hls: fix freeze when sourceOnDemand is yes and multiple sources are requested at the same time (#493)

internal/core/hls_remuxer.go

@@ -111,6 +111,7 @@ type hlsRemuxer struct {
 	ringBuffer      *ringbuffer.RingBuffer
 	lastRequestTime *int64
 	muxer           *hls.Muxer
+	requests        []hlsRemuxerRequest
 
 	// in
 	request chan hlsRemuxerRequest
@@ -177,22 +178,44 @@ func (r *hlsRemuxer) PathName() string {
 func (r *hlsRemuxer) run() {
 	defer r.wg.Done()
 
-	innerCtx, innerCtxCancel := context.WithCancel(context.Background())
+	remuxerCtx, remuxerCtxCancel := context.WithCancel(context.Background())
-	runErr := make(chan error)
+	remuxerReady := make(chan struct{})
+	remuxerErr := make(chan error)
 	go func() {
-		runErr <- r.runInner(innerCtx)
+		remuxerErr <- r.runRemuxer(remuxerCtx, remuxerReady)
 	}()
 
+	isReady := false
+
+outer:
+	for {
 		select {
-	case err := <-runErr:
+		case <-r.ctx.Done():
-		innerCtxCancel()
+			remuxerCtxCancel()
+			<-remuxerErr
+			break outer
+
+		case req := <-r.request:
+			if isReady {
+				r.handleRequest(req)
+			} else {
+				r.requests = append(r.requests, req)
+			}
+
+		case <-remuxerReady:
+			isReady = true
+			for _, req := range r.requests {
+				r.handleRequest(req)
+			}
+			r.requests = nil
+
+		case err := <-remuxerErr:
+			remuxerCtxCancel()
 			if err != nil {
 				r.log(logger.Info, "ERR: %s", err)
 			}
-
+			break outer
-	case <-r.ctx.Done():
+		}
-		innerCtxCancel()
-		<-runErr
 	}
 
 	r.ctxCancel()
@@ -200,14 +223,13 @@ func (r *hlsRemuxer) run() {
 	r.parent.OnRemuxerClose(r)
 }
 
-func (r *hlsRemuxer) runInner(innerCtx context.Context) error {
+func (r *hlsRemuxer) runRemuxer(remuxerCtx context.Context, remuxerReady chan struct{}) error {
 	res := r.pathManager.OnReaderSetupPlay(pathReaderSetupPlayReq{
 		Author:              r,
 		PathName:            r.pathName,
 		IP:                  nil,
 		ValidateCredentials: nil,
 	})
-
 	if res.Err != nil {
 		return res.Err
 	}
@@ -283,21 +305,11 @@ func (r *hlsRemuxer) runInner(innerCtx context.Context) error {
 	}
 	defer r.muxer.Close()
 
-	// start request handler only after muxer has been inizialized
+	remuxerReady <- struct{}{}
-	requestHandlerTerminate := make(chan struct{})
-	requestHandlerDone := make(chan struct{})
-	go r.runRequestHandler(requestHandlerTerminate, requestHandlerDone)
-
-	defer func() {
-		close(requestHandlerTerminate)
-		<-requestHandlerDone
-	}()
 
 	r.ringBuffer = ringbuffer.New(uint64(r.readBufferCount))
 
-	r.path.OnReaderPlay(pathReaderPlayReq{
+	r.path.OnReaderPlay(pathReaderPlayReq{Author: r})
-		Author: r,
-	})
 
 	writerDone := make(chan error)
 	go func() {
@@ -396,7 +408,7 @@ func (r *hlsRemuxer) runInner(innerCtx context.Context) error {
 		case err := <-writerDone:
 			return err
 
-		case <-innerCtx.Done():
+		case <-remuxerCtx.Done():
 			r.ringBuffer.Close()
 			<-writerDone
 			return nil
@@ -404,17 +416,7 @@ func (r *hlsRemuxer) runInner(innerCtx context.Context) error {
 	}
 }
 
-func (r *hlsRemuxer) runRequestHandler(terminate chan struct{}, done chan struct{}) {
+func (r *hlsRemuxer) handleRequest(req hlsRemuxerRequest) {
-	defer close(done)
-
-	for {
-		select {
-		case <-terminate:
-			return
-
-		case preq := <-r.request:
-			req := preq
-
 	atomic.StoreInt64(r.lastRequestTime, time.Now().Unix())
 
 	conf := r.path.Conf()
@@ -426,7 +428,7 @@ func (r *hlsRemuxer) runRequestHandler(terminate chan struct{}, done chan struct
 			r.log(logger.Info, "ERR: ip '%s' not allowed", ip)
 			req.W.WriteHeader(http.StatusUnauthorized)
 			req.Res <- nil
-					continue
+			return
 		}
 	}
 
@@ -436,7 +438,7 @@ func (r *hlsRemuxer) runRequestHandler(terminate chan struct{}, done chan struct
 			req.W.Header().Set("WWW-Authenticate", `Basic realm="rtsp-simple-server"`)
 			req.W.WriteHeader(http.StatusUnauthorized)
 			req.Res <- nil
-					continue
+			return
 		}
 	}
 
@@ -446,7 +448,7 @@ func (r *hlsRemuxer) runRequestHandler(terminate chan struct{}, done chan struct
 		if r == nil {
 			req.W.WriteHeader(http.StatusNotFound)
 			req.Res <- nil
-					continue
+			return
 		}
 
 		req.W.Header().Set("Content-Type", `application/x-mpegURL`)
@@ -457,7 +459,7 @@ func (r *hlsRemuxer) runRequestHandler(terminate chan struct{}, done chan struct
 		if r == nil {
 			req.W.WriteHeader(http.StatusNotFound)
 			req.Res <- nil
-					continue
+			return
 		}
 
 		req.W.Header().Set("Content-Type", `video/MP2T`)
@@ -471,8 +473,6 @@ func (r *hlsRemuxer) runRequestHandler(terminate chan struct{}, done chan struct
 		req.Res <- nil
 	}
 }
-	}
-}
 
 // OnRequest is called by hlsserver.Server (forwarded from ServeHTTP).
 func (r *hlsRemuxer) OnRequest(req hlsRemuxerRequest) {