add reflection to gRPC server

only log to file if configured

main.go

@@ -9,6 +9,7 @@ import (
 	"github.com/rs/zerolog/log"
 	"github.com/rs/zerolog/pkgerrors"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/reflection"
 	"net"
 	"os"
 	"time"
@@ -16,7 +17,7 @@ import (
 
 type Config struct {
 	Outputs []string `yaml:"outputs"`
-	Address string   `yaml:"address" env:"ADDRESS" env-default:":3000"`
+	Address string   `yaml:"address" env:"ADDRESS" env-default:"localhost:3000"`
 	LogFile string   `yaml:"logfile" env:"LOGFILE" env-default:"./gstreamer-graphix.log"`
 }
 
@@ -28,19 +29,24 @@ func main() {
 	log.Logger = log.Output(consoleWriter).With().Timestamp().Caller().Logger()
 
 	if err := cleanenv.ReadConfig("config.toml", &cfg); err != nil {
-		log.Fatal().Msgf("No configfile: ", err)
+		log.Info().Msgf("No configfile, continuing without: ", err)
 	}
 
 	fset := flag.NewFlagSet("config", flag.ContinueOnError)
 	fset.Usage = cleanenv.FUsage(fset.Output(), &cfg, nil, fset.Usage)
 	fset.Parse(os.Args[1:])
 
-	l, err := os.OpenFile(cfg.LogFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0664)
-	multi := zerolog.MultiLevelWriter(consoleWriter, l)
-	log.Logger = zerolog.New(multi).With().Timestamp().Caller().Logger()
+	if cfg.LogFile != "" {
+		l, _ := os.OpenFile(cfg.LogFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0664)
+		multi := zerolog.MultiLevelWriter(consoleWriter, l)
+		log.Logger = zerolog.New(multi).With().Timestamp().Caller().Logger()
+	}
 
-	zerolog.ErrorStackMarshaler = pkgerrors.MarshalStack
+	if log.Logger.GetLevel() == zerolog.DebugLevel {
+		zerolog.ErrorStackMarshaler = pkgerrors.MarshalStack
+	}
 
+	log.Info().Msgf("listening on %s", cfg.Address)
 	ln, err := net.Listen("tcp", cfg.Address)
 	if err != nil {
 		log.Fatal().Err(err)
@@ -51,6 +57,7 @@ func main() {
 	pipelineService := &api.PipelineService{Gstreamer: gst}
 
 	g := grpc.NewServer()
+	reflection.Register(g)
 	api.RegisterPipelineServiceServer(g, pipelineService)
 
 	log.Fatal().Msgf("Failed to serve: %v", g.Serve(ln))