ac536c6114
As requested in: https://review.openstack.org/#/c/116336/24/heat/engine/stack_resource.py Change-Id: Icea97aa44d2a3461fdfa2324292fd3b2c2f000e1
124 lines
4.0 KiB
Python
124 lines
4.0 KiB
Python
#
|
|
# 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 itertools
|
|
import re
|
|
|
|
from oslo_config import cfg
|
|
from oslo_serialization import jsonutils
|
|
import six
|
|
import yaml
|
|
|
|
from heat.common import exception
|
|
from heat.common.i18n import _
|
|
|
|
cfg.CONF.import_opt('max_template_size', 'heat.common.config')
|
|
|
|
if hasattr(yaml, 'CSafeLoader'):
|
|
yaml_loader = yaml.CSafeLoader
|
|
else:
|
|
yaml_loader = yaml.SafeLoader
|
|
|
|
if hasattr(yaml, 'CSafeDumper'):
|
|
yaml_dumper = yaml.CSafeDumper
|
|
else:
|
|
yaml_dumper = yaml.SafeDumper
|
|
|
|
|
|
def _construct_yaml_str(self, node):
|
|
# Override the default string handling function
|
|
# to always return unicode objects
|
|
return self.construct_scalar(node)
|
|
yaml_loader.add_constructor(u'tag:yaml.org,2002:str', _construct_yaml_str)
|
|
# Unquoted dates like 2013-05-23 in yaml files get loaded as objects of type
|
|
# datetime.data which causes problems in API layer when being processed by
|
|
# openstack.common.jsonutils. Therefore, make unicode string out of timestamps
|
|
# until jsonutils can handle dates.
|
|
yaml_loader.add_constructor(u'tag:yaml.org,2002:timestamp',
|
|
_construct_yaml_str)
|
|
|
|
|
|
def simple_parse(tmpl_str):
|
|
try:
|
|
tpl = jsonutils.loads(tmpl_str)
|
|
except ValueError:
|
|
try:
|
|
tpl = yaml.load(tmpl_str, Loader=yaml_loader)
|
|
except yaml.YAMLError as yea:
|
|
yea = six.text_type(yea)
|
|
msg = _('Error parsing template: %s') % yea
|
|
raise ValueError(msg)
|
|
else:
|
|
if tpl is None:
|
|
tpl = {}
|
|
|
|
if not isinstance(tpl, dict):
|
|
raise ValueError(_('The template is not a JSON object '
|
|
'or YAML mapping.'))
|
|
|
|
return tpl
|
|
|
|
|
|
def parse(tmpl_str):
|
|
"""Takes a string and returns a dict containing the parsed structure.
|
|
|
|
This includes determination of whether the string is using the
|
|
JSON or YAML format.
|
|
"""
|
|
if len(tmpl_str) > cfg.CONF.max_template_size:
|
|
msg = (_('Template exceeds maximum allowed size (%s bytes)') %
|
|
cfg.CONF.max_template_size)
|
|
raise exception.RequestLimitExceeded(message=msg)
|
|
tpl = simple_parse(tmpl_str)
|
|
# Looking for supported version keys in the loaded template
|
|
if not ('HeatTemplateFormatVersion' in tpl
|
|
or 'heat_template_version' in tpl
|
|
or 'AWSTemplateFormatVersion' in tpl):
|
|
raise ValueError(_("Template format version not found."))
|
|
return tpl
|
|
|
|
|
|
def convert_json_to_yaml(json_str):
|
|
"""Convert AWS JSON template format to Heat YAML format.
|
|
|
|
:param json_str: a string containing the AWS JSON template format.
|
|
:returns: the equivalent string containing the Heat YAML format.
|
|
"""
|
|
|
|
# Replace AWS format version with Heat format version
|
|
json_str = re.sub('"AWSTemplateFormatVersion"\s*:\s*"[^"]+"\s*,',
|
|
'', json_str)
|
|
|
|
# insert a sortable order into the key to preserve file ordering
|
|
key_order = itertools.count()
|
|
|
|
def order_key(matchobj):
|
|
key = '%s"__%05d__order__%s" :' % (
|
|
matchobj.group(1),
|
|
next(key_order),
|
|
matchobj.group(2))
|
|
return key
|
|
key_re = re.compile('^(\s*)"([^"]+)"\s*:', re.M)
|
|
json_str = key_re.sub(order_key, json_str)
|
|
|
|
# parse the string as json to a python structure
|
|
tpl = yaml.load(json_str, Loader=yaml_loader)
|
|
|
|
# dump python structure to yaml
|
|
tpl["HeatTemplateFormatVersion"] = '2012-12-12'
|
|
yml = yaml.dump(tpl, Dumper=yaml_dumper)
|
|
|
|
# remove ordering from key names
|
|
yml = re.sub('__\d*__order__', '', yml)
|
|
return yml
|