def launch(self, alive_time = None, enable_gui = True):
'''
Launch the threaded application
@param alive_time msec for live app, normally used by test. Default None for ignore
@param enable_gui launch the program loading the GUI if True
'''
if hasattr(self, 'p'):
self.p.destroy()
del self.p
# Cleanup any state set by the FreeStationApp.
#
import signal #@Reimport
#if signal.__dict__.has_key('SIGHUP'):
# signal.signal(signal.SIGHUP, signal.SIG_DFL)
#if signal.__dict__.has_key('SIGBREAK'):
# signal.signal(signal.SIGBREAK, signal.SIG_DFL) #@UndefinedVariable
signal.signal(signal.SIGINT, signal.SIG_DFL)
signal.signal(signal.SIGTERM, signal.SIG_DFL)
import os
if os.path.exists('webkit.lock'):
os.remove('webkit.lock')
self.p = None
self.p = FreeStationApp(alive_time, enable_gui)
self.p.setName(self.PROCESS_MONITORED_NAME + '-' + str(time()))
self.threads.append(self.p)
self.p.start()
def run():
import os
if os.path.exists('webkit.lock'):
os.remove('webkit.lock')
import time
from freestationapp import FreeStationApp
app = FreeStationApp(3, True)
app.setName('FreeStation' + '-' + str(time.time()))
app.start()
app.run()
class Watchdog(object):
MONITOR_TIME = 1
PROCESS_MONITORED_NAME = 'FreeStation'
def __init__(self):
'''
Init the watchdog
'''
LOG.debug('Parent PID: {0}'.format(getppid()))
LOG.debug('Watchdog PID: {0}'.format(getpid()))
signal(SIGTERM, self.handler)
self.play = True
self.threads = []
def handler(self, signal, object): #@ReservedAssignment
'''
Catch SIGTERM signal and destroy the app if alive
'''
if hasattr(self, 'p'):
if self.p and self.p.is_alive():
self.p.on_destroy(None, None)
LOG.debug('Exiting by interrupt. Bye')
# This shows: Exception SystemExit: 0 in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
# But it is only closing with nice exit. SystemExit when it is not handled, the Python interpreter exits
sys.exit(0)
def launch(self, alive_time = None, enable_gui = True):
'''
Launch the threaded application
@param alive_time msec for live app, normally used by test. Default None for ignore
@param enable_gui launch the program loading the GUI if True
'''
if hasattr(self, 'p'):
self.p.destroy()
del self.p
# Cleanup any state set by the FreeStationApp.
#
import signal #@Reimport
#if signal.__dict__.has_key('SIGHUP'):
# signal.signal(signal.SIGHUP, signal.SIG_DFL)
#if signal.__dict__.has_key('SIGBREAK'):
# signal.signal(signal.SIGBREAK, signal.SIG_DFL) #@UndefinedVariable
signal.signal(signal.SIGINT, signal.SIG_DFL)
signal.signal(signal.SIGTERM, signal.SIG_DFL)
import os
if os.path.exists('webkit.lock'):
os.remove('webkit.lock')
self.p = None
self.p = FreeStationApp(alive_time, enable_gui)
self.p.setName(self.PROCESS_MONITORED_NAME + '-' + str(time()))
self.threads.append(self.p)
self.p.start()
def monitor(self, alive_time = None, enable_gui = True, executions = None):
'''
Check if the app is alive, and restart if the app dead
'''
while(self.play):
LOG.debug('Sleeping {0} seconds'.format(str(self.MONITOR_TIME)))
sleep(self.MONITOR_TIME)
if not hasattr(self, 'p'):
self.launch(alive_time, enable_gui)
LOG.debug('Checking if alive...')
#print (self.threads)
if(self.p.is_alive() == False):
self.p.on_destroy(None, None)
# Join all threads using a timeout so it doesn't block
# Filter out threads which have been joined or are None
self.threads = [t.join(1) for t in self.threads if t is not None and t.isAlive()]
LOG.error('Restarting process ...')
self.launch(alive_time, enable_gui)
if executions:
executions -= 1
if executions <= 0:
self.exit()
else:
LOG.debug('Process still running: {0}'.format(self.p.getName()))
self.p.join(timeout=1.0)
def stop(self):
self.play = False
def exit(self): #@ReservedAssignment
'''
Send a SIGTERM himself
'''
kill(getpid(), SIGTERM)
