Sandy Walsh
61 lines
2.1 KiB
Python
61 lines
2.1 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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from nova import exception
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def limited(items, req):
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"""Return a slice of items according to requested offset and limit.
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items - a sliceable
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req - wobob.Request possibly containing offset and limit GET variables.
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offset is where to start in the list, and limit is the maximum number
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of items to return.
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If limit is not specified, 0, or > 1000, defaults to 1000.
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"""
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offset = int(req.GET.get('offset', 0))
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limit = int(req.GET.get('limit', 0))
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if not limit:
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limit = 1000
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limit = min(1000, limit)
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range_end = offset + limit
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return items[offset:range_end]
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def get_image_id_from_image_hash(image_service, context, image_hash):
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"""Given an Image ID Hash, return an objectstore Image ID.
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image_service - reference to objectstore compatible image service.
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context - security context for image service requests.
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image_hash - hash of the image ID.
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"""
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# FIX(sandy): This is terribly inefficient. It pulls all images
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# from objectstore in order to find the match. ObjectStore
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# should have a numeric counterpart to the string ID.
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try:
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items = image_service.detail(context)
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except NotImplementedError:
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items = image_service.index(context)
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for image in items:
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image_id = image['imageId']
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if abs(hash(image_id)) == int(image_hash):
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return image_id
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raise exception.NotFound(image_hash)
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