Re: unpickling derived LogRecord in python 2.7 from python2.6

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From	Peter Otten <__peter__@web.de>
Newsgroups	comp.lang.python
Subject	Re: unpickling derived LogRecord in python 2.7 from python2.6
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Date	Thu, 28 Apr 2011 09:22:06 +0200
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Vinay Sajip wrote:

> On Apr 27, 5:41 pm, Peter Otten <__pete...@web.de> wrote:
> 
>> The Problem is that as of Python 2.7logging.LogRecord has become a
>> newstyle class which is pickled/unpickled differently. I don't know if
>> there is an official way to do the conversion, but here's what I've
>> hacked up. The script can read pickles written with 2.6 in 2.7, but not
>> the other way round.
>> [code snipped]
> 
> I don't know about "official", but another way of doing this is to
> pickle just the LogRecord's __dict__ and send that over the wire. The
> logging package contains a function makeLogRecord(d) where d is a
> dict.

You are right, my approach is too complicated and only needed when the OP 
cannot modify the sending script -- which is unlikely.

> This is the approach used by the examples in the library documentation
> which pickle events for sending across a network:
> 
> http://docs.python.org/howto/logging-cookbook.html#sending-and-receiving-
logging-events-across-a-network
> 
> The built-in SocketHandler pickles the LogRecord's __dict__ rather
> than the LogRecord itself, precisely because of the improved
> interoperability over pickling the instance directly.

As a minimal change ensuring that the logging.LogRecord subclass used by the 
OP is a newstyle class in 2.6 with

class LogRecord(logging.LogRecord, object):
    #...

should work, too.

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Thread

unpickling derived LogRecord in python 2.7 from python2.6 "ivdneut@gmail.com" <ivdneut@gmail.com> - 2011-04-27 06:56 -0700
  Re: unpickling derived LogRecord in python 2.7 from python2.6 Peter Otten <__peter__@web.de> - 2011-04-27 18:41 +0200
    Re: unpickling derived LogRecord in python 2.7 from python2.6 Vinay Sajip <vinay_sajip@yahoo.co.uk> - 2011-04-27 13:39 -0700
      Re: unpickling derived LogRecord in python 2.7 from python2.6 Peter Otten <__peter__@web.de> - 2011-04-28 09:22 +0200
        Re: unpickling derived LogRecord in python 2.7 from python2.6 "ivdneut@gmail.com" <ivdneut@gmail.com> - 2011-04-29 01:36 -0700

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