How use request.sid

[t-h2o]

Hi! does request.sid work?

My entire project and the version I had the problem is available here

example use request.sid

from:

Flask-SocketIO/example/app.py

Line 122 in e728965

print('Client disconnected', request.sid)

Work -> not work

work

The client receive a SID :)

{"sid":"fNHMvLB-E6xLWKWdAAAB"}

patch applied

-from flask import Flask
+from flask import Flask, request
 from flask_socketio import SocketIO, disconnect
 from flask_cors import CORS
 from os import environ
@@ -75,7 +75,7 @@ def create_app():

     @socketio.on("connect")
     def handle_connect():
-        sid = socketio.server.eio.sid
+        sid = request.sid
         user_id = verify_token(sid)

         if not user_id:
@@ -89,7 +89,7 @@ def create_app():

     @socketio.on("disconnect")
     def handle_disconnect():
-        sid = socketio.server.eio.sid
+        sid = request.sid
         if sid in connected_users:
             user_id = connected_users.pop(sid)
             print(f"Client disconnected with ID: {sid}, User ID: {user_id}")
@@ -102,7 +102,7 @@ def create_app():
     @socketio.on("message")
     def handle_message(data):
         try:
-            sid = socketio.server.eio.sid
+            sid = request.sid
             user_id = connected_users.get(sid)
             if not user_id:
                 print(f"No authenticated user found for message from {sid}")

NOT work

The client is rejected by the server :(

{"message":"Connection rejected by server"}

Where in documentation

I searched in the documentation about request.sid but I didn't find anything.

flask-socketio: search "request.sid"

Werkzeug: assert status_set

It seems normal in development mode from this comment miguelgrinberg/flask-sock#27 (comment)

Error on request:
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/werkzeug/serving.py", line 370, in run_wsgi
    execute(self.server.app)
  File "/usr/local/lib/python3.9/site-packages/werkzeug/serving.py", line 336, in execute
    write(b"")
  File "/usr/local/lib/python3.9/site-packages/werkzeug/serving.py", line 261, in write
    assert status_set is not None, "write() before start_response"
AssertionError: write() before start_response

[miguelgrinberg]

You have to explain better what you are doing. Flask-SocketIO is a server, but your non-working error appears to indicate you are doing things in the client that fail.

As far as documentation, searching for sid should lead you to https://flask-socketio.readthedocs.io/en/latest/implementation_notes.html.

The correct way to get the sid is with request.sid. The other expression that you have is not what you want as it uses private parts of this package that are not exposed to applications.

[t-h2o]

Thanks.

You have to explain better what you are doing.

My goal is to implement socketIO in my Flask project.
I opened this discussion because after applying, the server behavior has changed.

your non-working error appears to indicate you are doing things in the client that fail.

Yes, non-working error are in the client, I use it to test the server.

• working: after the login I receive a SID.
• non-working: after the login, I receive this error "Connection rejected by server".

The other expression that you have is not what you want as it uses private parts of this package that are not exposed to applications.

Now I understand why I couldn't find anything about SocketIO.server in API Reference.

I call in my program SocketIO.server. How can I get the environ without using SocketIO.server it it is private?

# Get environment for this connection
environ = socketio.server.environ.get(sid, {})

# Check auth data
auth = environ.get("socketio", {}).get("auth", {})

[miguelgrinberg]

Anything that is not in the documentation is private and should not be used. If you use these things then your application may break when you upgrade to a newer version, because I cannot guarantee that private elements will never change.

I still don't understand what you are trying to do, but I think you are using the sid for things that you shouldn't. The sid is just a unique code that identifies a session. For a given client, there is a sid for the low-level transport, and a sid for each connected namespace. These are all different, and it is likely that you are mixing them up.

Also note that flask provides access to the environ for your client with request.environ.