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Don't fetch old values in cross-partition transactional inserts

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This commit is contained in:
Withings 2024-09-12 10:26:28 +02:00
parent 586957b4b7
commit 51ced60366
Signed by untrusted user: withings
GPG key ID: 7778B323E465AABB
3 changed files with 17 additions and 33 deletions
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8
src/db/lib.rs
View file

@ -274,12 +274,12 @@ impl<'a> Transaction<'a> {
tree: &Tree,
key: T,
value: U,
) -> TxOpResult<Option<Value>> {
) -> TxOpResult<()> {
self.tx.insert(tree.1, key.as_ref(), value.as_ref())
}
/// Returns the old value if there was one
#[inline]
pub fn remove<T: AsRef<[u8]>>(&mut self, tree: &Tree, key: T) -> TxOpResult<Option<Value>> {
pub fn remove<T: AsRef<[u8]>>(&mut self, tree: &Tree, key: T) -> TxOpResult<()> {
self.tx.remove(tree.1, key.as_ref())
}
/// Clears all values in a tree
@ -362,8 +362,8 @@ pub(crate) trait ITx {
fn get(&self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>>;
fn len(&self, tree: usize) -> TxOpResult<usize>;
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<Option<Value>>;
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>>;
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<()>;
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<()>;
fn clear(&mut self, tree: usize) -> TxOpResult<()>;
fn iter(&self, tree: usize) -> TxOpResult<TxValueIter<'_>>;

10
src/db/lmdb_adapter.rs
View file

@ -252,17 +252,15 @@ impl<'a> ITx for LmdbTx<'a> {
Ok(tree.len(&self.tx)? as usize)
}
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<Option<Value>> {
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<()> {
let tree = *self.get_tree(tree)?;
let old_val = tree.get(&self.tx, key)?.map(Vec::from);
tree.put(&mut self.tx, key, value)?;
Ok(old_val)
Ok(())
}
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<()> {
let tree = *self.get_tree(tree)?;
let old_val = tree.get(&self.tx, key)?.map(Vec::from);
tree.delete(&mut self.tx, key)?;
Ok(old_val)
Ok(())
}
fn clear(&mut self, tree: usize) -> TxOpResult<()> {
let tree = *self.get_tree(tree)?;

30
src/db/sqlite_adapter.rs
View file

@ -192,7 +192,7 @@ impl IDb for SqliteDb {
let db = self.db.get()?;
let lock = self.write_lock.lock();
let n = db.execute(&format!("DELETE FROM {} WHERE k = ?1", tree), params![key])?;
db.execute(&format!("DELETE FROM {} WHERE k = ?1", tree), params![key])?;
drop(lock);
Ok(())
@ -336,31 +336,17 @@ impl<'a> ITx for SqliteTx<'a> {
}
}
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<Option<Value>> {
fn insert(&mut self, tree: usize, key: &[u8], value: &[u8]) -> TxOpResult<()> {
let tree = self.get_tree(tree)?;
let old_val = self.internal_get(tree, key)?;
let sql = match &old_val {
Some(_) => format!("UPDATE {} SET v = ?2 WHERE k = ?1", tree),
None => format!("INSERT INTO {} (k, v) VALUES (?1, ?2)", tree),
};
let n = self.tx.execute(&sql, params![key, value])?;
assert_eq!(n, 1);
Ok(old_val)
let sql = format!("INSERT OR REPLACE INTO {} (k, v) VALUES (?1, ?2)", tree);
self.tx.execute(&sql, params![key, value])?;
Ok(())
}
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<Option<Value>> {
fn remove(&mut self, tree: usize, key: &[u8]) -> TxOpResult<()> {
let tree = self.get_tree(tree)?;
let old_val = self.internal_get(tree, key)?;
if old_val.is_some() {
let n = self
.tx
self.tx
.execute(&format!("DELETE FROM {} WHERE k = ?1", tree), params![key])?;
assert_eq!(n, 1);
}
Ok(old_val)
Ok(())
}
fn clear(&mut self, tree: usize) -> TxOpResult<()> {
let tree = self.get_tree(tree)?;