feat: add option for setting the encoding/format for logs (#250)

waku.go

@@ -135,6 +135,12 @@ func main() {
 				Usage:       "Define the logging level, supported strings are: DEBUG, INFO, WARN, ERROR, DPANIC, PANIC, FATAL, and their lower-case forms.",
 				Destination: &options.LogLevel,
 			},
+			&cli.StringFlag{
+				Name:        "log-encoding",
+				Value:       "console",
+				Usage:       "Define the encoding used for the logs: console, json",
+				Destination: &options.LogEncoding,
+			},
 			&cli.BoolFlag{
 				Name:        "relay",
 				Value:       true,
@@ -357,6 +363,10 @@ func main() {
 				return err
 			}
 
+			// Set encoding for logs (console, json, ...)
+			// Note that libp2p reads the encoding from GOLOG_LOG_FMT env var.
+			utils.InitLogger(options.LogEncoding)
+
 			waku.Execute(options)
 			return nil
 		},

waku/options.go

@@ -122,6 +122,7 @@ type Options struct {
 	AdvertiseAddress string
 	ShowAddresses    bool
 	LogLevel         string
+	LogEncoding      string
 
 	Websocket        WSOptions
 	Relay            RelayOptions

waku/v2/utils/logger.go

@@ -1,6 +1,8 @@
 package utils
 
 import (
+	"fmt"
+
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 )
@@ -22,8 +24,14 @@ func SetLogLevel(level string) error {
 // Logger creates a zap.Logger with some reasonable defaults
 func Logger() *zap.Logger {
 	if log == nil {
+		InitLogger("console")
+	}
+	return log
+}
+
+func InitLogger(encoding string) {
 	cfg := zap.Config{
-			Encoding:         "console",
+		Encoding:         encoding,
 		Level:            atom,
 		OutputPaths:      []string{"stderr"},
 		ErrorOutputPaths: []string{"stderr"},
@@ -40,10 +48,8 @@ func Logger() *zap.Logger {
 
 	logger, err := cfg.Build()
 	if err != nil {
-			panic("could not create logger")
+		panic(fmt.Errorf("could not create logger: %s", err.Error()))
 	}
 
 	log = logger.Named("gowaku")
-	}
-	return log
 }