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# loggingutil.py - utility for logging events
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#
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# Copyright 2010 Nicolas Dumazet
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# Copyright 2013 Facebook, Inc.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import errno
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from . import (
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pycompat,
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)
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def openlogfile(ui, vfs, name, maxfiles=0, maxsize=0):
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"""Open log file in append mode, with optional rotation
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If maxsize > 0, the log file will be rotated up to maxfiles.
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"""
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def rotate(oldpath, newpath):
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try:
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vfs.unlink(newpath)
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except OSError as err:
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if err.errno != errno.ENOENT:
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ui.debug("warning: cannot remove '%s': %s\n" %
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(newpath, err.strerror))
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try:
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if newpath:
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vfs.rename(oldpath, newpath)
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except OSError as err:
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if err.errno != errno.ENOENT:
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ui.debug("warning: cannot rename '%s' to '%s': %s\n" %
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(newpath, oldpath, err.strerror))
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if maxsize > 0:
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try:
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st = vfs.stat(name)
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except OSError:
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pass
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else:
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if st.st_size >= maxsize:
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path = vfs.join(name)
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for i in pycompat.xrange(maxfiles - 1, 1, -1):
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rotate(oldpath='%s.%d' % (path, i - 1),
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newpath='%s.%d' % (path, i))
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rotate(oldpath=path,
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newpath=maxfiles > 0 and path + '.1')
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return vfs(name, 'a', makeparentdirs=False)
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class proxylogger(object):
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"""Forward log events to another logger to be set later"""
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def __init__(self):
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self.logger = None
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def tracked(self, event):
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return self.logger is not None and self.logger.tracked(event)
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def log(self, ui, event, msg, opts):
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assert self.logger is not None
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self.logger.log(ui, event, msg, opts)
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