5d27af4079
Change migrates the monasca-api to use oslo-config-generator in order to always build newest configuration file. That removes the need of maintaning the file along with changes to oslo configuration. The example of the file is also included in the documentation. Also: * ported case for launching api under WSGI and allowing the argument parsing of oslo to take place Story: 2000970 Task: 4865 Story: 2000964 Task: 4106 Change-Id: I57547b0e2122e40f58db5f949773900b76214526
99 lines
3.5 KiB
Python
99 lines
3.5 KiB
Python
# Copyright 2017 FUJITSU LIMITED
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# (C) Copyright 2017 Hewlett Packard Enterprise Development LP
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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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import requests
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from oslo_config import cfg
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from oslo_log import log
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from oslo_utils import importutils
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from monasca_api.common.repositories import exceptions
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from monasca_api.healthcheck import base
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LOG = log.getLogger(__name__)
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CONF = cfg.CONF
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class MetricsDbCheck(base.BaseHealthCheck):
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"""Evaluates metrics db health
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Healthcheck what type of database is used (InfluxDB, Cassandra)
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and provide health according to the given db.
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Healthcheck for InfluxDB verifies if:
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* check the db status by the /ping endpoint.
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Healthcheck for the Cassandra verifies if:
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* Cassandra is up and running (it is possible to create new connection)
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* keyspace exists
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If following conditions are met health check return healthy status.
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Otherwise unhealthy status is returned with explanation.
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"""
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def __init__(self):
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# Try to import cassandra. Not a problem if it can't be imported as long
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# as the metrics db is influx
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self._cluster = importutils.try_import('cassandra.cluster', None)
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metric_driver = CONF.repositories.metrics_driver
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self._db = self._detected_database_type(metric_driver)
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if self._db == 'cassandra' and self._cluster is None:
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# Should not happen, but log if it does somehow
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LOG.error("Metrics Database is Cassandra but cassandra.cluster"
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"not importable. Unable to do health check")
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def health_check(self):
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if self._db == 'influxdb':
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status = self._check_influxdb_status()
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else:
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status = self._check_cassandra_status()
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return base.CheckResult(healthy=status[0],
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message=status[1])
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def _detected_database_type(self, driver):
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if 'influxdb' in driver:
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return 'influxdb'
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elif 'cassandra' in driver:
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return 'cassandra'
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else:
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raise exceptions.UnsupportedDriverException(
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'Driver {0} is not supported by Healthcheck'.format(driver))
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def _check_influxdb_status(self):
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uri = 'http://{0}:{1}/ping'.format(CONF.influxdb.ip_address,
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CONF.influxdb.port)
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try:
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resp = requests.head(url=uri)
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except Exception as ex:
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LOG.exception(str(ex))
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return False, str(ex)
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return resp.ok, 'OK' if resp.ok else 'Error: {0}'.format(
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resp.status_code)
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def _check_cassandra_status(self):
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if self._cluster is None:
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return False, "Cassandra driver not imported"
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try:
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cassandra = self._cluster.Cluster(
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CONF.cassandra.cluster_ip_addresses
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)
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session = cassandra.connect(CONF.cassandra.keyspace)
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session.shutdown()
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except Exception as ex:
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LOG.exception(str(ex))
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return False, str(ex)
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return True, 'OK'
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