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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=====================================================
import json
from mod.pmsh_config import MRTopic, AppConfig
from mod import logger
from mod.subscription import AdministrativeState, subscription_nf_states
from mod.api.db_models import MeasurementGroupModel
from mod.api.services import measurement_group_service
policy_response_handle_functions = {
AdministrativeState.LOCKED.value: {
'success': measurement_group_service.delete_nf_to_measurement_group,
'failed': measurement_group_service.update_measurement_group_nf_status
},
AdministrativeState.UNLOCKED.value: {
'success': measurement_group_service.update_measurement_group_nf_status,
'failed': measurement_group_service.update_measurement_group_nf_status
},
AdministrativeState.LOCKING.value: {
'success': measurement_group_service.lock_nf_to_meas_grp,
'failed': measurement_group_service.update_measurement_group_nf_status
}
}
class PolicyResponseHandler:
def __init__(self, app):
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()
logger.info('Polling MR for XNF activation/deactivation policy response events.')
try:
response_data = AppConfig.get_instance(). \
get_from_topic(MRTopic.POLICY_PM_SUBSCRIBER.value, 'dcae_pmsh_policy_cl_input')
for data in response_data:
data = json.loads(data)
measurement_group_name = data['status']['measurementGroupName']
subscription_name = data['status']['subscriptionName']
measurement_group = (MeasurementGroupModel.query.filter(
MeasurementGroupModel.measurement_group_name == measurement_group_name,
subscription_name == MeasurementGroupModel
.subscription_name).one_or_none())
nf_name = data['status']['nfName']
response_message = data['status']['message']
if measurement_group:
self._handle_response(measurement_group_name,
measurement_group.administrative_state,
nf_name, response_message)
else:
logger.info(f'Polled MR response provides missing measurement '
f'group name : {measurement_group_name}')
except Exception as err:
logger.error(f'Error trying to poll policy response topic on MR: {err}', exc_info=True)
@staticmethod
def _handle_response(measurement_group_name, administrative_state, nf_name, response_message):
"""
Handles the response from Policy, updating the DB
Args:
measurement_group_name (string): The measurement group name
administrative_state (string): The administrative state of the measurement group
nf_name (string): The network function name
response_message (string): The message in the response
regarding the state (success|failed)
"""
logger.info(f'Response from MR: measurement group name: {measurement_group_name} for '
f'NF: {nf_name} received, updating the DB')
try:
nf_measure_grp_status = subscription_nf_states[administrative_state][response_message]\
.value
policy_response_handle_functions[administrative_state][response_message](
measurement_group_name=measurement_group_name, status=nf_measure_grp_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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