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monkey.patch_socket(aggressive=True) no longer removes select.epoll (1.5 regression) #1570

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navytux opened this issue Apr 16, 2020 · 6 comments · Fixed by #1571
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@navytux
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navytux commented Apr 16, 2020

  • gevent version: gevent-1.5.0-cp37-cp37m-manylinux2010_x86_64.whl
  • Python version: CPython 3.7.3 (default, Dec 20 2019, 18:57:59) provided by Debian10
  • Operating System: Debian GNU/Linux 10, Linux deco 4.19.0-8-amd64 #1 SMP Debian 4.19.98-1 (2020-01-26) x86_64 GNU/Linux

Description:

monkey.patch_socket(aggressive=True) documents that it removes things like select.epoll on Py3. It used to be indeed so with gevent-1.4, but is no longer the case with gevent-1.5:

(3g14.venv) kirr@deco:~/tmp/trashme/r$ python
Python 3.7.3 (default, Dec 20 2019, 18:57:59) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import gevent
>>> gevent.version_info
version_info(major=1, minor=4, micro=0, releaselevel='dev', serial=0)
>>> from gevent.monkey import patch_select
>>> patch_select(aggressive=True)
>>> import select
>>> select.epoll
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'select' has no attribute 'epoll'       #  <-- NOTE removed
(3.venv) kirr@deco:~/tmp/trashme/r$ python
Python 3.7.3 (default, Dec 20 2019, 18:57:59) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import gevent
>>> gevent.version_info
version_info(major=1, minor=5, micro=0, releaselevel='dev', serial=0)
>>> from gevent.monkey import patch_select
>>> patch_select(aggressive=True)
>>> import select
>>> select.epoll
<class 'select.epoll'>                                         # <-- NOTE not removed

gevent/select.py says:

    if aggressive:
        # since these are blocking we're removing them here. This makes some other
        # modules (e.g. asyncore)  non-blocking, as they use select that we provide
        # when none of these are available.
        patch_request.remove_item(
            'epoll'
            'kqueue',
            'kevent',
            'devpoll',
        )

so judging by this comment, since select.epoll is no longer removed, something might have become broken with e.g. asyncore.

The issue was found via gpython test.

jamadden added a commit that referenced this issue Apr 16, 2020
A missing comma led to string concatenation and a silent bug. I'm surprised this wasn't really tested anywhere.

Fixes #1570
@navytux
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navytux commented Apr 16, 2020

@jamadden thanks for quick fix.

@jamadden
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This was also a problem for kqueue/kevent:

Traceback (most recent call last):
 File "//2.7/lib/python2.7/threading.py", line 801, in __bootstrap_inner
   self.run()
 File "//2.7/lib/python2.7/threading.py", line 754, in run
   self.__target(*self.__args, **self.__kwargs)
 File "///eggs/ZEO-5.2.1-py2.7.egg/ZEO/asyncio/client.py", line 858, in run
   loop = new_event_loop()
 File "///eggs/trollius-2.2-py2.7.egg/trollius/events.py", line 615, in new_event_loop
   return get_event_loop_policy().new_event_loop()
 File "///eggs/trollius-2.2-py2.7.egg/trollius/events.py", line 566, in new_event_loop
   return self._loop_factory()
 File "///eggs/trollius-2.2-py2.7.egg/trollius/unix_events.py", line 56, in __init__
   super(_UnixSelectorEventLoop, self).__init__(selector)
 File "///eggs/trollius-2.2-py2.7.egg/trollius/selector_events.py", line 75, in __init__
   self._make_self_pipe()
 File "///eggs/trollius-2.2-py2.7.egg/trollius/selector_events.py", line 140, in _make_self_pipe
   self.add_reader(self._ssock.fileno(), self._read_from_self)
 File "///eggs/trollius-2.2-py2.7.egg/trollius/selector_events.py", line 257, in add_reader
   (handle, None))
 File "///eggs/trollius-2.2-py2.7.egg/trollius/selectors.py", line 530, in register
   kev = select.kevent(key.fd, select.KQ_FILTER_READ,
AttributeError: 'module' object has no attribute 'kevent'

@navytux
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navytux commented Apr 22, 2020

@jamadden, thanks for heads up. Given that this regression is showing in many places, in my view it makes sense to make a 1.5.post1 gevent release with the fix.

@navytux
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navytux commented Apr 22, 2020

Sorry, I was too fast to type - you've already made it. Thanks!

@jamadden
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post releases are reserved for packaging fixes that don't affect the code. The next bugfix release, using the new CalVer scheme, is now out (though I haven't finished updating all the docs).

@navytux
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navytux commented Apr 22, 2020

I see; thanks for clarifying.

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