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# ============LICENSE_START===================================================
# Copyright (C) 2020 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
from mod.subscription 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.
subscription_handler (SubscriptionHandler): The subscription handler instance.
"""
shutdown_signal_received = False
def __init__(self, *, periodic_tasks, subscription_handler):
self.periodic_tasks = periodic_tasks
self.subscription_handler = subscription_handler
def __call__(self, sig_num, frame):
logger.info('Graceful shutdown of PMSH initiated.')
logger.debug(f'ExitHandler was called with signal number: {sig_num}.')
current_sub = self.subscription_handler.current_sub
if current_sub and current_sub.administrativeState == AdministrativeState.UNLOCKED.value:
try:
for thread in self.periodic_tasks:
logger.debug(f'Cancelling periodic task with thread name: {thread.name}.')
thread.cancel()
current_sub.administrativeState = AdministrativeState.LOCKED.value
current_sub.process_subscription(current_sub.get_network_functions(),
self.subscription_handler.mr_pub,
self.subscription_handler.app_conf)
except Exception as e:
logger.error(f'Failed to shut down PMSH application: {e}', exc_info=True)
ExitHandler.shutdown_signal_received = True
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