logging.config.ConvertingDict issue with MemoryHandler

[plemarre]

BPO	17508
Nosy	@vsajip
Files	bug-logging.py: Python script raising the error

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/vsajip'
closed_at = <Date 2013-03-22.15:28:18.925>
created_at = <Date 2013-03-21.12:34:27.907>
labels = ['type-bug', 'library']
title = 'logging.config.ConvertingDict issue with MemoryHandler'
updated_at = <Date 2013-03-23.11:01:52.047>
user = 'https://bugs.python.org/plemarre'

bugs.python.org fields:

activity = <Date 2013-03-23.11:01:52.047>
actor = 'python-dev'
assignee = 'vinay.sajip'
closed = True
closed_date = <Date 2013-03-22.15:28:18.925>
closer = 'python-dev'
components = ['Library (Lib)']
creation = <Date 2013-03-21.12:34:27.907>
creator = 'plemarre'
dependencies = []
files = ['29527']
hgrepos = []
issue_num = 17508
keywords = []
message_count = 5.0
messages = ['184866', '184930', '184948', '184974', '185037']
nosy_count = 3.0
nosy_names = ['vinay.sajip', 'python-dev', 'plemarre']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue17508'
versions = ['Python 3.2', 'Python 3.3']

[plemarre]

Hi, I use Python 3.2.3 and Python 3.3.0 on Windows 7 64 bits.
I have an issue with the short script enclosed.
I use the module logging to get a log file with logging.FileHandler. There were some issues about the file access on Windows, so I added a buffer with logging.handlers.MemoryHandler. I configure the logging using logging.config.dictConfig.
The issue appears when it comes to flush the MemoryHandler, either by reaching the capacity or by calling logging.shutdown(). Please find hereinbelow the traceback:

Traceback (most recent call last):
  File "C:\temp\bug-logging.py", line 38, in <module>
    logger.info(n)
  File "C:\Python32\lib\logging\__init__.py", line 1232, in info
    self._log(INFO, msg, args, **kwargs)
  File "C:\Python32\lib\logging\__init__.py", line 1364, in _log
    self.handle(record)
  File "C:\Python32\lib\logging\__init__.py", line 1374, in handle
    self.callHandlers(record)
  File "C:\Python32\lib\logging\__init__.py", line 1436, in callHandlers
    hdlr.handle(record)
  File "C:\Python32\lib\logging\__init__.py", line 835, in handle
    self.emit(record)
  File "C:\Python32\lib\logging\handlers.py", line 1090, in emit
    self.flush()
  File "C:\Python32\lib\logging\handlers.py", line 1150, in flush
    self.target.handle(record)
AttributeError: 'ConvertingDict' object has no attribute 'handle'

[vsajip]

Yes, this fails because it tries to construct the MemoryHandler first. Because the constructing is done in order of the keys, you can get it to work by renaming the 'fileGlobal' to 'afileGlobal' - this gets constructed before 'bufferGlobal'. I agree this is a workaround for now - I will implement a fix in due course.

[plemarre]

Thank you for the tip! I just try it, it works. This behavior is not documented, so it is quite confusing.
I try also to use collections.OrderedDict, as a quick fix, but it does not work. It seems we need here a simple resolution order.

[python-dev]

New changeset 8ae1c28445f8 by Vinay Sajip in branch '2.7':
Issue bpo-17508: Handled out-of-order handler configuration correctly.
http://hg.python.org/cpython/rev/8ae1c28445f8

New changeset ea00ae184d60 by Vinay Sajip in branch '3.2':
Issue bpo-17508: Handled out-of-order handler configuration correctly.
http://hg.python.org/cpython/rev/ea00ae184d60

New changeset d674bbbed333 by Vinay Sajip in branch '3.3':
Issue bpo-17508: Merged fix from 3.2.
http://hg.python.org/cpython/rev/d674bbbed333

New changeset b916efe30d77 by Vinay Sajip in branch 'default':
Closes bpo-17508: Merged fix from 3.3.
http://hg.python.org/cpython/rev/b916efe30d77

[python-dev]

New changeset 5f6747a0ffc4 by Vinay Sajip in branch '2.7':
Updated Misc/NEWS with bpo-17508.
http://hg.python.org/cpython/rev/5f6747a0ffc4

New changeset 5f7185cae787 by Vinay Sajip in branch '3.2':
Updated Misc/NEWS with bpo-17508.
http://hg.python.org/cpython/rev/5f7185cae787

New changeset bef32463ecd2 by Vinay Sajip in branch '3.3':
Merged Misc/NEWS update for bpo-17508.
http://hg.python.org/cpython/rev/bef32463ecd2

New changeset 6dc72bd91de1 by Vinay Sajip in branch 'default':
Merged Misc/NEWS update for bpo-17508.
http://hg.python.org/cpython/rev/6dc72bd91de1