java 单机接口限流处理方案
232
2022-06-19
1.写视图的方法
1.1第一种:原始APIView
url(r'^login/$',account.LoginView.as_view()),
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework_jwt.settings import api_settings
from rest_framework.throttling import AnonRateThrottle
from api import models
class LoginView(APIView):
authentication_classes = []
def post(self,request,*args,**kwargs):
# 1.根据用户名和密码检测用户是否可以登录
user = models.UserInfo.objects.filter(username=request.data.get('username'),password=request.data.get('password')).first()
if not user:
return Response({'code':10001,'error':'用户名或密码错误'})
# 2. 根据user对象生成payload(中间值的数据)
jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
payload = jwt_payload_handler(user)
# 3. 构造前面数据,base64加密;中间数据base64加密;前两段拼接然后做hs256加密(加盐),再做base64加密。生成token
jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
token = jwt_encode_handler(payload)
return Response({'code': 10000, 'data': token})
1.2第二种:ListApiView等
url(r'^article/$',article.ArticleView.as_view()),
url(r'^article/(?P
from rest_framework.throttling import AnonRateThrottle
from rest_framework.response import Response
from rest_framework.generics import ListAPIView,RetrieveAPIView
from api import models
from api.serializer.article import ArticleSerializer,ArticleDetailSerializer
class ArticleView(ListAPIView):
authentication_classes = []
# throttle_classes = [AnonRateThrottle,]
queryset = models.Article.objects.all()
serializer_class = ArticleSerializer
class ArticleDetailView(RetrieveAPIView):
authentication_classes = []
queryset = models.Article.objects.all()
serializer_class = ArticleDetailSerializer
1.3第三种:
url(r'^article/$',article.ArticleView.as_view({"get":'list','post':'create'})),
url(r'^article/(?P
from rest_framework.viewsets import GenericViewSet
from rest_framework.mixins import ListModelMixin,RetrieveModelMixin,CreateModelMixin,UpdateModelMixin,DestroyModelMixin
from api.serializer.article import ArticleSerializer,ArticleDetailSerializer
class ArticleView(GenericViewSet,ListModelMixin,RetrieveModelMixin,CreateModelMixin,UpdateModelMixin,DestroyModelMixin):
authentication_classes = []
throttle_classes = [AnonRateThrottle,]
queryset = models.Article.objects.all()
serializer_class = None
def get_serializer_class(self):
pk = self.kwargs.get('pk')
if pk:
return ArticleDetailSerializer
return ArticleSerializer
2.drf 相关知识点梳理
2.1装饰器
def outer(func):
def inner(*args,**kwargs):
return func(*args,**kwargs)
return inner
@outer
def index(a1):
pass
index()
def outer(func):
def inner(*args,**kwargs):
return func(*args,**kwargs)
return inner
def index(a1):
pass
index = outer(index)
index()
2.2django中可以免除csrftoken认证
from django.views.decorators.csrf import csrf_exempt
from django.shortcuts import HttpResponse
@csrf_exempt
def index(request):
return HttpResponse('...')
# index = csrf_exempt(index)
urlpatterns = [
url(r'^index/$',index),
]
urlpatterns = [
url(r'^login/$',account.LoginView.as_view()),
]
class APIView(View):
@classmethod
def as_view(cls, **initkwargs):
view = super().as_view(**initkwargs)
view.cls = cls
view.initkwargs = initkwargs
# Note: session based authentication is explicitly CSRF validated,
# all other authentication is CSRF exempt.
return csrf_exempt(view)
2.3面向对象中基于继承+异常处理来做的约束
class BaseVersioning:
def determine_version(self, request, *args, **kwargs):
raise NotImplementedError("must be implemented")
class URLPathVersioning(BaseVersioning):
def determine_version(self, request, *args, **kwargs):
version = kwargs.get(self.version_param, self.default_version)
if version is None:
version = self.default_version
if not self.is_allowed_version(version):
raise exceptions.NotFound(self.invalid_version_message)
return version
2.4面向对象封装
class Foo(object):
def __init__(self,name,age):
self.name = name
self.age = age
obj = Foo('汪洋',18)
class APIView(View):
def dispatch(self, request, *args, **kwargs):
self.args = args
self.kwargs = kwargs
request = self.initialize_request(request, *args, **kwargs)
self.request = request
...
def initialize_request(self, request, *args, **kwargs):
"""
Returns the initial request object.
"""
parser_context = self.get_parser_context(request)
return Request( # 给request再封装一层
request,
parsers=self.get_parsers(),
authenticators=self.get_authenticators(), # [MyAuthentication(),]
negotiator=self.get_content_negotiator(),
parser_context=parser_context
)
2.5面向对象继承
class View(object):
pass
class APIView(View):
def dispatch(self):
method = getattr(self,'get')
method()
class GenericAPIView(APIView):
serilizer_class = None
def get_seriliser_class(self):
return self.serilizer_class
class ListModelMixin(object):
def get(self):
ser_class = self.get_seriliser_class()
print(ser_class)
class ListAPIView(ListModelMixin,GenericAPIView):
pass
class UserInfoView(ListAPIView):
pass
view = UserInfoView()
view.dispatch()
class View(object):
pass
class APIView(View):
def dispatch(self):
method = getattr(self,'get')
method()
class GenericAPIView(APIView):
serilizer_class = None
def get_seriliser_class(self):
return self.serilizer_class
class ListModelMixin(object):
def get(self):
ser_class = self.get_seriliser_class()
print(ser_class)
class ListAPIView(ListModelMixin,GenericAPIView):
pass
class UserInfoView(ListAPIView):
serilizer_class = "汪洋"
view = UserInfoView()
view.dispatch()
class View(object):
pass
class APIView(View):
def dispatch(self):
method = getattr(self,'get')
method()
class GenericAPIView(APIView):
serilizer_class = None
def get_seriliser_class(self):
return self.serilizer_class
class ListModelMixin(object):
def get(self):
ser_class = self.get_seriliser_class()
print(ser_class)
class ListAPIView(ListModelMixin,GenericAPIView):
pass
class UserInfoView(ListAPIView):
def get_seriliser_class(self):
return "咩咩"
view = UserInfoView()
view.dispatch()
2.6反射
class View(object):
def dispatch(self, request, *args, **kwargs):
# Try to dispatch to the right method; if a method doesn't exist,
# defer to the error handler. Also defer to the error handler if the
# request method isn't on the approved list.
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
return handler(request, *args, **kwargs)
2.7发送ajax请求
$.ajax({
url:'地址',
type:'GET',
data:{...},
success:function(arg){
console.log(arg);
}
})
简单请求,发送一次请求。
复杂请求,先options请求做预检,然后再发送真正请求
function sendMsg() {
$.ajax({
url:'/msg/',
type:'GET',
success:function (arg) {
console.log(arg);
}
})
}
function sendRemoteMsg() {
$.ajax({
url:'http://127.0.0.1:8002/json/',
type:'GET',
success:function (arg) {
console.log(arg);
}
})
}
2.8如何解决ajax+跨域?
CORS,跨站资源共享,本质:设置响应头。
2.9常见的Http请求方法
get
post
put
patch
delete
options
2.10http请求中Content-type请起头
情况一:
content-type:x-www-form-urlencode
name=alex&age=19&xx=10
request.POST和request.body中均有值。
情况二:
content-type:application/json
{"name":"ALex","Age":19}
request.POST没值
request.body有值。
2.11django中F查询
2.12django中获取空Queryset
models.User.object.all().none()
2.13基于django的fbv和cbv都能实现遵循restful规范的接口
def user(request):
if request.metho == 'GET':
pass
class UserView(View):
def get()...
def post...
2.14基于django rest framework框架实现restful api的开发。
- 免除csrf认证
- 视图(APIView、ListAPIView、ListModelMinx)
- 版本
- 认证
- 权限
- 节流
- 解析器
- 筛选器
- 分页
- 序列化
- 渲染器
2.15简述drf中认证流程?
2.16简述drf中节流的实现原理以及过程?匿名用户/非匿名用户 如何实现频率限制?
2.17GenericAPIView视图类的作用?
他提供了一些规则,例如:
class GenericAPIView(APIView):
serializer_class = None
queryset = None
lookup_field = 'pk'
filter_backends = api_settings.DEFAULT_FILTER_BACKENDS
pagination_class = api_settings.DEFAULT_PAGINATION_CLASS
def get_queryset(self):
return self.queryset
def get_serializer_class(self):
return self.serializer_class
def filter_queryset(self, queryset):
for backend in list(self.filter_backends):
queryset = backend().filter_queryset(self.request, queryset, self)
return queryset
@property
def paginator(self):
if not hasattr(self, '_paginator'):
if self.pagination_class is None:
self._paginator = None
else:
self._paginator = self.pagination_class()
return self._paginator
他相当于提供了一些规则,建议子类中使用固定的方式获取数据,例如:
class ArticleView(GenericAPIView):
queryset = models.User.objects.all()
def get(self,request,*args,**kwargs):
query = self.get_queryset()
我们可以自己继承GenericAPIView来实现具体操作,但是一般不会,因为更加麻烦。
而GenericAPIView主要是提供给drf内部的 ListAPIView、Create....
class ListModelMixin:
def list(self, request, *args, **kwargs):
queryset = self.filter_queryset(self.get_queryset())
page = self.paginate_queryset(queryset)
if page is not None:
serializer = self.get_serializer(page, many=True)
return self.get_paginated_response(serializer.data)
serializer = self.get_serializer(queryset, many=True)
return Response(serializer.data)
class ListAPIView(mixins.ListModelMixin,GenericAPIView):
def get(self, request, *args, **kwargs):
return self.list(request, *args, **kwargs)
class MyView(ListAPIView):
queryset = xxxx
ser...
总结:GenericAPIView主要为drf内部帮助我们提供增删改查的类LIstAPIView、CreateAPIView、UpdateAPIView、提供了执行流程和功能,我们在使用drf内置类做CURD时,就可以通过自定义 静态字段(类变量)或重写方法(get_queryset、get_serializer_class)来进行更高级的定制。
2.18jwt以及其优势。
2.19序列化时many=True和many=False的区别?
2.20应用DRF中的功能进行项目开发
*****
解析器:request.query_parmas/request.data
视图
序列化
渲染器:Response
****
request对象封装
版本处理
分页处理
***
认证
权限
节流
基于APIView实现呼啦圈
继承ListAPIView+ GenericViewSet,ListModelMixin实现呼啦圈
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