def分页器，频率限制

分页器

#views.py

# 查所有，才需要分页
from rest_framework.generics import ListAPIView
# 内置三种分页方式
from  rest_framework.pagination import PageNumberPagination,LimitOffsetPagination,CursorPagination
'''
PageNumberPagination
    page_size:每页显示的条数
'''
class MyPageNumberPagination(PageNumberPagination):
    #http://127.0.0.1:8000/api/books2/?aaa=1&size=6
    page_size=3  #每页条数
    page_query_param='aaa' #查询第几页的key
    page_size_query_param='size' # 每一页显示的条数
    max_page_size=5    # 每页最大显示条数


# class MyLimitOffsetPagination(LimitOffsetPagination):
#     default_limit = 3   # 每页条数
#     limit_query_param = 'limit' # 往后拿几条
#     offset_query_param = 'offset' # 标杆
#     max_limit = 5   # 每页最大几条

class MyCursorPagination(CursorPagination):
    cursor_query_param = 'cursor'  # 每一页查询的key
    page_size = 2   #每页显示的条数
    ordering = '-id'  #排序字段
# class BookView(ListAPIView):
#     # queryset = models.Book.objects.all().filter(is_delete=False)
#     queryset = models.Book.objects.all()
#     serializer_class = BookModelSerializer
#     #配置分页
#     pagination_class = MyCursorPagination

# 如果使用APIView分页
from utils.throttling import MyThrottle
class BookView(APIView):
    # throttle_classes = [MyThrottle,]
    def get(self,request,*args,**kwargs):
        book_list=models.Book.objects.all()
        # 实例化得到一个分页器对象
        page_cursor=MyPageNumberPagination()

        book_list=page_cursor.paginate_queryset(book_list,request,view=self)
        next_url =page_cursor.get_next_link()
        pr_url=page_cursor.get_previous_link()
        # print(next_url)
        # print(pr_url)
        book_ser=BookModelSerializer(book_list,many=True)
        return Response(data=book_ser.data)

    
  

#settings.py
REST_FRAMEWORK={
    'PAGE_SIZE': 2,
}

2 根据ip进行频率限制

# 写一个类，继承SimpleRateThrottle，只需要重写get_cache_key 
from rest_framework.throttling import ScopedRateThrottle,SimpleRateThrottle

#继承SimpleRateThrottle
class MyThrottle(SimpleRateThrottle):
    scope='luffy'
    def get_cache_key(self, request, view):
        print(request.META.get('REMOTE_ADDR'))
        return request.META.get('REMOTE_ADDR')   # 返回
    
# 局部使用，全局使用 
REST_FRAMEWORK={
    'DEFAULT_THROTTLE_CLASSES': (
        'utils.throttling.MyThrottle',
    ),
    'DEFAULT_THROTTLE_RATES': {
        'luffy': '3/m'  # key要跟类中的scop对应
    },
}

# python3 manage.py runserver 0.0.0.0:8000   你们局域网就可以相互访问


# 内网穿透