<?php

namespace common\behaviors;

use Yii;
use yii\base\Behavior;
use yii\web\Controller;
use yii\redis\Connection;
use yii\web\TooManyRequestsHttpException;
use common\helpers\DateHelper;

/**
 * 限制点击次数
 * 防止重复提交
 * Class CounterBehavior
 * @package common\behaviors
 * @author qimall
 */
class LimitBehavior extends Behavior
{
    /**
     * 请求方法
     *
     * @var string
     */
    public $action = "*";

    /**
     * 用户id
     *
     * @var int
     */
    public $userId = 0;

    /**
     * 过期时间，单位：秒
     *
     * @var float|int
     */
    public $second =  2;

    /**
     * key前缀
     * @var string
     */
    public $prefix = 'REQUESTLIMIT:';

    /**
     * @return array
     */
    public function events()
    {
        return [Controller::EVENT_BEFORE_ACTION => 'beforeAction'];
    }

    /**
     * @param $event
     * @throws TooManyRequestsHttpException
     */
    public function beforeAction($event)
    {
        // 只有post方式才可以需要此处理
        if ($this->userId && Yii::$app->request->isPost) {
            /** @var Connection $redis */
            $redis = Yii::$app->redis;
            // 限流: 用户 + 访问方法
            $key = $this->prefix.sprintf('hist_%s_%s', $this->userId, Yii::$app->controller->route);

            $res = $redis->set($key,1,'NX','EX',$this->second);
            if (!$res) throw new TooManyRequestsHttpException('服务器繁忙，路径：'.Yii::$app->controller->route);
        }
    }
}