initial commit
This commit is contained in:
Jesse Andrews
249
nova/twistd.py
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249
nova/twistd.py
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright [2010] [Anso Labs, LLC]
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Twisted daemon helpers, specifically to parse out gFlags from twisted flags,
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manage pid files and support syslogging.
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"""
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import logging
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import os
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import signal
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import sys
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import time
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import UserDict
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import logging.handlers
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from nova import vendor
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from twisted.scripts import twistd
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from twisted.python import log
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from twisted.python import reflect
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from twisted.python import runtime
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from twisted.python import usage
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from nova import flags
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if runtime.platformType == "win32":
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from twisted.scripts._twistw import ServerOptions
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else:
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from twisted.scripts._twistd_unix import ServerOptions
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FLAGS = flags.FLAGS
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class TwistdServerOptions(ServerOptions):
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def parseArgs(self, *args):
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return
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def WrapTwistedOptions(wrapped):
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class TwistedOptionsToFlags(wrapped):
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subCommands = None
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def __init__(self):
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# NOTE(termie): _data exists because Twisted stuff expects
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# to be able to set arbitrary things that are
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# not actual flags
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self._data = {}
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self._flagHandlers = {}
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self._paramHandlers = {}
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# Absorb the twistd flags into our FLAGS
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self._absorbFlags()
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self._absorbParameters()
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self._absorbHandlers()
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super(TwistedOptionsToFlags, self).__init__()
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def _absorbFlags(self):
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twistd_flags = []
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reflect.accumulateClassList(self.__class__, 'optFlags', twistd_flags)
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for flag in twistd_flags:
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key = flag[0].replace('-', '_')
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flags.DEFINE_boolean(key, None, str(flag[-1]))
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def _absorbParameters(self):
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twistd_params = []
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reflect.accumulateClassList(self.__class__, 'optParameters', twistd_params)
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for param in twistd_params:
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key = param[0].replace('-', '_')
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flags.DEFINE_string(key, param[2], str(param[-1]))
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def _absorbHandlers(self):
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twistd_handlers = {}
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reflect.addMethodNamesToDict(self.__class__, twistd_handlers, "opt_")
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# NOTE(termie): Much of the following is derived/copied from
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# twisted.python.usage with the express purpose of
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# providing compatibility
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for name in twistd_handlers.keys():
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method = getattr(self, 'opt_'+name)
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takesArg = not usage.flagFunction(method, name)
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doc = getattr(method, '__doc__', None)
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if not doc:
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doc = 'undocumented'
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if not takesArg:
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if name not in FLAGS:
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flags.DEFINE_boolean(name, None, doc)
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self._flagHandlers[name] = method
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else:
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if name not in FLAGS:
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flags.DEFINE_string(name, None, doc)
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self._paramHandlers[name] = method
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def _doHandlers(self):
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for flag, handler in self._flagHandlers.iteritems():
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if self[flag]:
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handler()
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for param, handler in self._paramHandlers.iteritems():
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if self[param] is not None:
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handler(self[param])
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def __str__(self):
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return str(FLAGS)
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def parseOptions(self, options=None):
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if options is None:
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options = sys.argv
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else:
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options.insert(0, '')
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args = FLAGS(options)
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argv = args[1:]
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# ignore subcommands
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try:
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self.parseArgs(*argv)
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except TypeError:
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raise usage.UsageError("Wrong number of arguments.")
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self.postOptions()
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return args
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def parseArgs(self, *args):
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# TODO(termie): figure out a decent way of dealing with args
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#return
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super(TwistedOptionsToFlags, self).parseArgs(*args)
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def postOptions(self):
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self._doHandlers()
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super(TwistedOptionsToFlags, self).postOptions()
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def __getitem__(self, key):
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key = key.replace('-', '_')
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try:
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return getattr(FLAGS, key)
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except (AttributeError, KeyError):
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return self._data[key]
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def __setitem__(self, key, value):
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key = key.replace('-', '_')
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try:
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return setattr(FLAGS, key, value)
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except (AttributeError, KeyError):
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self._data[key] = value
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return TwistedOptionsToFlags
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def stop(pidfile):
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"""
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Stop the daemon
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"""
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# Get the pid from the pidfile
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try:
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pf = file(pidfile,'r')
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pid = int(pf.read().strip())
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pf.close()
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except IOError:
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pid = None
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if not pid:
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message = "pidfile %s does not exist. Daemon not running?\n"
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sys.stderr.write(message % pidfile)
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return # not an error in a restart
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# Try killing the daemon process
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try:
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while 1:
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os.kill(pid, signal.SIGKILL)
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time.sleep(0.1)
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except OSError, err:
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err = str(err)
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if err.find("No such process") > 0:
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if os.path.exists(pidfile):
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os.remove(pidfile)
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else:
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print str(err)
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sys.exit(1)
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def serve(filename):
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logging.debug("Serving %s" % filename)
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name = os.path.basename(filename)
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OptionsClass = WrapTwistedOptions(TwistdServerOptions)
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options = OptionsClass()
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argv = options.parseOptions()
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logging.getLogger('amqplib').setLevel(logging.WARN)
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FLAGS.python = filename
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FLAGS.no_save = True
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if not FLAGS.pidfile:
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FLAGS.pidfile = '%s.pid' % name
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elif FLAGS.pidfile.endswith('twistd.pid'):
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FLAGS.pidfile = FLAGS.pidfile.replace('twistd.pid', '%s.pid' % name)
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if not FLAGS.logfile:
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FLAGS.logfile = '%s.log' % name
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action = 'start'
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if len(argv) > 1:
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action = argv.pop()
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if action == 'stop':
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stop(FLAGS.pidfile)
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sys.exit()
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elif action == 'restart':
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stop(FLAGS.pidfile)
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elif action == 'start':
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pass
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else:
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print 'usage: %s [options] [start|stop|restart]' % argv[0]
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sys.exit(1)
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formatter = logging.Formatter(
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name + '(%(name)s): %(levelname)s %(message)s')
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handler = logging.StreamHandler(log.StdioOnnaStick())
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handler.setFormatter(formatter)
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logging.getLogger().addHandler(handler)
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if FLAGS.verbose:
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logging.getLogger().setLevel(logging.DEBUG)
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else:
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logging.getLogger().setLevel(logging.WARNING)
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if FLAGS.syslog:
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syslog = logging.handlers.SysLogHandler(address='/dev/log')
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syslog.setFormatter(formatter)
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logging.getLogger().addHandler(syslog)
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logging.debug("Full set of FLAGS:")
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for flag in FLAGS:
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logging.debug("%s : %s" % (flag, FLAGS.get(flag, None)))
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twistd.runApp(options)
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