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#!/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 logging
import os
import sys
import signal
import zuul.cmd
from zuul.lib.config import get_default
from zuul.lib.statsd import get_statsd_config
import zuul.scheduler
# 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.ZuulDaemonApp):
app_name = 'scheduler'
app_description = 'The main zuul process.'
def __init__(self):
super(Scheduler, self).__init__()
self.gear_server_pid = None
def createParser(self):
parser = super(Scheduler, self).createParser()
parser.add_argument('command',
choices=zuul.scheduler.COMMANDS,
nargs='?')
return parser
def parseArguments(self, args=None):
super(Scheduler, self).parseArguments()
if self.args.command:
self.args.nodaemon = True
def reconfigure_handler(self, signum, frame):
signal.signal(signal.SIGHUP, signal.SIG_IGN)
self.log.debug("Reconfiguration triggered")
self.readConfig()
self.setup_logging('scheduler', '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):
self.sched.exit()
self.sched.join()
self.stop_gear_server()
sys.exit(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, statsd_port, statsd_prefix) = get_statsd_config(
self.config)
if statsd_prefix:
statsd_prefix += '.zuul.geard'
else:
statsd_prefix = 'zuul.geard'
host = get_default(self.config, 'gearman_server', 'listen_address')
port = int(get_default(self.config, 'gearman_server', 'port',
4730))
ssl_key = get_default(self.config, 'gearman_server', 'ssl_key')
ssl_cert = get_default(self.config, 'gearman_server', 'ssl_cert')
ssl_ca = get_default(self.config, 'gearman_server', 'ssl_ca')
zuul.lib.gearserver.GearServer(port,
ssl_key=ssl_key,
ssl_cert=ssl_cert,
ssl_ca=ssl_ca,
host=host,
statsd_host=statsd_host,
statsd_port=statsd_port,
statsd_prefix=statsd_prefix)
# 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 run(self):
# See comment at top of file about zuul imports
import zuul.scheduler
if self.args.command in zuul.scheduler.COMMANDS:
self.send_command(self.args.command)
sys.exit(0)
# See comment at top of file about zuul imports
import zuul.executor.client
import zuul.merger.client
import zuul.nodepool
import zuul.webapp
import zuul.zk
if (self.config.has_option('gearman_server', 'start') and
self.config.getboolean('gearman_server', 'start')):
self.start_gear_server()
self.setup_logging('scheduler', '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()
zookeeper_hosts = get_default(self.config, 'zookeeper',
'hosts', '127.0.0.1:2181')
zookeeper_timeout = float(get_default(self.config, 'zookeeper',
'session_timeout', 10.0))
zookeeper.connect(zookeeper_hosts, timeout=zookeeper_timeout)
cache_expiry = get_default(self.config, 'webapp', 'status_expiry', 1)
listen_address = get_default(self.config, 'webapp', 'listen_address',
'0.0.0.0')
port = get_default(self.config, 'webapp', 'port', 8001)
webapp = zuul.webapp.WebApp(
self.sched, port=port, cache_expiry=cache_expiry,
listen_address=listen_address)
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, webapp)
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()
signal.signal(signal.SIGHUP, self.reconfigure_handler)
if self.args.nodaemon:
signal.signal(signal.SIGTERM, self.exit_handler)
while True:
try:
signal.pause()
except KeyboardInterrupt:
print("Ctrl + C: asking scheduler to exit nicely...\n")
self.exit_handler(signal.SIGINT, None)
else:
self.sched.join()
def main():
Scheduler().main()
if __name__ == "__main__":
main()
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