RotatingFileHandler and logging config file
Hello,
I've successfully coded Python to do what I want with a
RotatingFileHandler, but am having trouble getting the same behavior via
a config file.
I wanted to create one log file each time I run my app, with up to 10
files kept from the last invocations. This was accomplished with
self._logger = logging.getLogger('PDGUI')
# We will rotate the files 'manually', so use zero rotate size.
handler = logging.handlers.RotatingFileHandler( \
"..\\PDGUI.log", "a", 0, 10)
handler.doRollover() # force the next file to be used
formatter = logging.Formatter("%(asctime)s " + \
"%(levelname)s\t%(message)s")
handler.setFormatter(formatter)
self._logger.addHandler(handler)
self._logger.setLevel(logging.INFO)
I'd like to do the same thing with a config file (so that, if this
*isn't* the behavior I want, I can change the config file, of course).
I started with a rather plain config file, with the only interesting bit
being:
[handler_hand01]
class=handlers.RotatingFileHandler
level=NOTSET
formatter=form01
args=("..\\PDGUI.log", "a", 0, 10,)
But I still have one problem - how do I force the "handler.doRollover()"
to happen with the config file? There doesn't seem to be any way to do
this in the config file itself, which is OK and perhaps appropriate
[BTW, has anyone else noticed that RotatingFileHandler isn't documented
in the docs? All the other file handlers have at least a paragraph on
their options, but nothing for RFH!]
I can't find any way to do the handler.doRollover() in code, either, if
I've started off with a config file. Something like
logging.config.fileConfig(options.logconfig)
# BUGBUG If the config file specifies a RotatingFileHandler,
# we need to force a doRollover now, but there's no way!
#
handler = logging.getLogger().getHandler() # THIS DOESN'T EXIST!
handler.doRollover() # force the next file to be used
Ideas, suggestions, etc? It's too bad - with the code method, I can do
exactly what I want, but not with the config file.
- rob
--
http://mail.python.org/mailman/listinfo/python-list
Re: RotatingFileHandler and logging config file
Kent Johnson wrote: It is in the latest docs. Kent No, it isn't. (But thanks for replying anyway!) http://docs.python.org/lib/logging-config-fileformat.html has all the others (OK, maybe not all, I haven't thoroughly checked, but it's got nine of 'em) but nothing for RFH. Or is that not "the latest docs"? - rob -- http://mail.python.org/mailman/listinfo/python-list
Re: RotatingFileHandler and logging config file
news.sydney.pipenetworks.com wrote: You're looking in the wrong place. Try http://docs.python.org/lib/node333.html which isn't quite the page in question, but leads to the closest pertinent page, http://docs.python.org/lib/logging-config-fileformat.html which *still* has nothing on RotatingFileHandler. That's OK, I've given up on the idea of being able to configure a RotatingFileHandler from a config file; I'll do it in my code as a default, and if users want any *other* behavior, they can config *that*. - rob -- http://mail.python.org/mailman/listinfo/python-list
Re: RotatingFileHandler and logging config file
Peter Hansen wrote:
The missing piece of the puzzle might be the connection
between the 'args' in the config file and the arguments
passed to the __init__ method of the class
Yes, I can puzzle out the constructor args ("constructor", heh heh, must
be a Java Man) but it's how to get it to do a doRollover() that's in
question. No sign of support for it in the docs (which your link to
doesn't elucidate RotatingFileHandler any better than my original) but
that's OK, see my following message to <[EMAIL PROTECTED]> (what a
funny name!)
- rob
--
http://mail.python.org/mailman/listinfo/python-list
Re: RotatingFileHandler and logging config file
Bengt Richter wrote: The first hit is http://docs.python.org/lib/node332.html HTH NID (No, It Doesn't) ;-) but thanks anyway. To reiterate, the question is how to make RotatingFileHandler do a doRotate() on startup from a *config file*. No mention of that in what you point to. - rob -- http://mail.python.org/mailman/listinfo/python-list
Re: RotatingFileHandler and logging config file
news.sydney.pipenetworks.com wrote: Yeah...sorry about that. I misunderstood what node333.html was used for. Looks like your best bet may be to extend the RotatingFileHandler directly in the handlers module and call doRollover() in __init__. Ah, now *there's* an intriguing approach! I am too much a Python noob to know - can I subclass RFH and then invoke that new class from a config file (the crux of my original question) ? I may play around with it today Thanks, - rob -- http://mail.python.org/mailman/listinfo/python-list
