feat: customize log level

main.go

@@ -45,6 +45,7 @@ type mailRelayConfig struct {
 	AllowedHosts      []string `json:"allowed_hosts"`
 	AllowedSenders    string   `json:"allowed_senders"`
 	TimeoutSecs       int      `json:"timeout_secs"`
+	LogLevel          string   `json:"log_level"`
 }
 
 func main() {
@@ -69,7 +70,7 @@ func run() error {
 		return err
 	}
 
-	if err := setupLogger(verbose); err != nil {
+	if err := setupLogger(verbose, appConfig.LogLevel); err != nil {
 		return err
 	}
 
@@ -137,8 +138,7 @@ func setupIPFilter(appConfig *mailRelayConfig) error {
 	return nil
 }
 
-func setupLogger(verbose bool) error {
-	logLevel := "info"
+func setupLogger(verbose bool, logLevel string) error {
 	if verbose {
 		logLevel = "debug"
 	}
@@ -213,6 +213,7 @@ func configDefaults(config *mailRelayConfig) {
 	config.AllowedHosts = []string{"*"}
 	config.AllowedSenders = "*"
 	config.TimeoutSecs = DefaultTimeoutSecs
+	config.LogLevel = "info"
 }
 
 // validateConfig validates the configuration values.

server.go

@@ -17,7 +17,7 @@ const (
 func Start(appConfig *mailRelayConfig, verbose bool) (err error) {
 	listen := fmt.Sprintf("%s:%d", appConfig.LocalListenIP, appConfig.LocalListenPort)
 
-	logLevel := "info"
+	logLevel := appConfig.LogLevel
 	if verbose {
 		logLevel = "debug"
 	}

testdata/valid.json

@@ -12,5 +12,6 @@
     "local_listen_port": 2525,
     "allowed_hosts": ["test.com", "example.com"],
     "allowed_senders": "*",
-    "timeout_secs": 60
-}
+    "timeout_secs": 60,
+    "log_level": "error"
+}