139 lines
3.1 KiB
Go
139 lines
3.1 KiB
Go
package comm
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import (
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"encoding/json"
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"sync"
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"time"
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"videoweb/pub/common/godef"
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"videoweb/pub/common/lock"
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"videoweb/pub/common/log"
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"github.com/go-redis/redis"
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"go.uber.org/zap"
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)
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type MessageType int64
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const (
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MessageTypeError MessageType = iota // 心跳消息
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MessageTypeAlive
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MessageTypeMediaAdd // 添加一个媒体
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MessageTypeMediaDel // 删除一个媒体
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MessageTypePostAdd // 添加一个帖子
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MessageTypePostDel // 删除一个帖子
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)
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type message struct {
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Type MessageType
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Payload []byte
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}
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type OnReceive func(data []byte)
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type Communicate struct {
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sendChannel string // 发送消息的频道
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recvChannel string // 接收消息的频道
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client *redis.Client // Redis的客户端
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lock sync.RWMutex
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callbacks map[MessageType][]OnReceive
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publish *lock.Queue[*message]
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}
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func NewCommunicate(client *redis.Client, sendChannel string, recvChannel string) *Communicate {
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return &Communicate{
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sendChannel: sendChannel,
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recvChannel: recvChannel,
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client: client,
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callbacks: make(map[MessageType][]OnReceive),
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publish: lock.NewQueue[*message](),
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}
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}
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func (c *Communicate) RegisterReceiver(mType MessageType, receive OnReceive) {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.callbacks[mType] = append(c.callbacks[mType], receive)
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}
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func (c *Communicate) findEvent(mType MessageType) []OnReceive {
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c.lock.RLock()
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defer c.lock.RUnlock()
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return c.callbacks[mType]
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}
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func (c *Communicate) dispatchMessage(mType MessageType, payload []byte) {
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events := c.findEvent(mType)
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for _, event := range events {
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event(payload)
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}
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}
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func (c *Communicate) handleRecv(data *redis.Message) {
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if data.Channel == "error" {
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log.Error("recv from channel %s failed", zap.Any("error", data.Payload))
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return
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}
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if data.Channel == c.recvChannel {
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msg := &message{}
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err := json.Unmarshal([]byte(data.Payload), msg)
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if err != nil {
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log.Error("recv from channel %s failed", zap.Any("error", err))
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}
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c.dispatchMessage(msg.Type, msg.Payload)
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}
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}
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func (c *Communicate) Send(mType MessageType, payload []byte) error {
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msg := &message{
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Type: mType,
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Payload: payload,
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}
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c.publish.Enqueue(msg)
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return nil
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}
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func (c *Communicate) Start() {
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// 启动接收线程
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godef.Go(func() {
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sub := c.client.Subscribe(c.recvChannel)
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defer sub.Close()
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// 循环接收消息
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for {
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msg, err := sub.ReceiveMessage()
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if err != nil {
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msg = &redis.Message{
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Channel: "error",
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Payload: err.Error(),
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}
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c.handleRecv(msg)
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time.Sleep(time.Second)
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} else {
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c.handleRecv(msg)
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}
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}
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})
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// 启动发送线程
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godef.Go(func() {
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for {
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time.Sleep(time.Second)
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for !c.publish.IsEmpty() {
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msg, ok := c.publish.Dequeue()
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if !ok {
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break
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}
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data, err := json.Marshal(msg)
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if err != nil {
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log.Error("Communicate msg marshal failed", zap.Any("error", err))
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break
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}
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err = c.client.Publish(c.sendChannel, data).Err()
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if err != nil {
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c.publish.Enqueue(msg) // 再写回队列
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log.Error("Communicate send msg failed", zap.Any("error", err))
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break
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}
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}
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}
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})
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}
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