sendmail/utils.go

package main

import "reflect"

func IsPresent(slice []string, val string) bool {
	for _, item := range slice {
		if item == val {
			return true
		}
	}
	return false
}

func IsEmpty(value interface{}) bool {
	t := reflect.TypeOf(value)
	v := reflect.ValueOf(value)
	switch v.Kind() {
	case reflect.Slice:
		return v.Len() == 0
	default:
		return value == reflect.Zero(t).Interface()
	}
}

func Merge(key string, value, obj interface{}) {
	if IsEmpty(value) {
		return
	}

	field := reflect.ValueOf(obj).Elem().FieldByName(key)
	if field.CanSet() {
		switch field.Kind() {
		case reflect.Int:
			field.Set(reflect.ValueOf(value))
		case reflect.Int16:
			field.Set(reflect.ValueOf(value))
		case reflect.Int32:
			field.Set(reflect.ValueOf(value))
		case reflect.Int64:
			field.SetInt(value.(int64))
		case reflect.Bool:
			field.SetBool(value.(bool))
		case reflect.String:
			field.SetString(value.(string))
		case reflect.Slice:
			field.Set(reflect.ValueOf(value))
		case reflect.Ptr:
			field.Set(reflect.ValueOf(value))
		default:
			Merge(key, value, field)
		}
	}
}