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Optimize hashing calculation of large files #322

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10 changes: 8 additions & 2 deletions py/model_info.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,13 @@
import os


def calculate_hash(filepath, chunksize=1024*1024):
sha256_hash = hashlib.sha256()
with open(filepath, "rb") as f:
while chunk := f.read(chunksize):
sha256_hash.update(chunk)
return sha256_hash.hexdigest()

def get_metadata(filepath):
with open(filepath, "rb") as file:
# https://github.com/huggingface/safetensors#format
Expand Down Expand Up @@ -107,8 +114,7 @@ async def load_metadata(request):
with open(hash_file, "rt") as f:
meta["pysssss.sha256"] = f.read()
else:
with open(file_path, "rb") as f:
meta["pysssss.sha256"] = hashlib.sha256(f.read()).hexdigest()
meta["pysssss.sha256"] = calculate_hash(file_path)
with open(hash_file, "wt") as f:
f.write(meta["pysssss.sha256"])

Expand Down