136 lines
4.2 KiB
Python
136 lines
4.2 KiB
Python
#!/usr/bin/env python
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# Copyright 2012 Hewlett-Packard Development Company, L.P.
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# Copyright 2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import argparse
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import daemon
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import errno
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import extras
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# as of python-daemon 1.6 it doesn't bundle pidlockfile anymore
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# instead it depends on lockfile-0.9.1 which uses pidfile.
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pid_file_module = extras.try_imports(['daemon.pidlockfile', 'daemon.pidfile'])
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import logging
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import os
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import sys
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import signal
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import nodepool.cmd
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import nodepool.nodepool
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import nodepool.webapp
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log = logging.getLogger(__name__)
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def is_pidfile_stale(pidfile):
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""" Determine whether a PID file is stale.
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Return 'True' ("stale") if the contents of the PID file are
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valid but do not match the PID of a currently-running process;
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otherwise return 'False'.
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"""
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result = False
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pidfile_pid = pidfile.read_pid()
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if pidfile_pid is not None:
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try:
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os.kill(pidfile_pid, 0)
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except OSError as exc:
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if exc.errno == errno.ESRCH:
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# The specified PID does not exist
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result = True
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return result
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class NodePoolDaemon(nodepool.cmd.NodepoolApp):
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def parse_arguments(self):
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parser = argparse.ArgumentParser(description='Node pool.')
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parser.add_argument('-c', dest='config',
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default='/etc/nodepool/nodepool.yaml',
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help='path to config file')
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parser.add_argument('-s', dest='secure',
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default='/etc/nodepool/secure.conf',
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help='path to secure file')
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parser.add_argument('-d', dest='nodaemon', action='store_true',
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help='do not run as a daemon')
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parser.add_argument('-l', dest='logconfig',
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help='path to log config file')
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parser.add_argument('-p', dest='pidfile',
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help='path to pid file',
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default='/var/run/nodepool/nodepool.pid')
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parser.add_argument('--no-webapp', action='store_true')
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parser.add_argument('--version', dest='version', action='store_true',
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help='show version')
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self.args = parser.parse_args()
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def exit_handler(self, signum, frame):
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self.pool.stop()
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if not self.args.no_webapp:
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self.webapp.stop()
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sys.exit(0)
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def term_handler(self, signum, frame):
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os._exit(0)
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def main(self):
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self.setup_logging()
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self.pool = nodepool.nodepool.NodePool(self.args.secure,
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self.args.config)
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if not self.args.no_webapp:
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self.webapp = nodepool.webapp.WebApp(self.pool)
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signal.signal(signal.SIGINT, self.exit_handler)
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# For back compatibility:
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signal.signal(signal.SIGUSR1, self.exit_handler)
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signal.signal(signal.SIGUSR2, nodepool.cmd.stack_dump_handler)
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signal.signal(signal.SIGTERM, self.term_handler)
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self.pool.start()
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if not self.args.no_webapp:
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self.webapp.start()
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while True:
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signal.pause()
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def main():
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npd = NodePoolDaemon()
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npd.parse_arguments()
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if npd.args.version:
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from nodepool.version import version_info as npd_version_info
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print "Nodepool version: %s" % npd_version_info.version_string()
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return(0)
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pid = pid_file_module.TimeoutPIDLockFile(npd.args.pidfile, 10)
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if is_pidfile_stale(pid):
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pid.break_lock()
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if npd.args.nodaemon:
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npd.main()
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else:
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with daemon.DaemonContext(pidfile=pid):
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npd.main()
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if __name__ == "__main__":
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sys.exit(main())
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