Source code for heat.engine.attributes

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#    Licensed under the Apache License, Version 2.0 (the "License"); you may
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#         http://www.apache.org/licenses/LICENSE-2.0
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import collections


class Attribute(object):
[docs] """ An Attribute schema. """ (DESCRIPTION,) = ('description',) def __init__(self, attr_name, description): """ Initialise with a name and description. :param attr_name: the name of the attribute :param description: attribute description """ self.name = attr_name self.description = description def as_output(self, resource_name):
[docs] """ Return an Output schema entry for a provider template with the given resource name. :param resource_name: the logical name of the provider resource :returns: This attribute as a template 'Output' entry """ return { "Value": '{"Fn::GetAtt": ["%s", "%s"]}' % (resource_name, self.name), "Description": self.description } class Attributes(collections.Mapping):
[docs] """Models a collection of Resource Attributes.""" def __init__(self, res_name, schema, resolver): self._resource_name = res_name self._resolver = resolver self._attributes = Attributes._make_attributes(schema) @staticmethod def _make_attributes(schema): return dict((n, Attribute(n, d)) for n, d in schema.items()) @staticmethod def as_outputs(resource_name, resource_class):
[docs] """ :param resource_name: logical name of the resource :param resource_class: resource implementation class :returns: The attributes of the specified resource_class as a template Output map """ schema = resource_class.attributes_schema attribs = Attributes._make_attributes(schema).items() return dict((n, att.as_output(resource_name)) for n, att in attribs) @staticmethod
def schema_from_outputs(json_snippet):
[docs] if json_snippet: return dict((k, v.get("Description")) for k, v in json_snippet.items()) return {} def __getitem__(self, key):
if key not in self: raise KeyError(_('%(resource)s: Invalid attribute %(key)s') % dict(resource=self._resource_name, key=key)) return self._resolver(key) def __len__(self): return len(self._attributes) def __contains__(self, key): return key in self._attributes def __iter__(self): return iter(self._attributes) def __repr__(self): return ("Attributes for %s:\n\t" % self._resource_name + '\n\t'.join(self._attributes.values()))