Use MultiWriter to write logs to syslog and console

overlord.go

@@ -397,11 +397,11 @@ func iterate() {
 func main() {
 	var syslogCfg = os.Getenv("SYSLOG_ADDRESS")
 	if len(syslogCfg) > 0 {
-		logWriter, err := syslog.Dial("udp", syslogCfg, syslog.LOG_LOCAL0|syslog.LOG_ERR, "av-balancing")
+		syslogWriter, err := syslog.Dial("udp", syslogCfg, syslog.LOG_LOCAL0|syslog.LOG_ERR, "av-balancing")
 		if err != nil {
 			panic(err)
 		}
-		log.SetOutput(doubleWriter{logWriter, os.Stdout})
+		log.SetOutput(io.MultiWriter(os.Stdout, syslogWriter))
 	}
 
 	for {
@@ -410,20 +410,6 @@ func main() {
 	}
 }
 
-// write to two io.Writer
-type doubleWriter struct {
-	a, b io.Writer
-}
-
-func (dw doubleWriter) Write(p []byte) (int, error) {
-	n, err := dw.a.Write(p)
-	if err != nil {
-		return n, err
-	}
-	n, err = dw.b.Write(p)
-	return n, err
-}
-
 // func main() {
 // 	for {
 // 		log.Println(lookupIPs("qa-site-survey-instance"))