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# 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 file is part of cloud-init. See LICENSE file for license information.
import imp
import logging
import sys
# Default fallback format
FALL_FORMAT = ('FALLBACK: %(asctime)s - %(filename)s[%(levelname)s]: ' +
'%(message)s')
class QuietStreamHandler(logging.StreamHandler):
def handleError(self, record):
pass
def _patch_logging():
# Replace 'handleError' 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
fallback_handler = QuietStreamHandler(sys.stderr)
fallback_handler.setFormatter(logging.Formatter(FALL_FORMAT))
def handleError(self, record):
try:
fallback_handler.handle(record)
fallback_handler.flush()
except IOError:
pass
setattr(logging.Handler, 'handleError', handleError)
def patch():
imp.acquire_lock()
try:
_patch_logging()
finally:
imp.release_lock()
# vi: ts=4 expandtab
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