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Member "monasca-api-3.1.0/monasca_api/healthcheck/alarms_db_check.py" (27 Sep 2019, 1665 Bytes) of package /linux/misc/openstack/monasca-api-3.1.0.tar.gz:


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    1 # Copyright 2017 FUJITSU LIMITED
    2 #
    3 # Licensed under the Apache License, Version 2.0 (the "License"); you may
    4 # not use this file except in compliance with the License. You may obtain
    5 # a copy of the License at
    6 #
    7 #      http://www.apache.org/licenses/LICENSE-2.0
    8 #
    9 # Unless required by applicable law or agreed to in writing, software
   10 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   11 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   12 # License for the specific language governing permissions and limitations
   13 # under the License.
   14 
   15 from oslo_log import log
   16 from sqlalchemy import text
   17 
   18 from monasca_api.common.repositories.sqla import sql_repository
   19 from monasca_api.healthcheck import base
   20 
   21 LOG = log.getLogger(__name__)
   22 
   23 
   24 class AlarmsDbHealthCheck(base.BaseHealthCheck,
   25                           sql_repository.SQLRepository):
   26     """Evaluates alarm db health
   27 
   28     Healthcheck verifies if:
   29     * database is up and running, it is possible to establish connection
   30     * sample sql query can be executed
   31 
   32     If following conditions are met health check return healthy status.
   33     Otherwise unhealthy status is returned with explanation.
   34     """
   35 
   36     def health_check(self):
   37         status = self.check_db_status()
   38         return base.CheckResult(healthy=status[0],
   39                                 message=status[1])
   40 
   41     def check_db_status(self):
   42         try:
   43             with self._db_engine.connect() as con:
   44                 query = text('SELECT 1')
   45                 con.execute(query)
   46         except Exception as ex:
   47             LOG.exception(str(ex))
   48             return False, str(ex)
   49         return True, 'OK'