106 lines
3.6 KiB
Python
106 lines
3.6 KiB
Python
# 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 abc
|
|
import collections
|
|
import functools
|
|
|
|
from heat.db import api as db_api
|
|
|
|
|
|
class Template(collections.Mapping):
|
|
'''A stack template.'''
|
|
|
|
def __new__(cls, template, *args, **kwargs):
|
|
'''Create a new Template of the appropriate class.'''
|
|
|
|
if cls == Template:
|
|
# deferred module imports to avoid circular dependency
|
|
if 'heat_template_version' in template:
|
|
from heat.engine import hot
|
|
return hot.HOTemplate(template, *args, **kwargs)
|
|
else:
|
|
from heat.engine.cfn import template as cfn
|
|
return cfn.CfnTemplate(template, *args, **kwargs)
|
|
|
|
return super(Template, cls).__new__(cls)
|
|
|
|
def __init__(self, template, template_id=None, files=None):
|
|
'''
|
|
Initialise the template with a JSON object and a set of Parameters
|
|
'''
|
|
self.id = template_id
|
|
self.t = template
|
|
self.files = files or {}
|
|
self.maps = self[self.MAPPINGS]
|
|
|
|
@classmethod
|
|
def load(cls, context, template_id):
|
|
'''Retrieve a Template with the given ID from the database.'''
|
|
t = db_api.raw_template_get(context, template_id)
|
|
return cls(t.template, template_id=template_id, files=t.files)
|
|
|
|
def store(self, context=None):
|
|
'''Store the Template in the database and return its ID.'''
|
|
if self.id is None:
|
|
rt = {
|
|
'template': self.t,
|
|
'files': self.files
|
|
}
|
|
new_rt = db_api.raw_template_create(context, rt)
|
|
self.id = new_rt.id
|
|
return self.id
|
|
|
|
def __iter__(self):
|
|
'''Return an iterator over the section names.'''
|
|
return (s for s in self.SECTIONS
|
|
if s not in self.SECTIONS_NO_DIRECT_ACCESS)
|
|
|
|
def __len__(self):
|
|
'''Return the number of sections.'''
|
|
return len(self.SECTIONS) - len(self.SECTIONS_NO_DIRECT_ACCESS)
|
|
|
|
@abc.abstractmethod
|
|
def param_schemata(self):
|
|
'''Return a dict of parameters.Schema objects for the parameters.'''
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def parameters(self, stack_identifier, user_params, validate_value=True,
|
|
context=None):
|
|
'''Return a parameters.Parameters object for the stack.'''
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def functions(self):
|
|
'''Return a dict of template functions keyed by name.'''
|
|
pass
|
|
|
|
def parse(self, stack, snippet):
|
|
parse = functools.partial(self.parse, stack)
|
|
|
|
if isinstance(snippet, collections.Mapping):
|
|
if len(snippet) == 1:
|
|
fn_name, args = next(snippet.iteritems())
|
|
Func = self.functions().get(fn_name)
|
|
if Func is not None:
|
|
return Func(stack, fn_name, parse(args))
|
|
return dict((k, parse(v)) for k, v in snippet.iteritems())
|
|
elif (not isinstance(snippet, basestring) and
|
|
isinstance(snippet, collections.Iterable)):
|
|
return [parse(v) for v in snippet]
|
|
else:
|
|
return snippet
|