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# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
import collections
import io
import logging
import logging.config
import logging.handlers
import os
import sys
import time
# Logging levels for easy access
CRITICAL = logging.CRITICAL
FATAL = logging.FATAL
ERROR = logging.ERROR
WARNING = logging.WARNING
WARN = logging.WARN
INFO = logging.INFO
DEBUG = logging.DEBUG
NOTSET = logging.NOTSET
# Default basic format
DEF_CON_FORMAT = '%(asctime)s - %(filename)s[%(levelname)s]: %(message)s'
# Always format logging timestamps as UTC time
logging.Formatter.converter = time.gmtime
def setupBasicLogging(level=DEBUG, formatter=None):
if not formatter:
formatter = logging.Formatter(DEF_CON_FORMAT)
root = logging.getLogger()
for handler in root.handlers:
if hasattr(handler, 'stream') and hasattr(handler.stream, 'name'):
if handler.stream.name == '<stderr>':
handler.setLevel(level)
return
# Didn't have an existing stderr handler; create a new handler
console = logging.StreamHandler(sys.stderr)
console.setFormatter(formatter)
console.setLevel(level)
root.addHandler(console)
root.setLevel(level)
def flushLoggers(root):
if not root:
return
for h in root.handlers:
if isinstance(h, (logging.StreamHandler)):
try:
h.flush()
except IOError:
pass
flushLoggers(root.parent)
def setupLogging(cfg=None):
# See if the config provides any logging conf...
if not cfg:
cfg = {}
log_cfgs = []
log_cfg = cfg.get('logcfg')
if log_cfg and isinstance(log_cfg, str):
# If there is a 'logcfg' entry in the config,
# respect it, it is the old keyname
log_cfgs.append(str(log_cfg))
elif "log_cfgs" in cfg:
for a_cfg in cfg['log_cfgs']:
if isinstance(a_cfg, str):
log_cfgs.append(a_cfg)
elif isinstance(a_cfg, (collections.Iterable)):
cfg_str = [str(c) for c in a_cfg]
log_cfgs.append('\n'.join(cfg_str))
else:
log_cfgs.append(str(a_cfg))
# See if any of them actually load...
am_tried = 0
for log_cfg in log_cfgs:
try:
am_tried += 1
# Assume its just a string if not a filename
if log_cfg.startswith("/") and os.path.isfile(log_cfg):
# Leave it as a file and do not make it look like
# something that is a file (but is really a buffer that
# is acting as a file)
pass
else:
log_cfg = io.StringIO(log_cfg)
# Attempt to load its config
logging.config.fileConfig(log_cfg)
# The first one to work wins!
return
except Exception:
# We do not write any logs of this here, because the default
# configuration includes an attempt at using /dev/log, followed
# up by writing to a file. /dev/log will not exist in very early
# boot, so an exception on that is expected.
pass
# If it didn't work, at least setup a basic logger (if desired)
basic_enabled = cfg.get('log_basic', True)
sys.stderr.write(("WARN: no logging configured!"
" (tried %s configs)\n") % (am_tried))
if basic_enabled:
sys.stderr.write("Setting up basic logging...\n")
setupBasicLogging()
def getLogger(name='cloudinit'):
return logging.getLogger(name)
def _resetLogger(log):
"""Remove all current handlers, unset log level and add a NullHandler.
(Adding the NullHandler avoids "No handlers could be found for logger XXX"
messages.)
"""
if not log:
return
handlers = list(log.handlers)
for h in handlers:
h.flush()
h.close()
log.removeHandler(h)
log.setLevel(NOTSET)
log.addHandler(logging.NullHandler())
def resetLogging():
_resetLogger(logging.getLogger())
_resetLogger(getLogger())
resetLogging()
# vi: ts=4 expandtab
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