Handle graceful exit of PMSH1.0.2

Issue-ID: DCAEGEN2-1832
Change-Id: If0362e1927f7013d25f0cf23ade5ce9d2bdea8e3
Signed-off-by: emartin <ephraim.martin@est.tech>

1 files changed, 48 insertions, 0 deletions

diff --git a/components/pm-subscription-handler/pmsh_service/mod/exit_handler.py b/components/pm-subscription-handler/pmsh_service/mod/exit_handler.py
new file mode 100755
index 00000000..adc4941c
--- /dev/null
+++ b/components/pm-subscription-handler/pmsh_service/mod/exit_handler.py
@@ -0,0 +1,48 @@
+# ============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.pmsh_utils 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.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:
+            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(self.subscription_handler.current_nfs,
+                                             self.subscription_handler.mr_pub,
+                                             self.subscription_handler.app_conf)
+        ExitHandler.shutdown_signal_received = True