80 lines
2.5 KiB
Python
80 lines
2.5 KiB
Python
# Copyright 2017 FUJITSU LIMITED
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_config import cfg
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from oslo_log import log
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from six import PY3
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from monasca_api.healthcheck import base
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from monasca_common.kafka_lib import client
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LOG = log.getLogger(__name__)
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CONF = cfg.CONF
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class KafkaHealthCheck(base.BaseHealthCheck):
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"""Evaluates kafka health
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Healthcheck verifies if:
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* kafka server is up and running
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* there is a configured topic in kafka
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If following conditions are met health check returns healthy status.
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Otherwise unhealthy status is returned with message.
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Note:
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Healthcheck checks 3 type of topics given in configuration:
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metrics_topic, events_topic and alarm_state_transition_topic.
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"""
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def health_check(self):
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url = CONF.kafka.uri
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try:
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kafka_client = client.KafkaClient(hosts=url)
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except client.KafkaUnavailableError as ex:
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LOG.error(repr(ex))
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error_str = 'Could not connect to Kafka at {0}'.format(url)
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return base.CheckResult(healthy=False, message=error_str)
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status = self._verify_topics(kafka_client)
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self._disconnect_gracefully(kafka_client)
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return base.CheckResult(healthy=status[0],
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message=status[1])
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@staticmethod
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def _verify_topics(kafka_client):
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topics = (CONF.kafka.metrics_topic,
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CONF.kafka.events_topic,
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CONF.kafka.alarm_state_transitions_topic)
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if PY3:
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topics = tuple(topic.encode('utf-8') for topic in topics)
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for topic in topics:
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topic_exists = topic in kafka_client.topics
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if not topic_exists:
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error_str = 'Kafka: Topic {0} not found'.format(topic)
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LOG.error(error_str)
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return False, str(error_str)
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return True, 'OK'
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@staticmethod
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def _disconnect_gracefully(kafka_client):
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try:
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kafka_client.close()
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except Exception:
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LOG.exception('Closing Kafka Connection')
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