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use tracing::{debug, instrument};
use crate::Error;
use super::ChunkService;
/// uploads a chunk to a chunk service, and returns its digest (or an error) when done.
#[instrument(skip_all, err)]
pub fn upload_chunk<CS: ChunkService>(
chunk_service: &CS,
chunk_data: Vec<u8>,
) -> Result<Vec<u8>, Error> {
let mut hasher = blake3::Hasher::new();
update_hasher(&mut hasher, &chunk_data);
let digest = hasher.finalize();
if chunk_service.has(digest.as_bytes())? {
debug!("already has chunk, skipping");
}
let digest_resp = chunk_service.put(chunk_data)?;
assert_eq!(digest_resp, digest.as_bytes());
Ok(digest.as_bytes().to_vec())
}
/// updates a given hasher with more data. Uses rayon if the data is
/// sufficiently big.
///
/// From the docs:
///
/// To get any performance benefit from multithreading, the input buffer needs
/// to be large. As a rule of thumb on x86_64, update_rayon is slower than
/// update for inputs under 128 KiB. That threshold varies quite a lot across
/// different processors, and it’s important to benchmark your specific use
/// case.
///
/// We didn't benchmark yet, so these numbers might need tweaking.
#[instrument(skip_all)]
pub fn update_hasher(hasher: &mut blake3::Hasher, data: &[u8]) {
if data.len() > 128 * 1024 {
hasher.update_rayon(data);
} else {
hasher.update(data);
}
}
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