Python: How to add signal handler to asyncio HTTP server

Question

My HTTP runs using aiohttp.web module:

import asyncio     as aio
import aiohttp.web as web

server = web.Application()
server.add_routes([...])

web.run_app(server, port=8080)

The code inside web.run_app use the main event loop, it handles KeyboardInterrupt exception and exit when Ctrl+C is pressed, in simple apps. However, I need to terminate all threads, which aiohttp.web won't, and the programme doesn't exit.

How to override the default signal handler of aiohttp.web.Application?

Answer 1

Thanks to @user4815162342 in the comments, 2 solutions for the problem:

Solution 1: Add daemon=True:

my_thread = Thread(target=..., daemon=True)

Solution 2: Wrap web.run_app in a try block:

try:
    web.run_app(server,...)
finally:
    terminate_threads()