[PMSH] Refactor subscription processor and policy response handler

Signed-off-by: ERIMROB <robertas.rimkus@est.tech>
Change-Id: I91964848df8f7455169650b138b46d8dfc326b6f
Issue-ID: DCAEGEN2-1820

1 files changed, 59 insertions, 0 deletions

diff --git a/components/pm-subscription-handler/pmsh_service/mod/subscription_handler.py b/components/pm-subscription-handler/pmsh_service/mod/subscription_handler.py
new file mode 100644
index 00000000..a615aa77
--- /dev/null
+++ b/components/pm-subscription-handler/pmsh_service/mod/subscription_handler.py
@@ -0,0 +1,59 @@
+# ============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=====================================================
+
+import mod.aai_client as aai
+import mod.pmsh_logging as logger
+from mod.subscription import AdministrativeState
+
+
+class SubscriptionHandler:
+    def __init__(self, config_handler, administrative_state, mr_pub,
+                 aai_event_thread, app, app_conf):
+        self.config_handler = config_handler
+        self.administrative_state = administrative_state
+        self.mr_pub = mr_pub
+        self.aai_event_thread = aai_event_thread
+        self.app = app
+        self.app_conf = app_conf
+
+    def execute(self):
+        """
+        Checks for changes of administrative state in config and proceeds to process
+        the Subscription if a change has occurred
+        """
+        self.app.app_context().push()
+        config = self.config_handler.get_config()
+        new_administrative_state = config['policy']['subscription']['administrativeState']
+
+        try:
+            if self.administrative_state == new_administrative_state:
+                logger.debug('Administrative State did not change in the Config')
+            else:
+                sub, network_functions = aai.get_pmsh_subscription_data(config)
+                self.administrative_state = new_administrative_state
+                sub.process_subscription(network_functions, self.mr_pub, self.app_conf)
+
+                if new_administrative_state == AdministrativeState.UNLOCKED.value:
+                    logger.debug('Listening to AAI-EVENT topic in MR.')
+                    self.aai_event_thread.start()
+                else:
+                    logger.debug('Stop listening to AAI-EVENT topic in MR.')
+                    self.aai_event_thread.cancel()
+
+        except Exception as err:
+            logger.debug(f'Error occurred during the activation/deactivation process {err}')