logger.py 2.51 KB
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# Copyright 2013 GRNET S.A. All rights reserved.
#
# Redistribution and use in source and binary forms, with or
# without modification, are permitted provided that the following
# conditions are met:
#
#   1. Redistributions of source code must retain the above
#      copyright notice, this list of conditions and the following
#      disclaimer.
#
#   2. Redistributions in binary form must reproduce the above
#      copyright notice, this list of conditions and the following
#      disclaimer in the documentation and/or other materials
#      provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and
# documentation are those of the authors and should not be
# interpreted as representing official policies, either expressed
# or implied, of GRNET S.A.

import logging


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LOG_FILE = [
    '/var/log/kamaki.log',
    '/var/log/kamaki/clients.log',
    '/tmp/kamaki.log',
    'kamaki.log']


def get_log_filename():
    for logfile in LOG_FILE:
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        try:
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            with open(logfile, 'a+') as f:
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                f.seek(0)
        except IOError:
            continue
        return logfile
    print('Failed to open any logging locations, file-logging aborted')


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def set_log_filename(filename):
    global LOG_FILE
    LOG_FILE = [filename] + LOG_FILE


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def add_file_logger(
        name, caller,
        level=logging.DEBUG, prefix='', filename='/tmp/kamaki.log'):
    try:
        assert caller and filename
        logger = logging.getLogger(name)
        h = logging.FileHandler(filename)
        fmt = logging.Formatter(
            '%(asctime)s ' + caller + ' %(name)s-%(levelname)s: %(message)s')
        h.setFormatter(fmt)
        logger.addHandler(h)
        logger.setLevel(level)
    except Exception:
        pass


def get_logger(name):
    return logging.getLogger(name)