[PROTON-2776] Exception in IOHandler.on_selectable_expired/update after wakeup from sleep

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: python-binding
• Labels: pull-request-available
• Environment: Fedora GNU/Linux, python binding 0.38.0
• Assignee: Unassigned
• Reporter: Ievgen Popovych
• Created: 20/Nov/23 10:04
• Updated: 20/Nov/23 10:06

Description

This occasionally happens after my laptop wakes up from overnight sleep.

IOHandler.on_selectable_expired() is invoked with selectable that has
_terminated=True and _transport=None so when IOHandler.update()
is called it crashes when trying to handle the exception
(since transport is None):

Traceback (most recent call last):
File "/path/.venv/lib/python3.7/site-packages/proton/_handlers.py", line 1293, in update
capacity = transport.capacity()
AttributeError: 'NoneType' object has no attribute 'capacity'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/path/my-project.py", line 285, in run
self.container.run()
File "/path/.venv/lib/python3.7/site-packages/proton/_reactor.py", line 197, in run
while self.process():
File "/path/.venv/lib/python3.7/site-packages/proton/_reactor.py", line 262, in process
event.dispatch(self._global_handler)
File "/path/.venv/lib/python3.7/site-packages/proton/_events.py", line 158, in dispatch
_dispatch(handler, type.method, self)
File "/path/.venv/lib/python3.7/site-packages/proton/_events.py", line 131, in _dispatch
handler.on_unhandled(method, *args)
File "/path/.venv/lib/python3.7/site-packages/proton/_reactor.py", line 905, in on_unhandled
event.dispatch(self.base)
File "/path/.venv/lib/python3.7/site-packages/proton/_events.py", line 158, in dispatch
_dispatch(handler, type.method, self)
File "/path/.venv/lib/python3.7/site-packages/proton/_events.py", line 129, in _dispatch
m(*args)
File "/path/.venv/lib/python3.7/site-packages/proton/_handlers.py", line 1237, in on_selectable_expired
self.update(t, s, r.now)
File "/path/.venv/lib/python3.7/site-packages/proton/_handlers.py", line 1296, in update
if transport.closed:
AttributeError: 'NoneType' object has no attribute 'closed'

I have proposed a fix at https://github.com/apache/qpid-proton/pull/364.