thinkphp+redis实现秒杀功能

<?php
/* 数据库配置 */
return array(
    'DATA_CACHE_PREFIX' => 'Redis_',//缓存前缀
    'DATA_CACHE_TYPE'=>'Redis',//默认动态缓存为Redis
    'DATA_CACHE_TIMEOUT' => false,
    'REDIS_RW_SEPARATE' => true, //Redis读写分离 true 开启
    'REDIS_HOST'=>'127.0.0.1', //redis服务器ip，多台用逗号隔开；读写分离开启时，第一台负责写，其它[随机]负责读；
    'REDIS_PORT'=>'6379',//端口号
    'REDIS_TIMEOUT'=>'300',//超时时间
    'REDIS_PERSISTENT'=>false,//是否长连接 false=短连接
    'REDIS_AUTH'=>'',//AUTH认证密码 
);
?>

/**
        * redis连接
        * @access private
        * @return resource
        * @author bieanju
        */
    private function connectRedis(){
        $redis=new \Redis();
        $redis->connect(C("REDIS_HOST"),C("REDIS_PORT"));       
        return $redis;
    }

//现在初始化里面定义后边要使用的redis参数
public function _initialize(){
        parent::_initialize();
        $goods_id = I("goods_id",'0','intval');      
        if($goods_id){
            $this->goods_id = $goods_id;
            $this->user_queue_key = "goods_".$goods_id."_user";//当前商品队列的用户情况
            $this->goods_number_key = "goods".$goods_id;//当前商品的库存队列
        }
        $this->user_id = $this->user_id ? $this->user_id : $_SESSION['uid'];      
    }

/**
    * 访问产品前先将当前产品库存队列
    * @access public
    * @author bieanju
    */
    public function _before_detail(){
        $where['goods_id'] = $this->goods_id;
        $where['start_time'] = array("lt",time());
        $where['end_time'] =  array("gt",time());
        $goods = M("goods")->where($where)->field('goods_num,start_time,end_time')->find();
        !$goods && $this->error("当前秒杀已结束！");
        if($goods['goods_num'] > $goods['order_num']){
            $redis = $this->connectRedis();
            $getUserRedis = $redis->hGetAll("{$this->user_queue_key}");
            $gnRedis = $redis->llen("{$this->goods_number_key}");
            /* 如果没有会员进来队列库存 */
            if(!count($getUserRedis) && !$gnRedis){            
                for ($i = 0; $i < $goods['goods_num']; $i ++) {
                    $redis->lpush("{$this->goods_number_key}", 1);
                }
            }
            $resetRedis = $redis->llen("{$this->goods_number_key}");
            if(!$resetRedis){
                $this->error("系统繁忙，请稍后抢购！");
            }
        }else{
            $this->error("当前产品已经秒杀完！");
        }
         

/**
     * 抢购商品前处理当前会员是否进入队列
     * @access public
     * @author bieanju
     */
    public function goods_number_queue(){
        !$this->user_id && $this->ajaxReturn(array("status" => "-1","msg" => "请先登录"));
        $model = M("flash_sale");
        $where['goods_id'] = $this->goods_id;
        $goods_info = $model->where($where)->find();
        !$goods_info && $this->error("对不起当前商品不存在或已下架！"); 
        /* redis 队列 */  
        $redis = $this->connectRedis();
        /* 进入队列  */
        $goods_number_key = $redis->llen("{$this->goods_number_key}");
        if (!$redis->hGet("{$this->user_queue_key}", $this->user_id)) {
            $goods_number_key = $redis->lpop("{$this->goods_number_key}");
        }
         
        if($goods_number_key){
            // 判断用户是否已在队列
            if (!$redis->hGet("{$this->user_queue_key}", $this->user_id)) {
                // 插入抢购用户信息
                $userinfo = array(
                    "user_id" => $this->user_id,
                    "create_time" => time()
                );               
                $redis->hSet("{$this->user_queue_key}", $this->user_id, serialize($userinfo));
                $this->ajaxReturn(array("status" => "1"));
            }else{
                $modelCart = M("cart");
                $condition['user_id'] = $this->user_id;
                $condition['goods_id'] = $this->goods_id;
                $condition['prom_type'] = 1;
        $cartlist = $modelCart->where($condition)->count();
                if($cartlist > 0){
                    $this->ajaxReturn(array("status" => "2"));
                }else{
                  
                   $this->ajaxReturn(array("status" => "1"));
                  
                }
                 
            }
             
        }else{
            $this->ajaxReturn(array("status" => "-1","msg" => "系统繁忙,请重试！"));
        }
    }

public function clearRedis(){
         set_time_limit(0);
         $redis = $this->connectRedis();
         //$Rd = $redis->del("{$this->user_queue_key}");
         $Rd = $redis->hDel("goods49",'用户id'');
         $a = $redis->hGet("goods_49_user", '用户id');
         if(!$a){
             dump($a);
         }
         
         if($Rd == 0){
              exit("Redis队列已释放！");           
         }
     }