def cmd_start(self):
"""
Starts the daemon for ``app``
The method :meth:`app.before_start()` is called prior to actually daemonizing;
the method can abort the process by raising ...
The method :meth:`app.before_start()` need not to exist (a validity check is performed).
"""
if self.pidfile.is_locked():
pidfile_path = self.pidfile.path
if PIDFileHelper.pidfile_lock_is_stale(self.pidfile):
self.pidfile.break_lock()
else:
##EXCEPTION##
self._raise("PID file already locked",
'error_pidfile_locked', {'path':self.pidfile.path})
# BEFORE START
# ============
abort = self._tryBeforeStart()
if abort:
self._raise("daemon aborted by 'before_start'",
'error_daemon_aborted', {'cause':'BeforeStart application method'})
# START!!!
# ========
try:
self.context.open()
except Exception,e:
##EXCEPTION##
self._raise("daemon error whilst opening",
'error_daemon_open', {'exc':e})
def _configPIDFile(self):
"""
Configures the PID File
"""
prefix = self._secureGetFromApp('pidfile_pathprefix',
self._default_pid_filepath_prefix)
# the forward slash / also works under windows
# so we can skip os.path.join
pidfile_path = prefix.rstrip('/') + "/" + self.app.name
self.pidfile = PIDFileHelper.make_pidlockfile(pidfile_path)
self.context.pidfile = self.pidfile
def cmd_stop(self):
"""
Stops the daemon for (the currently running) ``app`` but not before calling ``app.stop``
"""
if not self.pidfile.is_locked():
pidfile_path = self.pidfile.path
##EXCEPTION##
self._raise("PID file not locked / not present",
'error_pidfile_not_locked', {'path':pidfile_path})
if PIDFileHelper.pidfile_lock_is_stale(self.pidfile):
self.pidfile.break_lock()
else:
pid = self.pidfile.read_pid()
try:
os.kill(pid, signal.SIGTERM)
except OSError, exc:
##EXCEPTION##
self._raise("daemon termination fault",
'error_daemon_terminate_process', {'pid':pid})
