upgrade levelqueue to 0.1.0 (#9192)

vendor/gitea.com/lunny/levelqueue/.drone.yml

@@ -0,0 +1,23 @@
+---
+kind: pipeline
+name: test
+
+workspace:
+  base: /go
+  path: src/gitea.com/lunny/levelqueue
+
+steps:
+- name: test
+  pull: default
+  image: golang:1.13
+  commands:
+  - go get -t -d -v ./...
+  - go build -v
+  - go test -v -race -coverprofile=coverage.txt -covermode=atomic
+  environment:
+    GO111MODULE: "on"
+    GOPROXY: https://goproxy.cn
+  when:
+    event:
+    - push
+    - pull_request

vendor/gitea.com/lunny/levelqueue/.gitignore

@@ -0,0 +1,3 @@
+queue/
+queue_pop/
+queue_push/

vendor/gitea.com/lunny/levelqueue/LICENSE

@@ -0,0 +1,19 @@
+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.

vendor/gitea.com/lunny/levelqueue/README.md

@@ -0,0 +1,28 @@
+# levelqueue
+
+Level queue is a simple queue golang library base on go-leveldb.
+
+[![Build Status](https://drone.gitea.com/api/badges/lunny/levelqueue/status.svg)](https://drone.gitea.com/lunny/levelqueue)  [![](http://gocover.io/_badge/gitea.com/lunny/levelqueue)](http://gocover.io/gitea.com/lunny/levelqueue)
+[![](https://goreportcard.com/badge/gitea.com/lunny/levelqueue)](https://goreportcard.com/report/gitea.com/lunny/levelqueue)
+
+## Installation
+
+```
+go get gitea.com/lunny/levelqueue
+```
+
+## Usage
+
+```Go
+queue, err := levelqueue.Open("./queue")
+
+err = queue.RPush([]byte("test"))
+
+// pop an element from left of the queue
+data, err = queue.LPop()
+
+// if handle success, element will be pop, otherwise it will be keep
+queue.LHandle(func(dt []byte) error{
+    return nil
+})
+```

vendor/gitea.com/lunny/levelqueue/error.go

@@ -0,0 +1,12 @@
+// 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")
+)

vendor/gitea.com/lunny/levelqueue/go.mod

@@ -0,0 +1,8 @@
+module gitea.com/lunny/levelqueue
+
+require (
+	github.com/stretchr/testify v1.3.0
+	github.com/syndtr/goleveldb v0.0.0-20190203031304-2f17a3356c66
+)
+
+go 1.13

vendor/gitea.com/lunny/levelqueue/go.sum

@@ -0,0 +1,38 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
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+github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
+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 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
+github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
+github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+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 h1:nTDtHvHSdCn1m6ITfMRqtOd/9+7a3s8RBNOZ3eYZzJA=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e h1:o3PsSEY8E4eXWkXrIP9YJALUkVZqzHJT5DOasTyn8Vs=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
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+gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
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vendor/gitea.com/lunny/levelqueue/queue.go

@@ -0,0 +1,263 @@
+// 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.lowLock.Lock()
+	id, err := queue.lowdecrement()
+	if err != nil {
+		queue.lowLock.Unlock()
+		return err
+	}
+	err = queue.db.Put(id2bytes(id), data, nil)
+	queue.lowLock.Unlock()
+	return err
+}
+
+// RPop pop a data from right of queue
+func (queue *Queue) RPop() ([]byte, error) {
+	queue.highLock.Lock()
+	defer queue.highLock.Unlock()
+	currentID := queue.high
+
+	res, err := queue.db.Get(id2bytes(currentID), nil)
+	if err != nil {
+		if err == leveldb.ErrNotFound {
+			return nil, ErrNotFound
+		}
+		return nil, err
+	}
+
+	_, err = queue.highdecrement()
+	if err != nil {
+		return nil, err
+	}
+
+	err = queue.db.Delete(id2bytes(currentID), nil)
+	if err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+// RHandle receives a user callback function to handle the right element of the queue, if function return nil, then delete the element, otherwise keep the element.
+func (queue *Queue) RHandle(h func([]byte) error) error {
+	queue.highLock.Lock()
+	defer queue.highLock.Unlock()
+	currentID := queue.high
+
+	res, err := queue.db.Get(id2bytes(currentID), nil)
+	if err != nil {
+		if err == leveldb.ErrNotFound {
+			return ErrNotFound
+		}
+		return err
+	}
+
+	if err = h(res); err != nil {
+		return err
+	}
+
+	_, err = queue.highdecrement()
+	if err != nil {
+		return err
+	}
+
+	return queue.db.Delete(id2bytes(currentID), nil)
+}
+
+// LPop pop a data from left of queue
+func (queue *Queue) LPop() ([]byte, error) {
+	queue.lowLock.Lock()
+	defer queue.lowLock.Unlock()
+	currentID := queue.low
+
+	res, err := queue.db.Get(id2bytes(currentID), nil)
+	if err != nil {
+		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)
+	if err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+// LHandle receives a user callback function to handle the left element of the queue, if function return nil, then delete the element, otherwise keep the element.
+func (queue *Queue) LHandle(h func([]byte) error) error {
+	queue.lowLock.Lock()
+	defer queue.lowLock.Unlock()
+	currentID := queue.low
+
+	res, err := queue.db.Get(id2bytes(currentID), nil)
+	if err != nil {
+		if err == leveldb.ErrNotFound {
+			return ErrNotFound
+		}
+		return err
+	}
+
+	if err = h(res); err != nil {
+		return err
+	}
+
+	_, err = queue.lowincrement()
+	if err != nil {
+		return err
+	}
+
+	return queue.db.Delete(id2bytes(currentID), nil)
+}
+
+// Close closes the queue
+func (queue *Queue) Close() error {
+	err := queue.db.Close()
+	queue.db = nil
+	return err
+}