113 lines
3.8 KiB
Python
113 lines
3.8 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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from heat.common.i18n import _
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from heat.engine import attributes
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from heat.engine import constraints
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from heat.engine.hot import parameters
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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 Value(resource.Resource):
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"""A resource which exposes its value property as an attribute.
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This is useful for exposing a value that is a simple manipulation
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of other template parameters and/or other resources.
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"""
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support_status = support.SupportStatus(version='7.0.0')
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PROPERTIES = (
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VALUE, TYPE,
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) = (
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'value', constraints.Schema.TYPE,
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)
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ATTRIBUTES = (
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VALUE_ATTR,
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) = (
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'value',
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)
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properties_schema = {
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VALUE: properties.Schema(
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properties.Schema.ANY,
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_('The expression to generate the "value" attribute.'),
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required=True,
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update_allowed=True,
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),
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TYPE: properties.Schema(
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properties.Schema.STRING,
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_('The type of the "value" property.'),
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constraints=[constraints.AllowedValues(
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parameters.HOTParamSchema.TYPES)],
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update_allowed=True,
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),
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}
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attributes_schema = {
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VALUE_ATTR: attributes.Schema(
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_('The value generated by this resource\'s properties "value" '
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'expression, with type determined from the properties "type".'),
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),
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}
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def _resolve_attribute(self, name):
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props = self.frozen_definition().properties(self.properties_schema,
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self.context)
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if name == self.VALUE_ATTR:
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return props[self.VALUE]
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def handle_create(self):
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self.resource_id_set(self.physical_resource_name())
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def handle_update(self, json_snippet, tmpl_diff, prop_diff):
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# allow update, no replace necessary (do not throw UpdateReplace).
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# the resource properties are updated appropriately in parent class.
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pass
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def reparse(self, *args, **kwargs):
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super(Value, self).reparse(*args, **kwargs)
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value_type = self.properties[self.TYPE]
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if value_type is None:
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# We don't know what type the value is, anything goes
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return
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param_type_map = {
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parameters.HOTParamSchema.STRING: constraints.Schema.STRING,
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parameters.HOTParamSchema.NUMBER: constraints.Schema.NUMBER,
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parameters.HOTParamSchema.LIST: constraints.Schema.LIST,
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parameters.HOTParamSchema.MAP: constraints.Schema.MAP,
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parameters.HOTParamSchema.BOOLEAN: constraints.Schema.BOOLEAN,
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}
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if value_type not in param_type_map:
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# the self.TYPE value is not valid, the error will become
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# apparent appropriately when its constraints are checked.
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return
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# We know the value's type, update value's property schema accordingly
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self.properties.props[self.VALUE] = properties.Property(
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properties.Schema(
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param_type_map[value_type],
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_('The expression to generate the "value" attribute.'),
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required=True,
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update_allowed=True,
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))
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def resource_mapping():
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return {
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'OS::Heat::Value': Value,
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}
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