96 lines
2.5 KiB
Rust
96 lines
2.5 KiB
Rust
use std::future::Future;
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use std::pin::Pin;
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use std::sync::Arc;
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use anyhow::Error;
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use super::crypt_config::CryptConfig;
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use super::data_blob::DataBlob;
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use super::datastore::DataStore;
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/// The ReadChunk trait allows reading backup data chunks (local or remote)
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pub trait ReadChunk {
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/// Returns the encoded chunk data
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fn read_raw_chunk(&self, digest: &[u8; 32]) -> Result<DataBlob, Error>;
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/// Returns the decoded chunk data
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fn read_chunk(&self, digest: &[u8; 32]) -> Result<Vec<u8>, Error>;
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}
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#[derive(Clone)]
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pub struct LocalChunkReader {
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store: Arc<DataStore>,
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crypt_config: Option<Arc<CryptConfig>>,
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}
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impl LocalChunkReader {
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pub fn new(store: Arc<DataStore>, crypt_config: Option<Arc<CryptConfig>>) -> Self {
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Self {
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store,
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crypt_config,
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}
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}
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}
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impl ReadChunk for LocalChunkReader {
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fn read_raw_chunk(&self, digest: &[u8; 32]) -> Result<DataBlob, Error> {
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self.store.load_chunk(digest)
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}
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fn read_chunk(&self, digest: &[u8; 32]) -> Result<Vec<u8>, Error> {
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let chunk = ReadChunk::read_raw_chunk(self, digest)?;
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let raw_data = chunk.decode(self.crypt_config.as_ref().map(Arc::as_ref))?;
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// fixme: verify digest?
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Ok(raw_data)
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}
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}
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pub trait AsyncReadChunk: Send {
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/// Returns the encoded chunk data
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fn read_raw_chunk<'a>(
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&'a self,
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digest: &'a [u8; 32],
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) -> Pin<Box<dyn Future<Output = Result<DataBlob, Error>> + Send + 'a>>;
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/// Returns the decoded chunk data
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fn read_chunk<'a>(
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&'a self,
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digest: &'a [u8; 32],
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) -> Pin<Box<dyn Future<Output = Result<Vec<u8>, Error>> + Send + 'a>>;
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}
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impl AsyncReadChunk for LocalChunkReader {
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fn read_raw_chunk<'a>(
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&'a self,
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digest: &'a [u8; 32],
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) -> Pin<Box<dyn Future<Output = Result<DataBlob, Error>> + Send + 'a>> {
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Box::pin(async move{
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let (path, _) = self.store.chunk_path(digest);
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let raw_data = tokio::fs::read(&path).await?;
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let chunk = DataBlob::load_from_reader(&mut &raw_data[..])?;
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Ok(chunk)
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})
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}
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fn read_chunk<'a>(
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&'a self,
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digest: &'a [u8; 32],
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) -> Pin<Box<dyn Future<Output = Result<Vec<u8>, Error>> + Send + 'a>> {
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Box::pin(async move {
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let chunk = AsyncReadChunk::read_raw_chunk(self, digest).await?;
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let raw_data = chunk.decode(self.crypt_config.as_ref().map(Arc::as_ref))?;
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// fixme: verify digest?
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Ok(raw_data)
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})
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}
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}
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