Django中间件应用——访问频率控制

以下程序实现了应用Django中间控制网站访问频率。

import time
from django.shortcuts import render, HttpResponse
from django.utils.deprecation import MiddlewareMixin




visit_dict = {}

class Throttle(MiddlewareMixin):

    def process_request(self, request):
        # 获取IP
        ip = request.meta.get('REMOTE_ADDR')
        now = time.time()

        # 访问记录

        if not visit_dict.get(ip):
            visit_dict[ip] = []
        history = visit_dict[ip]

        # 方法一
        #  l = []
        # for i in history:
        #     if now-i < 5:
        #         l.append(i)
        # visit_dict[ip] = l
        # history = visit_dict[ip]

        # 方法二
        while history and now-history[-1]>5:
            history.pop()
        # 根据访问记录做判断
        if len(history) > 2 :
            return HttpResponse('您的访问频率过快，请稍后')

        history.insert(0, now)