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# Copyright 2014 Microsoft Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Requires Python 2.4+ and openssl_bin 1.0+
#
"""
Log utils
"""
import os
import sys
from azurelinuxagent.common.future import ustr
from datetime import datetime, timedelta
EVERY_DAY = timedelta(days=1)
EVERY_HALF_DAY = timedelta(hours=12)
EVERY_HOUR = timedelta(hours=1)
EVERY_HALF_HOUR = timedelta(minutes=30)
EVERY_FIFTEEN_MINUTES = timedelta(minutes=15)
class Logger(object):
"""
Logger class
"""
def __init__(self, logger=None, prefix=None):
self.appenders = []
self.logger = self if logger is None else logger
self.periodic_messages = {}
self.prefix = prefix
def reset_periodic(self):
self.logger.periodic_messages = {}
def is_period_elapsed(self, delta, h):
return h not in self.logger.periodic_messages or \
(self.logger.periodic_messages[h] + delta) <= datetime.now()
def periodic(self, delta, msg_format, *args):
h = hash(msg_format)
if self.is_period_elapsed(delta, h):
self.info(msg_format, *args)
self.logger.periodic_messages[h] = datetime.now()
def verbose(self, msg_format, *args):
self.log(LogLevel.VERBOSE, msg_format, *args)
def info(self, msg_format, *args):
self.log(LogLevel.INFO, msg_format, *args)
def warn(self, msg_format, *args):
self.log(LogLevel.WARNING, msg_format, *args)
def error(self, msg_format, *args):
self.log(LogLevel.ERROR, msg_format, *args)
def log(self, level, msg_format, *args):
#if msg_format is not unicode convert it to unicode
if type(msg_format) is not ustr:
msg_format = ustr(msg_format, errors="backslashreplace")
if len(args) > 0:
msg = msg_format.format(*args)
else:
msg = msg_format
time = datetime.now().strftime(u'%Y/%m/%d %H:%M:%S.%f')
level_str = LogLevel.STRINGS[level]
if self.prefix is not None:
log_item = u"{0} {1} {2} {3}\n".format(time, level_str, self.prefix,
msg)
else:
log_item = u"{0} {1} {2}\n".format(time, level_str, msg)
log_item = ustr(log_item.encode('ascii', "backslashreplace"),
encoding="ascii")
for appender in self.appenders:
appender.write(level, log_item)
if self.logger != self:
for appender in self.logger.appenders:
appender.write(level, log_item)
def add_appender(self, appender_type, level, path):
appender = _create_logger_appender(appender_type, level, path)
self.appenders.append(appender)
class ConsoleAppender(object):
def __init__(self, level, path):
self.level = level
self.path = path
def write(self, level, msg):
if self.level <= level:
try:
with open(self.path, "w") as console:
console.write(msg)
except IOError:
pass
class FileAppender(object):
def __init__(self, level, path):
self.level = level
self.path = path
def write(self, level, msg):
if self.level <= level:
try:
with open(self.path, "a+") as log_file:
log_file.write(msg)
except IOError:
pass
class StdoutAppender(object):
def __init__(self, level):
self.level = level
def write(self, level, msg):
if self.level <= level:
try:
sys.stdout.write(msg)
except IOError:
pass
#Initialize logger instance
DEFAULT_LOGGER = Logger()
class LogLevel(object):
VERBOSE = 0
INFO = 1
WARNING = 2
ERROR = 3
STRINGS = [
"VERBOSE",
"INFO",
"WARNING",
"ERROR"
]
class AppenderType(object):
FILE = 0
CONSOLE = 1
STDOUT = 2
def add_logger_appender(appender_type, level=LogLevel.INFO, path=None):
DEFAULT_LOGGER.add_appender(appender_type, level, path)
def reset_periodic():
DEFAULT_LOGGER.reset_periodic()
def periodic(delta, msg_format, *args):
DEFAULT_LOGGER.periodic(delta, msg_format, *args)
def verbose(msg_format, *args):
DEFAULT_LOGGER.verbose(msg_format, *args)
def info(msg_format, *args):
DEFAULT_LOGGER.info(msg_format, *args)
def warn(msg_format, *args):
DEFAULT_LOGGER.warn(msg_format, *args)
def error(msg_format, *args):
DEFAULT_LOGGER.error(msg_format, *args)
def log(level, msg_format, *args):
DEFAULT_LOGGER.log(level, msg_format, args)
def _create_logger_appender(appender_type, level=LogLevel.INFO, path=None):
if appender_type == AppenderType.CONSOLE:
return ConsoleAppender(level, path)
elif appender_type == AppenderType.FILE:
return FileAppender(level, path)
elif appender_type == AppenderType.STDOUT:
return StdoutAppender(level)
else:
raise ValueError("Unknown appender type")
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