• Django-Rest-Framework部分源码流程分析


    class TestView(APIView):
    
        '''
        调用这个函数的时候,会自动触发authentication_classes的运行,所以会先执行上边的类
        '''
        authentication_classes = [TestAuthentication,]
        permission_classes = []
    
    
        # def dispath(self,request,*args,**kwargs):
        #     return super().dispatch(request,*args,**kwargs)
        def get(self,request,*args,**kwargs):
            # self.dispatch()           #用户访问这个函数,首先执行里面的dispatch方法                 1,入口
            print("====request.user====",request.user)         #当前登录的用户
            print("====request.auth====",request.auth)         #获取到的用户token
            return Response("GET请求,响应内容")
    
        def post(self,request,*args,**kwargs):
            return Response("POST请求,响应内容")
    
        def put(self,request,*args,**kwargs):
            return Response("PUT请求,响应内容")
     def dispatch(self, request, *args, **kwargs):
            """
            `.dispatch()` is pretty much the same as Django's regular dispatch,
            but with extra hooks for startup, finalize, and exception handling.
            """
            self.args = args
            self.kwargs = kwargs
    
            """
            # 对request进行加工,增加了下边这几个新的功能
                parsers=self.get_parsers(),
                authenticators=self.get_authenticators(),
                negotiator=self.get_content_negotiator(),
                parser_context=parser_context
            """
            request = self.initialize_request(request, *args, **kwargs)                           
            self.request = request
            self.headers = self.default_response_headers  # deprecate?
    
            try:
                """2
                    版本处理
                    用户认证
                    权限
                    访问频率限制
                """
                self.initial(request, *args, **kwargs)
    
                # Get the appropriate handler method
                # 3,通过反射执行函数
                if request.method.lower() in self.http_method_names:
                    handler = getattr(self, request.method.lower(),
                                      self.http_method_not_allowed)
                else:
                    handler = self.http_method_not_allowed
    
                response = handler(request, *args, **kwargs)
    
            except Exception as exc:
                response = self.handle_exception(exc)
            # 4对结果再次加工
            self.response = self.finalize_response(request, response, *args, **kwargs)
            return self.response
    # 从上边进来之后首先执行他的initialize方法        ===================第一步,对request进行加工,扩展了很多的功能
    request = self.initialize_request(request, *args, **kwargs)
    self.request = request
    self.headers = self.default_response_headers  # deprecate?
    
        
    def initialize_request(self, request, *args, **kwargs):
        """
        Returns the initial request object.
        """
        parser_context = self.get_parser_context(request)
        # 对request进行加工,多了很多功能
        return Request(
            request,
            parsers=self.get_parsers(),
            authenticators=self.get_authenticators(),
            negotiator=self.get_content_negotiator(),
            parser_context=parser_context
        )
    接下来走try,执行里面的initial方法,处理版本信息,认证,权限,访问控制
    def initial(self, request, *args, **kwargs):
            """
            Runs anything that needs to occur prior to calling the method handler.
            """
            self.format_kwarg = self.get_format_suffix(**kwargs)
    
            # Perform content negotiation and store the accepted info on the request
            neg = self.perform_content_negotiation(request)
            request.accepted_renderer, request.accepted_media_type = neg
    
            # Determine the API version, if versioning is in use.
            # 处理版本信息
            version, scheme = self.determine_version(request, *args, **kwargs)
            request.version, request.versioning_scheme = version, scheme
    
            # Ensure that the incoming request is permitted
            # 认证
            self.perform_authentication(request)
            # 权限
            self.check_permissions(request)
            # 访问频率控制
            self.check_throttles(request)
    from django.views.decorators.csrf import csrf_exempt
    
    假如用这个装饰器“@csrf_exempt”装饰过的函数不需要经过csrf验证
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  • 原文地址:https://www.cnblogs.com/52-qq/p/8419189.html
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