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feat: shard support prefix #23

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@ramwin ramwin commented Oct 6, 2024

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ramwin commented Oct 11, 2024

@dgilland could you review this pull request on your spare time?

def shard(digest, depth, width):
# This creates a list of `depth` number of tokens with width
# `width` from the first part of the id plus the remainder.
def shard(digest, depth, width, prefix="") -> List[str]:
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This method is an internal utility that's not meant for direct usage outside the library. It's meant to be passed a hash's HEX digest which then generates a file path. So a prefix argument doesn't make sense within that context.

I don't see the new prefix argument being used anywhere within the library so curious what the desire is here? Are you using shard() directly or have some other usage in mind?

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Yes, I want to use shard only in my python code.
Here was the scenario. I have a export task run in backend. It will generate a file name export_0x<uuid>.csv.
In order to prevent create huge amounts of file in one single directory. I use shard to create the file path.

import uuid
from hashfs.utils import shard
target_destination = Path(shard(
    f"export_0x{uuid.uuid4().hex}.csv",
    prefix="export_0x",
    depth=2, width=2))

Now the directory already contains thousands of file, I want to distribute them into sub directorys.

for f in list(Path("").iterdir()):
    f.rename(shard(f.name, prefix="export_0x"))

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In that case, I'd suggest copy/pasting the function into your own code instead of relying on this library for it.

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