proxmox-backup/src/backup/read_chunk.rs

45 lines
1.1 KiB
Rust

use failure::*;
use std::sync::Arc;
use super::datastore::*;
use super::crypt_config::*;
use super::data_blob::*;
/// The ReadChunk trait allows reading backup data chunks (local or remote)
pub trait ReadChunk {
/// Returns the decoded chunk data
fn read_chunk(&mut self, digest:&[u8; 32]) -> Result<Vec<u8>, Error>;
}
pub struct LocalChunkReader {
store: Arc<DataStore>,
crypt_config: Option<Arc<CryptConfig>>,
}
impl LocalChunkReader {
pub fn new(store: Arc<DataStore>, crypt_config: Option<Arc<CryptConfig>>) -> Self {
Self { store, crypt_config }
}
}
impl ReadChunk for LocalChunkReader {
fn read_chunk(&mut self, digest:&[u8; 32]) -> Result<Vec<u8>, Error> {
let digest_str = proxmox::tools::digest_to_hex(digest);
println!("READ CHUNK {}", digest_str);
let (path, _) = self.store.chunk_path(digest);
let raw_data = proxmox::tools::fs::file_get_contents(&path)?;
let chunk = DataBlob::from_raw(raw_data)?;
chunk.verify_crc()?;
let raw_data = chunk.decode(self.crypt_config.as_ref().map(Arc::as_ref))?;
// fixme: verify digest?
Ok(raw_data)
}
}