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# Copyright (c) 2013 OpenStack Foundation
# 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.
from oslo_log import log as logging
from trove.common import cfg
from trove.common import utils
from trove.guestagent.common import operating_system
from trove.guestagent.datastore.experimental.postgresql.service.status import (
PgSqlAppStatus)
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
PGSQL_SERVICE_CANDIDATES = ("postgresql",)
class PgSqlProcess(object):
"""Mixin that manages the PgSql process."""
def start_db(self, context):
self._enable_pgsql_on_boot()
"""Start the PgSql service."""
cmd = operating_system.service_discovery(PGSQL_SERVICE_CANDIDATES)
LOG.info(
_("{guest_id}: Starting database engine with command ({command}).")
.format(
guest_id=CONF.guest_id,
command=cmd['cmd_start'],
)
)
utils.execute_with_timeout(
*cmd['cmd_start'].split(),
timeout=30
)
def _enable_pgsql_on_boot(self):
try:
pgsql_service = operating_system.service_discovery(
PGSQL_SERVICE_CANDIDATES)
utils.execute_with_timeout(pgsql_service['cmd_enable'],
shell=True)
except KeyError:
LOG.exception(_("Error enabling PostgreSQL start on boot."))
raise RuntimeError("Service is not discovered.")
def _disable_pgsql_on_boot(self):
try:
pgsql_service = operating_system.service_discovery(
PGSQL_SERVICE_CANDIDATES)
utils.execute_with_timeout(pgsql_service['cmd_disable'],
shell=True)
except KeyError:
LOG.exception(_("Error disabling PostgreSQL start on boot."))
raise RuntimeError("Service is not discovered.")
def stop_db(self, context, do_not_start_on_reboot=False):
"""Stop the PgSql service."""
if do_not_start_on_reboot:
self._disable_pgsql_on_boot()
cmd = operating_system.service_discovery(PGSQL_SERVICE_CANDIDATES)
LOG.info(
_("{guest_id}: Stopping database engine with command ({command}).")
.format(
guest_id=CONF.guest_id,
command=cmd['cmd_stop'],
)
)
utils.execute_with_timeout(
*cmd['cmd_stop'].split(),
timeout=30
)
def restart(self, context):
"""Restart the PgSql service."""
LOG.info(
_("{guest_id}: Restarting database engine.").format(
guest_id=CONF.guest_id,
)
)
try:
PgSqlAppStatus.get().begin_restart()
self.stop_db(context)
self.start_db(context)
finally:
PgSqlAppStatus.get().end_install_or_restart()
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