Cannot run function when using Python 3.12

[humoflife]

What happened?

When making a new function from template, and using Python 3.12, the following error occurs:

hatch run development
Cannot run function: Task <Task pending name='Task-3' coro=<Server.stop() running at /Users/......./.venv-default/lib/python3.12/site-packages/grpc/aio/_server.py:150> cb=[_run_until_complete_cb() at /Users/......./miniconda3/lib/python3.12/asyncio/base_events.py:180]> got Future <Task pending name='Task-2' coro=<AioServer._server_main_loop()> cb=[AioServer._serving_task_crash_handler()]> attached to a different loop

How can we reproduce it?

• Install Python 3.12.
• Initialize function from template: crossplane beta xpkg init function-xbuckets https://github.com/crossplane/function-template-python -d function-xbuckets.
• Run hatch run development.

What environment did it happen in?

Function-template-python version: ba13247.

The issue was observed at 12:49pm PDT, Fri March 15.

[azkore]

Can confirm that it happens for me as well.
It seems to be related to the grpcio version. Changing it from 1.62.1 to 1.60.1 here as a workaround allowed me to use python 3.12.

[bobh66]

I think this is caused by the server being created before the loop:

https://github.com/crossplane/function-sdk-python/blob/main/crossplane/function/runtime.py#L85

and

https://github.com/crossplane/function-sdk-python/blob/main/crossplane/function/runtime.py#L107

If I move the loop creation before the server creation I don't see the crash. I'm guessing that the server creates it's own event loop which isn't noticed by the asyncio.get_event_loop() code so it creates a second one and we end up with two.

I'll push a PR to fix it.