OpenStack Orchestration (Heat)
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heat/heat/engine/output.py

93 lines
3.2 KiB

#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import collections
import copy
import six
from heat.common import exception
from heat.engine import function
# Field names that can be passed to Template.get_section_name() in order to
# determine the appropriate name for a particular template format.
FIELDS = (
VALUE, DESCRIPTION,
) = (
'Value', 'Description',
)
class OutputDefinition(object):
"""A definition of a stack output, independent of any template format."""
def __init__(self, name, value, description=None):
self.name = name
self._value = value
self._resolved_value = None
self._description = description
self._deps = None
self._all_dep_attrs = None
def validate(self):
"""Validate the output value without resolving it."""
function.validate(self._value, VALUE)
def required_resource_names(self):
if self._deps is None:
try:
required_resources = function.dependencies(self._value)
self._deps = set(six.moves.map(lambda rp: rp.name,
required_resources))
except (exception.InvalidTemplateAttribute,
exception.InvalidTemplateReference):
# This output ain't gonna work anyway
self._deps = set()
return self._deps
def dep_attrs(self, resource_name, load_all=False):
"""Iterate over attributes of a given resource that this references.
Return an iterator over dependent attributes for specified
resource_name in the output's value field.
"""
if self._all_dep_attrs is None and load_all:
attr_map = collections.defaultdict(set)
for r, a in function.all_dep_attrs(self._value):
attr_map[r].add(a)
self._all_dep_attrs = attr_map
if self._all_dep_attrs is not None:
return iter(self._all_dep_attrs.get(resource_name, []))
return function.dep_attrs(self._value, resource_name)
def get_value(self):
"""Resolve the value of the output."""
if self._resolved_value is None:
self._resolved_value = function.resolve(self._value)
return self._resolved_value
def description(self):
"""Return a description of the output."""
if self._description is None:
return 'No description given'
return six.text_type(self._description)
def render_hot(self):
def items():
if self._description is not None:
yield 'description', self._description
yield 'value', copy.deepcopy(self._value)
return dict(items())