drf总流程

rest_framework 总流程

class APIView(View):

配置文件

renderer_classes = api_settings.DEFAULT_RENDERER_CLASSES
parser_classes = api_settings.DEFAULT_PARSER_CLASSES
authentication_classes = api_settings.DEFAULT_AUTHENTICATION_CLASSES
throttle_classes = api_settings.DEFAULT_THROTTLE_CLASSES
permission_classes = api_settings.DEFAULT_PERMISSION_CLASSES
content_negotiation_class = api_settings.DEFAULT_CONTENT_NEGOTIATION_CLASS
metadata_class = api_settings.DEFAULT_METADATA_CLASS
versioning_class = api_settings.DEFAULT_VERSIONING_CLASS

settings = api_settings

schema = DefaultSchema()

def dispatch(self, request, *args, **kwargs):

"""
注释
.dispatch() is pretty much the same as Django's regular dispatch,
but with extra hooks for startup, finalize, and exception handling.
"""

1，封装args，和kwargs

self.args = args
self.kwargs = kwargs

2，封装新的request，执行self.initialize_request(request, *args, **kwargs)函数，见下面62行

request = self.initialize_request(request, *args, **kwargs)
self.request = request

4，封装请求头

self.headers = self.default_response_headers # deprecate?
# self.headers = {'Allow': 'POST, OPTIONS', 'Vary': 'Accept'}

try:
# 5，执行initial 方法，详见下面78行
self.initial(request, *args, **kwargs)

6，获取请求方式

Get the appropriate handler method，

http_method_names = ['get', 'post', 'put', 'patch', 'delete', 'head', 'options', 'trace']

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

6，处理请求方式，会首先会找自己定义的self 的['get', 'post', 'put', 'patch', 'delete']

自己没有就基类View的['get', 'post', 'put', 'patch', 'delete']方法
response = handler(request, *args, **kwargs)

except Exception as exc:
response = self.handle_exception(exc)

8，返回最终的response对象

self.response = self.finalize_response(request, response, *args, **kwargs)
return self.response

3，封装request，新的Request返回值返回给步骤2

def initialize_request(self, request, *args, **kwargs):
"""
Returns the initial request object.
"""
parser_context = self.get_parser_context(request)

return Request(
request,

3.1 封装解析器

parsers=self.get_parsers(),

3.2 封装auth实例化对象列表

authenticators=self.get_authenticators(),

3.3，封装实例化对象列表

negotiator=self.get_content_negotiator(),
parser_context=parser_context
)

5，执行initial方法，这是整个drf的核心组件，

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)

执行内容协商并存储请求中接受的信息

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

5.1，版本信息

Determine the API version, if versioning is in use.

version, scheme = self.determine_version(request, *args, **kwargs)
request.version, request.versioning_scheme = version, scheme

5.2 用户认证

Ensure that the incoming request is permitted

self.perform_authentication(request)

5.3 权限认证

self.check_permissions(request)

5.4 限流机制

self.check_throttles(request)

配置文件

REST_FRAMEWORK = {
# 分页
"PAGE_SIZE": 2,
"DEFAULT_PAGINATION_CLASS": 'rest_framework.pagination.PageNumberPagination',

版本

"DEFAULT_VERSIONING_CLASS": 'rest_framework.versioning.URLPathVersioning',
"ALLOWED_VERSIONS": ['v1', 'v2'],
"VERSION_PARAM": 'version',

匿名用户的request.user ,request.token

"UNAUTHENTICATED_USER": None,

"UNAUTHENTICATED_TOKEN": None,

限流

"DEFAULT_THROTTLE_CLASSES": ['rest_framework.throttling.AnonRateThrottle',
'rest_framework.throttling.UserRateThrottle'],
"DEFAULT_THROTTLE_RATES": {"anon": '3/m',
"user": '3/m'},

jwt auth认证

"DEFAULT_AUTHENTICATION_CLASSES": ['myviews.extensions.auth.TokenAuthentication'],}

jwt-token期限

JWT_AUTH = {'JWT_EXPIRATION_DELTA': datetime.timedelta(seconds=300),
'JWT_REFRESH_EXPIRATION_DELTA': datetime.timedelta(days=7),}