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# Copyright 2010-2011 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
__metaclass__ = type
__all__ = [
"get_logger",
]
import re
import sys
import time
import logging
from logging import (
StreamHandler,
FileHandler,
)
class Formatter(logging.Formatter):
"""Formatter encoding our preferred output format."""
def __init__(self, fmt=None, datefmt=None):
if fmt is None:
fmt = '%(asctime)s %(levelname)-7s %(message)s'
if datefmt is None:
datefmt = "%Y-%m-%d %H:%M:%S"
logging.Formatter.__init__(self, fmt, datefmt)
self.converter = time.gmtime # Output should be UTC
def reset_logger(logger):
"""Reset the state of the given logger instance."""
for handler in logger.handlers[:]:
handler.flush()
try:
handler.close()
except KeyError:
pass
logger.removeHandler(handler)
def get_logger(level, log_stream=None, log_file=None, name=None):
root_logger = logging.getLogger()
reset_logger(root_logger)
# Log to the given file or the default stream
if log_file:
handler = FileHandler(log_file)
else:
handler = StreamHandler(log_stream)
# Set the level on the handler rather than the logger
level = logging.getLevelName(level.upper())
handler.setLevel(level)
root_logger.setLevel(0)
# Do the same for the formatter
formatter = Formatter()
handler.setFormatter(formatter)
root_logger.addHandler(handler)
# Create our own logger
if name is None:
name = sys.argv[0]
name = re.sub(r".py[oc]?$", "", name)
return logging.getLogger(name)
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