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Prevent file descriptor leak in util.just_run #237

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Prevent file descriptor leak in util.just_run #237

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9a877a1
Add a test ensuring that just_run doesn't leak fds
mariokostelac Jun 28, 2022
818f2a7
Make sure just_run doesn't leak file descriptors of new loops.
mariokostelac Jun 28, 2022
47283dc
Update nbclient/tests/test_util.py
mario-at-intercom Jun 29, 2022
fbf02e9
Call sleep without helper function
mariokostelac Jun 29, 2022
11fea9b
Rewrite test to avoid mypy issues
mariokostelac Jun 29, 2022
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37 changes: 36 additions & 1 deletion nbclient/tests/test_util.py
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Original file line number Diff line number Diff line change
@@ -1,10 +1,12 @@
import asyncio
import unittest.mock
from unittest.mock import MagicMock

import psutil
import pytest
import tornado

from nbclient.util import run_hook, run_sync
from nbclient.util import just_run, run_hook, run_sync


@run_sync
Expand Down Expand Up @@ -75,3 +77,36 @@ async def test_run_hook_async():
hook = MagicMock(return_value=some_async_function())
await run_hook(hook)
assert hook.call_count == 1


def test_just_run_doesnt_leak_fds():
proc = psutil.Process()

async def async_sleep():
await asyncio.sleep(0.01)

# Warmup, just to make sure we're not failing on some initial fds being opened for the first time.
for _ in range(10):
just_run(async_sleep())
fds_count = proc.num_fds()

diff = []
for _ in range(10):
just_run(async_sleep())
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diff.append(proc.num_fds() - fds_count)
assert diff == [0] * 10


def test_just_run_clears_new_loop():
async def async_sleep():
await asyncio.sleep(0.1)

loop = asyncio.new_event_loop()
loop.stop = MagicMock(wraps=loop.stop)
loop.close = MagicMock(wraps=loop.close)
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Let's just ignore type checks on these.

Suggested change
loop.stop = MagicMock(wraps=loop.stop)
loop.close = MagicMock(wraps=loop.close)
loop.stop = MagicMock(wraps=loop.stop) # type: ignore
loop.close = MagicMock(wraps=loop.close) # type: ignore

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I think I might have a better solution for these, without ignoring type checks.

I can't run tests locally, though.

(venv) dev-envs-ad\mario@a-2zurb4h4bbny ➜  nbclient git:(mario/fix_fd_leak) ls
binder  CHANGELOG.md  CONTRIBUTING.md  docs  LICENSE  MANIFEST.in  nbclient  nbclient.egg-info  pyproject.toml  pytest.ini  README.md  RELEASING.md  requirements-dev.txt  requirements.txt  setup.cfg  setup.py  venv
(venv) dev-envs-ad\mario@a-2zurb4h4bbny ➜  nbclient git:(mario/fix_fd_leak) tox -e py38
ERROR: tox config file (either pyproject.toml, tox.ini, setup.cfg) not found

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We're not using tox, you should just run pytest.

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Ah I see, I was running pytest, but it was missing the type checking piece that failed. I think https://github.com/jupyter/nbclient/blob/main/CONTRIBUTING.md might need an update.

Re: type checking. Would it make sense to put it as pre-commit check?

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Ah I see, I was running pytest, but it was missing the type checking piece that failed. I think https://github.com/jupyter/nbclient/blob/main/CONTRIBUTING.md might need an update.

Indeed!

Re: type checking. Would it make sense to put it as pre-commit check?

Definitely, if you want to open a PR for that, it would be great.


with unittest.mock.patch.object(asyncio, "new_event_loop", return_value=loop):
just_run(async_sleep())

loop.stop.assert_called_once
loop.close.assert_called_once
6 changes: 5 additions & 1 deletion nbclient/util.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,11 @@ def just_run(coro: Awaitable) -> Any:

nest_asyncio.apply()
check_patch_tornado()
return loop.run_until_complete(coro)
res = loop.run_until_complete(coro)
if not had_running_loop:
loop.stop()
loop.close()
return res


T = TypeVar("T")
Expand Down
1 change: 1 addition & 0 deletions requirements-dev.txt
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Expand Up @@ -7,6 +7,7 @@ ipywidgets<8.0.0
mypy
pip>=18.1
pre-commit
psutil
pytest>=4.1
pytest-asyncio
pytest-cov>=2.6.1
Expand Down