/usr/share/pyshared/swift/common/daemon.py is in python-swift 1.4.8-0ubuntu2.5.
This file is owned by root:root, with mode 0o644.
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#
# 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 os
import sys
import signal
from re import sub
from swift.common import utils
class Daemon(object):
"""Daemon base class"""
def __init__(self, conf):
self.conf = conf
self.logger = utils.get_logger(conf, log_route='daemon')
def run_once(self, *args, **kwargs):
"""Override this to run the script once"""
raise NotImplementedError('run_once not implemented')
def run_forever(self, *args, **kwargs):
"""Override this to run forever"""
raise NotImplementedError('run_forever not implemented')
def run(self, once=False, **kwargs):
"""Run the daemon"""
utils.validate_configuration()
utils.drop_privileges(self.conf.get('user', 'swift'))
utils.capture_stdio(self.logger, **kwargs)
def kill_children(*args):
signal.signal(signal.SIGTERM, signal.SIG_IGN)
os.killpg(0, signal.SIGTERM)
sys.exit()
signal.signal(signal.SIGTERM, kill_children)
if once:
self.run_once(**kwargs)
else:
self.run_forever(**kwargs)
def run_daemon(klass, conf_file, section_name='', once=False, **kwargs):
"""
Loads settings from conf, then instantiates daemon "klass" and runs the
daemon with the specified once kwarg. The section_name will be derived
from the daemon "klass" if not provided (e.g. ObjectReplicator =>
object-replicator).
:param klass: Class to instantiate, subclass of common.daemon.Daemon
:param conf_file: Path to configuration file
:param section_name: Section name from conf file to load config from
:param once: Passed to daemon run method
"""
# very often the config section_name is based on the class name
# the None singleton will be passed through to readconf as is
if section_name is '':
section_name = sub(r'([a-z])([A-Z])', r'\1-\2',
klass.__name__).lower()
conf = utils.readconf(conf_file, section_name,
log_name=kwargs.get('log_name'))
# once on command line (i.e. daemonize=false) will over-ride config
once = once or \
conf.get('daemonize', 'true').lower() not in utils.TRUE_VALUES
# pre-configure logger
if 'logger' in kwargs:
logger = kwargs.pop('logger')
else:
logger = utils.get_logger(conf, conf.get('log_name', section_name),
log_to_console=kwargs.pop('verbose', False), log_route=section_name)
try:
klass(conf).run(once=once, **kwargs)
except KeyboardInterrupt:
logger.info('User quit')
logger.info('Exited')
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