84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 OpenStack, LLC
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# All Rights Reserved.
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#
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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 httplib
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import json
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import urlparse
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from glance import client
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class ImageRegistryException(Exception):
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""" Base class for all RegistryAdapter exceptions """
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pass
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class UnknownImageRegistry(ImageRegistryException):
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""" Raised if we don't recognize the requested Registry protocol """
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pass
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class ImageRegistry(object):
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""" Base class for all image endpoints """
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@classmethod
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def lookup(cls, parsed_uri):
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""" Subclasses must define a lookup method which returns an dictionary
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representing the image.
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"""
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raise NotImplementedError
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class Parallax(ImageRegistry):
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"""
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Parallax stuff
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"""
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@classmethod
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def lookup(cls, image_id):
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"""
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Takes an image ID and checks if that image is registered in Parallax,
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and if so, returns the image metadata. If the image does not exist,
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we raise NotFound
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"""
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# TODO(jaypipes): Make parallax client configurable via options.
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# Unfortunately, the decision to make all adapters have no state
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# hinders this...
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c = client.ParallaxClient()
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return c.get_image(image_id)
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REGISTRY_ADAPTERS = {
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'parallax': Parallax
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}
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def lookup_by_registry(registry, image_id):
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"""
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Convenience function to lookup image metadata for the given
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opaque image identifier and registry.
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:param registry: String name of registry to use for lookups
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:param image_id: Opaque image identifier
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"""
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try:
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adapter = REGISTRY_ADAPTERS[registry]
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except KeyError:
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raise UnknownImageRegistry("'%s' not found" % registry)
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return adapter.lookup(image_id)
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