OpenStack Orchestration (Heat)
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# 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 urllib2
import json
import logging
from heat.common import exception
from heat.engine.resources import Resource
from heat.db import api as db_api
from heat.engine import parser
logger = logging.getLogger(__file__)
(PROP_TEMPLATE_URL,
PROP_TIMEOUT_MINS,
PROP_PARAMETERS) = ('TemplateURL', 'TimeoutInMinutes', 'Parameters')
class Stack(Resource):
properties_schema = {PROP_TEMPLATE_URL: {'Type': 'String',
'Required': True},
PROP_TIMEOUT_MINS: {'Type': 'Number'},
PROP_PARAMETERS: {'Type': 'Map'}}
def __init__(self, name, json_snippet, stack):
Resource.__init__(self, name, json_snippet, stack)
self._nested = None
def _params(self):
p = self.stack.resolve_runtime_data(self.properties[PROP_PARAMETERS])
return p
def nested(self):
if self._nested is None and self.instance_id is not None:
self._nested = parser.Stack.load(self.context,
self.instance_id)
if self._nested is None:
raise exception.NotFound('Nested stack not found in DB')
return self._nested
def create_with_template(self, child_template):
'''
Handle the creation of the nested stack from a given JSON template.
'''
template = parser.Template(child_template)
params = parser.Parameters(self.name, template, self._params())
self._nested = parser.Stack(self.context,
self.name,
template,
params)
nested_id = self._nested.store(self.stack)
self.instance_id_set(nested_id)
self._nested.create()
def handle_create(self):
response = urllib2.urlopen(self.properties[PROP_TEMPLATE_URL])
template = json.load(response)
self.create_with_template(template)
def handle_delete(self):
try:
stack = self.nested()
except exception.NotFound:
logger.info("Stack not found to delete")
else:
if stack is not None:
stack.delete()
def FnGetAtt(self, key):
if not key.startswith('Outputs.'):
raise exception.InvalidTemplateAttribute(resource=self.name,
key=key)
prefix, dot, op = key.partition('.')
stack = self.nested()
if stack is None:
# This seems like a hack, to get past validation
return ''
if op not in stack.outputs:
raise exception.InvalidTemplateAttribute(resource=self.name,
key=key)
return stack.output(op)