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