Issue setting up AsyncServer - Multiple errors

[AKannanMSFT]

My server.py

import configparser
from dotenv import load_dotenv
from aiohttp import web
import socketio
from SomethingExec import SomethingExecNamespace

load_dotenv()

sio = socketio.AsyncServer(namespaces='*',async_mode='aiohttp')
app = web.Application()
sio.attach(app)

sio.register_namespace(SomethingExecNamespace('/api/killbill'))

if __name__ == '__main__':
    web.run_app(app)

SomethingExec.py

import socketio
import os

class SomethingExecNamespace(socketio.AsyncClientNamespace,socketio.Namespace):
    def on_connect(self, sid, environ):
        print('Connected')
        pass

    def on_disconnect(self, sid):
        print('Disconnected')
        pass

    async def on_killbill(self,sid, data):
        print('On Kill Bill Invoked {} {}'.format(sid,data))
        
        await self.emit('on_killedbill',data)

First without including both socketio.Namespace and socketio.AsyncClientNamespace, I get an error:

raise ValueError('Not a namespace instance')
ValueError: Not a namespace instance

After including both (deriving from both), upon invoking the killbill event from the client, I get the following error:

Task exception was never retrieved
future: <Task finished name='Task-18' coro=<AsyncServer._handle_event_internal() done, defined at \venv\lib\site-packages\socketio\asyncio_server.py:522> exception=AttributeError("'NoneType' object has no attribute 'emit'")>
Traceback (most recent call last):
  File "\venv\lib\site-packages\socketio\asyncio_server.py", line 524, in _handle_event_internal
    r = await server._trigger_event(data[0], namespace, sid, *data[1:])
  File "\venv\lib\site-packages\socketio\asyncio_server.py", line 569, in _trigger_event
    return await self.namespace_handlers[namespace].trigger_event(
  File "\venv\lib\site-packages\socketio\asyncio_namespace.py", line 178, in trigger_event
    ret = await handler(*args)
  File "\SomethingExec.py", line 21, in on_killbill
    await self.emit('on_killedbill',data)
  File "\venv\lib\site-packages\socketio\asyncio_namespace.py", line 194, in emit  
    return await self.client.emit(event, data=data,      
AttributeError: 'NoneType' object has no attribute 'emit'

[miguelgrinberg]

The error that you have is that you are using the AsyncClientNamespace, which is used with clients. The correct class to use in a server is AsyncNamespace.

[AKannanMSFT]

Thank you @miguelgrinberg, how silly that I didn't catch it.