ResourceWarning: unclosed transport
Closed this issue · 2 comments
jwilk commented
Long story short
I'd like my software be warning-free.
Expected behaviour
Correct use of asyncio doesn't cause any warnings.
Actual behaviour
ResourceWarning: unclosed transport is emitted.
Steps to reproduce
Put this in test.py:
import asyncio
import aiohttp
async def main(url):
async with aiohttp.ClientSession() as session:
async with session.get(url) as response:
await response.read()
url = 'https://example.org/'
loop = asyncio.get_event_loop()
loop.run_until_complete(main(url))
loop.close()Then run:
$ python3 -Wd test.py
/usr/lib/python3.5/asyncio/selector_events.py:582: ResourceWarning: unclosed transport <_SelectorSocketTransport fd=7>
warnings.warn("unclosed transport %r" % self, ResourceWarning)Your environment
aiohttp from git master (d8848dd), Python 3.5.2, Linux.
asvetlov commented
The issue cannot be solved, sorry.
The reason is: after calling transport.close() asyncio needs for extra loop iteration for actual closing.
It's by design.
So if you add await asyncio.sleep(0) just before loop closing -- warning disappears.
If you want -- please feel free to add a note section to aiohttp documentation for stressing the behavior.
Perhaps it should be somewhere at very end of http://aiohttp.readthedocs.io/en/stable/client.html