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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=====================================================
import json
from mod import logger
from mod.network_function import NetworkFunction
from mod.subscription import Subscription, AdministrativeState, subscription_nf_states
policy_response_handle_functions = {
AdministrativeState.LOCKED.value: {
'success': NetworkFunction.delete,
'failed': Subscription.update_sub_nf_status
},
AdministrativeState.UNLOCKED.value: {
'success': Subscription.update_sub_nf_status,
'failed': Subscription.update_sub_nf_status
}
}
class PolicyResponseHandler:
def __init__(self, mr_sub, app_conf, app):
self.mr_sub = mr_sub
self.app_conf = app_conf
self.app = app
def poll_policy_topic(self):
"""
This method polls MR for response from policy. It checks whether the message is for the
relevant subscription and then handles the response
"""
self.app.app_context().push()
administrative_state = self.app_conf.subscription.administrativeState
logger.info('Polling MR for XNF activation/deactivation policy response events.')
try:
response_data = self.mr_sub.get_from_topic('dcae_pmsh_policy_cl_input')
for data in response_data:
data = json.loads(data)
if data['status']['subscriptionName'] \
== self.app_conf.subscription.subscriptionName:
nf_name = data['status']['nfName']
response_message = data['status']['message']
self._handle_response(self.app_conf.subscription.subscriptionName,
administrative_state, nf_name, response_message)
except Exception as err:
logger.error(f'Error trying to poll policy response topic on MR: {err}', exc_info=True)
@staticmethod
def _handle_response(subscription_name, administrative_state, nf_name, response_message):
"""
Handles the response from Policy, updating the DB
Args:
subscription_name (str): The subscription name
administrative_state (str): The administrative state of the subscription
nf_name (str): The network function name
response_message (str): The message in the response regarding the state (success|failed)
"""
logger.info(f'Response from MR: Sub: {subscription_name} for '
f'NF: {nf_name} received, updating the DB')
try:
sub_nf_status = subscription_nf_states[administrative_state][response_message].value
policy_response_handle_functions[administrative_state][response_message](
subscription_name=subscription_name, status=sub_nf_status, nf_name=nf_name)
except Exception as err:
logger.error(f'Error changing nf_sub status in the DB: {err}')
raise
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