89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
#!/usr/bin/env python
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# Copyright 2024 Bytedance Ltd. and/or its affiliates
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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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# -*- coding: utf-8 -*-
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"""File-system agnostic IO APIs"""
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import os
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import tempfile
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import hashlib
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from .hdfs_io import copy, makedirs, exists
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__all__ = ["copy", "exists", "makedirs"]
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_HDFS_PREFIX = "hdfs://"
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def _is_non_local(path):
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return path.startswith(_HDFS_PREFIX)
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def md5_encode(path: str) -> str:
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return hashlib.md5(path.encode()).hexdigest()
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def get_local_temp_path(hdfs_path: str, cache_dir: str) -> str:
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"""Return a local temp path that joins cache_dir and basename of hdfs_path
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Args:
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hdfs_path:
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cache_dir:
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Returns:
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"""
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# make a base64 encoding of hdfs_path to avoid directory conflict
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encoded_hdfs_path = md5_encode(hdfs_path)
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temp_dir = os.path.join(cache_dir, encoded_hdfs_path)
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os.makedirs(temp_dir, exist_ok=True)
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dst = os.path.join(temp_dir, os.path.basename(hdfs_path))
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return dst
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def copy_local_path_from_hdfs(src: str, cache_dir=None, filelock='.file.lock', verbose=False) -> str:
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"""Copy src from hdfs to local if src is on hdfs or directly return src.
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If cache_dir is None, we will use the default cache dir of the system. Note that this may cause conflicts if
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the src name is the same between calls
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Args:
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src (str): a HDFS path of a local path
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Returns:
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a local path of the copied file
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"""
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from filelock import FileLock
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assert src[-1] != '/', f'Make sure the last char in src is not / because it will cause error. Got {src}'
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if _is_non_local(src):
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# download from hdfs to local
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if cache_dir is None:
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# get a temp folder
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cache_dir = tempfile.gettempdir()
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os.makedirs(cache_dir, exist_ok=True)
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assert os.path.exists(cache_dir)
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local_path = get_local_temp_path(src, cache_dir)
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# get a specific lock
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filelock = md5_encode(src) + '.lock'
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lock_file = os.path.join(cache_dir, filelock)
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with FileLock(lock_file=lock_file):
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if not os.path.exists(local_path):
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if verbose:
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print(f'Copy from {src} to {local_path}')
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copy(src, local_path)
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return local_path
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else:
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return src
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