close connections in case of write errors (#613) (#655)

async_processor.go

@@ -4,46 +4,57 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/ringbuffer"
 )
 
-// this struct contains a queue that allows to detach the routine that is reading a stream
+// this is an asynchronous queue processor
+// that allows to detach the routine that is reading a stream
 // from the routine that is writing a stream.
 type asyncProcessor struct {
+	bufferSize int
+
 	running bool
 	buffer  *ringbuffer.RingBuffer
 
-	done chan struct{}
+	chError chan error
 }
 
-func (w *asyncProcessor) allocateBuffer(size int) {
+func (w *asyncProcessor) initialize() {
-	w.buffer, _ = ringbuffer.New(uint64(size))
+	w.buffer, _ = ringbuffer.New(uint64(w.bufferSize))
 }
 
 func (w *asyncProcessor) start() {
 	w.running = true
-	w.done = make(chan struct{})
+	w.chError = make(chan error)
 	go w.run()
 }
 
 func (w *asyncProcessor) stop() {
-	if w.running {
+	if !w.running {
-		w.buffer.Close()
+		panic("should not happen")
-		<-w.done
-		w.running = false
 	}
+	w.buffer.Close()
+	<-w.chError
+	w.running = false
 }
 
 func (w *asyncProcessor) run() {
-	defer close(w.done)
+	err := w.runInner()
+	w.chError <- err
+	close(w.chError)
+}
 
+func (w *asyncProcessor) runInner() error {
 	for {
 		tmp, ok := w.buffer.Pull()
 		if !ok {
-			return
+			return nil
 		}
 
-		tmp.(func())()
+		err := tmp.(func() error)()
+		if err != nil {
+			return err
+		}
 	}
 }
 
-func (w *asyncProcessor) push(cb func()) bool {
+func (w *asyncProcessor) push(cb func() error) bool {
 	return w.buffer.Push(cb)
 }

client.go

@@ -335,7 +335,7 @@ type Client struct {
 	keepalivePeriod      time.Duration
 	keepaliveTimer       *time.Timer
 	closeError           error
-	writer               asyncProcessor
+	writer               *asyncProcessor
 	reader               *clientReader
 	timeDecoder          *rtptime.GlobalDecoder2
 	mustClose            bool
@@ -348,9 +348,6 @@ type Client struct {
 	chPlay     chan playReq
 	chRecord   chan recordReq
 	chPause    chan pauseReq
-	chReadError    chan error
-	chReadResponse chan *base.Response
-	chReadRequest  chan *base.Request
 
 	// out
 	done chan struct{}
@@ -462,9 +459,6 @@ func (c *Client) Start(scheme string, host string) error {
 	c.chPlay = make(chan playReq)
 	c.chRecord = make(chan recordReq)
 	c.chPause = make(chan pauseReq)
-	c.chReadError = make(chan error)
-	c.chReadResponse = make(chan *base.Response)
-	c.chReadRequest = make(chan *base.Request)
 	c.done = make(chan struct{})
 
 	go c.run()
@@ -530,6 +524,34 @@ func (c *Client) run() {
 
 func (c *Client) runInner() error {
 	for {
+		chReaderResponse := func() chan *base.Response {
+			if c.reader != nil {
+				return c.reader.chResponse
+			}
+			return nil
+		}()
+
+		chReaderRequest := func() chan *base.Request {
+			if c.reader != nil {
+				return c.reader.chRequest
+			}
+			return nil
+		}()
+
+		chReaderError := func() chan error {
+			if c.reader != nil {
+				return c.reader.chError
+			}
+			return nil
+		}()
+
+		chWriterError := func() chan error {
+			if c.writer != nil {
+				return c.writer.chError
+			}
+			return nil
+		}()
+
 		select {
 		case req := <-c.chOptions:
 			res, err := c.doOptions(req.url)
@@ -601,15 +623,18 @@ func (c *Client) runInner() error {
 			}
 			c.keepaliveTimer = time.NewTimer(c.keepalivePeriod)
 
-		case err := <-c.chReadError:
+		case err := <-chWriterError:
+			return err
+
+		case err := <-chReaderError:
 			c.reader = nil
 			return err
 
-		case res := <-c.chReadResponse:
+		case res := <-chReaderResponse:
 			c.OnResponse(res)
 			// these are responses to keepalives, ignore them.
 
-		case req := <-c.chReadRequest:
+		case req := <-chReaderRequest:
 			err := c.handleServerRequest(req)
 			if err != nil {
 				return err
@@ -630,11 +655,11 @@ func (c *Client) waitResponse(requestCseqStr string) (*base.Response, error) {
 		case <-t.C:
 			return nil, liberrors.ErrClientRequestTimedOut{}
 
-		case err := <-c.chReadError:
+		case err := <-c.reader.chError:
 			c.reader = nil
 			return nil, err
 
-		case res := <-c.chReadResponse:
+		case res := <-c.reader.chResponse:
 			c.OnResponse(res)
 
 			// accept response if CSeq equals request CSeq, or if CSeq is not present
@@ -642,7 +667,7 @@ func (c *Client) waitResponse(requestCseqStr string) (*base.Response, error) {
 				return res, nil
 			}
 
-		case req := <-c.chReadRequest:
+		case req := <-c.reader.chRequest:
 			err := c.handleServerRequest(req)
 			if err != nil {
 				return nil, err
@@ -682,8 +707,8 @@ func (c *Client) handleServerRequest(req *base.Request) error {
 
 func (c *Client) doClose() {
 	if c.state == clientStatePlay || c.state == clientStateRecord {
-		c.stopWriter()
+		c.writer.stop()
-		c.stopReadRoutines()
+		c.stopTransportRoutines()
 	}
 
 	if c.nconn != nil && c.baseURL != nil {
@@ -808,15 +833,21 @@ func (c *Client) trySwitchingProtocol2(medi *description.Media, baseURL *base.UR
 	return c.doSetup(baseURL, medi, 0, 0)
 }
 
-func (c *Client) startReadRoutines() {
+func (c *Client) startTransportRoutines() {
 	// allocate writer here because it's needed by RTCP receiver / sender
 	if c.state == clientStateRecord || c.backChannelSetupped {
-		c.writer.allocateBuffer(c.WriteQueueSize)
+		c.writer = &asyncProcessor{
+			bufferSize: c.WriteQueueSize,
+		}
+		c.writer.initialize()
 	} else {
 		// when reading, buffer is only used to send RTCP receiver reports,
 		// that are much smaller than RTP packets and are sent at a fixed interval.
 		// decrease RAM consumption by allocating less buffers.
-		c.writer.allocateBuffer(8)
+		c.writer = &asyncProcessor{
+			bufferSize: 8,
+		}
+		c.writer.initialize()
 	}
 
 	c.timeDecoder = rtptime.NewGlobalDecoder2()
@@ -848,7 +879,7 @@ func (c *Client) startReadRoutines() {
 	}
 }
 
-func (c *Client) stopReadRoutines() {
+func (c *Client) stopTransportRoutines() {
 	if c.reader != nil {
 		c.reader.setAllowInterleavedFrames(false)
 	}
@@ -861,14 +892,8 @@ func (c *Client) stopReadRoutines() {
 	}
 
 	c.timeDecoder = nil
-}
 
-func (c *Client) startWriter() {
+	c.writer = nil
-	c.writer.start()
-}
-
-func (c *Client) stopWriter() {
-	c.writer.stop()
 }
 
 func (c *Client) connOpen() error {
@@ -1637,7 +1662,7 @@ func (c *Client) doPlay(ra *headers.Range) (*base.Response, error) {
 	}
 
 	c.state = clientStatePlay
-	c.startReadRoutines()
+	c.startTransportRoutines()
 
 	// Range is mandatory in Parrot Streaming Server
 	if ra == nil {
@@ -1662,13 +1687,13 @@ func (c *Client) doPlay(ra *headers.Range) (*base.Response, error) {
 		Header: header,
 	}, false)
 	if err != nil {
-		c.stopReadRoutines()
+		c.stopTransportRoutines()
 		c.state = clientStatePrePlay
 		return nil, err
 	}
 
 	if res.StatusCode != base.StatusOK {
-		c.stopReadRoutines()
+		c.stopTransportRoutines()
 		c.state = clientStatePrePlay
 		return nil, liberrors.ErrClientBadStatusCode{
 			Code: res.StatusCode, Message: res.StatusMessage,
@@ -1689,7 +1714,7 @@ func (c *Client) doPlay(ra *headers.Range) (*base.Response, error) {
 		}
 	}
 
-	c.startWriter()
+	c.writer.start()
 	c.lastRange = ra
 
 	return res, nil
@@ -1718,27 +1743,27 @@ func (c *Client) doRecord() (*base.Response, error) {
 	}
 
 	c.state = clientStateRecord
-	c.startReadRoutines()
+	c.startTransportRoutines()
 
 	res, err := c.do(&base.Request{
 		Method: base.Record,
 		URL:    c.baseURL,
 	}, false)
 	if err != nil {
-		c.stopReadRoutines()
+		c.stopTransportRoutines()
 		c.state = clientStatePreRecord
 		return nil, err
 	}
 
 	if res.StatusCode != base.StatusOK {
-		c.stopReadRoutines()
+		c.stopTransportRoutines()
 		c.state = clientStatePreRecord
 		return nil, liberrors.ErrClientBadStatusCode{
 			Code: res.StatusCode, Message: res.StatusMessage,
 		}
 	}
 
-	c.startWriter()
+	c.writer.start()
 
 	return nil, nil
 }
@@ -1766,25 +1791,25 @@ func (c *Client) doPause() (*base.Response, error) {
 		return nil, err
 	}
 
-	c.stopWriter()
+	c.writer.stop()
 
 	res, err := c.do(&base.Request{
 		Method: base.Pause,
 		URL:    c.baseURL,
 	}, false)
 	if err != nil {
-		c.startWriter()
+		c.writer.start()
 		return nil, err
 	}
 
 	if res.StatusCode != base.StatusOK {
-		c.startWriter()
+		c.writer.start()
 		return nil, liberrors.ErrClientBadStatusCode{
 			Code: res.StatusCode, Message: res.StatusMessage,
 		}
 	}
 
-	c.stopReadRoutines()
+	c.stopTransportRoutines()
 
 	switch c.state {
 	case clientStatePlay:
@@ -1929,15 +1954,3 @@ func (c *Client) PacketNTP(medi *description.Media, pkt *rtp.Packet) (time.Time,
 	ct := cm.formats[pkt.PayloadType]
 	return ct.rtcpReceiver.PacketNTP(pkt.Timestamp)
 }
-
-func (c *Client) readResponse(res *base.Response) {
-	c.chReadResponse <- res
-}
-
-func (c *Client) readRequest(req *base.Request) {
-	c.chReadRequest <- req
-}
-
-func (c *Client) readError(err error) {
-	c.chReadError <- err
-}

client_format.go

@@ -74,8 +74,8 @@ func (cf *clientFormat) stop() {
 func (cf *clientFormat) writePacketRTP(byts []byte, pkt *rtp.Packet, ntp time.Time) error {
 	cf.rtcpSender.ProcessPacket(pkt, ntp, cf.format.PTSEqualsDTS(pkt))
 
-	ok := cf.cm.c.writer.push(func() {
+	ok := cf.cm.c.writer.push(func() error {
-		cf.cm.writePacketRTPInQueue(byts)
+		return cf.cm.writePacketRTPInQueue(byts)
 	})
 	if !ok {
 		return liberrors.ErrClientWriteQueueFull{}

client_media.go

@@ -25,8 +25,8 @@ type clientMedia struct {
 	tcpRTPFrame            *base.InterleavedFrame
 	tcpRTCPFrame           *base.InterleavedFrame
 	tcpBuffer              []byte
-	writePacketRTPInQueue  func([]byte)
+	writePacketRTPInQueue  func([]byte) error
-	writePacketRTCPInQueue func([]byte)
+	writePacketRTCPInQueue func([]byte) error
 }
 
 func (cm *clientMedia) close() {
@@ -152,29 +152,29 @@ func (cm *clientMedia) findFormatWithSSRC(ssrc uint32) *clientFormat {
 	return nil
 }
 
-func (cm *clientMedia) writePacketRTPInQueueUDP(payload []byte) {
+func (cm *clientMedia) writePacketRTPInQueueUDP(payload []byte) error {
-	cm.udpRTPListener.write(payload) //nolint:errcheck
+	return cm.udpRTPListener.write(payload)
 }
 
-func (cm *clientMedia) writePacketRTCPInQueueUDP(payload []byte) {
+func (cm *clientMedia) writePacketRTCPInQueueUDP(payload []byte) error {
-	cm.udpRTCPListener.write(payload) //nolint:errcheck
+	return cm.udpRTCPListener.write(payload)
 }
 
-func (cm *clientMedia) writePacketRTPInQueueTCP(payload []byte) {
+func (cm *clientMedia) writePacketRTPInQueueTCP(payload []byte) error {
 	cm.tcpRTPFrame.Payload = payload
 	cm.c.nconn.SetWriteDeadline(time.Now().Add(cm.c.WriteTimeout))
-	cm.c.conn.WriteInterleavedFrame(cm.tcpRTPFrame, cm.tcpBuffer) //nolint:errcheck
+	return cm.c.conn.WriteInterleavedFrame(cm.tcpRTPFrame, cm.tcpBuffer)
 }
 
-func (cm *clientMedia) writePacketRTCPInQueueTCP(payload []byte) {
+func (cm *clientMedia) writePacketRTCPInQueueTCP(payload []byte) error {
 	cm.tcpRTCPFrame.Payload = payload
 	cm.c.nconn.SetWriteDeadline(time.Now().Add(cm.c.WriteTimeout))
-	cm.c.conn.WriteInterleavedFrame(cm.tcpRTCPFrame, cm.tcpBuffer) //nolint:errcheck
+	return cm.c.conn.WriteInterleavedFrame(cm.tcpRTCPFrame, cm.tcpBuffer)
 }
 
 func (cm *clientMedia) writePacketRTCP(byts []byte) error {
-	ok := cm.c.writer.push(func() {
+	ok := cm.c.writer.push(func() error {
-		cm.writePacketRTCPInQueue(byts)
+		return cm.writePacketRTCPInQueue(byts)
 	})
 	if !ok {
 		return liberrors.ErrClientWriteQueueFull{}

client_reader.go

@@ -12,9 +12,17 @@ type clientReader struct {
 
 	mutex                  sync.Mutex
 	allowInterleavedFrames bool
+
+	chResponse chan *base.Response
+	chRequest  chan *base.Request
+	chError    chan error
 }
 
 func (r *clientReader) start() {
+	r.chResponse = make(chan *base.Response)
+	r.chRequest = make(chan *base.Request)
+	r.chError = make(chan error)
+
 	go r.run()
 }
 
@@ -27,18 +35,17 @@ func (r *clientReader) setAllowInterleavedFrames(v bool) {
 func (r *clientReader) wait() {
 	for {
 		select {
-		case <-r.c.chReadError:
+		case <-r.chError:
 			return
 
-		case <-r.c.chReadResponse:
+		case <-r.chResponse:
-		case <-r.c.chReadRequest:
+		case <-r.chRequest:
 		}
 	}
 }
 
 func (r *clientReader) run() {
-	err := r.runInner()
+	r.chError <- r.runInner()
-	r.c.readError(err)
 }
 
 func (r *clientReader) runInner() error {
@@ -50,10 +57,10 @@ func (r *clientReader) runInner() error {
 
 		switch what := what.(type) {
 		case *base.Response:
-			r.c.readResponse(what)
+			r.chResponse <- what
 
 		case *base.Request:
-			r.c.readRequest(what)
+			r.chRequest <- what
 
 		case *base.InterleavedFrame:
 			r.mutex.Lock()

client_record_test.go

@@ -126,7 +126,7 @@ func readRequestIgnoreFrames(c *conn.Conn) (*base.Request, error) {
 	}
 }
 
-func TestClientRecordSerial(t *testing.T) {
+func TestClientRecord(t *testing.T) {
 	for _, transport := range []string{
 		"udp",
 		"tcp",
@@ -350,7 +350,7 @@ func TestClientRecordSerial(t *testing.T) {
 	}
 }
 
-func TestClientRecordParallel(t *testing.T) {
+func TestClientRecordSocketError(t *testing.T) {
 	for _, transport := range []string{
 		"udp",
 		"tcp",
@@ -446,15 +446,6 @@ func TestClientRecordParallel(t *testing.T) {
 					StatusCode: base.StatusOK,
 				})
 				require.NoError(t, err2)
-
-				req, err2 = readRequestIgnoreFrames(conn)
-				require.NoError(t, err2)
-				require.Equal(t, base.Teardown, req.Method)
-
-				err2 = conn.WriteResponse(&base.Response{
-					StatusCode: base.StatusOK,
-				})
-				require.NoError(t, err2)
 			}()
 
 			c := Client{
@@ -471,9 +462,6 @@ func TestClientRecordParallel(t *testing.T) {
 				}(),
 			}
 
-			writerDone := make(chan struct{})
-			defer func() { <-writerDone }()
-
 			medi := testH264Media
 			medias := []*description.Media{medi}
 
@@ -481,21 +469,15 @@ func TestClientRecordParallel(t *testing.T) {
 			require.NoError(t, err)
 			defer c.Close()
 
-			go func() {
+			ti := time.NewTicker(50 * time.Millisecond)
-				defer close(writerDone)
+			defer ti.Stop()
 
-				t := time.NewTicker(50 * time.Millisecond)
+			for range ti.C {
-				defer t.Stop()
-
-				for range t.C {
 				err := c.WritePacketRTP(medi, &testRTPPacket)
 				if err != nil {
-						return
+					break
 				}
 			}
-			}()
-
-			time.Sleep(1 * time.Second)
 		})
 	}
 }
@@ -645,143 +627,6 @@ func TestClientRecordPauseSerial(t *testing.T) {
 	}
 }
 
-func TestClientRecordPauseParallel(t *testing.T) {
-	for _, transport := range []string{
-		"udp",
-		"tcp",
-	} {
-		t.Run(transport, func(t *testing.T) {
-			l, err := net.Listen("tcp", "localhost:8554")
-			require.NoError(t, err)
-			defer l.Close()
-
-			serverDone := make(chan struct{})
-			defer func() { <-serverDone }()
-			go func() {
-				defer close(serverDone)
-
-				nconn, err2 := l.Accept()
-				require.NoError(t, err2)
-				defer nconn.Close()
-				conn := conn.NewConn(nconn)
-
-				req, err2 := conn.ReadRequest()
-				require.NoError(t, err2)
-				require.Equal(t, base.Options, req.Method)
-
-				err2 = conn.WriteResponse(&base.Response{
-					StatusCode: base.StatusOK,
-					Header: base.Header{
-						"Public": base.HeaderValue{strings.Join([]string{
-							string(base.Announce),
-							string(base.Setup),
-							string(base.Record),
-							string(base.Pause),
-						}, ", ")},
-					},
-				})
-				require.NoError(t, err2)
-
-				req, err2 = conn.ReadRequest()
-				require.NoError(t, err2)
-				require.Equal(t, base.Announce, req.Method)
-
-				err2 = conn.WriteResponse(&base.Response{
-					StatusCode: base.StatusOK,
-				})
-				require.NoError(t, err2)
-
-				req, err2 = conn.ReadRequest()
-				require.NoError(t, err2)
-				require.Equal(t, base.Setup, req.Method)
-
-				var inTH headers.Transport
-				err2 = inTH.Unmarshal(req.Header["Transport"])
-				require.NoError(t, err2)
-
-				th := headers.Transport{
-					Delivery: deliveryPtr(headers.TransportDeliveryUnicast),
-				}
-
-				if transport == "udp" {
-					th.Protocol = headers.TransportProtocolUDP
-					th.ServerPorts = &[2]int{34556, 34557}
-					th.ClientPorts = inTH.ClientPorts
-				} else {
-					th.Protocol = headers.TransportProtocolTCP
-					th.InterleavedIDs = inTH.InterleavedIDs
-				}
-
-				err2 = conn.WriteResponse(&base.Response{
-					StatusCode: base.StatusOK,
-					Header: base.Header{
-						"Transport": th.Marshal(),
-					},
-				})
-				require.NoError(t, err2)
-
-				req, err2 = conn.ReadRequest()
-				require.NoError(t, err2)
-				require.Equal(t, base.Record, req.Method)
-
-				err2 = conn.WriteResponse(&base.Response{
-					StatusCode: base.StatusOK,
-				})
-				require.NoError(t, err2)
-
-				req, err2 = readRequestIgnoreFrames(conn)
-				require.NoError(t, err2)
-				require.Equal(t, base.Pause, req.Method)
-
-				err2 = conn.WriteResponse(&base.Response{
-					StatusCode: base.StatusOK,
-				})
-				require.NoError(t, err2)
-			}()
-
-			c := Client{
-				Transport: func() *Transport {
-					if transport == "udp" {
-						v := TransportUDP
-						return &v
-					}
-					v := TransportTCP
-					return &v
-				}(),
-			}
-
-			medi := testH264Media
-			medias := []*description.Media{medi}
-
-			err = record(&c, "rtsp://localhost:8554/teststream", medias, nil)
-			require.NoError(t, err)
-
-			writerDone := make(chan struct{})
-			go func() {
-				defer close(writerDone)
-
-				t := time.NewTicker(50 * time.Millisecond)
-				defer t.Stop()
-
-				for range t.C {
-					err2 := c.WritePacketRTP(medi, &testRTPPacket)
-					if err2 != nil {
-						return
-					}
-				}
-			}()
-
-			time.Sleep(1 * time.Second)
-
-			_, err = c.Pause()
-			require.NoError(t, err)
-
-			c.Close()
-			<-writerDone
-		})
-	}
-}
-
 func TestClientRecordAutomaticProtocol(t *testing.T) {
 	l, err := net.Listen("tcp", "localhost:8554")
 	require.NoError(t, err)

server_conn.go

@@ -63,10 +63,9 @@ type ServerConn struct {
 	bc         *bytecounter.ByteCounter
 	conn       *conn.Conn
 	session    *ServerSession
+	reader     *serverConnReader
 
 	// in
-	chReadRequest   chan readReq
-	chReadError     chan error
 	chRemoveSession chan *ServerSession
 
 	// out
@@ -84,8 +83,6 @@ func (sc *ServerConn) initialize() {
 	sc.ctx = ctx
 	sc.ctxCancel = ctxCancel
 	sc.remoteAddr = sc.nconn.RemoteAddr().(*net.TCPAddr)
-	sc.chReadRequest = make(chan readReq)
-	sc.chReadError = make(chan error)
 	sc.chRemoveSession = make(chan *ServerSession)
 	sc.done = make(chan struct{})
 
@@ -142,10 +139,10 @@ func (sc *ServerConn) run() {
 	}
 
 	sc.conn = conn.NewConn(sc.bc)
-	cr := &serverConnReader{
+	sc.reader = &serverConnReader{
 		sc: sc,
 	}
-	cr.initialize()
+	sc.reader.initialize()
 
 	err := sc.runInner()
 
@@ -153,7 +150,9 @@ func (sc *ServerConn) run() {
 
 	sc.nconn.Close()
 
-	cr.wait()
+	if sc.reader != nil {
+		sc.reader.wait()
+	}
 
 	if sc.session != nil {
 		sc.session.removeConn(sc)
@@ -172,10 +171,11 @@ func (sc *ServerConn) run() {
 func (sc *ServerConn) runInner() error {
 	for {
 		select {
-		case req := <-sc.chReadRequest:
+		case req := <-sc.reader.chRequest:
 			req.res <- sc.handleRequestOuter(req.req)
 
-		case err := <-sc.chReadError:
+		case err := <-sc.reader.chError:
+			sc.reader = nil
 			return err
 
 		case ss := <-sc.chRemoveSession:
@@ -446,20 +446,3 @@ func (sc *ServerConn) removeSession(ss *ServerSession) {
 	case <-sc.ctx.Done():
 	}
 }
-
-func (sc *ServerConn) readRequest(req readReq) error {
-	select {
-	case sc.chReadRequest <- req:
-		return <-req.res
-
-	case <-sc.ctx.Done():
-		return liberrors.ErrServerTerminated{}
-	}
-}
-
-func (sc *ServerConn) readError(err error) {
-	select {
-	case sc.chReadError <- err:
-	case <-sc.ctx.Done():
-	}
-}

server_conn_reader.go

@@ -2,6 +2,7 @@ package gortsplib
 
 import (
 	"errors"
+	"fmt"
 	"sync/atomic"
 	"time"
 
@@ -25,26 +26,35 @@ func isSwitchReadFuncError(err error) bool {
 type serverConnReader struct {
 	sc *ServerConn
 
-	chReadDone chan struct{}
+	chRequest chan readReq
+	chError   chan error
 }
 
 func (cr *serverConnReader) initialize() {
-	cr.chReadDone = make(chan struct{})
+	cr.chRequest = make(chan readReq)
+	cr.chError = make(chan error)
 
 	go cr.run()
 }
 
 func (cr *serverConnReader) wait() {
-	<-cr.chReadDone
+	for {
+		select {
+		case <-cr.chError:
+			return
+
+		case req := <-cr.chRequest:
+			req.res <- fmt.Errorf("terminated")
+		}
+	}
 }
 
 func (cr *serverConnReader) run() {
-	defer close(cr.chReadDone)
-
 	readFunc := cr.readFuncStandard
 
 	for {
 		err := readFunc()
+
 		var eerr switchReadFuncError
 		if errors.As(err, &eerr) {
 			if eerr.tcp {
@@ -55,7 +65,7 @@ func (cr *serverConnReader) run() {
 			continue
 		}
 
-		cr.sc.readError(err)
+		cr.chError <- err
 		break
 	}
 }
@@ -74,7 +84,9 @@ func (cr *serverConnReader) readFuncStandard() error {
 		case *base.Request:
 			cres := make(chan error)
 			req := readReq{req: what, res: cres}
-			err := cr.sc.readRequest(req)
+			cr.chRequest <- req
+
+			err := <-cres
 			if err != nil {
 				return err
 			}
@@ -108,7 +120,9 @@ func (cr *serverConnReader) readFuncTCP() error {
 		case *base.Request:
 			cres := make(chan error)
 			req := readReq{req: what, res: cres}
-			err := cr.sc.readRequest(req)
+			cr.chRequest <- req
+
+			err := <-cres
 			if err != nil {
 				return err
 			}

server_multicast_writer.go

@@ -11,7 +11,7 @@ type serverMulticastWriter struct {
 
 	rtpl     *serverUDPListener
 	rtcpl    *serverUDPListener
-	writer   asyncProcessor
+	writer   *asyncProcessor
 	rtpAddr  *net.UDPAddr
 	rtcpAddr *net.UDPAddr
 }
@@ -48,7 +48,10 @@ func (h *serverMulticastWriter) initialize() error {
 	h.rtpAddr = rtpAddr
 	h.rtcpAddr = rtcpAddr
 
-	h.writer.allocateBuffer(h.s.WriteQueueSize)
+	h.writer = &asyncProcessor{
+		bufferSize: h.s.WriteQueueSize,
+	}
+	h.writer.initialize()
 	h.writer.start()
 
 	return nil
@@ -65,8 +68,8 @@ func (h *serverMulticastWriter) ip() net.IP {
 }
 
 func (h *serverMulticastWriter) writePacketRTP(payload []byte) error {
-	ok := h.writer.push(func() {
+	ok := h.writer.push(func() error {
-		h.rtpl.write(payload, h.rtpAddr) //nolint:errcheck
+		return h.rtpl.write(payload, h.rtpAddr)
 	})
 	if !ok {
 		return liberrors.ErrServerWriteQueueFull{}
@@ -76,8 +79,8 @@ func (h *serverMulticastWriter) writePacketRTP(payload []byte) error {
 }
 
 func (h *serverMulticastWriter) writePacketRTCP(payload []byte) error {
-	ok := h.writer.push(func() {
+	ok := h.writer.push(func() error {
-		h.rtcpl.write(payload, h.rtcpAddr) //nolint:errcheck
+		return h.rtcpl.write(payload, h.rtcpAddr)
 	})
 	if !ok {
 		return liberrors.ErrServerWriteQueueFull{}

server_play_test.go

@@ -765,7 +765,7 @@ func TestServerPlay(t *testing.T) {
 			var l1 net.PacketConn
 			var l2 net.PacketConn
 
-			switch transport {
+			switch transport { //nolint:dupl
 			case "udp":
 				require.Equal(t, headers.TransportProtocolUDP, th.Protocol)
 				require.Equal(t, headers.TransportDeliveryUnicast, *th.Delivery)
@@ -942,6 +942,186 @@ func TestServerPlay(t *testing.T) {
 	}
 }
 
+func TestServerPlaySocketError(t *testing.T) {
+	for _, transport := range []string{
+		"udp",
+		"multicast",
+		"tcp",
+		"tls",
+	} {
+		t.Run(transport, func(t *testing.T) {
+			var stream *ServerStream
+			connClosed := make(chan struct{})
+			writeDone := make(chan struct{})
+			listenIP := multicastCapableIP(t)
+
+			s := &Server{
+				Handler: &testServerHandler{
+					onConnClose: func(_ *ServerHandlerOnConnCloseCtx) {
+						close(connClosed)
+					},
+					onDescribe: func(_ *ServerHandlerOnDescribeCtx) (*base.Response, *ServerStream, error) {
+						return &base.Response{
+							StatusCode: base.StatusOK,
+						}, stream, nil
+					},
+					onSetup: func(_ *ServerHandlerOnSetupCtx) (*base.Response, *ServerStream, error) {
+						return &base.Response{
+							StatusCode: base.StatusOK,
+						}, stream, nil
+					},
+					onPlay: func(_ *ServerHandlerOnPlayCtx) (*base.Response, error) {
+						go func() {
+							defer close(writeDone)
+
+							t := time.NewTicker(50 * time.Millisecond)
+							defer t.Stop()
+
+							for range t.C {
+								err := stream.WritePacketRTP(stream.Description().Medias[0], &testRTPPacket)
+								if err != nil {
+									return
+								}
+							}
+						}()
+
+						return &base.Response{
+							StatusCode: base.StatusOK,
+						}, nil
+					},
+				},
+				RTSPAddress: listenIP + ":8554",
+			}
+
+			switch transport {
+			case "udp":
+				s.UDPRTPAddress = "127.0.0.1:8000"
+				s.UDPRTCPAddress = "127.0.0.1:8001"
+
+			case "multicast":
+				s.MulticastIPRange = "224.1.0.0/16"
+				s.MulticastRTPPort = 8000
+				s.MulticastRTCPPort = 8001
+
+			case "tls":
+				cert, err := tls.X509KeyPair(serverCert, serverKey)
+				require.NoError(t, err)
+				s.TLSConfig = &tls.Config{Certificates: []tls.Certificate{cert}}
+			}
+
+			err := s.Start()
+			require.NoError(t, err)
+			defer s.Close()
+
+			stream = NewServerStream(s, &description.Session{Medias: []*description.Media{testH264Media}})
+
+			func() {
+				nconn, err := net.Dial("tcp", listenIP+":8554")
+				require.NoError(t, err)
+				defer nconn.Close()
+
+				nconn = func() net.Conn {
+					if transport == "tls" {
+						return tls.Client(nconn, &tls.Config{InsecureSkipVerify: true})
+					}
+					return nconn
+				}()
+				conn := conn.NewConn(nconn)
+
+				desc := doDescribe(t, conn)
+
+				inTH := &headers.Transport{
+					Mode: transportModePtr(headers.TransportModePlay),
+				}
+
+				switch transport {
+				case "udp":
+					v := headers.TransportDeliveryUnicast
+					inTH.Delivery = &v
+					inTH.Protocol = headers.TransportProtocolUDP
+					inTH.ClientPorts = &[2]int{35466, 35467}
+
+				case "multicast":
+					v := headers.TransportDeliveryMulticast
+					inTH.Delivery = &v
+					inTH.Protocol = headers.TransportProtocolUDP
+
+				default:
+					v := headers.TransportDeliveryUnicast
+					inTH.Delivery = &v
+					inTH.Protocol = headers.TransportProtocolTCP
+					inTH.InterleavedIDs = &[2]int{5, 6} // odd value
+				}
+
+				res, th := doSetup(t, conn, mediaURL(t, desc.BaseURL, desc.Medias[0]).String(), inTH, "")
+
+				var l1 net.PacketConn
+				var l2 net.PacketConn
+
+				switch transport { //nolint:dupl
+				case "udp":
+					require.Equal(t, headers.TransportProtocolUDP, th.Protocol)
+					require.Equal(t, headers.TransportDeliveryUnicast, *th.Delivery)
+
+					l1, err = net.ListenPacket("udp", listenIP+":35466")
+					require.NoError(t, err)
+					defer l1.Close()
+
+					l2, err = net.ListenPacket("udp", listenIP+":35467")
+					require.NoError(t, err)
+					defer l2.Close()
+
+				case "multicast":
+					require.Equal(t, headers.TransportProtocolUDP, th.Protocol)
+					require.Equal(t, headers.TransportDeliveryMulticast, *th.Delivery)
+
+					l1, err = net.ListenPacket("udp", "224.0.0.0:"+strconv.FormatInt(int64(th.Ports[0]), 10))
+					require.NoError(t, err)
+					defer l1.Close()
+
+					p := ipv4.NewPacketConn(l1)
+
+					var intfs []net.Interface
+					intfs, err = net.Interfaces()
+					require.NoError(t, err)
+
+					for _, intf := range intfs {
+						err = p.JoinGroup(&intf, &net.UDPAddr{IP: *th.Destination})
+						require.NoError(t, err)
+					}
+
+					l2, err = net.ListenPacket("udp", "224.0.0.0:"+strconv.FormatInt(int64(th.Ports[1]), 10))
+					require.NoError(t, err)
+					defer l2.Close()
+
+					p = ipv4.NewPacketConn(l2)
+
+					intfs, err = net.Interfaces()
+					require.NoError(t, err)
+
+					for _, intf := range intfs {
+						err = p.JoinGroup(&intf, &net.UDPAddr{IP: *th.Destination})
+						require.NoError(t, err)
+					}
+
+				default:
+					require.Equal(t, headers.TransportProtocolTCP, th.Protocol)
+					require.Equal(t, headers.TransportDeliveryUnicast, *th.Delivery)
+				}
+
+				session := readSession(t, res)
+
+				doPlay(t, conn, "rtsp://"+listenIP+":8554/teststream", session)
+			}()
+
+			<-connClosed
+
+			stream.Close()
+			<-writeDone
+		})
+	}
+}
+
 func TestServerPlayDecodeErrors(t *testing.T) {
 	for _, ca := range []struct {
 		proto string

server_session.go

@@ -252,7 +252,7 @@ type ServerSession struct {
 	announcedDesc         *description.Session // publish
 	udpLastPacketTime     *int64               // publish
 	udpCheckStreamTimer   *time.Timer
-	writer                asyncProcessor
+	writer                *asyncProcessor
 	timeDecoder           *rtptime.GlobalDecoder2
 
 	// in
@@ -425,12 +425,14 @@ func (ss *ServerSession) run() {
 		ss.setuppedStream.readerRemove(ss)
 	}
 
-	ss.writer.stop()
-
 	for _, sm := range ss.setuppedMedias {
 		sm.stop()
 	}
 
+	if ss.writer != nil {
+		ss.writer.stop()
+	}
+
 	ss.s.closeSession(ss)
 
 	if h, ok := ss.s.Handler.(ServerHandlerOnSessionClose); ok {
@@ -443,6 +445,13 @@ func (ss *ServerSession) run() {
 
 func (ss *ServerSession) runInner() error {
 	for {
+		chWriterError := func() chan error {
+			if ss.writer != nil {
+				return ss.writer.chError
+			}
+			return nil
+		}()
+
 		select {
 		case req := <-ss.chHandleRequest:
 			ss.lastRequestTime = ss.s.timeNow()
@@ -539,6 +548,9 @@ func (ss *ServerSession) runInner() error {
 
 			ss.udpCheckStreamTimer = time.NewTimer(ss.s.checkStreamPeriod)
 
+		case err := <-chWriterError:
+			return err
+
 		case <-ss.ctx.Done():
 			return liberrors.ErrServerTerminated{}
 		}
@@ -930,7 +942,10 @@ func (ss *ServerSession) handleRequestInner(sc *ServerConn, req *base.Request) (
 		// inside the callback.
 		if ss.state != ServerSessionStatePlay &&
 			*ss.setuppedTransport != TransportUDPMulticast {
-			ss.writer.allocateBuffer(ss.s.WriteQueueSize)
+			ss.writer = &asyncProcessor{
+				bufferSize: ss.s.WriteQueueSize,
+			}
+			ss.writer.initialize()
 		}
 
 		res, err := sc.s.Handler.(ServerHandlerOnPlay).OnPlay(&ServerHandlerOnPlayCtx{
@@ -1023,7 +1038,10 @@ func (ss *ServerSession) handleRequestInner(sc *ServerConn, req *base.Request) (
 		// when recording, writeBuffer is only used to send RTCP receiver reports,
 		// that are much smaller than RTP packets and are sent at a fixed interval.
 		// decrease RAM consumption by allocating less buffers.
-		ss.writer.allocateBuffer(8)
+		ss.writer = &asyncProcessor{
+			bufferSize: 8,
+		}
+		ss.writer.initialize()
 
 		res, err := ss.s.Handler.(ServerHandlerOnRecord).OnRecord(&ServerHandlerOnRecordCtx{
 			Session: ss,
@@ -1087,16 +1105,18 @@ func (ss *ServerSession) handleRequestInner(sc *ServerConn, req *base.Request) (
 			return res, err
 		}
 
+		if ss.state == ServerSessionStatePlay || ss.state == ServerSessionStateRecord {
 			if ss.setuppedStream != nil {
 				ss.setuppedStream.readerSetInactive(ss)
 			}
 
-		ss.writer.stop()
-
 			for _, sm := range ss.setuppedMedias {
 				sm.stop()
 			}
 
+			ss.writer.stop()
+			ss.writer = nil
+
 			ss.timeDecoder = nil
 
 			switch ss.state {
@@ -1127,6 +1147,7 @@ func (ss *ServerSession) handleRequestInner(sc *ServerConn, req *base.Request) (
 
 				ss.state = ServerSessionStatePreRecord
 			}
+		}
 
 		return res, err
 

server_session_media.go

@@ -27,8 +27,8 @@ type serverSessionMedia struct {
 	tcpRTCPFrame           *base.InterleavedFrame
 	tcpBuffer              []byte
 	formats                map[uint8]*serverSessionFormat // record only
-	writePacketRTPInQueue  func([]byte)
+	writePacketRTPInQueue  func([]byte) error
-	writePacketRTCPInQueue func([]byte)
+	writePacketRTCPInQueue func([]byte) error
 }
 
 func (sm *serverSessionMedia) initialize() {
@@ -115,33 +115,33 @@ func (sm *serverSessionMedia) findFormatWithSSRC(ssrc uint32) *serverSessionForm
 	return nil
 }
 
-func (sm *serverSessionMedia) writePacketRTPInQueueUDP(payload []byte) {
+func (sm *serverSessionMedia) writePacketRTPInQueueUDP(payload []byte) error {
 	atomic.AddUint64(sm.ss.bytesSent, uint64(len(payload)))
-	sm.ss.s.udpRTPListener.write(payload, sm.udpRTPWriteAddr) //nolint:errcheck
+	return sm.ss.s.udpRTPListener.write(payload, sm.udpRTPWriteAddr)
 }
 
-func (sm *serverSessionMedia) writePacketRTCPInQueueUDP(payload []byte) {
+func (sm *serverSessionMedia) writePacketRTCPInQueueUDP(payload []byte) error {
 	atomic.AddUint64(sm.ss.bytesSent, uint64(len(payload)))
-	sm.ss.s.udpRTCPListener.write(payload, sm.udpRTCPWriteAddr) //nolint:errcheck
+	return sm.ss.s.udpRTCPListener.write(payload, sm.udpRTCPWriteAddr)
 }
 
-func (sm *serverSessionMedia) writePacketRTPInQueueTCP(payload []byte) {
+func (sm *serverSessionMedia) writePacketRTPInQueueTCP(payload []byte) error {
 	atomic.AddUint64(sm.ss.bytesSent, uint64(len(payload)))
 	sm.tcpRTPFrame.Payload = payload
 	sm.ss.tcpConn.nconn.SetWriteDeadline(time.Now().Add(sm.ss.s.WriteTimeout))
-	sm.ss.tcpConn.conn.WriteInterleavedFrame(sm.tcpRTPFrame, sm.tcpBuffer) //nolint:errcheck
+	return sm.ss.tcpConn.conn.WriteInterleavedFrame(sm.tcpRTPFrame, sm.tcpBuffer)
 }
 
-func (sm *serverSessionMedia) writePacketRTCPInQueueTCP(payload []byte) {
+func (sm *serverSessionMedia) writePacketRTCPInQueueTCP(payload []byte) error {
 	atomic.AddUint64(sm.ss.bytesSent, uint64(len(payload)))
 	sm.tcpRTCPFrame.Payload = payload
 	sm.ss.tcpConn.nconn.SetWriteDeadline(time.Now().Add(sm.ss.s.WriteTimeout))
-	sm.ss.tcpConn.conn.WriteInterleavedFrame(sm.tcpRTCPFrame, sm.tcpBuffer) //nolint:errcheck
+	return sm.ss.tcpConn.conn.WriteInterleavedFrame(sm.tcpRTCPFrame, sm.tcpBuffer)
 }
 
 func (sm *serverSessionMedia) writePacketRTP(payload []byte) error {
-	ok := sm.ss.writer.push(func() {
+	ok := sm.ss.writer.push(func() error {
-		sm.writePacketRTPInQueue(payload)
+		return sm.writePacketRTPInQueue(payload)
 	})
 	if !ok {
 		return liberrors.ErrServerWriteQueueFull{}
@@ -151,8 +151,8 @@ func (sm *serverSessionMedia) writePacketRTP(payload []byte) error {
 }
 
 func (sm *serverSessionMedia) writePacketRTCP(payload []byte) error {
-	ok := sm.ss.writer.push(func() {
+	ok := sm.ss.writer.push(func() error {
-		sm.writePacketRTCPInQueue(payload)
+		return sm.writePacketRTCPInQueue(payload)
 	})
 	if !ok {
 		return liberrors.ErrServerWriteQueueFull{}