Laravel8.5+微信小程序实现京东商城秒杀方案
一、商品秒杀涉及的知识点
- 鉴权策略封装
- 接口访问频次限制
- 小程序设计
- 页面防抖
- 接口调用
- 订单创建事务使用
- 超卖防御
二、订单库存系统方案(3种)
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- 下单减库存 优点是库存和订单的强一致性,商品不会卖超,但是可能导致恶意下单,影响正常流程
- 支付减库存 优点是避免恶意下单,支付和库存强一致性,但是可能出现订单无法支付,商品库存不足等问题。
- 预扣库存 预扣库存是指用户请求之后预扣库存,生成订单,在时效内支付,否则订单失效,库存还原
三、小程序秒杀页面
- 商品秒杀详情页面页面
- 该商品秒杀时间未到,则上方进行提醒秒杀商品倒计时,并且立即抢购禁用(按钮置灰)
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- 商品秒杀时间开始,则把立即秒杀按钮禁用状态改为可以点击
- 点击立即秒杀按钮要考虑页面防抖,不能重复在同一秒中重复发起N次网络请求
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四、小程序部分代码展示
- 小程序wxml代码
<view>商品秒杀页面</view> <l-countdown time-type="second" time="{{expire_time}}" bind:linend="changeBtn" /> <l-card type="primary" full="{{true}}" image="{{goods.goods.goods_image}}" title="{{goods.goods.goods_name}}"> <view> 价格:{{goods.goods.goods_price}} </view> <view> <!-- <button disabled="true" bindtap="buyGoods" >抢购</button> --> <l-button disabled="{{ btn_disable }}" bind:lintap="buyGoods" type="error" data-goods_id="{{ goods.goods.id }}">立即秒杀</l-button> </view> </l-card> 复制代码
- 小程序js代码
// pages/goods_detail/goods_detail.js import { debounce } from "../../utils/util" Page({ /** * 页面的初始数据 */ data: { goods:{}, expire_time:0, btn_disable:false }, /** * 生命周期函数--监听页面加载 */ onLoad: function (e) { //商品id let goods_id = e.goods_id; this.getGoodsDetail(goods_id) }, //获取商品详情 getGoodsDetail(goods_id){ var token = wx.getStorageSync('token') wx.request({ url: 'http://www.zfw.com/api/v1/goods_detail?goods_id='+goods_id, header: { 'Authorization': `Bearer ${token}` }, success: res => { //当前的时间戳 let now_time = Math.round(new Date().getTime() / 1000).toString(); let expire_time = res.data.data.start_time-now_time; this.setData({ goods:res.data.data, expire_time }) if(expire_time > 0){ this.setData({ btn_disable:true }) } console.log(this.data.goods) } }) }, //立即抢购 debounce此方法是引入的util工具类的页面防抖函数 buyGoods:debounce(function (e) { let goods_id = e[0].currentTarget.dataset.goods_id var token = wx.getStorageSync('token') wx.request({ url: 'http://www.zfw.com/api/v1/snap_up', header: { 'Authorization': `Bearer ${token}` }, method:"POST", data:{ goods_id }, success: res => { let code = res.statusCode.toString() if (!code.startsWith('2')){ wx.showToast({ title: '异常!', icon:1 }) } if(res.data.errorCode == 0){ wx.redirectTo({ url: '/pages/order/order', }) }else{ wx.showToast({ title: res.data.msg, }) } console.log(res.data) } }) }), changeBtn(){ this.setData({ btn_disable:false }) } }) 复制代码
- 小程序json代码,引入的自定义组件
{ "usingComponents": { "l-card":"/miniprogram_npm/lin-ui/card", "l-button":"/miniprogram_npm/lin-ui/button", "l-countdown":"/miniprogram_npm/lin-ui/countdown" } } 复制代码
五、后台业务逻辑
要考虑订单超卖,这次代码使用的redis队列实现的
<?php namespace App\Http\Controllers\Api; use App\Http\Controllers\Controller; use App\Models\Goods; use Illuminate\Http\Request; use App\Models\ActivityGoods; use Illuminate\Support\Facades\Cache; use Illuminate\Support\Facades\DB; use Illuminate\Support\Facades\Redis; use Lcobucci\JWT\Exception; class GoodsController extends Controller { //商品秒杀列表 public function activityList() { $result = ActivityGoods::with(['goods']) ->get(); return response()->json(['errorCode' => 0, 'data' => $result, 'msg' => '查询成功']); } //商品秒杀列表 public function goodsDetail(Request $request) { $goods_id = $request->get('goods_id'); $result = ActivityGoods::with(['goods']) ->where('goods_id',$goods_id) ->first(); return response()->json(['errorCode' => 0, 'data' => $result, 'msg' => '查询成功']); } //同步库存 public function syncStock() { //查出所有参与秒杀活动列表 $result = ActivityGoods::with(['goods']) ->get()->toArray(); //进行把参与秒杀的商品写入到数据库 foreach ($result as $val){ //生成对应商品库存队列 $goods = "activity_goods_".$val['goods_id']; for ($i=0; $i < $val['sku_nums']; $i++) { Redis::lpush($goods, 1); } } } //校验库存 public function checkStock(Request $request) { //获取token $token = explode(' ',$request->header('authorization'))[1]; //进行查看 $userInfo = Cache::get($token); //抢购用户id $userID = $userInfo->id; //商品id $goodsID = $request->input("goods_id"); //对应商品库存队列 $goods = "activity_goods_".$goodsID; //对应商品抢购成功用户集合 {1,3,4} $robSuccessUser = "success_user".$goodsID; //进行判断当前用户是否在抢成功的队列里面 $result = Redis::sismember($robSuccessUser,$userID); //如果你在这里面,就抢完了 if ($result) { //如果抢购成功 返回状态码,进行下单 return response()->json(['errorCode' => 20000, 'data' => '', 'msg' => '已经抢购过了']); } //减库存,把队列里面的数据从左边 头 $count = Redis::lpop($goods); if (!$count) { //如果抢购成功 返回状态码,进行下单 return response()->json(['errorCode' => 20001, 'data' => '', 'msg' => '已经抢光了哦']); } //把当前这个秒杀的uid存储到中奖的队列里set $success = Redis::sadd($robSuccessUser, $userID); if(!$success){ //已经在成功队列里了,加回库存,防止的是同个用户并发请求 Redis::lpush($goods, 1); //如果抢购成功 返回状态码,进行下单 return response()->json(['errorCode' => 20002, 'data' => '', 'msg' => '已经抢购过了']); } //如果抢购成功 返回状态码,进行下单 return response()->json(['errorCode' => 0, 'data' => '', 'msg' => '秒杀成功']); } //创建订单 public function createOrder(Request $request) { //获取token $token = explode(' ',$request->header('authorization'))[1]; //进行查看 $userInfo = Cache::get($token); //抢购用户id $userID = $userInfo->id; //商品id $goodsID = $request->input("goods_id"); //对应商品抢购成功用户集合 {1,3,4} $robSuccessUser = "success_user".$goodsID; //进行判断当前用户是否在抢成功的队列里面 $result = Redis::sismember($robSuccessUser,$userID); //如果你在这里面,就抢完了 if (!$result) { //如果抢购成功 返回状态码,进行下单 return response()->json(['errorCode' => 20003, 'data' => '', 'msg' => '手慢了!']); } DB::beginTransaction(); try{ //减库存 //生成订单 DB::commit(); //下单成功,跳转支付页面 return response()->json(['errorCode' => 0, 'data' => '', 'msg' => '下单成功!']); }catch (\Exception $e){ DB::rollBack(); } } }