72 lines
2.7 KiB
Python
72 lines
2.7 KiB
Python
# Copyright 2019 NetApp, Inc.
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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 oslo_log import log
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from manila.scheduler.filters import base_host
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from manila.share import utils as share_utils
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LOG = log.getLogger(__name__)
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class CreateFromSnapshotFilter(base_host.BaseHostFilter):
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"""CreateFromSnapshotFilter filters hosts based on replication_domain."""
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def host_passes(self, host_state, filter_properties):
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"""Return True if new share's host is compatible with snapshot's host.
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Design of this filter:
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- Creating shares from snapshots in another pool or backend needs
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to match with one of the below conditions:
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- The backend of the new share must be the same as its parent
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snapshot.
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- Both new share and snapshot are in the same replication_domain
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"""
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snapshot_id = filter_properties.get('request_spec', {}).get(
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'snapshot_id')
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snapshot_host = filter_properties.get(
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'request_spec', {}).get('snapshot_host')
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if None in [snapshot_id, snapshot_host]:
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# NOTE(silvacarlose): if the request does not contain a snapshot_id
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# or a snapshot_host, the user is not creating a share from a
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# snapshot and we don't need to filter out the host.
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return True
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snapshot_backend = share_utils.extract_host(snapshot_host, 'backend')
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snapshot_rep_domain = filter_properties.get('replication_domain')
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host_backend = share_utils.extract_host(host_state.host, 'backend')
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host_rep_domain = host_state.replication_domain
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# Same backend
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if host_backend == snapshot_backend:
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return True
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# Same replication domain
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if snapshot_rep_domain and snapshot_rep_domain == host_rep_domain:
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return True
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msg = ("The parent's snapshot %(snapshot_id)s back end and "
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"replication domain don't match with the back end and "
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"replication domain of the Host %(host)s.")
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kwargs = {
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"snapshot_id": snapshot_id,
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"host": host_state.host
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}
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LOG.debug(msg, kwargs)
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return False
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