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use data_encoding::BASE64;
use std::{
collections::HashMap,
sync::{Arc, RwLock},
};
use tracing::instrument;
use crate::Error;
use super::ChunkService;
#[derive(Clone, Default)]
pub struct MemoryChunkService {
db: Arc<RwLock<HashMap<[u8; 32], Vec<u8>>>>,
}
impl ChunkService for MemoryChunkService {
#[instrument(skip(self, digest), fields(chunk.digest=BASE64.encode(digest)))]
fn has(&self, digest: &[u8; 32]) -> Result<bool, Error> {
let db = self.db.read().unwrap();
Ok(db.get(digest).is_some())
}
#[instrument(skip(self), fields(chunk.digest=BASE64.encode(digest)))]
fn get(&self, digest: &[u8; 32]) -> Result<Option<Vec<u8>>, Error> {
let db = self.db.read().unwrap();
match db.get(digest) {
None => Ok(None),
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(data.clone()))
}
}
}
#[instrument(skip(self, data))]
fn put(&self, data: Vec<u8>) -> Result<[u8; 32], Error> {
let digest = blake3::hash(&data);
let mut db = self.db.write().unwrap();
db.insert(*digest.as_bytes(), data);
Ok(*digest.as_bytes())
}
}
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