improvements sought re. logging across modules

[Chris “Kwpolska” Warrick]

On Wed, Apr 24, 2013 at 6:54 PM, The Night Tripper <jkn+gg at nicorp.co.uk> wrote:
> Hi all
>         I have a small suite of python modules, say
>
>         A.py
>         B.py
>         C.py
>
> which can be invoked in a variety of ways. eg.
>
> 1) A.py is invoked directly; this imports and uses B.py and C.py
>
> 2) B.py is invoked; this imports and uses A.py and C.py
>
> I use the logging module in all of these python modules, and I want to be
> able to use a single logger across the entire suite of whichever set of
> scripts is running.
>
> The way I do this at the moment is to have a separate module mylogger.py:
>
> == mylogger.py ==
>
> import logging
>
> class MyLogger:   #using python 2.4 ;-o
>     def __init__(self):
>         self.log = logging.getLogger(MY_APP_NAME)
>     def setupLogging(self):
>         self.log.setlevel(logging.DEBUG)
>         # ...
>
> # our singleton logging object
> mylogger = Mylogger()
> # EOF
>
> and then in my other modules A.py, B.py etc. I have something like:
>
> == A.py ==
>
> import mylogger
> gLog = mylogger.mylogger
>
> if __name__ == "__main__":
>     gLog.setupLogging()
>     gLog.info("Module A running as main")
>     main()
> #EOF
>
> == B.py ==
>
> import mylogger
> gLog = mylogger.mylogger
>
> if __name__ == "__main__":
>     gLog.setupLogging()
>     gLog.info("Module B running as main")
>     main()
> # EOF
>
> This works, but I can't help thinking I'm missing a trick here. Any
> suggestions?
>
>     Thanks
>     j^n
>
> --
> http://mail.python.org/mailman/listinfo/python-list

No need to do such magic.  Just set logging up as you would normally.
The first logging instance should pick up logs from everywhere.  For
example:

=== aurqt/aqds.py ===
class AQDS:
    logging.basicConfig(format='%(asctime)-15s [%(levelname)-7s] '
                        ':%(name)-10s: %(message)s',
                        filename=os.path.join(confdir, 'aurqt.log'),
                        level=logging.DEBUG)
    log = logging.getLogger('aurqt')
    console = logging.StreamHandler()
    console.setLevel(logging.INFO)
    console.setFormatter(logging.Formatter('[%(levelname)-7s] '
                         ':%(name)-10s: %(message)s'))
    logging.getLogger('').addHandler(console)
    log.info('*** aurqt v' + __version__)

=== pkgbuilder/pbds.py ===
class PBDS:
    logging.basicConfig(format='%(asctime)-15s [%(levelname)-7s] '
                        ':%(name)-10s: %(message)s',
                        filename=os.path.join(confdir, 'pkgbuilder.log'),
                        level=logging.DEBUG)
    log = logging.getLogger('pkgbuilder')
    log.info('*** PKGBUILDer v' + __version__)

=== aurqt/__init__.py ===
from .aqds import AQDS
DS = AQDS()
import pkgbuilder # ← also imports pkgbuilder.DS = pkgbuilder.pbds.PBDS()

=== bin/aurqt output ===
[INFO   ] :aurqt     : *** aurqt v0.1.0
[INFO   ] :requests.packages.urllib3.connectionpool: Starting new
HTTPS connection (1): aur.archlinux.org
[WARNING] :pkgbuilder: tty-clock version is a date, ignored for downgrade.

=== {confdir}/aurqt.log ===
2013-04-24 19:34:21,079 [INFO   ] :aurqt     : *** aurqt v0.1.0
2013-04-24 19:35:19,096 [WARNING]
:requests.packages.urllib3.connectionpool: Starting new HTTPS
connection (1): aur.archlinux.org
2013-04-24 19:35:21,004 [WARNING] :pkgbuilder: tty-clock version is a
date, ignored for downgrade.

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