def _create_es_client():
if es_config:
es_client = ElasticSearchService(es_config)
if not es_client.client_ok():
log.error("Unable to create Elasticsearch client instance")
return False
return es_client
return False
class MetaxConsumer():
def __init__(self):
self.log = get_logger(__name__)
self.event_processing_completed = True
self.init_ok = False
# Get configs
# If these raise errors, let consumer init fail
rabbit_settings = get_metax_rabbit_mq_config()
es_settings = get_elasticsearch_config()
is_local_dev = True if os.path.isdir("/etsin/ansible") else False
if not rabbit_settings or not es_settings:
self.log.error("Unable to load RabbitMQ configuration or Elasticsearch configuration")
return
# Set up RabbitMQ connection, channel, exchange and queues
credentials = pika.PlainCredentials(
rabbit_settings['USER'], rabbit_settings['PASSWORD'])
# Try connecting every one minute 30 times
try:
connection = pika.BlockingConnection(
pika.ConnectionParameters(
rabbit_settings['HOST'],
rabbit_settings['PORT'],
rabbit_settings['VHOST'],
credentials,
connection_attempts=30,
retry_delay=60))
except Exception as e:
self.log.error(e)
self.log.error("Unable to open RabbitMQ connection")
return
# Set up ElasticSearch client. In case connection cannot be established, try every 2 seconds for 30 seconds
es_conn_ok = False
i = 0
while not es_conn_ok and i < 15:
self.es_client = ElasticSearchService(es_settings)
if self.es_client.client_ok():
es_conn_ok = True
else:
time.sleep(2)
i += 1
if not es_conn_ok or not self._ensure_index_existence():
return
self.channel = connection.channel()
self.exchange = rabbit_settings['EXCHANGE']
self._set_queue_names(is_local_dev)
self._create_and_bind_queues(is_local_dev)
def callback_create(ch, method, properties, body):
if not self._init_event_callback_ok("create", ch, method):
return
body_as_json = self._get_event_json_body(ch, method, body)
if not body_as_json:
return
self._convert_to_es_doc_and_reindex(ch, method, body_as_json)
def callback_update(ch, method, properties, body):
if not self._init_event_callback_ok("update", ch, method):
return
body_as_json = self._get_event_json_body(ch, method, body)
if not body_as_json:
return
self._convert_to_es_doc_and_reindex(ch, method, body_as_json)
def callback_delete(ch, method, properties, body):
if not self._init_event_callback_ok("delete", ch, method):
return
body_as_json = self._get_event_json_body(ch, method, body)
if not body_as_json:
return
self._delete_from_index(ch, method, body_as_json)
# Set up consumers so that acks are required
self.create_consumer_tag = self.channel.basic_consume(callback_create, queue=self.create_queue, no_ack=False)
self.update_consumer_tag = self.channel.basic_consume(callback_update, queue=self.update_queue, no_ack=False)
self.delete_consumer_tag = self.channel.basic_consume(callback_delete, queue=self.delete_queue, no_ack=False)
self.init_ok = True
def run(self):
self.log.info('RabbitMQ client starting to consume messages..')
print('[*] RabbitMQ is running. To exit press CTRL+C. See logs for indexing details.')
self.channel.start_consuming()
def before_stop(self):
self._cancel_consumers()
def _delete_from_index(self, ch, method, body_as_json):
try:
identifier_to_delete = body_as_json.get('urn_identifier', None)
if not identifier_to_delete:
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
else:
delete_success = self.es_client.delete_dataset(identifier_to_delete)
if delete_success:
ch.basic_ack(delivery_tag=method.delivery_tag)
else:
self.log.error('Failed to delete %s', body_as_json.get('urn_identifier'))
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
except RequestError:
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
finally:
self.event_processing_completed = True
def _convert_to_es_doc_and_reindex(self, ch, method, body_as_json):
if catalog_record_is_deprecated(body_as_json):
self.log.debug("Received identifier {0} for a catalog record that is deprecated. "
"Trying to delete from index if it exists.."
.format(body_as_json['research_dataset'].get('urn_identifier', '')))
self._delete_from_index(ch, method, body_as_json)
self.event_processing_completed = True
ch.basic_ack(delivery_tag=method.delivery_tag)
return
if catalog_record_has_next_version_identifier(body_as_json):
self.log.debug("Received identifier {0} for a catalog record that has a next version {1}. "
"Skipping reindexing..".format(body_as_json['research_dataset'].get('urn_identifier', ''),
body_as_json['next_version'].get('urn_identifier')))
self.event_processing_completed = True
ch.basic_ack(delivery_tag=method.delivery_tag)
return
prev_version_id = get_catalog_record_previous_version_identifier(body_as_json)
converter = CRConverter()
es_data_model = converter.convert_metax_cr_json_to_es_data_model(body_as_json)
if not es_data_model:
self.log.error("Unable to convert metax catalog record to es data model, not requeing message")
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
self.event_processing_completed = True
return
try:
es_reindex_success = \
self.es_client.reindex_dataset(es_data_model) and (prev_version_id is None or self.es_client.delete_dataset(prev_version_id))
if es_reindex_success:
ch.basic_ack(delivery_tag=method.delivery_tag)
else:
self.log.error('Failed to reindex %s', body_as_json.get('research_dataset').get('urn_identifier'))
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
except Exception:
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
finally:
self.event_processing_completed = True
def _init_event_callback_ok(self, callback_type, ch, method):
self.event_processing_completed = False
self.log.debug("Received {0} message from Metax RabbitMQ".format(callback_type))
if not self._ensure_index_existence():
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
self.event_processing_completed = True
return False
return True
def _get_event_json_body(self, ch, method, body):
body_as_json = self._get_message_body_as_json(body)
if not body_as_json:
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
self.event_processing_completed = True
return None
return body_as_json
def _get_message_body_as_json(self, body):
try:
return json.loads(body)
except ValueError:
self.log.error("RabbitMQ message cannot be interpreted as json")
return None
def _cancel_consumers(self):
self.channel.basic_cancel(consumer_tag=self.create_consumer_tag)
self.channel.basic_cancel(consumer_tag=self.update_consumer_tag)
self.channel.basic_cancel(consumer_tag=self.delete_consumer_tag)
def _set_queue_names(self, is_local_dev):
self.create_queue = 'etsin-create'
self.update_queue = 'etsin-update'
self.delete_queue = 'etsin-delete'
if is_local_dev:
# The point of this section is to give unique names to the queues created in local dev env
# This is done to prevent the target rabbitmq server from having multiple consumers consuming the same
# queue (this would result in round-robin type of delivering of messages).
#
# Below, also a time-to-live for a local dev queue is set to automatically delete the queues from the
# target rabbitmq server after a set period of time so as not to make the rabbitmq virtual host to be
# filled with local dev queues. Cf. http://www.rabbitmq.com/ttl.html#queue-ttl
import json
if os.path.isfile('/srv/etsin/rabbitmq_queues.json'):
with open('/srv/etsin/rabbitmq_queues.json') as json_data:
queues = json.load(json_data)
self.create_queue = queues.get('create', None)
self.update_queue = queues.get('update', None)
self.delete_queue = queues.get('delete', None)
else:
import time
timestamp = str(time.time())
self.create_queue += '-' + timestamp
self.update_queue += '-' + timestamp
self.delete_queue += '-' + timestamp
queues = {'create': self.create_queue,
'update': self.update_queue,
'delete': self.delete_queue}
with open('/srv/etsin/rabbitmq_queues.json', 'w') as outfile:
json.dump(queues, outfile)
def _create_and_bind_queues(self, is_local_dev):
args = {}
if is_local_dev:
# Expire local dev created queues after 8 hours of inactivity
args['x-expires'] = 28800000
self.channel.queue_declare(self.create_queue, durable=True, arguments=args)
self.channel.queue_declare(self.update_queue, durable=True, arguments=args)
self.channel.queue_declare(self.delete_queue, durable=True, arguments=args)
self.channel.queue_bind(exchange=self.exchange, queue=self.create_queue, routing_key='create')
self.channel.queue_bind(exchange=self.exchange, queue=self.update_queue, routing_key='update')
self.channel.queue_bind(exchange=self.exchange, queue=self.delete_queue, routing_key='delete')
def _ensure_index_existence(self):
if not self.es_client.index_exists():
if not self.es_client.create_index_and_mapping():
# If there's no ES index, don't create consumer
self.log.error("Unable to create Elasticsearch index and type mapping")
return False
return True