79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
# Copyright (c) 2014 OpenStack Foundation
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# All Rights Reserved.
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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 os
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from oslo_log import log as logging
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from trove.common import exception
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from trove.common import instance
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from trove.common import utils
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from trove.guestagent.datastore.experimental.postgresql import pgutil
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from trove.guestagent.datastore import service
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LOG = logging.getLogger(__name__)
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PGSQL_PID = "'/var/run/postgresql/postgresql.pid'"
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class PgSqlAppStatus(service.BaseDbStatus):
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@classmethod
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def get(cls):
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if not cls._instance:
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cls._instance = PgSqlAppStatus()
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return cls._instance
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def _get_actual_db_status(self):
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"""Checks the acutal PgSql process to determine status.
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Status will be one of the following:
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- RUNNING
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The process is running and responsive.
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- BLOCKED
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The process is running but unresponsive.
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- CRASHED
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The process is not running, but should be or the process
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is running and should not be.
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- SHUTDOWN
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The process was gracefully shut down.
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"""
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# Run a simple scalar query to make sure the process is responsive.
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try:
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pgutil.execute('psql', '-c', 'SELECT 1')
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except utils.Timeout:
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return instance.ServiceStatuses.BLOCKED
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except exception.ProcessExecutionError:
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try:
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utils.execute_with_timeout(
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"/bin/ps", "-C", "postgres", "h"
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)
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except exception.ProcessExecutionError:
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if os.path.exists(PGSQL_PID):
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return instance.ServiceStatuses.CRASHED
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return instance.ServiceStatuses.SHUTDOWN
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else:
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return instance.ServiceStatuses.BLOCKED
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else:
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return instance.ServiceStatuses.RUNNING
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