt transactions.
However, sometimes you may want to manually start and end your transactions.
You can use the `DB.Begin()` function directly but **please** be sure to close
the transaction.
```go
// Start a writable transaction.
tx, err := db.Begin(true)
if err != nil {
return err
}
defer tx.Rollback()
// Use the transaction...
_, err := tx.CreateBucket([]byte("MyBucket"))
if err != nil {
return err
}
// Commit the transaction and check for error.
if err := tx.Commit(); err != nil {
return err
}
```
The first argument to `DB.Begin()` is a boolean stating if the transaction
should be writable.
### Using buckets
Buckets are collections of key/value pairs within the database. All keys in a
bucket must be unique. You can create a bucket using the `DB.CreateBucket()`
function:
```go
db.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucket([]byte("MyBucket"))
if err != nil {
return fmt.Errorf("create bucket: %s", err)
}
return nil
})
```
You can also create a bucket only if it doesn't exist by using the
`Tx.CreateBucketIfNotExists()` function. It's a common pattern to call this
function for all your top-level buckets after you open your database so you can
guarantee that they exist for future transactions.
To delete a bucket, simply call the `Tx.DeleteBucket()` function.
### Using key/value pairs
To save a key/value pair to a bucket, use the `Bucket.Put()` function:
```go
db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte("MyBucket"))
err := b.Put([]byte("answer"), []byte("42"))
return err
})
```
This will set the value of the `"answer"` key to `"42"` in the `MyBucket`
bucket. To retrieve this value, we can use the `Bucket.Get()` function:
```go
db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte("MyBucket"))
v := b.Get([]byte("answer"))
fmt.Printf("The answer is: %s\n", v)
return nil
})
```
The `Get()` function does not return an error because its operation is
guaranteed to work (unless there is some kind of system failure). If the key
exists then it will return its byte slice value. If it doesn't exist then it
will return `nil`. It's important to note that you can have a zero-length value
set to a key which is different than the key not existing.
Use the `Bucket.Delete()` function to delete a key from the bucket.
Please note that values returned from `Get()` are only valid while the
transaction is open. If you need to use a value outside of the transaction
then you must use `copy()` to copy it to another byte slice.
### Autoincrementing integer for the bucket
By using the `NextSequence()` function, you can let Bolt determine a sequence
which can be used as the unique identifier for your key/value pairs. See the
example below.
```go
// CreateUser saves u to the store. The new user ID is set on u once the data is persisted.
func (s *Store) CreateUser(u *User) error {
return s.db.Update(func(tx *bolt.Tx) error {
// Retrieve the users bucket.
// This should be created when the DB is first opened.
b := tx.Bucket([]byte("users"))
// Generate ID for the user.
// This returns an error only if the Tx is closed or not writeable.
// That can't happen in an Update() call so I ignore the error check.
id, _ := b.NextSequence()
u.ID = int(id)
// Marshal user data into bytes.
buf, err := json.Marshal(u)
if err != nil {
return err
}
// Persist bytes to users bucket.
return b.Put(itob(u.ID), buf)
})
}
// itob returns an 8-byte big endian representation of v.
func itob(v int) []byte {
b := make([]byte, 8)
binary.BigEndian.PutUint64(b, uint64(v))
return b
}
type User struct {
ID int
...
}
```
### Iterating over keys
Bolt stores its keys in byte-sorted order within a bucket. This makes sequential
iteration over these keys extremely fast. To iterate over keys we'll use a
`Cursor`:
```go
db.View(func(tx *bolt.Tx) error {
// Assume bucket exists and has keys
b := tx.Bucket([]byte("MyBucket"))
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
fmt.Printf("key=%s, value=%s\n", k, v)
}
return nil
})
```
The cursor allows you to move to a specific point in the list of keys and move
forward or backward through the keys one at a time.
The following functions are available on the cursor:
```
First() Move to the first key.
Last() Move to the last key.
Seek() Move to a specific key.
Next() Move to the next key.
Prev() Move to the previous key.
```
Each of those functions has a return signature of `(key []byte, value []byte)`.
When you have iterated to the end of the cursor then `Next()` will return a
`nil` key. You must seek to a position using `First()`, `Last()`, or `Seek()`
before calling `Next()` or `Prev()`. If you do not seek to a position then
these functions will return a `nil` key.
During iteration, if the key is non-`nil` but the value is `nil`, that means
the key refers to a bucket rather than a value. Use `Bucket.Bucket()` to
access the sub-bucket.
#### Prefix scans
To iterate over a key prefix, you can combine `Seek()` and `bytes.HasPrefix()`:
```go
db.View(func(tx *bolt.Tx) error {
// Assume bucket exists and has keys
c := tx.Bucket([]byte("MyBucket")).Cursor()
prefix := []byte("1234")
for k, v := c.Seek(prefix); bytes.HasPrefix(k, prefix); k, v = c.Next() {
fmt.Printf("key=%s, value=%s\n", k, v)
}
return nil
})
```
#### Range scans
Another common use case is scanning over a range such as a time range. If you
use a sortable time encoding such as RFC3339 then you can query a specific
date range like this:
```go
db.View(func(tx *bolt.Tx) error {
// Assume our events bucket exists and has RFC3339 encoded time keys.
c := tx.Bucket([]byte("Events")).Cursor()
// Our time range spans the 90's decade.
min := []byte("1990-01-01T00:00:00Z")
max := []byte("2000-01-01T00:00:00Z")
// Iterate over the 90's.
for k, v := c.Seek(min); k != nil && bytes.Compare(k, max) <= 0; k, v = c.Next() {
fmt.Printf("%s: %s\n", k, v)
}
return nil
})
```
Note that, while RFC3339 is sortable, the Golang implementation of RFC3339Nano does not use a fixed number of digits after the decimal point and is therefore not sortable.
#### ForEach()
You can also use the function `ForEach()` if you know you'll be iterating over
all the keys in a bucket:
```go
db.View(func(tx *bolt.Tx) error {
// Assume bucket exists and has keys
b := tx.Bucket([]byte("MyBucket"))
b.ForEach(func(k, v []byte) error {
fmt.Printf("key=%s, value=%s\n", k, v)
return nil
})
return nil
})
```
Please note that keys and values in `ForEach()` are only valid while
the transaction is open. If you need to use a key or value outside of
the transaction, you must use `copy()` to copy it to another byte
slice.
### Nested buckets
You can also store a bucket in a key to create nested buckets. The API is the
same as the bucket management API on the `DB` object:
```go
func (*Bucket) CreateBucket(key []byte) (*Bucket, error)
func (*Bucket) CreateBucketIfNotExists(key []byte) (*Bucket, error)
func (*Bucket) DeleteBucket(key []byte) error
```
### Database backups
Bolt is a single file so it's easy to backup. You can use the `Tx.WriteTo()`
function to write a consistent view of the database to a writer. If you call
this from a read-only transaction, it will perform a hot backup and not block
your other database reads and writes.
By default, it will use a regular file handle which will utilize the operating
system's page cache. See the [`Tx`](https://godoc.org/github.com/boltdb/bolt#Tx)
documentation for information about optimizing for larger-than-RAM datasets.
One common use case is to backup over HTTP so you can use tools like `cURL` to
do database backups:
```go
func BackupHandleFunc(w http.ResponseWriter, req *http.Request) {
err := db.View(func(tx *bolt.Tx) error {
w.Header().Set("Content-Type", "application/octet-stream")
w.Header().Set("Content-Disposition", `attachment; filename="my.db"`)
w.Header().Set("Content-Length", strconv.Itoa(int(tx.Size())))
_, err := tx.WriteTo(w)
return err
})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
```
Then you can backup using this command:
```sh
$ curl http://localhost/backup > my.db
```
Or you can open your browser to `http://localhost/backup` and it will download
automatically.
If you want to backup to another file you can use the `Tx.CopyFile()` helper
function.
### Statistics
The database keeps a running count of many of the internal operations it
performs so you can better understand what's going on. By grabbing a snapshot
of these stats at two points in time we can see what operations were performed
in that time range.
For example, we could start a goroutine to log stats every 10 seconds:
```go
go func() {
// Grab the initial stats.
prev := db.Stats()
for {
// Wait for 10s.
time.Sleep(10 * time.Second)
// Grab the current stats and diff them.
stats := db.Stats()
diff := stats.Sub(&prev)
// Encode stats to JSON and print to STDERR.
json.NewEncoder(os.Stderr).Encode(diff)
// Save stats for the next loop.
prev = stats
}
}()
```
It's also useful to pipe these stats to a service such as statsd for monitoring
or to provide an HTTP endpoint that will perform a fixed-length sample.
### Read-Only Mode
Sometimes it is useful to create a shared, read-only Bolt database. To this,
set the `Options.ReadOnly` flag when opening your database. Read-only mode
uses a shared lock to allow multiple processes to read from the database but
it will block any processes from opening the database in read-write mode.
```go
db, err := bolt.Open("my.db", 0666, &bolt.Options{ReadOnly: true})
if err != nil {
log.Fatal(err)
}
```
### Mobile Use (iOS/Android)
Bolt is able to run on mobile devices by leveraging the binding feature of the
[gomobile](https://github.com/golang/mobile) tool. Create a struct that will
contain your database logic and a reference to a `*bolt.DB` with a initializing
constructor that takes in a filepath where the database file will be stored.
Neither Android nor iOS require extra permissions or cleanup from using this method.
```go
func NewBoltDB(filepath string) *BoltDB {
db, err := bolt.Open(filepath+"/demo.db", 0600, nil)
if err != nil {
log.Fatal(err)
}
return &BoltDB{db}
}
type BoltDB struct {
db *bolt.DB
...
}
func (b *BoltDB) Path() string {
return b.db.Path()
}
func (b *BoltDB) Close() {
b.db.Close()
}
```
Database logic should be defined as methods on this wrapper struct.
To initialize this struct from the native language (both platforms now sync
their local storage to the cloud. These snippets disable that functionality for the
database file):
#### Android
```java
String path;
if (android.os.Build.VERSION.SDK_INT >=android.os.Build.VERSION_CODES.LOLLIPOP){
path = getNoBackupFilesDir().getAbsolutePath();
} else{
path = getFilesDir().getAbsolutePath();
}
Boltmobiledemo.BoltDB boltDB = Boltmobiledemo.NewBoltDB(path)
```
#### iOS
```objc
- (void)demo {
NSString* path = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,
NSUserDomainMask,
YES) objectAtIndex:0];
GoBoltmobiledemoBoltDB * demo = GoBoltmobiledemoNewBoltDB(path);
[self addSkipBackupAttributeToItemAtPath:demo.path];
//Some DB Logic would go here
[demo close];
}
- (BOOL)addSkipBackupAttributeToItemAtPath:(NSString *) filePathString
{
NSURL* URL= [NSURL fileURLWithPath: filePathString];
assert([[NSFileManager defaultManager] fileExistsAtPath: [URL path]]);
NSError *error = nil;
BOOL success = [URL setResourceValue: [NSNumber numberWithBool: YES]
forKey: NSURLIsExcludedFromBackupKey error: &error];
if(!success){
NSLog(@"Error excluding %@ from backup %@", [URL lastPathComponent], error);
}
return success;
}
```
## Resources
For more information on getting started with Bolt, check out the following articles:
* [Intro to BoltDB: Painless Performant Persistence](http://npf.io/2014/07/intro-to-boltdb-painless-performant-persistence/) by [Nate Finch](https://github.com/natefinch).
* [Bolt -- an embedded key/value database for Go](https://www.progville.com/go/bolt-embedded-db-golang/) by Progville
## Comparison with other databases
### Postgres, MySQL, & other relational databases
Relational databases structure data into rows and are only accessible through
the use of SQL. This approach provides flexibility in how you store and query
your data but also incurs overhead in parsing and planning SQL statements. Bolt
accesses all data by a byte slice key. This makes Bolt fast to read and write
data by key but provides no built-in support for joining values together.
Most relational databases (with the exception of SQLite) are standalone servers
that run separately from your application. This gives your systems
flexibility to connect multiple application servers to a single database
server but also adds overhead in serializing and transporting data over the
network. Bolt runs as a library included in your application so all data access
has to go through your application's process. This brings data closer to your
application but limits multi-process access to the data.
### LevelDB, RocksDB
LevelDB and its derivatives (RocksDB, HyperLevelDB) are similar to Bolt in that
they are libraries bundled into the application, however, their underlying
structure is a log-structured merge-tree (LSM tree). An LSM tree optimizes
random writes by using a write ahead log and multi-tiered, sorted files called
SSTables. Bolt uses a B+tree internally and only a single file. Both approaches
have trade-offs.
If you require a high random write throughput (>10,000 w/sec) or you need to use
spinning disks then LevelDB could be a good choice. If your application is
read-heavy or does a lot of range scans then Bolt could be a good choice.
One other important consideration is that LevelDB does not have transactions.
It supports batch writing of key/values pairs and it supports read snapshots
but it will not give you the ability to do a compare-and-swap operation safely.
Bolt supports fully serializable ACID transactions.
### LMDB
Bolt was originally a port of LMDB so it is architecturally similar. Both use
a B+tree, have ACID semantics with fully serializable transactions, and support
lock-free MVCC using a single writer and multiple readers.
The two projects have somewhat diverged. LMDB heavily focuses on raw performance
while Bolt has focused on simplicity and ease of use. For example, LMDB allows
several unsafe actions such as direct writes for the sake of performance. Bolt
opts to disallow actions which can leave the database in a corrupted state. The
only exception to this in Bolt is `DB.NoSync`.
There are also a few differences in API. LMDB requires a maximum mmap size when
opening an `mdb_env` whereas Bolt will handle incremental mmap resizing
automatically. LMDB overloads the getter and setter functions with multiple
flags whereas Bolt splits these specialized cases into their own functions.
## Caveats & Limitations
It's important to pick the right tool for the job and Bolt is no exception.
Here are a few things to note when evaluating and using Bolt:
* Bolt is good for read intensive workloads. Sequential write performance is
also fast but random writes can be slow. You can use `DB.Batch()` or add a
write-ahead log to help mitigate this issue.
* Bolt uses a B+tree internally so there can be a lot of random page access.
SSDs provide a significant performance boost over spinning disks.
* Try to avoid long running read transactions. Bolt uses copy-on-write so
old pages cannot be reclaimed while an old transaction is using them.
* Byte slices returned from Bolt are only valid during a transaction. Once the
transaction has been committed or rolled back then the memory they point to
can be reused by a new page or can be unmapped from virtual memory and you'll
see an `unexpected fault address` panic when accessing it.
* Be careful when using `Bucket.FillPercent`. Setting a high fill percent for
buckets that have random inserts will cause your database to have very poor
page utilization.
* Use larger buckets in general. Smaller buckets causes poor page utilization
once they become larger than the page size (typically 4KB).
* Bulk loading a lot of random writes into a new bucket can be slow as the
page will not split until the transaction is committed. Randomly inserting
more than 100,000 key/value pairs into a single new bucket in a single
transaction is not advised.
* Bolt uses a memory-mapped file so the underlying operating system handles the
caching of the data. Typically, the OS will cache as much of the file as it
can in memory and will release memory as needed to other processes. This means
that Bolt can show very high memory usage when working with large databases.
However, this is expected and the OS will release memory as needed. Bolt can
handle databases much larger than the available physical RAM, provided its
memory-map fits in the process virtual address space. It may be problematic
on 32-bits systems.
* The data structures in the Bolt database are memory mapped so the data file
will be endian specific. This means that you cannot copy a Bolt file from a
little endian machine to a big endian machine and have it work. For most
users this is not a concern since most modern CPUs are little endian.
* Because of the way pages are laid out on disk, Bolt cannot truncate data files
and return free pages back to the disk. Instead, Bolt maintains a free list
of unused pages within its data file. These free pages can be reused by later
transactions. This works well for many use cases as databases generally tend
to grow. However, it's important to note that deleting large chunks of data
will not allow you to reclaim that space on disk.
For more information on page allocation, [see this comment][page-allocation].
[page-allocation]: https://github.com/boltdb/bolt/issues/308#issuecomment-74811638
## Reading the Source
Bolt is a relatively small code base (<3KLOC) for an embedded, serializable,
transactional key/value database so it can be a good starting point for people
interested in how databases work.
The best places to start are the main entry points into Bolt:
- `Open()` - Initializes the reference to the database. It's responsible for
creating the database if it doesn't exist, obtaining an exclusive lock on the
file, reading the meta pages, & memory-mapping the file.
- `DB.Begin()` - Starts a read-only or read-write transaction depending on the
value of the `writable` argument. This requires briefly obtaining the "meta"
lock to keep track of open transactions. Only one read-write transaction can
exist at a time so the "rwlock" is acquired during the life of a read-write
transaction.
- `Bucket.Put()` - Writes a key/value pair into a bucket. After validating the
arguments, a cursor is used to traverse the B+tree to the page and position
where they key & value will be written. Once the position is found, the bucket
materializes the underlying page and the page's parent pages into memory as
"nodes". These nodes are where mutations occur during read-write transactions.
These changes get flushed to disk during commit.
- `Bucket.Get()` - Retrieves a key/value pair from a bucket. This uses a cursor
to move to the page & position of a key/value pair. During a read-only
transaction, the key and value data is returned as a direct reference to the
underlying mmap file so there's no allocation overhead. For read-write
transactions, this data may reference the mmap file or one of the in-memory
node values.
- `Cursor` - This object is simply for traversing the B+tree of on-disk pages
or in-memory nodes. It can seek to a specific key, move to the first or last
value, or it can move forward or backward. The cursor handles the movement up
and down the B+tree transparently to the end user.
- `Tx.Commit()` - Converts the in-memory dirty nodes and the list of free pages
into pages to be written to disk. Writing to disk then occurs in two phases.
First, the dirty pages are written to disk and an `fsync()` occurs. Second, a
new meta page with an incremented transaction ID is written and another
`fsync()` occurs. This two phase write ensures that partially written data
pages are ignored in the event of a crash since the meta page pointing to them
is never written. Partially written meta pages are invalidated because they
are written with a checksum.
If you have additional notes that could be helpful for others, please submit
them via pull request.
## Other Projects Using Bolt
Below is a list of public, open source projects that use Bolt:
* [BoltDbWeb](https://github.com/evnix/boltdbweb) - A web based GUI for BoltDB files.
* [Operation Go: A Routine Mission](http://gocode.io) - An online programming game for Golang using Bolt for user accounts and a leaderboard.
* [Bazil](https://bazil.org/) - A file system that lets your data reside where it is most convenient for it to reside.
* [DVID](https://github.com/janelia-flyem/dvid) - Added Bolt as optional storage engine and testing it against Basho-tuned leveldb.
* [Skybox Analytics](https://github.com/skybox/skybox) - A standalone funnel analysis tool for web analytics.
* [Scuttlebutt](https://github.com/benbjohnson/scuttlebutt) - Uses Bolt to store and process all Twitter mentions of GitHub projects.
* [Wiki](https://github.com/peterhellberg/wiki) - A tiny wiki using Goji, BoltDB and Blackfriday.
* [ChainStore](https://github.com/pressly/chainstore) - Simple key-value interface to a variety of storage engines organized as a chain of operations.
* [MetricBase](https://github.com/msiebuhr/MetricBase) - Single-binary version of Graphite.
* [Gitchain](https://github.com/gitchain/gitchain) - Decentralized, peer-to-peer Git repositories aka "Git meets Bitcoin".
* [event-shuttle](https://github.com/sclasen/event-shuttle) - A Unix system service to collect and reliably deliver messages to Kafka.
* [ipxed](https://github.com/kelseyhightower/ipxed) - Web interface and api for ipxed.
* [BoltStore](https://github.com/yosssi/boltstore) - Session store using Bolt.
* [photosite/session](https://godoc.org/bitbucket.org/kardianos/photosite/session) - Sessions for a photo viewing site.
* [LedisDB](https://github.com/siddontang/ledisdb) - A high performance NoSQL, using Bolt as optional storage.
* [ipLocator](https://github.com/AndreasBriese/ipLocator) - A fast ip-geo-location-server using bolt with bloom filters.
* [cayley](https://github.com/google/cayley) - Cayley is an open-source graph database using Bolt as optional backend.
* [bleve](http://www.blevesearch.com/) - A pure Go search engine similar to ElasticSearch that uses Bolt as the default storage backend.
* [tentacool](https://github.com/optiflows/tentacool) - REST api server to manage system stuff (IP, DNS, Gateway...) on a linux server.
* [Seaweed File System](https://github.com/chrislusf/seaweedfs) - Highly scalable distributed key~file system with O(1) disk read.
* [InfluxDB](https://influxdata.com) - Scalable datastore for metrics, events, and real-time analytics.
* [Freehold](http://tshannon.bitbucket.org/freehold/) - An open, secure, and lightweight platform for your files and data.
* [Prometheus Annotation Server](https://github.com/oliver006/prom_annotation_server) - Annotation server for PromDash & Prometheus service monitoring system.
* [Consul](https://github.com/hashicorp/consul) - Consul is service discovery and configuration made easy. Distributed, highly available, and datacenter-aware.
* [Kala](https://github.com/ajvb/kala) - Kala is a modern job scheduler optimized to run on a single node. It is persistent, JSON over HTTP API, ISO 8601 duration notation, and dependent jobs.
* [drive](https://github.com/odeke-em/drive) - drive is an unofficial Google Drive command line client for \*NIX operating systems.
* [stow](https://github.com/djherbis/stow) - a persistence manager for objects
backed by boltdb.
* [buckets](https://github.com/joyrexus/buckets) - a bolt wrapper streamlining
simple tx and key scans.
* [mbuckets](https://github.com/abhigupta912/mbuckets) - A Bolt wrapper that allows easy operations on multi level (nested) buckets.
* [Request Baskets](https://github.com/darklynx/request-baskets) - A web service to collect arbitrary HTTP requests and inspect them via REST API or simple web UI, similar to [RequestBin](http://requestb.in/) service
* [Go Report Card](https://goreportcard.com/) - Go code quality report cards as a (free and open source) service.
* [Boltdb Boilerplate](https://github.com/bobintornado/boltdb-boilerplate) - Boilerplate wrapper around bolt aiming to make simple calls one-liners.
* [lru](https://github.com/crowdriff/lru) - Easy to use Bolt-backed Least-Recently-Used (LRU) read-through cache with chainable remote stores.
* [Storm](https://github.com/asdine/storm) - Simple and powerful ORM for BoltDB.
* [GoWebApp](https://github.com/josephspurrier/gowebapp) - A basic MVC web application in Go using BoltDB.
* [SimpleBolt](https://github.com/xyproto/simplebolt) - A simple way to use BoltDB. Deals mainly with strings.
* [Algernon](https://github.com/xyproto/algernon) - A HTTP/2 web server with built-in support for Lua. Uses BoltDB as the default database backend.
* [MuLiFS](https://github.com/dankomiocevic/mulifs) - Music Library Filesystem creates a filesystem to organise your music files.
* [GoShort](https://github.com/pankajkhairnar/goShort) - GoShort is a URL shortener written in Golang and BoltDB for persistent key/value storage and for routing it's using high performent HTTPRouter.
* [torrent](https://github.com/anacrolix/torrent) - Full-featured BitTorrent client package and utilities in Go. BoltDB is a storage backend in development.
If you are using Bolt in a project please send a pull request to add it to the list.

10
vendor/github.com/boltdb/bolt/bolt_386.go generated vendored
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@ -1,10 +0,0 @@
package bolt
// maxMapSize represents the largest mmap size supported by Bolt.
const maxMapSize = 0x7FFFFFFF // 2GB
// maxAllocSize is the size used when creating array pointers.
const maxAllocSize = 0xFFFFFFF
// Are unaligned load/stores broken on this arch?
var brokenUnaligned = false

10
vendor/github.com/boltdb/bolt/bolt_amd64.go generated vendored
View file

@ -1,10 +0,0 @@
package bolt
// maxMapSize represents the largest mmap size supported by Bolt.
const maxMapSize = 0xFFFFFFFFFFFF // 256TB
// maxAllocSize is the size used when creating array pointers.
const maxAllocSize = 0x7FFFFFFF
// Are unaligned load/stores broken on this arch?
var brokenUnaligned = false

28
vendor/github.com/boltdb/bolt/bolt_arm.go generated vendored
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@ -1,28 +0,0 @@
package bolt
import "unsafe"
// maxMapSize represents the largest mmap size supported by Bolt.
const maxMapSize = 0x7FFFFFFF // 2GB
// maxAllocSize is the size used when creating array pointers.
const maxAllocSize = 0xFFFFFFF
// Are unaligned load/stores broken on this arch?
var brokenUnaligned bool
func init() {
// Simple check to see whether this arch handles unaligned load/stores
// correctly.
// ARM9 and older devices require load/stores to be from/to aligned
// addresses. If not, the lower 2 bits are cleared and that address is
// read in a jumbled up order.
// See http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka15414.html
raw := [6]byte{0xfe, 0xef, 0x11, 0x22, 0x22, 0x11}
val := *(*uint32)(unsafe.Pointer(uintptr(unsafe.Pointer(&raw)) + 2))
brokenUnaligned = val != 0x11222211
}

12
vendor/github.com/boltdb/bolt/bolt_arm64.go generated vendored
View file

@ -1,12 +0,0 @@
// +build arm64
package bolt
// maxMapSize represents the largest mmap size supported by Bolt.
const maxMapSize = 0xFFFFFFFFFFFF // 256TB
// maxAllocSize is the size used when creating array pointers.
const maxAllocSize = 0x7FFFFFFF
// Are unaligned load/stores broken on this arch?
var brokenUnaligned = false

10
vendor/github.com/boltdb/bolt/bolt_linux.go generated vendored
View file

@ -1,10 +0,0 @@
package bolt
import (
"syscall"
)
// fdatasync flushes written data to a file descriptor.
func fdatasync(db *DB) error {
return syscall.Fdatasync(int(db.file.Fd()))
}

27
vendor/github.com/boltdb/bolt/bolt_openbsd.go generated vendored
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@ -1,27 +0,0 @@
package bolt
import (
"syscall"
"unsafe"
)
const (
msAsync = 1 << iota // perform asynchronous writes
msSync // perform synchronous writes
msInvalidate // invalidate cached data
)
func msync(db *DB) error {
_, _, errno := syscall.Syscall(syscall.SYS_MSYNC, uintptr(unsafe.Pointer(db.data)), uintptr(db.datasz), msInvalidate)
if errno != 0 {
return errno
}
return nil
}
func fdatasync(db *DB) error {
if db.data != nil {
return msync(db)
}
return db.file.Sync()
}

9
vendor/github.com/boltdb/bolt/bolt_ppc.go generated vendored
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@ -1,9 +0,0 @@
// +build ppc
package bolt
// maxMapSize represents the largest mmap size supported by Bolt.
const maxMapSize = 0x7FFFFFFF // 2GB
// maxAllocSize is the size used when creating array pointers.
const maxAllocSize = 0xFFFFFFF

9
vendor/github.com/boltdb/bolt/bolt_ppc64.go generated vendored
View file

@ -1,9 +0,0 @@
// +build ppc64
package bolt
// maxMapSize represents the largest mmap size supported by Bolt.
const maxMapSize = 0xFFFFFFFFFFFF // 256TB
// maxAllocSize is the size used when creating array pointers.
const maxAllocSize = 0x7FFFFFFF

12
vendor/github.com/boltdb/bolt/bolt_ppc64le.go generated vendored
View file

@ -1,12 +0,0 @@
// +build ppc64le
package bolt
// maxMapSize represents the largest mmap size supported by Bolt.
const maxMapSize = 0xFFFFFFFFFFFF // 256TB
// maxAllocSize is the size used when creating array pointers.
const maxAllocSize = 0x7FFFFFFF
// Are unaligned load/stores broken on this arch?
var brokenUnaligned = false

12
vendor/github.com/boltdb/bolt/bolt_s390x.go generated vendored
View file

@ -1,12 +0,0 @@
// +build s390x
package bolt
// maxMapSize represents the largest mmap size supported by Bolt.
const maxMapSize = 0xFFFFFFFFFFFF // 256TB
// maxAllocSize is the size used when creating array pointers.
const maxAllocSize = 0x7FFFFFFF
// Are unaligned load/stores broken on this arch?
var brokenUnaligned = false

89
vendor/github.com/boltdb/bolt/bolt_unix.go generated vendored
View file

@ -1,89 +0,0 @@
// +build !windows,!plan9,!solaris
package bolt
import (
"fmt"
"os"
"syscall"
"time"
"unsafe"
)
// flock acquires an advisory lock on a file descriptor.
func flock(db *DB, mode os.FileMode, exclusive bool, timeout time.Duration) error {
var t time.Time
for {
// If we're beyond our timeout then return an error.
// This can only occur after we've attempted a flock once.
if t.IsZero() {
t = time.Now()
} else if timeout > 0 && time.Since(t) > timeout {
return ErrTimeout
}
flag := syscall.LOCK_SH
if exclusive {
flag = syscall.LOCK_EX
}
// Otherwise attempt to obtain an exclusive lock.
err := syscall.Flock(int(db.file.Fd()), flag|syscall.LOCK_NB)
if err == nil {
return nil
} else if err != syscall.EWOULDBLOCK {
return err
}
// Wait for a bit and try again.
time.Sleep(50 * time.Millisecond)
}
}
// funlock releases an advisory lock on a file descriptor.
func funlock(db *DB) error {
return syscall.Flock(int(db.file.Fd()), syscall.LOCK_UN)
}
// mmap memory maps a DB's data file.
func mmap(db *DB, sz int) error {
// Map the data file to memory.
b, err := syscall.Mmap(int(db.file.Fd()), 0, sz, syscall.PROT_READ, syscall.MAP_SHARED|db.MmapFlags)
if err != nil {
return err
}
// Advise the kernel that the mmap is accessed randomly.
if err := madvise(b, syscall.MADV_RANDOM); err != nil {
return fmt.Errorf("madvise: %s", err)
}
// Save the original byte slice and convert to a byte array pointer.
db.dataref = b
db.data = (*[maxMapSize]byte)(unsafe.Pointer(&b[0]))
db.datasz = sz
return nil
}
// munmap unmaps a DB's data file from memory.
func munmap(db *DB) error {
// Ignore the unmap if we have no mapped data.
if db.dataref == nil {
return nil
}
// Unmap using the original byte slice.
err := syscall.Munmap(db.dataref)
db.dataref = nil
db.data = nil
db.datasz = 0
return err
}
// NOTE: This function is copied from stdlib because it is not available on darwin.
func madvise(b []byte, advice int) (err error) {
_, _, e1 := syscall.Syscall(syscall.SYS_MADVISE, uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), uintptr(advice))
if e1 != 0 {
err = e1
}
return
}

90
vendor/github.com/boltdb/bolt/bolt_unix_solaris.go generated vendored
View file

@ -1,90 +0,0 @@
package bolt
import (
"fmt"
"os"
"syscall"
"time"
"unsafe"
"golang.org/x/sys/unix"
)
// flock acquires an advisory lock on a file descriptor.
func flock(db *DB, mode os.FileMode, exclusive bool, timeout time.Duration) error {
var t time.Time
for {
// If we're beyond our timeout then return an error.
// This can only occur after we've attempted a flock once.
if t.IsZero() {
t = time.Now()
} else if timeout > 0 && time.Since(t) > timeout {
return ErrTimeout
}
var lock syscall.Flock_t
lock.Start = 0
lock.Len = 0
lock.Pid = 0
lock.Whence = 0
lock.Pid = 0
if exclusive {
lock.Type = syscall.F_WRLCK
} else {
lock.Type = syscall.F_RDLCK
}
err := syscall.FcntlFlock(db.file.Fd(), syscall.F_SETLK, &lock)
if err == nil {
return nil
} else if err != syscall.EAGAIN {
return err
}
// Wait for a bit and try again.
time.Sleep(50 * time.Millisecond)
}
}
// funlock releases an advisory lock on a file descriptor.
func funlock(db *DB) error {
var lock syscall.Flock_t
lock.Start = 0
lock.Len = 0
lock.Type = syscall.F_UNLCK
lock.Whence = 0
return syscall.FcntlFlock(uintptr(db.file.Fd()), syscall.F_SETLK, &lock)
}
// mmap memory maps a DB's data file.
func mmap(db *DB, sz int) error {
// Map the data file to memory.
b, err := unix.Mmap(int(db.file.Fd()), 0, sz, syscall.PROT_READ, syscall.MAP_SHARED|db.MmapFlags)
if err != nil {
return err
}
// Advise the kernel that the mmap is accessed randomly.
if err := unix.Madvise(b, syscall.MADV_RANDOM); err != nil {
return fmt.Errorf("madvise: %s", err)
}
// Save the original byte slice and convert to a byte array pointer.
db.dataref = b
db.data = (*[maxMapSize]byte)(unsafe.Pointer(&b[0]))
db.datasz = sz
return nil
}
// munmap unmaps a DB's data file from memory.
func munmap(db *DB) error {
// Ignore the unmap if we have no mapped data.
if db.dataref == nil {
return nil
}
// Unmap using the original byte slice.
err := unix.Munmap(db.dataref)
db.dataref = nil
db.data = nil
db.datasz = 0
return err
}

144
vendor/github.com/boltdb/bolt/bolt_windows.go generated vendored
View file

@ -1,144 +0,0 @@
package bolt
import (
"fmt"
"os"
"syscall"
"time"
"unsafe"
)
// LockFileEx code derived from golang build filemutex_windows.go @ v1.5.1
var (
modkernel32 = syscall.NewLazyDLL("kernel32.dll")
procLockFileEx = modkernel32.NewProc("LockFileEx")
procUnlockFileEx = modkernel32.NewProc("UnlockFileEx")
)
const (
lockExt = ".lock"
// see https://msdn.microsoft.com/en-us/library/windows/desktop/aa365203(v=vs.85).aspx
flagLockExclusive = 2
flagLockFailImmediately = 1
// see https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx
errLockViolation syscall.Errno = 0x21
)
func lockFileEx(h syscall.Handle, flags, reserved, locklow, lockhigh uint32, ol *syscall.Overlapped) (err error) {
r, _, err := procLockFileEx.Call(uintptr(h), uintptr(flags), uintptr(reserved), uintptr(locklow), uintptr(lockhigh), uintptr(unsafe.Pointer(ol)))
if r == 0 {
return err
}
return nil
}
func unlockFileEx(h syscall.Handle, reserved, locklow, lockhigh uint32, ol *syscall.Overlapped) (err error) {
r, _, err := procUnlockFileEx.Call(uintptr(h), uintptr(reserved), uintptr(locklow), uintptr(lockhigh), uintptr(unsafe.Pointer(ol)), 0)
if r == 0 {
return err
}
return nil
}
// fdatasync flushes written data to a file descriptor.
func fdatasync(db *DB) error {
return db.file.Sync()
}
// flock acquires an advisory lock on a file descriptor.
func flock(db *DB, mode os.FileMode, exclusive bool, timeout time.Duration) error {
// Create a separate lock file on windows because a process
// cannot share an exclusive lock on the same file. This is
// needed during Tx.WriteTo().
f, err := os.OpenFile(db.path+lockExt, os.O_CREATE, mode)
if err != nil {
return err
}
db.lockfile = f
var t time.Time
for {
// If we're beyond our timeout then return an error.
// This can only occur after we've attempted a flock once.
if t.IsZero() {
t = time.Now()
} else if timeout > 0 && time.Since(t) > timeout {
return ErrTimeout
}
var flag uint32 = flagLockFailImmediately
if exclusive {
flag |= flagLockExclusive
}
err := lockFileEx(syscall.Handle(db.lockfile.Fd()), flag, 0, 1, 0, &syscall.Overlapped{})
if err == nil {
return nil
} else if err != errLockViolation {
return err
}
// Wait for a bit and try again.
time.Sleep(50 * time.Millisecond)
}
}
// funlock releases an advisory lock on a file descriptor.
func funlock(db *DB) error {
err := unlockFileEx(syscall.Handle(db.lockfile.Fd()), 0, 1, 0, &syscall.Overlapped{})
db.lockfile.Close()
os.Remove(db.path+lockExt)
return err
}
// mmap memory maps a DB's data file.
// Based on: https://github.com/edsrzf/mmap-go
func mmap(db *DB, sz int) error {
if !db.readOnly {
// Truncate the database to the size of the mmap.
if err := db.file.Truncate(int64(sz)); err != nil {
return fmt.Errorf("truncate: %s", err)
}
}
// Open a file mapping handle.
sizelo := uint32(sz >> 32)
sizehi := uint32(sz) & 0xffffffff
h, errno := syscall.CreateFileMapping(syscall.Handle(db.file.Fd()), nil, syscall.PAGE_READONLY, sizelo, sizehi, nil)
if h == 0 {
return os.NewSyscallError("CreateFileMapping", errno)
}
// Create the memory map.
addr, errno := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, uintptr(sz))
if addr == 0 {
return os.NewSyscallError("MapViewOfFile", errno)
}
// Close mapping handle.
if err := syscall.CloseHandle(syscall.Handle(h)); err != nil {
return os.NewSyscallError("CloseHandle", err)
}
// Convert to a byte array.
db.data = ((*[maxMapSize]byte)(unsafe.Pointer(addr)))
db.datasz = sz
return nil
}
// munmap unmaps a pointer from a file.
// Based on: https://github.com/edsrzf/mmap-go
func munmap(db *DB) error {
if db.data == nil {
return nil
}
addr := (uintptr)(unsafe.Pointer(&db.data[0]))
if err := syscall.UnmapViewOfFile(addr); err != nil {
return os.NewSyscallError("UnmapViewOfFile", err)
}
return nil
}

8
vendor/github.com/boltdb/bolt/boltsync_unix.go generated vendored
View file

@ -1,8 +0,0 @@
// +build !windows,!plan9,!linux,!openbsd
package bolt
// fdatasync flushes written data to a file descriptor.
func fdatasync(db *DB) error {
return db.file.Sync()
}

778
vendor/github.com/boltdb/bolt/bucket.go generated vendored
View file

@ -1,778 +0,0 @@
package bolt
import (
"bytes"
"fmt"
"unsafe"
)
const (
// MaxKeySize is the maximum length of a key, in bytes.
MaxKeySize = 32768
// MaxValueSize is the maximum length of a value, in bytes.
MaxValueSize = (1 << 31) - 2
)
const (
maxUint = ^uint(0)
minUint = 0
maxInt = int(^uint(0) >> 1)
minInt = -maxInt - 1
)
const bucketHeaderSize = int(unsafe.Sizeof(bucket{}))
const (
minFillPercent = 0.1
maxFillPercent = 1.0
)
// DefaultFillPercent is the percentage that split pages are filled.
// This value can be changed by setting Bucket.FillPercent.
const DefaultFillPercent = 0.5
// Bucket represents a collection of key/value pairs inside the database.
type Bucket struct {
*bucket
tx *Tx // the associated transaction
buckets map[string]*Bucket // subbucket cache
page *page // inline page reference
rootNode *node // materialized node for the root page.
nodes map[pgid]*node // node cache
// Sets the threshold for filling nodes when they split. By default,
// the bucket will fill to 50% but it can be useful to increase this
// amount if you know that your write workloads are mostly append-only.
//
// This is non-persisted across transactions so it must be set in every Tx.
FillPercent float64
}
// bucket represents the on-file representation of a bucket.
// This is stored as the "value" of a bucket key. If the bucket is small enough,
// then its root page can be stored inline in the "value", after the bucket
// header. In the case of inline buckets, the "root" will be 0.
type bucket struct {
root pgid // page id of the bucket's root-level page
sequence uint64 // monotonically incrementing, used by NextSequence()
}
// newBucket returns a new bucket associated with a transaction.
func newBucket(tx *Tx) Bucket {
var b = Bucket{tx: tx, FillPercent: DefaultFillPercent}
if tx.writable {
b.buckets = make(map[string]*Bucket)
b.nodes = make(map[pgid]*node)
}
return b
}
// Tx returns the tx of the bucket.
func (b *Bucket) Tx() *Tx {
return b.tx
}
// Root returns the root of the bucket.
func (b *Bucket) Root() pgid {
return b.root
}
// Writable returns whether the bucket is writable.
func (b *Bucket) Writable() bool {
return b.tx.writable
}
// Cursor creates a cursor associated with the bucket.
// The cursor is only valid as long as the transaction is open.
// Do not use a cursor after the transaction is closed.
func (b *Bucket) Cursor() *Cursor {
// Update transaction statistics.
b.tx.stats.CursorCount++
// Allocate and return a cursor.
return &Cursor{
bucket: b,
stack: make([]elemRef, 0),
}
}
// Bucket retrieves a nested bucket by name.
// Returns nil if the bucket does not exist.
// The bucket instance is only valid for the lifetime of the transaction.
func (b *Bucket) Bucket(name []byte) *Bucket {
if b.buckets != nil {
if child := b.buckets[string(name)]; child != nil {
return child
}
}
// Move cursor to key.
c := b.Cursor()
k, v, flags := c.seek(name)
// Return nil if the key doesn't exist or it is not a bucket.
if !bytes.Equal(name, k) || (flags&bucketLeafFlag) == 0 {
return nil
}
// Otherwise create a bucket and cache it.
var child = b.openBucket(v)
if b.buckets != nil {
b.buckets[string(name)] = child
}
return child
}
// Helper method that re-interprets a sub-bucket value
// from a parent into a Bucket
func (b *Bucket) openBucket(value []byte) *Bucket {
var child = newBucket(b.tx)
// If unaligned load/stores are broken on this arch and value is
// unaligned simply clone to an aligned byte array.
unaligned := brokenUnaligned && uintptr(unsafe.Pointer(&value[0]))&3 != 0
if unaligned {
value = cloneBytes(value)
}
// If this is a writable transaction then we need to copy the bucket entry.
// Read-only transactions can point directly at the mmap entry.
if b.tx.writable && !unaligned {
child.bucket = &bucket{}
*child.bucket = *(*bucket)(unsafe.Pointer(&value[0]))
} else {
child.bucket = (*bucket)(unsafe.Pointer(&value[0]))
}
// Save a reference to the inline page if the bucket is inline.
if child.root == 0 {
child.page = (*page)(unsafe.Pointer(&value[bucketHeaderSize]))
}
return &child
}
// CreateBucket creates a new bucket at the given key and returns the new bucket.
// Returns an error if the key already exists, if the bucket name is blank, or if the bucket name is too long.
// The bucket instance is only valid for the lifetime of the transaction.
func (b *Bucket) CreateBucket(key []byte) (*Bucket, error) {
if b.tx.db == nil {
return nil, ErrTxClosed
} else if !b.tx.writable {
return nil, ErrTxNotWritable
} else if len(key) == 0 {
return nil, ErrBucketNameRequired
}
// Move cursor to correct position.
c := b.Cursor()
k, _, flags := c.seek(key)
// Return an error if there is an existing key.
if bytes.Equal(key, k) {
if (flags & bucketLeafFlag) != 0 {
return nil, ErrBucketExists
} else {
return nil, ErrIncompatibleValue
}
}
// Create empty, inline bucket.
var bucket = Bucket{
bucket: &bucket{},
rootNode: &node{isLeaf: true},
FillPercent: DefaultFillPercent,
}
var value = bucket.write()
// Insert into node.
key = cloneBytes(key)
c.node().put(key, key, value, 0, bucketLeafFlag)
// Since subbuckets are not allowed on inline buckets, we need to
// dereference the inline page, if it exists. This will cause the bucket
// to be treated as a regular, non-inline bucket for the rest of the tx.
b.page = nil
return b.Bucket(key), nil
}
// CreateBucketIfNotExists creates a new bucket if it doesn't already exist and returns a reference to it.
// Returns an error if the bucket name is blank, or if the bucket name is too long.
// The bucket instance is only valid for the lifetime of the transaction.
func (b *Bucket) CreateBucketIfNotExists(key []byte) (*Bucket, error) {
child, err := b.CreateBucket(key)
if err == ErrBucketExists {
return b.Bucket(key), nil
} else if err != nil {
return nil, err
}
return child, nil
}
// DeleteBucket deletes a bucket at the given key.
// Returns an error if the bucket does not exists, or if the key represents a non-bucket value.
func (b *Bucket) DeleteBucket(key []byte) error {
if b.tx.db == nil {
return ErrTxClosed
} else if !b.Writable() {
return ErrTxNotWritable
}
// Move cursor to correct position.
c := b.Cursor()
k, _, flags := c.seek(key)
// Return an error if bucket doesn't exist or is not a bucket.
if !bytes.Equal(key, k) {
return ErrBucketNotFound
} else if (flags & bucketLeafFlag) == 0 {
return ErrIncompatibleValue
}
// Recursively delete all child buckets.
child := b.Bucket(key)
err := child.ForEach(func(k, v []byte) error {
if v == nil {
if err := child.DeleteBucket(k); err != nil {
return fmt.Errorf("delete bucket: %s", err)
}
}
return nil
})
if err != nil {
return err
}
// Remove cached copy.
delete(b.buckets, string(key))
// Release all bucket pages to freelist.
child.nodes = nil
child.rootNode = nil
child.free()
// Delete the node if we have a matching key.
c.node().del(key)
return nil
}
// Get retrieves the value for a key in the bucket.
// Returns a nil value if the key does not exist or if the key is a nested bucket.
// The returned value is only valid for the life of the transaction.
func (b *Bucket) Get(key []byte) []byte {
k, v, flags := b.Cursor().seek(key)
// Return nil if this is a bucket.
if (flags & bucketLeafFlag) != 0 {
return nil
}
// If our target node isn't the same key as what's passed in then return nil.
if !bytes.Equal(key, k) {
return nil
}
return v
}
// Put sets the value for a key in the bucket.
// If the key exist then its previous value will be overwritten.
// Supplied value must remain valid for the life of the transaction.
// Returns an error if the bucket was created from a read-only transaction, if the key is blank, if the key is too large, or if the value is too large.
func (b *Bucket) Put(key []byte, value []byte) error {
if b.tx.db == nil {
return ErrTxClosed
} else if !b.Writable() {
return ErrTxNotWritable
} else if len(key) == 0 {
return ErrKeyRequired
} else if len(key) > MaxKeySize {
return ErrKeyTooLarge
} else if int64(len(value)) > MaxValueSize {
return ErrValueTooLarge
}
// Move cursor to correct position.
c := b.Cursor()
k, _, flags := c.seek(key)
// Return an error if there is an existing key with a bucket value.
if bytes.Equal(key, k) && (flags&bucketLeafFlag) != 0 {
return ErrIncompatibleValue
}
// Insert into node.
key = cloneBytes(key)
c.node().put(key, key, value, 0, 0)
return nil
}
// Delete removes a key from the bucket.
// If the key does not exist then nothing is done and a nil error is returned.
// Returns an error if the bucket was created from a read-only transaction.
func (b *Bucket) Delete(key []byte) error {
if b.tx.db == nil {
return ErrTxClosed
} else if !b.Writable() {
return ErrTxNotWritable
}
// Move cursor to correct position.
c := b.Cursor()
_, _, flags := c.seek(key)
// Return an error if there is already existing bucket value.
if (flags & bucketLeafFlag) != 0 {
return ErrIncompatibleValue
}
// Delete the node if we have a matching key.
c.node().del(key)
return nil
}
// Sequence returns the current integer for the bucket without incrementing it.
func (b *Bucket) Sequence() uint64 { return b.bucket.sequence }
// SetSequence updates the sequence number for the bucket.
func (b *Bucket) SetSequence(v uint64) error {
if b.tx.db == nil {
return ErrTxClosed
} else if !b.Writable() {
return ErrTxNotWritable
}
// Materialize the root node if it hasn't been already so that the
// bucket will be saved during commit.
if b.rootNode == nil {
_ = b.node(b.root, nil)
}
// Increment and return the sequence.
b.bucket.sequence = v
return nil
}
// NextSequence returns an autoincrementing integer for the bucket.
func (b *Bucket) NextSequence() (uint64, error) {
if b.tx.db == nil {
return 0, ErrTxClosed
} else if !b.Writable() {
return 0, ErrTxNotWritable
}
// Materialize the root node if it hasn't been already so that the
// bucket will be saved during commit.
if b.rootNode == nil {
_ = b.node(b.root, nil)
}
// Increment and return the sequence.
b.bucket.sequence++
return b.bucket.sequence, nil
}
// ForEach executes a function for each key/value pair in a bucket.
// If the provided function returns an error then the iteration is stopped and
// the error is returned to the caller. The provided function must not modify
// the bucket; this will result in undefined behavior.
func (b *Bucket) ForEach(fn func(k, v []byte) error) error {
if b.tx.db == nil {
return ErrTxClosed
}
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
if err := fn(k, v); err != nil {
return err
}
}
return nil
}
// Stat returns stats on a bucket.
func (b *Bucket) Stats() BucketStats {
var s, subStats BucketStats
pageSize := b.tx.db.pageSize
s.BucketN += 1
if b.root == 0 {
s.InlineBucketN += 1
}
b.forEachPage(func(p *page, depth int) {
if (p.flags & leafPageFlag) != 0 {
s.KeyN += int(p.count)
// used totals the used bytes for the page
used := pageHeaderSize
if p.count != 0 {
// If page has any elements, add all element headers.
used += leafPageElementSize * int(p.count-1)
// Add all element key, value sizes.
// The computation takes advantage of the fact that the position
// of the last element's key/value equals to the total of the sizes
// of all previous elements' keys and values.
// It also includes the last element's header.
lastElement := p.leafPageElement(p.count - 1)
used += int(lastElement.pos + lastElement.ksize + lastElement.vsize)
}
if b.root == 0 {
// For inlined bucket just update the inline stats
s.InlineBucketInuse += used
} else {
// For non-inlined bucket update all the leaf stats
s.LeafPageN++
s.LeafInuse += used
s.LeafOverflowN += int(p.overflow)
// Collect stats from sub-buckets.
// Do that by iterating over all element headers
// looking for the ones with the bucketLeafFlag.
for i := uint16(0); i < p.count; i++ {
e := p.leafPageElement(i)
if (e.flags & bucketLeafFlag) != 0 {
// For any bucket element, open the element value
// and recursively call Stats on the contained bucket.
subStats.Add(b.openBucket(e.value()).Stats())
}
}
}
} else if (p.flags & branchPageFlag) != 0 {
s.BranchPageN++
lastElement := p.branchPageElement(p.count - 1)
// used totals the used bytes for the page
// Add header and all element headers.
used := pageHeaderSize + (branchPageElementSize * int(p.count-1))
// Add size of all keys and values.
// Again, use the fact that last element's position equals to
// the total of key, value sizes of all previous elements.
used += int(lastElement.pos + lastElement.ksize)
s.BranchInuse += used
s.BranchOverflowN += int(p.overflow)
}
// Keep track of maximum page depth.
if depth+1 > s.Depth {
s.Depth = (depth + 1)
}
})
// Alloc stats can be computed from page counts and pageSize.
s.BranchAlloc = (s.BranchPageN + s.BranchOverflowN) * pageSize
s.LeafAlloc = (s.LeafPageN + s.LeafOverflowN) * pageSize
// Add the max depth of sub-buckets to get total nested depth.
s.Depth += subStats.Depth
// Add the stats for all sub-buckets
s.Add(subStats)
return s
}
// forEachPage iterates over every page in a bucket, including inline pages.
func (b *Bucket) forEachPage(fn func(*page, int)) {
// If we have an inline page then just use that.
if b.page != nil {
fn(b.page, 0)
return
}
// Otherwise traverse the page hierarchy.
b.tx.forEachPage(b.root, 0, fn)
}
// forEachPageNode iterates over every page (or node) in a bucket.
// This also includes inline pages.
func (b *Bucket) forEachPageNode(fn func(*page, *node, int)) {
// If we have an inline page or root node then just use that.
if b.page != nil {
fn(b.page, nil, 0)
return
}
b._forEachPageNode(b.root, 0, fn)
}
func (b *Bucket) _forEachPageNode(pgid pgid, depth int, fn func(*page, *node, int)) {
var p, n = b.pageNode(pgid)
// Execute function.
fn(p, n, depth)
// Recursively loop over children.
if p != nil {
if (p.flags & branchPageFlag) != 0 {
for i := 0; i < int(p.count); i++ {
elem := p.branchPageElement(uint16(i))
b._forEachPageNode(elem.pgid, depth+1, fn)
}
}
} else {
if !n.isLeaf {
for _, inode := range n.inodes {
b._forEachPageNode(inode.pgid, depth+1, fn)
}
}
}
}
// spill writes all the nodes for this bucket to dirty pages.
func (b *Bucket) spill() error {
// Spill all child buckets first.
for name, child := range b.buckets {
// If the child bucket is small enough and it has no child buckets then
// write it inline into the parent bucket's page. Otherwise spill it
// like a normal bucket and make the parent value a pointer to the page.
var value []byte
if child.inlineable() {
child.free()
value = child.write()
} else {
if err := child.spill(); err != nil {
return err
}
// Update the child bucket header in this bucket.
value = make([]byte, unsafe.Sizeof(bucket{}))
var bucket = (*bucket)(unsafe.Pointer(&value[0]))
*bucket = *child.bucket
}
// Skip writing the bucket if there are no materialized nodes.
if child.rootNode == nil {
continue
}
// Update parent node.
var c = b.Cursor()
k, _, flags := c.seek([]byte(name))
if !bytes.Equal([]byte(name), k) {
panic(fmt.Sprintf("misplaced bucket header: %x -> %x", []byte(name), k))
}
if flags&bucketLeafFlag == 0 {
panic(fmt.Sprintf("unexpected bucket header flag: %x", flags))
}
c.node().put([]byte(name), []byte(name), value, 0, bucketLeafFlag)
}
// Ignore if there's not a materialized root node.
if b.rootNode == nil {
return nil
}
// Spill nodes.
if err := b.rootNode.spill(); err != nil {
return err
}
b.rootNode = b.rootNode.root()
// Update the root node for this bucket.
if b.rootNode.pgid >= b.tx.meta.pgid {
panic(fmt.Sprintf("pgid (%d) above high water mark (%d)", b.rootNode.pgid, b.tx.meta.pgid))
}
b.root = b.rootNode.pgid
return nil
}
// inlineable returns true if a bucket is small enough to be written inline
// and if it contains no subbuckets. Otherwise returns false.
func (b *Bucket) inlineable() bool {
var n = b.rootNode
// Bucket must only contain a single leaf node.
if n == nil || !n.isLeaf {
return false
}
// Bucket is not inlineable if it contains subbuckets or if it goes beyond
// our threshold for inline bucket size.
var size = pageHeaderSize
for _, inode := range n.inodes {
size += leafPageElementSize + len(inode.key) + len(inode.value)
if inode.flags&bucketLeafFlag != 0 {
return false
} else if size > b.maxInlineBucketSize() {
return false
}
}
return true
}
// Returns the maximum total size of a bucket to make it a candidate for inlining.
func (b *Bucket) maxInlineBucketSize() int {
return b.tx.db.pageSize / 4
}
// write allocates and writes a bucket to a byte slice.
func (b *Bucket) write() []byte {
// Allocate the appropriate size.
var n = b.rootNode
var value = make([]byte, bucketHeaderSize+n.size())
// Write a bucket header.
var bucket = (*bucket)(unsafe.Pointer(&value[0]))
*bucket = *b.bucket
// Convert byte slice to a fake page and write the root node.
var p = (*page)(unsafe.Pointer(&value[bucketHeaderSize]))
n.write(p)
return value
}
// rebalance attempts to balance all nodes.
func (b *Bucket) rebalance() {
for _, n := range b.nodes {
n.rebalance()
}
for _, child := range b.buckets {
child.rebalance()
}
}
// node creates a node from a page and associates it with a given parent.
func (b *Bucket) node(pgid pgid, parent *node) *node {
_assert(b.nodes != nil, "nodes map expected")
// Retrieve node if it's already been created.
if n := b.nodes[pgid]; n != nil {
return n
}
// Otherwise create a node and cache it.
n := &node{bucket: b, parent: parent}
if parent == nil {
b.rootNode = n
} else {
parent.children = append(parent.children, n)
}
// Use the inline page if this is an inline bucket.
var p = b.page
if p == nil {
p = b.tx.page(pgid)
}
// Read the page into the node and cache it.
n.read(p)
b.nodes[pgid] = n
// Update statistics.
b.tx.stats.NodeCount++
return n
}
// free recursively frees all pages in the bucket.
func (b *Bucket) free() {
if b.root == 0 {
return
}
var tx = b.tx
b.forEachPageNode(func(p *page, n *node, _ int) {
if p != nil {
tx.db.freelist.free(tx.meta.txid, p)
} else {
n.free()
}
})
b.root = 0
}
// dereference removes all references to the old mmap.
func (b *Bucket) dereference() {
if b.rootNode != nil {
b.rootNode.root().dereference()
}
for _, child := range b.buckets {
child.dereference()
}
}
// pageNode returns the in-memory node, if it exists.
// Otherwise returns the underlying page.
func (b *Bucket) pageNode(id pgid) (*page, *node) {
// Inline buckets have a fake page embedded in their value so treat them
// differently. We'll return the rootNode (if available) or the fake page.
if b.root == 0 {
if id != 0 {
panic(fmt.Sprintf("inline bucket non-zero page access(2): %d != 0", id))
}
if b.rootNode != nil {
return nil, b.rootNode
}
return b.page, nil
}
// Check the node cache for non-inline buckets.
if b.nodes != nil {
if n := b.nodes[id]; n != nil {
return nil, n
}
}
// Finally lookup the page from the transaction if no node is materialized.
return b.tx.page(id), nil
}
// BucketStats records statistics about resources used by a bucket.
type BucketStats struct {
// Page count statistics.
BranchPageN int // number of logical branch pages
BranchOverflowN int // number of physical branch overflow pages
LeafPageN int // number of logical leaf pages
LeafOverflowN int // number of physical leaf overflow pages
// Tree statistics.
KeyN int // number of keys/value pairs
Depth int // number of levels in B+tree
// Page size utilization.
BranchAlloc int // bytes allocated for physical branch pages
BranchInuse int // bytes actually used for branch data
LeafAlloc int // bytes allocated for physical leaf pages
LeafInuse int // bytes actually used for leaf data
// Bucket statistics
BucketN int // total number of buckets including the top bucket
InlineBucketN int // total number on inlined buckets
InlineBucketInuse int // bytes used for inlined buckets (also accounted for in LeafInuse)
}
func (s *BucketStats) Add(other BucketStats) {
s.BranchPageN += other.BranchPageN
s.BranchOverflowN += other.BranchOverflowN
s.LeafPageN += other.LeafPageN
s.LeafOverflowN += other.LeafOverflowN
s.KeyN += other.KeyN
if s.Depth < other.Depth {
s.Depth = other.Depth
}
s.BranchAlloc += other.BranchAlloc
s.BranchInuse += other.BranchInuse
s.LeafAlloc += other.LeafAlloc
s.LeafInuse += other.LeafInuse
s.BucketN += other.BucketN
s.InlineBucketN += other.InlineBucketN
s.InlineBucketInuse += other.InlineBucketInuse
}
// cloneBytes returns a copy of a given slice.
func cloneBytes(v []byte) []byte {
var clone = make([]byte, len(v))
copy(clone, v)
return clone
}

400
vendor/github.com/boltdb/bolt/cursor.go generated vendored
View file

@ -1,400 +0,0 @@
package bolt
import (
"bytes"
"fmt"
"sort"
)
// Cursor represents an iterator that can traverse over all key/value pairs in a bucket in sorted order.
// Cursors see nested buckets with value == nil.
// Cursors can be obtained from a transaction and are valid as long as the transaction is open.
//
// Keys and values returned from the cursor are only valid for the life of the transaction.
//
// Changing data while traversing with a cursor may cause it to be invalidated
// and return unexpected keys and/or values. You must reposition your cursor
// after mutating data.
type Cursor struct {
bucket *Bucket
stack []elemRef
}
// Bucket returns the bucket that this cursor was created from.
func (c *Cursor) Bucket() *Bucket {
return c.bucket
}
// First moves the cursor to the first item in the bucket and returns its key and value.
// If the bucket is empty then a nil key and value are returned.
// The returned key and value are only valid for the life of the transaction.
func (c *Cursor) First() (key []byte, value []byte) {
_assert(c.bucket.tx.db != nil, "tx closed")
c.stack = c.stack[:0]
p, n := c.bucket.pageNode(c.bucket.root)
c.stack = append(c.stack, elemRef{page: p, node: n, index: 0})
c.first()
// If we land on an empty page then move to the next value.
// https://github.com/boltdb/bolt/issues/450
if c.stack[len(c.stack)-1].count() == 0 {
c.next()
}
k, v, flags := c.keyValue()
if (flags & uint32(bucketLeafFlag)) != 0 {
return k, nil
}
return k, v
}
// Last moves the cursor to the last item in the bucket and returns its key and value.
// If the bucket is empty then a nil key and value are returned.
// The returned key and value are only valid for the life of the transaction.
func (c *Cursor) Last() (key []byte, value []byte) {
_assert(c.bucket.tx.db != nil, "tx closed")
c.stack = c.stack[:0]
p, n := c.bucket.pageNode(c.bucket.root)
ref := elemRef{page: p, node: n}
ref.index = ref.count() - 1
c.stack = append(c.stack, ref)
c.last()
k, v, flags := c.keyValue()
if (flags & uint32(bucketLeafFlag)) != 0 {
return k, nil
}
return k, v
}
// Next moves the cursor to the next item in the bucket and returns its key and value.
// If the cursor is at the end of the bucket then a nil key and value are returned.
// The returned key and value are only valid for the life of the transaction.
func (c *Cursor) Next() (key []byte, value []byte) {
_assert(c.bucket.tx.db != nil, "tx closed")
k, v, flags := c.next()
if (flags & uint32(bucketLeafFlag)) != 0 {
return k, nil
}
return k, v
}
// Prev moves the cursor to the previous item in the bucket and returns its key and value.
// If the cursor is at the beginning of the bucket then a nil key and value are returned.
// The returned key and value are only valid for the life of the transaction.
func (c *Cursor) Prev() (key []byte, value []byte) {
_assert(c.bucket.tx.db != nil, "tx closed")
// Attempt to move back one element until we're successful.
// Move up the stack as we hit the beginning of each page in our stack.
for i := len(c.stack) - 1; i >= 0; i-- {
elem := &c.stack[i]
if elem.index > 0 {
elem.index--
break
}
c.stack = c.stack[:i]
}
// If we've hit the end then return nil.
if len(c.stack) == 0 {
return nil, nil
}
// Move down the stack to find the last element of the last leaf under this branch.
c.last()
k, v, flags := c.keyValue()
if (flags & uint32(bucketLeafFlag)) != 0 {
return k, nil
}
return k, v
}
// Seek moves the cursor to a given key and returns it.
// If the key does not exist then the next key is used. If no keys
// follow, a nil key is returned.
// The returned key and value are only valid for the life of the transaction.
func (c *Cursor) Seek(seek []byte) (key []byte, value []byte) {
k, v, flags := c.seek(seek)
// If we ended up after the last element of a page then move to the next one.
if ref := &c.stack[len(c.stack)-1]; ref.index >= ref.count() {
k, v, flags = c.next()
}
if k == nil {
return nil, nil
} else if (flags & uint32(bucketLeafFlag)) != 0 {
return k, nil
}
return k, v
}
// Delete removes the current key/value under the cursor from the bucket.
// Delete fails if current key/value is a bucket or if the transaction is not writable.
func (c *Cursor) Delete() error {
if c.bucket.tx.db == nil {
return ErrTxClosed
} else if !c.bucket.Writable() {
return ErrTxNotWritable
}
key, _, flags := c.keyValue()
// Return an error if current value is a bucket.
if (flags & bucketLeafFlag) != 0 {
return ErrIncompatibleValue
}
c.node().del(key)
return nil
}
// seek moves the cursor to a given key and returns it.
// If the key does not exist then the next key is used.
func (c *Cursor) seek(seek []byte) (key []byte, value []byte, flags uint32) {
_assert(c.bucket.tx.db != nil, "tx closed")
// Start from root page/node and traverse to correct page.
c.stack = c.stack[:0]
c.search(seek, c.bucket.root)
ref := &c.stack[len(c.stack)-1]
// If the cursor is pointing to the end of page/node then return nil.
if ref.index >= ref.count() {
return nil, nil, 0
}
// If this is a bucket then return a nil value.
return c.keyValue()
}
// first moves the cursor to the first leaf element under the last page in the stack.
func (c *Cursor) first() {
for {
// Exit when we hit a leaf page.
var ref = &c.stack[len(c.stack)-1]
if ref.isLeaf() {
break
}
// Keep adding pages pointing to the first element to the stack.
var pgid pgid
if ref.node != nil {
pgid = ref.node.inodes[ref.index].pgid
} else {
pgid = ref.page.branchPageElement(uint16(ref.index)).pgid
}
p, n := c.bucket.pageNode(pgid)
c.stack = append(c.stack, elemRef{page: p, node: n, index: 0})
}
}
// last moves the cursor to the last leaf element under the last page in the stack.
func (c *Cursor) last() {
for {
// Exit when we hit a leaf page.
ref := &c.stack[len(c.stack)-1]
if ref.isLeaf() {
break
}
// Keep adding pages pointing to the last element in the stack.
var pgid pgid
if ref.node != nil {
pgid = ref.node.inodes[ref.index].pgid
} else {
pgid = ref.page.branchPageElement(uint16(ref.index)).pgid
}
p, n := c.bucket.pageNode(pgid)
var nextRef = elemRef{page: p, node: n}
nextRef.index = nextRef.count() - 1
c.stack = append(c.stack, nextRef)
}
}
// next moves to the next leaf element and returns the key and value.
// If the cursor is at the last leaf element then it stays there and returns nil.
func (c *Cursor) next() (key []byte, value []byte, flags uint32) {
for {
// Attempt to move over one element until we're successful.
// Move up the stack as we hit the end of each page in our stack.
var i int
for i = len(c.stack) - 1; i >= 0; i-- {
elem := &c.stack[i]
if elem.index < elem.count()-1 {
elem.index++
break
}
}
// If we've hit the root page then stop and return. This will leave the
// cursor on the last element of the last page.
if i == -1 {
return nil, nil, 0
}
// Otherwise start from where we left off in the stack and find the
// first element of the first leaf page.
c.stack = c.stack[:i+1]
c.first()
// If this is an empty page then restart and move back up the stack.
// https://github.com/boltdb/bolt/issues/450
if c.stack[len(c.stack)-1].count() == 0 {
continue
}
return c.keyValue()
}
}
// search recursively performs a binary search against a given page/node until it finds a given key.
func (c *Cursor) search(key []byte, pgid pgid) {
p, n := c.bucket.pageNode(pgid)
if p != nil && (p.flags&(branchPageFlag|leafPageFlag)) == 0 {
panic(fmt.Sprintf("invalid page type: %d: %x", p.id, p.flags))
}
e := elemRef{page: p, node: n}
c.stack = append(c.stack, e)
// If we're on a leaf page/node then find the specific node.
if e.isLeaf() {
c.nsearch(key)
return
}
if n != nil {
c.searchNode(key, n)
return
}
c.searchPage(key, p)
}
func (c *Cursor) searchNode(key []byte, n *node) {
var exact bool
index := sort.Search(len(n.inodes), func(i int) bool {
// TODO(benbjohnson): Optimize this range search. It's a bit hacky right now.
// sort.Search() finds the lowest index where f() != -1 but we need the highest index.
ret := bytes.Compare(n.inodes[i].key, key)
if ret == 0 {
exact = true
}
return ret != -1
})
if !exact && index > 0 {
index--
}
c.stack[len(c.stack)-1].index = index
// Recursively search to the next page.
c.search(key, n.inodes[index].pgid)
}
func (c *Cursor) searchPage(key []byte, p *page) {
// Binary search for the correct range.
inodes := p.branchPageElements()
var exact bool
index := sort.Search(int(p.count), func(i int) bool {
// TODO(benbjohnson): Optimize this range search. It's a bit hacky right now.
// sort.Search() finds the lowest index where f() != -1 but we need the highest index.
ret := bytes.Compare(inodes[i].key(), key)
if ret == 0 {
exact = true
}
return ret != -1
})
if !exact && index > 0 {
index--
}
c.stack[len(c.stack)-1].index = index
// Recursively search to the next page.
c.search(key, inodes[index].pgid)
}
// nsearch searches the leaf node on the top of the stack for a key.
func (c *Cursor) nsearch(key []byte) {
e := &c.stack[len(c.stack)-1]
p, n := e.page, e.node
// If we have a node then search its inodes.
if n != nil {
index := sort.Search(len(n.inodes), func(i int) bool {
return bytes.Compare(n.inodes[i].key, key) != -1
})
e.index = index
return
}
// If we have a page then search its leaf elements.
inodes := p.leafPageElements()
index := sort.Search(int(p.count), func(i int) bool {
return bytes.Compare(inodes[i].key(), key) != -1
})
e.index = index
}
// keyValue returns the key and value of the current leaf element.
func (c *Cursor) keyValue() ([]byte, []byte, uint32) {
ref := &c.stack[len(c.stack)-1]
if ref.count() == 0 || ref.index >= ref.count() {
return nil, nil, 0
}
// Retrieve value from node.
if ref.node != nil {
inode := &ref.node.inodes[ref.index]
return inode.key, inode.value, inode.flags
}
// Or retrieve value from page.
elem := ref.page.leafPageElement(uint16(ref.index))
return elem.key(), elem.value(), elem.flags
}
// node returns the node that the cursor is currently positioned on.
func (c *Cursor) node() *node {
_assert(len(c.stack) > 0, "accessing a node with a zero-length cursor stack")
// If the top of the stack is a leaf node then just return it.
if ref := &c.stack[len(c.stack)-1]; ref.node != nil && ref.isLeaf() {
return ref.node
}
// Start from root and traverse down the hierarchy.
var n = c.stack[0].node
if n == nil {
n = c.bucket.node(c.stack[0].page.id, nil)
}
for _, ref := range c.stack[:len(c.stack)-1] {
_assert(!n.isLeaf, "expected branch node")
n = n.childAt(int(ref.index))
}
_assert(n.isLeaf, "expected leaf node")
return n
}
// elemRef represents a reference to an element on a given page/node.
type elemRef struct {
page *page
node *node
index int
}
// isLeaf returns whether the ref is pointing at a leaf page/node.
func (r *elemRef) isLeaf() bool {
if r.node != nil {
return r.node.isLeaf
}
return (r.page.flags & leafPageFlag) != 0
}
// count returns the number of inodes or page elements.
func (r *elemRef) count() int {
if r.node != nil {
return len(r.node.inodes)
}
return int(r.page.count)
}

1036
vendor/github.com/boltdb/bolt/db.go generated vendored
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44
vendor/github.com/boltdb/bolt/doc.go generated vendored
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@ -1,44 +0,0 @@
/*
Package bolt implements a low-level key/value store in pure Go. It supports
fully serializable transactions, ACID semantics, and lock-free MVCC with
multiple readers and a single writer. Bolt can be used for projects that
want a simple data store without the need to add large dependencies such as
Postgres or MySQL.
Bolt is a single-level, zero-copy, B+tree data store. This means that Bolt is
optimized for fast read access and does not require recovery in the event of a
system crash. Transactions which have not finished committing will simply be
rolled back in the event of a crash.
The design of Bolt is based on Howard Chu's LMDB database project.
Bolt currently works on Windows, Mac OS X, and Linux.
Basics
There are only a few types in Bolt: DB, Bucket, Tx, and Cursor. The DB is
a collection of buckets and is represented by a single file on disk. A bucket is
a collection of unique keys that are associated with values.
Transactions provide either read-only or read-write access to the database.
Read-only transactions can retrieve key/value pairs and can use Cursors to
iterate over the dataset sequentially. Read-write transactions can create and
delete buckets and can insert and remove keys. Only one read-write transaction
is allowed at a time.
Caveats
The database uses a read-only, memory-mapped data file to ensure that
applications cannot corrupt the database, however, this means that keys and
values returned from Bolt cannot be changed. Writing to a read-only byte slice
will cause Go to panic.
Keys and values retrieved from the database are only valid for the life of
the transaction. When used outside the transaction, these byte slices can
point to different data or can point to invalid memory which will cause a panic.
*/
package bolt

71
vendor/github.com/boltdb/bolt/errors.go generated vendored
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@ -1,71 +0,0 @@
package bolt
import "errors"
// These errors can be returned when opening or calling methods on a DB.
var (
// ErrDatabaseNotOpen is returned when a DB instance is accessed before it
// is opened or after it is closed.
ErrDatabaseNotOpen = errors.New("database not open")
// ErrDatabaseOpen is returned when opening a database that is
// already open.
ErrDatabaseOpen = errors.New("database already open")
// ErrInvalid is returned when both meta pages on a database are invalid.
// This typically occurs when a file is not a bolt database.
ErrInvalid = errors.New("invalid database")
// ErrVersionMismatch is returned when the data file was created with a
// different version of Bolt.
ErrVersionMismatch = errors.New("version mismatch")
// ErrChecksum is returned when either meta page checksum does not match.
ErrChecksum = errors.New("checksum error")
// ErrTimeout is returned when a database cannot obtain an exclusive lock
// on the data file after the timeout passed to Open().
ErrTimeout = errors.New("timeout")
)
// These errors can occur when beginning or committing a Tx.
var (
// ErrTxNotWritable is returned when performing a write operation on a
// read-only transaction.
ErrTxNotWritable = errors.New("tx not writable")
// ErrTxClosed is returned when committing or rolling back a transaction
// that has already been committed or rolled back.
ErrTxClosed = errors.New("tx closed")
// ErrDatabaseReadOnly is returned when a mutating transaction is started on a
// read-only database.
ErrDatabaseReadOnly = errors.New("database is in read-only mode")
)
// These errors can occur when putting or deleting a value or a bucket.
var (
// ErrBucketNotFound is returned when trying to access a bucket that has
// not been created yet.
ErrBucketNotFound = errors.New("bucket not found")
// ErrBucketExists is returned when creating a bucket that already exists.
ErrBucketExists = errors.New("bucket already exists")
// ErrBucketNameRequired is returned when creating a bucket with a blank name.
ErrBucketNameRequired = errors.New("bucket name required")
// ErrKeyRequired is returned when inserting a zero-length key.
ErrKeyRequired = errors.New("key required")
// ErrKeyTooLarge is returned when inserting a key that is larger than MaxKeySize.
ErrKeyTooLarge = errors.New("key too large")
// ErrValueTooLarge is returned when inserting a value that is larger than MaxValueSize.
ErrValueTooLarge = errors.New("value too large")
// ErrIncompatibleValue is returned when trying create or delete a bucket
// on an existing non-bucket key or when trying to create or delete a
// non-bucket key on an existing bucket key.
ErrIncompatibleValue = errors.New("incompatible value")
)

248
vendor/github.com/boltdb/bolt/freelist.go generated vendored
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@ -1,248 +0,0 @@
package bolt
import (
"fmt"
"sort"
"unsafe"
)
// freelist represents a list of all pages that are available for allocation.
// It also tracks pages that have been freed but are still in use by open transactions.
type freelist struct {
ids []pgid // all free and available free page ids.
pending map[txid][]pgid // mapping of soon-to-be free page ids by tx.
cache map[pgid]bool // fast lookup of all free and pending page ids.
}
// newFreelist returns an empty, initialized freelist.
func newFreelist() *freelist {
return &freelist{
pending: make(map[txid][]pgid),
cache: make(map[pgid]bool),
}
}
// size returns the size of the page after serialization.
func (f *freelist) size() int {
return pageHeaderSize + (int(unsafe.Sizeof(pgid(0))) * f.count())
}
// count returns count of pages on the freelist
func (f *freelist) count() int {
return f.free_count() + f.pending_count()
}
// free_count returns count of free pages
func (f *freelist) free_count() int {
return len(f.ids)
}
// pending_count returns count of pending pages
func (f *freelist) pending_count() int {
var count int
for _, list := range f.pending {
count += len(list)
}
return count
}
// all returns a list of all free ids and all pending ids in one sorted list.
func (f *freelist) all() []pgid {
m := make(pgids, 0)
for _, list := range f.pending {
m = append(m, list...)
}
sort.Sort(m)
return pgids(f.ids).merge(m)
}
// allocate returns the starting page id of a contiguous list of pages of a given size.
// If a contiguous block cannot be found then 0 is returned.
func (f *freelist) allocate(n int) pgid {
if len(f.ids) == 0 {
return 0
}
var initial, previd pgid
for i, id := range f.ids {
if id <= 1 {
panic(fmt.Sprintf("invalid page allocation: %d", id))
}
// Reset initial page if this is not contiguous.
if previd == 0 || id-previd != 1 {
initial = id
}
// If we found a contiguous block then remove it and return it.
if (id-initial)+1 == pgid(n) {
// If we're allocating off the beginning then take the fast path
// and just adjust the existing slice. This will use extra memory
// temporarily but the append() in free() will realloc the slice
// as is necessary.
if (i + 1) == n {
f.ids = f.ids[i+1:]
} else {
copy(f.ids[i-n+1:], f.ids[i+1:])
f.ids = f.ids[:len(f.ids)-n]
}
// Remove from the free cache.
for i := pgid(0); i < pgid(n); i++ {
delete(f.cache, initial+i)
}
return initial
}
previd = id
}
return 0
}
// free releases a page and its overflow for a given transaction id.
// If the page is already free then a panic will occur.
func (f *freelist) free(txid txid, p *page) {
if p.id <= 1 {
panic(fmt.Sprintf("cannot free page 0 or 1: %d", p.id))
}
// Free page and all its overflow pages.
var ids = f.pending[txid]
for id := p.id; id <= p.id+pgid(p.overflow); id++ {
// Verify that page is not already free.
if f.cache[id] {
panic(fmt.Sprintf("page %d already freed", id))
}
// Add to the freelist and cache.
ids = append(ids, id)
f.cache[id] = true
}
f.pending[txid] = ids
}
// release moves all page ids for a transaction id (or older) to the freelist.
func (f *freelist) release(txid txid) {
m := make(pgids, 0)
for tid, ids := range f.pending {
if tid <= txid {
// Move transaction's pending pages to the available freelist.
// Don't remove from the cache since the page is still free.
m = append(m, ids...)
delete(f.pending, tid)
}
}
sort.Sort(m)
f.ids = pgids(f.ids).merge(m)
}
// rollback removes the pages from a given pending tx.
func (f *freelist) rollback(txid txid) {
// Remove page ids from cache.
for _, id := range f.pending[txid] {
delete(f.cache, id)
}
// Remove pages from pending list.
delete(f.pending, txid)
}
// freed returns whether a given page is in the free list.
func (f *freelist) freed(pgid pgid) bool {
return f.cache[pgid]
}
// read initializes the freelist from a freelist page.
func (f *freelist) read(p *page) {
// If the page.count is at the max uint16 value (64k) then it's considered
// an overflow and the size of the freelist is stored as the first element.
idx, count := 0, int(p.count)
if count == 0xFFFF {
idx = 1
count = int(((*[maxAllocSize]pgid)(unsafe.Pointer(&p.ptr)))[0])
}
// Copy the list of page ids from the freelist.
if count == 0 {
f.ids = nil
} else {
ids := ((*[maxAllocSize]pgid)(unsafe.Pointer(&p.ptr)))[idx:count]
f.ids = make([]pgid, len(ids))
copy(f.ids, ids)
// Make sure they're sorted.
sort.Sort(pgids(f.ids))
}
// Rebuild the page cache.
f.reindex()
}
// write writes the page ids onto a freelist page. All free and pending ids are
// saved to disk since in the event of a program crash, all pending ids will
// become free.
func (f *freelist) write(p *page) error {
// Combine the old free pgids and pgids waiting on an open transaction.
ids := f.all()
// Update the header flag.
p.flags |= freelistPageFlag
// The page.count can only hold up to 64k elements so if we overflow that
// number then we handle it by putting the size in the first element.
if len(ids) == 0 {
p.count = uint16(len(ids))
} else if len(ids) < 0xFFFF {
p.count = uint16(len(ids))
copy(((*[maxAllocSize]pgid)(unsafe.Pointer(&p.ptr)))[:], ids)
} else {
p.count = 0xFFFF
((*[maxAllocSize]pgid)(unsafe.Pointer(&p.ptr)))[0] = pgid(len(ids))
copy(((*[maxAllocSize]pgid)(unsafe.Pointer(&p.ptr)))[1:], ids)
}
return nil
}
// reload reads the freelist from a page and filters out pending items.
func (f *freelist) reload(p *page) {
f.read(p)
// Build a cache of only pending pages.
pcache := make(map[pgid]bool)
for _, pendingIDs := range f.pending {
for _, pendingID := range pendingIDs {
pcache[pendingID] = true
}
}
// Check each page in the freelist and build a new available freelist
// with any pages not in the pending lists.
var a []pgid
for _, id := range f.ids {
if !pcache[id] {
a = append(a, id)
}
}
f.ids = a
// Once the available list is rebuilt then rebuild the free cache so that
// it includes the available and pending free pages.
f.reindex()
}
// reindex rebuilds the free cache based on available and pending free lists.
func (f *freelist) reindex() {
f.cache = make(map[pgid]bool, len(f.ids))
for _, id := range f.ids {
f.cache[id] = true
}
for _, pendingIDs := range f.pending {
for _, pendingID := range pendingIDs {
f.cache[pendingID] = true
}
}
}

604
vendor/github.com/boltdb/bolt/node.go generated vendored
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@ -1,604 +0,0 @@
package bolt
import (
"bytes"
"fmt"
"sort"
"unsafe"
)
// node represents an in-memory, deserialized page.
type node struct {
bucket *Bucket
isLeaf bool
unbalanced bool
spilled bool
key []byte
pgid pgid
parent *node
children nodes
inodes inodes
}
// root returns the top-level node this node is attached to.
func (n *node) root() *node {
if n.parent == nil {
return n
}
return n.parent.root()
}
// minKeys returns the minimum number of inodes this node should have.
func (n *node) minKeys() int {
if n.isLeaf {
return 1
}
return 2
}
// size returns the size of the node after serialization.
func (n *node) size() int {
sz, elsz := pageHeaderSize, n.pageElementSize()
for i := 0; i < len(n.inodes); i++ {
item := &n.inodes[i]
sz += elsz + len(item.key) + len(item.value)
}
return sz
}
// sizeLessThan returns true if the node is less than a given size.
// This is an optimization to avoid calculating a large node when we only need
// to know if it fits inside a certain page size.
func (n *node) sizeLessThan(v int) bool {
sz, elsz := pageHeaderSize, n.pageElementSize()
for i := 0; i < len(n.inodes); i++ {
item := &n.inodes[i]
sz += elsz + len(item.key) + len(item.value)
if sz >= v {
return false
}
}
return true
}
// pageElementSize returns the size of each page element based on the type of node.
func (n *node) pageElementSize() int {
if n.isLeaf {
return leafPageElementSize
}
return branchPageElementSize
}
// childAt returns the child node at a given index.
func (n *node) childAt(index int) *node {
if n.isLeaf {
panic(fmt.Sprintf("invalid childAt(%d) on a leaf node", index))
}
return n.bucket.node(n.inodes[index].pgid, n)
}
// childIndex returns the index of a given child node.
func (n *node) childIndex(child *node) int {
index := sort.Search(len(n.inodes), func(i int) bool { return bytes.Compare(n.inodes[i].key, child.key) != -1 })
return index
}
// numChildren returns the number of children.
func (n *node) numChildren() int {
return len(n.inodes)
}
// nextSibling returns the next node with the same parent.
func (n *node) nextSibling() *node {
if n.parent == nil {
return nil
}
index := n.parent.childIndex(n)
if index >= n.parent.numChildren()-1 {
return nil
}
return n.parent.childAt(index + 1)
}
// prevSibling returns the previous node with the same parent.
func (n *node) prevSibling() *node {
if n.parent == nil {
return nil
}
index := n.parent.childIndex(n)
if index == 0 {
return nil
}
return n.parent.childAt(index - 1)
}
// put inserts a key/value.
func (n *node) put(oldKey, newKey, value []byte, pgid pgid, flags uint32) {
if pgid >= n.bucket.tx.meta.pgid {
panic(fmt.Sprintf("pgid (%d) above high water mark (%d)", pgid, n.bucket.tx.meta.pgid))
} else if len(oldKey) <= 0 {
panic("put: zero-length old key")
} else if len(newKey) <= 0 {
panic("put: zero-length new key")
}
// Find insertion index.
index := sort.Search(len(n.inodes), func(i int) bool { return bytes.Compare(n.inodes[i].key, oldKey) != -1 })
// Add capacity and shift nodes if we don't have an exact match and need to insert.
exact := (len(n.inodes) > 0 && index < len(n.inodes) && bytes.Equal(n.inodes[index].key, oldKey))
if !exact {
n.inodes = append(n.inodes, inode{})
copy(n.inodes[index+1:], n.inodes[index:])
}
inode := &n.inodes[index]
inode.flags = flags
inode.key = newKey
inode.value = value
inode.pgid = pgid
_assert(len(inode.key) > 0, "put: zero-length inode key")
}
// del removes a key from the node.
func (n *node) del(key []byte) {
// Find index of key.
index := sort.Search(len(n.inodes), func(i int) bool { return bytes.Compare(n.inodes[i].key, key) != -1 })
// Exit if the key isn't found.
if index >= len(n.inodes) || !bytes.Equal(n.inodes[index].key, key) {
return
}
// Delete inode from the node.
n.inodes = append(n.inodes[:index], n.inodes[index+1:]...)
// Mark the node as needing rebalancing.
n.unbalanced = true
}
// read initializes the node from a page.
func (n *node) read(p *page) {
n.pgid = p.id
n.isLeaf = ((p.flags & leafPageFlag) != 0)
n.inodes = make(inodes, int(p.count))
for i := 0; i < int(p.count); i++ {
inode := &n.inodes[i]
if n.isLeaf {
elem := p.leafPageElement(uint16(i))
inode.flags = elem.flags
inode.key = elem.key()
inode.value = elem.value()
} else {
elem := p.branchPageElement(uint16(i))
inode.pgid = elem.pgid
inode.key = elem.key()
}
_assert(len(inode.key) > 0, "read: zero-length inode key")
}
// Save first key so we can find the node in the parent when we spill.
if len(n.inodes) > 0 {
n.key = n.inodes[0].key
_assert(len(n.key) > 0, "read: zero-length node key")
} else {
n.key = nil
}
}
// write writes the items onto one or more pages.
func (n *node) write(p *page) {
// Initialize page.
if n.isLeaf {
p.flags |= leafPageFlag
} else {
p.flags |= branchPageFlag
}
if len(n.inodes) >= 0xFFFF {
panic(fmt.Sprintf("inode overflow: %d (pgid=%d)", len(n.inodes), p.id))
}
p.count = uint16(len(n.inodes))
// Stop here if there are no items to write.
if p.count == 0 {
return
}
// Loop over each item and write it to the page.
b := (*[maxAllocSize]byte)(unsafe.Pointer(&p.ptr))[n.pageElementSize()*len(n.inodes):]
for i, item := range n.inodes {
_assert(len(item.key) > 0, "write: zero-length inode key")
// Write the page element.
if n.isLeaf {
elem := p.leafPageElement(uint16(i))
elem.pos = uint32(uintptr(unsafe.Pointer(&b[0])) - uintptr(unsafe.Pointer(elem)))
elem.flags = item.flags
elem.ksize = uint32(len(item.key))
elem.vsize = uint32(len(item.value))
} else {
elem := p.branchPageElement(uint16(i))
elem.pos = uint32(uintptr(unsafe.Pointer(&b[0])) - uintptr(unsafe.Pointer(elem)))
elem.ksize = uint32(len(item.key))
elem.pgid = item.pgid
_assert(elem.pgid != p.id, "write: circular dependency occurred")
}
// If the length of key+value is larger than the max allocation size
// then we need to reallocate the byte array pointer.
//
// See: https://github.com/boltdb/bolt/pull/335
klen, vlen := len(item.key), len(item.value)
if len(b) < klen+vlen {
b = (*[maxAllocSize]byte)(unsafe.Pointer(&b[0]))[:]
}
// Write data for the element to the end of the page.
copy(b[0:], item.key)
b = b[klen:]
copy(b[0:], item.value)
b = b[vlen:]
}
// DEBUG ONLY: n.dump()
}
// split breaks up a node into multiple smaller nodes, if appropriate.
// This should only be called from the spill() function.
func (n *node) split(pageSize int) []*node {
var nodes []*node
node := n
for {
// Split node into two.
a, b := node.splitTwo(pageSize)
nodes = append(nodes, a)
// If we can't split then exit the loop.
if b == nil {
break
}
// Set node to b so it gets split on the next iteration.
node = b
}
return nodes
}
// splitTwo breaks up a node into two smaller nodes, if appropriate.
// This should only be called from the split() function.
func (n *node) splitTwo(pageSize int) (*node, *node) {
// Ignore the split if the page doesn't have at least enough nodes for
// two pages or if the nodes can fit in a single page.
if len(n.inodes) <= (minKeysPerPage*2) || n.sizeLessThan(pageSize) {
return n, nil
}
// Determine the threshold before starting a new node.
var fillPercent = n.bucket.FillPercent
if fillPercent < minFillPercent {
fillPercent = minFillPercent
} else if fillPercent > maxFillPercent {
fillPercent = maxFillPercent
}
threshold := int(float64(pageSize) * fillPercent)
// Determine split position and sizes of the two pages.
splitIndex, _ := n.splitIndex(threshold)
// Split node into two separate nodes.
// If there's no parent then we'll need to create one.
if n.parent == nil {
n.parent = &node{bucket: n.bucket, children: []*node{n}}
}
// Create a new node and add it to the parent.
next := &node{bucket: n.bucket, isLeaf: n.isLeaf, parent: n.parent}
n.parent.children = append(n.parent.children, next)
// Split inodes across two nodes.
next.inodes = n.inodes[splitIndex:]
n.inodes = n.inodes[:splitIndex]
// Update the statistics.
n.bucket.tx.stats.Split++
return n, next
}
// splitIndex finds the position where a page will fill a given threshold.
// It returns the index as well as the size of the first page.
// This is only be called from split().
func (n *node) splitIndex(threshold int) (index, sz int) {
sz = pageHeaderSize
// Loop until we only have the minimum number of keys required for the second page.
for i := 0; i < len(n.inodes)-minKeysPerPage; i++ {
index = i
inode := n.inodes[i]
elsize := n.pageElementSize() + len(inode.key) + len(inode.value)
// If we have at least the minimum number of keys and adding another
// node would put us over the threshold then exit and return.
if i >= minKeysPerPage && sz+elsize > threshold {
break
}
// Add the element size to the total size.
sz += elsize
}
return
}
// spill writes the nodes to dirty pages and splits nodes as it goes.
// Returns an error if dirty pages cannot be allocated.
func (n *node) spill() error {
var tx = n.bucket.tx
if n.spilled {
return nil
}
// Spill child nodes first. Child nodes can materialize sibling nodes in
// the case of split-merge so we cannot use a range loop. We have to check
// the children size on every loop iteration.
sort.Sort(n.children)
for i := 0; i < len(n.children); i++ {
if err := n.children[i].spill(); err != nil {
return err
}
}
// We no longer need the child list because it's only used for spill tracking.
n.children = nil
// Split nodes into appropriate sizes. The first node will always be n.
var nodes = n.split(tx.db.pageSize)
for _, node := range nodes {
// Add node's page to the freelist if it's not new.
if node.pgid > 0 {
tx.db.freelist.free(tx.meta.txid, tx.page(node.pgid))
node.pgid = 0
}
// Allocate contiguous space for the node.
p, err := tx.allocate((node.size() / tx.db.pageSize) + 1)
if err != nil {
return err
}
// Write the node.
if p.id >= tx.meta.pgid {
panic(fmt.Sprintf("pgid (%d) above high water mark (%d)", p.id, tx.meta.pgid))
}
node.pgid = p.id
node.write(p)
node.spilled = true
// Insert into parent inodes.
if node.parent != nil {
var key = node.key
if key == nil {
key = node.inodes[0].key
}
node.parent.put(key, node.inodes[0].key, nil, node.pgid, 0)
node.key = node.inodes[0].key
_assert(len(node.key) > 0, "spill: zero-length node key")
}
// Update the statistics.
tx.stats.Spill++
}
// If the root node split and created a new root then we need to spill that
// as well. We'll clear out the children to make sure it doesn't try to respill.
if n.parent != nil && n.parent.pgid == 0 {
n.children = nil
return n.parent.spill()
}
return nil
}
// rebalance attempts to combine the node with sibling nodes if the node fill
// size is below a threshold or if there are not enough keys.
func (n *node) rebalance() {
if !n.unbalanced {
return
}
n.unbalanced = false
// Update statistics.
n.bucket.tx.stats.Rebalance++
// Ignore if node is above threshold (25%) and has enough keys.
var threshold = n.bucket.tx.db.pageSize / 4
if n.size() > threshold && len(n.inodes) > n.minKeys() {
return
}
// Root node has special handling.
if n.parent == nil {
// If root node is a branch and only has one node then collapse it.
if !n.isLeaf && len(n.inodes) == 1 {
// Move root's child up.
child := n.bucket.node(n.inodes[0].pgid, n)
n.isLeaf = child.isLeaf
n.inodes = child.inodes[:]
n.children = child.children
// Reparent all child nodes being moved.
for _, inode := range n.inodes {
if child, ok := n.bucket.nodes[inode.pgid]; ok {
child.parent = n
}
}
// Remove old child.
child.parent = nil
delete(n.bucket.nodes, child.pgid)
child.free()
}
return
}
// If node has no keys then just remove it.
if n.numChildren() == 0 {
n.parent.del(n.key)
n.parent.removeChild(n)
delete(n.bucket.nodes, n.pgid)
n.free()
n.parent.rebalance()
return
}
_assert(n.parent.numChildren() > 1, "parent must have at least 2 children")
// Destination node is right sibling if idx == 0, otherwise left sibling.
var target *node
var useNextSibling = (n.parent.childIndex(n) == 0)
if useNextSibling {
target = n.nextSibling()
} else {
target = n.prevSibling()
}
// If both this node and the target node are too small then merge them.
if useNextSibling {
// Reparent all child nodes being moved.
for _, inode := range target.inodes {
if child, ok := n.bucket.nodes[inode.pgid]; ok {
child.parent.removeChild(child)
child.parent = n
child.parent.children = append(child.parent.children, child)
}
}
// Copy over inodes from target and remove target.
n.inodes = append(n.inodes, target.inodes...)
n.parent.del(target.key)
n.parent.removeChild(target)
delete(n.bucket.nodes, target.pgid)
target.free()
} else {
// Reparent all child nodes being moved.
for _, inode := range n.inodes {
if child, ok := n.bucket.nodes[inode.pgid]; ok {
child.parent.removeChild(child)
child.parent = target
child.parent.children = append(child.parent.children, child)
}
}
// Copy over inodes to target and remove node.
target.inodes = append(target.inodes, n.inodes...)
n.parent.del(n.key)
n.parent.removeChild(n)
delete(n.bucket.nodes, n.pgid)
n.free()
}
// Either this node or the target node was deleted from the parent so rebalance it.
n.parent.rebalance()
}
// removes a node from the list of in-memory children.
// This does not affect the inodes.
func (n *node) removeChild(target *node) {
for i, child := range n.children {
if child == target {
n.children = append(n.children[:i], n.children[i+1:]...)
return
}
}
}
// dereference causes the node to copy all its inode key/value references to heap memory.
// This is required when the mmap is reallocated so inodes are not pointing to stale data.
func (n *node) dereference() {
if n.key != nil {
key := make([]byte, len(n.key))
copy(key, n.key)
n.key = key
_assert(n.pgid == 0 || len(n.key) > 0, "dereference: zero-length node key on existing node")
}
for i := range n.inodes {
inode := &n.inodes[i]
key := make([]byte, len(inode.key))
copy(key, inode.key)
inode.key = key
_assert(len(inode.key) > 0, "dereference: zero-length inode key")
value := make([]byte, len(inode.value))
copy(value, inode.value)
inode.value = value
}
// Recursively dereference children.
for _, child := range n.children {
child.dereference()
}
// Update statistics.
n.bucket.tx.stats.NodeDeref++
}
// free adds the node's underlying page to the freelist.
func (n *node) free() {
if n.pgid != 0 {
n.bucket.tx.db.freelist.free(n.bucket.tx.meta.txid, n.bucket.tx.page(n.pgid))
n.pgid = 0
}
}
// dump writes the contents of the node to STDERR for debugging purposes.
/*
func (n *node) dump() {
// Write node header.
var typ = "branch"
if n.isLeaf {
typ = "leaf"
}
warnf("[NODE %d {type=%s count=%d}]", n.pgid, typ, len(n.inodes))
// Write out abbreviated version of each item.
for _, item := range n.inodes {
if n.isLeaf {
if item.flags&bucketLeafFlag != 0 {
bucket := (*bucket)(unsafe.Pointer(&item.value[0]))
warnf("+L %08x -> (bucket root=%d)", trunc(item.key, 4), bucket.root)
} else {
warnf("+L %08x -> %08x", trunc(item.key, 4), trunc(item.value, 4))
}
} else {
warnf("+B %08x -> pgid=%d", trunc(item.key, 4), item.pgid)
}
}
warn("")
}
*/
type nodes []*node
func (s nodes) Len() int { return len(s) }
func (s nodes) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s nodes) Less(i, j int) bool { return bytes.Compare(s[i].inodes[0].key, s[j].inodes[0].key) == -1 }
// inode represents an internal node inside of a node.
// It can be used to point to elements in a page or point
// to an element which hasn't been added to a page yet.
type inode struct {
flags uint32
pgid pgid
key []byte
value []byte
}
type inodes []inode

178
vendor/github.com/boltdb/bolt/page.go generated vendored
View file

@ -1,178 +0,0 @@
package bolt
import (
"fmt"
"os"
"sort"
"unsafe"
)
const pageHeaderSize = int(unsafe.Offsetof(((*page)(nil)).ptr))
const minKeysPerPage = 2
const branchPageElementSize = int(unsafe.Sizeof(branchPageElement{}))
const leafPageElementSize = int(unsafe.Sizeof(leafPageElement{}))
const (
branchPageFlag = 0x01
leafPageFlag = 0x02
metaPageFlag = 0x04
freelistPageFlag = 0x10
)
const (
bucketLeafFlag = 0x01
)
type pgid uint64
type page struct {
id pgid
flags uint16
count uint16
overflow uint32
ptr uintptr
}
// typ returns a human readable page type string used for debugging.
func (p *page) typ() string {
if (p.flags & branchPageFlag) != 0 {
return "branch"
} else if (p.flags & leafPageFlag) != 0 {
return "leaf"
} else if (p.flags & metaPageFlag) != 0 {
return "meta"
} else if (p.flags & freelistPageFlag) != 0 {
return "freelist"
}
return fmt.Sprintf("unknown<%02x>", p.flags)
}
// meta returns a pointer to the metadata section of the page.
func (p *page) meta() *meta {
return (*meta)(unsafe.Pointer(&p.ptr))
}
// leafPageElement retrieves the leaf node by index
func (p *page) leafPageElement(index uint16) *leafPageElement {
n := &((*[0x7FFFFFF]leafPageElement)(unsafe.Pointer(&p.ptr)))[index]
return n
}
// leafPageElements retrieves a list of leaf nodes.
func (p *page) leafPageElements() []leafPageElement {
if p.count == 0 {
return nil
}
return ((*[0x7FFFFFF]leafPageElement)(unsafe.Pointer(&p.ptr)))[:]
}
// branchPageElement retrieves the branch node by index
func (p *page) branchPageElement(index uint16) *branchPageElement {
return &((*[0x7FFFFFF]branchPageElement)(unsafe.Pointer(&p.ptr)))[index]
}
// branchPageElements retrieves a list of branch nodes.
func (p *page) branchPageElements() []branchPageElement {
if p.count == 0 {
return nil
}
return ((*[0x7FFFFFF]branchPageElement)(unsafe.Pointer(&p.ptr)))[:]
}
// dump writes n bytes of the page to STDERR as hex output.
func (p *page) hexdump(n int) {
buf := (*[maxAllocSize]byte)(unsafe.Pointer(p))[:n]
fmt.Fprintf(os.Stderr, "%x\n", buf)
}
type pages []*page
func (s pages) Len() int { return len(s) }
func (s pages) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s pages) Less(i, j int) bool { return s[i].id < s[j].id }
// branchPageElement represents a node on a branch page.
type branchPageElement struct {
pos uint32
ksize uint32
pgid pgid
}
// key returns a byte slice of the node key.
func (n *branchPageElement) key() []byte {
buf := (*[maxAllocSize]byte)(unsafe.Pointer(n))
return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos]))[:n.ksize]
}
// leafPageElement represents a node on a leaf page.
type leafPageElement struct {
flags uint32
pos uint32
ksize uint32
vsize uint32
}
// key returns a byte slice of the node key.
func (n *leafPageElement) key() []byte {
buf := (*[maxAllocSize]byte)(unsafe.Pointer(n))
return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos]))[:n.ksize:n.ksize]
}
// value returns a byte slice of the node value.
func (n *leafPageElement) value() []byte {
buf := (*[maxAllocSize]byte)(unsafe.Pointer(n))
return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos+n.ksize]))[:n.vsize:n.vsize]
}
// PageInfo represents human readable information about a page.
type PageInfo struct {
ID int
Type string
Count int
OverflowCount int
}
type pgids []pgid
func (s pgids) Len() int { return len(s) }
func (s pgids) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s pgids) Less(i, j int) bool { return s[i] < s[j] }
// merge returns the sorted union of a and b.
func (a pgids) merge(b pgids) pgids {
// Return the opposite slice if one is nil.
if len(a) == 0 {
return b
} else if len(b) == 0 {
return a
}
// Create a list to hold all elements from both lists.
merged := make(pgids, 0, len(a)+len(b))
// Assign lead to the slice with a lower starting value, follow to the higher value.
lead, follow := a, b
if b[0] < a[0] {
lead, follow = b, a
}
// Continue while there are elements in the lead.
for len(lead) > 0 {
// Merge largest prefix of lead that is ahead of follow[0].
n := sort.Search(len(lead), func(i int) bool { return lead[i] > follow[0] })
merged = append(merged, lead[:n]...)
if n >= len(lead) {
break
}
// Swap lead and follow.
lead, follow = follow, lead[n:]
}
// Append what's left in follow.
merged = append(merged, follow...)
return merged
}

682
vendor/github.com/boltdb/bolt/tx.go generated vendored
View file

@ -1,682 +0,0 @@
package bolt
import (
"fmt"
"io"
"os"
"sort"
"strings"
"time"
"unsafe"
)
// txid represents the internal transaction identifier.
type txid uint64
// Tx represents a read-only or read/write transaction on the database.
// Read-only transactions can be used for retrieving values for keys and creating cursors.
// Read/write transactions can create and remove buckets and create and remove keys.
//
// IMPORTANT: You must commit or rollback transactions when you are done with
// them. Pages can not be reclaimed by the writer until no more transactions
// are using them. A long running read transaction can cause the database to
// quickly grow.
type Tx struct {
writable bool
managed bool
db *DB
meta *meta
root Bucket
pages map[pgid]*page
stats TxStats
commitHandlers []func()
// WriteFlag specifies the flag for write-related methods like WriteTo().
// Tx opens the database file with the specified flag to copy the data.
//
// By default, the flag is unset, which works well for mostly in-memory
// workloads. For databases that are much larger than available RAM,
// set the flag to syscall.O_DIRECT to avoid trashing the page cache.
WriteFlag int
}
// init initializes the transaction.
func (tx *Tx) init(db *DB) {
tx.db = db
tx.pages = nil
// Copy the meta page since it can be changed by the writer.
tx.meta = &meta{}
db.meta().copy(tx.meta)
// Copy over the root bucket.
tx.root = newBucket(tx)
tx.root.bucket = &bucket{}
*tx.root.bucket = tx.meta.root
// Increment the transaction id and add a page cache for writable transactions.
if tx.writable {
tx.pages = make(map[pgid]*page)
tx.meta.txid += txid(1)
}
}
// ID returns the transaction id.
func (tx *Tx) ID() int {
return int(tx.meta.txid)
}
// DB returns a reference to the database that created the transaction.
func (tx *Tx) DB() *DB {
return tx.db
}
// Size returns current database size in bytes as seen by this transaction.
func (tx *Tx) Size() int64 {
return int64(tx.meta.pgid) * int64(tx.db.pageSize)
}
// Writable returns whether the transaction can perform write operations.
func (tx *Tx) Writable() bool {
return tx.writable
}
// Cursor creates a cursor associated with the root bucket.
// All items in the cursor will return a nil value because all root bucket keys point to buckets.
// The cursor is only valid as long as the transaction is open.
// Do not use a cursor after the transaction is closed.
func (tx *Tx) Cursor() *Cursor {
return tx.root.Cursor()
}
// Stats retrieves a copy of the current transaction statistics.
func (tx *Tx) Stats() TxStats {
return tx.stats
}
// Bucket retrieves a bucket by name.
// Returns nil if the bucket does not exist.
// The bucket instance is only valid for the lifetime of the transaction.
func (tx *Tx) Bucket(name []byte) *Bucket {
return tx.root.Bucket(name)
}
// CreateBucket creates a new bucket.
// Returns an error if the bucket already exists, if the bucket name is blank, or if the bucket name is too long.
// The bucket instance is only valid for the lifetime of the transaction.
func (tx *Tx) CreateBucket(name []byte) (*Bucket, error) {
return tx.root.CreateBucket(name)
}
// CreateBucketIfNotExists creates a new bucket if it doesn't already exist.
// Returns an error if the bucket name is blank, or if the bucket name is too long.
// The bucket instance is only valid for the lifetime of the transaction.
func (tx *Tx) CreateBucketIfNotExists(name []byte) (*Bucket, error) {
return tx.root.CreateBucketIfNotExists(name)
}
// DeleteBucket deletes a bucket.
// Returns an error if the bucket cannot be found or if the key represents a non-bucket value.
func (tx *Tx) DeleteBucket(name []byte) error {
return tx.root.DeleteBucket(name)
}
// ForEach executes a function for each bucket in the root.
// If the provided function returns an error then the iteration is stopped and
// the error is returned to the caller.
func (tx *Tx) ForEach(fn func(name []byte, b *Bucket) error) error {
return tx.root.ForEach(func(k, v []byte) error {
if err := fn(k, tx.root.Bucket(k)); err != nil {
return err
}
return nil
})
}
// OnCommit adds a handler function to be executed after the transaction successfully commits.
func (tx *Tx) OnCommit(fn func()) {
tx.commitHandlers = append(tx.commitHandlers, fn)
}
// Commit writes all changes to disk and updates the meta page.
// Returns an error if a disk write error occurs, or if Commit is
// called on a read-only transaction.
func (tx *Tx) Commit() error {
_assert(!tx.managed, "managed tx commit not allowed")
if tx.db == nil {
return ErrTxClosed
} else if !tx.writable {
return ErrTxNotWritable
}
// TODO(benbjohnson): Use vectorized I/O to write out dirty pages.
// Rebalance nodes which have had deletions.
var startTime = time.Now()
tx.root.rebalance()
if tx.stats.Rebalance > 0 {
tx.stats.RebalanceTime += time.Since(startTime)
}
// spill data onto dirty pages.
startTime = time.Now()
if err := tx.root.spill(); err != nil {
tx.rollback()
return err
}
tx.stats.SpillTime += time.Since(startTime)
// Free the old root bucket.
tx.meta.root.root = tx.root.root
opgid := tx.meta.pgid
// Free the freelist and allocate new pages for it. This will overestimate
// the size of the freelist but not underestimate the size (which would be bad).
tx.db.freelist.free(tx.meta.txid, tx.db.page(tx.meta.freelist))
p, err := tx.allocate((tx.db.freelist.size() / tx.db.pageSize) + 1)
if err != nil {
tx.rollback()
return err
}
if err := tx.db.freelist.write(p); err != nil {
tx.rollback()
return err
}
tx.meta.freelist = p.id
// If the high water mark has moved up then attempt to grow the database.
if tx.meta.pgid > opgid {
if err := tx.db.grow(int(tx.meta.pgid+1) * tx.db.pageSize); err != nil {
tx.rollback()
return err
}
}
// Write dirty pages to disk.
startTime = time.Now()
if err := tx.write(); err != nil {
tx.rollback()
return err
}
// If strict mode is enabled then perform a consistency check.
// Only the first consistency error is reported in the panic.
if tx.db.StrictMode {
ch := tx.Check()
var errs []string
for {
err, ok := <-ch
if !ok {
break
}
errs = append(errs, err.Error())
}
if len(errs) > 0 {
panic("check fail: " + strings.Join(errs, "\n"))
}
}
// Write meta to disk.
if err := tx.writeMeta(); err != nil {
tx.rollback()
return err
}
tx.stats.WriteTime += time.Since(startTime)
// Finalize the transaction.
tx.close()
// Execute commit handlers now that the locks have been removed.
for _, fn := range tx.commitHandlers {
fn()
}
return nil
}
// Rollback closes the transaction and ignores all previous updates. Read-only
// transactions must be rolled back and not committed.
func (tx *Tx) Rollback() error {
_assert(!tx.managed, "managed tx rollback not allowed")
if tx.db == nil {
return ErrTxClosed
}
tx.rollback()
return nil
}
func (tx *Tx) rollback() {
if tx.db == nil {
return
}
if tx.writable {
tx.db.freelist.rollback(tx.meta.txid)
tx.db.freelist.reload(tx.db.page(tx.db.meta().freelist))
}
tx.close()
}
func (tx *Tx) close() {
if tx.db == nil {
return
}
if tx.writable {
// Grab freelist stats.
var freelistFreeN = tx.db.freelist.free_count()
var freelistPendingN = tx.db.freelist.pending_count()
var freelistAlloc = tx.db.freelist.size()
// Remove transaction ref & writer lock.
tx.db.rwtx = nil
tx.db.rwlock.Unlock()
// Merge statistics.
tx.db.statlock.Lock()
tx.db.stats.FreePageN = freelistFreeN
tx.db.stats.PendingPageN = freelistPendingN
tx.db.stats.FreeAlloc = (freelistFreeN + freelistPendingN) * tx.db.pageSize
tx.db.stats.FreelistInuse = freelistAlloc
tx.db.stats.TxStats.add(&tx.stats)
tx.db.statlock.Unlock()
} else {
tx.db.removeTx(tx)
}
// Clear all references.
tx.db = nil
tx.meta = nil
tx.root = Bucket{tx: tx}
tx.pages = nil
}
// Copy writes the entire database to a writer.
// This function exists for backwards compatibility. Use WriteTo() instead.
func (tx *Tx) Copy(w io.Writer) error {
_, err := tx.WriteTo(w)
return err
}
// WriteTo writes the entire database to a writer.
// If err == nil then exactly tx.Size() bytes will be written into the writer.
func (tx *Tx) WriteTo(w io.Writer) (n int64, err error) {
// Attempt to open reader with WriteFlag
f, err := os.OpenFile(tx.db.path, os.O_RDONLY|tx.WriteFlag, 0)
if err != nil {
return 0, err
}
defer func() { _ = f.Close() }()
// Generate a meta page. We use the same page data for both meta pages.
buf := make([]byte, tx.db.pageSize)
page := (*page)(unsafe.Pointer(&buf[0]))
page.flags = metaPageFlag
*page.meta() = *tx.meta
// Write meta 0.
page.id = 0
page.meta().checksum = page.meta().sum64()
nn, err := w.Write(buf)
n += int64(nn)
if err != nil {
return n, fmt.Errorf("meta 0 copy: %s", err)
}
// Write meta 1 with a lower transaction id.
page.id = 1
page.meta().txid -= 1
page.meta().checksum = page.meta().sum64()
nn, err = w.Write(buf)
n += int64(nn)
if err != nil {
return n, fmt.Errorf("meta 1 copy: %s", err)
}
// Move past the meta pages in the file.
if _, err := f.Seek(int64(tx.db.pageSize*2), os.SEEK_SET); err != nil {
return n, fmt.Errorf("seek: %s", err)
}
// Copy data pages.
wn, err := io.CopyN(w, f, tx.Size()-int64(tx.db.pageSize*2))
n += wn
if err != nil {
return n, err
}
return n, f.Close()
}
// CopyFile copies the entire database to file at the given path.
// A reader transaction is maintained during the copy so it is safe to continue
// using the database while a copy is in progress.
func (tx *Tx) CopyFile(path string, mode os.FileMode) error {
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, mode)
if err != nil {
return err
}
err = tx.Copy(f)
if err != nil {
_ = f.Close()
return err
}
return f.Close()
}
// Check performs several consistency checks on the database for this transaction.
// An error is returned if any inconsistency is found.
//
// It can be safely run concurrently on a writable transaction. However, this
// incurs a high cost for large databases and databases with a lot of subbuckets
// because of caching. This overhead can be removed if running on a read-only
// transaction, however, it is not safe to execute other writer transactions at
// the same time.
func (tx *Tx) Check() <-chan error {
ch := make(chan error)
go tx.check(ch)
return ch
}
func (tx *Tx) check(ch chan error) {
// Check if any pages are double freed.
freed := make(map[pgid]bool)
for _, id := range tx.db.freelist.all() {
if freed[id] {
ch <- fmt.Errorf("page %d: already freed", id)
}
freed[id] = true
}
// Track every reachable page.
reachable := make(map[pgid]*page)
reachable[0] = tx.page(0) // meta0
reachable[1] = tx.page(1) // meta1
for i := uint32(0); i <= tx.page(tx.meta.freelist).overflow; i++ {
reachable[tx.meta.freelist+pgid(i)] = tx.page(tx.meta.freelist)
}
// Recursively check buckets.
tx.checkBucket(&tx.root, reachable, freed, ch)
// Ensure all pages below high water mark are either reachable or freed.
for i := pgid(0); i < tx.meta.pgid; i++ {
_, isReachable := reachable[i]
if !isReachable && !freed[i] {
ch <- fmt.Errorf("page %d: unreachable unfreed", int(i))
}
}
// Close the channel to signal completion.
close(ch)
}
func (tx *Tx) checkBucket(b *Bucket, reachable map[pgid]*page, freed map[pgid]bool, ch chan error) {
// Ignore inline buckets.
if b.root == 0 {
return
}
// Check every page used by this bucket.
b.tx.forEachPage(b.root, 0, func(p *page, _ int) {
if p.id > tx.meta.pgid {
ch <- fmt.Errorf("page %d: out of bounds: %d", int(p.id), int(b.tx.meta.pgid))
}
// Ensure each page is only referenced once.
for i := pgid(0); i <= pgid(p.overflow); i++ {
var id = p.id + i
if _, ok := reachable[id]; ok {
ch <- fmt.Errorf("page %d: multiple references", int(id))
}
reachable[id] = p
}
// We should only encounter un-freed leaf and branch pages.
if freed[p.id] {
ch <- fmt.Errorf("page %d: reachable freed", int(p.id))
} else if (p.flags&branchPageFlag) == 0 && (p.flags&leafPageFlag) == 0 {
ch <- fmt.Errorf("page %d: invalid type: %s", int(p.id), p.typ())
}
})
// Check each bucket within this bucket.
_ = b.ForEach(func(k, v []byte) error {
if child := b.Bucket(k); child != nil {
tx.checkBucket(child, reachable, freed, ch)
}
return nil
})
}
// allocate returns a contiguous block of memory starting at a given page.
func (tx *Tx) allocate(count int) (*page, error) {
p, err := tx.db.allocate(count)
if err != nil {
return nil, err
}
// Save to our page cache.
tx.pages[p.id] = p
// Update statistics.
tx.stats.PageCount++
tx.stats.PageAlloc += count * tx.db.pageSize
return p, nil
}
// write writes any dirty pages to disk.
func (tx *Tx) write() error {
// Sort pages by id.
pages := make(pages, 0, len(tx.pages))
for _, p := range tx.pages {
pages = append(pages, p)
}
// Clear out page cache early.
tx.pages = make(map[pgid]*page)
sort.Sort(pages)
// Write pages to disk in order.
for _, p := range pages {
size := (int(p.overflow) + 1) * tx.db.pageSize
offset := int64(p.id) * int64(tx.db.pageSize)
// Write out page in "max allocation" sized chunks.
ptr := (*[maxAllocSize]byte)(unsafe.Pointer(p))
for {
// Limit our write to our max allocation size.
sz := size
if sz > maxAllocSize-1 {
sz = maxAllocSize - 1
}
// Write chunk to disk.
buf := ptr[:sz]
if _, err := tx.db.ops.writeAt(buf, offset); err != nil {
return err
}
// Update statistics.
tx.stats.Write++
// Exit inner for loop if we've written all the chunks.
size -= sz
if size == 0 {
break
}
// Otherwise move offset forward and move pointer to next chunk.
offset += int64(sz)
ptr = (*[maxAllocSize]byte)(unsafe.Pointer(&ptr[sz]))
}
}
// Ignore file sync if flag is set on DB.
if !tx.db.NoSync || IgnoreNoSync {
if err := fdatasync(tx.db); err != nil {
return err
}
}
// Put small pages back to page pool.
for _, p := range pages {
// Ignore page sizes over 1 page.
// These are allocated using make() instead of the page pool.
if int(p.overflow) != 0 {
continue
}
buf := (*[maxAllocSize]byte)(unsafe.Pointer(p))[:tx.db.pageSize]
// See https://go.googlesource.com/go/+/f03c9202c43e0abb130669852082117ca50aa9b1
for i := range buf {
buf[i] = 0
}
tx.db.pagePool.Put(buf)
}
return nil
}
// writeMeta writes the meta to the disk.
func (tx *Tx) writeMeta() error {
// Create a temporary buffer for the meta page.
buf := make([]byte, tx.db.pageSize)
p := tx.db.pageInBuffer(buf, 0)
tx.meta.write(p)
// Write the meta page to file.
if _, err := tx.db.ops.writeAt(buf, int64(p.id)*int64(tx.db.pageSize)); err != nil {
return err
}
if !tx.db.NoSync || IgnoreNoSync {
if err := fdatasync(tx.db); err != nil {
return err
}
}
// Update statistics.
tx.stats.Write++
return nil
}
// page returns a reference to the page with a given id.
// If page has been written to then a temporary buffered page is returned.
func (tx *Tx) page(id pgid) *page {
// Check the dirty pages first.
if tx.pages != nil {
if p, ok := tx.pages[id]; ok {
return p
}
}
// Otherwise return directly from the mmap.
return tx.db.page(id)
}
// forEachPage iterates over every page within a given page and executes a function.
func (tx *Tx) forEachPage(pgid pgid, depth int, fn func(*page, int)) {
p := tx.page(pgid)
// Execute function.
fn(p, depth)
// Recursively loop over children.
if (p.flags & branchPageFlag) != 0 {
for i := 0; i < int(p.count); i++ {
elem := p.branchPageElement(uint16(i))
tx.forEachPage(elem.pgid, depth+1, fn)
}
}
}
// Page returns page information for a given page number.
// This is only safe for concurrent use when used by a writable transaction.
func (tx *Tx) Page(id int) (*PageInfo, error) {
if tx.db == nil {
return nil, ErrTxClosed
} else if pgid(id) >= tx.meta.pgid {
return nil, nil
}
// Build the page info.
p := tx.db.page(pgid(id))
info := &PageInfo{
ID: id,
Count: int(p.count),
OverflowCount: int(p.overflow),
}
// Determine the type (or if it's free).
if tx.db.freelist.freed(pgid(id)) {
info.Type = "free"
} else {
info.Type = p.typ()
}
return info, nil
}
// TxStats represents statistics about the actions performed by the transaction.
type TxStats struct {
// Page statistics.
PageCount int // number of page allocations
PageAlloc int // total bytes allocated
// Cursor statistics.
CursorCount int // number of cursors created
// Node statistics
NodeCount int // number of node allocations
NodeDeref int // number of node dereferences
// Rebalance statistics.
Rebalance int // number of node rebalances
RebalanceTime time.Duration // total time spent rebalancing
// Split/Spill statistics.
Split int // number of nodes split
Spill int // number of nodes spilled
SpillTime time.Duration // total time spent spilling
// Write statistics.
Write int // number of writes performed
WriteTime time.Duration // total time spent writing to disk
}
func (s *TxStats) add(other *TxStats) {
s.PageCount += other.PageCount
s.PageAlloc += other.PageAlloc
s.CursorCount += other.CursorCount
s.NodeCount += other.NodeCount
s.NodeDeref += other.NodeDeref
s.Rebalance += other.Rebalance
s.RebalanceTime += other.RebalanceTime
s.Split += other.Split
s.Spill += other.Spill
s.SpillTime += other.SpillTime
s.Write += other.Write
s.WriteTime += other.WriteTime
}
// Sub calculates and returns the difference between two sets of transaction stats.
// This is useful when obtaining stats at two different points and time and
// you need the performance counters that occurred within that time span.
func (s *TxStats) Sub(other *TxStats) TxStats {
var diff TxStats
diff.PageCount = s.PageCount - other.PageCount
diff.PageAlloc = s.PageAlloc - other.PageAlloc
diff.CursorCount = s.CursorCount - other.CursorCount
diff.NodeCount = s.NodeCount - other.NodeCount
diff.NodeDeref = s.NodeDeref - other.NodeDeref
diff.Rebalance = s.Rebalance - other.Rebalance
diff.RebalanceTime = s.RebalanceTime - other.RebalanceTime
diff.Split = s.Split - other.Split
diff.Spill = s.Spill - other.Spill
diff.SpillTime = s.SpillTime - other.SpillTime
diff.Write = s.Write - other.Write
diff.WriteTime = s.WriteTime - other.WriteTime
return diff
}

2
vendor/github.com/docker/swarmkit/agent/config.go generated vendored
View file

@ -1,12 +1,12 @@
package agent
import (
"github.com/boltdb/bolt"
"github.com/docker/go-events"
"github.com/docker/swarmkit/agent/exec"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/connectionbroker"
"github.com/pkg/errors"
bolt "go.etcd.io/bbolt"
"google.golang.org/grpc/credentials"
)

2
vendor/github.com/docker/swarmkit/agent/storage.go generated vendored
View file

@ -1,9 +1,9 @@
package agent
import (
"github.com/boltdb/bolt"
"github.com/docker/swarmkit/api"
"github.com/gogo/protobuf/proto"
bolt "go.etcd.io/bbolt"
)
// Layout:

2
vendor/github.com/docker/swarmkit/agent/worker.go generated vendored
View file

@ -3,12 +3,12 @@ package agent
import (
"sync"
"github.com/boltdb/bolt"
"github.com/docker/swarmkit/agent/exec"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/log"
"github.com/docker/swarmkit/watch"
"github.com/sirupsen/logrus"
bolt "go.etcd.io/bbolt"
"golang.org/x/net/context"
)

3
vendor/github.com/docker/swarmkit/api/deepcopy/copy.go generated vendored
View file

@ -47,6 +47,9 @@ func Copy(dst, src interface{}) {
case *types.BoolValue:
src := src.(*types.BoolValue)
*dst = *src
case *types.Int64Value:
src := src.(*types.Int64Value)
*dst = *src
case CopierFrom:
dst.CopyFrom(src)
default:

6
vendor/github.com/docker/swarmkit/api/dispatcher.pb.go generated vendored
View file

@ -1664,7 +1664,7 @@ func (p *raftProxyDispatcherServer) Session(r *SessionRequest, stream Dispatcher
}
streamWrapper := Dispatcher_SessionServerWrapper{
Dispatcher_SessionServer: stream,
ctx: ctx,
ctx: ctx,
}
return p.local.Session(r, streamWrapper)
}
@ -1785,7 +1785,7 @@ func (p *raftProxyDispatcherServer) Tasks(r *TasksRequest, stream Dispatcher_Tas
}
streamWrapper := Dispatcher_TasksServerWrapper{
Dispatcher_TasksServer: stream,
ctx: ctx,
ctx: ctx,
}
return p.local.Tasks(r, streamWrapper)
}
@ -1836,7 +1836,7 @@ func (p *raftProxyDispatcherServer) Assignments(r *AssignmentsRequest, stream Di
}
streamWrapper := Dispatcher_AssignmentsServerWrapper{
Dispatcher_AssignmentsServer: stream,
ctx: ctx,
ctx: ctx,
}
return p.local.Assignments(r, streamWrapper)
}

6
vendor/github.com/docker/swarmkit/api/logbroker.pb.go generated vendored
View file

@ -1335,7 +1335,7 @@ func (p *raftProxyLogsServer) SubscribeLogs(r *SubscribeLogsRequest, stream Logs
}
streamWrapper := Logs_SubscribeLogsServerWrapper{
Logs_SubscribeLogsServer: stream,
ctx: ctx,
ctx: ctx,
}
return p.local.SubscribeLogs(r, streamWrapper)
}
@ -1458,7 +1458,7 @@ func (p *raftProxyLogBrokerServer) ListenSubscriptions(r *ListenSubscriptionsReq
}
streamWrapper := LogBroker_ListenSubscriptionsServerWrapper{
LogBroker_ListenSubscriptionsServer: stream,
ctx: ctx,
ctx: ctx,
}
return p.local.ListenSubscriptions(r, streamWrapper)
}
@ -1509,7 +1509,7 @@ func (p *raftProxyLogBrokerServer) PublishLogs(stream LogBroker_PublishLogsServe
}
streamWrapper := LogBroker_PublishLogsServerWrapper{
LogBroker_PublishLogsServer: stream,
ctx: ctx,
ctx: ctx,
}
return p.local.PublishLogs(streamWrapper)
}

2
vendor/github.com/docker/swarmkit/api/raft.pb.go generated vendored
View file

@ -1746,7 +1746,7 @@ func (p *raftProxyRaftServer) StreamRaftMessage(stream Raft_StreamRaftMessageSer
}
streamWrapper := Raft_StreamRaftMessageServerWrapper{
Raft_StreamRaftMessageServer: stream,
ctx: ctx,
ctx: ctx,
}
return p.local.StreamRaftMessage(streamWrapper)
}

451
vendor/github.com/docker/swarmkit/api/specs.pb.go generated vendored
View file

@ -636,6 +636,12 @@ type ContainerSpec struct {
//
// https://docs.docker.com/engine/reference/commandline/run/#configure-namespaced-kernel-parameters-sysctls-at-runtime
Sysctls map[string]string `protobuf:"bytes,26,rep,name=sysctls" json:"sysctls,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
// Swap limit equal to memory plus swap: '-1' to enable unlimited swap
MemorySwap int64 `protobuf:"varint,27,opt,name=memory_swap,json=memorySwap,proto3" json:"memory_swap,omitempty"`
// Tune container memory swappiness (0 to 100) - if not specified, defaults
// to the container OS's default - generally 60, or the value predefined in
// the image; set to -1 to unset a previously set value
MemorySwappiness *google_protobuf4.Int64Value `protobuf:"bytes,28,opt,name=memory_swappiness,json=memorySwappiness" json:"memory_swappiness,omitempty"`
}
func (m *ContainerSpec) Reset() { *m = ContainerSpec{} }
@ -1197,6 +1203,10 @@ func (m *ContainerSpec) CopyFrom(src interface{}) {
}
}
if o.MemorySwappiness != nil {
m.MemorySwappiness = &google_protobuf4.Int64Value{}
deepcopy.Copy(m.MemorySwappiness, o.MemorySwappiness)
}
}
func (m *ContainerSpec_PullOptions) Copy() *ContainerSpec_PullOptions {
@ -2104,6 +2114,25 @@ func (m *ContainerSpec) MarshalTo(dAtA []byte) (int, error) {
i += copy(dAtA[i:], v)
}
}
if m.MemorySwap != 0 {
dAtA[i] = 0xd8
i++
dAtA[i] = 0x1
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.MemorySwap))
}
if m.MemorySwappiness != nil {
dAtA[i] = 0xe2
i++
dAtA[i] = 0x1
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.MemorySwappiness.Size()))
n25, err := m.MemorySwappiness.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n25
}
return i, nil
}
@ -2249,20 +2278,20 @@ func (m *NetworkSpec) MarshalTo(dAtA []byte) (int, error) {
dAtA[i] = 0xa
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Annotations.Size()))
n25, err := m.Annotations.MarshalTo(dAtA[i:])
n26, err := m.Annotations.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n25
i += n26
if m.DriverConfig != nil {
dAtA[i] = 0x12
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.DriverConfig.Size()))
n26, err := m.DriverConfig.MarshalTo(dAtA[i:])
n27, err := m.DriverConfig.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n26
i += n27
}
if m.Ipv6Enabled {
dAtA[i] = 0x18
@ -2288,11 +2317,11 @@ func (m *NetworkSpec) MarshalTo(dAtA []byte) (int, error) {
dAtA[i] = 0x2a
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.IPAM.Size()))
n27, err := m.IPAM.MarshalTo(dAtA[i:])
n28, err := m.IPAM.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n27
i += n28
}
if m.Attachable {
dAtA[i] = 0x30
@ -2315,11 +2344,11 @@ func (m *NetworkSpec) MarshalTo(dAtA []byte) (int, error) {
i++
}
if m.ConfigFrom != nil {
nn28, err := m.ConfigFrom.MarshalTo(dAtA[i:])
nn29, err := m.ConfigFrom.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += nn28
i += nn29
}
return i, nil
}
@ -2350,67 +2379,67 @@ func (m *ClusterSpec) MarshalTo(dAtA []byte) (int, error) {
dAtA[i] = 0xa
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Annotations.Size()))
n29, err := m.Annotations.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n29
dAtA[i] = 0x12
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.AcceptancePolicy.Size()))
n30, err := m.AcceptancePolicy.MarshalTo(dAtA[i:])
n30, err := m.Annotations.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n30
dAtA[i] = 0x1a
dAtA[i] = 0x12
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Orchestration.Size()))
n31, err := m.Orchestration.MarshalTo(dAtA[i:])
i = encodeVarintSpecs(dAtA, i, uint64(m.AcceptancePolicy.Size()))
n31, err := m.AcceptancePolicy.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n31
dAtA[i] = 0x22
dAtA[i] = 0x1a
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Raft.Size()))
n32, err := m.Raft.MarshalTo(dAtA[i:])
i = encodeVarintSpecs(dAtA, i, uint64(m.Orchestration.Size()))
n32, err := m.Orchestration.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n32
dAtA[i] = 0x2a
dAtA[i] = 0x22
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Dispatcher.Size()))
n33, err := m.Dispatcher.MarshalTo(dAtA[i:])
i = encodeVarintSpecs(dAtA, i, uint64(m.Raft.Size()))
n33, err := m.Raft.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n33
dAtA[i] = 0x32
dAtA[i] = 0x2a
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.CAConfig.Size()))
n34, err := m.CAConfig.MarshalTo(dAtA[i:])
i = encodeVarintSpecs(dAtA, i, uint64(m.Dispatcher.Size()))
n34, err := m.Dispatcher.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n34
dAtA[i] = 0x3a
dAtA[i] = 0x32
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.TaskDefaults.Size()))
n35, err := m.TaskDefaults.MarshalTo(dAtA[i:])
i = encodeVarintSpecs(dAtA, i, uint64(m.CAConfig.Size()))
n35, err := m.CAConfig.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n35
dAtA[i] = 0x42
dAtA[i] = 0x3a
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.EncryptionConfig.Size()))
n36, err := m.EncryptionConfig.MarshalTo(dAtA[i:])
i = encodeVarintSpecs(dAtA, i, uint64(m.TaskDefaults.Size()))
n36, err := m.TaskDefaults.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n36
dAtA[i] = 0x42
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.EncryptionConfig.Size()))
n37, err := m.EncryptionConfig.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n37
return i, nil
}
@ -2432,11 +2461,11 @@ func (m *SecretSpec) MarshalTo(dAtA []byte) (int, error) {
dAtA[i] = 0xa
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Annotations.Size()))
n37, err := m.Annotations.MarshalTo(dAtA[i:])
n38, err := m.Annotations.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n37
i += n38
if len(m.Data) > 0 {
dAtA[i] = 0x12
i++
@ -2447,21 +2476,21 @@ func (m *SecretSpec) MarshalTo(dAtA []byte) (int, error) {
dAtA[i] = 0x1a
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Templating.Size()))
n38, err := m.Templating.MarshalTo(dAtA[i:])
n39, err := m.Templating.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n38
i += n39
}
if m.Driver != nil {
dAtA[i] = 0x22
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Driver.Size()))
n39, err := m.Driver.MarshalTo(dAtA[i:])
n40, err := m.Driver.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n39
i += n40
}
return i, nil
}
@ -2484,11 +2513,11 @@ func (m *ConfigSpec) MarshalTo(dAtA []byte) (int, error) {
dAtA[i] = 0xa
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Annotations.Size()))
n40, err := m.Annotations.MarshalTo(dAtA[i:])
n41, err := m.Annotations.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n40
i += n41
if len(m.Data) > 0 {
dAtA[i] = 0x12
i++
@ -2499,11 +2528,11 @@ func (m *ConfigSpec) MarshalTo(dAtA []byte) (int, error) {
dAtA[i] = 0x1a
i++
i = encodeVarintSpecs(dAtA, i, uint64(m.Templating.Size()))
n41, err := m.Templating.MarshalTo(dAtA[i:])
n42, err := m.Templating.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n41
i += n42
}
return i, nil
}
@ -2829,6 +2858,13 @@ func (m *ContainerSpec) Size() (n int) {
n += mapEntrySize + 2 + sovSpecs(uint64(mapEntrySize))
}
}
if m.MemorySwap != 0 {
n += 2 + sovSpecs(uint64(m.MemorySwap))
}
if m.MemorySwappiness != nil {
l = m.MemorySwappiness.Size()
n += 2 + l + sovSpecs(uint64(l))
}
return n
}
@ -3188,6 +3224,8 @@ func (this *ContainerSpec) String() string {
`Isolation:` + fmt.Sprintf("%v", this.Isolation) + `,`,
`PidsLimit:` + fmt.Sprintf("%v", this.PidsLimit) + `,`,
`Sysctls:` + mapStringForSysctls + `,`,
`MemorySwap:` + fmt.Sprintf("%v", this.MemorySwap) + `,`,
`MemorySwappiness:` + strings.Replace(fmt.Sprintf("%v", this.MemorySwappiness), "Int64Value", "google_protobuf4.Int64Value", 1) + `,`,
`}`,
}, "")
return s
@ -5454,6 +5492,58 @@ func (m *ContainerSpec) Unmarshal(dAtA []byte) error {
}
m.Sysctls[mapkey] = mapvalue
iNdEx = postIndex
case 27:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field MemorySwap", wireType)
}
m.MemorySwap = 0
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowSpecs
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
m.MemorySwap |= (int64(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
case 28:
if wireType != 2 {
return fmt.Errorf("proto: wrong wireType = %d for field MemorySwappiness", wireType)
}
var msglen int
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowSpecs
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
msglen |= (int(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
if msglen < 0 {
return ErrInvalidLengthSpecs
}
postIndex := iNdEx + msglen
if postIndex > l {
return io.ErrUnexpectedEOF
}
if m.MemorySwappiness == nil {
m.MemorySwappiness = &google_protobuf4.Int64Value{}
}
if err := m.MemorySwappiness.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
return err
}
iNdEx = postIndex
default:
iNdEx = preIndex
skippy, err := skipSpecs(dAtA[iNdEx:])
@ -6765,141 +6855,144 @@ var (
func init() { proto.RegisterFile("github.com/docker/swarmkit/api/specs.proto", fileDescriptorSpecs) }
var fileDescriptorSpecs = []byte{
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}

8
vendor/github.com/docker/swarmkit/api/specs.proto generated vendored
View file

@ -333,6 +333,14 @@ message ContainerSpec {
//
// https://docs.docker.com/engine/reference/commandline/run/#configure-namespaced-kernel-parameters-sysctls-at-runtime
map<string, string> sysctls = 26;
// Swap limit equal to memory plus swap: '-1' to enable unlimited swap
int64 memory_swap = 27;
// Tune container memory swappiness (0 to 100) - if not specified, defaults
// to the container OS's default - generally 60, or the value predefined in
// the image; set to -1 to unset a previously set value
google.protobuf.Int64Value memory_swappiness = 28;
}
// EndpointSpec defines the properties that can be configured to

654
vendor/github.com/docker/swarmkit/api/types.pb.go generated vendored
View file

@ -213,20 +213,23 @@ func (NodeStatus_State) EnumDescriptor() ([]byte, []int) { return fileDescriptor
type Mount_MountType int32
const (
MountTypeBind Mount_MountType = 0
MountTypeVolume Mount_MountType = 1
MountTypeTmpfs Mount_MountType = 2
MountTypeBind Mount_MountType = 0
MountTypeVolume Mount_MountType = 1
MountTypeTmpfs Mount_MountType = 2
MountTypeNamedPipe Mount_MountType = 3
)
var Mount_MountType_name = map[int32]string{
0: "BIND",
1: "VOLUME",
2: "TMPFS",
3: "NPIPE",
}
var Mount_MountType_value = map[string]int32{
"BIND": 0,
"VOLUME": 1,
"TMPFS": 2,
"NPIPE": 3,
}
func (x Mount_MountType) String() string {
@ -591,7 +594,7 @@ var MaybeEncryptedRecord_Algorithm_name = map[int32]string{
2: "FERNET_AES_128_CBC",
}
var MaybeEncryptedRecord_Algorithm_value = map[string]int32{
"NONE": 0,
"NONE": 0,
"SECRETBOX_SALSA20_POLY1305": 1,
"FERNET_AES_128_CBC": 2,
}
@ -17080,325 +17083,326 @@ var (
func init() { proto.RegisterFile("github.com/docker/swarmkit/api/types.proto", fileDescriptorTypes) }
var fileDescriptorTypes = []byte{
// 5116 bytes of a gzipped FileDescriptorProto
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0x4d, 0xc4, 0xba, 0xf7, 0x73, 0x50, 0x08, 0x23, 0x5d, 0xb4, 0x0e, 0xf9, 0x17, 0x5d, 0xfc, 0x4c,
0xc3, 0xca, 0x82, 0xb0, 0x72, 0xc8, 0x79, 0x21, 0x72, 0x94, 0x2a, 0x2c, 0xee, 0xd4, 0x3b, 0xf5,
0xa7, 0x1a, 0x0e, 0x4b, 0xee, 0x21, 0x40, 0x86, 0x6b, 0x15, 0x45, 0x76, 0x10, 0xe9, 0x6c, 0xac,
0xfd, 0xf0, 0x27, 0xeb, 0x0b, 0x3f, 0xfe, 0xc9, 0xfa, 0xc2, 0x27, 0xe7, 0xeb, 0xa9, 0x1f, 0x9e,
0xaf, 0xa7, 0xfe, 0xf6, 0x7c, 0x3d, 0xf5, 0x2f, 0xe7, 0xeb, 0xa9, 0xbd, 0x3c, 0xbf, 0x54, 0x1e,
0xff, 0x4f, 0x00, 0x00, 0x00, 0xff, 0xff, 0xac, 0xef, 0xe8, 0x11, 0x9e, 0x32, 0x00, 0x00,
}

1
vendor/github.com/docker/swarmkit/api/types.proto generated vendored
View file

@ -202,6 +202,7 @@ message Mount {
BIND = 0 [(gogoproto.enumvalue_customname) = "MountTypeBind"]; // Bind mount host dir
VOLUME = 1 [(gogoproto.enumvalue_customname) = "MountTypeVolume"]; // Remote storage volumes
TMPFS = 2 [(gogoproto.enumvalue_customname) = "MountTypeTmpfs"]; // Mount a tmpfs
NPIPE = 3 [(gogoproto.enumvalue_customname) = "MountTypeNamedPipe"]; // Windows named pipes
}
// Type defines the nature of the mount.

40
vendor/github.com/docker/swarmkit/manager/dispatcher/dispatcher.go generated vendored
View file

@ -342,6 +342,39 @@ func (d *Dispatcher) Stop() error {
d.cancel()
d.mu.Unlock()
d.processUpdatesLock.Lock()
// when we called d.cancel(), there may be routines, servicing RPC calls to
// the (*Dispatcher).Session endpoint, currently waiting at
// d.processUpdatesCond.Wait() inside of (*Dispatcher).markNodeReady().
//
// these routines are typically woken by a call to
// d.processUpdatesCond.Broadcast() at the end of
// (*Dispatcher).processUpdates() as part of the main Run loop. However,
// when d.cancel() is called, the main Run loop is stopped, and there are
// no more opportunties for processUpdates to be called. Any calls to
// Session would be stuck waiting on a call to Broadcast that will never
// come.
//
// Further, because the rpcRW write lock cannot be obtained until every RPC
// has exited and released its read lock, then Stop would be stuck forever.
//
// To avoid this case, we acquire the processUpdatesLock (so that no new
// waits can start) and then do a Broadcast to wake all of the waiting
// routines. Further, if any routines are waiting in markNodeReady to
// acquire this lock, but not yet waiting, those routines will check the
// context cancelation, see the context is canceled, and exit before doing
// the Wait.
//
// This call to Broadcast must occur here. If we called Broadcast before
// context cancelation, then some new routines could enter the wait. If we
// call Broadcast after attempting to acquire the rpcRW lock, we will be
// deadlocked. If we do this Broadcast without obtaining this lock (as is
// done in the processUpdates method), then it would be possible for that
// broadcast to come after the context cancelation check in markNodeReady,
// but before the call to Wait.
d.processUpdatesCond.Broadcast()
d.processUpdatesLock.Unlock()
// The active nodes list can be cleaned out only when all
// existing RPCs have finished.
// RPCs that start after rpcRW.Unlock() should find the context
@ -351,13 +384,6 @@ func (d *Dispatcher) Stop() error {
d.downNodes.Clean()
d.rpcRW.Unlock()
d.processUpdatesLock.Lock()
// In case there are any waiters. There is no chance of any starting
// after this point, because they check if the context is canceled
// before waiting.
d.processUpdatesCond.Broadcast()
d.processUpdatesLock.Unlock()
d.clusterUpdateQueue.Close()
// TODO(anshul): This use of Wait() could be unsafe.

4
vendor/github.com/docker/swarmkit/manager/scheduler/nodeinfo.go generated vendored
View file

@ -45,8 +45,8 @@ type NodeInfo struct {
func newNodeInfo(n *api.Node, tasks map[string]*api.Task, availableResources api.Resources) NodeInfo {
nodeInfo := NodeInfo{
Node: n,
Tasks: make(map[string]*api.Task),
Node: n,
Tasks: make(map[string]*api.Task),
ActiveTasksCountByService: make(map[string]int),
AvailableResources: availableResources.Copy(),
usedHostPorts: make(map[hostPortSpec]struct{}),

2
vendor/github.com/docker/swarmkit/node/node.go generated vendored
View file

@ -17,7 +17,6 @@ import (
"github.com/docker/swarmkit/ca/keyutils"
"github.com/docker/swarmkit/identity"
"github.com/boltdb/bolt"
"github.com/docker/docker/pkg/plugingetter"
metrics "github.com/docker/go-metrics"
"github.com/docker/swarmkit/agent"
@ -35,6 +34,7 @@ import (
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
bolt "go.etcd.io/bbolt"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"

2
vendor/github.com/docker/swarmkit/vendor.conf generated vendored
View file

@ -43,7 +43,6 @@ github.com/davecgh/go-spew 346938d642f2ec3594ed81d874461961cd0faa76 # v1.1.0
github.com/Microsoft/go-winio v0.4.8
github.com/sirupsen/logrus v1.0.3
github.com/beorn7/perks 4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9
github.com/boltdb/bolt fff57c100f4dea1905678da7e90d92429dff2904
github.com/cloudflare/cfssl 1.3.2
github.com/dustin/go-humanize 8929fe90cee4b2cb9deb468b51fb34eba64d1bf0
github.com/fernet/fernet-go 1b2437bc582b3cfbb341ee5a29f8ef5b42912ff2
@ -60,6 +59,7 @@ github.com/rcrowley/go-metrics 51425a2415d21afadfd55cd93432c0bc69e9598d
github.com/spf13/cobra 8e91712f174ced10270cf66615e0a9127e7c4de5
github.com/spf13/pflag 7f60f83a2c81bc3c3c0d5297f61ddfa68da9d3b7
github.com/stretchr/testify v1.1.4
go.etcd.io/bbolt v1.3.1-etcd.8
golang.org/x/crypto 1a580b3eff7814fc9b40602fd35256c63b50f491
golang.org/x/net 0ed95abb35c445290478a5348a7b38bb154135fd
golang.org/x/sys 37707fdb30a5b38865cfb95e5aab41707daec7fd