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upgrade levelqueue to 0.1.0 (#9192)

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Lunny Xiao 2019-11-28 23:37:33 +08:00 • committed by GitHub
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3
vendor/github.com/lunny/levelqueue/.gitignore generated vendored
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queue/
queue_pop/
queue_push/

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vendor/github.com/lunny/levelqueue/LICENSE generated vendored
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Copyright (c) 2019 Lunny Xiao
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/lunny/levelqueue/README.md generated vendored
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# levelqueue
Level queue is a simple queue golang library base on go-leveldb.
[![CircleCI](https://circleci.com/gh/lunny/levelqueue.svg?style=shield)](https://circleci.com/gh/lunny/levelqueue)
[![codecov](https://codecov.io/gh/lunny/levelqueue/branch/master/graph/badge.svg)](https://codecov.io/gh/lunny/levelqueue)
[![](https://goreportcard.com/badge/github.com/lunny/levelqueue)](https://goreportcard.com/report/github.com/lunny/levelqueue)
## Installation
```
go get github.com/lunny/levelqueue
```
## Usage
```Go
queue, err := levelqueue.Open("./queue")
err = queue.RPush([]byte("test"))
data, err = queue.LPop()
```

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vendor/github.com/lunny/levelqueue/error.go generated vendored
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// Copyright 2019 Lunny Xiao. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package levelqueue
import "errors"
var (
// ErrNotFound means no element in queue
ErrNotFound = errors.New("no key found")
)

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vendor/github.com/lunny/levelqueue/go.mod generated vendored
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module github.com/lunny/levelqueue
require github.com/syndtr/goleveldb v0.0.0-20190203031304-2f17a3356c66

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vendor/github.com/lunny/levelqueue/go.sum generated vendored
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github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db h1:woRePGFeVFfLKN/pOkfl+p/TAqKOfFu+7KPlMVpok/w=
github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
github.com/syndtr/goleveldb v0.0.0-20190203031304-2f17a3356c66 h1:AwmkkZT+TucFotNCL+aNJ/0KCMsRtlXN9fs8uoOMSRk=
github.com/syndtr/goleveldb v0.0.0-20190203031304-2f17a3356c66/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpPAyBWyWuQ=
golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

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// Copyright 2019 Lunny Xiao. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package levelqueue
import (
"bytes"
"encoding/binary"
"sync"
"github.com/syndtr/goleveldb/leveldb"
)
// Queue defines a queue struct
type Queue struct {
db *leveldb.DB
highLock sync.Mutex
lowLock sync.Mutex
low int64
high int64
}
// Open opens a queue object or create it if not exist
func Open(dataDir string) (*Queue, error) {
db, err := leveldb.OpenFile(dataDir, nil)
if err != nil {
return nil, err
}
var queue = &Queue{
db: db,
}
queue.low, err = queue.readID(lowKey)
if err == leveldb.ErrNotFound {
queue.low = 1
err = db.Put(lowKey, id2bytes(1), nil)
}
if err != nil {
return nil, err
}
queue.high, err = queue.readID(highKey)
if err == leveldb.ErrNotFound {
err = db.Put(highKey, id2bytes(0), nil)
}
if err != nil {
return nil, err
}
return queue, nil
}
func (queue *Queue) readID(key []byte) (int64, error) {
bs, err := queue.db.Get(key, nil)
if err != nil {
return 0, err
}
return bytes2id(bs)
}
var (
lowKey = []byte("low")
highKey = []byte("high")
)
func (queue *Queue) highincrement() (int64, error) {
id := queue.high + 1
queue.high = id
err := queue.db.Put(highKey, id2bytes(queue.high), nil)
if err != nil {
queue.high = queue.high - 1
return 0, err
}
return id, nil
}
func (queue *Queue) highdecrement() (int64, error) {
queue.high = queue.high - 1
err := queue.db.Put(highKey, id2bytes(queue.high), nil)
if err != nil {
queue.high = queue.high + 1
return 0, err
}
return queue.high, nil
}
func (queue *Queue) lowincrement() (int64, error) {
queue.low = queue.low + 1
err := queue.db.Put(lowKey, id2bytes(queue.low), nil)
if err != nil {
queue.low = queue.low - 1
return 0, err
}
return queue.low, nil
}
func (queue *Queue) lowdecrement() (int64, error) {
queue.low = queue.low - 1
err := queue.db.Put(lowKey, id2bytes(queue.low), nil)
if err != nil {
queue.low = queue.low + 1
return 0, err
}
return queue.low, nil
}
// Len returns the length of the queue
func (queue *Queue) Len() int64 {
queue.lowLock.Lock()
queue.highLock.Lock()
l := queue.high - queue.low + 1
queue.highLock.Unlock()
queue.lowLock.Unlock()
return l
}
func id2bytes(id int64) []byte {
var buf = make([]byte, 8)
binary.PutVarint(buf, id)
return buf
}
func bytes2id(b []byte) (int64, error) {
return binary.ReadVarint(bytes.NewReader(b))
}
// RPush pushes a data from right of queue
func (queue *Queue) RPush(data []byte) error {
queue.highLock.Lock()
id, err := queue.highincrement()
if err != nil {
queue.highLock.Unlock()
return err
}
err = queue.db.Put(id2bytes(id), data, nil)
queue.highLock.Unlock()
return err
}
// LPush pushes a data from left of queue
func (queue *Queue) LPush(data []byte) error {
queue.highLock.Lock()
id, err := queue.lowdecrement()
if err != nil {
queue.highLock.Unlock()
return err
}
err = queue.db.Put(id2bytes(id), data, nil)
queue.highLock.Unlock()
return err
}
// RPop pop a data from right of queue
func (queue *Queue) RPop() ([]byte, error) {
queue.highLock.Lock()
currentID := queue.high
res, err := queue.db.Get(id2bytes(currentID), nil)
if err != nil {
queue.highLock.Unlock()
if err == leveldb.ErrNotFound {
return nil, ErrNotFound
}
return nil, err
}
_, err = queue.highdecrement()
if err != nil {
queue.highLock.Unlock()
return nil, err
}
err = queue.db.Delete(id2bytes(currentID), nil)
queue.highLock.Unlock()
if err != nil {
return nil, err
}
return res, nil
}
// LPop pop a data from left of queue
func (queue *Queue) LPop() ([]byte, error) {
queue.lowLock.Lock()
currentID := queue.low
res, err := queue.db.Get(id2bytes(currentID), nil)
if err != nil {
queue.lowLock.Unlock()
if err == leveldb.ErrNotFound {
return nil, ErrNotFound
}
return nil, err
}
_, err = queue.lowincrement()
if err != nil {
return nil, err
}
err = queue.db.Delete(id2bytes(currentID), nil)
queue.lowLock.Unlock()
if err != nil {
return nil, err
}
return res, nil
}
// Close closes the queue
func (queue *Queue) Close() error {
err := queue.db.Close()
queue.db = nil
return err
}