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Small refactor of tables internals

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This commit is contained in:
Alex Auvolat 2022-12-14 10:48:49 +01:00
parent d1279e04f3
commit f8e528c15d
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GPG key ID: 0E496D15096376BE
3 changed files with 24 additions and 29 deletions
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6
src/model/index_counter.rs
View file

@ -251,13 +251,9 @@ impl<T: CountedItem> IndexCounter<T> {
TR: TableReplication,
{
let save_counter_entry = |entry: CounterEntry<T>| -> Result<(), Error> {
let entry_k = self
.table
.data
.tree_key(entry.partition_key(), entry.sort_key());
self.table
.data
.update_entry_with(&entry_k, |ent| match ent {
.update_entry_with(&entry.partition_key(), &entry.sort_key(), |ent| match ent {
Some(mut ent) => {
ent.merge(&entry);
ent

7
src/model/k2v/rpc.rs
View file

@ -273,14 +273,9 @@ impl K2VRpcHandler {
}
fn local_insert(&self, item: &InsertedItem) -> Result<Option<K2VItem>, Error> {
let tree_key = self
.item_table
.data
.tree_key(&item.partition, &item.sort_key);
self.item_table
.data
.update_entry_with(&tree_key[..], |ent| {
.update_entry_with(&item.partition, &item.sort_key, |ent| {
let mut ent = ent.unwrap_or_else(|| {
K2VItem::new(
item.partition.bucket_id,

40
src/table/data.rs
View file

@ -173,9 +173,8 @@ where
pub(crate) fn update_entry(&self, update_bytes: &[u8]) -> Result<(), Error> {
let update = self.decode_entry(update_bytes)?;
let tree_key = self.tree_key(update.partition_key(), update.sort_key());
self.update_entry_with(&tree_key[..], |ent| match ent {
self.update_entry_with(update.partition_key(), update.sort_key(), |ent| match ent {
Some(mut ent) => {
ent.merge(&update);
ent
@ -187,11 +186,14 @@ where
pub fn update_entry_with(
&self,
tree_key: &[u8],
partition_key: &F::P,
sort_key: &F::S,
f: impl Fn(Option<F::E>) -> F::E,
) -> Result<Option<F::E>, Error> {
let tree_key = self.tree_key(partition_key, sort_key);
let changed = self.store.db().transaction(|mut tx| {
let (old_entry, old_bytes, new_entry) = match tx.get(&self.store, tree_key)? {
let (old_entry, old_bytes, new_entry) = match tx.get(&self.store, &tree_key)? {
Some(old_bytes) => {
let old_entry = self.decode_entry(&old_bytes).map_err(db::TxError::Abort)?;
let new_entry = f(Some(old_entry.clone()));
@ -200,23 +202,23 @@ where
None => (None, None, f(None)),
};
// Scenario 1: the value changed, so of course there is a change
let value_changed = Some(&new_entry) != old_entry.as_ref();
// Changed can be true in two scenarios
// Scenario 1: the actual represented value changed,
// so of course the messagepack encoding changed as well
// Scenario 2: the value didn't change but due to a migration in the
// data format, the messagepack encoding changed. In this case
// we have to write the migrated value in the table and update
// the associated Merkle tree entry.
// data format, the messagepack encoding changed. In this case,
// we also have to write the migrated value in the table and update
// the associated Merkle tree entry.
let new_bytes = rmp_to_vec_all_named(&new_entry)
.map_err(Error::RmpEncode)
.map_err(db::TxError::Abort)?;
let encoding_changed = Some(&new_bytes[..]) != old_bytes.as_ref().map(|x| &x[..]);
let changed = Some(&new_bytes[..]) != old_bytes.as_deref();
drop(old_bytes);
if value_changed || encoding_changed {
let new_bytes_hash = blake2sum(&new_bytes[..]);
tx.insert(&self.merkle_todo, tree_key, new_bytes_hash.as_slice())?;
tx.insert(&self.store, tree_key, new_bytes)?;
if changed {
let new_bytes_hash = blake2sum(&new_bytes);
tx.insert(&self.merkle_todo, &tree_key, new_bytes_hash.as_slice())?;
tx.insert(&self.store, &tree_key, new_bytes)?;
self.instance
.updated(&mut tx, old_entry.as_ref(), Some(&new_entry))?;
@ -242,7 +244,7 @@ where
let pk_hash = Hash::try_from(&tree_key[..32]).unwrap();
let nodes = self.replication.write_nodes(&pk_hash);
if nodes.first() == Some(&self.system.id) {
GcTodoEntry::new(tree_key.to_vec(), new_bytes_hash).save(&self.gc_todo)?;
GcTodoEntry::new(tree_key, new_bytes_hash).save(&self.gc_todo)?;
}
}
@ -258,10 +260,11 @@ where
.db()
.transaction(|mut tx| match tx.get(&self.store, k)? {
Some(cur_v) if cur_v == v => {
let old_entry = self.decode_entry(v).map_err(db::TxError::Abort)?;
tx.remove(&self.store, k)?;
tx.insert(&self.merkle_todo, k, vec![])?;
let old_entry = self.decode_entry(v).map_err(db::TxError::Abort)?;
self.instance.updated(&mut tx, Some(&old_entry), None)?;
Ok(true)
}
@ -285,10 +288,11 @@ where
.db()
.transaction(|mut tx| match tx.get(&self.store, k)? {
Some(cur_v) if blake2sum(&cur_v[..]) == vhash => {
let old_entry = self.decode_entry(&cur_v[..]).map_err(db::TxError::Abort)?;
tx.remove(&self.store, k)?;
tx.insert(&self.merkle_todo, k, vec![])?;
let old_entry = self.decode_entry(&cur_v[..]).map_err(db::TxError::Abort)?;
self.instance.updated(&mut tx, Some(&old_entry), None)?;
Ok(true)
}