131 lines
2.8 KiB
Rust
131 lines
2.8 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::error::Error;
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use crate::table::table_sharded::*;
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use crate::table::*;
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use crate::store::block_ref_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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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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impl Version {
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pub fn new(
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uuid: UUID,
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bucket: String,
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key: String,
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deleted: bool,
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blocks: Vec<VersionBlock>,
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) -> Self {
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let mut ret = Self {
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uuid,
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deleted,
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blocks: vec![],
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bucket,
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key,
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};
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for b in blocks {
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ret.add_block(b)
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.expect("Twice the same VersionBlock in Version constructor");
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}
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ret
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}
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/// Adds a block if it wasn't already present
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pub fn add_block(&mut self, new: VersionBlock) -> Result<(), ()> {
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match self.blocks.binary_search_by(|b| b.offset.cmp(&new.offset)) {
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Err(i) => {
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self.blocks.insert(i, new);
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Ok(())
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}
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Ok(_) => Err(()),
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}
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}
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pub fn blocks(&self) -> &[VersionBlock] {
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&self.blocks[..]
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}
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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, EmptyKey> 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) -> &EmptyKey {
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&EmptyKey
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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, TableShardedReplication>>,
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}
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#[async_trait]
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impl TableSchema for VersionTable {
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type P = Hash;
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type S = EmptyKey;
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type E = Version;
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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_ref_table = self.block_ref_table.clone();
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if let (Some(old_v), Some(new_v)) = (old, new) {
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// Propagate deletion of version blocks
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if new_v.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,
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version: old_v.uuid,
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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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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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