add options logDestinations, logFile (#37)

Makefile

@@ -68,7 +68,8 @@ define CONFIG_RUN
 #rtspPort: 8555
 #rtpPort: 8002
 #rtcpPort: 8003
-metrics: yes
+#metrics: yes
+logDestinations: [stdout, file]
 
 paths:
   all:

conf.go

@@ -44,6 +44,9 @@ type conf struct {
 	authMethodsParsed     []gortsplib.AuthMethod                ``
 	Metrics               bool                                  `yaml:"metrics"`
 	Pprof                 bool                                  `yaml:"pprof"`
+	LogDestinations       []string                              `yaml:"logDestinations"`
+	logDestinationsParsed map[logDestination]struct{}           ``
+	LogFile               string                                `yaml:"logFile"`
 	Paths                 map[string]*confPath                  `yaml:"paths"`
 }
 
@@ -144,6 +147,26 @@ func loadConf(fpath string, stdin io.Reader) (*conf, error) {
 		}
 	}
 
+	if len(conf.LogDestinations) == 0 {
+		conf.LogDestinations = []string{"stdout"}
+	}
+	conf.logDestinationsParsed = make(map[logDestination]struct{})
+	for _, dest := range conf.LogDestinations {
+		switch dest {
+		case "stdout":
+			conf.logDestinationsParsed[logDestinationStdout] = struct{}{}
+
+		case "file":
+			conf.logDestinationsParsed[logDestinationFile] = struct{}{}
+
+		default:
+			return nil, fmt.Errorf("unsupported log destination: %s", dest)
+		}
+	}
+	if conf.LogFile == "" {
+		conf.LogFile = "rtsp-simple-server.log"
+	}
+
 	if len(conf.Paths) == 0 {
 		conf.Paths = map[string]*confPath{
 			"all": {},

main.go

@@ -21,6 +21,13 @@ const (
 	pprofAddress = ":9999"
 )
 
+type logDestination int
+
+const (
+	logDestinationStdout logDestination = iota
+	logDestinationFile
+)
+
 type programEvent interface {
 	isProgramEvent()
 }
@@ -161,6 +168,7 @@ func (programEventTerminate) isProgramEvent() {}
 
 type program struct {
 	conf           *conf
+	logFile        *os.File
 	metrics        *metrics
 	serverRtsp     *serverTcp
 	serverRtp      *serverUdp
@@ -202,6 +210,15 @@ func newProgram(args []string, stdin io.Reader) (*program, error) {
 		done:    make(chan struct{}),
 	}
 
+	if _, ok := p.conf.logDestinationsParsed[logDestinationFile]; ok {
+		p.logFile, err = os.OpenFile(p.conf.LogFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+		if err != nil {
+			log.Fatal("ERR:", err)
+		}
+	}
+
+	p.log("rtsp-simple-server %s", Version)
+
 	for path, confp := range conf.Paths {
 		if path == "all" {
 			continue
@@ -216,8 +233,6 @@ func newProgram(args []string, stdin io.Reader) (*program, error) {
 		}
 	}
 
-	p.log("rtsp-simple-server %s", Version)
-
 	if conf.Metrics {
 		p.metrics = newMetrics(p)
 	}
@@ -263,8 +278,15 @@ func newProgram(args []string, stdin io.Reader) (*program, error) {
 }
 
 func (p *program) log(format string, args ...interface{}) {
-	log.Printf("[%d/%d/%d] "+format, append([]interface{}{len(p.clients),
+	line := fmt.Sprintf("[%d/%d/%d] "+format, append([]interface{}{len(p.clients),
 		p.publisherCount, p.readerCount}, args...)...)
+
+	if _, ok := p.conf.logDestinationsParsed[logDestinationStdout]; ok {
+		log.Println(line)
+	}
+	if _, ok := p.conf.logDestinationsParsed[logDestinationFile]; ok {
+		p.logFile.WriteString(line + "\n")
+	}
 }
 
 func (p *program) run() {
@@ -491,6 +513,10 @@ outer:
 		p.metrics.close()
 	}
 
+	if p.logFile != nil {
+		p.logFile.Close()
+	}
+
 	close(p.events)
 	close(p.done)
 }

rtsp-simple-server.yml

@@ -21,6 +21,10 @@ authMethods: [basic, digest]
 metrics: false
 # enable pprof on port 9999 to monitor performances
 pprof: false
+# destinations of log messages; available options are 'stdout' and 'file'
+logDestinations: [stdout]
+# if 'file' is in logDestinations, this is the file that will receive the logs
+logFile: rtsp-simple-server.log
 
 # these settings are path-dependent. The settings under the path 'all' are
 # applied to all paths that do not match a specific entry.