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# ============LICENSE_START===================================================
# Copyright (C) 2020-2022 Nordix Foundation.
# ============================================================================
# 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.
#
# SPDX-License-Identifier: Apache-2.0
# ============LICENSE_END=====================================================
from mod import logger, db
from mod.api.services import subscription_service, measurement_group_service
from mod.api.services.measurement_group_service import AdministrativeState
class ExitHandler:
""" Handles PMSH graceful exit when a SIGTERM signal is received.
Args:
periodic_tasks (List[PeriodicTask]): PeriodicTasks that needs to be cancelled.
"""
shutdown_signal_received = False
def __init__(self, *, periodic_tasks):
self.periodic_tasks = periodic_tasks
def __call__(self, sig_num, frame):
logger.info('Graceful shutdown of PMSH initiated.')
logger.debug(f'ExitHandler was called with signal number: {sig_num}.')
try:
subscriptions_all = subscription_service.query_all_subscriptions()
for subscription in subscriptions_all:
for mg in subscription.measurement_groups:
if mg.administrative_state == AdministrativeState.UNLOCKED.value:
measurement_group_service.\
update_admin_status(mg, AdministrativeState.LOCKED.value)
except Exception as e:
logger.error(f'Failed to shut down PMSH application: {e}', exc_info=True)
for thread in self.periodic_tasks:
logger.info(f'Cancelling thread {thread.name}')
thread.cancel()
logger.info('Closing all DB connections')
db.session.bind.dispose()
db.session.close()
db.engine.dispose()
ExitHandler.shutdown_signal_received = True
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