68 lines
2.3 KiB
Python
68 lines
2.3 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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from heat.common import environment_format
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ALLOWED_PARAM_MERGE_STRATEGIES = (OVERWRITE, MERGE, DEEP_MERGE) = (
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'overwrite', 'merge', 'deep_merge')
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def get_param_merge_strategy(merge_strategies, param_key):
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if merge_strategies is None:
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return OVERWRITE
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env_default = merge_strategies.get('default', OVERWRITE)
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merge_strategy = merge_strategies.get(param_key, env_default)
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if merge_strategy in ALLOWED_PARAM_MERGE_STRATEGIES:
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return merge_strategy
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return env_default
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def deep_update(old, new):
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'''Merge nested dictionaries.'''
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for k, v in new.items():
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if isinstance(v, collections.Mapping):
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r = deep_update(old.get(k, {}), v)
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old[k] = r
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else:
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old[k] = new[k]
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return old
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def merge_environments(environment_files, files, params):
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"""Merges environment files into the stack input parameters.
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If a list of environment files have been specified, this call will
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pull the contents of each from the files dict, parse them as
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environments, and merge them into the stack input params. This
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behavior is the same as earlier versions of the Heat client that
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performed this params population client-side.
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:param environment_files: ordered names of the environment files
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found in the files dict
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:type environment_files: list or None
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:param files: mapping of stack filenames to contents
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:type files: dict
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:param params: parameters describing the stack
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:type dict:
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"""
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if environment_files:
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for filename in environment_files:
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raw_env = files[filename]
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parsed_env = environment_format.parse(raw_env)
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deep_update(params, parsed_env)
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