77 lines
2.0 KiB
Python
77 lines
2.0 KiB
Python
# Copyright 2014 Huawei Technologies Co. Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Module to provider util functions in all compass code
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.. moduleauthor:: Xiaodong Wang <xiaodongwang@huawei.com>
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"""
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import daemon
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import logging
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import signal
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import sys
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import time
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from compass.utils import flags
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flags.add_bool('daemonize',
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help='run as daemon',
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default=False)
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BUSY = False
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KILLED = False
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def handle_term(signum, frame):
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"""Handle sig term."""
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global KILLED
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logging.info('Caught signal %s in %s', signum, frame)
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KILLED = True
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if not BUSY:
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sys.exit(0)
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def _daemon(callback, run_interval):
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"""help function to run callback in daemon."""
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global BUSY
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signal.signal(signal.SIGTERM, handle_term)
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signal.signal(signal.SIGHUP, handle_term)
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while True:
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BUSY = True
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callback()
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BUSY = False
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if KILLED:
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logging.info('exit loop')
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break
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if run_interval > 0:
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logging.info('will rerun after %s seconds',
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flags.OPTIONS.run_interval)
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time.sleep(flags.OPTIONS.run_interval)
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else:
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logging.info('finish loop')
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break
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def daemonize(callback, run_interval, **kwargs):
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"""daemonize callback and run every run_interval seconds."""
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if flags.OPTIONS.daemonize:
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with daemon.DaemonContext(**kwargs):
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logging.info('run as daemon')
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_daemon(callback, run_interval)
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else:
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_daemon(callback, run_interval)
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