Yii API Rate Limit

PowerApiService.php

<?php
/**
 * API服务层
 *
 * 1. 接口访问频率控制（其实应该注册）
 * <code>
 * PowerApiService::rateLimit('api-do-something') && apiDoSomething();
 * </code>
 */
class PowerApiService
{
    /**
     * 接口访问频次－频次
     */
    public static $RateLimitCount = 5;
    
    /**
     * 接口访问频次－时间段
     */
    public static $RateLimitTime  = 300;
    
    /**
     * 接口限速器
     * base http://redis.readthedocs.org/en/latest/string/incr.html#id3
     */
    public static function rateLimit($apiKey = null)
    {
        if (!$apiKey) return false;

        //这里的IP地址换成Token就nice了
        $apiRunCountKey = Yii::app()->request->userHostAddress . '-' . $apiKey;

        if (self::redisInstance($apiRunCountKey)->get($apiRunCountKey) === false) {
            //初始化接口访问频次
            self::redisInstance($apiRunCountKey)->setex(
                $apiRunCountKey,
                self::$RateLimitTime,
                self::$RateLimitCount
            );
        }

        $currentApiCount = self::redisInstance($apiRunCountKey)->decr($apiRunCountKey);

        if ($currentApiCount < 0) {
            Yii::log($apiRunCountKey, 'info', 'api.rate');
            return false;
        }

        return true;
    }

    public static function redisInstance($key)
    {
        return Yii::app()->redis->getRedis($key);
    }
}