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zuul/zuul/cmd/launcher.py

113 lines
3.7 KiB

#!/usr/bin/env python
# Copyright 2012 Hewlett-Packard Development Company, L.P.
# Copyright 2013-2014 OpenStack Foundation
#
# 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.
import argparse
import daemon
import extras
# as of python-daemon 1.6 it doesn't bundle pidlockfile anymore
# instead it depends on lockfile-0.9.1 which uses pidfile.
pid_file_module = extras.try_imports(['daemon.pidlockfile', 'daemon.pidfile'])
import logging
import os
import sys
import signal
import zuul.cmd
# No zuul imports here because they pull in paramiko which must not be
# imported until after the daemonization.
# https://github.com/paramiko/paramiko/issues/59
# Similar situation with gear and statsd.
class Launcher(zuul.cmd.ZuulApp):
def parse_arguments(self):
parser = argparse.ArgumentParser(description='Zuul launch worker.')
parser.add_argument('-c', dest='config',
help='specify the config file')
parser.add_argument('-d', dest='nodaemon', action='store_true',
help='do not run as a daemon')
parser.add_argument('--version', dest='version', action='version',
version=self._get_version(),
help='show zuul version')
self.args = parser.parse_args()
def reconfigure_handler(self, signum, frame):
signal.signal(signal.SIGHUP, signal.SIG_IGN)
self.log.debug("Reconfiguration triggered")
self.read_config()
self.setup_logging('launcher', 'log_config')
try:
self.launcher.reconfigure(self.config)
except Exception:
self.log.exception("Reconfiguration failed:")
signal.signal(signal.SIGHUP, self.reconfigure_handler)
def exit_handler(self, signum, frame):
signal.signal(signal.SIGUSR1, signal.SIG_IGN)
self.launcher.stop()
self.launcher.join()
def main(self):
# See comment at top of file about zuul imports
import zuul.launcher.ansiblelaunchserver
self.setup_logging('launcher', 'log_config')
self.log = logging.getLogger("zuul.Launcher")
LaunchServer = zuul.launcher.ansiblelaunchserver.LaunchServer
self.launcher = LaunchServer(self.config)
self.launcher.start()
signal.signal(signal.SIGHUP, self.reconfigure_handler)
signal.signal(signal.SIGUSR1, self.exit_handler)
signal.signal(signal.SIGUSR2, zuul.cmd.stack_dump_handler)
while True:
try:
signal.pause()
except KeyboardInterrupt:
print "Ctrl + C: asking launcher to exit nicely...\n"
self.exit_handler(signal.SIGINT, None)
sys.exit(0)
def main():
server = Launcher()
server.parse_arguments()
server.read_config()
server.configure_connections()
if server.config.has_option('launcher', 'pidfile'):
pid_fn = os.path.expanduser(server.config.get('launcher', 'pidfile'))
else:
pid_fn = '/var/run/zuul-launcher/zuul-launcher.pid'
pid = pid_file_module.TimeoutPIDLockFile(pid_fn, 10)
if server.args.nodaemon:
server.main()
else:
with daemon.DaemonContext(pidfile=pid):
server.main()
if __name__ == "__main__":
sys.path.insert(0, '.')
main()