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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 enum import Enum
from mod import logger
from mod.network_function import NetworkFunction
class XNFType(Enum):
PNF = 'pnf'
VNF = 'vnf'
class AAIEvent(Enum):
DELETE = 'DELETE'
UPDATE = 'UPDATE'
def process_aai_events(mr_sub, mr_pub, app, app_conf):
"""
Processes AAI UPDATE events for each filtered xNFs where orchestration status is set to Active.
Args:
mr_sub (_MrSub): MR subscriber
mr_pub (_MrPub): MR publisher
app (db): DB application
app_conf (AppConfig): the application configuration.
"""
app.app_context().push()
logger.info('Polling MR for XNF AAI events.')
try:
aai_events = mr_sub.get_from_topic('dcae_pmsh_aai_event')
if aai_events is not None and len(aai_events) != 0:
aai_events = [json.loads(e) for e in aai_events]
xnf_events = [e for e in aai_events if e['event-header']['entity-type'] == (
XNFType.PNF.value or XNFType.VNF.value)]
for entry in xnf_events:
logger.debug(f'AAI-EVENT entry: {entry}')
aai_entity = entry['entity']
action = entry['event-header']['action']
entity_type = entry['event-header']['entity-type']
xnf_name = aai_entity['pnf-name'] if entity_type == XNFType.PNF.value \
else aai_entity['vnf-name']
if aai_entity['orchestration-status'] != 'Active':
logger.info(f'Skipping XNF {xnf_name} as its orchestration-status '
f'is not "Active"')
continue
nf = NetworkFunction(nf_name=xnf_name,
ip_address=aai_entity['ipaddress-v4-oam'],
model_invariant_id=aai_entity['model-invariant-id'],
model_version_id=aai_entity['model-version-id'])
if not nf.set_nf_model_params(app_conf):
continue
if app_conf.nf_filter.is_nf_in_filter(nf):
_process_event(action, nf, mr_pub, app_conf)
except Exception as e:
logger.error(f'Failed to process AAI event: {e}', exc_info=True)
def _process_event(action, nf, mr_pub, app_conf):
if action == AAIEvent.UPDATE.value:
logger.info(f'Update event found for network function {nf.nf_name}')
app_conf.subscription.create_subscription_on_nfs([nf], mr_pub, app_conf)
elif action == AAIEvent.DELETE.value:
logger.info(f'Delete event found for network function {nf.nf_name}')
NetworkFunction.delete(nf_name=nf.nf_name)
logger.info(f'{nf.nf_name} successfully deleted.')
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