Django 通道自定义身份验证中间件 __call__() 缺少 2 个必需的位置参数：“接收”和“发送”

Question

我正在为 Django 频道编写自定义身份验证中间件

class TokenAuthMiddleware:
    def __init__(self, inner):
        # Store the ASGI application we were passed
        self.inner = inner

    def __call__(self, scope):

        return TokenAuthMiddlewareInstance(scope, self)


class TokenAuthMiddlewareInstance:

    def __init__(self, scope, middleware):
        self.middleware = middleware
        self.scope = dict(scope)
        self.inner = self.middleware.inner

    async def __call__(self, receive, send):
        ## my logic to get validate user and store the user in user data
        ...
        ...
        ...
        self.scope['user'] = user_data
        inner = self.inner(self.scope)
        return await inner(receive, send)

但是在尝试从前端连接到 Web 套接字时，我收到以下错误

TypeError: __call__() missing 2 required positional arguments: 'receive' and 'send'

Answer 1

供您参考：https : //channels.readthedocs.io/en/stable/releases/3.0.0.html

从routing.py改变

websocket_urlpatterns = [
    re_path(r'ws/chat/(?P<room_name>\w+)/$', consumers.ChatConsumer),
]

to Consumers 现在有一个 as_asgi() 类方法，您需要在设置路由时调用：

websocket_urlpatterns = [
    re_path(r'ws/chat/(?P<room_name>\w+)/$', consumers.ChatConsumer.as_asgi()),
]

那么如果您需要自定义身份验证https://channels.readthedocs.io/en/stable/topics/authentication.html#custom-authentication

from channels.auth import AuthMiddlewareStack
from channels.db import database_sync_to_async
from django.contrib.auth import get_user_model

User = get_user_model()

@database_sync_to_async
def get_user(user_id):
    try:
        return User.objects.get(id=user_id)
    except User.DoesNotExist:
        return AnonymousUser()
        
class QueryAuthMiddleware:
    """
    Custom middleware (insecure) that takes user IDs from the query string.
    """
        
    def __init__(self, app):
        # Store the ASGI application we were passed
        self.app = app
        
    async def __call__(self, scope, receive, send):
        # Look up user from query string (you should also do things like
        # checking if it is a valid user ID, or if scope["user"] is already
        # populated).
        scope['user'] = await get_user(int(scope["query_string"]))
        
        return await self.app(scope, receive, send)
TokenAuthMiddlewareStack = lambda inner: QueryAuthMiddleware(AuthMiddlewareStack(inner))   

使用requirements.txt如下列表，并按此顺序下载包

Django==3.0.8
djangorestframework==3.11.0
websocket-client==0.57.0
redis==3.5.3
asgiref==3.2.10
channels-redis==2.4.2
channels==3.0.1