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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 tempfile
from contextlib import contextmanager
from pathlib import Path
from typing import Generator, Union
from urllib.request import urlopen
from cosmos_predict1.utils.easy_io.backends.base_backend import BaseStorageBackend
class HTTPBackend(BaseStorageBackend):
"""HTTP and HTTPS storage bachend."""
def get(self, filepath: str) -> bytes:
"""Read bytes from a given ``filepath``.
Args:
filepath (str): Path to read data.
Returns:
bytes: Expected bytes object.
Examples:
>>> backend = HTTPBackend()
>>> backend.get('http://path/of/file')
b'hello world'
"""
return urlopen(filepath).read()
def get_text(self, filepath, encoding="utf-8") -> str:
"""Read text from a given ``filepath``.
Args:
filepath (str): Path to read data.
encoding (str): The encoding format used to open the ``filepath``.
Defaults to 'utf-8'.
Returns:
str: Expected text reading from ``filepath``.
Examples:
>>> backend = HTTPBackend()
>>> backend.get_text('http://path/of/file')
'hello world'
"""
return urlopen(filepath).read().decode(encoding)
@contextmanager
def get_local_path(self, filepath: str) -> Generator[Union[str, Path], None, None]:
"""Download a file from ``filepath`` to a local temporary directory,
and return the temporary path.
``get_local_path`` is decorated by :meth:`contxtlib.contextmanager`. It
can be called with ``with`` statement, and when exists from the
``with`` statement, the temporary path will be released.
Args:
filepath (str): Download a file from ``filepath``.
Yields:
Iterable[str]: Only yield one temporary path.
Examples:
>>> backend = HTTPBackend()
>>> # After existing from the ``with`` clause,
>>> # the path will be removed
>>> with backend.get_local_path('http://path/of/file') as path:
... # do something here
"""
try:
f = tempfile.NamedTemporaryFile(delete=False)
f.write(self.get(filepath))
f.close()
yield f.name
finally:
os.remove(f.name)
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