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 } }