114 lines
4.0 KiB
Python
114 lines
4.0 KiB
Python
# Copyright (c) 2010-2012 OpenStack Foundation
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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
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# 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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import os
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import sys
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import time
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import signal
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from re import sub
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import eventlet.debug
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from swift.common import utils
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class Daemon(object):
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"""Daemon base class"""
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def __init__(self, conf):
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self.conf = conf
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self.logger = utils.get_logger(conf, log_route='daemon')
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def run_once(self, *args, **kwargs):
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"""Override this to run the script once"""
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raise NotImplementedError('run_once not implemented')
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def run_forever(self, *args, **kwargs):
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"""Override this to run forever"""
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raise NotImplementedError('run_forever not implemented')
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def run(self, once=False, **kwargs):
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"""Run the daemon"""
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utils.validate_configuration()
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utils.drop_privileges(self.conf.get('user', 'swift'))
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utils.capture_stdio(self.logger, **kwargs)
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def kill_children(*args):
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signal.signal(signal.SIGTERM, signal.SIG_IGN)
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os.killpg(0, signal.SIGTERM)
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sys.exit()
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signal.signal(signal.SIGTERM, kill_children)
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if once:
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self.run_once(**kwargs)
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else:
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self.run_forever(**kwargs)
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def run_daemon(klass, conf_file, section_name='', once=False, **kwargs):
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"""
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Loads settings from conf, then instantiates daemon "klass" and runs the
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daemon with the specified once kwarg. The section_name will be derived
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from the daemon "klass" if not provided (e.g. ObjectReplicator =>
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object-replicator).
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:param klass: Class to instantiate, subclass of common.daemon.Daemon
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:param conf_file: Path to configuration file
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:param section_name: Section name from conf file to load config from
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:param once: Passed to daemon run method
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"""
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# very often the config section_name is based on the class name
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# the None singleton will be passed through to readconf as is
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if section_name is '':
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section_name = sub(r'([a-z])([A-Z])', r'\1-\2',
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klass.__name__).lower()
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conf = utils.readconf(conf_file, section_name,
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log_name=kwargs.get('log_name'))
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# once on command line (i.e. daemonize=false) will over-ride config
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once = once or not utils.config_true_value(conf.get('daemonize', 'true'))
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# pre-configure logger
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if 'logger' in kwargs:
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logger = kwargs.pop('logger')
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else:
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logger = utils.get_logger(conf, conf.get('log_name', section_name),
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log_to_console=kwargs.pop('verbose', False),
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log_route=section_name)
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# disable fallocate if desired
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if utils.config_true_value(conf.get('disable_fallocate', 'no')):
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utils.disable_fallocate()
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# set utils.FALLOCATE_RESERVE if desired
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reserve = int(conf.get('fallocate_reserve', 0))
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if reserve > 0:
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utils.FALLOCATE_RESERVE = reserve
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# By default, disable eventlet printing stacktraces
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eventlet_debug = utils.config_true_value(conf.get('eventlet_debug', 'no'))
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eventlet.debug.hub_exceptions(eventlet_debug)
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# Ensure TZ environment variable exists to avoid stat('/etc/localtime') on
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# some platforms. This locks in reported times to the timezone in which
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# the server first starts running in locations that periodically change
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# timezones.
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os.environ['TZ'] = time.strftime("%z", time.gmtime())
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try:
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klass(conf).run(once=once, **kwargs)
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except KeyboardInterrupt:
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logger.info('User quit')
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logger.info('Exited')
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