php+redis实现商城秒杀功能

<?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！");   
   }
}