Starlette DeprecationWarning: run_until_first_complete is deprecated and will be removed in a future version.

[florimondmanca]

We get a warning when running tests:

tests/test_example.py::test_example
  /Users/florimond/Developer/florimondmanca-projects/arel/venv/lib/python3.11/site-packages/starlette/concurrency.py:19: DeprecationWarning: run_until_first_complete is deprecated and will be removed in a future version.
    warnings.warn(

As per encode/starlette#1443, the alternative seems to be to use anyio:

async def run_until_first_complete(*args: typing.Tuple[typing.Callable, dict]) -> None:
    async def run(handler, kwargs):
        await handler(**kwargs)
        tg.cancel_scope.cancel()

    async with anyio.create_task_group() as tg:
        for handler, kwargs in args:
            tg.start_soon(run, handler, kwargs)

We only support asyncio for now (see usage of asyncio.Event()). So as a first step, we could resolve the warning by bringing back what Starlette was doing before anyio...

async def run_until_first_complete(*args: typing.Tuple[typing.Callable, dict]) -> None:
    tasks = [create_task(handler(**kwargs)) for handler, kwargs in args]
    (done, pending) = await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
    [task.cancel() for task in pending]
    [task.result() for task in done]