def start_daemon(pidfile, process, stdout=None, stderr=None, **kwargs):
if pidfile:
pidfile = PIDLockFile(pidfile)
try:
pidfile.acquire(timeout=1.0)
pidfile.release()
except LockFailed:
raise
else:
pidfile = None
stdout = stdout or sys.stdout
stderr = stderr or sys.stderr
with DaemonContext(pidfile=pidfile, stdout=stdout, stderr=stderr, **kwargs):
process.start()
# TaskManager instance.
tm = TaskManager(mongo, max_tasks=max_tasks, scan_interval=scan_interval)
return tm
lock = PIDLockFile('pet.pid')
if lock.is_locked() and not lock.i_am_locking():
if not psutil.pid_exists(lock.read_pid()):
print 'The pidlock is hold by a void process. Breaking it.'
lock.break_lock()
else:
print 'Another process is holding pidlock. Exit.'
exit()
print 'Acquiring pidlock.'
lock.acquire(timeout=5)
# TODO Load config.
mongo = MongoDataAdapter.create_adapter('GatesPet')
max_tasks = 50
scan_interval = 10
process_interval = 120
tm = create_task_manager(mongo, max_tasks, scan_interval)
# Fix tasks that previous instance did not proceed.
mongo.fix_tasks()
# Main loop
tm.start()