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uQueue.go
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uQueue.go
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package queue
import (
"bytes"
"encoding/binary"
"encoding/gob"
"errors"
"log"
"strconv"
"strings"
"sync"
"time"
"github.com/buaazp/uq/store"
. "github.com/buaazp/uq/utils"
"github.com/coreos/go-etcd/etcd"
)
func init() {
gob.Register(&unitedQueueStore{})
}
const (
StorageKeyWord string = "UnitedQueueKey"
BgBackupInterval time.Duration = 10 * time.Second // 备份间隔
BgCleanInterval time.Duration = 20 * time.Second // 清理间隔
BgCleanTimeout time.Duration = 5 * time.Second // 清理超时
KeyTopicStore string = ":store"
KeyTopicHead string = ":head"
KeyTopicTail string = ":tail"
KeyLineStore string = ":store"
KeyLineHead string = ":head"
KeyLineRecycle string = ":recycle"
KeyLineInflight string = ":inflight"
)
type UnitedQueue struct {
topics map[string]*topic // 包含一个主题集合
topicsLock sync.RWMutex
storage store.Storage // 包含一个存储实现
// etcd 相关
etcdLock sync.RWMutex
selfAddr string
etcdClient *etcd.Client
etcdKey string
etcdStop chan bool
wg sync.WaitGroup
}
// topic列表
type unitedQueueStore struct {
Topics []string
}
func NewUnitedQueue(storage store.Storage, ip string, port int, etcdServers []string, etcdKey string) (*UnitedQueue, error) {
// 主题 uTopic.topic
topics := make(map[string]*topic)
etcdStop := make(chan bool)
uq := new(UnitedQueue)
uq.topics = topics
uq.storage = storage
uq.etcdStop = etcdStop
// 启动etcdServer
if len(etcdServers) > 0 {
selfAddr := Addrcat(ip, port)
uq.selfAddr = selfAddr
etcdClient := etcd.NewClient(etcdServers)
uq.etcdClient = etcdClient
uq.etcdKey = etcdKey
}
err := uq.loadQueue()
if err != nil {
return nil, err
}
go uq.etcdRun()
return uq, nil
}
// set k/v
func (u *UnitedQueue) setData(key string, data []byte) error {
err := u.storage.Set(key, data)
if err != nil {
// log.Printf("key[%s] set data error: %s", key, err)
return NewError(
ErrInternalError,
err.Error(),
)
}
return nil
}
// get k
func (u *UnitedQueue) getData(key string) ([]byte, error) {
data, err := u.storage.Get(key)
if err != nil {
// log.Printf("key[%s] get data error: %s", key, err)
return nil, NewError(
ErrInternalError,
err.Error(),
)
}
return data, nil
}
// delete k
func (u *UnitedQueue) delData(key string) error {
err := u.storage.Del(key)
if err != nil {
// log.Printf("key[%s] del data error: %s", key, err)
return NewError(
ErrInternalError,
err.Error(),
)
}
return nil
}
/**
* Quere.topics持久化,topic.line持久化
*/
func (u *UnitedQueue) exportTopics() error {
u.topicsLock.RLock()
defer u.topicsLock.RUnlock()
for _, t := range u.topics {
err := t.exportLines()
if err != nil {
log.Printf("topic[%s] export lines error: %s", t.name, err)
continue
}
t.linesLock.RLock()
err = t.exportTopic()
t.linesLock.RUnlock()
if err != nil {
log.Printf("topic[%s] export error: %s", t.name, err)
continue
}
}
// log.Printf("export all topics succ.")
return nil
}
// 赋值出来UnitedQueue中的所有topics组成一个列表,放置到unitedQueueStore中
func (u *UnitedQueue) genQueueStore() *unitedQueueStore {
topics := make([]string, len(u.topics))
i := 0
for topicName, _ := range u.topics {
topics[i] = topicName
i++
}
qs := new(unitedQueueStore)
qs.Topics = topics
return qs
}
// 将所有的topic持久化到storage中
// 服务器重新启动时需要加载数据时就从中
func (u *UnitedQueue) exportQueue() error {
// log.Printf("start export queue...")
queueStoreValue := u.genQueueStore()
buffer := bytes.NewBuffer(nil)
enc := gob.NewEncoder(buffer)
err := enc.Encode(queueStoreValue)
if err != nil {
return err
}
err = u.setData(StorageKeyWord, buffer.Bytes())
if err != nil {
return err
}
// log.Printf("united queue export finisded.")
return nil
}
// 加载出来topic的信息,topicStore包含着一个line列表
func (u *UnitedQueue) loadTopic(topicName string, topicStoreValue topicStore) (*topic, error) {
t := new(topic)
t.name = topicName
t.q = u
t.quit = make(chan bool)
// 头
t.headKey = topicName + KeyTopicHead
topicHeadData, err := u.getData(t.headKey)
if err != nil {
return nil, err
}
t.head = binary.LittleEndian.Uint64(topicHeadData)
// 尾
t.tailKey = topicName + KeyTopicTail
topicTailData, err := u.getData(t.tailKey)
if err != nil {
return nil, err
}
t.tail = binary.LittleEndian.Uint64(topicTailData)
lines := make(map[string]*line)
for _, lineName := range topicStoreValue.Lines {
// 每条line一个store key
lineStoreKey := topicName + "/" + lineName
lineStoreData, err := u.getData(lineStoreKey)
if err != nil {
return nil, err
}
if len(lineStoreData) == 0 {
return nil, errors.New("line backup data missing: " + lineStoreKey)
}
var lineStoreValue lineStore
dec3 := gob.NewDecoder(bytes.NewBuffer(lineStoreData))
if e := dec3.Decode(&lineStoreValue); e == nil {
// 加载line的信息
l, err := t.loadLine(lineName, lineStoreValue)
if err != nil {
continue
}
lines[lineName] = l
// log.Printf("line[%s] load succ.", lineStoreKey)
}
}
t.lines = lines
u.registerTopic(t.name)
t.start()
// log.Printf("topic[%s] load succ.", topicName)
// log.Printf("topic: %v", t)
return t, nil
}
// 加载queue中的所有的topic,加载topic时加载每个topic的line
func (u *UnitedQueue) loadQueue() error {
// 对应exportQueue,将持久化到store中的topic全部load出来
unitedQueueStoreData, err := u.getData(StorageKeyWord)
if err != nil {
// log.Printf("storage not existed: %s", err)
return nil
}
if len(unitedQueueStoreData) > 0 {
var unitedQueueStoreValue unitedQueueStore
// 反序列化
dec := gob.NewDecoder(bytes.NewBuffer(unitedQueueStoreData))
if e := dec.Decode(&unitedQueueStoreValue); e == nil {
for _, topicName := range unitedQueueStoreValue.Topics {
// 遍历所有的topic
topicStoreData, err := u.getData(topicName)
if err != nil {
return err
}
if len(topicStoreData) == 0 {
return errors.New("topic backup data missing: " + topicName)
}
var topicStoreValue topicStore
dec2 := gob.NewDecoder(bytes.NewBuffer(topicStoreData))
if e := dec2.Decode(&topicStoreValue); e == nil {
t, err := u.loadTopic(topicName, topicStoreValue)
if err != nil {
return err
}
u.topicsLock.Lock()
u.topics[topicName] = t
u.topicsLock.Unlock()
}
}
}
}
// log.Printf("united queue load finisded.")
// log.Printf("u.topics: %v", u.topics)
return nil
}
/**
* 创建一个topic
* @param {[type]} u *UnitedQueue) newTopic(name string) (*topic, error [description]
* @return {[type]} [description]
*/
func (u *UnitedQueue) newTopic(name string) (*topic, error) {
lines := make(map[string]*line)
t := new(topic)
t.name = name
t.lines = lines
t.head = 0
t.headKey = name + KeyTopicHead
t.tail = 0
t.tailKey = name + KeyTopicTail
t.q = u
t.quit = make(chan bool)
err := t.exportHead()
if err != nil {
return nil, err
}
err = t.exportTail()
if err != nil {
return nil, err
}
t.start()
return t, nil
}
func (u *UnitedQueue) createTopic(name string, fromEtcd bool) error {
u.topicsLock.RLock()
_, ok := u.topics[name]
u.topicsLock.RUnlock()
if ok {
return NewError(
ErrTopicExisted,
`queue createTopic`,
)
}
t, err := u.newTopic(name)
if err != nil {
return err
}
u.topicsLock.Lock()
defer u.topicsLock.Unlock()
u.topics[name] = t
// 数据立马落地存储
err = u.exportQueue()
if err != nil {
t.remove()
delete(u.topics, name)
return err
}
if !fromEtcd {
u.registerTopic(t.name)
}
log.Printf("topic[%s] created.", name)
return nil
}
/**
* create topic/line
* topic/line key
* rec 确认
*/
func (u *UnitedQueue) create(key, rec string, fromEtcd bool) error {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
var topicName, lineName string
var err error
parts := strings.Split(key, "/")
if len(parts) < 1 || len(parts) > 2 {
return NewError(
ErrBadKey,
`create key parts error: `+ItoaQuick(len(parts)),
)
}
topicName = parts[0]
if topicName == "" {
return NewError(
ErrBadKey,
`create topic is nil`,
)
}
if len(parts) == 2 {
lineName = parts[1]
var recycle time.Duration
if rec != "" {
recycle, err = time.ParseDuration(rec)
if err != nil {
return NewError(
ErrBadRequest,
err.Error(),
)
}
}
u.topicsLock.RLock()
t, ok := u.topics[topicName]
u.topicsLock.RUnlock()
if !ok {
return NewError(
ErrTopicNotExisted,
`queue create`,
)
}
err = t.createLine(lineName, recycle, fromEtcd)
if err != nil {
// log.Printf("create line[%s] error: %s", lineName, err)
return err
}
} else {
err = u.createTopic(topicName, fromEtcd)
if err != nil {
// log.Printf("create topic[%s] error: %s", topicName, err)
return err
}
}
return err
}
/**
*
*/
func (u *UnitedQueue) Create(key, rec string) error {
return u.create(key, rec, false)
}
/**
* push 数据到topic
*/
func (u *UnitedQueue) Push(key string, data []byte) error {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
if len(data) <= 0 {
return NewError(
ErrBadRequest,
`message has no content`,
)
}
u.topicsLock.RLock()
t, ok := u.topics[key]
u.topicsLock.RUnlock()
if !ok {
return NewError(
ErrTopicNotExisted,
`queue push`,
)
}
return t.push(data)
}
/**
* 一次push多个数据
*/
func (u *UnitedQueue) MultiPush(key string, datas [][]byte) error {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
for i, data := range datas {
if len(data) <= 0 {
cause := "message " + strconv.Itoa(i) + " has no content"
return NewError(
ErrBadRequest,
cause,
)
}
}
u.topicsLock.RLock()
t, ok := u.topics[key]
u.topicsLock.RUnlock()
if !ok {
return NewError(
ErrTopicNotExisted,
`queue multiPush`,
)
}
return t.mPush(datas)
}
/**
* pop topic/line
* 调用topic.pop,接着调用line.pop
* @param {[type]} u *UnitedQueue) Pop(key string) (string, []byte, error [description]
* @return {[type]} [description]
*/
func (u *UnitedQueue) Pop(key string) (string, []byte, error) {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
parts := strings.Split(key, "/")
if len(parts) != 2 {
return "", nil, NewError(
ErrBadKey,
`pop key parts error: `+ItoaQuick(len(parts)),
)
}
tName := parts[0] // topic name
lName := parts[1] // line name
u.topicsLock.RLock()
t, ok := u.topics[tName]
u.topicsLock.RUnlock()
if !ok {
// log.Printf("topic[%s] not existed.", tName)
return "", nil, NewError(
ErrTopicNotExisted,
`queue pop`,
)
}
id, data, err := t.pop(lName)
if err != nil {
return "", nil, err
}
return Acatui(key, "/", id), data, nil
}
func (u *UnitedQueue) MultiPop(key string, n int) ([]string, [][]byte, error) {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
parts := strings.Split(key, "/")
if len(parts) != 2 {
return nil, nil, NewError(
ErrBadKey,
`mPop key parts error: `+ItoaQuick(len(parts)),
)
}
tName := parts[0]
lName := parts[1]
u.topicsLock.RLock()
t, ok := u.topics[tName]
u.topicsLock.RUnlock()
if !ok {
// log.Printf("topic[%s] not existed.", tName)
return nil, nil, NewError(
ErrTopicNotExisted,
`queue multiPop`,
)
}
ids, datas, err := t.mPop(lName, n)
if err != nil {
return nil, nil, err
}
keys := make([]string, len(ids))
for i, id := range ids {
keys[i] = Acatui(key, "/", id)
}
return keys, datas, nil
}
func (u *UnitedQueue) Confirm(key string) error {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
var topicName, lineName string
var id uint64
var err error
parts := strings.Split(key, "/")
if len(parts) != 3 {
return NewError(
ErrBadKey,
`confirm key parts error: `+ItoaQuick(len(parts)),
)
} else {
topicName = parts[0]
lineName = parts[1]
id, err = strconv.ParseUint(parts[2], 10, 0)
if err != nil {
return NewError(
ErrBadKey,
`confirm key parse id error: `+err.Error(),
)
}
}
u.topicsLock.RLock()
t, ok := u.topics[topicName]
u.topicsLock.RUnlock()
if !ok {
// log.Printf("topic[%s] not existed.", topicName)
return NewError(
ErrTopicNotExisted,
`queue confirm`,
)
}
return t.confirm(lineName, id)
}
func (u *UnitedQueue) MultiConfirm(keys []string) []error {
errs := make([]error, len(keys))
for i, key := range keys {
errs[i] = u.Confirm(key)
}
return errs
}
func (u *UnitedQueue) Stat(key string) (*QueueStat, error) {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
var topicName, lineName string
parts := strings.Split(key, "/")
if len(parts) < 1 || len(parts) > 2 {
return nil, NewError(
ErrBadKey,
`empty key parts error: `+ItoaQuick(len(parts)),
)
}
topicName = parts[0]
if topicName == "" {
return nil, NewError(
ErrBadKey,
`stat topic is nil`,
)
}
u.topicsLock.RLock()
t, ok := u.topics[topicName]
u.topicsLock.RUnlock()
if !ok {
return nil, NewError(
ErrTopicNotExisted,
`queue stat`,
)
}
if len(parts) == 2 {
lineName = parts[1]
return t.statLine(lineName)
}
qs := t.stat()
return qs, nil
}
func (u *UnitedQueue) Empty(key string) error {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
var topicName, lineName string
parts := strings.Split(key, "/")
if len(parts) < 1 || len(parts) > 2 {
return NewError(
ErrBadKey,
`empty key parts error: `+ItoaQuick(len(parts)),
)
}
topicName = parts[0]
if topicName == "" {
return NewError(
ErrBadKey,
`empty topic is nil`,
)
}
u.topicsLock.RLock()
t, ok := u.topics[topicName]
u.topicsLock.RUnlock()
if !ok {
return NewError(
ErrTopicNotExisted,
`queue empty`,
)
}
if len(parts) == 2 {
lineName = parts[1]
return t.emptyLine(lineName)
// err = t.emptyLine(lineName)
// if err != nil {
// log.Printf("empty line[%s] error: %s", lineName, err)
// }
// return err
}
return t.empty()
}
func (u *UnitedQueue) removeTopic(name string, fromEtcd bool) error {
u.topicsLock.Lock()
defer u.topicsLock.Unlock()
t, ok := u.topics[name]
if !ok {
return NewError(
ErrTopicNotExisted,
`queue remove`,
)
}
delete(u.topics, name)
err := u.exportQueue()
if err != nil {
u.topics[name] = t
return err
}
if !fromEtcd {
u.unRegisterTopic(name)
}
return t.remove()
}
func (u *UnitedQueue) remove(key string, fromEtcd bool) error {
key = strings.TrimPrefix(key, "/")
key = strings.TrimSuffix(key, "/")
var topicName, lineName string
parts := strings.Split(key, "/")
if len(parts) < 1 || len(parts) > 2 {
return NewError(
ErrBadKey,
`remove key parts error: `+ItoaQuick(len(parts)),
)
}
topicName = parts[0]
if topicName == "" {
return NewError(
ErrBadKey,
`rmove topic is nil`,
)
}
if len(parts) == 1 {
return u.removeTopic(topicName, fromEtcd)
}
u.topicsLock.RLock()
t, ok := u.topics[topicName]
u.topicsLock.RUnlock()
if !ok {
return NewError(
ErrTopicNotExisted,
`queue remove`,
)
}
lineName = parts[1]
return t.removeLine(lineName, fromEtcd)
}
func (u *UnitedQueue) Remove(key string) error {
return u.remove(key, false)
}
func (u *UnitedQueue) Close() {
log.Printf("uq stoping...")
close(u.etcdStop)
u.wg.Wait()
for _, t := range u.topics {
t.close()
}
err := u.exportTopics()
if err != nil {
log.Printf("export queue error: %s", err)
}
u.storage.Close()
log.Printf("uq stoped.")
}