68 lines
1.5 KiB
Python
68 lines
1.5 KiB
Python
import asyncio
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import os
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from typing import IO
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DEFAULT_CHUNK = 8 * 1024 * 1024
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_blake3 = None
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def _get_blake3():
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global _blake3
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if _blake3 is None:
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try:
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from blake3 import blake3 as _b3
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_blake3 = _b3
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except ImportError:
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raise ImportError(
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"blake3 is required for asset hashing. Install with: pip install blake3"
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)
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return _blake3
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def compute_blake3_hash(
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fp: str | IO[bytes],
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chunk_size: int = DEFAULT_CHUNK,
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) -> str:
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if hasattr(fp, "read"):
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return _hash_file_obj(fp, chunk_size)
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with open(os.fspath(fp), "rb") as f:
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return _hash_file_obj(f, chunk_size)
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async def compute_blake3_hash_async(
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fp: str | IO[bytes],
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chunk_size: int = DEFAULT_CHUNK,
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) -> str:
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if hasattr(fp, "read"):
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return await asyncio.to_thread(compute_blake3_hash, fp, chunk_size)
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def _worker() -> str:
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with open(os.fspath(fp), "rb") as f:
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return _hash_file_obj(f, chunk_size)
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return await asyncio.to_thread(_worker)
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def _hash_file_obj(file_obj: IO, chunk_size: int = DEFAULT_CHUNK) -> str:
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if chunk_size <= 0:
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chunk_size = DEFAULT_CHUNK
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orig_pos = file_obj.tell()
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try:
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if orig_pos != 0:
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file_obj.seek(0)
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h = _get_blake3()()
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while True:
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chunk = file_obj.read(chunk_size)
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if not chunk:
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break
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h.update(chunk)
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return h.hexdigest()
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finally:
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if orig_pos != 0:
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file_obj.seek(orig_pos)
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