89 lines
2.6 KiB
Python
89 lines
2.6 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 cPickle as pickle
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import os.path
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import random
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from nova import exception
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from nova.image import service
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class LocalImageService(service.BaseImageService):
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"""Image service storing images to local disk.
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It assumes that image_ids are integers."""
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def __init__(self):
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self._path = "/tmp/nova/images"
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try:
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os.makedirs(self._path)
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except OSError: # Exists
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pass
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def _path_to(self, image_id):
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return os.path.join(self._path, str(image_id))
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def _ids(self):
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"""The list of all image ids."""
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return [int(i) for i in os.listdir(self._path)]
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def index(self, context):
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return [dict(id=i['id'], name=i['name']) for i in self.detail(context)]
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def detail(self, context):
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return [self.show(context, id) for id in self._ids()]
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def show(self, context, id):
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try:
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return pickle.load(open(self._path_to(id)))
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except IOError:
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raise exception.NotFound
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def create(self, context, data):
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"""
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Store the image data and return the new image id.
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"""
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id = random.randint(0, 2 ** 31 - 1)
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data['id'] = id
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self.update(context, id, data)
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return id
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def update(self, context, image_id, data):
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"""Replace the contents of the given image with the new data."""
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try:
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pickle.dump(data, open(self._path_to(image_id), 'w'))
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except IOError:
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raise exception.NotFound
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def delete(self, context, image_id):
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"""
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Delete the given image. Raises OSError if the image does not exist.
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"""
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try:
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os.unlink(self._path_to(image_id))
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except IOError:
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raise exception.NotFound
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def delete_all(self):
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"""
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Clears out all images in local directory
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"""
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for id in self._ids():
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os.unlink(self._path_to(id))
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