(更新时间)2021年6月5日 商城高并发秒杀系统(.NET Core版) 31-方法幂（防止用户重复下单）

/// <summary>
/// 4.4、创建订单(redis + 消息队列 + lua + 方法幂等)
/// </summary>
/// <param name="orderDto"></param>
[HttpPost]
public PaymentDto CreateOrder(SysUser sysUser, [FromForm]OrderPo orderPo)
{
    // 1、秒杀参数准备
    string ProductKey = Convert.ToString(orderPo.ProductId);// 商品key
    string SeckillLimitKey = "seckill_stock_:SeckillLimit" + orderPo.ProductCount; // 单品限流key
    string UserBuyLimitKey = "seckill_stock_:UserId" + sysUser.UserId + "ProductId" + orderPo.ProductId;// 用户购买限制key
    int productCount = orderPo.ProductCount; // 购买商品数量
    int requestCountLimits = 10; // 单品限流数量
    int seckillLimitKeyExpire = 10;// 单品限流时间
    string requestIdKey = "seckill_stock_:" + orderPo.RequestId; // requestIdKey
    string orderSn = OrderUtil.GetOrderCode();// 订单号

    // 2、执行
    var SeckillResult = RedisHelper.EvalSHA(memoryCache.Get<string>("luaSha"), ProductKey, UserBuyLimitKey, SeckillLimitKey, productCount, requestCountLimits, seckillLimitKeyExpire, requestIdKey, orderSn);
    if (!SeckillResult.ToString().Equals("1"))
    {
        throw new BizException(SeckillResult.ToString());
    }

    // 2、扣减库存(redis缓存+redis扣减)
    //seckillStockCache.SubtractSeckillStock(orderPo.ProductId, orderPo.ProductCount);

    // 3、发送订单消息到rabbitmq
    SendOrderCreateMessage(sysUser.UserId, orderSn, orderPo);

    // 6、创建支付信息
    PaymentDto paymentDto = new PaymentDto();
    paymentDto.OrderSn = orderSn;
    paymentDto.OrderTotalPrice = orderPo.OrderTotalPrice;
    paymentDto.UserId = sysUser.UserId;
    paymentDto.ProductId = orderPo.ProductId;
    paymentDto.ProductName = orderPo.ProductName;

    return paymentDto;
}

  

 

  
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对于lua文件中定义订单号上篇文章有

文章来源: codeboy.blog.csdn.net，作者：愚公搬代码，版权归原作者所有，如需转载，请联系作者。

原文链接：codeboy.blog.csdn.net/article/details/117587623