250 lines
8.0 KiB
Python
250 lines
8.0 KiB
Python
# 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 argparse
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import daemon
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import errno
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import extras
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import io
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import logging
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import logging.config
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import os
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import signal
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import sys
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import threading
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import traceback
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from nodepool.version import version_info as npd_version_info
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from nodepool import logconfig
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yappi = extras.try_import('yappi')
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objgraph = extras.try_import('objgraph')
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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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def is_pidfile_stale(pidfile):
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""" Determine whether a PID file is stale.
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Return 'True' ("stale") if the contents of the PID file are
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valid but do not match the PID of a currently-running process;
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otherwise return 'False'.
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"""
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result = False
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pidfile_pid = pidfile.read_pid()
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if pidfile_pid is not None:
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try:
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os.kill(pidfile_pid, 0)
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except OSError as exc:
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if exc.errno == errno.ESRCH:
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# The specified PID does not exist
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result = True
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return result
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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 = logging.getLogger("nodepool.stack_dump")
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log.debug("Beginning debug handler")
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try:
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threads = {}
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for t in threading.enumerate():
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threads[t.ident] = t
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log_str = ""
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for thread_id, stack_frame in sys._current_frames().items():
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thread = threads.get(thread_id)
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if thread:
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thread_name = thread.name
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thread_is_daemon = str(thread.daemon)
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else:
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thread_name = '(Unknown)'
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thread_is_daemon = '(Unknown)'
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log_str += "Thread: %s %s d: %s\n"\
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% (thread_id, thread_name, thread_is_daemon)
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log_str += "".join(traceback.format_stack(stack_frame))
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log.debug(log_str)
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except Exception:
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log.exception("Thread dump error:")
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try:
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if yappi:
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if not yappi.is_running():
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log.debug("Starting Yappi")
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yappi.start()
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else:
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log.debug("Stopping Yappi")
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yappi.stop()
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yappi_out = io.StringIO()
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yappi.get_func_stats().print_all(out=yappi_out)
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yappi.get_thread_stats().print_all(out=yappi_out)
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log.debug(yappi_out.getvalue())
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yappi_out.close()
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yappi.clear_stats()
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except Exception:
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log.exception("Yappi error:")
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try:
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if objgraph:
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log.debug("Most common types:")
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objgraph_out = io.StringIO()
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objgraph.show_growth(limit=100, file=objgraph_out)
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log.debug(objgraph_out.getvalue())
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objgraph_out.close()
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except Exception:
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log.exception("Objgraph error:")
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log.debug("End debug handler")
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signal.signal(signal.SIGUSR2, stack_dump_handler)
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class NodepoolApp(object):
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app_name = None
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app_description = 'Node pool.'
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def __init__(self):
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self.parser = None
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self.args = None
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def get_path(self, path):
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if path is None:
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return None
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return os.path.abspath(os.path.expanduser(path))
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def _get_version(self):
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return "Nodepool version: %s" % npd_version_info.release_string()
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def create_parser(self):
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parser = argparse.ArgumentParser(
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description=self.app_description,
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formatter_class=argparse.ArgumentDefaultsHelpFormatter)
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parser.add_argument('-l',
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dest='logconfig',
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help='path to log config file')
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parser.add_argument('--version', dest='version', action='version',
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version=self._get_version(),
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help='show nodepool version')
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return parser
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def parse_args(self):
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self.args = self.parser.parse_args()
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self.logconfig = self.get_path(self.args.logconfig)
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# The arguments debug and foreground both lead to nodaemon mode so
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# set nodaemon if one of them is set.
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if ((hasattr(self.args, 'debug') and self.args.debug) or
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(hasattr(self.args, 'foreground') and self.args.foreground)):
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self.args.nodaemon = True
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else:
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self.args.nodaemon = False
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def setup_logging(self):
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if self.logconfig:
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logging_config = logconfig.load_config(self.logconfig)
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else:
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# If someone runs in the foreground and doesn't give a logging
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# config, leave the config set to emit to stdout.
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if hasattr(self.args, 'nodaemon') and self.args.nodaemon:
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logging_config = logconfig.ServerLoggingConfig()
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if hasattr(self.args, 'debug') and self.args.debug:
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logging_config.setDebug()
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else:
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# Setting a server value updates the defaults to use
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# WatchedFileHandler on /var/log/nodepool/{server}-debug.log
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# and /var/log/nodepool/{server}.log
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logging_config = logconfig.ServerLoggingConfig(
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server=self.app_name)
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logging_config.apply()
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def _main(self, argv=None):
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if argv is None:
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argv = sys.argv[1:]
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self.parser = self.create_parser()
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self.parse_args()
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return self._do_run()
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def _do_run(self):
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# NOTE(jamielennox): setup logging a bit late so it's not done until
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# after a DaemonContext is created.
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self.setup_logging()
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return self.run()
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@classmethod
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def main(cls, argv=None):
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return cls()._main(argv=argv)
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def run(self):
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"""The app's primary function, override it with your logic."""
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raise NotImplementedError()
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class NodepoolDaemonApp(NodepoolApp):
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def create_parser(self):
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parser = super(NodepoolDaemonApp, self).create_parser()
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parser.add_argument('-p',
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dest='pidfile',
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help='path to pid file',
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default='/var/run/nodepool/%s.pid' % self.app_name)
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parser.add_argument('-d',
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dest='debug',
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action='store_true',
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help='do not run as a daemon with debug logging')
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parser.add_argument('-f',
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dest='foreground',
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action='store_true',
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help='do not run as a daemon')
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return parser
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def parse_args(self):
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super().parse_args()
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self.pidfile = self.get_path(self.args.pidfile)
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def _do_run(self):
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if self.args.nodaemon:
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return super(NodepoolDaemonApp, self)._do_run()
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else:
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pid = pid_file_module.TimeoutPIDLockFile(self.pidfile, 10)
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if is_pidfile_stale(pid):
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pid.break_lock()
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# Exercise the pidfile before we do anything else (including
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# logging or daemonizing)
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with pid:
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pass
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with daemon.DaemonContext(pidfile=pid):
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return super(NodepoolDaemonApp, self)._do_run()
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@classmethod
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def main(cls, argv=None):
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signal.signal(signal.SIGUSR2, stack_dump_handler)
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return super(NodepoolDaemonApp, cls).main(argv)
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