73 lines
2.4 KiB
Python
73 lines
2.4 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import uuid
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from heat.engine import properties
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from heat.engine import resource
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from heat.engine import support
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class NoneResource(resource.Resource):
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"""Enables easily disabling certain resources via the resource_registry.
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It does nothing, but can effectively stub out any other resource because it
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will accept any properties and return any attribute (as None). Note this
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resource always does nothing on update (e.g it is not replaced even if a
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change to the stubbed resource properties would cause replacement).
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"""
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support_status = support.SupportStatus(version='5.0.0')
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properties_schema = {}
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attributes_schema = {}
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IS_PLACEHOLDER = 'is_placeholder'
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def _needs_update(self, after, before, after_props, before_props,
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prev_resource, check_init_complete=True):
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return False
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def frozen_definition(self):
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return self.t.freeze(
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properties=properties.Properties(schema={}, data={}))
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def reparse(self, client_resolve=True):
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self.properties = properties.Properties(schema={}, data={})
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self.translate_properties(self.properties, client_resolve)
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def handle_create(self):
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self.resource_id_set(str(uuid.uuid4()))
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# set is_placeholder flag when resource trying to replace original
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# resource with a placeholder resource.
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self.data_set(self.IS_PLACEHOLDER, 'True')
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def validate(self):
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pass
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def get_attribute(self, key, *path):
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return None
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def handle_delete(self):
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# Will not triger the delete method in client if this is not
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# a placeholder resource.
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if not self.data().get(self.IS_PLACEHOLDER):
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return super(NoneResource, self).handle_delete()
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return self.resource_id
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def resource_mapping():
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return {
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'OS::Heat::None': NoneResource,
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}
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