Merge branch 'issue#4'

config/conf_loader.go

@@ -31,7 +31,7 @@ func GetConfLoader() *onion.Onion {
 	localConfigFile := "./" + AppName[3:] + ".json"
 	var configFile string
 	var o *onion.Onion
-	l3 := onion.NewEnvLayerPrefix("_", EnvPrefix)
+	l3 := GetEnvVarLayer(EnvPrefix)
 	l2, err := onion.NewFileLayer(localConfigFile, nil)
 	if err == nil {
 		logger.Info().Msg("Local config file found " + localConfigFile + ", overriding default file")
@@ -54,3 +54,17 @@ func GetConfLoader() *onion.Onion {
 	}
 	return o
 }
+
+func GetEnvVarLayer(prefix string) onion.Layer {
+	envVars := make(map[string]interface{})
+
+	for _, e := range os.Environ() {
+		pair := strings.SplitN(e, "=", 2)
+		key := pair[0]
+		if strings.HasPrefix(key, prefix) {
+			envVars[strings.TrimPrefix(key, prefix)] = pair[1]
+		}
+	}
+
+	return onion.NewMapLayer(envVars)
+}