def start(self):
"""
Load config, daemonize, connect to serial port, listen on socket
"""
opensyslog(ident = self.name, facility = LOG_DAEMON)
self.__load_config()
if self.pidfile_path is not None:
self.daemon_context.pidfile = lockfile.FileLock(self.pidfile_path)
if _pidfile_isbusy(self.daemon_context.pidfile):
logsyslog(LOG_ERR, 'Already running (pidfile is locked)')
closesyslog()
return
if _socket_isbusy(self.socket_path):
logsyslog(LOG_ERR, 'Already running (socket is in use)')
closesyslog()
return
self.daemon_context.open()
with _openfile(self.daemon_context.pidfile.path, 'w',
fail = self.__stop) as file:
file.write('{pid}'.format(pid = os.getpid()))
# opening the serial port here doesn't work
# open it in __run instead
# self.serial_context.open()
logsyslog(LOG_INFO, 'Started')
self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.socket.bind(self.socket_path)
self.socket.listen(1)
logsyslog(LOG_INFO, ('Listening on socket {socket}').format(
socket = self.socket_path))
self.__run()
def __stop(self):
pid = _get_pid(self.daemon_context.pidfile.path)
if pid is None:
return
logsyslog(LOG_INFO, 'Stopping')
os.remove(self.socket.getsockname())
os.remove(self.daemon_context.pidfile.path)
self.socket.close()
if self.serial_context.isOpen():
self.serial_context.close()
self.daemon_context.close()
try:
os.kill(pid, signal.SIGKILL)
except OSError:
logsyslog(LOG_ERR, 'Could not stop process id {pid}'.format(
pid = pid))
closesyslog()