Django框架中间件(Middleware)用法实例分析

from django.http import HttpResponse
from django.shortcuts import render, redirect
from django.urls import reverse
from django.utils.deprecation import MiddlewareMixin
from MidUpVcode.settings import BLACK_LIST, VIP_LIST
'''
所有的钩子函数都可以返回一个Response
一旦钩子函数返回了Response,整个请求的受理就结束了
'''
# 继承于框架中间件
class MyappMiddleware(MiddlewareMixin):
 # 中间件的初始化方法,全局执行一次
 # def __init__(self, get_response=None):
 #   super(MyappMiddleware, self).__init__()
 #   print(" MyappMiddlware __init__")
 # 下钩子于所有路由被交给路由表之前
 def process_request(self, request):
   # 获取客户端IP地址
   clientIp = request.META['REMOTE_ADDR']
   # 请求的路由
   url = request.path
   print("> process_request", request, clientIp, url)
   # # 屏蔽黑名单用户
   # 只要客户端IP在黑名单中
   # if clientIp in BLACK_LIST:
   #   直接渲染fuckoff.html并立刻返回
   #   return render(request,'fuckoff.html')
   # # 当VIP用户访问福利页面时提供更多好的服务
   # if clientIp in VIP_LIST and url=='/myapp/fuli/':
   #   return render(request, 'fuli.html', context={'imgpath': 'meinv1.jpg'})
   # 福利页必须登录了才能查看
   if url == '/myapp/fuli/' and not request.session.get('uname', None):
     return redirect(reverse('myapp:login'))
 # 下钩子于所有路由请求被交给视图函数之前
 def process_view(self, request, view_func, view_args, view_kwargs):
   print("> process_view", request, view_func, view_args, view_kwargs)
 # 理论上下钩子于所有路由请求的模板被渲染完成以后
 # 这个函数实测无法回调
 def process_template_response(self, request, response):
   print(" process_template_response", request, response)
   return response
 # 下钩子于所有路由的响应被返回之前
 def process_response(self, request, response):
   print(" process_response", request, response)
   return response
 def process_exception(self, request, exception):
   print(" process_exception", request, exception)
   return redirect('/')

class LearnAOP(MiddlewareMixin):
  def process_request(self,request):
    print('request的路径',request.GET.path)

MIDDLEWARE = [
  ...
  # 注册自定义的中间件
  'middleware.MyMiddleware.MyappMiddleware',
  ...
]