The Gatekeeper, or a project gating system
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zuul/zuul/cmd/scheduler.py

233 lines
8.1 KiB

#!/usr/bin/env python
# Copyright 2012 Hewlett-Packard Development Company, L.P.
# Copyright 2013 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 Scheduler(zuul.cmd.ZuulApp):
def __init__(self):
super(Scheduler, self).__init__()
self.gear_server_pid = None
def parse_arguments(self):
parser = argparse.ArgumentParser(description='Project gating system.')
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('-t', dest='validate', action='store_true',
help='validate config file syntax (Does not'
'validate config repo validity)')
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('zuul', 'log_config')
try:
self.sched.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.sched.exit()
self.sched.join()
self.stop_gear_server()
def term_handler(self, signum, frame):
self.stop_gear_server()
os._exit(0)
def test_config(self):
# See comment at top of file about zuul imports
import zuul.scheduler
import zuul.executor.client
logging.basicConfig(level=logging.DEBUG)
try:
self.sched = zuul.scheduler.Scheduler(self.config,
testonly=True)
except Exception as e:
self.log.error("%s" % e)
return -1
return 0
def start_gear_server(self):
pipe_read, pipe_write = os.pipe()
child_pid = os.fork()
if child_pid == 0:
os.close(pipe_write)
self.setup_logging('gearman_server', 'log_config')
import zuul.lib.gearserver
statsd_host = os.environ.get('STATSD_HOST')
statsd_port = int(os.environ.get('STATSD_PORT', 8125))
if self.config.has_option('gearman_server', 'listen_address'):
host = self.config.get('gearman_server', 'listen_address')
else:
host = None
zuul.lib.gearserver.GearServer(4730,
host=host,
statsd_host=statsd_host,
statsd_port=statsd_port,
statsd_prefix='zuul.geard')
# Keep running until the parent dies:
pipe_read = os.fdopen(pipe_read)
pipe_read.read()
os._exit(0)
else:
os.close(pipe_read)
self.gear_server_pid = child_pid
self.gear_pipe_write = pipe_write
def stop_gear_server(self):
if self.gear_server_pid:
os.kill(self.gear_server_pid, signal.SIGKILL)
def main(self):
# See comment at top of file about zuul imports
import zuul.scheduler
import zuul.executor.client
import zuul.merger.client
import zuul.nodepool
import zuul.webapp
import zuul.rpclistener
import zuul.zk
signal.signal(signal.SIGUSR2, zuul.cmd.stack_dump_handler)
if (self.config.has_option('gearman_server', 'start') and
self.config.getboolean('gearman_server', 'start')):
self.start_gear_server()
self.setup_logging('zuul', 'log_config')
self.log = logging.getLogger("zuul.Scheduler")
self.sched = zuul.scheduler.Scheduler(self.config)
gearman = zuul.executor.client.ExecutorClient(self.config, self.sched)
merger = zuul.merger.client.MergeClient(self.config, self.sched)
nodepool = zuul.nodepool.Nodepool(self.sched)
zookeeper = zuul.zk.ZooKeeper()
if self.config.has_option('zuul', 'zookeeper_hosts'):
zookeeper_hosts = self.config.get('zuul', 'zookeeper_hosts')
else:
zookeeper_hosts = '127.0.0.1:2181'
zookeeper.connect(zookeeper_hosts)
if self.config.has_option('zuul', 'status_expiry'):
cache_expiry = self.config.getint('zuul', 'status_expiry')
else:
cache_expiry = 1
if self.config.has_option('webapp', 'listen_address'):
listen_address = self.config.get('webapp', 'listen_address')
else:
listen_address = '0.0.0.0'
if self.config.has_option('webapp', 'port'):
port = self.config.getint('webapp', 'port')
else:
port = 8001
webapp = zuul.webapp.WebApp(
self.sched, port=port, cache_expiry=cache_expiry,
listen_address=listen_address)
rpc = zuul.rpclistener.RPCListener(self.config, self.sched)
self.configure_connections()
self.sched.setExecutor(gearman)
self.sched.setMerger(merger)
self.sched.setNodepool(nodepool)
self.sched.setZooKeeper(zookeeper)
self.log.info('Starting scheduler')
try:
self.sched.start()
self.sched.registerConnections(self.connections)
self.sched.reconfigure(self.config)
self.sched.resume()
except Exception:
self.log.exception("Error starting Zuul:")
# TODO(jeblair): If we had all threads marked as daemon,
# we might be able to have a nicer way of exiting here.
sys.exit(1)
self.log.info('Starting Webapp')
webapp.start()
self.log.info('Starting RPC')
rpc.start()
signal.signal(signal.SIGHUP, self.reconfigure_handler)
signal.signal(signal.SIGUSR1, self.exit_handler)
signal.signal(signal.SIGTERM, self.term_handler)
while True:
try:
signal.pause()
except KeyboardInterrupt:
print("Ctrl + C: asking scheduler to exit nicely...\n")
self.exit_handler(signal.SIGINT, None)
def main():
scheduler = Scheduler()
scheduler.parse_arguments()
scheduler.read_config()
if scheduler.args.validate:
sys.exit(scheduler.test_config())
if scheduler.config.has_option('zuul', 'pidfile'):
pid_fn = os.path.expanduser(scheduler.config.get('zuul', 'pidfile'))
else:
pid_fn = '/var/run/zuul-scheduler/zuul-scheduler.pid'
pid = pid_file_module.TimeoutPIDLockFile(pid_fn, 10)
if scheduler.args.nodaemon:
scheduler.main()
else:
with daemon.DaemonContext(pidfile=pid):
scheduler.main()
if __name__ == "__main__":
sys.path.insert(0, '.')
main()