RotatingFileHan dler and logging config file

[Rob Cranfill]

Hello,

I've successfully coded Python to do what I want with a
RotatingFileHan dler, 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.getLogg er('PDGUI')
# We will rotate the files 'manually', so use zero rotate size.
handler = logging.handler s.RotatingFileH andler( \
"..\\PDGUI.log" , "a", 0, 10)
handler.doRollo ver() # force the next file to be used

formatter = logging.Formatt er("%(asctime) s " + \
"%(levelname)s\ t%(message)s")
handler.setForm atter(formatter )
self._logger.ad dHandler(handle r)
self._logger.se tLevel(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. RotatingFileHan dler
level=NOTSET
formatter=form0 1
args=("..\\PDGU I.log", "a", 0, 10,)
But I still have one problem - how do I force the "handler.doRoll over()"
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 RotatingFileHan dler 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.doRollo ver() in code, either, if
I've started off with a config file. Something like
logging.config. fileConfig(opti ons.logconfig)

# BUGBUG If the config file specifies a RotatingFileHan dler,
# we need to force a doRollover now, but there's no way!
#
handler = logging.getLogg er().getHandler () # THIS DOESN'T EXIST!
handler.doRollo ver() # 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

[Kent Johnson]

Rob Cranfill wrote:

[BTW, has anyone else noticed that RotatingFileHan dler isn't documented
in the docs? All the other file handlers have at least a paragraph on
their options, but nothing for RFH!]

It is in the latest docs.

Kent

[Rob Cranfill]

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-c...ileformat.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

[Peter Hansen]

Rob Cranfill wrote:

Kent Johnson wrote:

It is in the latest docs.
No, it isn't. (But thanks for replying anyway!)

Can you prove it isn't? ;-)
http://docs.python.org/lib/logging-c...ileformat.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"?

Sure, but it's not the only place to look in the current docs.
Try here instead: http://docs.python.org/lib/node332.html

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....

-Peter

[news.sydney.pipenetworks.com]

Rob Cranfill wrote:

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-c...ileformat.html

You're looking in the wrong place. Try

http://docs.python.org/lib/node333.html

Huy

[Rob Cranfill]

news.sydney.pip enetworks.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-c...ileformat.html
which *still* has nothing on RotatingFileHan dler.

That's OK, I've given up on the idea of being able to configure a
RotatingFileHan dler 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

[Rob Cranfill]

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 ("constructo r", 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 RotatingFileHan dler any better than my original) but
that's OK, see my following message to <ny*****@swiftd sl.com.au> (what a
funny name!)

- rob

[Bengt Richter]

On Wed, 16 Mar 2005 20:48:40 -0800, Rob Cranfill <ro*********@co mcast.dot.net> wrote:

news.sydney.pi penetworks.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-c...ileformat.html
which *still* has nothing on RotatingFileHan dler.

That's OK, I've given up on the idea of being able to configure a
RotatingFileHa ndler 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*.

To fish for yourself, go to google and put

RotatingFileHan dler site:docs.pytho n.org

in the search slot and click search.

The first hit is
http://docs.python.org/lib/node332.html

HTH

Regards,
Bengt Richter

[news.sydney.pipenetworks.com]

Rob Cranfill wrote:

news.sydney.pip enetworks.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-c...ileformat.html
which *still* has nothing on RotatingFileHan dler.

Yeah...sorry about that. I misunderstood what node333.html was used for.
Looks like your best bet may be to extend the RotatingFileHan dler
directly in the handlers module and call doRollover() in __init__.

Huy

[Rob Cranfill]

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 RotatingFileHan dler do a doRotate() on startup from a
*config file*. No mention of that in what you point to.

- rob