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# Copyright 2014 Huawei Technologies Co. Ltd
#
# 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.
"""Module to provider util functions in all compass code
.. moduleauthor:: Xiaodong Wang <xiaodongwang@huawei.com>
"""
import daemon
import logging
import signal
import sys
import time
from compass.utils import flags
flags.add_bool('daemonize',
help='run as daemon',
default=False)
BUSY = False
KILLED = False
def handle_term(signum, frame):
"""Handle sig term."""
global KILLED
logging.info('Caught signal %s in %s', signum, frame)
KILLED = True
if not BUSY:
sys.exit(0)
def _daemon(callback, run_interval):
"""help function to run callback in daemon."""
global BUSY
signal.signal(signal.SIGTERM, handle_term)
signal.signal(signal.SIGHUP, handle_term)
while True:
BUSY = True
callback()
BUSY = False
if KILLED:
logging.info('exit loop')
break
if run_interval > 0:
logging.info('will rerun after %s seconds',
flags.OPTIONS.run_interval)
time.sleep(flags.OPTIONS.run_interval)
else:
logging.info('finish loop')
break
def daemonize(callback, run_interval, **kwargs):
"""daemonize callback and run every run_interval seconds."""
if flags.OPTIONS.daemonize:
with daemon.DaemonContext(**kwargs):
logging.info('run as daemon')
_daemon(callback, run_interval)
else:
_daemon(callback, run_interval)
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