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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import logging
import sys
FALL_FORMAT = 'FALLBACK: %(asctime)s - %(filename)s[%(levelname)s]: %(message)s'
Handler = logging.Handler
class QuietStreamHandler(Handler):
def handleError(self, record):
pass
class FallbackHandler(Handler):
def __init__(self, level=logging.NOTSET, fb_handler=None):
super(FallbackHandler, self).__init__(level)
if not fb_handler:
self.fallback_handler = QuietStreamHandler(sys.stderr)
else:
self.fallback_handler = fb_handler
self.fallback_handler.setFormatter(logging.Formatter(FALL_FORMAT))
self.fallback_handler.setLevel(level)
def flush(self):
super(FallbackHandler, self).flush()
self.fallback_handler.flush()
def close(self):
super(FallbackHandler, self).close(self)
self.fallback_handler.close()
def setLevel(self, level):
super(FallbackHandler, self).setLevel(self, level)
self.fallback_logger.setLevel(level)
def handleError(self, record):
try:
self.fallback_logger.handle(record)
# Always ensure this one is flushed...
self.fallback_logger.flush()
except:
pass
def _patch_logging():
# Replace handler with one that will be more
# tolerant of errors in that it can avoid
# re-notifying on exceptions and when errors
# do occur, it can at least try to write to
# sys.stderr using a fallback logger
logging.Handler = FallbackHandler
def patch():
_patch_logging()
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