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58 lines
1.7 KiB
58 lines
1.7 KiB
import asyncio
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import tornado
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from nbclient.util import run_sync
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@run_sync
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async def some_async_function():
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await asyncio.sleep(0.01)
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return 42
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def test_nested_asyncio_with_existing_ioloop():
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ioloop = asyncio.new_event_loop()
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try:
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asyncio.set_event_loop(ioloop)
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assert some_async_function() == 42
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assert asyncio.get_event_loop() is ioloop
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finally:
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asyncio._set_running_loop(None) # it seems nest_asyncio doesn't reset this
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def test_nested_asyncio_with_no_ioloop():
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asyncio.set_event_loop(None)
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try:
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assert some_async_function() == 42
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finally:
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asyncio._set_running_loop(None) # it seems nest_asyncio doesn't reset this
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def test_nested_asyncio_with_tornado():
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# This tests if tornado accepts the pure-Python Futures, see
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# https://github.com/tornadoweb/tornado/issues/2753
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# https://github.com/erdewit/nest_asyncio/issues/23
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asyncio.set_event_loop(asyncio.new_event_loop())
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ioloop = tornado.ioloop.IOLoop.current()
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async def some_async_function():
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future = asyncio.ensure_future(asyncio.sleep(0.1))
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# this future is a different future after nested-asyncio has patched
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# the asyncio module, check if tornado likes it:
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ioloop.add_future(future, lambda f: f.result())
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await future
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return 42
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def some_sync_function():
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return run_sync(some_async_function)()
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async def run():
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# calling some_async_function directly should work
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assert await some_async_function() == 42
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# but via a sync function (using nested-asyncio) can lead to issues:
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# https://github.com/tornadoweb/tornado/issues/2753
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assert some_sync_function() == 42
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ioloop.run_sync(run)
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