49 lines
1.5 KiB
Python
49 lines
1.5 KiB
Python
# Copyright 2020 Catalyst Cloud
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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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class Storage(object):
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"""Base class for Storage driver implementation."""
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@abc.abstractmethod
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def save(self, stream, metadata=None, **kwargs):
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"""Persist information from the stream.
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Should return the new backup checkshum and location.
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"""
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@abc.abstractmethod
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def load(self, location, backup_checksum, **kwargs):
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"""Load a stream from the data location.
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Should return an object that provides "read" method.
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"""
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def load_metadata(self, parent_location, parent_checksum):
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"""Load metadata for a parent backup.
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It's up to the storage driver to decide how to implement this function.
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"""
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return {}
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def is_incremental_backup(self, location):
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"""Check if the location is an incremental backup."""
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return False
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@abc.abstractmethod
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def get_backup_lsn(self, location):
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"""Get the backup LSN."""
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