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"""policy-updater thread"""
# 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 json
from Queue import Queue
from threading import Thread, Lock
from .policy_rest import PolicyRest
from .deploy_handler import DeployHandler
class PolicyUpdater(Thread):
"""queue and handle the policy-updates in a separate thread"""
_logger = logging.getLogger("policy_handler.policy_updater")
def __init__(self):
"""init static config of PolicyUpdater."""
Thread.__init__(self)
self.name = "policy_updater"
self.daemon = True
self._req_shutdown = None
self._req_catch_up = None
self._lock = Lock()
self._queue = Queue()
def enqueue(self, audit=None, policy_names=None):
"""enqueue the policy-names"""
policy_names = policy_names or []
PolicyUpdater._logger.info("policy_names %s", json.dumps(policy_names))
self._queue.put((audit, policy_names))
def run(self):
"""wait and run the policy-update in thread"""
while True:
PolicyUpdater._logger.info("waiting for policy-updates...")
audit, policy_names = self._queue.get()
PolicyUpdater._logger.info("got policy-updates %s", json.dumps(policy_names))
if not self._keep_running():
self._queue.task_done()
break
if self._on_catch_up():
continue
if not policy_names:
self._queue.task_done()
continue
updated_policies = PolicyRest.get_latest_policies_by_names((audit, policy_names))
PolicyUpdater.policy_update(audit, updated_policies)
audit.audit_done()
self._queue.task_done()
PolicyUpdater._logger.info("exit policy-updater")
def _keep_running(self):
"""thread-safe check whether to continue running"""
self._lock.acquire()
keep_running = not self._req_shutdown
self._lock.release()
if self._req_shutdown:
self._req_shutdown.audit_done()
return keep_running
def catch_up(self, audit):
"""need to bring the latest policies to DCAE-Controller"""
self._lock.acquire()
self._req_catch_up = audit
self._lock.release()
self.enqueue()
def _on_catch_up(self):
"""Bring the latest policies to DCAE-Controller"""
self._lock.acquire()
req_catch_up = self._req_catch_up
if self._req_catch_up:
self._req_catch_up = None
self._queue.task_done()
self._queue = Queue()
self._lock.release()
if not req_catch_up:
return False
PolicyUpdater._logger.info("catch_up")
latest_policies = PolicyRest.get_latest_policies(req_catch_up)
PolicyUpdater.policy_update(req_catch_up, latest_policies)
req_catch_up.audit_done()
return True
@staticmethod
def policy_update(audit, updated_policies):
"""Invoke deploy-handler"""
if updated_policies:
PolicyUpdater._logger.info("updated_policies %s", json.dumps(updated_policies))
DeployHandler.policy_update(audit, updated_policies)
def shutdown(self, audit):
"""Shutdown the policy-updater"""
PolicyUpdater._logger.info("shutdown policy-updater")
self._lock.acquire()
self._req_shutdown = audit
self._lock.release()
self.enqueue()
if self.is_alive():
self.join()
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