问Django通道-自定义身份验证中间件引发：“coroutine”对象不可调用

EN

from rest_framework.authtoken.models import Token
from django.contrib.auth.models import AnonymousUser
from django.db import close_old_connections
from asgiref.sync import sync_to_async


class TokenAuthMiddleware:
    """
    Token authorization middleware for Django Channels 2
    """

    def __init__(self, inner):
        self.inner = inner

    def __call__(self, scope):
        # Close old database connections to prevent usage of timed out connections
        sync_to_async(close_old_connections)()

        headers = dict(scope['headers'])
        try:
            token_name, token_key = headers[b'sec-websocket-protocol'].decode().split(', ')
            
            if token_name == 'Token':
                token = sync_to_async(Token.objects.get, thread_sensitive=True)(key=token_name)

                scope['user'] = token.user
            
            else:
                scope['user'] = AnonymousUser()

        except Token.DoesNotExist:
            scope['user'] = AnonymousUser()

        return self.inner(scope)

token = await sync_to_async(Token.objects.get, thread_sensitive=True)(key=token_name)

[Failure instance: Traceback: <class 'TypeError'>: 'coroutine' object is not callable