CallMethod.go

func CallMethod(i interface{}, methodName string) interface{} {
	var ptr reflect.Value
	var value reflect.Value
	var finalMethod reflect.Value

	value = reflect.ValueOf(i)

	if value.Type().Kind() == reflect.Ptr {
		ptr = value
		value = ptr.Elem()
	} else {
		ptr = reflect.New(reflect.TypeOf(i))
		temp := ptr.Elem()
		temp.Set(value)
	}

	method := value.MethodByName(methodName)
	if method.IsValid() {
		finalMethod = method
	}

	method = ptr.MethodByName(methodName)
	if method.IsValid() {
		finalMethod = method
	}

	if finalMethod.IsValid() {
		return finalMethod.Call([]reflect.Value{})[0].Interface()
	}

	return ""
}