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use std::path::PathBuf;
use data_encoding::BASE64;
use tracing::instrument;
use crate::Error;
use super::ChunkService;
#[derive(Clone)]
pub struct SledChunkService {
db: sled::Db,
}
impl SledChunkService {
pub fn new(p: PathBuf) -> Result<Self, sled::Error> {
let config = sled::Config::default().use_compression(true).path(p);
let db = config.open()?;
Ok(Self { db })
}
pub fn new_temporary() -> Result<Self, sled::Error> {
let config = sled::Config::default().temporary(true);
let db = config.open()?;
Ok(Self { db })
}
}
impl ChunkService for SledChunkService {
#[instrument(name = "SledChunkService::has", skip(self, digest), fields(chunk.digest=BASE64.encode(digest)))]
fn has(&self, digest: &[u8; 32]) -> Result<bool, Error> {
match self.db.get(digest) {
Ok(None) => Ok(false),
Ok(Some(_)) => Ok(true),
Err(e) => Err(Error::StorageError(e.to_string())),
}
}
#[instrument(name = "SledChunkService::get", skip(self), fields(chunk.digest=BASE64.encode(digest)))]
fn get(&self, digest: &[u8; 32]) -> Result<Option<Vec<u8>>, Error> {
match self.db.get(digest) {
Ok(None) => Ok(None),
Ok(Some(data)) => {
// calculate the hash to verify this is really what we expect
let actual_digest = blake3::hash(&data).as_bytes().to_vec();
if actual_digest != digest {
return Err(Error::StorageError(format!(
"invalid hash encountered when reading chunk, expected {}, got {}",
BASE64.encode(digest),
BASE64.encode(&actual_digest),
)));
}
Ok(Some(Vec::from(&*data)))
}
Err(e) => Err(Error::StorageError(e.to_string())),
}
}
#[instrument(name = "SledChunkService::put", skip(self, data))]
fn put(&self, data: Vec<u8>) -> Result<[u8; 32], Error> {
let digest = blake3::hash(&data);
let result = self.db.insert(digest.as_bytes(), data);
if let Err(e) = result {
return Err(Error::StorageError(e.to_string()));
}
Ok(*digest.as_bytes())
}
}
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