added config option for log level (#382)

Signed-off-by: Mikhail Avramenko <avramenkomihail15@gmail.com>

internal/config/config.go

@@ -28,4 +28,5 @@ type Config struct {
 	ListenOn         []url.URL     `default:"unix:///var/lib/networkservicemesh/nsm.io.sock" desc:"url to listen on. tcp:// one will be used a public to register NSM." split_words:"true"`
 	RegistryURL      url.URL       `default:"tcp://localhost:5001" desc:"A NSE registry url to use" split_words:"true"`
 	MaxTokenLifetime time.Duration `default:"10m" desc:"maximum lifetime of tokens" split_words:"true"`
+	LogLevel         string        `default:"INFO" desc:"Log level" split_words:"true"`
 }

main.go

@@ -82,10 +82,16 @@ func main() {
 
 	logrus.Infof("Using configuration: %v", cfg)
 
+	level, err := logrus.ParseLevel(cfg.LogLevel)
+	if err != nil {
+		logrus.Fatalf("invalid log level %s", cfg.LogLevel)
+	}
+	logrus.SetLevel(level)
+
 	// Startup is finished
 	finish()
 
-	err := manager.RunNsmgr(traceCtx, cfg)
+	err = manager.RunNsmgr(traceCtx, cfg)
 	if err != nil {
 		logrus.Fatalf("error executing rootCmd: %v", err)
 	}