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 { let config = sled::Config::default().use_compression(true).path(p); let db = config.open()?; Ok(Self { db }) } pub fn new_temporary() -> Result { 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]) -> Result { 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]) -> Result>, 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) -> Result, Error> { let digest = blake3::hash(&data).as_bytes().to_vec(); let result = self.db.insert(&digest, data); if let Err(e) = result { return Err(Error::StorageError(e.to_string())); } Ok(digest) } }