def _StartWorkerProcess(self, process_name):
"""Creates, starts, monitors and registers a worker process.
Args:
process_name (str): process name.
Returns:
MultiProcessWorkerProcess: extraction worker process or None on error.
"""
analysis_plugin = self._analysis_plugins.get(process_name, None)
if not analysis_plugin:
logger.error('Missing analysis plugin: {0:s}'.format(process_name))
return None
queue_name = '{0:s} output event queue'.format(process_name)
output_event_queue = zeromq_queue.ZeroMQPushBindQueue(
name=queue_name, timeout_seconds=self._QUEUE_TIMEOUT)
# Open the queue so it can bind to a random port, and we can get the
# port number to use in the input queue.
output_event_queue.Open()
self._event_queues[process_name] = output_event_queue
queue_name = '{0:s} input event queue'.format(process_name)
input_event_queue = zeromq_queue.ZeroMQPullConnectQueue(
name=queue_name,
delay_open=True,
port=output_event_queue.port,
timeout_seconds=self._QUEUE_TIMEOUT)
process = analysis_process.AnalysisProcess(
input_event_queue,
self._knowledge_base,
self._session,
analysis_plugin,
self._processing_configuration,
data_location=self._data_location,
event_filter_expression=self._event_filter_expression,
name=process_name)
process.start()
logger.info('Started analysis plugin: {0:s} (PID: {1:d}).'.format(
process_name, process.pid))
try:
self._StartMonitoringProcess(process)
except (IOError, KeyError) as exception:
logger.error(
('Unable to monitor analysis plugin: {0:s} (PID: {1:d}) '
'with error: {2!s}').format(process_name, process.pid,
exception))
process.terminate()
return None
self._RegisterProcess(process)
return process
def _StartAnalysisProcesses(self, analysis_plugins):
"""Starts the analysis processes.
Args:
analysis_plugins (dict[str, AnalysisPlugin]): analysis plugins that
should be run and their names.
"""
logger.info('Starting analysis plugins.')
for analysis_plugin in analysis_plugins.values():
self._analysis_plugins[analysis_plugin.NAME] = analysis_plugin
process = self._StartWorkerProcess(analysis_plugin.NAME)
if not process:
logger.error('Unable to create analysis process: {0:s}'.format(
analysis_plugin.NAME))
logger.info('Analysis plugins running')
def _CheckStatusWorkerProcess(self, pid):
"""Checks the status of a worker process.
If a worker process is not responding the process is terminated and
a replacement process is started.
Args:
pid (int): process ID (PID) of a registered worker process.
Raises:
KeyError: if the process is not registered with the engine.
"""
# TODO: Refactor this method, simplify and separate concerns (monitoring
# vs management).
self._RaiseIfNotRegistered(pid)
process = self._processes_per_pid[pid]
process_status = self._QueryProcessStatus(process)
if process_status is None:
process_is_alive = False
else:
process_is_alive = True
process_information = self._process_information_per_pid[pid]
used_memory = process_information.GetUsedMemory() or 0
if self._worker_memory_limit and used_memory > self._worker_memory_limit:
logger.warning((
'Process: {0:s} (PID: {1:d}) killed because it exceeded the '
'memory limit: {2:d}.').format(
process.name, pid, self._worker_memory_limit))
self._KillProcess(pid)
if isinstance(process_status, dict):
self._rpc_errors_per_pid[pid] = 0
status_indicator = process_status.get('processing_status', None)
else:
rpc_errors = self._rpc_errors_per_pid.get(pid, 0) + 1
self._rpc_errors_per_pid[pid] = rpc_errors
if rpc_errors > self._MAXIMUM_RPC_ERRORS:
process_is_alive = False
if process_is_alive:
rpc_port = process.rpc_port.value
logger.warning((
'Unable to retrieve process: {0:s} (PID: {1:d}) status via '
'RPC socket: http://localhost:{2:d}').format(
process.name, pid, rpc_port))
processing_status_string = 'RPC error'
status_indicator = definitions.STATUS_INDICATOR_RUNNING
else:
processing_status_string = 'killed'
status_indicator = definitions.STATUS_INDICATOR_KILLED
process_status = {
'processing_status': processing_status_string}
self._UpdateProcessingStatus(pid, process_status, used_memory)
# _UpdateProcessingStatus can also change the status of the worker,
# So refresh the status if applicable.
for worker_status in self._processing_status.workers_status:
if worker_status.pid == pid:
status_indicator = worker_status.status
break
if status_indicator in definitions.ERROR_STATUS_INDICATORS:
logger.error((
'Process {0:s} (PID: {1:d}) is not functioning correctly. '
'Status code: {2!s}.').format(process.name, pid, status_indicator))
self._TerminateProcessByPid(pid)
replacement_process = None
for replacement_process_attempt in range(
self._MAXIMUM_REPLACEMENT_RETRIES):
logger.info((
'Attempt: {0:d} to start replacement worker process for '
'{1:s}').format(replacement_process_attempt + 1, process.name))
replacement_process = self._StartWorkerProcess(process.name)
if replacement_process:
break
time.sleep(self._REPLACEMENT_WORKER_RETRY_DELAY)
if not replacement_process:
logger.error(
'Unable to create replacement worker process for: {0:s}'.format(
process.name))