linspectord is now the daemon, not subclassed like before... makes sense because I never need an abstract layer here.
This commit is contained in:
parent
fe2fea6b9d
commit
0e8118a2c0
2 changed files with 114 additions and 136 deletions
|
|
@ -1,129 +0,0 @@
|
||||||
"""
|
|
||||||
This file is part of Linspector (https://linspector.org/)
|
|
||||||
Copyright (c) 2022 Johannes Findeisen <you@hanez.org>. All Rights Reserved.
|
|
||||||
See LICENSE (MIT license)
|
|
||||||
"""
|
|
||||||
import atexit
|
|
||||||
import os
|
|
||||||
import signal
|
|
||||||
import sys
|
|
||||||
import time
|
|
||||||
|
|
||||||
from logging import getLogger
|
|
||||||
|
|
||||||
logger = getLogger('linspector')
|
|
||||||
|
|
||||||
|
|
||||||
class Daemon:
|
|
||||||
# subclass the daemon class and override the run() method.
|
|
||||||
|
|
||||||
def __init__(self, pid_file):
|
|
||||||
self.__pid_file = pid_file
|
|
||||||
|
|
||||||
def daemonize(self):
|
|
||||||
# daemonize the class using the UNIX double fork mechanism.
|
|
||||||
|
|
||||||
# do first fork.
|
|
||||||
try:
|
|
||||||
pid = os.fork()
|
|
||||||
if pid > 0:
|
|
||||||
# exit first parent.
|
|
||||||
sys.exit(0)
|
|
||||||
except OSError as err:
|
|
||||||
logger.error(str('fork #1 failed: {0}'.format(err)))
|
|
||||||
sys.exit(1)
|
|
||||||
|
|
||||||
# decouple from parent environment.
|
|
||||||
os.chdir('/')
|
|
||||||
os.setsid()
|
|
||||||
os.umask(0)
|
|
||||||
|
|
||||||
# do second fork.
|
|
||||||
try:
|
|
||||||
pid = os.fork()
|
|
||||||
if pid > 0:
|
|
||||||
# Exit from second parent.
|
|
||||||
sys.exit(0)
|
|
||||||
except OSError as err:
|
|
||||||
logger.error(str('fork #2 failed: {0}'.format(err)))
|
|
||||||
sys.exit(1)
|
|
||||||
|
|
||||||
# redirect standard file descriptors.
|
|
||||||
sys.stdout.flush()
|
|
||||||
sys.stderr.flush()
|
|
||||||
si = open(os.devnull, 'r')
|
|
||||||
so = open(os.devnull, 'a+')
|
|
||||||
se = open(os.devnull, 'a+')
|
|
||||||
|
|
||||||
os.dup2(si.fileno(), sys.stdin.fileno())
|
|
||||||
os.dup2(so.fileno(), sys.stdout.fileno())
|
|
||||||
os.dup2(se.fileno(), sys.stderr.fileno())
|
|
||||||
|
|
||||||
# write pid file.
|
|
||||||
atexit.register(self.delete_pid)
|
|
||||||
|
|
||||||
pid = str(os.getpid())
|
|
||||||
with open(self.__pid_file, 'w+') as f:
|
|
||||||
f.write(pid + '\n')
|
|
||||||
|
|
||||||
def delete_pid(self):
|
|
||||||
os.remove(self.__pid_file)
|
|
||||||
|
|
||||||
def start(self):
|
|
||||||
# start the daemon. check for a pidfile to see if the daemon already runs before.
|
|
||||||
|
|
||||||
try:
|
|
||||||
with open(self.__pid_file, 'r') as pf:
|
|
||||||
pid = int(pf.read().strip())
|
|
||||||
except IOError:
|
|
||||||
pid = None
|
|
||||||
|
|
||||||
if pid:
|
|
||||||
message = 'pid_file {0} already exist. daemon already running?'
|
|
||||||
logger.error(str(message.format(self.__pid_file)))
|
|
||||||
sys.exit(1)
|
|
||||||
|
|
||||||
# start the daemon.
|
|
||||||
self.daemonize()
|
|
||||||
self.run()
|
|
||||||
|
|
||||||
def stop(self):
|
|
||||||
# stop the daemon.
|
|
||||||
|
|
||||||
# get the pid from the pid file.
|
|
||||||
try:
|
|
||||||
with open(self.__pid_file, 'r') as pf:
|
|
||||||
pid = int(pf.read().strip())
|
|
||||||
except IOError:
|
|
||||||
pid = None
|
|
||||||
|
|
||||||
if not pid:
|
|
||||||
message = 'pid_file {0} does not exist. daemon not running?'
|
|
||||||
logger.error(str(message.format(self.__pid_file)))
|
|
||||||
return # not an error in a restart
|
|
||||||
|
|
||||||
# try killing the daemon process.
|
|
||||||
try:
|
|
||||||
while 1:
|
|
||||||
os.kill(pid, signal.SIGTERM)
|
|
||||||
time.sleep(0.1)
|
|
||||||
except OSError as err:
|
|
||||||
e = str(err.args)
|
|
||||||
if e.find('no such process') > 0:
|
|
||||||
if os.path.exists(self.__pid_file):
|
|
||||||
os.remove(self.__pid_file)
|
|
||||||
else:
|
|
||||||
logger.error(str(err.args))
|
|
||||||
sys.exit(1)
|
|
||||||
|
|
||||||
def restart(self):
|
|
||||||
# restart the daemon.
|
|
||||||
|
|
||||||
self.stop()
|
|
||||||
self.start()
|
|
||||||
|
|
||||||
def run(self):
|
|
||||||
"""
|
|
||||||
you should override this method when you subclass daemon. it will be called after the
|
|
||||||
process has been daemonized by start() or restart().
|
|
||||||
"""
|
|
||||||
|
|
@ -3,20 +3,127 @@ This file is part of Linspector (https://linspector.org/)
|
||||||
Copyright (c) 2022 Johannes Findeisen <you@hanez.org>. All Rights Reserved.
|
Copyright (c) 2022 Johannes Findeisen <you@hanez.org>. All Rights Reserved.
|
||||||
See LICENSE (MIT license)
|
See LICENSE (MIT license)
|
||||||
"""
|
"""
|
||||||
from logging import getLogger
|
import atexit
|
||||||
|
import os
|
||||||
|
import signal
|
||||||
|
import sys
|
||||||
|
import time
|
||||||
|
|
||||||
from linspector.core.daemon import Daemon
|
from logging import getLogger
|
||||||
|
|
||||||
logger = getLogger('linspector')
|
logger = getLogger('linspector')
|
||||||
|
|
||||||
|
|
||||||
class Linspectord(Daemon):
|
class Linspectord:
|
||||||
|
def __init__(self, pid_file, configuration, environment, linspector):
|
||||||
def __init__(self, configuration, environment, linspector):
|
self.__pid_file = pid_file
|
||||||
super().__init__(configuration.get_option('linspector', 'pid_file'))
|
|
||||||
self.__configuration = configuration
|
self.__configuration = configuration
|
||||||
self.__environment = environment
|
self.__environment = environment
|
||||||
self.__linspector = linspector
|
self.__linspector = linspector
|
||||||
|
|
||||||
|
def daemonize(self):
|
||||||
|
# daemonize the class using the UNIX double fork mechanism.
|
||||||
|
|
||||||
|
# do first fork.
|
||||||
|
try:
|
||||||
|
pid = os.fork()
|
||||||
|
if pid > 0:
|
||||||
|
# exit first parent.
|
||||||
|
sys.exit(0)
|
||||||
|
except OSError as err:
|
||||||
|
logger.error(str('fork #1 failed: {0}'.format(err)))
|
||||||
|
sys.exit(1)
|
||||||
|
|
||||||
|
# decouple from parent environment.
|
||||||
|
os.chdir('/')
|
||||||
|
os.setsid()
|
||||||
|
os.umask(0)
|
||||||
|
|
||||||
|
# do second fork.
|
||||||
|
try:
|
||||||
|
pid = os.fork()
|
||||||
|
if pid > 0:
|
||||||
|
# Exit from second parent.
|
||||||
|
sys.exit(0)
|
||||||
|
except OSError as err:
|
||||||
|
logger.error(str('fork #2 failed: {0}'.format(err)))
|
||||||
|
sys.exit(1)
|
||||||
|
|
||||||
|
# redirect standard file descriptors.
|
||||||
|
sys.stdout.flush()
|
||||||
|
sys.stderr.flush()
|
||||||
|
si = open(os.devnull, 'r')
|
||||||
|
so = open(os.devnull, 'a+')
|
||||||
|
se = open(os.devnull, 'a+')
|
||||||
|
|
||||||
|
os.dup2(si.fileno(), sys.stdin.fileno())
|
||||||
|
os.dup2(so.fileno(), sys.stdout.fileno())
|
||||||
|
os.dup2(se.fileno(), sys.stderr.fileno())
|
||||||
|
|
||||||
|
# write pid file.
|
||||||
|
atexit.register(self.delete_pid)
|
||||||
|
|
||||||
|
pid = str(os.getpid())
|
||||||
|
with open(self.__pid_file, 'w+') as f:
|
||||||
|
f.write(pid + '\n')
|
||||||
|
|
||||||
|
def delete_pid(self):
|
||||||
|
os.remove(self.__pid_file)
|
||||||
|
|
||||||
|
def start(self):
|
||||||
|
# start the daemon. check for a pidfile to see if the daemon already runs before.
|
||||||
|
|
||||||
|
try:
|
||||||
|
with open(self.__pid_file, 'r') as pf:
|
||||||
|
pid = int(pf.read().strip())
|
||||||
|
except IOError:
|
||||||
|
pid = None
|
||||||
|
|
||||||
|
if pid:
|
||||||
|
message = 'pid_file {0} already exist. daemon already running?'
|
||||||
|
logger.error(str(message.format(self.__pid_file)))
|
||||||
|
sys.exit(1)
|
||||||
|
|
||||||
|
# start the daemon.
|
||||||
|
self.daemonize()
|
||||||
|
self.run()
|
||||||
|
|
||||||
|
def stop(self):
|
||||||
|
# stop the daemon.
|
||||||
|
|
||||||
|
# get the pid from the pid file.
|
||||||
|
try:
|
||||||
|
with open(self.__pid_file, 'r') as pf:
|
||||||
|
pid = int(pf.read().strip())
|
||||||
|
except IOError:
|
||||||
|
pid = None
|
||||||
|
|
||||||
|
if not pid:
|
||||||
|
message = 'pid_file {0} does not exist. daemon not running?'
|
||||||
|
logger.error(str(message.format(self.__pid_file)))
|
||||||
|
return # not an error in a restart
|
||||||
|
|
||||||
|
# try killing the daemon process.
|
||||||
|
try:
|
||||||
|
while 1:
|
||||||
|
os.kill(pid, signal.SIGTERM)
|
||||||
|
time.sleep(0.1)
|
||||||
|
except OSError as err:
|
||||||
|
e = str(err.args)
|
||||||
|
if e.find('no such process') > 0:
|
||||||
|
if os.path.exists(self.__pid_file):
|
||||||
|
os.remove(self.__pid_file)
|
||||||
|
else:
|
||||||
|
logger.error(str(err.args))
|
||||||
|
sys.exit(1)
|
||||||
|
|
||||||
|
def restart(self):
|
||||||
|
# restart the daemon.
|
||||||
|
|
||||||
|
self.stop()
|
||||||
|
self.start()
|
||||||
|
|
||||||
def run(self):
|
def run(self):
|
||||||
return
|
"""
|
||||||
|
a good place to execute stuff after the process has been daemonized by start() or restart().
|
||||||
|
"""
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue