Add config option for JSON log output.

Author: brocaar

cmd/chirpstack-gateway-bridge/cmd/configfile.go

@@ -14,6 +14,9 @@ const configTemplate = `[general]
 # debug=5, info=4, warning=3, error=2, fatal=1, panic=0
 log_level={{ .General.LogLevel }}
 
+# Log in JSON format.
+log_json={{ .General.LogJSON }}
+
 # Log to syslog.
 #
 # When set to true, log messages are being written to syslog.

cmd/chirpstack-gateway-bridge/cmd/root_run.go

@@ -22,6 +22,7 @@ import (
 func run(cmd *cobra.Command, args []string) error {
 
 	tasks := []func() error{
+		setLogJSON,
 		setLogLevel,
 		setSyslog,
 		printStartMessage,
@@ -52,6 +53,13 @@ func run(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+func setLogJSON() error {
+	if config.C.General.LogJSON {
+		log.SetFormatter(&log.JSONFormatter{})
+	}
+	return nil
+}
+
 func setLogLevel() error {
 	log.SetLevel(log.Level(uint8(config.C.General.LogLevel)))
 	return nil

internal/config/config.go

@@ -7,6 +7,7 @@ import (
 // Config defines the configuration structure.
 type Config struct {
 	General struct {
+		LogJSON     bool `mapstructure:"log_json"`
 		LogLevel    int  `mapstructure:"log_level"`
 		LogToSyslog bool `mapstructure:"log_to_syslog"`
 	} `mapstructure:"general"`