springboot+websocket实现并发抢红包功能

springboot+websocket实现并发抢红包功能

目录概述分析效果展示设计开发表结构设计发红包设计红包支付成功回调设计抢红包设计拆红包设计获取红包领取记录设计jmeter并发测试抢红包、查红包接口

概述

抢红包功能作为几大高并发场景中典型，应该如何实现？

源码地址：https://gitee.com/tech-famer/farmer-redpacket

分析

参考微信抢红包功能，将抢红包分成一下几个步骤：

发红包；主要填写红包信息，生成红包记录

红包支付回调；用户发红包支付成功后，收到微信支付付款成功的回调，生成指定数量的红包。

抢红包；用户并发抢红包。

拆红包；记录用户抢红包记录，转账抢到的红包金额。

效果展示

项目使用sessionId模拟用户，示例打开俩个浏览器窗口模拟两个用户。

设计开发

表结构设计

红包记录在 redpacket 表中，用户领取红包详情记录在 redpacket_detail 表中。

CREATE DATABASE `redpacket`;

use `redpacket`;

CREATE TABLE `redpacket`.`redpacket` (

`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',

`packet_no` varchar(32) NOT NULL COMMENT '订单号',

`amount` decimal(5,2) NOT NULL COMMENT '红包金额最高10000.00元',

`num` int(11) NOT NULL COMMENT '红包数量',

`order_status` int(4) NOT NULL DEFAULT '0' COMMENT '订单状态：0初始、1待支付、2支付成功、3取消',

`pay_seq` varchar(32) DEFAULT NULL COMMENT '支付流水号',

`create_time` datetime NOT NULL COMMENT '创建时间',

`user_id` varchar(32) NOT NULL COMMENT '用户ID',

`update_time` datetime NOT NULL COMMENT '更新时间',

`pay_time` datetime DEFAULT NULL COMMENT '支付时间',

PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='红包订单表';

CREATE TABLE `redpacket`.`redpacket_detail` (

`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',

`packet_id` bigint(20) NOT NULL COMMENT '红包ID',

`amount` decimal(5,2) NOT NULL COMMENT '红包金额',

`received` int(1) NOT NULL DEFAULT '0' COMMENT '是否领取0未领取、1已领取',

`create_time` datetime NOT NULL COMMENT '创建时间',

`update_time` datetime NOT NULL COMMENT '更新时间',

`user_id` varchar(32) DEFAULT NULL COMMENT '领取用户',

`packet_no` varchar(32) NOT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='红包详情表';

发红包设计

用户需要填写红包金额、红包数量、备注信息等，生成红包记录，微信收银台下单，返回用户支付。

public RedPacket generateRedPacket(ReqSendRedPacketsVO data,String userId) {

final BigDecimal amount = data.getAmount();

//红包数量

final Integer num = data.getNum();

//初始化订单

final RedPacket redPacket = new RedPacket();

redPacket.setPacketNo(UUID.randomUUID().toString().replace("-", ""));

redPacket.setAmount(amount);

redPacket.setNum(num);

redPacket.setUserId(userId);

Date now = new Date();

redPacket.setCreateTime(now);

redPacket.setUpdateTime(now);

int i = redPacketMapper.insertSelective(redPacket);

if (i != 1) {

throw new ServiceException("生成红包出错", ExceptionType.SYS_ERR);

}

//模拟收银台下单

String paySeq = UUID.randomUUID().toString().replace("-", "");

//拿到收银台下单结果，更新订单为待支付状态

redPacket.setOrderStatus(1);//待支付

redPacket.setPaySeq(paySeq);

i = redPacketMapper.updateByPrimaryKeySelective(redPacket);

if (i != 1) {

throw new ServiceException("生成红包出错", ExceptionType.SYS_ERR);

}

return redPacket;

}

红包支付成功回调设计

用户支付成功后，系统接收到微信回调接口。

更新红包支付状态

二倍均值法生成指定数量红包，并批量入库。 红包算法参考：java实现4种微信抢红包算法

红包总数入redis，设置红包过期时间24小时

websocket通知在线用户收到新的红包

@Transactional(rollbackFor = Exception.class)

public void dealAfterOrderPayCallback(String userId,ReqOrderPayCallbackVO data) {

RedPacketExample example = new RedPacketExample();

final String packetNo = data.getPacketNo();

final String paySeq = data.getPaySeq();

final Integer payStatus = data.getPayStatus();

example.createCriteria().andPacketNoEqualTo(packetNo)

.andPaySeqEqualTo(paySeq)

.andOrderStatusEqualTo(1);//待支付状态

//更新订单支付状态

Date now = new Date();

RedPacket updateRedPacket = new RedPacket();

updateRedPacket.setOrderStatus(payStatus);

updateRedPacket.setUpdateTime(now);

updateRedPacket.setPayTime(now);

int i = redPacketMapper.updateByExampleSelective(updateRedPacket, example);

if (i != 1) {

throw new ServiceException("订单状态更新失败", ExceptionType.SYS_ERR);

}

if (payStatus == 2) {

RedPacketExample query = new RedPacketExample();

query.createCriteria().andPacketNoEqualTo(packetNo)

.andPaySeqEqualTo(paySeq)

.andOrderStatusEqualTo(2);

final RedPacket redPacket = redPacketMapper.selectByExample(query).get(0);

final List detailList = getRedPacketDetail(redPacket.getAmount(), redPacket.getNum());

final int size = detailList.size();

if (size <= 100) {

i = detailMapper.batchInsert(detailList, redPacket);

if (size != i) {

throw new ServiceException("生成红包失败", ExceptionType.SYS_ERR);

}

} else {

int times = size % 100 == 0 ? size / 100 : (size / 100 + 1);

for (int j = 0; j < times; j++) {

int fromIndex = 100 * j;

int toIndex = 100 * (j + 1) - 1;

if (toIndex > size - 1) {

toIndex = size - 1;

}

final List subList = detailList.subList(fromIndex, toIndex);

i = detailMapper.batchInsert(subList, redPacket);

if (subList.size() != i) {

throw new ServiceException("生成红包失败", ExceptionType.SYS_ERR);

}

}

}

final String redisKey = REDPACKET_NUM_PREFIX + redPacket.getPacketNo();

String lua = "local i = redis.call('setnx',KEYS[1],ARGV[1])\r\n" +

"if i == 1 then \r\n" +

" local j = redis.call('expire',KEYS[1],ARGV[2])\r\n" +

"end \r\n" +

"return i";

//优化成lua脚本

final Long execute = redisTemplate.execute(new DefaultRedisScript<>(lua, Long.class), Arrays.asList(redisKey), size, 3600 * 24);

if (execute != 1L) {

throw new ServiceException("生成红包失败", ExceptionType.SYS_ERR);

}

//websocket通知在线用户收到新的红包

Websocket.sendMessageToUser(userId, jsONObject.toJSONString(redPacket));

}

}

/**

* 红包随机算法

*

* @param amount 红包金额

* @param num 红包数量

* @return 随机红包集合

*/

private List getRedPacketDetail(BigDecimal amount, Integer num) {

List redPacketsList = new ArrayList<>(num);

//最小红包金额

final BigDecimal min = new BigDecimal("0.01");

//最少需要红包金额

final BigDecimal bigNum = new BigDecimal(num);

final BigDecimal atLastAmount = min.multiply(bigNum);

//出去最少红包金额后剩余金额

BigDecimal remain = amount.subtract(atLastAmount);

if (remain.compareTo(BigDecimal.ZERO) == 0) {

for (int i = 0; i < num; i++) {

redPacketsList.add(min);

}

return redPacketsList;

}

final Random random = new Random();

final BigDecimal hundred = new BigDecimal("100");

final BigDecimal two = new BigDecimal("2");

BigDecimal redPacket;

for (int i = 0; i < num; i++) {

if (i == num - 1) {

redPacket = remain;

} else {

//100内随机获得的整数

final int rand = random.nextInt(100);

redPacket = new BigDecimal(rand).multiply(remain.multiply(two).divide(bigNum.subtract(new BigDecimal(i)), 2, RoundingMode.CEILING)).divide(hundred, 2, RoundingMode.FLOOR);

}

if (remain.compareTo(redPacket) > 0) {

remain = remain.subtract(redPacket);

} else {

remain = BigDecimal.ZERO;

}

redPacketsList.add(min.add(redPacket));

}

return redPacketsList;

}

页面加载成功后初始化websocket,监听后端新红包生成成功，动态添加红包到聊天窗口。

$(function (){

var websocket;

if('WebSocket' in window) {

console.log("此浏览器支持websocket");

websocket = new WebSocket("ws://127.0.0.1:8082/websocket/${session.id}");

} else if('MozWebSocket' in window) {

alert("此浏览器只支持MozWebSocket");

} else {

alert("此浏览器只支持SockJS");

}

websocket.onopen = function(evnt) {

console.log("链接服务器成功!")

};

websocket.onmessage = function(evnt) {

console.log(evnt.data);

var json = eval('('+evnt.data+ ')');

obj.addPacket(json.id,json.packetNo,json.userId)

};

websocket.onerror = function(evnt) {};

websocket.onclose = function(evnt) {

console.log("与服务器断开了链接!")

}

});

抢红包设计

抢红包设计高并发，本地单机项目，通过原子Integer控制抢红包接口并发限制为20，

private AtomicInteger receiveCount = new AtomicInteger(0);

@PostMapping("/receive")

public CommonJsonResponse receiveOne(@Validated @RequestBody CommonJsonRequest vo) {

Integer num = null;

try {

//控制并发不要超过20

if (receiveCount.get() > 20) {

return new CommonJsonResponse("9999", "太快了");

}

num = receiveCount.incrementAndGet();

final String s = orderService.receiveOne(vo.getData());

return StringUtils.isEmpty(s) ? CommonJsonResponse.ok() : new CommonJsonResponse("9999", s);

} finally {

if (num != null) {

receiveCount.decrementAndGet();

}

}

}

对于没有领取过该红包的用户，在红包没有过期且红包还有剩余的情况下，抢红包成功，记录成功标识入redis,设置标识过期时间为5秒。

public String receiveOne(ReqReceiveRedPacketVO data) {

final Long redPacketId = data.getPacketId();

final String redPacketNo = data.getPacketNo();

final String redisKey = REDPACKET_NUM_PREFIX + redPacketNo;

if (!redisTemplate.hasKey(redisKey)) {

return "红包已经过期";

}

final Integer num = (Integer) redisTemplate.opsForVaIathlaHTDClue().get(redisKey);

if (num <= 0) {

return "红包已抢完";

}

RedPacketDetailExample example = new RedPacketDetailExample();

example.createCriteria().andPacketIdEqualTo(redPacketId)

.andReceivedEqualTo(1)

.andUserIdEqualTo(data.getUserId());

final List details = detailMapper.selectByExample(example);

if (!details.isEmpty()) {

return "该红包已经领取过了";

}

final String receiveKey = REDPACKET_RECEIVE_PREFIX + redPacketNo + ":" + data.getUserId();

//优化成lua脚本

String lua = "local i = redis.call('setnx',KEYS[1],ARGV[1])\r\n" +

"if i == 1 then \r\n" +

" local j = redis.call('expire',KEYS[1],ARGV[2])\r\n" +

"end \r\n" +

"return i";

//优化成lua脚本

final Long execute = redisTemplate.execute(new DefaultRedisScript<>(lua, Long.class), Arrays.asList(receiveKey), 1, 5);

if (execute != 1L) {

return "太快了";

}

return "";

}

拆红包设计

在用户抢红包成功标识未过期的状态下，且红包未过期红包未领完时，从数据库中领取一个红包，领取成功将领取记录写入redis以供查询过期时间为48小时。

@Transactional(rollbackFor = Exception.class)

public String openRedPacket(ReqReceiveRedPacketVO data) {

final Long packetId = data.getPacketId();

final String packetNo = data.getPacketNo();

final String userId = data.getUserId();

final String redisKey = REDPACKET_NUM_PREFIX + packetNo;

Long num = null;

try {

final String receiveKey = REDPACKET_RECEIVE_PREFIX + packetNo + ":" + userId;

if (!redisTemplate.hasKey(receiveKey)) {

log.info("未获取到红包资格，packet:{},user:{}", packetNo, userId);

throw new ServiceException("红包飞走了", ExceptionType.SYS_ERR);

}

redisTemplate.delete(receiveKey);

if (!redisTemplate.hasKey(redisKey)) {

log.info("红包过期了，packet:{}", packetNo);

throw new ServiceException("红包飞走了", ExceptionType.SYS_ERR);

}

num = redisTemplate.opsForValue().increment(redisKey, -1);

if (num < 0L) {

log.info("红包领完了，packet:{}", packetNo);

throw new ServiceException("红包飞走了", ExceptionType.SYS_ERR);

}

final int i = detailMapper.receiveOne(packetId, packetNo, userId);

if (i != 1) {

log.info("红包真的领完了，packet:{}", packetNo);

throw new ServiceException("红包飞走了", ExceptionType.SYS_ERR);

}

RedPacketDetailExample example = new RedPacketDetailExample();

example.createCriteria().andPacketIdEqualTo(packetId)

.andReceivedEqualTo(1)

.andUserIdEqualTo(userId);

final List details = detailMapper.selectByExample(example);

if (details.size() != 1) {

log.info("已经领取过了，packet:{}，user:{}", packetNo, userId);

throw new ServiceException("红包飞走了", ExceptionType.SYS_ERR);

}

//处理加款

log.info("抢到红包金额{}，packet:{}，user:{}", details.get(0).getAmount(), packetNo, userId);

final String listKey = REDPACKET_LIST_PREFIX + packetNo;

redisTemplate.opsForList().leftPush(listKey,details.get(0));

redisTemplate.expire(redisKey, 48, TimeUnit.HOURS);

return "" + details.get(0).getAmount();

} catch (Exception e) {

if (num != null) {

redisTemplate.opsForValue().increment(redisKey, 1L);

}

log.warn("打开红包异常", e);

throw new ServiceException("红包飞走了", Exceptiohttp://nType.SYS_ERR);

}

}

其中 detailMapper.receiveOne(packetId, packetNo, userId); sql如下，将指定红包记录下未领取的红包更新一条未当前用户已经领取，若成功更新一条则表示领取成功，否则领取失败。

update redpacket_detail d

set received = 1,update_time = now(),user_id = #{userId,jdbcType=VARCHAR}

where received = 0

and packet_id = #{packetId,jdbcType=BIGINT}

and packet_no = #{packetNo,jdbcType=VARCHAR}

and user_id is null

limit 1

获取红包领取记录设计

直接充redis中获取用户领取记录，没有则直接获取数据库并同步至redis。

public RespReceiveListVO receiveList(ReqReceiveListVO data) {

//红包记录redisKey

final String packetNo = data.getPacketNo();

final String redisKey = REDPACKET_LIST_PREFIX + packetNo;

if (!redisTemplate.hasKey(redisKey)) {

RedPacketDetailExample example = new RedPhttp://acketDetailExample();

example.createCriteria().andPacketNoEqualTo(packetNo)

.andReceivedEqualTo(1);

final List list = detailMapper.selectByExample(example);

redisTemplate.opsForList().leftPushAll(redisKey, list);

redisTemplate.expire(redisKey, 24, TimeUnit.HOURS);

}

List retList = redisTemplate.opsForList().range(redisKey, 0, -1);

final Object collect = retList.stream().map(item -> {

final JSONObject packetDetail = (JSONObject) item;

return ReceiveRecordVO.builder()

.amount(packetDetail.getBigDecimal("amount"))

.receiveTime(packetDetail.getDate("updateTime"))

.userId(packetDetail.getString("userId"))

.packetId(packetDetail.getLong("redpacketId"))

.packetNo(packetDetail.getString("redpacketNo"))

.build();

}).collect(Collectors.toList());

return RespReceiveListVO.builder().list((List) collect).build();

}

jmeter并发测试抢红包、查红包接口

设置jmeter参数1秒中并发请求50个抢11个红包，可以看到，前面的请求都是成功的，中间并发量上来后有部分达到并发上限被拦截，后面红包抢完请求全部失败。

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