65 lines
1.9 KiB
Python
65 lines
1.9 KiB
Python
# Copyright (c) 2010 OpenStack, LLC.
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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 signal
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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, 'swift-daemon')
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def run_once(self):
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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):
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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, capture_stdout=True, capture_stderr=True):
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"""Run the daemon"""
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# log uncaught exceptions
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sys.excepthook = lambda *exc_info: \
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self.logger.critical('UNCAUGHT EXCEPTION', exc_info=exc_info)
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if capture_stdout:
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sys.stdout = utils.LoggerFileObject(self.logger)
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if capture_stderr:
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sys.stderr = utils.LoggerFileObject(self.logger)
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utils.drop_privileges(self.conf.get('user', 'swift'))
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try:
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os.setsid()
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except OSError:
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pass
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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()
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else:
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self.run_forever()
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