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"""policy-engine-client communicates with policy-engine thru PolicyEngine client object"""
# org.onap.dcae
# ================================================================================
# Copyright (c) 2017 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=========================================================
#
# ECOMP is a trademark and service mark of AT&T Intellectual Property.
import logging
import re
from .config import Config, PolicyEngineConfig
from .onap.audit import Audit
from .PolicyEngine import PolicyEngine, NotificationHandler, NotificationScheme
from .policy_updater import PolicyUpdater
class PolicyNotificationHandler(NotificationHandler):
"""handler of the policy-engine push notifications"""
_logger = logging.getLogger("policy_handler.policy_notification")
def __init__(self, policy_updater):
scope_prefixes = [scope_prefix.replace(".", "[.]") \
for scope_prefix in Config.config["scope_prefixes"]]
self._policy_scopes = re.compile("(" + "|".join(scope_prefixes) + ")")
PolicyNotificationHandler._logger.info("_policy_scopes %s", self._policy_scopes.pattern)
self._policy_updater = policy_updater
self._policy_updater.start()
def notificationReceived(self, notification):
if not notification or not notification._loadedPolicies:
return
policy_names = [loaded._policyName \
for loaded in notification._loadedPolicies \
if self._policy_scopes.match(loaded._policyName)]
if not policy_names:
PolicyNotificationHandler._logger.info("no policy updated for scopes %s", \
self._policy_scopes.pattern)
return
audit = Audit(req_message="notificationReceived from PDP")
audit.retry_get_config = True
self._policy_updater.enqueue(audit, policy_names)
class PolicyEngineClient(object):
""" policy-engine client"""
_logger = logging.getLogger("policy_handler.policy_engine")
_policy_updater = None
_pdp_notification_handler = None
_policy_engine = None
@staticmethod
def shutdown(audit):
"""Shutdown the notification-handler"""
PolicyEngineClient._policy_updater.shutdown(audit)
@staticmethod
def catch_up(audit):
"""bring the latest policies from policy-engine"""
PolicyEngineClient._policy_updater.catch_up(audit)
@staticmethod
def create_policy_engine_properties():
"""create the policy_engine.properties file from config.json"""
pass
@staticmethod
def run():
"""Using policy-engine client to talk to policy engine"""
audit = Audit(req_message="start PDP client")
PolicyEngineClient._policy_updater = PolicyUpdater()
PolicyEngineClient._pdp_notification_handler = PolicyNotificationHandler(
PolicyEngineClient._policy_updater)
sub_aud = Audit(aud_parent=audit)
sub_aud.metrics_start("create client to PDP")
PolicyEngineConfig.save_to_file()
PolicyEngineClient._policy_engine = PolicyEngine(PolicyEngineConfig.PATH_TO_PROPERTIES, \
scheme=NotificationScheme.AUTO_ALL_NOTIFICATIONS.name,\
handler=PolicyEngineClient._pdp_notification_handler)
sub_aud.metrics("created client to PDP")
seed_scope = Config.config["scope_prefixes"][0] + ".*"
PolicyEngineClient._policy_engine.getConfig(policyName=seed_scope)
sub_aud.metrics("seeded client by PDP.getConfig for policyName={0}".format(seed_scope))
PolicyEngineClient.catch_up(audit)
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