a714e096f3
Update version of tox to 3.9.0 to support inline comments in tox.ini Import pep8 test requirements directly in tox.ini and do not import all the test-requirements Update version of hacking Fix import orders in various modules Leave filter for imports in tests/ for the time being Change-Id: Ia625036d1f50ae97880ef70335804228320a9c6d
72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
# 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 json
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import yaml
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if hasattr(yaml, 'CSafeLoader'):
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yaml_loader = yaml.CSafeLoader
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else:
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yaml_loader = yaml.SafeLoader
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class HeatYamlLoader(yaml_loader):
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pass
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def _construct_yaml_str(self, node):
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# Override the default string handling function
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# to always return unicode objects
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return self.construct_scalar(node)
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HeatYamlLoader.add_constructor(u'tag:yaml.org,2002:str', _construct_yaml_str)
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# Unquoted dates like 2013-05-23 in yaml files get loaded as objects of type
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# datetime.data which causes problems in API layer when being processed by
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# openstack.common.jsonutils. Therefore, make unicode string out of timestamps
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# until jsonutils can handle dates.
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HeatYamlLoader.add_constructor(
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u'tag:yaml.org,2002:timestamp', _construct_yaml_str)
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def parse(tmpl_str):
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"""Takes a string and returns a dict containing the parsed structure.
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This includes determination of whether the string is using the
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JSON or YAML format.
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"""
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# strip any whitespace before the check
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tmpl_str = tmpl_str.strip()
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if tmpl_str.startswith('{'):
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tpl = json.loads(tmpl_str)
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else:
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try:
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tpl = yaml.load(tmpl_str, Loader=HeatYamlLoader)
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except yaml.YAMLError:
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# NOTE(prazumovsky): we need to return more informative error for
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# user, so use SafeLoader, which return error message with template
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# snippet where error has been occurred.
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try:
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tpl = yaml.load(tmpl_str, Loader=yaml.SafeLoader)
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except yaml.YAMLError as yea:
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raise ValueError(yea)
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else:
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if tpl is None:
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tpl = {}
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# Looking for supported version keys in the loaded template
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if not ('HeatTemplateFormatVersion' in tpl
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or 'heat_template_version' in tpl
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or 'AWSTemplateFormatVersion' in tpl):
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raise ValueError("Template format version not found.")
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return tpl
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