154 lines
5.0 KiB
Python
154 lines
5.0 KiB
Python
#!/usr/bin/env python
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# Copyright 2012 Hewlett-Packard Development Company, L.P.
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# Copyright 2013-2014 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 ConfigParser
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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 logging.config
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import os
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import sys
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import signal
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import traceback
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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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def stack_dump_handler(signum, frame):
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signal.signal(signal.SIGUSR2, signal.SIG_IGN)
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log_str = ""
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for thread_id, stack_frame in sys._current_frames().items():
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log_str += "Thread: %s\n" % thread_id
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log_str += "".join(traceback.format_stack(stack_frame))
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log = logging.getLogger("zuul.stack_dump")
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log.debug(log_str)
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signal.signal(signal.SIGUSR2, stack_dump_handler)
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class Merger(object):
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def __init__(self):
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self.args = None
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self.config = None
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def parse_arguments(self):
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parser = argparse.ArgumentParser(description='Zuul merge worker.')
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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('--version', dest='version', action='store_true',
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help='show zuul version')
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self.args = parser.parse_args()
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def read_config(self):
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self.config = ConfigParser.ConfigParser()
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if self.args.config:
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locations = [self.args.config]
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else:
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locations = ['/etc/zuul/zuul.conf',
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'~/zuul.conf']
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for fp in locations:
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if os.path.exists(os.path.expanduser(fp)):
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self.config.read(os.path.expanduser(fp))
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return
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raise Exception("Unable to locate config file in %s" % locations)
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def setup_logging(self, section, parameter):
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if self.config.has_option(section, parameter):
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fp = os.path.expanduser(self.config.get(section, parameter))
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if not os.path.exists(fp):
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raise Exception("Unable to read logging config file at %s" %
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fp)
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logging.config.fileConfig(fp)
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else:
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logging.basicConfig(level=logging.DEBUG)
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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.merger.stop()
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self.merger.join()
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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.merger.server
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self.setup_logging('merger', 'log_config')
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self.merger = zuul.merger.server.MergeServer(self.config)
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self.merger.start()
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signal.signal(signal.SIGUSR1, self.exit_handler)
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signal.signal(signal.SIGUSR2, stack_dump_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 merger to exit nicely...\n"
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self.exit_handler(signal.SIGINT, None)
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def main():
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server = Merger()
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server.parse_arguments()
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if server.args.version:
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from zuul.version import version_info as zuul_version_info
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print "Zuul version: %s" % zuul_version_info.version_string()
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sys.exit(0)
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server.read_config()
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if server.config.has_option('zuul', 'state_dir'):
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state_dir = os.path.expanduser(server.config.get('zuul', 'state_dir'))
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else:
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state_dir = '/var/lib/zuul'
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test_fn = os.path.join(state_dir, 'test')
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try:
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f = open(test_fn, 'w')
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f.close()
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os.unlink(test_fn)
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except Exception:
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print
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print "Unable to write to state directory: %s" % state_dir
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print
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raise
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if server.config.has_option('merger', 'pidfile'):
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pid_fn = os.path.expanduser(server.config.get('merger', 'pidfile'))
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else:
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pid_fn = '/var/run/zuul-merger/zuul-merger.pid'
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pid = pid_file_module.TimeoutPIDLockFile(pid_fn, 10)
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if server.args.nodaemon:
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server.main()
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else:
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with daemon.DaemonContext(pidfile=pid):
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server.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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