111 lines
3.9 KiB
Python
111 lines
3.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright (c) 2012, Intel Performance Learning Solutions Ltd.
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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 uuid
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from occi import backend
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from occi.extensions import infrastructure
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from webob import exc
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from nova import compute
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from nova import log as logging
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from nova import volume
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#Hi I'm a logger, use me! :-)
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LOG = logging.getLogger('nova.api.occi.backends.storage.link')
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class StorageLinkBackend(backend.KindBackend):
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"""
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A backend for the storage links.
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"""
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def __init__(self):
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super(StorageLinkBackend, self).__init__()
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self.volume_api = volume.API()
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self.compute_api = compute.API()
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def create(self, link, extras):
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"""
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Creates a link from a compute instance to a storage volume.
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The user must specify what the device id is to be.
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"""
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msg = _('Linking compute to storage via StorageLink.')
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LOG.info(msg)
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inst_to_attach = self._get_inst_to_attach(extras['nova_ctx'], link)
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vol_to_attach = self._get_vol_to_attach(extras['nova_ctx'], link)
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self.compute_api.attach_volume(
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extras['nova_ctx'],
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inst_to_attach,
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vol_to_attach['id'],
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link.attributes['occi.storagelink.deviceid'])
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link.attributes['occi.core.id'] = str(uuid.uuid4())
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link.attributes['occi.storagelink.deviceid'] = \
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link.attributes['occi.storagelink.deviceid']
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link.attributes['occi.storagelink.mountpoint'] = ''
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link.attributes['occi.storagelink.state'] = 'active'
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def _get_inst_to_attach(self, context, link):
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"""
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Gets the compute instance that is to have the storage attached.
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"""
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if link.target.kind == infrastructure.COMPUTE:
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instance = self.compute_api.get(context,
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link.target.attributes['occi.core.id'])
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elif link.source.kind == infrastructure.COMPUTE:
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instance = self.compute_api.get(context,
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link.source.attributes['occi.core.id'])
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else:
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raise exc.HTTPBadRequest()
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return instance
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def _get_vol_to_attach(self, context, link):
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"""
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Gets the storage instance that is to have the compute attached.
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"""
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if link.target.kind == infrastructure.STORAGE:
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vol_to_attach = self.volume_api.get(context,
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link.target.attributes['occi.core.id'])
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elif link.source.kind == infrastructure.STORAGE:
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vol_to_attach = self.volume_api.get(context,
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link.source.attributes['occi.core.id'])
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else:
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raise exc.HTTPBadRequest()
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return vol_to_attach
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def delete(self, link, extras):
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"""
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Unlinks the the compute from the storage resource.
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"""
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msg = _('Unlinking entity from storage via StorageLink.')
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LOG.info(msg)
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try:
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vol_to_detach = self._get_vol_to_attach(extras['nova_ctx'], link)
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self.compute_api.detach_volume(extras['nova_ctx'],
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vol_to_detach['id'])
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except Exception, e:
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msg = _('Error in detaching storage volume.')
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LOG.error(msg)
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raise e
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