Source code for pywikibot.tools._logging
# -*- coding: utf-8 -*-
"""Logging tools."""
#
# (C) Pywikibot team, 2009-2020
#
# Distributed under the terms of the MIT license.
#
import logging
import os
# Logging module configuration
[docs]class RotatingFileHandler(logging.handlers.RotatingFileHandler):
"""Modified RotatingFileHandler supporting unlimited amount of backups."""
[docs] def doRollover(self):
"""Modified naming system for logging files.
Overwrites the default Rollover renaming by inserting the count
number between file name root and extension. If backupCount is
>= 1, the system will successively create new files with the
same pathname as the base file, but with inserting ".1", ".2"
etc. in front of the filename suffix. For example, with a
backupCount of 5 and a base file name of "app.log", you would
get "app.log", "app.1.log", "app.2.log", ... through to
"app.5.log". The file being written to is always "app.log" -
when it gets filled up, it is closed and renamed to "app.1.log",
and if files "app.1.log", "app.2.log" etc. already exist, then
they are renamed to "app.2.log", "app.3.log" etc. respectively.
If backupCount is == -1 do not rotate but create new numbered
filenames. The newest file has the highest number except some
older numbered files where deleted and the bot was restarted.
In this case the ordering starts from the lowest available
(unused) number.
"""
fmt = '{}.{}{}'
if self.stream:
self.stream.close()
self.stream = None
root, ext = os.path.splitext(self.baseFilename)
if self.backupCount > 0:
for i in range(self.backupCount - 1, 0, -1):
sfn = self.rotation_filename(fmt.format(root, i, ext))
dfn = self.rotation_filename(fmt.format(root, i + 1, ext))
if os.path.exists(sfn):
if os.path.exists(dfn):
os.remove(dfn)
os.rename(sfn, dfn)
dfn = self.rotation_filename(fmt.format(root, 1, ext))
if os.path.exists(dfn):
os.remove(dfn)
self.rotate(self.baseFilename, dfn)
elif self.backupCount == -1:
if not hasattr(self, '_last_no'):
self._last_no = 1
while True:
fn = self.rotation_filename(fmt.format(root, self._last_no,
ext))
self._last_no += 1
if not os.path.exists(fn):
break
self.rotate(self.baseFilename, fn)
self.mode = 'w'
if not self.delay:
self.stream = self._open()