composer: add json log formatting

Configurable via config file/env

cmd/osbuild-composer/config.go

@@ -10,10 +10,11 @@ import (
 )
 
 type ComposerConfigFile struct {
-	Koji     KojiAPIConfig   `toml:"koji"`
-	Worker   WorkerAPIConfig `toml:"worker"`
-	WeldrAPI WeldrAPIConfig  `toml:"weldr_api"`
-	LogLevel string          `toml:"log_level"`
+	Koji      KojiAPIConfig   `toml:"koji"`
+	Worker    WorkerAPIConfig `toml:"worker"`
+	WeldrAPI  WeldrAPIConfig  `toml:"weldr_api"`
+	LogLevel  string          `toml:"log_level"`
+	LogFormat string          `toml:"log_format"`
 }
 
 type KojiAPIConfig struct {
@@ -104,6 +105,8 @@ func GetDefaultConfig() *ComposerConfigFile {
 				},
 			},
 		},
+		LogLevel:  "info",
+		LogFormat: "text",
 	}
 }
 

cmd/osbuild-composer/config_test.go

@@ -59,6 +59,7 @@ func TestDefaultConfig(t *testing.T) {
 	}
 
 	require.Equal(t, expectedWeldrAPIConfig, defaultConfig.WeldrAPI)
+	require.Equal(t, "text", defaultConfig.LogFormat)
 }
 
 func TestConfig(t *testing.T) {

cmd/osbuild-composer/main.go

@@ -42,6 +42,15 @@ func main() {
 		logrus.Info("Failed to load loglevel from config:", err)
 	}
 
+	switch config.LogFormat {
+	case "text":
+		logrus.SetFormatter(&logrus.TextFormatter{})
+	case "json":
+		logrus.SetFormatter(&logrus.JSONFormatter{})
+	default:
+		logrus.Infof("Failed to set logging format from config, '%s' is not a valid option", config.LogFormat)
+	}
+
 	logrus.Info("Loaded configuration:")
 	err = DumpConfig(*config, logrus.StandardLogger().WriterLevel(logrus.InfoLevel))
 	if err != nil {