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# ================================================================================
# Copyright (c) 2018-2019 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# 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.
# ============LICENSE_END=========================================================
#
"""
policy-receiver communicates with policy-engine
thru web-socket to receive push notifications
on updates and removal of policies.
on receiving the policy-notifications, the policy-receiver
passes the notifications to policy-updater
"""
from .service_activator import ServiceActivator
class PolicyReceiver(object):
"""
policy-receiver - static singleton wrapper around two threads
policy_updater - master thread for all scheduled actions
policy_listener - listens to policy-engine through web-socket
"""
_policy_updater = None
_policy_listener = None
@staticmethod
def is_running():
"""check whether the policy-receiver runs"""
return (PolicyReceiver._policy_listener
and PolicyReceiver._policy_listener.is_alive()
and PolicyReceiver._policy_updater
and PolicyReceiver._policy_updater.is_alive())
@staticmethod
def _close_listener(audit):
"""stop the notification-handler"""
if PolicyReceiver._policy_listener:
policy_receiver = PolicyReceiver._policy_listener
PolicyReceiver._policy_listener = None
policy_receiver.shutdown(audit)
@staticmethod
def shutdown(audit):
"""shutdown the notification-handler and policy-updater"""
PolicyReceiver._close_listener(audit)
PolicyReceiver._policy_updater.shutdown(audit)
@staticmethod
def catch_up(audit):
"""request to bring the latest policies to DCAE"""
PolicyReceiver._policy_updater.catch_up(audit)
@staticmethod
def reconfigure(audit):
"""request to reconfigure the updated config for policy-handler"""
PolicyReceiver._policy_updater.reconfigure(audit)
@staticmethod
def _on_reconfigure(audit):
"""act on reconfiguration event"""
active = ServiceActivator.is_active_mode_of_operation(audit)
if not PolicyReceiver._policy_listener:
if active:
from . import pdp_client
PolicyReceiver._policy_listener = pdp_client.PolicyListener(
audit, PolicyReceiver._policy_updater
)
PolicyReceiver._policy_listener.start()
return
if not active:
PolicyReceiver._close_listener(audit)
return
PolicyReceiver._policy_listener.reconfigure(audit)
@staticmethod
def run(audit):
"""run policy_updater and policy_receiver"""
from .policy_updater import PolicyUpdater
PolicyReceiver._policy_updater = PolicyUpdater(PolicyReceiver._on_reconfigure)
PolicyReceiver._on_reconfigure(audit)
PolicyReceiver._policy_updater.start()
PolicyReceiver.catch_up(audit)
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