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# ============LICENSE_START===================================================
# Copyright (C) 2019-2021 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=====================================================
from jsonschema import ValidationError
from mod import logger, aai_client
from mod.aai_client import _filter_nf_data, get_pmsh_nfs_from_aai
from mod.aai_event_handler import process_aai_events
from mod.network_function import NetworkFunctionFilter
from mod.pmsh_utils import PeriodicTask
from mod.subscription import AdministrativeState, Subscription, get_nfs_for_creation_and_deletion
class SubscriptionHandler:
def __init__(self, mr_pub, aai_sub, app, app_conf):
self.mr_pub = mr_pub
self.aai_sub = aai_sub
self.app = app
self.app_conf = app_conf
self.aai_event_thread = None
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()
try:
local_admin_state = self.app_conf.subscription.get_local_sub_admin_state()
if local_admin_state == AdministrativeState.LOCKING.value:
self._check_for_failed_nfs()
else:
self.app_conf.refresh_config()
self.app_conf.validate_sub_schema()
local_admin_state = self.apply_subscription_changes()
self.compare_admin_state(local_admin_state)
except (ValidationError, TypeError) as err:
logger.error(f'Error occurred during validation of subscription schema {err}',
exc_info=True)
except Exception as err:
logger.error(f'Error occurred during the activation/deactivation process {err}',
exc_info=True)
def apply_subscription_changes(self):
""" Applies changes to subscription
Args:
local_admin_state(enum): The local adminstrative state
Returns:
Enum: Updated administrative state
"""
local_admin_state = self.app_conf.subscription.get_local_sub_admin_state()
if local_admin_state == AdministrativeState.FILTERING.value:
existing_nfs = self.app_conf.subscription.get_network_functions()
self.app_conf.nf_filter = \
NetworkFunctionFilter(**self.app_conf.subscription.nfFilter)
new_nfs = get_pmsh_nfs_from_aai(self.app_conf)
self.app_conf.subscription.update_subscription_filter()
get_nfs_for_creation_and_deletion(existing_nfs, new_nfs, 'delete',
self.mr_pub, self.app_conf)
get_nfs_for_creation_and_deletion(existing_nfs, new_nfs, 'create',
self.mr_pub, self.app_conf)
return local_admin_state
def compare_admin_state(self, local_admin_state):
""" Check for changes in administrative state
Args:
local_admin_state(enum):
"""
new_administrative_state = self.app_conf.subscription.administrativeState
if local_admin_state == new_administrative_state:
logger.info(f'Administrative State did not change in the app config: '
f'{new_administrative_state}')
else:
self._check_state_change(local_admin_state, new_administrative_state)
def fetch_aai_nf_data(self):
""" Fetchs AAI data
Returns:
dict: the json response from AAI query after filter is applied
"""
aai_nf_data = aai_client._get_all_aai_nf_data(self.app_conf)
if aai_nf_data:
new_nfs = _filter_nf_data(aai_nf_data, self.app_conf)
else:
raise RuntimeError('Failed to get data from AAI')
return new_nfs
def _check_state_change(self, local_admin_state, new_administrative_state):
if new_administrative_state == AdministrativeState.UNLOCKED.value:
logger.info(f'Administrative State has changed from {local_admin_state} '
f'to {new_administrative_state}.')
self._activate(new_administrative_state)
elif new_administrative_state == AdministrativeState.LOCKED.value:
logger.info(f'Administrative State has changed from {local_admin_state} '
f'to {new_administrative_state}.')
self._deactivate()
else:
raise Exception(f'Invalid AdministrativeState: {new_administrative_state}')
def _activate(self, new_administrative_state):
if not self.app_conf.nf_filter:
self.app_conf.nf_filter = NetworkFunctionFilter(**self.app_conf.subscription.nfFilter)
self._start_aai_event_thread()
self.app_conf.subscription.update_sub_params(new_administrative_state,
self.app_conf.subscription.fileBasedGP,
self.app_conf.subscription.fileLocation,
self.app_conf.subscription.measurementGroups)
nfs_in_aai = aai_client.get_pmsh_nfs_from_aai(self.app_conf)
self.app_conf.subscription.create_subscription_on_nfs(nfs_in_aai, self.mr_pub,
self.app_conf)
self.app_conf.subscription.update_subscription_status()
def _deactivate(self):
nfs = self.app_conf.subscription.get_network_functions()
if nfs:
self.stop_aai_event_thread()
self.app_conf.subscription.administrativeState = AdministrativeState.LOCKING.value
logger.info('Subscription is now LOCKING/DEACTIVATING.')
self.app_conf.subscription.delete_subscription_from_nfs(nfs, self.mr_pub, self.app_conf)
self.app_conf.subscription.update_subscription_status()
def _start_aai_event_thread(self):
logger.info('Starting polling for NF info on AAI-EVENT topic on DMaaP MR.')
self.aai_event_thread = PeriodicTask(20, process_aai_events, args=(self.aai_sub,
self.mr_pub,
self.app,
self.app_conf))
self.aai_event_thread.name = 'aai_event_thread'
self.aai_event_thread.start()
def stop_aai_event_thread(self):
if self.aai_event_thread is not None:
self.aai_event_thread.cancel()
self.aai_event_thread = None
logger.info('Stopping polling for NFs events on AAI-EVENT topic in MR.')
def _check_for_failed_nfs(self):
logger.info('Checking for DELETE_FAILED NFs before LOCKING Subscription.')
del_failed_nfs = self.app_conf.subscription.get_delete_failed_nfs()
if del_failed_nfs or self.app_conf.subscription.get_delete_pending_nfs():
for nf in del_failed_nfs:
nf_model = nf.get(nf.nf_name)
if nf_model.retry_count < 3:
logger.info(f'Retry deletion of subscription '
f'{self.app_conf.subscription.subscriptionName} '
f'from NF: {nf.nf_name}')
self.app_conf.subscription.delete_subscription_from_nfs([nf], self.mr_pub,
self.app_conf)
nf.increment_retry_count()
else:
logger.error(f'Failed to delete the subscription '
f'{self.app_conf.subscription.subscriptionName} '
f'from NF: {nf.nf_name} after {nf_model.retry_count} '
f'attempts. Removing NF from DB')
nf.delete(nf_name=nf.nf_name)
else:
logger.info('Proceeding to LOCKED adminState.')
self.app_conf.subscription.administrativeState = AdministrativeState.LOCKED.value
self.app_conf.subscription.update_subscription_status()
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