使用ApacheBench来对美多商城的秒杀功能进行高并发压力测试

#定义秒杀接口
def miaosha(request):
    res_one = News.objects.get(pk=1)
    if res_one.pd > 0:
        time.sleep(5)
        with connection.cursor() as c:
            c.execute(' update news set pd = pd - 1 where id = 1 ')
        return HttpResponse('ok')
    else:
        return HttpResponse('没有了')

r = redis.Redis(host='localhost', port=6379)


#定义过载限制
def limit_handler():
    """
    return True: 允许; False: 拒绝
    """
    amount_limit = 3  # 限制数量
    keyname = 'limit'  # redis key name
    incr_amount = 1  # 每次增加数量

    # 判断key是否存在
    if not r.exists(keyname):
        # 为了方便测试，这里设置默认初始值为95
        # setnx可以防止并发时多次设置key
        r.setnx(keyname, 0)

    # 数据插入后再判断是否大于限制数
    if r.incrby(keyname, incr_amount) <= amount_limit: 
        return True 
    return False

#定义秒杀接口
def miaosha(request):
    res_one = News.objects.get(pk=1)
    if limit_handler():
    #if res_one.pd > 0:
        time.sleep(5)
        with connection.cursor() as c:
            c.execute(' update news set pd = pd - 1 where id = 1 ')
        return HttpResponse('ok')
    else:
        return HttpResponse('没有了')