Allow to define logger output from env

pkg/goapp/app_test.go

@@ -57,7 +57,6 @@ func TestEnvBeatsSubConfigNested(t *testing.T) {
 	assert.Equal(t, "xxxx", Sub(Config, "message").GetString("server.url"))
 }
 
-
 // the test fails as where is no option to get current env prefix from config
 // func TestEnvBeatsSeveralSubConfigNested(t *testing.T) {
 // 	os.Setenv("MESSAGE_SERVER_URL", "xxxx")
@@ -91,6 +90,21 @@ func TestLoggerLevelInitFromEnv(t *testing.T) {
 	assert.Equal(t, "trace", Log.GetLevel().String())
 }
 
+func TestLoggerOutFromEnv(t *testing.T) {
+	initDefaultLevel()
+	assert.Equal(t, os.Stdout, Log.Out)
+
+	os.Setenv("LOGGER_OUT_NAME", "stderr")
+	initAppFromTempFile(t, "logger:\n    level: info\n")
+
+	assert.Equal(t, os.Stderr, Log.Out)
+
+	os.Setenv("LOGGER_OUT_NAME", "stdout")
+	initAppFromTempFile(t, "logger:\n    level: info\n")
+
+	assert.Equal(t, os.Stdout, Log.Out)
+}
+
 func TestStartWitFlags(t *testing.T) {
 	f, err := ioutil.TempFile("", "test.*.yml")
 	assert.Nil(t, err)
@@ -123,4 +137,5 @@ func initAppFromTempFile(t *testing.T, data string) {
 
 func initDefaultLevel() {
 	Log.SetLevel(logrus.ErrorLevel)
+	Log.Out = os.Stdout
 }

pkg/goapp/log.go

@@ -25,6 +25,10 @@ func initLogFromEnv(c *logrus_mate.LoggerConfig) {
 	if ll != "" {
 		c.Level = ll
 	}
+	out := Config.GetString("logger.out.name")
+	if out != "" {
+		c.Out.Name = out
+	}
 }
 
 func initDefaultLogConfig() {