redis案例 -- 商品拍卖

Posted 2021-03-16 FcLwYf

代码说明：在小程序上进行商品拍卖，多人抢拍，零秒抢拍，用redis（事物）来确认抢拍价格的准确性，什么不说了，附上代码！

    /**
     * 加价
     */
    public function plusPrice(){
        $member_id = $this->userInfo[‘member_id‘]>0 ? $this->userInfo[‘member_id‘] : 0;
        $mobile = $this->userInfo[‘member_name‘]>0 ? $this->userInfo[‘member_name‘] : 0;
        $lb_id = input(‘lb_id‘,0);
        $every_hand = input(‘price‘,0); // 每一手
        $goods_id = input(‘goods_id‘,0);
        $nickname = input(‘nickname‘,‘‘);
        $avatar = input(‘avatar‘,‘‘);
        $msg_type = input(‘msg_type‘,‘morker‘);
        $this->redis->set(‘msgType‘,$msg_type);

        // 判断参数
        if($lb_id<=0)
        {
            $this->returnmsg(‘2055‘, ‘直播ID不能为空‘);
        }
        if($goods_id<=0)
        {
            $this->returnmsg(‘2055‘, ‘商品ID不能为空‘);
        }
        if($member_id<=0)
        {
            $this->returnmsg(‘2055‘, ‘会员ID不能为空‘);
        }

        // redis事物控制价格不出问题
        $thing_key = ‘wxGoodsPlusPrice‘;
        $this->redis->setex($thing_key, 60);
        //监视keyTest
        $this->redis->watch(array($thing_key));
        $plus_max_price_key = ‘plusMaxPrices:‘.$lb_id.‘:‘.$goods_id;

        $iag_key = ‘setAuctionGoods:‘.$lb_id;
        $iag_g_info_json = $this->redis->get($iag_key);
        $iag_g_info = json_decode($iag_g_info_json,true);

        $plus_max_prices = $this->redis->lRange($plus_max_price_key,0,-1);
        $max_price = max($plus_max_prices)>0 ? max($plus_max_prices) : $iag_g_info[‘starting_price‘]; // 当没有最大价格时，取起拍价
        $price = $max_price + $every_hand;
        //开启事务
        $this->redis->multi();
        $this->redis->incr($thing_key);
        $this->redis->lPush($plus_max_price_key,$price);
        //执行事务
        $result = $this->redis->exec();
        
        // 这里很重要，后续代码一定要在事物完成这个判断里进行 ，
        // 要不然，就会出现数据错乱的问题
        if($result){
            $auction_goods_id_key = ‘auctionGoodsId:‘.$lb_id;
            $auction_goods_id = $this->redis->get($auction_goods_id_key);
            if(empty($auction_goods_id)){
                $this->redis->lPop($plus_max_price_key);
                $this->returnmsg(‘2055‘, ‘拍卖结束‘);
            }

            // 把价格重新保存一下
            if($price<=$max_price){
                $this->redis->lPop($plus_max_price_key);
                $this->returnmsg(‘2055‘, ‘不是最高价‘);
            }

            // 加入数据
            $max_price_uinfo_key = ‘maxPriceUinfoKey:‘.$lb_id.‘-‘.$goods_id;
            $old_max_price_uinfo_json = $this->redis->get($max_price_uinfo_key);
            $old_max_price_uinfo = json_decode($old_max_price_uinfo_json,true);
            if($old_max_price_uinfo[‘user_id‘] == $member_id){
                $this->redis->lPop($plus_max_price_key);
                $this->returnmsg(‘2055‘, ‘您已经领先了‘);
            }

            // 判断不要重复数据
            $unique_price_key = ‘unique_price_key:‘.$lb_id.‘:‘.$goods_id;
            $price_arr = $this->redis->lRange($unique_price_key,0,-1);
            if(!in_array($price,$price_arr)){
                $this->redis->lPush($unique_price_key,$price);
                $max_price_uinfo = array(
                    ‘user_id‘=>$member_id,
                    ‘mobile‘=>$mobile,
                    ‘max_price‘=>$price,
                    ‘goods_id‘=>$goods_id,
                    ‘lb_id‘=>$lb_id,
                    ‘nickname‘=>$nickname,
                    ‘new_avatar‘=>$avatar
                );
                $this->redis->set($max_price_uinfo_key,json_encode($max_price_uinfo,true));

                $plus_max_price_mtime_key = ‘plusMaxMtimePrices:‘.$lb_id.‘:‘.$goods_id;
                $this->redis->lPush($plus_max_price_mtime_key,$member_id.‘--‘.$price.‘--‘.$max_price.‘--‘.microtime(1));

                $mq_plus_price_consumption_key = ‘mq_plus_price_consumption‘;
                $this->redis->lPush($mq_plus_price_consumption_key,json_encode($max_price_uinfo,true));
                // QueueClient::push(new LiveImSendMsgProcessQueue(), [‘reset_name‘ => [‘live_im_send_msg‘],‘lb_id‘=>$lb_id,‘user_id‘=>$member_id,‘price‘=>$price]);
            }
        }
        $this->returnmsg(‘200‘, ‘success‘);
    }