Flask-SocketIO 与 sid 和命名空间有关的问题

Question

Flask-SocketIO 给我带来了一些麻烦。我正在尝试使用以下代码初始化私人聊天室：

@socketio.on('join', namespace='/join')
def on_join(receiver_name):
    username = session['username']
    join_room(receiver_name)  # start a chat room with the receiver's username
    send(username + ' is now connected.', room=receiver_name)

不幸的是，我收到了诸如AttributeError: 'Request' object has no attribute 'sid' 之类的错误。即使我特别指定 request.sid 我也会收到错误消息。当我为join_room 中的sid 字段随机插入一些东西时，我得到一个命名空间错误。我已确保我正在导入所有必要的东西等。

这是具体的错误信息。

[2017-10-04 10:02:48,297] ERROR in app: Exception on /start_chat [POST]
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/agaidis/Desktop/challenge-backend-master/challenge-eng-base-master/backend-python/app.py", line 132, in start_chat
    on_join(friend_username)
  File "/Users/agaidis/Desktop/challenge-backend-master/challenge-eng-base-master/backend-python/app.py", line 152, in on_join
    join_room(receiver_name)  # start a chat room with the receiver's username
  File "/usr/local/lib/python3.6/site-packages/flask_socketio/__init__.py", line 756, in join_room
    sid = sid or flask.request.sid
  File "/usr/local/lib/python3.6/site-packages/werkzeug/local.py", line 347, in __getattr__
    return getattr(self._get_current_object(), name)
AttributeError: 'Request' object has no attribute 'sid'
127.0.0.1 - - [04/Oct/2017 10:02:48] "POST /start_chat HTTP/1.1" 500 -

Answer 1

您正在从 HTTP 路由自己调用 on_join() 函数。这不是应该如何工作的。当客户端在该事件上调用 emit() 时，将调用 Socket.IO 事件。 request.sid 变量仅存在于 Socket.IO 事件处理程序的上下文中，不会出现在 HTTP 处理程序中。

根据您的堆栈跟踪，我认为您需要将 start_chat 路由从 HTTP 更改为 Socket.IO。客户端需要通过emit() 调用而不是发送 HTTP 请求来请求加入聊天。