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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 pmsh_logging as logger
from mod.network_function import NetworkFunction
from mod.subscription import NetworkFunctionFilter
class XNFType(Enum):
PNF = 'pnf'
VNF = 'vnf'
class AAIEvent(Enum):
DELETE = 'DELETE'
UPDATE = 'UPDATE'
class OrchestrationStatus(Enum):
ACTIVE = 'Active'
INVENTORIED = 'Inventoried'
def process_aai_events(mr_sub, subscription, mr_pub, app):
"""
Processes AAI UPDATE events for each filtered xNFs where orchestration status is set to Active.
Args:
mr_sub (_MrSub): MR subscriber
subscription (Subscription): The current subscription object
mr_pub (_MrPub): MR publisher
app (db): DB application
"""
app.app_context().push()
aai_events = mr_sub.get_from_topic('AAI-EVENT')
if _aai_event_exists(aai_events):
for entry in aai_events:
logger.debug(f'AAI-EVENT entry: {entry}')
entry = json.loads(entry)
event_header = entry['event-header']
aai_xnf = entry['entity']
action = event_header['action']
entity_type = event_header['entity-type']
xnf_name = aai_xnf['pnf-name'] if entity_type == XNFType.PNF.value else aai_xnf[
'vnf-name']
new_status = aai_xnf['orchestration-status']
if NetworkFunctionFilter(**subscription.nfFilter).is_nf_in_filter(xnf_name):
_process_event(action, new_status, xnf_name, subscription, mr_pub)
def _process_event(action, new_status, xnf_name, subscription, mr_pub):
if action == AAIEvent.UPDATE.value:
logger.debug(f'Update event found for network function {xnf_name}')
local_xnf = NetworkFunction.get(xnf_name)
if local_xnf is None:
logger.debug(f'Activating subscription for network function {xnf_name}')
subscription.process_subscription([NetworkFunction(
nf_name=xnf_name, orchestration_status=new_status)], mr_pub)
else:
logger.debug(f"Update Event for network function {xnf_name} will not be processed "
f" as it's state is set to {local_xnf.orchestration_status}.")
elif action == AAIEvent.DELETE.value:
logger.debug(f'Delete event found for network function {xnf_name}')
NetworkFunction.delete(nf_name=xnf_name)
logger.debug(f'{xnf_name} successfully deleted.')
def _aai_event_exists(aai_events):
return aai_events is not None and len(aai_events) != 0
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