mirror of
https://github.com/Monibuca/engine.git
synced 2025-10-05 16:46:58 +08:00
487 lines
12 KiB
Go
487 lines
12 KiB
Go
package engine
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import (
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"encoding/json"
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"sort"
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"strings"
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"sync"
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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 `json:"-"`
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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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type UnsubscribeEvent struct {
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Subscriber ISubscriber
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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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type StreamList []*Stream
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func (l StreamList) Len() int {
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return len(l)
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}
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func (l StreamList) Less(i, j int) bool {
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return l[i].Path < l[j].Path
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}
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func (l StreamList) Swap(i, j int) {
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l[i], l[j] = l[j], l[i]
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}
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func (l StreamList) Sort() {
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sort.Sort(l)
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}
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func GetSortedStreamList() StreamList {
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result := StreamList(Streams.ToList())
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result.Sort()
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return result
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}
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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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PublishTimeout time.Duration //发布者无数据后超时
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DelayCloseTimeout time.Duration //发布者丢失后等待
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}
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type Tracks struct {
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util.Map[string, Track]
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}
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func (tracks *Tracks) MarshalJSON() ([]byte, error) {
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return json.Marshal(util.MapList(&tracks.Map, func(_ string, t Track) Track {
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t.SnapForJson()
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return t
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}))
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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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StateEvent StateEvent // 进入当前状态的事件
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Subscribers Subscribers // 订阅者
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Tracks Tracks
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AppName string
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StreamName string
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}
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type StreamSummay struct {
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Path string
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State StreamState
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Subscribers int
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Tracks []string
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StartTime time.Time
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Type string
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BPS int
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}
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// Summary 返回流的简要信息
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func (s *Stream) Summary() (r StreamSummay) {
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if s.Publisher != nil {
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r.Type = s.Publisher.GetPublisher().Type
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}
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r.Tracks = util.MapList(&s.Tracks.Map, func(name string, t Track) string {
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b := t.GetBase()
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r.BPS += b.BPS
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return name
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})
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r.Path = s.Path
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r.State = s.State
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r.Subscribers = s.Subscribers.Len()
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r.StartTime = s.StartTime
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return
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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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StartTime: time.Now(),
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timeout: time.NewTimer(waitTimeout),
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}
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s.Subscribers.Init()
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s.Logger = log.With(zap.String("stream", streamPath))
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s.Info("created")
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Streams.Map[streamPath] = s
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s.actionChan.Init(1)
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s.Tracks.Init()
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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) 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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r.StateEvent = event
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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.Info(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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waitTime := 0
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if r.Publisher != nil {
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waitTime = r.Publisher.GetPublisher().Config.WaitCloseTimeout
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}
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r.Subscribers.OnPublisherLost(event)
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suber := r.Subscribers.Pick()
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if suber != nil {
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r.Subscribers.Broadcast(stateEvent)
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if waitTime == 0 {
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waitTime = suber.GetSubscriber().Config.WaitTimeout
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}
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} else if waitTime == 0 {
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waitTime = 1 //没有订阅者也没有配置发布者等待重连时间，默认1秒后关闭流
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}
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r.timeout.Reset(util.Second2Duration(waitTime))
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case STATE_PUBLISHING:
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stateEvent = SEpublish{event}
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r.Subscribers.Broadcast(stateEvent)
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r.timeout.Reset(r.PublishTimeout) // 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.DelayCloseTimeout)
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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.Subscribers.Broadcast(stateEvent)
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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) IsShutdown() bool {
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return r.StateEvent.Action == ACTION_CLOSE || (r.StateEvent.Action == ACTION_TIMEOUT && r.StateEvent.From == STATE_WAITCLOSE)
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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 (r *Stream) Close() {
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r.Receive(ACTION_CLOSE)
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}
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func (s *Stream) Receive(event any) bool {
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if s.IsClosed() {
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return false
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}
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return s.actionChan.Send(event)
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}
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func (s *Stream) onSuberClose(sub ISubscriber) {
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s.Subscribers.Delete(sub)
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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 s.DelayCloseTimeout > 0 && s.Subscribers.Len() == 0 {
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s.action(ACTION_LASTLEAVE)
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}
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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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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 sub := range s.Subscribers.internal {
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if sub.IsClosed() {
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delete(s.Subscribers.internal, sub)
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s.Info("innersuber -1", zap.Int("remains", len(s.Subscribers.internal)))
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}
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}
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for sub := range s.Subscribers.public {
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if sub.IsClosed() {
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s.onSuberClose(sub)
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}
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}
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s.Tracks.ModifyRange(func(name string, t Track) {
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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.Map.Map, name)
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s.Subscribers.Broadcast(TrackRemoved{t})
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}
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})
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if s.State != STATE_PUBLISHING {
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continue
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}
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if s.Tracks.Len() == 0 || (s.Publisher != nil && s.Publisher.IsClosed()) {
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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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//订阅者等待音视频轨道超时了，放弃等待，订阅成功
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s.Subscribers.AbortWait()
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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]:
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if s.IsClosed() {
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v.Reject(ErrStreamIsClosed)
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}
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republish := s.Publisher == v.Value // 重复发布
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if !republish {
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s.Publisher = v.Value
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}
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if s.action(ACTION_PUBLISH) || republish {
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v.Resolve()
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} else {
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v.Reject(ErrBadName)
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}
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case *util.Promise[ISubscriber]:
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if s.IsClosed() {
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v.Reject(ErrStreamIsClosed)
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}
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suber := v.Value
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io := suber.GetSubscriber()
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sbConfig := io.Config
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waits := &waitTracks{
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Promise: v,
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}
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if ats := io.Args.Get("ats"); ats != "" {
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waits.audio.Wait(strings.Split(ats, ",")...)
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} else if len(sbConfig.SubAudioTracks) > 0 {
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waits.audio.Wait(sbConfig.SubAudioTracks...)
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} else if sbConfig.SubAudio {
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waits.audio.Wait()
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}
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if vts := io.Args.Get("vts"); vts != "" {
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waits.video.Wait(strings.Split(vts, ",")...)
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} else if len(sbConfig.SubVideoTracks) > 0 {
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waits.video.Wait(sbConfig.SubVideoTracks...)
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} else if sbConfig.SubVideo {
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waits.video.Wait()
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}
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if dts := io.Args.Get("dts"); dts != "" {
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waits.data.Wait(strings.Split(dts, ",")...)
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} else {
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// waits.data.Wait()
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}
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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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pubConfig := s.Publisher.GetPublisher().Config
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s.Tracks.Range(func(name string, t Track) {
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waits.Accept(t)
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})
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if !pubConfig.PubAudio || s.Subscribers.waitAborted {
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waits.audio.StopWait()
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}
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if !pubConfig.PubVideo || s.Subscribers.waitAborted {
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waits.video.StopWait()
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}
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}
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s.Subscribers.Add(suber, waits)
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if s.Subscribers.Len() == 1 && s.State == STATE_WAITCLOSE {
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s.action(ACTION_FIRSTENTER)
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}
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case ISubscriber:
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s.onSuberClose(v)
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case TrackRemoved:
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name := v.GetBase().Name
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if t, ok := s.Tracks.Delete(name); ok {
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s.Info("track -1", zap.String("name", name))
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s.Subscribers.Broadcast(t)
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if s.Tracks.Len() == 0 {
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s.action(ACTION_PUBLISHLOST)
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}
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if dt, ok := t.(*track.Data); ok {
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dt.Dispose()
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}
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}
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case Track:
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if s.State == STATE_WAITPUBLISH {
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s.action(ACTION_PUBLISH)
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}
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name := v.GetBase().Name
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if s.Tracks.Add(name, v) {
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s.Info("track +1", zap.String("name", name))
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s.Subscribers.OnTrack(v)
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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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s.Subscribers.Dispose()
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s.Tracks.Range(func(_ string, t Track) {
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if dt, ok := t.(*track.Data); ok {
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dt.Dispose()
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}
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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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func (r *Stream) NewDataTrack(locker sync.Locker) (dt *track.Data) {
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dt = &track.Data{
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Locker: locker,
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}
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dt.Init(10)
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dt.Stream = r
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return
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}
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