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# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# 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 os
import os.path as osp
from abc import ABCMeta, abstractmethod
def mkdir_or_exist(dir_name, mode=0o777):
if dir_name == "":
return
dir_name = osp.expanduser(dir_name)
os.makedirs(dir_name, mode=mode, exist_ok=True)
def has_method(obj, method):
return hasattr(obj, method) and callable(getattr(obj, method))
class BaseStorageBackend(metaclass=ABCMeta):
"""Abstract class of storage backends.
All backends need to implement two apis: :meth:`get()` and
:meth:`get_text()`.
- :meth:`get()` reads the file as a byte stream.
- :meth:`get_text()` reads the file as texts.
"""
# a flag to indicate whether the backend can create a symlink for a file
# This attribute will be deprecated in future.
_allow_symlink = False
@property
def allow_symlink(self):
return self._allow_symlink
@property
def name(self):
return self.__class__.__name__
@abstractmethod
def get(self, filepath):
pass
@abstractmethod
def get_text(self, filepath):
pass
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