Load Balancing as a Service (LBaaS) for OpenStack
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# Copyright 2020 Red Hat, Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import datetime
from oslo_config import cfg
from oslo_middleware.healthcheck import pluginbase
from octavia.db import api as db_apis
from octavia.db import healthcheck
CONF = cfg.CONF
class OctaviaDBHealthcheck(pluginbase.HealthcheckBaseExtension):
UNAVAILABLE_REASON = 'The Octavia database is unavailable.'
last_check = None
last_result = None
last_message = None
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
def healthcheck(self, server_port):
try:
if (self.last_check is not None and
((datetime.datetime.now() -
self.last_check).total_seconds()) <
CONF.api_settings.healthcheck_refresh_interval):
result = self.last_result
message = self.last_message
else:
result, message = healthcheck.check_database_connection(
db_apis.get_session())
self.last_check = datetime.datetime.now()
self.last_result = result
self.last_message = message
if result:
return OctaviaDBCheckResult(available=True, reason="OK")
else:
return OctaviaDBCheckResult(available=False,
reason=self.UNAVAILABLE_REASON,
details=message)
except Exception as e:
return OctaviaDBCheckResult(available=False,
reason=self.UNAVAILABLE_REASON,
details=str(e))
class OctaviaDBCheckResult(pluginbase.HealthcheckResult):
"""Result sub-class to provide a unique name in detail reports."""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)