Async client ignores ctrl-c after connect fails

[JoriDubrovin]

My code tries to connect with socketio.AsyncClient, and if that fails, sleeps a few seconds before trying again. With python-engineio 3.13.2, if the user presses ctrl-c during the sleep, the program does not stop but just prints ^C.

Like #196, this seems to be related to the call to add_signal_handler.

This is my script.py:

import asyncio
import socketio

async def try_connect():
    sio = socketio.AsyncClient()
    try:
        await sio.connect(url='file:///')
    except Exception as e:
        print(e)
    await asyncio.sleep(4)

asyncio.get_event_loop().run_until_complete(try_connect())

To reproduce with Python 3.7.3 on Debian buster:

> python3 -m venv no-ctrl-c
> source no-ctrl-c/bin/activate
> pip install python-engineio==3.13.2 python-socketio==4.6.0 aiohttp==3.6.2
> python script.py
Connection refused by the server
^C^C^C^C^C

If I replace python-engineio==3.13.2 with the previous version 3.13.1, then ctrl-c stops the program with a KeyboardInterrupt, as expected.

[miguelgrinberg]

Thanks. I have it in my list to review the signal handling changes so I'll have an update on this soon.