Case analysis of using php+redis to implement the flash sale function of the mall (with code)

<?php
/* 数据库配置 */
return array(
  &#39;DATA_CACHE_PREFIX&#39; => '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[&#39;goods_num&#39;]; $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！");      
     }
   }