add client count to logs

README.md

@@ -84,6 +84,15 @@ To change the format, codec or compression of a stream, you can use _FFmpeg_ or
 ffmpeg -i rtsp://localhost:8554/original -c:v libx264 -preset ultrafast -tune zerolatency -b 600k -f rtsp rtsp://localhost:8554/compressed
 ```
 
+#### Counting clients
+
+The current number of clients, publishers and receivers is printed in each log line; for instance, the line:
+```
+2020/01/01 00:00:00 [2/1/1] [client 127.0.0.1:44428] OPTION
+```
+
+means that there are 2 clients, 1 publisher and 1 receiver.
+
 #### Full command-line usage
 
 ```

main.go

@@ -189,15 +189,17 @@ type args struct {
 }
 
 type program struct {
-	args       args
-	protocols  map[streamProtocol]struct{}
-	publishIps []interface{}
-	readIps    []interface{}
-	tcpl       *serverTcpListener
-	udplRtp    *serverUdpListener
-	udplRtcp   *serverUdpListener
-	clients    map[*serverClient]struct{}
-	publishers map[string]*serverClient
+	args           args
+	protocols      map[streamProtocol]struct{}
+	publishIps     []interface{}
+	readIps        []interface{}
+	tcpl           *serverTcpListener
+	udplRtp        *serverUdpListener
+	udplRtcp       *serverUdpListener
+	clients        map[*serverClient]struct{}
+	publishers     map[string]*serverClient
+	publisherCount int
+	receiverCount  int
 
 	events chan programEvent
 	done   chan struct{}
@@ -308,8 +310,6 @@ func newProgram(sargs []string) (*program, error) {
 		return nil, err
 	}
 
-	log.Printf("rtsp-simple-server %s", Version)
-
 	p := &program{
 		args:       args,
 		protocols:  protocols,
@@ -321,6 +321,8 @@ func newProgram(sargs []string) (*program, error) {
 		done:       make(chan struct{}),
 	}
 
+	p.log("rtsp-simple-server %s", Version)
+
 	p.udplRtp, err = newServerUdpListener(p, args.rtpPort, _TRACK_FLOW_RTP)
 	if err != nil {
 		return nil, err
@@ -344,6 +346,11 @@ func newProgram(sargs []string) (*program, error) {
 	return p, nil
 }
 
+func (p *program) log(format string, args ...interface{}) {
+	log.Printf("[%d/%d/%d] "+format, append([]interface{}{len(p.clients),
+		p.publisherCount, p.receiverCount}, args...)...)
+}
+
 func (p *program) run() {
 outer:
 	for rawEvt := range p.events {
@@ -351,6 +358,7 @@ outer:
 		case programEventClientNew:
 			c := newServerClient(p, evt.nconn)
 			p.clients[c] = struct{}{}
+			c.log("connected")
 
 		case programEventClientClose:
 			// already deleted
@@ -375,6 +383,15 @@ outer:
 				}
 			}
 
+			switch evt.client.state {
+			case _CLIENT_STATE_PLAY:
+				p.receiverCount -= 1
+
+			case _CLIENT_STATE_RECORD:
+				p.publisherCount -= 1
+			}
+
+			evt.client.log("disconnected")
 			close(evt.done)
 
 		case programEventClientGetStreamSdp:
@@ -444,14 +461,17 @@ outer:
 			evt.res <- nil
 
 		case programEventClientPlay2:
+			p.receiverCount += 1
 			evt.client.state = _CLIENT_STATE_PLAY
 			evt.res <- nil
 
 		case programEventClientPause:
+			p.receiverCount -= 1
 			evt.client.state = _CLIENT_STATE_PRE_PLAY
 			evt.res <- nil
 
 		case programEventClientRecord:
+			p.publisherCount += 1
 			evt.client.state = _CLIENT_STATE_RECORD
 			evt.res <- nil
 

server-client.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"log"
 	"net"
 	"os/exec"
 	"strings"
@@ -108,9 +107,7 @@ func (c *serverClient) close() {
 }
 
 func (c *serverClient) log(format string, args ...interface{}) {
-	// keep remote address outside format, since it can contain %
-	log.Println("[RTSP client " + c.conn.NetConn().RemoteAddr().String() + "] " +
-		fmt.Sprintf(format, args...))
+	c.p.log("[client %s] "+format, append([]interface{}{c.conn.NetConn().RemoteAddr().String()}, args...)...)
 }
 
 func (c *serverClient) ip() net.IP {
@@ -122,8 +119,6 @@ func (c *serverClient) zone() string {
 }
 
 func (c *serverClient) run() {
-	c.log("connected")
-
 	if c.p.args.preScript != "" {
 		preScript := exec.Command(c.p.args.preScript)
 		err := preScript.Run()
@@ -147,12 +142,15 @@ func (c *serverClient) run() {
 		}
 	}
 
-	c.log("disconnected")
-
 	if c.udpCheckStreamTicker != nil {
 		c.udpCheckStreamTicker.Stop()
 	}
 
+	go func() {
+		for range c.write {
+		}
+	}()
+
 	func() {
 		if c.p.args.postScript != "" {
 			postScript := exec.Command(c.p.args.postScript)
@@ -682,6 +680,11 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			},
 		})
 
+		// set state
+		res = make(chan error)
+		c.p.events <- programEventClientPlay2{res, c}
+		<-res
+
 		c.log("is receiving on path '%s', %d %s via %s", c.path, len(c.streamTracks), func() string {
 			if len(c.streamTracks) == 1 {
 				return "track"
@@ -689,11 +692,6 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			return "tracks"
 		}(), c.streamProtocol)
 
-		// set state
-		res = make(chan error)
-		c.p.events <- programEventClientPlay2{res, c}
-		<-res
-
 		// when protocol is TCP, the RTSP connection becomes a RTP connection
 		if c.streamProtocol == _STREAM_PROTOCOL_TCP {
 			// write RTP frames sequentially
@@ -770,6 +768,10 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			},
 		})
 
+		res := make(chan error)
+		c.p.events <- programEventClientRecord{res, c}
+		<-res
+
 		c.log("is publishing on path '%s', %d %s via %s", c.path, len(c.streamTracks), func() string {
 			if len(c.streamTracks) == 1 {
 				return "track"
@@ -777,10 +779,6 @@ func (c *serverClient) handleRequest(req *gortsplib.Request) bool {
 			return "tracks"
 		}(), c.streamProtocol)
 
-		res := make(chan error)
-		c.p.events <- programEventClientRecord{res, c}
-		<-res
-
 		// when protocol is TCP, the RTSP connection becomes a RTP connection
 		// receive RTP data and parse it
 		if c.streamProtocol == _STREAM_PROTOCOL_TCP {

server-tcpl.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"log"
 	"net"
 )
 
@@ -31,7 +30,7 @@ func newServerTcpListener(p *program) (*serverTcpListener, error) {
 }
 
 func (l *serverTcpListener) log(format string, args ...interface{}) {
-	log.Printf("[TCP listener] "+format, args...)
+	l.p.log("[TCP listener] "+format, args...)
 }
 
 func (l *serverTcpListener) run() {

server-udpl.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"log"
 	"net"
 	"time"
 )
@@ -47,7 +46,7 @@ func (l *serverUdpListener) log(format string, args ...interface{}) {
 	} else {
 		label = "RTCP"
 	}
-	log.Printf("[UDP/"+label+" listener] "+format, args...)
+	l.p.log("[UDP/"+label+" listener] "+format, args...)
 }
 
 func (l *serverUdpListener) run() {