87 lines
1.9 KiB
Rust
87 lines
1.9 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 crate::background::BackgroundRunner;
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use crate::data::*;
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use crate::table::*;
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#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
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pub struct Version {
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// Primary key
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pub uuid: UUID,
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// Actual data: the blocks for this version
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pub deleted: bool,
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pub blocks: Vec<VersionBlock>,
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// Back link to bucket+key so that we can figure if
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// this was deleted later on
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pub bucket: String,
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pub key: String,
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}
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#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
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pub struct VersionBlock {
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pub offset: u64,
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pub hash: Hash,
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}
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impl Entry<Hash, EmptySortKey> for Version {
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fn partition_key(&self) -> &Hash {
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&self.uuid
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}
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fn sort_key(&self) -> &EmptySortKey {
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&EmptySortKey
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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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self.blocks.clear();
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} else if !self.deleted {
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for bi in other.blocks.iter() {
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match self.blocks.binary_search_by(|x| x.offset.cmp(&bi.offset)) {
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Ok(_) => (),
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Err(pos) => {
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self.blocks.insert(pos, bi.clone());
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}
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}
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}
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}
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}
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}
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pub struct VersionTable {
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pub background: Arc<BackgroundRunner>,
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pub block_ref_table: Arc<Table<BlockRefTable>>,
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}
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#[async_trait]
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impl TableFormat for VersionTable {
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type P = Hash;
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type S = EmptySortKey;
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type E = Version;
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async fn updated(&self, old: Option<Self::E>, new: Self::E) {
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let block_ref_table = self.block_ref_table.clone();
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self.background.spawn(async move {
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// Propagate deletion of version blocks
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if let Some(old_v) = old {
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if new.deleted && !old_v.deleted {
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let deleted_block_refs = old_v
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.blocks
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.iter()
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.map(|vb| BlockRef {
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block: vb.hash.clone(),
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version: old_v.uuid.clone(),
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deleted: true,
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})
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.collect::<Vec<_>>();
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block_ref_table.insert_many(&deleted_block_refs[..]).await?;
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}
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}
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Ok(())
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});
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}
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}
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