def _kill_process(self, box_configuration, process_name):
""" method is called to kill a running process """
try:
self.logger.info('kill: %s {' % process_name)
pid = box_configuration.get_process_pid(process_name)
if pid is not None and psutil.pid_exists(int(pid)):
p = psutil.Process(pid)
p.kill()
p.wait()
box_configuration.set_process_pid(process_name, None)
helper.update_configuration(self.logger, box_configuration)
ProcessContext.remove_pid_file(process_name)
except Exception:
self.logger.error('Exception on killing: %s' % process_name, exc_info=True)
finally:
self.logger.info('}')
def _start_process(self, box_configuration, process_name):
try:
self.logger.info('start: %s {' % process_name)
p = psutil.Popen([get_python(), PROJECT_ROOT + '/' + PROCESS_STARTER, process_name],
close_fds=True,
cwd=settings['process_cwd'],
stdin=PIPE,
stdout=PIPE,
stderr=STDOUT)
box_configuration.set_process_pid(process_name, p.pid)
self.logger.info('Started %s with pid = %r' % (process_name, p.pid))
except Exception:
box_configuration.set_process_pid(process_name, None)
self.logger.error('Exception on starting: %s' % process_name, exc_info=True)
finally:
helper.update_configuration(self.logger, box_configuration)
self.logger.info('}')
def _poll_process(self, box_configuration, process_name):
""" between killing a process and its actual termination lies poorly documented requirement -
<purging process' io pipes and reading exit status>.
this can be done either by os.wait() or process.wait() """
try:
pid = box_configuration.get_process_pid(process_name)
p = psutil.Process(pid)
returncode = p.wait(timeout=0.01)
if returncode is None:
# process is already terminated
self.logger.info('Process %s is terminated' % process_name)
return
else:
# process is terminated; possibly by OS
box_configuration.set_process_pid(process_name, None)
helper.update_configuration(self.logger, box_configuration)
self.logger.info('Process %s got terminated. Cleaning up' % process_name)
except TimeoutExpired:
# process is alive and OK
pass
except Exception:
self.logger.error('Exception on polling: %s' % process_name, exc_info=True)
