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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