make sure all clients are closed before closing server

client.go

@@ -115,10 +115,9 @@ type client struct {
 	describe  chan describeRes
 	tcpFrame  chan *base.InterleavedFrame
 	terminate chan struct{}
-	done      chan struct{}
 }
 
-func newClient(p *program, nconn net.Conn) *client {
+func newClient(p *program, nconn net.Conn) {
 	c := &client{
 		p: p,
 		conn: gortsplib.NewConnServer(gortsplib.ConnServerConf{
@@ -132,11 +131,14 @@ func newClient(p *program, nconn net.Conn) *client {
 		describe:     make(chan describeRes),
 		tcpFrame:     make(chan *base.InterleavedFrame),
 		terminate:    make(chan struct{}),
-		done:         make(chan struct{}),
 	}
 
+	p.clients[c] = struct{}{}
+	atomic.AddInt64(p.countClients, 1)
+	c.log("connected")
+
+	p.clientsWg.Add(1)
 	go c.run()
-	return c
 }
 
 func (c *client) close() {
@@ -194,6 +196,8 @@ var errRunPlay = errors.New("play")
 var errRunRecord = errors.New("record")
 
 func (c *client) run() {
+	defer c.p.clientsWg.Done()
+
 	var onConnectCmd *externalcmd.ExternalCmd
 	if c.p.conf.RunOnConnect != "" {
 		var err error
@@ -215,7 +219,6 @@ func (c *client) run() {
 
 	close(c.describe)
 	close(c.tcpFrame)
-	close(c.done)
 }
 
 func (c *client) writeResError(cseq base.HeaderValue, code base.StatusCode, err error) {

main.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"net"
 	"os"
+	"sync"
 	"sync/atomic"
 	"time"
 
@@ -31,6 +32,7 @@ type program struct {
 	serverUdpRtcp    *serverUDP
 	serverTcp        *serverTCP
 	clients          map[*client]struct{}
+	clientsWg        sync.WaitGroup
 	udpPublishersMap *udpPublishersMap
 	readersMap       *readersMap
 	// use pointers to avoid a crash on 32bit platforms
@@ -186,6 +188,8 @@ func (p *program) log(format string, args ...interface{}) {
 }
 
 func (p *program) run() {
+	defer close(p.done)
+
 	if p.metrics != nil {
 		go p.metrics.run()
 	}
@@ -220,10 +224,7 @@ outer:
 			}
 
 		case conn := <-p.clientNew:
-			c := newClient(p, conn)
-			p.clients[c] = struct{}{}
-			atomic.AddInt64(p.countClients, 1)
-			c.log("connected")
+			newClient(p, conn)
 
 		case client := <-p.clientClose:
 			if _, ok := p.clients[client]; !ok {
@@ -352,7 +353,7 @@ outer:
 	p.readersMap.clear()
 
 	for _, p := range p.paths {
-		p.onClose(true)
+		p.onClose()
 	}
 
 	p.serverTcp.close()
@@ -367,9 +368,10 @@ outer:
 
 	for c := range p.clients {
 		c.close()
-		<-c.done
 	}
 
+	p.clientsWg.Wait()
+
 	if p.metrics != nil {
 		p.metrics.close()
 	}
@@ -389,7 +391,6 @@ outer:
 	close(p.clientRecord)
 	close(p.sourceRtspReady)
 	close(p.sourceRtspNotReady)
-	close(p.done)
 }
 
 func (p *program) close() {

path.go

@@ -77,7 +77,7 @@ func (pa *path) onInit() {
 	}
 }
 
-func (pa *path) onClose(wait bool) {
+func (pa *path) onClose() {
 	if source, ok := pa.source.(*sourceRtsp); ok {
 		close(source.terminate)
 		<-source.done
@@ -105,10 +105,6 @@ func (pa *path) onClose(wait bool) {
 				c.describe <- describeRes{nil, fmt.Errorf("publisher of path '%s' has timed out", pa.name)}
 			} else {
 				c.close()
-
-				if wait {
-					<-c.done
-				}
 			}
 		}
 	}
@@ -193,7 +189,7 @@ func (pa *path) onCheck() {
 	if pa.conf.Regexp != nil &&
 		pa.source == nil &&
 		!pa.hasClients() {
-		pa.onClose(false)
+		pa.onClose()
 		delete(pa.p.paths, pa.name)
 	}
 }

servertcp.go

@@ -34,6 +34,8 @@ func (l *serverTCP) log(format string, args ...interface{}) {
 }
 
 func (l *serverTCP) run() {
+	defer close(l.done)
+
 	for {
 		conn, err := l.listener.AcceptTCP()
 		if err != nil {
@@ -42,8 +44,6 @@ func (l *serverTCP) run() {
 
 		l.p.clientNew <- conn
 	}
-
-	close(l.done)
 }
 
 func (l *serverTCP) close() {

serverudp.go

@@ -60,6 +60,8 @@ func (l *serverUDP) log(format string, args ...interface{}) {
 }
 
 func (l *serverUDP) run() {
+	defer close(l.done)
+
 	writeDone := make(chan struct{})
 	go func() {
 		defer close(writeDone)
@@ -99,8 +101,6 @@ func (l *serverUDP) run() {
 
 	close(l.writec)
 	<-writeDone
-
-	close(l.done)
 }
 
 func (l *serverUDP) close() {

sourcertmp.go

@@ -62,6 +62,8 @@ func newSourceRtmp(p *program, path *path) *sourceRtmp {
 func (s *sourceRtmp) isSource() {}
 
 func (s *sourceRtmp) run(initialState sourceRtmpState) {
+	defer close(s.done)
+
 	s.applyState(initialState)
 
 outer:
@@ -81,7 +83,6 @@ outer:
 	}
 
 	close(s.setState)
-	close(s.done)
 }
 
 func (s *sourceRtmp) applyState(state sourceRtmpState) {

sourcertsp.go

@@ -57,6 +57,8 @@ func newSourceRtsp(p *program, path *path) *sourceRtsp {
 func (s *sourceRtsp) isSource() {}
 
 func (s *sourceRtsp) run(initialState sourceRtspState) {
+	defer close(s.done)
+
 	s.applyState(initialState)
 
 outer:
@@ -76,7 +78,6 @@ outer:
 	}
 
 	close(s.setState)
-	close(s.done)
 }
 
 func (s *sourceRtsp) applyState(state sourceRtspState) {