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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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from kombu import Connection |
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from st2common import log as logging |
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from st2common.constants import action as action_constants |
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from st2common.exceptions.db import StackStormDBObjectNotFoundError |
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from st2common.models.db.liveaction import LiveActionDB |
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from st2common.services import action as action_service |
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from st2common.persistence.liveaction import LiveAction |
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from st2common.persistence.policy import Policy |
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from st2common import policies |
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from st2common.transport import consumers, liveaction |
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from st2common.transport import utils as transport_utils |
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from st2common.util import action_db as action_utils |
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__all__ = [ |
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'get_scheduler', |
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] |
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LOG = logging.getLogger(__name__) |
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ACTIONRUNNER_REQUEST_Q = liveaction.get_status_management_queue( |
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'st2.actionrunner.req', routing_key=action_constants.LIVEACTION_STATUS_REQUESTED) |
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class ActionExecutionScheduler(consumers.MessageHandler): |
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message_type = LiveActionDB |
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def process(self, request): |
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"""Schedules the LiveAction and publishes the request |
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to the appropriate action runner(s). |
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LiveAction in statuses other than "requested" are ignored. |
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:param request: Action execution request. |
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:type request: ``st2common.models.db.liveaction.LiveActionDB`` |
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""" |
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if request.status != action_constants.LIVEACTION_STATUS_REQUESTED: |
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LOG.info('%s is ignoring %s (id=%s) with "%s" status.', |
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self.__class__.__name__, type(request), request.id, request.status) |
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return |
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try: |
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liveaction_db = action_utils.get_liveaction_by_id(request.id) |
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except StackStormDBObjectNotFoundError: |
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LOG.exception('Failed to find liveaction %s in the database.', request.id) |
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raise |
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# Apply policies defined for the action. |
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for policy_db in Policy.query(resource_ref=liveaction_db.action): |
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driver = policies.get_driver(policy_db.ref, |
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policy_db.policy_type, |
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**policy_db.parameters) |
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try: |
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liveaction_db = driver.apply_before(liveaction_db) |
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except: |
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LOG.exception('An exception occurred while applying policy "%s".', policy_db.ref) |
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if liveaction_db.status == action_constants.LIVEACTION_STATUS_DELAYED: |
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break |
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# Exit if the status of the request is no longer runnable. |
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# The status could have be changed by one of the policies. |
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if liveaction_db.status not in [action_constants.LIVEACTION_STATUS_REQUESTED, |
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action_constants.LIVEACTION_STATUS_SCHEDULED]: |
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LOG.info('%s is ignoring %s (id=%s) with "%s" status after policies are applied.', |
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self.__class__.__name__, type(request), request.id, liveaction_db.status) |
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return |
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# Update liveaction status to "scheduled". |
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if liveaction_db.status == action_constants.LIVEACTION_STATUS_REQUESTED: |
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liveaction_db = action_service.update_status( |
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liveaction_db, action_constants.LIVEACTION_STATUS_SCHEDULED, publish=False) |
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# Publish the "scheduled" status here manually. Otherwise, there could be a |
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# race condition with the update of the action_execution_db if the execution |
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# of the liveaction completes first. |
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LiveAction.publish_status(liveaction_db) |
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def get_scheduler(): |
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with Connection(transport_utils.get_messaging_urls()) as conn: |
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return ActionExecutionScheduler(conn, [ACTIONRUNNER_REQUEST_Q]) |
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StackStorm /
st2
