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slice_db.rs
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slice_db.rs
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use std::{collections::BTreeSet, iter::once};
use crate::COL_SLICE;
use super::Storage;
use anyhow::{bail, Result};
use ark_serialize::{CanonicalDeserialize, CanonicalSerialize};
use async_trait::async_trait;
use kvdb::KeyValueDB;
use zg_encoder::{EncodedSlice, LightEncodedSlice};
#[derive(Debug, PartialEq, Eq)]
pub struct SliceIndex {
pub epoch: u64,
pub quorum_id: u64,
pub storage_root: [u8; 32],
pub index: u64,
}
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct BlobInfo {
pub quorum_id: u64,
pub storage_root: [u8; 32],
pub indicies: Vec<u16>,
}
const BLOB_PREFIX: u8 = 0;
const SLICE_PREFIX: u8 = 1;
const DATA_PREFIX: u8 = 2;
impl SliceIndex {
fn to_slice_key(&self) -> Vec<u8> {
self.to_key_with_prefix(SLICE_PREFIX)
}
fn to_data_key(&self) -> Vec<u8> {
self.to_key_with_prefix(DATA_PREFIX)
}
fn to_key_with_prefix(&self, prefix: u8) -> Vec<u8> {
once(prefix)
.chain(self.epoch.to_be_bytes())
.chain(self.quorum_id.to_be_bytes())
.chain(self.storage_root)
.chain(self.index.to_be_bytes())
.collect()
}
}
#[async_trait]
pub trait SliceDB {
async fn get_raw_slice(
&self,
epoch: u64,
quorum_id: u64,
storage_root: [u8; 32],
index: usize,
) -> Result<Option<Vec<u8>>>;
async fn get_slice_data(
&self,
epoch: u64,
quorum_id: u64,
storage_root: [u8; 32],
index: usize,
) -> Result<Option<Vec<[u8; 32]>>>;
async fn get_slice(
&self,
epoch: u64,
quorum_id: u64,
storage_root: [u8; 32],
index: usize,
) -> Result<Option<LightEncodedSlice>>;
async fn put_slice(
&self,
epoch: u64,
quorum_id: u64,
storage_root: [u8; 32],
slices: Vec<EncodedSlice>,
) -> Result<()>;
async fn get_epoch_info(&self, epoch: u64) -> Result<BTreeSet<BlobInfo>>;
}
#[async_trait]
impl SliceDB for Storage {
async fn get_raw_slice(
&self,
epoch: u64,
quorum_id: u64,
storage_root: [u8; 32],
index: usize,
) -> Result<Option<Vec<u8>>> {
let index = SliceIndex {
epoch,
quorum_id,
storage_root,
index: index as u64,
};
if let Some(slice) = self.db.get(COL_SLICE, &index.to_data_key())? {
Ok(Some(slice))
} else {
Ok(None)
}
}
async fn get_slice_data(
&self,
epoch: u64,
quorum_id: u64,
storage_root: [u8; 32],
index: usize,
) -> Result<Option<Vec<[u8; 32]>>> {
let raw_slice = if let Some(slice) = self
.get_raw_slice(epoch, quorum_id, storage_root, index)
.await?
{
slice
} else {
return Ok(None);
};
Ok(Some(
CanonicalDeserialize::deserialize_uncompressed_unchecked(&*raw_slice)?,
))
}
async fn get_slice(
&self,
epoch: u64,
quorum_id: u64,
storage_root: [u8; 32],
index: usize,
) -> Result<Option<LightEncodedSlice>> {
let index = SliceIndex {
epoch,
quorum_id,
storage_root,
index: index as u64,
};
let raw_slice = if let Some(slice) = self.db.get(COL_SLICE, &index.to_slice_key())? {
slice
} else {
return Ok(None);
};
let check = if cfg!(test) {
ark_serialize::Validate::Yes
} else {
ark_serialize::Validate::No
};
// Note: Slice is stored in compressed form
let slice = LightEncodedSlice::deserialize_with_mode(
&*raw_slice,
ark_serialize::Compress::Yes,
check,
)?;
Ok(Some(slice))
}
async fn put_slice(
&self,
epoch: u64,
quorum_id: u64,
storage_root: [u8; 32],
slices: Vec<EncodedSlice>,
) -> Result<()> {
let mut tx = self.db.transaction();
let blob_key: Vec<u8> = once(BLOB_PREFIX)
.chain(epoch.to_be_bytes())
.chain(quorum_id.to_be_bytes())
.chain(storage_root)
.collect();
// TODO: should we consider the update logic here?
let indicies: Vec<u16> = slices.iter().map(|slice| slice.index as u16).collect();
tx.put(COL_SLICE, &blob_key, &bcs::to_bytes(&indicies).unwrap());
for slice in slices.into_iter() {
let index = SliceIndex {
epoch,
quorum_id,
storage_root,
index: slice.index as u64,
};
let data = slice.merkle_row();
let light_slice = slice.into_light_slice();
let mut value: Vec<u8> = Vec::new();
// Note: Slice is stored in compressed form
light_slice.serialize_compressed(&mut value).unwrap();
tx.put(COL_SLICE, &index.to_slice_key(), &value);
let mut value: Vec<u8> = Vec::new();
data.serialize_uncompressed(&mut value).unwrap();
tx.put(COL_SLICE, &index.to_data_key(), &value);
}
self.db.write(tx)?;
Ok(())
}
async fn get_epoch_info(&self, epoch: u64) -> Result<BTreeSet<BlobInfo>> {
let prefix: Vec<u8> = once(BLOB_PREFIX).chain(epoch.to_be_bytes()).collect();
let mut answer = BTreeSet::new();
for item in KeyValueDB::iter_with_prefix(&*self.db, COL_SLICE, &prefix) {
let (key, value) = item?;
if key.len() != 1 + 8 + 8 + 32 {
bail!("Incorrect key format");
}
let mut key_slice = &key.as_ref()[9..];
let quorum_id = {
let (cur, rest) = key_slice.split_at(8);
key_slice = rest;
let cur: &[u8; 8] = cur.try_into().expect("slice with incorrect length");
u64::from_be_bytes(*cur)
};
let storage_root = {
let (cur, rest) = key_slice.split_at(32);
assert!(rest.is_empty());
let cur: &[u8; 32] = cur.try_into().expect("slice with incorrect length");
*cur
};
let indicies: Vec<u16> = bcs::from_bytes(&value)?;
answer.insert(BlobInfo {
quorum_id,
storage_root,
indicies,
});
}
Ok(answer)
}
}