mirror of
https://github.com/Monibuca/engine.git
synced 2025-10-06 00:56:58 +08:00
377 lines
9.9 KiB
Go
377 lines
9.9 KiB
Go
package engine
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import (
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"strings"
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"time"
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"unsafe"
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. "github.com/logrusorgru/aurora"
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"go.uber.org/zap"
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. "m7s.live/engine/v4/common"
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"m7s.live/engine/v4/log"
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"m7s.live/engine/v4/track"
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"m7s.live/engine/v4/util"
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)
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type StreamState byte
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type StreamAction byte
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type StateEvent struct {
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Action StreamAction
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From StreamState
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Stream *Stream
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}
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func (se StateEvent) Next() (next StreamState, ok bool) {
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next, ok = StreamFSM[se.From][se.Action]
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return
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}
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type SEwaitPublish struct {
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StateEvent
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Publisher IPublisher
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}
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type SEpublish struct {
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StateEvent
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}
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type SEwaitClose struct {
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StateEvent
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}
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type SEclose struct {
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StateEvent
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}
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type SEKick struct {
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}
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// 四状态机
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const (
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STATE_WAITPUBLISH StreamState = iota // 等待发布者状态
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STATE_PUBLISHING // 正在发布流状态
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STATE_WAITCLOSE // 等待关闭状态(自动关闭延时开启)
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STATE_CLOSED // 流已关闭，不可使用
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)
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const (
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ACTION_PUBLISH StreamAction = iota
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ACTION_TIMEOUT // 发布流长时间没有数据/长时间没有发布者发布流/等待关闭时间到
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ACTION_PUBLISHLOST // 发布者意外断开
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ACTION_CLOSE // 主动关闭流
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ACTION_LASTLEAVE // 最后一个订阅者离开
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ACTION_FIRSTENTER // 第一个订阅者进入
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)
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var StateNames = [...]string{"⌛", "🟢", "🟡", "🔴"}
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var ActionNames = [...]string{"publish", "timeout", "publish lost", "close", "last leave", "first enter", "no tracks"}
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/*
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stateDiagram-v2
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[*] --> ⌛等待发布者 : 创建
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⌛等待发布者 --> 🟢正在发布 :发布
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⌛等待发布者 --> 🔴已关闭 :关闭
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⌛等待发布者 --> 🔴已关闭 :超时
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⌛等待发布者 --> 🔴已关闭 :最后订阅者离开
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🟢正在发布 --> ⌛等待发布者: 发布者断开
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🟢正在发布 --> 🟡等待关闭: 最后订阅者离开
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🟢正在发布 --> 🔴已关闭 :关闭
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🟡等待关闭 --> 🟢正在发布 :第一个订阅者进入
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🟡等待关闭 --> 🔴已关闭 :关闭
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🟡等待关闭 --> 🔴已关闭 :超时
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🟡等待关闭 --> 🔴已关闭 :发布者断开
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*/
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var StreamFSM = [len(StateNames)]map[StreamAction]StreamState{
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{
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ACTION_PUBLISH: STATE_PUBLISHING,
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ACTION_TIMEOUT: STATE_CLOSED,
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ACTION_LASTLEAVE: STATE_CLOSED,
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ACTION_CLOSE: STATE_CLOSED,
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},
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{
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ACTION_PUBLISHLOST: STATE_WAITPUBLISH,
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ACTION_LASTLEAVE: STATE_WAITCLOSE,
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ACTION_CLOSE: STATE_CLOSED,
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},
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{
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ACTION_PUBLISHLOST: STATE_CLOSED,
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ACTION_TIMEOUT: STATE_CLOSED,
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ACTION_FIRSTENTER: STATE_PUBLISHING,
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ACTION_CLOSE: STATE_CLOSED,
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},
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{},
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}
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// Streams 所有的流集合
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var Streams = util.Map[string, *Stream]{Map: make(map[string]*Stream)}
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func FilterStreams[T IPublisher]() (ss []*Stream) {
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Streams.RLock()
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defer Streams.RUnlock()
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for _, s := range Streams.Map {
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if _, ok := s.Publisher.(T); ok {
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ss = append(ss, s)
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}
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}
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return
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}
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type StreamTimeoutConfig struct {
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WaitTimeout time.Duration
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PublishTimeout time.Duration
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WaitCloseTimeout time.Duration
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}
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// Stream 流定义
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type Stream struct {
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timeout *time.Timer //当前状态的超时定时器
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actionChan util.SafeChan[any]
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*zap.Logger
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StartTime time.Time //创建时间
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StreamTimeoutConfig
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Path string
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Publisher IPublisher
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State StreamState
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Subscribers []ISubscriber // 订阅者
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Tracks map[string]Track
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AppName string
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StreamName string
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}
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func (s *Stream) SSRC() uint32 {
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return uint32(uintptr(unsafe.Pointer(s)))
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}
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func findOrCreateStream(streamPath string, waitTimeout time.Duration) (s *Stream, created bool) {
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p := strings.Split(streamPath, "/")
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if len(p) < 2 {
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log.Warn(Red("Stream Path Format Error:"), streamPath)
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return nil, false
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}
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if s, ok := Streams.Map[streamPath]; ok {
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s.Debug("Stream Found")
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return s, false
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} else {
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p := strings.Split(streamPath, "/")
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s = &Stream{
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Path: streamPath,
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AppName: p[0],
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StreamName: util.LastElement(p),
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}
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s.Logger = log.With(zap.String("stream", streamPath))
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s.Info("created")
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s.WaitTimeout = waitTimeout
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Streams.Map[streamPath] = s
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s.actionChan.Init(1)
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s.timeout = time.NewTimer(waitTimeout)
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s.Tracks = make(map[string]Track)
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go s.run()
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return s, true
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}
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}
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func (r *Stream) broadcast(event any) {
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for _, sub := range r.Subscribers {
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sub.OnEvent(event)
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}
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}
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func (r *Stream) action(action StreamAction) (ok bool) {
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event := StateEvent{action, r.State, r}
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var next StreamState
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if next, ok = event.Next(); ok {
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r.State = next
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// 给Publisher状态变更的回调，方便进行远程拉流等操作
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var stateEvent any
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r.Debug(Sprintf("%s%s%s", StateNames[event.From], Yellow("->"), StateNames[next]), zap.String("action", ActionNames[action]))
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switch next {
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case STATE_WAITPUBLISH:
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stateEvent = SEwaitPublish{event, r.Publisher}
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r.timeout.Reset(r.WaitTimeout)
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case STATE_PUBLISHING:
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stateEvent = SEpublish{event}
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r.broadcast(stateEvent)
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r.timeout.Reset(time.Second * 5) // 5秒心跳，检测track的存活度
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case STATE_WAITCLOSE:
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stateEvent = SEwaitClose{event}
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r.timeout.Reset(r.WaitCloseTimeout)
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case STATE_CLOSED:
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for !r.actionChan.Close() {
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// 等待channel发送完毕
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time.Sleep(time.Millisecond * 100)
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}
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stateEvent = SEclose{event}
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r.broadcast(stateEvent)
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r.Subscribers = nil
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Streams.Delete(r.Path)
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r.timeout.Stop()
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}
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EventBus <- stateEvent
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if r.Publisher != nil {
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r.Publisher.OnEvent(stateEvent)
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}
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} else {
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r.Debug("wrong action", zap.String("action", ActionNames[action]))
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}
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return
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}
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func (r *Stream) IsClosed() bool {
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if r == nil {
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return true
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}
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return r.State == STATE_CLOSED
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}
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func (s *Stream) Close() {
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s.Receive(ACTION_CLOSE)
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}
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func (s *Stream) Receive(event any) bool {
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return s.actionChan.Send(event)
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}
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// 流状态处理中枢，包括接收订阅发布指令等
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func (s *Stream) run() {
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var waitP []*util.Promise[ISubscriber, struct{}]
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for {
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select {
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case <-s.timeout.C:
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if s.State == STATE_PUBLISHING {
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for name, t := range s.Tracks {
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// track 超过一定时间没有更新数据了
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if lastWriteTime := t.LastWriteTime(); !lastWriteTime.IsZero() && time.Since(lastWriteTime) > s.PublishTimeout {
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s.Warn("track timeout", zap.String("name", name), zap.Time("lastWriteTime", lastWriteTime), zap.Duration("timeout", s.PublishTimeout))
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delete(s.Tracks, name)
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s.broadcast(TrackRemoved{t})
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}
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}
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deletes := 0
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for i, sub := range s.Subscribers {
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if sub.IsClosed() {
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s.Subscribers = append(s.Subscribers[:(i-deletes)], s.Subscribers[i-deletes+1:]...)
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s.Info("suber -1", zap.String("id", sub.getID()), zap.String("type", sub.getType()), zap.Int("remains", len(s.Subscribers)))
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if s.Publisher != nil {
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s.Publisher.OnEvent(sub) // 通知Publisher有订阅者离开，在回调中可以去获取订阅者数量
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}
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if len(s.Subscribers) == 0 && s.WaitCloseTimeout > 0 {
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s.action(ACTION_LASTLEAVE)
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}
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}
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}
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if len(s.Tracks) == 0 {
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s.action(ACTION_PUBLISHLOST)
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} else {
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s.timeout.Reset(time.Second * 5)
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}
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} else {
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s.Debug("timeout", zap.String("state", StateNames[s.State]))
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s.action(ACTION_TIMEOUT)
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}
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case action, ok := <-s.actionChan.C:
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if ok {
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switch v := action.(type) {
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case *util.Promise[IPublisher, struct{}]:
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s.Publisher = v.Value
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if s.action(ACTION_PUBLISH) {
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s.Publisher.OnEvent(s) // 通知Publisher已成功进入Stream
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v.Resolve(util.Null)
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for _, p := range waitP {
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p.Resolve(util.Null)
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}
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waitP = waitP[:0]
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} else {
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s.Publisher = nil
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v.Reject(BadNameErr)
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}
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case *util.Promise[ISubscriber, struct{}]:
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if s.IsClosed() {
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v.Reject(StreamIsClosedErr)
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}
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suber := v.Value
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s.Subscribers = append(s.Subscribers, suber)
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sbConfig := suber.GetConfig()
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if wt := sbConfig.WaitTimeout.Duration(); wt > s.WaitTimeout {
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s.WaitTimeout = wt
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}
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suber.OnEvent(s) // 通知Subscriber已成功进入Stream
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s.Info("suber +1", zap.String("id", suber.getID()), zap.String("type", suber.getType()), zap.Int("remains", len(s.Subscribers)))
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if s.Publisher != nil {
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s.Publisher.OnEvent(v) // 通知Publisher有新的订阅者加入，在回调中可以去获取订阅者数量
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for _, t := range s.Tracks {
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switch t.(type) {
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case *track.Audio:
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if !sbConfig.SubAudio {
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continue
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}
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case *track.Video:
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if !sbConfig.SubVideo {
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continue
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}
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}
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suber.OnEvent(t) // 把现有的Track发给订阅者
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}
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v.Resolve(util.Null)
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} else {
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waitP = append(waitP, v)
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}
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if len(s.Subscribers) == 1 {
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s.action(ACTION_FIRSTENTER)
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}
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case Track:
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name := v.GetName()
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if _, ok := s.Tracks[name]; !ok {
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s.Tracks[name] = v
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s.Info("track +1", zap.String("name", name))
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s.broadcast(v)
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}
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case TrackRemoved:
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name := v.GetName()
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if _, ok := s.Tracks[name]; ok {
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s.Info("track -1", zap.String("name", name))
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delete(s.Tracks, name)
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s.broadcast(v)
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if len(s.Tracks) == 0 {
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s.action(ACTION_PUBLISHLOST)
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}
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}
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case StreamAction:
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s.action(v)
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default:
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s.Error("unknown action", zap.Any("action", action))
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}
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} else {
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for _, p := range waitP {
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p.Reject(StreamIsClosedErr)
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}
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return
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}
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}
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}
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}
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func (s *Stream) AddTrack(t Track) {
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s.Receive(t)
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}
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type TrackRemoved struct {
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Track
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}
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func (s *Stream) RemoveTrack(t Track) {
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s.Receive(TrackRemoved{t})
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}
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// 如果暂时不知道编码格式可以用这个
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func (r *Stream) NewVideoTrack() (vt *track.UnknowVideo) {
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vt = &track.UnknowVideo{}
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vt.Stream = r
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return
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}
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func (r *Stream) NewAudioTrack() (at *track.UnknowAudio) {
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at = &track.UnknowAudio{}
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at.Stream = r
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return
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}
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// func (r *Stream) WaitDataTrack(names ...string) DataTrack {
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// t := <-r.WaitTrack(names...)
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// return t.(DataTrack)
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// }
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