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