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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 abc |
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import importlib |
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import inspect |
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import six |
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from st2common import log as logging |
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from st2common.persistence import policy as policy_access |
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from st2common.services import coordination |
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LOG = logging.getLogger(__name__) |
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__all__ = [ |
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'ResourcePolicyApplicator', |
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'get_driver' |
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] |
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@six.add_metaclass(abc.ABCMeta) |
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class ResourcePolicyApplicator(object): |
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"""Abstract policy application class.""" |
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def __init__(self, policy_ref, policy_type): |
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self._policy_ref = policy_ref |
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self._policy_type = policy_type |
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def apply_before(self, target): |
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""" |
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Apply the policy before the target do work. |
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:param target: The instance of the resource being affected by this policy. |
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:type target: ``object`` |
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:rtype: ``object`` |
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""" |
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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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return target |
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def apply_after(self, target): |
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""" |
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Apply the policy after the target does work. |
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:param target: The instance of the resource being affected by this policy. |
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:type target: ``object`` |
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:rtype: ``object`` |
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""" |
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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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return target |
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def _get_lock_name(self, values): |
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""" |
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Return a safe string which can be used as a lock name. |
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:param values: Dictionary with values to use in the lock name. |
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:type values: ``dict`` |
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:rtype: ``st`` |
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""" |
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lock_uid = [] |
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for key, value in six.iteritems(values): |
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lock_uid.append('%s=%s' % (key, value)) |
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lock_uid = ','.join(lock_uid) |
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return lock_uid |
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def get_driver(policy_ref, policy_type, **parameters): |
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policy_type_db = policy_access.PolicyType.get_by_ref(policy_type) |
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module = importlib.import_module(policy_type_db.module, package=None) |
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for name, obj in inspect.getmembers(module, predicate=inspect.isclass): |
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if obj.__module__ != module.__name__: |
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# Ignore classes which are just imported, but not defined in the module we are |
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# interested in |
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continue |
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if (issubclass(obj, ResourcePolicyApplicator) and not obj.__name__.startswith('Base')): |
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return obj(policy_ref, policy_type, **parameters) |
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StackStorm /
st2
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