234 lines
8.1 KiB
Python
Executable File
234 lines
8.1 KiB
Python
Executable File
#!/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 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 zuul.cmd
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# No zuul imports here because they pull in paramiko which must not be
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# imported until after the daemonization.
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# https://github.com/paramiko/paramiko/issues/59
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# Similar situation with gear and statsd.
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class Scheduler(zuul.cmd.ZuulApp):
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def __init__(self):
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super(Scheduler, self).__init__()
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self.gear_server_pid = None
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def parse_arguments(self):
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parser = argparse.ArgumentParser(description='Project gating system.')
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parser.add_argument('-c', dest='config',
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help='specify the config 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('-t', dest='validate', action='store_true',
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help='validate config file syntax (Does not'
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'validate config repo validity)')
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parser.add_argument('--version', dest='version', action='version',
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version=self._get_version(),
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help='show zuul version')
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self.args = parser.parse_args()
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def reconfigure_handler(self, signum, frame):
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signal.signal(signal.SIGHUP, signal.SIG_IGN)
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self.log.debug("Reconfiguration triggered")
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self.read_config()
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self.setup_logging('zuul', 'log_config')
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try:
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self.sched.reconfigure(self.config)
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except Exception:
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self.log.exception("Reconfiguration failed:")
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signal.signal(signal.SIGHUP, self.reconfigure_handler)
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def exit_handler(self, signum, frame):
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signal.signal(signal.SIGUSR1, signal.SIG_IGN)
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self.sched.exit()
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self.sched.join()
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self.stop_gear_server()
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def term_handler(self, signum, frame):
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self.stop_gear_server()
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os._exit(0)
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def test_config(self):
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# See comment at top of file about zuul imports
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import zuul.scheduler
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import zuul.executor.client
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logging.basicConfig(level=logging.DEBUG)
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try:
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self.sched = zuul.scheduler.Scheduler(self.config,
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testonly=True)
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except Exception as e:
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self.log.error("%s" % e)
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return -1
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return 0
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def start_gear_server(self):
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pipe_read, pipe_write = os.pipe()
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child_pid = os.fork()
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if child_pid == 0:
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os.close(pipe_write)
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self.setup_logging('gearman_server', 'log_config')
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import zuul.lib.gearserver
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statsd_host = os.environ.get('STATSD_HOST')
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statsd_port = int(os.environ.get('STATSD_PORT', 8125))
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if self.config.has_option('gearman_server', 'listen_address'):
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host = self.config.get('gearman_server', 'listen_address')
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else:
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host = None
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zuul.lib.gearserver.GearServer(4730,
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host=host,
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statsd_host=statsd_host,
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statsd_port=statsd_port,
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statsd_prefix='zuul.geard')
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# Keep running until the parent dies:
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pipe_read = os.fdopen(pipe_read)
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pipe_read.read()
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os._exit(0)
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else:
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os.close(pipe_read)
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self.gear_server_pid = child_pid
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self.gear_pipe_write = pipe_write
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def stop_gear_server(self):
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if self.gear_server_pid:
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os.kill(self.gear_server_pid, signal.SIGKILL)
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def main(self):
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# See comment at top of file about zuul imports
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import zuul.scheduler
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import zuul.executor.client
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import zuul.merger.client
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import zuul.nodepool
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import zuul.webapp
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import zuul.rpclistener
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import zuul.zk
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signal.signal(signal.SIGUSR2, zuul.cmd.stack_dump_handler)
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if (self.config.has_option('gearman_server', 'start') and
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self.config.getboolean('gearman_server', 'start')):
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self.start_gear_server()
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self.setup_logging('zuul', 'log_config')
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self.log = logging.getLogger("zuul.Scheduler")
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self.sched = zuul.scheduler.Scheduler(self.config)
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gearman = zuul.executor.client.LaunchClient(self.config, self.sched)
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merger = zuul.merger.client.MergeClient(self.config, self.sched)
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nodepool = zuul.nodepool.Nodepool(self.sched)
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zookeeper = zuul.zk.ZooKeeper()
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if self.config.has_option('zuul', 'zookeeper_hosts'):
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zookeeper_hosts = self.config.get('zuul', 'zookeeper_hosts')
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else:
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zookeeper_hosts = '127.0.0.1:2181'
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zookeeper.connect(zookeeper_hosts)
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if self.config.has_option('zuul', 'status_expiry'):
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cache_expiry = self.config.getint('zuul', 'status_expiry')
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else:
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cache_expiry = 1
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if self.config.has_option('webapp', 'listen_address'):
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listen_address = self.config.get('webapp', 'listen_address')
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else:
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listen_address = '0.0.0.0'
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if self.config.has_option('webapp', 'port'):
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port = self.config.getint('webapp', 'port')
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else:
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port = 8001
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webapp = zuul.webapp.WebApp(
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self.sched, port=port, cache_expiry=cache_expiry,
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listen_address=listen_address)
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rpc = zuul.rpclistener.RPCListener(self.config, self.sched)
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self.configure_connections()
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self.sched.setExecutor(gearman)
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self.sched.setMerger(merger)
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self.sched.setNodepool(nodepool)
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self.sched.setZooKeeper(zookeeper)
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self.log.info('Starting scheduler')
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try:
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self.sched.start()
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self.sched.registerConnections(self.connections)
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self.sched.reconfigure(self.config)
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self.sched.resume()
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except Exception:
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self.log.exception("Error starting Zuul:")
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# TODO(jeblair): If we had all threads marked as daemon,
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# we might be able to have a nicer way of exiting here.
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sys.exit(1)
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self.log.info('Starting Webapp')
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webapp.start()
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self.log.info('Starting RPC')
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rpc.start()
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signal.signal(signal.SIGHUP, self.reconfigure_handler)
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signal.signal(signal.SIGUSR1, self.exit_handler)
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signal.signal(signal.SIGTERM, self.term_handler)
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while True:
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try:
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signal.pause()
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except KeyboardInterrupt:
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print("Ctrl + C: asking scheduler to exit nicely...\n")
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self.exit_handler(signal.SIGINT, None)
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def main():
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scheduler = Scheduler()
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scheduler.parse_arguments()
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scheduler.read_config()
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if scheduler.args.validate:
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sys.exit(scheduler.test_config())
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if scheduler.config.has_option('zuul', 'pidfile'):
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pid_fn = os.path.expanduser(scheduler.config.get('zuul', 'pidfile'))
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else:
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pid_fn = '/var/run/zuul-scheduler/zuul-scheduler.pid'
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pid = pid_file_module.TimeoutPIDLockFile(pid_fn, 10)
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if scheduler.args.nodaemon:
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scheduler.main()
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else:
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with daemon.DaemonContext(pidfile=pid):
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scheduler.main()
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if __name__ == "__main__":
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sys.path.insert(0, '.')
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main()
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