Hi all
My app runs an HTTP server using asyncio. A lot of the code dates back
to Python 3.4, and I am trying to bring it up to date. There is one
aspect I do not understand.
The 'old' way looks like this -
import asyncio
def main():
loop = asyncio.get_event_loop()
server = loop.run_until_complete(
asyncio.start_server(handle_client, host, port))
loop.run_forever()
if __name__ == '__main__':
main()
According to the docs, the preferred way is now like this -
import asyncio
async def main():
loop = asyncio.get_running_loop()
server = await asyncio.start_server(
handle_client, host, port)
async with server:
server.serve_forever()
if __name__ == '__main__':
asyncio.run(main())
It works, and it does look neater. But I want to start some background
tasks before starting the server, and cancel them on Ctrl+C.
Using the 'old' method, I can wrap 'loop.run_forever()' in a
try/except/finally, check for KeyboardInterrupt, and run my cleanup in
the 'finally' block.
Using the 'new' method, KeyboardInterrupt is not caught by
'server.serve_forever()' but by 'asyncio.run()'. It is too late to do
any cleanup at this point, as the loop has already been stopped.
Is it ok to stick to the 'old' method, or is there a better way to do this.
Thanks
Frank Millman
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