87 lines
2.4 KiB
Rust
87 lines
2.4 KiB
Rust
use bytes::Bytes;
|
|
use serde::{Deserialize, Serialize};
|
|
use zstd::stream::{decode_all as zstd_decode, Encoder};
|
|
|
|
use garage_util::data::*;
|
|
use garage_util::error::*;
|
|
|
|
/// A possibly compressed block of data
|
|
#[derive(Debug, Serialize, Deserialize)]
|
|
pub enum DataBlock {
|
|
/// Uncompressed data
|
|
Plain(#[serde(with = "serde_bytes")] Vec<u8>),
|
|
/// Data compressed with zstd
|
|
Compressed(#[serde(with = "serde_bytes")] Vec<u8>),
|
|
}
|
|
|
|
impl DataBlock {
|
|
/// Query whether this block is compressed
|
|
pub fn is_compressed(&self) -> bool {
|
|
matches!(self, DataBlock::Compressed(_))
|
|
}
|
|
|
|
/// Get the inner, possibly compressed buffer. You should probably use [`DataBlock::verify_get`]
|
|
/// instead
|
|
pub fn inner_buffer(&self) -> &[u8] {
|
|
use DataBlock::*;
|
|
let (Plain(ref res) | Compressed(ref res)) = self;
|
|
res
|
|
}
|
|
|
|
/// Get the buffer, possibly decompressing it, and verify it's integrity.
|
|
/// For Plain block, data is compared to hash, for Compressed block, zstd checksumming system
|
|
/// is used instead.
|
|
pub fn verify_get(self, hash: Hash) -> Result<Vec<u8>, Error> {
|
|
match self {
|
|
DataBlock::Plain(data) => {
|
|
if blake2sum(&data) == hash {
|
|
Ok(data)
|
|
} else {
|
|
Err(Error::CorruptData(hash))
|
|
}
|
|
}
|
|
DataBlock::Compressed(data) => {
|
|
zstd_decode(&data[..]).map_err(|_| Error::CorruptData(hash))
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Verify data integrity. Allocate less than [`DataBlock::verify_get`] and don't consume self, but
|
|
/// does not return the buffer content.
|
|
pub fn verify(&self, hash: Hash) -> Result<(), Error> {
|
|
match self {
|
|
DataBlock::Plain(data) => {
|
|
if blake2sum(data) == hash {
|
|
Ok(())
|
|
} else {
|
|
Err(Error::CorruptData(hash))
|
|
}
|
|
}
|
|
DataBlock::Compressed(data) => zstd::stream::copy_decode(&data[..], std::io::sink())
|
|
.map_err(|_| Error::CorruptData(hash)),
|
|
}
|
|
}
|
|
|
|
pub async fn from_buffer(data: Bytes, level: Option<i32>) -> DataBlock {
|
|
tokio::task::spawn_blocking(move || {
|
|
if let Some(level) = level {
|
|
if let Ok(data) = zstd_encode(&data[..], level) {
|
|
return DataBlock::Compressed(data);
|
|
}
|
|
}
|
|
DataBlock::Plain(data.to_vec()) // TODO: remove to_vec here
|
|
})
|
|
.await
|
|
.unwrap()
|
|
}
|
|
}
|
|
|
|
fn zstd_encode<R: std::io::Read>(mut source: R, level: i32) -> std::io::Result<Vec<u8>> {
|
|
let mut result = Vec::<u8>::new();
|
|
let mut encoder = Encoder::new(&mut result, level)?;
|
|
encoder.include_checksum(true)?;
|
|
std::io::copy(&mut source, &mut encoder)?;
|
|
encoder.finish()?;
|
|
Ok(result)
|
|
}
|