def setUp(self):
self.logger = alert_handler.AlertHandler(
project_id=None,
write_to_logging=True,
write_to_error_reporting=False,
write_to_email=False)
self.handler = job_status_handler.JobStatusHandler(
"unused", "unused", "unused", self.logger)
def run_main(event, context):
project_id = google.auth.default()[1]
logger = alert_handler.AlertHandler(project_id)
# Retrieve pubsub messages for all the tests that have been kicked off by
# the test runner.
subscriber = pubsub_v1.SubscriberClient()
project = subscriber.project_path(project_id)
subscription = None
for s in subscriber.list_subscriptions(project):
if s.topic.split('/')[-1] == METRICS_WRITTEN_TOPIC:
subscription = s.name
break
if not subscription:
subscription_id = subscriber.subscription_path(
project_id, 'metrics-handler-subscription')
topic = subscriber.topic_path(project_id, METRICS_WRITTEN_TOPIC)
subscription = subscriber.create_subscription(
subscription_id, topic, ack_deadline_seconds=300).name
try:
all_msgs = subscriber.pull(subscription, 100).received_messages
except google.api_core.exceptions.DeadlineExceeded:
logger.info(
'No messages found for subscription: {}'.format(subscription))
return
# Group messages by test. Each test might have made multiple attempts and
# therefore could have multiple messages.
test_name_to_msgs = collections.defaultdict(list)
ids_to_ack = []
for msg in all_msgs:
data_str = msg.message.data
try:
message_id = msg.message.message_id
logger.info('Found message_id: {}'.format(message_id))
data = json.loads(data_str)
data['publish_time'] = msg.message.publish_time.seconds
data['ack_id'] = msg.ack_id
data['message_id'] = message_id
test_name_to_msgs[data['test_name']].append(data)
except Exception as e:
logger.error(
'Metrics handler encountered an invalid message in pubsub queue '
'for topic `{}` which led to Exception: {}. This message will '
'be acknowledged and ignored. The message was: {}'.format(
METRICS_WRITTEN_TOPIC, e, msg))
ids_to_ack.append(msg.ack_id)
# Grab the latest message for each test. We will process only that message
# and all other messages for that test will be ack'ed without being processed.
msgs_to_process = []
for test_name, msgs in test_name_to_msgs.items():
sorted_msgs = sorted(msgs, key = lambda x: x['publish_time'])
ids_to_ack.extend([msg['ack_id'] for msg in msgs[:-1]])
msgs_to_process.append(msgs[-1])
logger.info('Finished deduplicating messages from test runs.')
# Note: it's good to ack early and often since pubsub will resend messages
# that are not ack'ed within the queue's deadline.
if ids_to_ack:
logger.info('Will ack these ids: {}'.format(ids_to_ack))
subscriber.acknowledge(subscription, ids_to_ack)
logger.info('Successful ack for ids: {}'.format(ids_to_ack))
if not msgs_to_process:
logger.info('No messages to process. Stopping early.')
return
# TODO: Add support for multi-zone and/or multi-cluster setups.
zone = msgs_to_process[0].get('zone')
cluster = msgs_to_process[0].get('cluster_name')
status_handler = job_status_handler.JobStatusHandler(
project_id, zone, cluster, logger)
# Handle the metrics for each test. Ack if the process was successful or if
# the message is permanently invalid. Do not ack if the test is still running
# so that we will retry again later once that test has finished running.
for msg in msgs_to_process:
try:
logger.info('Pubsub message to process: {}'.format(msg))
should_ack = _process_pubsub_message(msg, status_handler, logger)
except Exception:
logger.error(
'Encountered exception while attempting to process message {}. '
'The message will be acknowledged to prevent more crashes. '
'Exception: {}'.format(msg, traceback.format_exc()))
should_ack = True
if should_ack:
logger.info('Finished processing message. Will ack')
subscriber.acknowledge(subscription, [msg['ack_id']])
logger.info('Acknowledged ack_id: {}'.format(msg['ack_id']))
else:
logger.info('Finished processing message. Will not ack')
logger.info('Processed a message for each of the following tests: '
'{}'.format([x['test_name'] for x in msgs_to_process]))
logger.send_email()