112 lines
3.5 KiB
Python
112 lines
3.5 KiB
Python
# (c) Copyright 2016 Hewlett-Packard Enterprise Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import abc
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import os
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import six
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from freezer.storage import base
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from freezer.utils import utils
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@six.add_metaclass(abc.ABCMeta)
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class PhysicalStorage(base.Storage):
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"""
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Backup like Swift, SSH or Local. Something that represents real storage.
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For example MultipleStorage is not physical.
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"""
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def __init__(self, storage_path, max_segment_size,
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skip_prepare=False):
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self.storage_path = storage_path
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self.max_segment_size = max_segment_size
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super(PhysicalStorage, self).__init__(skip_prepare=skip_prepare)
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def metadata_path(self, engine, hostname_backup_name):
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return utils.path_join(self.storage_path, "metadata", engine.name,
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hostname_backup_name)
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def get_level_zero(self,
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engine,
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hostname_backup_name,
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recent_to_date=None):
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"""
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Gets backups by backup_name and hostname
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:type engine: freezer.engine.engine.BackupEngine
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:param engine: Search for backups made by specified engine
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:type hostname_backup_name: str
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:param hostname_backup_name: Search for backup with specified name
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:type recent_to_date: int
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:param recent_to_date:
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:rtype: list[freezer.storage.base.Backup]
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:return: dictionary of level zero timestamps with attached storage
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"""
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path = self.metadata_path(
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engine=engine,
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hostname_backup_name=hostname_backup_name)
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zeros = [base.Backup(
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storage=self,
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engine=engine,
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hostname_backup_name=hostname_backup_name,
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level_zero_timestamp=int(t),
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timestamp=int(t),
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level=0) for t in self.listdir(path)]
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if recent_to_date:
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zeros = [zero for zero in zeros
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if zero.timestamp <= recent_to_date]
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return zeros
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@abc.abstractmethod
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def backup_blocks(self, backup):
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"""
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:param backup:
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:type backup: freezer.storage.base.Backup
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:return:
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"""
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pass
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@abc.abstractmethod
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def listdir(self, path):
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"""
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:type path: str
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:param path:
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:rtype: collections.Iterable[str]
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"""
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pass
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def put_metadata(self,
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engine_metadata_path,
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freezer_metadata_path,
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backup):
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"""
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:param engine_metadata_path:
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:param freezer_metadata_path:
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:type backup: freezer.storage.base.Backup
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:param backup:
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:return:
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"""
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backup = backup.copy(self)
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self.put_file(engine_metadata_path, backup.engine_metadata_path)
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self.create_dirs(os.path.dirname(backup.metadata_path))
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self.put_file(freezer_metadata_path, backup.metadata_path)
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@abc.abstractmethod
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def rmtree(self, path):
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pass
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