django如何自己創(chuàng)建一個中間件

class MiddlewareMixin(object):
  def __init__(self, get_response=None):
    self.get_response = get_response
    super(MiddlewareMixin, self).__init__()

  def __call__(self, request):
    response = None
    if hasattr(self, 'process_request'):
      response = self.process_request(request)
    if not response:
      response = self.get_response(request)
    if hasattr(self, 'process_response'):
      response = self.process_response(request, response)
    return response

class My_middleware(MiddlewareMixin):
  def __init__(self,get_response=None):
    super().__init__(get_response)

  def process_request(self,request):
    """
    視圖函數(shù)前執(zhí)行的，一旦這里有return將到達不了視圖函數(shù)
    request是瀏覽器發(fā)過來的請求
    """
    print("視圖函數(shù)執(zhí)行前")

  def process_response(self,request,response):
    """
    視圖函數(shù)后執(zhí)行的
    request是瀏覽器發(fā)過來的請求
    response是視圖函數(shù)返回的響應
    """
    print("視圖函數(shù)執(zhí)行后")

    # 因為你拿了視圖函數(shù)的response，就算處理的業(yè)務與response無關(guān)也要返回response
    return response

MIDDLEWARE = [
  ...
  'middlewares.My_middleware'  # 寫上自己的路徑
]

before 視圖（中間件1）
before 視圖 2（中間件2）
==index==
after 視圖 2（中間件2）
after 視圖（中間件1）