85 lines
3.0 KiB
Python
85 lines
3.0 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 collections
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import copy
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import six
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from heat.common import exception
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from heat.engine import function
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class OutputDefinition(object):
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"""A definition of a stack output, independent of any template format."""
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def __init__(self, name, value, description=None):
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self.name = name
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self._value = value
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self._resolved_value = None
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self._description = description
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self._deps = None
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self._all_dep_attrs = None
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def validate(self, path=''):
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"""Validate the output value without resolving it."""
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function.validate(self._value, path)
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def required_resource_names(self):
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if self._deps is None:
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try:
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required_resources = function.dependencies(self._value)
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self._deps = set(six.moves.map(lambda rp: rp.name,
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required_resources))
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except (exception.InvalidTemplateAttribute,
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exception.InvalidTemplateReference):
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# This output ain't gonna work anyway
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self._deps = set()
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return self._deps
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def dep_attrs(self, resource_name, load_all=False):
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"""Iterate over attributes of a given resource that this references.
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Return an iterator over dependent attributes for specified
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resource_name in the output's value field.
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"""
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if self._all_dep_attrs is None and load_all:
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attr_map = collections.defaultdict(set)
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for r, a in function.all_dep_attrs(self._value):
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attr_map[r].add(a)
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self._all_dep_attrs = attr_map
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if self._all_dep_attrs is not None:
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return iter(self._all_dep_attrs.get(resource_name, []))
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return function.dep_attrs(self._value, resource_name)
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def get_value(self):
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"""Resolve the value of the output."""
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if self._resolved_value is None:
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self._resolved_value = function.resolve(self._value)
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return self._resolved_value
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def description(self):
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"""Return a description of the output."""
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if self._description is None:
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return 'No description given'
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return six.text_type(self._description)
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def render_hot(self):
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def items():
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if self._description is not None:
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yield 'description', self._description
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yield 'value', copy.deepcopy(self._value)
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return dict(items())
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