在使用DRF和django revproxy时获得“异常:读取请求的数据流后无法访问body”

django-revproxy 和 Django REST Framework 在我的项目中。我公开了一个API,用户可以从中获得有关聊天机器人的分析信息,其工作原理如下:

• 用户从Django项目发送分析请求
• if True 它联系另一个外部服务。

我的 :

# urls.py
urlpatterns = (
    url(r'^analytics/(?P<path>.*)$', api.AnalyticsFunctionsProxyView.as_view()),
)

在我看来:

# views.py
from rest_framework.authentication import TokenAuthentication
from rest_framework_jwt.authentication import JSONWebTokenAuthentication
from rest_framework.permissions import IsAuthenticated
from revproxy.views import ProxyView
from .permissions import HasChatBotPermission

...

class AnalyticsFunctionsProxyView(ProxyView):
    upstream = settings.ANALYTICS_FAAS_URL

    def parse_body(self, request):
        if isinstance(request, rest_framework.request.Request):
            return request.data
        return super(AnalyticsFunctionsProxyView, self).parse_body(request)

    @classmethod
    def as_view(cls, *args, **kwargs):
        view = super(AnalyticsFunctionsProxyView, cls).as_view(*args, **kwargs)
        view = permission_classes((IsAuthenticated, HasChatBotPermission,))(view)
        view = authentication_classes([TokenAuthentication, JSONWebTokenAuthentication])(view)
        view = api_view(['GET', 'POST'])(view)


 return view

HasChatBotPermission 权限

#permissions.py
class HasChatBotPermission(permissions.BasePermission):
    def has_permission(self, request, view):
        try:
            bot_name = request.data.get('name')
            user = request.user
            self.message = 'Permission denied for {}'.format(name)
            return ChatBot.objects.filter(user=user, project_name=project_id).exists()
        except Exception:
            self.message = 'Permission denied, no project_id was defined!'
            return False

调用视图时会引发此异常:

Traceback (most recent call last):
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/rest_framework/request.py", line 379, in __getattribute__
    return super(Request, self).__getattribute__(attr)
AttributeError: 'Request' object has no attribute 'body'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/django/core/handlers/exception.py", line 42, in inner
    response = get_response(request)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/fcmam5/anaconda3/lib/python3.6/contextlib.py", line 52, in inner
    return func(*args, **kwds)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/rest_framework/views.py", line 477, in dispatch
    response = self.handle_exception(exc)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/rest_framework/views.py", line 437, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/rest_framework/views.py", line 474, in dispatch
    response = handler(request, *args, **kwargs)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/rest_framework/decorators.py", line 52, in handler
    return func(*args, **kwargs)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/revproxy/views.py", line 204, in dispatch
    proxy_response = self._created_proxy_response(request, path)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/revproxy/views.py", line 139, in _created_proxy_response
    request_payload = request.body
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/rest_framework/request.py", line 383, in __getattribute__
    return getattr(self._request, attr)
  File "/home/fcmam5/dela3a/env/lib/python3.6/site-packages/django/http/request.py", line 264, in body
    raise RawPostDataException("You cannot access body after reading from request's data stream")
django.http.request.RawPostDataException: You cannot access body after reading from request's data stream

问题是由这条线引起的 bot_name = request.data.get('name') 在我的 permissions.py ,当我直接传递字符串时,它会毫无问题地传递。

我的问题是:

• 如何访问请求主体而不发生此错误?为什么我会犯这个错误?
• 使用Django revproxy检查用户权限是否有更好的解决方案。

这是我在Stackoverflow的第一个问题,如果我的问题不清楚,我很抱歉,而且我的英语很差:)