103 lines
3.3 KiB
Python
103 lines
3.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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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 re
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import yaml
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import json
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HEAT_VERSIONS = (u'2012-12-12',)
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CFN_VERSIONS = (u'2010-09-09',)
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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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yaml.Loader.add_constructor(u'tag:yaml.org,2002:str', _construct_yaml_str)
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yaml.SafeLoader.add_constructor(u'tag:yaml.org,2002:str', _construct_yaml_str)
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def parse(tmpl_str, add_template_sections=True):
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'''
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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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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.safe_load(tmpl_str)
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except yaml.scanner.ScannerError as e:
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raise ValueError(e)
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else:
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if tpl is None:
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tpl = {}
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if add_template_sections:
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default_for_missing(tpl, u'HeatTemplateFormatVersion',
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HEAT_VERSIONS)
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return tpl
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def default_for_missing(tpl, version_param, versions):
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'''
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Checks a parsed template for missing version and sections.
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This is currently only applied to YAML templates.
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'''
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# if version is missing, implicitly use the lastest one
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if version_param not in tpl:
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tpl[version_param] = versions[-1]
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# create empty placeholders for any of the main dict sections
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for param in (u'Parameters', u'Mappings', u'Resources', u'Outputs'):
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if param not in tpl:
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tpl[param] = {}
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def convert_json_to_yaml(json_str):
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'''Convert a string containing the AWS JSON template format
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to an equivalent string containing the Heat YAML format.
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'''
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global key_order
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# Replace AWS format version with Heat format version
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json_str = re.sub('"AWSTemplateFormatVersion"\s*:\s*"[^"]+"\s*,',
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'', json_str)
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# insert a sortable order into the key to preserve file ordering
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key_order = 0
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def order_key(matchobj):
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global key_order
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key = '%s"__%05d__order__%s" :' % (
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matchobj.group(1),
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key_order,
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matchobj.group(2))
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key_order = key_order + 1
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return key
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key_re = re.compile('^(\s*)"([^"]+)"\s*:', re.M)
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json_str = key_re.sub(order_key, json_str)
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# parse the string as json to a python structure
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tpl = yaml.safe_load(json_str)
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# dump python structure to yaml
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yml = "HeatTemplateFormatVersion: '2012-12-12'\n" + yaml.safe_dump(tpl)
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# remove ordering from key names
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yml = re.sub('__\d*__order__', '', yml)
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return yml
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