allow to customize syslog prefix (#4356)

Co-authored-by: Кадышев Вячеслав <v.kadyshev@dssl.ru>

internal/conf/conf.go

@@ -161,6 +161,7 @@ type Conf struct {
 	LogLevel            LogLevel        `json:"logLevel"`
 	LogDestinations     LogDestinations `json:"logDestinations"`
 	LogFile             string          `json:"logFile"`
+	SysLogPrefix        string          `json:"sysLogPrefix"`
 	ReadTimeout         Duration        `json:"readTimeout"`
 	WriteTimeout        Duration        `json:"writeTimeout"`
 	ReadBufferCount     *int            `json:"readBufferCount,omitempty"` // deprecated
@@ -311,6 +312,7 @@ func (conf *Conf) setDefaults() {
 	conf.LogLevel = LogLevel(logger.Info)
 	conf.LogDestinations = LogDestinations{logger.DestinationStdout}
 	conf.LogFile = "mediamtx.log"
+	conf.SysLogPrefix = "mediamtx"
 	conf.ReadTimeout = 10 * Duration(time.Second)
 	conf.WriteTimeout = 10 * Duration(time.Second)
 	conf.WriteQueueSize = 512

internal/core/core.go

@@ -127,7 +127,7 @@ func New(args []string) (*Core, bool) {
 		done:           make(chan struct{}),
 	}
 
-	tempLogger, _ := logger.New(logger.Warn, []logger.Destination{logger.DestinationStdout}, "")
+	tempLogger, _ := logger.New(logger.Warn, []logger.Destination{logger.DestinationStdout}, "", "")
 
 	p.conf, p.confPath, err = conf.Load(cli.Confpath, defaultConfPaths, tempLogger)
 	if err != nil {
@@ -229,6 +229,7 @@ func (p *Core) createResources(initial bool) error {
 			logger.Level(p.conf.LogLevel),
 			p.conf.LogDestinations,
 			p.conf.LogFile,
+			p.conf.SysLogPrefix,
 		)
 		if err != nil {
 			return err
@@ -649,7 +650,8 @@ func (p *Core) closeResources(newConf *conf.Conf, calledByAPI bool) {
 	closeLogger := newConf == nil ||
 		newConf.LogLevel != p.conf.LogLevel ||
 		!reflect.DeepEqual(newConf.LogDestinations, p.conf.LogDestinations) ||
-		newConf.LogFile != p.conf.LogFile
+		newConf.LogFile != p.conf.LogFile ||
+		newConf.SysLogPrefix != p.conf.SysLogPrefix
 
 	closeAuthManager := newConf == nil ||
 		newConf.AuthMethod != p.conf.AuthMethod ||

internal/core/core_test.go

@@ -34,7 +34,8 @@ func TestCoreErrors(t *testing.T) {
 		{
 			"logger",
 			"logDestinations: [file]\n" +
-				"logFile: /nonexisting/nonexist\n",
+				"logFile: /nonexisting/nonexist\n" +
+				"sysLogPrefix: /mediamtx\n",
 		},
 		{
 			"metrics",

internal/logger/destination_syslog.go

@@ -11,8 +11,8 @@ type destinationSysLog struct {
 	buf    bytes.Buffer
 }
 
-func newDestinationSyslog() (destination, error) {
-	syslog, err := newSysLog("mediamtx")
+func newDestinationSyslog(prefix string) (destination, error) {
+	syslog, err := newSysLog(prefix)
 	if err != nil {
 		return nil, err
 	}

internal/logger/logger.go

@@ -19,7 +19,7 @@ type Logger struct {
 }
 
 // New allocates a log handler.
-func New(level Level, destinations []Destination, filePath string) (*Logger, error) {
+func New(level Level, destinations []Destination, filePath string, sysLogPrefix string) (*Logger, error) {
 	lh := &Logger{
 		level: level,
 	}
@@ -38,7 +38,7 @@ func New(level Level, destinations []Destination, filePath string) (*Logger, err
 			lh.destinations = append(lh.destinations, dest)
 
 		case DestinationSyslog:
-			dest, err := newDestinationSyslog()
+			dest, err := newDestinationSyslog(sysLogPrefix)
 			if err != nil {
 				lh.Close()
 				return nil, err