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86 lines
3.5 KiB
Python
86 lines
3.5 KiB
Python
#
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# handlers.py -- Custom logging handlers
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#
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# Copyright (c) 2010 Christian Hammond
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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import logging
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import os
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from stat import ST_DEV, ST_INO
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# This is a port of Python 2.6's WatchedFileHandler. It should only be
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# used if logging.handlers.WatchedFileHandler can't be imported.
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#
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# This class is copyright by the Python Software Foundation.
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# See http://www.python.org/psf/license/ for details.
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class WatchedFileHandler(logging.FileHandler):
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"""
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A handler for logging to a file, which watches the file
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to see if it has changed while in use. This can happen because of
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usage of programs such as newsyslog and logrotate which perform
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log file rotation. This handler, intended for use under Unix,
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watches the file to see if it has changed since the last emit.
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(A file has changed if its device or inode have changed.)
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If it has changed, the old file stream is closed, and the file
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opened to get a new stream.
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This handler is not appropriate for use under Windows, because
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under Windows open files cannot be moved or renamed - logging
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opens the files with exclusive locks - and so there is no need
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for such a handler. Furthermore, ST_INO is not supported under
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Windows; stat always returns zero for this value.
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This handler is based on a suggestion and patch by Chad J.
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Schroeder.
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"""
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def __init__(self, filename, mode='a', encoding=None, delay=0):
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logging.FileHandler.__init__(self, filename, mode, encoding)
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if not os.path.exists(self.baseFilename):
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self.dev, self.ino = -1, -1
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else:
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stat = os.stat(self.baseFilename)
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self.dev, self.ino = stat[ST_DEV], stat[ST_INO]
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def emit(self, record):
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"""
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Emit a record.
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First check if the underlying file has changed, and if it
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has, close the old stream and reopen the file to get the
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current stream.
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"""
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if not os.path.exists(self.baseFilename):
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stat = None
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changed = 1
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else:
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stat = os.stat(self.baseFilename)
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changed = (stat[ST_DEV] != self.dev) or (stat[ST_INO] != self.ino)
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if changed and self.stream is not None:
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self.stream.flush()
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self.stream.close()
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self.stream = self._open()
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if stat is None:
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stat = os.stat(self.baseFilename)
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self.dev, self.ino = stat[ST_DEV], stat[ST_INO]
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logging.FileHandler.emit(self, record)
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