linspectord is now the daemon, not subclassed like before... makes sense because I never need an abstract layer here.
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0e8118a2c0
2 changed files with 114 additions and 136 deletions
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@ -1,129 +0,0 @@
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"""
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This file is part of Linspector (https://linspector.org/)
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Copyright (c) 2022 Johannes Findeisen <you@hanez.org>. All Rights Reserved.
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See LICENSE (MIT license)
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"""
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import atexit
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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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from logging import getLogger
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logger = getLogger('linspector')
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class Daemon:
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# subclass the daemon class and override the run() method.
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def __init__(self, pid_file):
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self.__pid_file = pid_file
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def daemonize(self):
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# daemonize the class using the UNIX double fork mechanism.
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# do first fork.
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try:
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pid = os.fork()
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if pid > 0:
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# exit first parent.
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sys.exit(0)
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except OSError as err:
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logger.error(str('fork #1 failed: {0}'.format(err)))
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sys.exit(1)
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# decouple from parent environment.
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os.chdir('/')
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os.setsid()
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os.umask(0)
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# do second fork.
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try:
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pid = os.fork()
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if pid > 0:
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# Exit from second parent.
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sys.exit(0)
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except OSError as err:
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logger.error(str('fork #2 failed: {0}'.format(err)))
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sys.exit(1)
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# redirect standard file descriptors.
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sys.stdout.flush()
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sys.stderr.flush()
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si = open(os.devnull, 'r')
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so = open(os.devnull, 'a+')
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se = open(os.devnull, 'a+')
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os.dup2(si.fileno(), sys.stdin.fileno())
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os.dup2(so.fileno(), sys.stdout.fileno())
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os.dup2(se.fileno(), sys.stderr.fileno())
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# write pid file.
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atexit.register(self.delete_pid)
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pid = str(os.getpid())
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with open(self.__pid_file, 'w+') as f:
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f.write(pid + '\n')
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def delete_pid(self):
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os.remove(self.__pid_file)
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def start(self):
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# start the daemon. check for a pidfile to see if the daemon already runs before.
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try:
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with open(self.__pid_file, 'r') as pf:
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pid = int(pf.read().strip())
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except IOError:
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pid = None
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if pid:
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message = 'pid_file {0} already exist. daemon already running?'
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logger.error(str(message.format(self.__pid_file)))
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sys.exit(1)
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# start the daemon.
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self.daemonize()
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self.run()
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def stop(self):
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# stop the daemon.
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# get the pid from the pid file.
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try:
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with open(self.__pid_file, 'r') as pf:
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pid = int(pf.read().strip())
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except IOError:
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pid = None
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if not pid:
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message = 'pid_file {0} does not exist. daemon not running?'
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logger.error(str(message.format(self.__pid_file)))
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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.SIGTERM)
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time.sleep(0.1)
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except OSError as err:
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e = str(err.args)
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if e.find('no such process') > 0:
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if os.path.exists(self.__pid_file):
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os.remove(self.__pid_file)
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else:
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logger.error(str(err.args))
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sys.exit(1)
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def restart(self):
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# restart the daemon.
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self.stop()
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self.start()
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def run(self):
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"""
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you should override this method when you subclass daemon. it will be called after the
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process has been daemonized by start() or restart().
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"""
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@ -3,20 +3,127 @@ This file is part of Linspector (https://linspector.org/)
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Copyright (c) 2022 Johannes Findeisen <you@hanez.org>. All Rights Reserved.
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See LICENSE (MIT license)
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"""
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from logging import getLogger
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import atexit
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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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from linspector.core.daemon import Daemon
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from logging import getLogger
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logger = getLogger('linspector')
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class Linspectord(Daemon):
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def __init__(self, configuration, environment, linspector):
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super().__init__(configuration.get_option('linspector', 'pid_file'))
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class Linspectord:
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def __init__(self, pid_file, configuration, environment, linspector):
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self.__pid_file = pid_file
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self.__configuration = configuration
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self.__environment = environment
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self.__linspector = linspector
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def daemonize(self):
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# daemonize the class using the UNIX double fork mechanism.
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# do first fork.
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try:
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pid = os.fork()
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if pid > 0:
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# exit first parent.
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sys.exit(0)
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except OSError as err:
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logger.error(str('fork #1 failed: {0}'.format(err)))
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sys.exit(1)
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# decouple from parent environment.
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os.chdir('/')
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os.setsid()
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os.umask(0)
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# do second fork.
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try:
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pid = os.fork()
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if pid > 0:
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# Exit from second parent.
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sys.exit(0)
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except OSError as err:
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logger.error(str('fork #2 failed: {0}'.format(err)))
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sys.exit(1)
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# redirect standard file descriptors.
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sys.stdout.flush()
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sys.stderr.flush()
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si = open(os.devnull, 'r')
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so = open(os.devnull, 'a+')
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se = open(os.devnull, 'a+')
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os.dup2(si.fileno(), sys.stdin.fileno())
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os.dup2(so.fileno(), sys.stdout.fileno())
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os.dup2(se.fileno(), sys.stderr.fileno())
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# write pid file.
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atexit.register(self.delete_pid)
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pid = str(os.getpid())
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with open(self.__pid_file, 'w+') as f:
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f.write(pid + '\n')
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def delete_pid(self):
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os.remove(self.__pid_file)
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def start(self):
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# start the daemon. check for a pidfile to see if the daemon already runs before.
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try:
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with open(self.__pid_file, 'r') as pf:
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pid = int(pf.read().strip())
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except IOError:
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pid = None
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if pid:
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message = 'pid_file {0} already exist. daemon already running?'
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logger.error(str(message.format(self.__pid_file)))
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sys.exit(1)
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# start the daemon.
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self.daemonize()
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self.run()
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def stop(self):
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# stop the daemon.
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# get the pid from the pid file.
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try:
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with open(self.__pid_file, 'r') as pf:
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pid = int(pf.read().strip())
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except IOError:
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pid = None
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if not pid:
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message = 'pid_file {0} does not exist. daemon not running?'
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logger.error(str(message.format(self.__pid_file)))
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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.SIGTERM)
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time.sleep(0.1)
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except OSError as err:
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e = str(err.args)
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if e.find('no such process') > 0:
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if os.path.exists(self.__pid_file):
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os.remove(self.__pid_file)
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else:
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logger.error(str(err.args))
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sys.exit(1)
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def restart(self):
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# restart the daemon.
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self.stop()
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self.start()
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def run(self):
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return
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"""
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a good place to execute stuff after the process has been daemonized by start() or restart().
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"""
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