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Python 3.12+ breaks backwards compatibility for logging QueueHandler with some Queue classes #119819

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stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error
@shmilee

Description

@shmilee

Bug report

Bug description:

Related bug:#111615
Related pull:#111638
Relatedcodes:

if'queue'inconfig:
frommultiprocessing.queuesimportQueueasMPQueue
qspec=config['queue']
ifnotisinstance(qspec, (queue.Queue,MPQueue)):
ifisinstance(qspec,str):
q=self.resolve(qspec)
ifnotcallable(q):
raiseTypeError('Invalid queue specifier %r'%qspec)
q=q()
elifisinstance(qspec,dict):
if'()'notinqspec:
raiseTypeError('Invalid queue specifier %r'%qspec)
q=self.configure_custom(dict(qspec))
else:
raiseTypeError('Invalid queue specifier %r'%qspec)
config['queue']=q

reproducible example using Python 3.12.3

importlogging.configdefmain(q):config= {'version':1,'handlers': {'sink': {'class':'logging.handlers.QueueHandler','queue':q,            },        },'root': {'handlers': ['sink'],        },    }logging.config.dictConfig(config)if__name__=='__main__':importmultiprocessingasmpmain(mp.Manager().Queue())#import asyncio#main(asyncio.Queue())  # broken too

error:

Traceback (most recent call last):  File "/usr/lib/python3.12/logging/config.py", line 581, in configure    handler = self.configure_handler(handlers[name])              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/usr/lib/python3.12/logging/config.py", line 801, in configure_handler    raise TypeError('Invalid queue specifier %r' % qspec)TypeError: Invalid queue specifier <AutoProxy[Queue] object, typeid 'Queue' at 0x7f8b07189d90>The above exception was the direct cause of the following exception:Traceback (most recent call last):  File "/home/xxx/logging-queue-handler-bug.py", line 33, in <module>    main(mp.Manager().Queue())  File "/home/xxx/logging-queue-handler-bug.py", line 29, in main    logging.config.dictConfig(config)  File "/usr/lib/python3.12/logging/config.py", line 914, in dictConfig    dictConfigClass(config).configure()  File "/usr/lib/python3.12/logging/config.py", line 588, in configure    raise ValueError('Unable to configure handler 'ValueError: Unable to configure handler 'sink'

Queue classes to check for logging QueueHandler

  • queue.Queue(),<queue.Queue at 0x7fb86eeef170>,works.
  • multiprocessing
    • multiprocessing.Queue(),<multiprocessing.queues.Queue at 0x7fb871790500>,works.
    • multiprocessing.Manager().Queue()<AutoProxy[Queue] object, typeid 'Queue' at 0x7fb86ef4a840>,broken.
      Its class ismultiprocessing.managers.AutoProxy[Queue], a subclass ofmultiprocessing.managers.BaseProxy.
  • asyncio.queues.Queue()<Queue at 0x7fb86f0be4e0 maxsize=0>,broken.
  • any other Queue?

discuss: how to fix

Check all Queue classes mentioned above in

ifnotisinstance(qspec, (queue.Queue,MPQueue)):

or just focus on handling special cases: str and dict, while leaving other cases un-checked (e.g., queue.Queue, multiprocessing.queues.Queue).

CPython versions tested on:

3.12

Operating systems tested on:

Linux

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    stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

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