0885397d10
Initial PoC source code for Tricircle, the project for OpenStack cascading solution. Change-Id: I8abc93839a26446cb61c8d9004dfd812bd91de6e
96 lines
2.8 KiB
Python
96 lines
2.8 KiB
Python
# Copyright (c) 2014 OpenStack Foundation.
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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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#
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# @author: Jia Dong, HuaWei
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import logging
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import urlparse
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from stevedore import extension
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LOG = logging.getLogger(__name__)
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class LocationCreator(object):
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def __init__(self):
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self.scheme = None
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def creator(self, **kwargs):
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pass
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class Location(object):
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"""
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Class describing the location of an image that Glance knows about
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"""
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def __init__(self, store_name, store_location_class,
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uri=None, image_id=None, store_specs=None):
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"""
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Create a new Location object.
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:param store_name: The string identifier/scheme of the storage backend
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:param store_location_class: The store location class to use
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for this location instance.
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:param image_id: The identifier of the image in whatever storage
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backend is used.
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:param uri: Optional URI to construct location from
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:param store_specs: Dictionary of information about the location
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of the image that is dependent on the backend
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store
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"""
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self.store_name = store_name
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self.image_id = image_id
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self.store_specs = store_specs or {}
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self.store_location = store_location_class(self.store_specs)
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class StoreLocation(object):
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"""
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Base class that must be implemented by each store
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"""
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def __init__(self, store_specs):
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self.specs = store_specs
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if self.specs:
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self.process_specs()
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class LocationFactory(object):
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SYNC_LOCATION_NAMESPACE = "glance.sync.store.location"
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def __init__(self):
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self._locations = {}
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self._load_locations()
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def _load_locations(self):
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extension_manager = extension.ExtensionManager(
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namespace=self.SYNC_LOCATION_NAMESPACE,
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invoke_on_load=True,
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)
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for ext in extension_manager:
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if ext.name in self._locations:
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continue
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ext.obj.name = ext.name
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self._locations[ext.name] = ext.obj
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def get_instance(self, scheme, **kwargs):
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loc_creator = self._locations.get(scheme, None)
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return loc_creator.create(**kwargs)
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