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# Copyright 2020 Catalyst Cloud
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
class Storage(object):
"""Base class for Storage driver implementation."""
@abc.abstractmethod
def save(self, stream, metadata=None, **kwargs):
"""Persist information from the stream.
Should return the new backup checkshum and location.
"""
@abc.abstractmethod
def load(self, location, backup_checksum, **kwargs):
"""Load a stream from the data location.
Should return an object that provides "read" method.
"""
def load_metadata(self, parent_location, parent_checksum):
"""Load metadata for a parent backup.
It's up to the storage driver to decide how to implement this function.
"""
return {}
def is_incremental_backup(self, location):
"""Check if the location is an incremental backup."""
return False
@abc.abstractmethod
def get_backup_lsn(self, location):
"""Get the backup LSN."""
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