登录时密码错误次数过多，对该用户进行封禁，

本文实例讲述下当用户在3分钟内密码输入错误超过5次，封禁当前用户30分钟内不可登录

    async def get(self):
        #获取前端参数
        email = self.get_argument("email",None)
        password = self.get_argument("password",None)
        #获取计数器  redis
        number = self.application.redis.get("num_%s" % email)

        try:
            if self.application.redis.get("black_" + email):
                return self.finish({"msg": "已经被封禁稍后再试", "errcode": 4})
            #如果存在   redis
            if number:
                if int(number) > 4:
                    self.application.redis.setex("black_"+email,1800,1)
                    return self.finish({"msg": "已经被封禁稍后再试", "errcode": 5})

                    #校验账号密码
            user = await self.application.objects.get(UserModel.select().where((UserModel.email==email) & (UserModel.password == make_password(password))))

            #判断是否激活
            if user.srare ==0:
                return self.finish({"msg":"请激活该用户","errcode":2})

                #写入token
            myjwt = Myjwt()
            token = myjwt.encode({"uid":user.id,"email":user.email})
            return self.finish({"msg":"登录成功","errcode":0,"email":user.email,"token":token})
        except Exception as e:
            if number:
                self.application.redis.incr("num_%s"%email)
            else:
                self.application.redis.setex("num_%s"%email,180,1)
            return self.finish({"msg":"账号或密码不正确","errcode":3})