If you look at the code more carefully, you'll see that I'm not merely
checking what's been imported. In each case I'm asking the relevant
framework if they're running an event loop *in the current thread*.
pe, 2018-08-17 kello 09:26 -0700, Brett Cannon kirjoitti:
> Importation does not equate to execution. I.e. since I could have
> multiple event loops running at once that means what's in sys.modules
> can't tell me what event loop I'm currently interacting with.
>
> On Fri, 17 Aug 2018 at 09:09 Alex Grönholm <alex.gronh...@nextday.fi>
> wrote:
> > This was my approach:
> >
> > def _detect_running_asynclib() -> str:
> > if 'trio' in sys.modules:
> > from trio.hazmat import current_trio_token
> > try:
> > current_trio_token()
> > except RuntimeError:
> > pass
> > else:
> > return 'trio'
> >
> > if 'curio' in sys.modules:
> > from curio.meta import curio_running
> > if curio_running():
> > return 'curio'
> >
> > if 'asyncio' in sys.modules:
> > from .backends.asyncio import get_running_loop
> > if get_running_loop() is not None:
> > return 'asyncio'
> >
> > raise LookupError('Cannot find any running async event loop')
> >
> > Is there something wrong with this?
> > to, 2018-08-16 kello 00:01 -0700, Nathaniel Smith kirjoitti:
> > > Hi all,
> > > A number of people are working on packages that support multiple
> > > asyncbackends (e.g., asyncio + trio, or trio + curio, or trio +
> > > twisted,...). So then the question arises... how can I figure out
> > > which asynclibrary my user is actually using?
> > > Answer: install sniffio, and then
> > > callsniffio.current_async_library(), and it tells you.
> > > Well, right now it only works for trio and asyncio, but if
> > > youmaintain an async library and you want to make it easier for
> > > packagesto detect you, then it's easy to add support – see the
> > > manual. Weconsidered various clever things, but ultimately
> > > decided that the bestapproach was to use a ContextVar and make it
> > > the coroutine runner'sresponsibility to advertise which async
> > > flavor it uses. In particular,this approach works even for hybrid
> > > programs that are using multiplecoroutine runners in the same
> > > loop, like a Twisted program withasyncio-flavored and twisted-
> > > flavored coroutines in the same thread,or a Trio program using
> > > trio-asyncio to run both asyncio-flavored andtrio-flavored
> > > coroutines in the same thread.
> > > Github: https://github.com/python-trio/sniffioManual:
> > > https://sniffio.readthedocs.io/PyPI: https://pypi.org/p/sniffio
> > > -n
> > >
> >
> > _______________________________________________
> >
> > Async-sig mailing list
> >
> > Async-sig@python.org
> >
> > https://mail.python.org/mailman/listinfo/async-sig
> >
> > Code of Conduct: https://www.python.org/psf/codeofconduct/
> >
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