08431c7c06
This give the user a way to set defaults recursively down nested stacks without having to create the parameter in every template (it's ignored if the template does not have the parameter). blueprint env-nested-usability Change-Id: Ie6b4481417204a527d322fd532c341b9acbce473
51 lines
1.6 KiB
Python
51 lines
1.6 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.common import template_format
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SECTIONS = (PARAMETERS, RESOURCE_REGISTRY, PARAMETER_DEFAULTS) = \
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('parameters', 'resource_registry', 'parameter_defaults')
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def parse(env_str):
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"""Takes a string and returns a dict containing the parsed structure."""
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if env_str is None:
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return {}
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try:
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env = template_format.yaml.load(env_str,
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Loader=template_format.yaml_loader)
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except template_format.yaml.YAMLError as yea:
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raise ValueError(yea)
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else:
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if env is None:
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env = {}
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if not isinstance(env, dict):
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raise ValueError(_('The environment is not a valid '
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'YAML mapping data type.'))
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for param in env:
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if param not in SECTIONS:
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raise ValueError(_('environment has wrong section "%s"') % param)
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return env
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def default_for_missing(env):
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"""Checks a parsed environment for missing sections."""
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for param in SECTIONS:
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if param not in env:
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env[param] = {}
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