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