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use serde::{Deserialize, Serialize};
use std::sync::Arc;
use garage_db as db;
use garage_util::data::*;
use garage_table::crdt::Crdt;
use garage_table::*;
use garage_block::manager::*;
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct BlockRef {
/// Hash (blake2 sum) of the block, used as partition key
pub block: Hash,
/// Id of the Version for the object containing this block, used as sorting key
pub version: Uuid,
// Keep track of deleted status
/// Is the Version that contains this block deleted
pub deleted: crdt::Bool,
}
impl Entry<Hash, Uuid> for BlockRef {
fn partition_key(&self) -> &Hash {
&self.block
}
fn sort_key(&self) -> &Uuid {
&self.version
}
fn is_tombstone(&self) -> bool {
self.deleted.get()
}
}
impl Crdt for BlockRef {
fn merge(&mut self, other: &Self) {
self.deleted.merge(&other.deleted);
}
}
pub struct BlockRefTable {
pub block_manager: Arc<BlockManager>,
}
impl TableSchema for BlockRefTable {
const TABLE_NAME: &'static str = "block_ref";
type P = Hash;
type S = Uuid;
type E = BlockRef;
type Filter = DeletedFilter;
fn updated(
&self,
tx: &mut db::Transaction,
old: Option<&Self::E>,
new: Option<&Self::E>,
) -> db::TxOpResult<()> {
let block = old.or(new).unwrap().block;
let was_before = old.map(|x| !x.deleted.get()).unwrap_or(false);
let is_after = new.map(|x| !x.deleted.get()).unwrap_or(false);
if is_after && !was_before {
self.block_manager.block_incref(tx, block)?;
}
if was_before && !is_after {
self.block_manager.block_decref(tx, block)?;
}
Ok(())
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
filter.apply(entry.deleted.get())
}
}
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