Flask socketio (using gevent): are room messages emitted in order ?

[cty512]

Hi there,

Good day.
I have a quick query:

we have Flask-Socketio (using gevent) as server forwarding room message like below:

simplified from example app_namespace.py:

    def on_my_room_event(self, message): 
        emit('my_response', {'data': message['data']}, room=message['room'])

if
client send '1' to room1
client send '2' to room1

will room message be emitted by server in order ?
or in extreme case, will gevent schedule on_my_room_event() to emit message '2' prior to '1' ?

[miguelgrinberg]

This depends on implementation details of the gevent scheduler, it is not a question that I can answer. If you want the messages from a client to be processed in strict order, pass async_handler=False when you create your server, and then the server will invoke handlers for each client back to back instead of in parallel.

[cty512]

Thank you so much for your advice.