Provide event handlers with all the arguments they request

[drzraf]

Is your feature request related to a problem? Please describe.

Arguments set passed to handlers is very opinionated and overly restricted.
I can't access namespace, sid, event's name whenever I want.
It'd be easy to pass keyword arguments and let handlers do whatever they want with them.

def log(self, event, data):
  # Do something with {event} & {data}

# Made a loop to avoid cumbersome repetitions due to wrapping
# my handler... for the sole purpose of providing `evt`
# but it doesn't make the code clearer
for evt in ['foo', 'bar']:
    sio.on(evt, handler=lambda data: log(evt, data))
    

Describe the solution you'd like

def log(self, event, data, sid, namespace):
  # Do something with {*}
  # or maybe **kwarg and let me choose for it
  # or any solution that allows me to access *all* properties of this message

sio.on('foo', namespace='/', handler=log)
sio.on('bar', handler=log)

[miguelgrinberg]

Have you seen the catch-all event handlers in the documentation? If you create a catch-all namespace and event handler you'll get what you want, I think.

https://python-socketio.readthedocs.io/en/stable/client.html#catch-all-event-and-namespace-handlers

[drzraf]

I want to keep the catch-all for other purposes.

I'd prefer to run my functions for specific events and still retrieve all the context (sid/namespace/...).
(I also have a case where I needed the sid (to later disconnect) which isn't possible provided to named event handler)

[miguelgrinberg]

Sounds good. You can add any arguments you want on your handler functions using functools.partial. The sid is passed on to all event handlers in the server. In the client the sid is the same for all events. You can call the sio.get_sid() method to get it.