uvicorn eats SIGINTs, does not propagate exceptions

The following snippet cannot be killed with a SIGINT (ctrl+c):

import asyncio

from starlette.applications import Starlette
from uvicorn import Config, Server

async def web_ui():
    await Server(Config(Starlette())).serve()

async def task():
    await asyncio.sleep(100000000000000)

async def main():
    await asyncio.gather(web_ui(), task())

if __name__ == "__main__":
    asyncio.run(main())

It appears that uvicorn is eating SIGINTs and does not propagate the KeyboardInterrupt and/or Cancelled exceptions. Thanks for having a look.

[maxfischer2781]

This has turned out to be a real problem for running an optional uvicorn based server inside an existing asyncio application. Since Server.serve finishes gracefully and the original signal handlers are never restored there is no way to ^C the application itself.

It looks okay’ish for Server.serve to capture signals for graceful shutdown, but it should at least restore the original signal handlers and ideally also reproduce the original behaviour as well. From the looks of it, Server.serve should raise KeyboardInterrupt when done and only Server.run should suppress it.

[fastily]

^ courtesy ping for @Kludex , who seems to be the most active maintainer