Add capability to set loglevel to trace during runtime

Signed-off-by: Arpad Kiss <arpad.a.kiss@est.tech>

main.go

@@ -78,6 +78,8 @@ func main() {
 	// ********************************************************************************
 	// setup context to catch signals
 	// ********************************************************************************
+	logChangeChannel := make(chan os.Signal, 1)
+	signal.Notify(logChangeChannel, syscall.SIGUSR1, syscall.SIGUSR2)
 	ctx, cancel := signal.NotifyContext(
 		context.Background(),
 		os.Interrupt,
@@ -135,6 +137,7 @@ func main() {
 	logrus.SetLevel(level)
 	log.EnableTracing(true)
 	log.FromContext(ctx).WithField("duration", time.Since(now)).Infof("completed phase 1: get config from environment")
+	go handleLogChangeSignal(ctx, logChangeChannel, level)
 
 	// ********************************************************************************
 	// Configure Open Telemetry
@@ -338,6 +341,25 @@ func main() {
 	<-cleanupDoneCh
 }
 
+func handleLogChangeSignal(ctx context.Context, ch chan os.Signal, logLevel logrus.Level) {
+OUT:
+	for {
+		select {
+		case <-ctx.Done():
+			break OUT
+		case sig := <-ch:
+			switch sig {
+			case syscall.SIGUSR1:
+				log.FromContext(ctx).Infof("Setting log level to %s", logrus.TraceLevel.String())
+				logrus.SetLevel(logrus.TraceLevel)
+			case syscall.SIGUSR2:
+				log.FromContext(ctx).Infof("Setting log level to %s", logLevel.String())
+				logrus.SetLevel(logLevel)
+			}
+		}
+	}
+}
+
 func setupDeviceMap(ctx context.Context, cfg *config.Config) map[string]string {
 	if cfg.DeviceSelectorFile == "" {
 		return nil