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use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use std::sync::Arc;
use garage_util::background::*;
use garage_util::data::*;
use garage_util::error::Error;
use garage_table::*;
use crate::block::*;
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct BlockRef {
// Primary key
pub block: Hash,
// Sort key
pub version: UUID,
// Keep track of deleted status
pub deleted: bool,
}
impl Entry<Hash, UUID> for BlockRef {
fn partition_key(&self) -> &Hash {
&self.block
}
fn sort_key(&self) -> &UUID {
&self.version
}
fn merge(&mut self, other: &Self) {
if other.deleted {
self.deleted = true;
}
}
}
pub struct BlockRefTable {
pub background: Arc<BackgroundRunner>,
pub block_manager: Arc<BlockManager>,
}
#[async_trait]
impl TableSchema for BlockRefTable {
type P = Hash;
type S = UUID;
type E = BlockRef;
type Filter = ();
async fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) -> Result<(), Error> {
let block = &old.as_ref().or(new.as_ref()).unwrap().block;
let was_before = old.as_ref().map(|x| !x.deleted).unwrap_or(false);
let is_after = new.as_ref().map(|x| !x.deleted).unwrap_or(false);
if is_after && !was_before {
self.block_manager.block_incref(block)?;
}
if was_before && !is_after {
self.block_manager.block_decref(block)?;
}
Ok(())
}
fn matches_filter(entry: &Self::E, _filter: &Self::Filter) -> bool {
!entry.deleted
}
}
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