203 lines
7.0 KiB
Python
Executable File
203 lines
7.0 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 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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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.scheduler
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import zuul.zk
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from zuul.lib.config import get_default
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from zuul.lib.statsd import get_statsd_config
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class Scheduler(zuul.cmd.ZuulDaemonApp):
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app_name = 'scheduler'
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app_description = 'The main zuul process.'
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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 createParser(self):
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parser = super(Scheduler, self).createParser()
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parser.add_argument('command',
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choices=zuul.scheduler.COMMANDS,
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nargs='?')
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return parser
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def parseArguments(self, args=None):
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super(Scheduler, self).parseArguments()
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if self.args.command:
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self.args.nodaemon = True
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def fullReconfigure(self):
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self.log.debug("Reconfiguration triggered")
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self.readConfig()
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self.setup_logging('scheduler', '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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def smartReconfigure(self):
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self.log.debug("Smart reconfiguration triggered")
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self.readConfig()
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self.setup_logging('scheduler', 'log_config')
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try:
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self.sched.reconfigure(self.config, smart=True)
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except Exception:
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self.log.exception("Reconfiguration failed:")
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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.fullReconfigure()
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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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self.sched.exit()
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self.sched.join()
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self.stop_gear_server()
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sys.exit(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 gear
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(statsd_host, statsd_port, statsd_prefix) = get_statsd_config(
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self.config)
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if statsd_prefix:
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statsd_prefix += '.zuul.geard'
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else:
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statsd_prefix = 'zuul.geard'
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host = get_default(self.config, 'gearman_server', 'listen_address')
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port = int(get_default(self.config, 'gearman_server', 'port',
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4730))
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ssl_key = get_default(self.config, 'gearman_server', 'ssl_key')
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ssl_cert = get_default(self.config, 'gearman_server', 'ssl_cert')
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ssl_ca = get_default(self.config, 'gearman_server', 'ssl_ca')
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gear.Server(port,
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ssl_key=ssl_key,
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ssl_cert=ssl_cert,
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ssl_ca=ssl_ca,
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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=statsd_prefix,
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keepalive=True,
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tcp_keepidle=300,
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tcp_keepintvl=60,
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tcp_keepcnt=5)
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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 run(self):
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if self.args.command in zuul.scheduler.COMMANDS:
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self.send_command(self.args.command)
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sys.exit(0)
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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('scheduler', '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.ExecutorClient(self.config, self.sched)
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self.sched.setZuulApp(self)
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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(enable_cache=True)
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zookeeper_hosts = get_default(self.config, 'zookeeper', 'hosts', None)
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if not zookeeper_hosts:
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raise Exception("The zookeeper hosts config value is required")
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zookeeper_tls_key = get_default(self.config, 'zookeeper', 'tls_key')
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zookeeper_tls_cert = get_default(self.config, 'zookeeper', 'tls_cert')
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zookeeper_tls_ca = get_default(self.config, 'zookeeper', 'tls_ca')
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zookeeper_timeout = float(get_default(self.config, 'zookeeper',
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'session_timeout', 10.0))
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zookeeper.connect(
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zookeeper_hosts,
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timeout=zookeeper_timeout,
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tls_cert=zookeeper_tls_cert,
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tls_key=zookeeper_tls_key,
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tls_ca=zookeeper_tls_ca)
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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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self.sched.stop()
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sys.exit(1)
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signal.signal(signal.SIGHUP, self.reconfigure_handler)
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if self.args.nodaemon:
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signal.signal(signal.SIGTERM, self.exit_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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else:
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self.sched.join()
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def main():
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Scheduler().main()
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if __name__ == "__main__":
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main()
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