• django rest framework之版本的源码流程剖析


    和之前的认证一样在initial函数中:

     1     def initial(self, request, *args, **kwargs):
     2         """
     3         Runs anything that needs to occur prior to calling the method handler.
     4         """
     5         self.format_kwarg = self.get_format_suffix(**kwargs)
     6 
     7         # Perform content negotiation and store the accepted info on the request
     8         neg = self.perform_content_negotiation(request)
     9         request.accepted_renderer, request.accepted_media_type = neg
    10 
    11         # Determine the API version, if versioning is in use.
    12         version, scheme = self.determine_version(request, *args, **kwargs) #获取version号
    13         request.version, request.versioning_scheme = version, scheme
    14 
    15         # Ensure that the incoming request is permitted
    16         self.perform_authentication(request)
    17         self.check_permissions(request)
    18         self.check_throttles(request)
    determine_version函数
    1     def determine_version(self, request, *args, **kwargs):
    2         """
    3         If versioning is being used, then determine any API version for the
    4         incoming request. Returns a two-tuple of (version, versioning_scheme)
    5         """
    6         if self.versioning_class is None: #如果没有设置version类就返回None
    7             return (None, None)
    8         scheme = self.versioning_class() #返回设置的版本类
    9         return (scheme.determine_version(request, *args, **kwargs), scheme)

    内置的路由version类

     1 class URLPathVersioning(BaseVersioning):
     2     """
     3     To the client this is the same style as `NamespaceVersioning`.
     4     The difference is in the backend - this implementation uses
     5     Django's URL keyword arguments to determine the version.
     6 
     7     An example URL conf for two views that accept two different versions.
     8 
     9     urlpatterns = [
    10         url(r'^(?P<version>[v1|v2]+)/users/$', users_list, name='users-list'), #在路由中必须这样设置
    11         url(r'^(?P<version>[v1|v2]+)/users/(?P<pk>[0-9]+)/$', users_detail, name='users-detail')
    12     ]
    13 
    14     GET /1.0/something/ HTTP/1.1
    15     Host: example.com
    16     Accept: application/json
    17     """
    18     invalid_version_message = _('Invalid version in URL path.')
    19 
    20     def determine_version(self, request, *args, **kwargs):
    21         version = kwargs.get(self.version_param, self.default_version) #获取版本号
    22         if not self.is_allowed_version(version): #校验版本号
    23             raise exceptions.NotFound(self.invalid_version_message)
    24         return version
    25 
    26     def reverse(self, viewname, args=None, kwargs=None, request=None, format=None, **extra):
    27         if request.version is not None:
    28             kwargs = {} if (kwargs is None) else kwargs
    29             kwargs[self.version_param] = request.version
    30      #反向生成URL 
    31         return super(URLPathVersioning, self).reverse(
    32             viewname, args, kwargs, request, format, **extra
    33         )
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  • 原文地址:https://www.cnblogs.com/arrow-kejin/p/9992931.html
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