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use serde::{Deserialize, Serialize};
use std::sync::Arc;
use garage_util::background::BackgroundRunner;
use garage_util::data::*;
use garage_table::crdt::*;
use garage_table::replication::TableShardedReplication;
use garage_table::*;
use crate::block_ref_table::*;
/// A version of an object
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct Version {
/// UUID of the version, used as partition key
pub uuid: Uuid,
// Actual data: the blocks for this version
// In the case of a multipart upload, also store the etags
// of individual parts and check them when doing CompleteMultipartUpload
/// Is this version deleted
pub deleted: crdt::Bool,
/// list of blocks of data composing the version
pub blocks: crdt::Map<VersionBlockKey, VersionBlock>,
/// Etag of each part in case of a multipart upload, empty otherwise
pub parts_etags: crdt::Map<u64, String>,
// Back link to bucket+key so that we can figure if
// this was deleted later on
/// Bucket in which the related object is stored
pub bucket: String,
/// Key in which the related object is stored
pub key: String,
}
impl Version {
pub fn new(uuid: Uuid, bucket: String, key: String, deleted: bool) -> Self {
Self {
uuid,
deleted: deleted.into(),
blocks: crdt::Map::new(),
parts_etags: crdt::Map::new(),
bucket,
key,
}
}
}
#[derive(PartialEq, Eq, Clone, Copy, Debug, Serialize, Deserialize)]
pub struct VersionBlockKey {
/// Number of the part
pub part_number: u64,
/// Offset of this sub-segment in its part
pub offset: u64,
}
impl Ord for VersionBlockKey {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
self.part_number
.cmp(&other.part_number)
.then(self.offset.cmp(&other.offset))
}
}
impl PartialOrd for VersionBlockKey {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
/// Informations about a single block
#[derive(PartialEq, Eq, Ord, PartialOrd, Clone, Copy, Debug, Serialize, Deserialize)]
pub struct VersionBlock {
/// Blake2 sum of the block
pub hash: Hash,
/// Size of the block
pub size: u64,
}
impl AutoCrdt for VersionBlock {
const WARN_IF_DIFFERENT: bool = true;
}
impl Entry<Hash, EmptyKey> for Version {
fn partition_key(&self) -> &Hash {
&self.uuid
}
fn sort_key(&self) -> &EmptyKey {
&EmptyKey
}
fn is_tombstone(&self) -> bool {
self.deleted.get()
}
}
impl Crdt for Version {
fn merge(&mut self, other: &Self) {
self.deleted.merge(&other.deleted);
if self.deleted.get() {
self.blocks.clear();
self.parts_etags.clear();
} else {
self.blocks.merge(&other.blocks);
self.parts_etags.merge(&other.parts_etags);
}
}
}
pub struct VersionTable {
pub background: Arc<BackgroundRunner>,
pub block_ref_table: Arc<Table<BlockRefTable, TableShardedReplication>>,
}
impl TableSchema for VersionTable {
type P = Hash;
type S = EmptyKey;
type E = Version;
type Filter = DeletedFilter;
fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) {
let block_ref_table = self.block_ref_table.clone();
self.background.spawn(async move {
if let (Some(old_v), Some(new_v)) = (old, new) {
// Propagate deletion of version blocks
if new_v.deleted.get() && !old_v.deleted.get() {
let deleted_block_refs = old_v
.blocks
.items()
.iter()
.map(|(_k, vb)| BlockRef {
block: vb.hash,
version: old_v.uuid,
deleted: true.into(),
})
.collect::<Vec<_>>();
block_ref_table.insert_many(&deleted_block_refs[..]).await?;
}
}
Ok(())
})
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
filter.apply(entry.deleted.get())
}
}
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