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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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import json |
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import six |
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from st2common.constants import action as action_constants |
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from st2common import log as logging |
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from st2common.persistence import action as action_access |
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from st2common.policies import base |
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from st2common.services import action as action_service |
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from st2common.services import coordination |
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LOG = logging.getLogger(__name__) |
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class ConcurrencyByAttributeApplicator(base.ResourcePolicyApplicator): |
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def __init__(self, policy_ref, policy_type, *args, **kwargs): |
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super(ConcurrencyByAttributeApplicator, self).__init__(policy_ref, policy_type, |
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*args, **kwargs) |
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self.coordinator = coordination.get_coordinator() |
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self.threshold = kwargs.get('threshold', 0) |
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self.attributes = kwargs.get('attributes', []) |
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def _get_lock_uid(self, target): |
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meta = { |
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'policy_type': self._policy_type, |
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'action': target.action, |
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'attributes': self.attributes |
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} |
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return json.dumps(meta) |
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def _get_filters(self, target): |
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filters = {('parameters__%s' % k): v |
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for k, v in six.iteritems(target.parameters) |
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if k in self.attributes} |
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filters['action'] = target.action |
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filters['status'] = None |
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return filters |
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def _apply_before(self, target): |
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# Get the count of scheduled and running instances of the action. |
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filters = self._get_filters(target) |
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# Get the count of scheduled instances of the action. |
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filters['status'] = action_constants.LIVEACTION_STATUS_SCHEDULED |
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scheduled = action_access.LiveAction.count(**filters) |
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# Get the count of running instances of the action. |
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filters['status'] = action_constants.LIVEACTION_STATUS_RUNNING |
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running = action_access.LiveAction.count(**filters) |
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count = scheduled + running |
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# Mark the execution as scheduled if threshold is not reached or delayed otherwise. |
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if count < self.threshold: |
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LOG.debug('There are %s instances of %s in scheduled or running status. ' |
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'Threshold of %s is not reached. Action execution will be scheduled.', |
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count, target.action, self._policy_ref) |
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status = action_constants.LIVEACTION_STATUS_SCHEDULED |
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else: |
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LOG.debug('There are %s instances of %s in scheduled or running status. ' |
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'Threshold of %s is reached. Action execution will be delayed.', |
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count, target.action, self._policy_ref) |
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status = action_constants.LIVEACTION_STATUS_DELAYED |
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# Update the status in the database but do not publish. |
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target = action_service.update_status(target, status, publish=False) |
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return target |
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def apply_before(self, target): |
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# Exit if target not in schedulable state. |
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if target.status != action_constants.LIVEACTION_STATUS_REQUESTED: |
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LOG.debug('The live action is not schedulable therefore the policy ' |
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'"%s" cannot be applied. %s', self._policy_ref, target) |
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return target |
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# Warn users that the coordination service is not configured. |
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if not coordination.configured(): |
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LOG.warn('Coordination service is not configured. Policy enforcement is best effort.') |
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# Acquire a distributed lock before querying the database to make sure that only one |
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# scheduler is scheduling execution for this action. Even if the coordination service |
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# is not configured, the fake driver using zake or the file driver can still acquire |
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# a lock for the local process or server respectively. |
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lock_uid = self._get_lock_uid(target) |
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LOG.debug('%s is attempting to acquire lock "%s".', self.__class__.__name__, lock_uid) |
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with self.coordinator.get_lock(lock_uid): |
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target = self._apply_before(target) |
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return target |
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def _apply_after(self, target): |
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# Schedule the oldest delayed executions. |
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filters = self._get_filters(target) |
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filters['status'] = action_constants.LIVEACTION_STATUS_DELAYED |
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requests = action_access.LiveAction.query(order_by=['start_timestamp'], limit=1, **filters) |
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if requests: |
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action_service.update_status( |
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requests[0], action_constants.LIVEACTION_STATUS_REQUESTED, publish=True) |
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def apply_after(self, target): |
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# Warn users that the coordination service is not configured. |
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if not coordination.configured(): |
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LOG.warn('Coordination service is not configured. Policy enforcement is best effort.') |
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# Acquire a distributed lock before querying the database to make sure that only one |
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# scheduler is scheduling execution for this action. Even if the coordination service |
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# is not configured, the fake driver using zake or the file driver can still acquire |
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# a lock for the local process or server respectively. |
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lock_uid = self._get_lock_uid(target) |
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LOG.debug('%s is attempting to acquire lock "%s".', self.__class__.__name__, lock_uid) |
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with self.coordinator.get_lock(lock_uid): |
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self._apply_after(target) |
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return target |
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StackStorm /
st2
