213 lines
6.4 KiB
Python
213 lines
6.4 KiB
Python
"""
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Copyright 2015 Hewlett-Packard
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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import logging
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import os
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import signal
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import traceback
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from tempfile import gettempdir
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from time import sleep
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from freezer.lib.pep3143daemon import DaemonContext
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from freezer.lib.pep3143daemon import PidFile
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from freezer.utils import utils
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def setup_logging(log_file):
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class NoLogFilter(logging.Filter):
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def filter(self, record):
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return False
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def configure_logging(file_name):
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expanded_file_name = os.path.expanduser(file_name)
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expanded_dir_name = os.path.dirname(expanded_file_name)
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utils.create_dir(expanded_dir_name, do_log=False)
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logging.basicConfig(
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filename=expanded_file_name,
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level=logging.INFO,
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format=('%(asctime)s %(name)s %(levelname)s %(message)s'))
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# filter out some annoying messages
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# not the best position for this code
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log_filter = NoLogFilter()
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logging.getLogger("apscheduler.scheduler").\
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addFilter(log_filter)
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logging.getLogger("apscheduler.executors.default").\
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addFilter(log_filter)
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logging.getLogger("requests.packages.urllib3.connectionpool").\
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addFilter(log_filter)
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return expanded_file_name
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log_file_paths = [log_file] if log_file else [
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'/var/log/freezer-scheduler.log',
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'~/.freezer/freezer-scheduler.log']
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for file_name in log_file_paths:
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try:
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return configure_logging(file_name)
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except IOError:
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pass
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raise Exception("Unable to write to log file")
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class NoDaemon(object):
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"""
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A class which shares the same interface as the Daemon class,
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but is used to execute the scheduler as a foreground process
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"""
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instance = None
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exit_flag = False
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def __init__(self, daemonizable):
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# daemonizable has to provide start/stop (and possibly reload) methods
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NoDaemon.instance = self
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self.daemonizable = daemonizable
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# register signal handlers
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for (signal_number, handler) in self.signal_map.items():
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signal.signal(signal_number, handler)
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@property
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def signal_map(self):
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return {
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signal.SIGTERM: NoDaemon.handle_program_exit,
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signal.SIGINT: NoDaemon.handle_program_exit,
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signal.SIGHUP: NoDaemon.handle_reload,
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}
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@staticmethod
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def handle_program_exit(signum, frame):
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logging.info('[*] Got signal {0}. Exiting ...'.format(signum))
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NoDaemon.exit_flag = True
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NoDaemon.instance.daemonizable.stop()
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@staticmethod
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def handle_reload(signum, frame):
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NoDaemon.instance.daemonizable.reload()
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def start(self, log_file=None, dump_stack_trace=False):
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setup_logging(log_file)
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while not NoDaemon.exit_flag:
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try:
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logging.info('[*] Starting in no-daemon mode')
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self.daemonizable.start()
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NoDaemon.exit_flag = True
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except Exception as e:
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if dump_stack_trace:
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logging.error(traceback.format_exc(e))
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logging.error('[*] Restarting procedure in no-daemon mode '
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'after Fatal Error: {0}'.format(e))
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sleep(10)
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logging.info('[*] Done exiting')
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def stop(self):
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pass
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def status(self):
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pass
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class Daemon(object):
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"""
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A class to manage all the daemon-related stuff
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"""
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instance = None
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exit_flag = False
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def __init__(self, daemonizable=None, pid_fname=None):
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# daemonizable has to provide start/stop (and possibly reload) methods
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Daemon.instance = self
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self._pid_fname = pid_fname
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self.daemonizable = daemonizable
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@staticmethod
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def handle_program_exit(signum, frame):
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Daemon.exit_flag = True
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Daemon.instance.daemonizable.stop()
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@staticmethod
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def handle_reload(signum, frame):
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Daemon.instance.daemonizable.reload()
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@property
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def signal_map(self):
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return {
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signal.SIGTERM: Daemon.handle_program_exit,
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signal.SIGHUP: Daemon.handle_reload,
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}
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@property
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def pid_fname(self):
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if not self._pid_fname:
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fname = '{0}/freezer_sched_{1}.pid'.format(
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gettempdir(),
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os.path.split(os.path.expanduser('~'))[-1])
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self._pid_fname = os.path.normpath(fname)
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return self._pid_fname
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@property
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def pid(self):
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if os.path.isfile(self.pid_fname):
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with open(self.pid_fname, 'r') as f:
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return int(f.read())
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return None
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def start(self, log_file=None, dump_stack_trace=False):
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pidfile = PidFile(self.pid_fname)
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with DaemonContext(pidfile=pidfile, signal_map=self.signal_map):
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setup_logging(log_file)
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while not Daemon.exit_flag:
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try:
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logging.info('[*] freezer daemon starting, pid: {0}'.
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format(self.pid))
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self.daemonizable.start()
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Daemon.exit_flag = True
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except Exception as e:
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if dump_stack_trace:
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logging.error(traceback.format_exc(e))
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logging.error('[*] Restarting daemonized procedure '
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'after Fatal Error: {0}'.format(e))
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sleep(10)
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logging.info('[*] freezer daemon done, pid: {0}'.format(self.pid))
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def stop(self):
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pid = self.pid
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if pid:
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os.kill(self.pid, signal.SIGTERM)
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else:
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print ('Not Running')
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def status(self):
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pid = self.pid
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if pid:
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print ('Running with pid: {0}'.format(pid))
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else:
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print ('Not Running')
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def reload(self):
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pid = self.pid
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if pid:
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os.kill(pid, signal.SIGHUP)
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else:
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print ('Not Running')
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