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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2026 metamuffin <metamuffin.org>
*/
use crate::backends::{Database, ReadTransaction, WriteTransaction, WriteTxnFunction};
use anyhow::Result;
use rocksdb::{Direction, ErrorKind, IteratorMode, OptimisticTransactionDB};
use std::path::Path;
pub fn new(path: &Path) -> Result<OptimisticTransactionDB> {
Ok(OptimisticTransactionDB::open_default(path)?)
}
impl Database for OptimisticTransactionDB {
fn write_transaction(&self, f: &mut WriteTxnFunction) -> Result<()> {
loop {
let mut txn = self.transaction();
f(&mut txn)?;
match txn.commit() {
Ok(()) => break Ok(()),
Err(e) if e.kind() == ErrorKind::Busy => continue,
Err(e) => return Err(e.into()),
}
}
}
fn read_transaction(&self, f: &mut super::ReadTxnFunction) -> Result<()> {
loop {
let txn = self.transaction();
f(&txn)?;
match txn.commit() {
Ok(()) => break Ok(()),
Err(e) if e.kind() == ErrorKind::Busy => continue,
Err(e) => return Err(e.into()),
}
}
}
}
impl WriteTransaction for rocksdb::Transaction<'_, OptimisticTransactionDB> {
fn set(&mut self, key: &[u8], value: &[u8]) -> Result<()> {
Ok(self.put(key, value)?)
}
fn del(&mut self, key: &[u8]) -> Result<()> {
Ok(self.delete(key)?)
}
}
impl ReadTransaction for rocksdb::Transaction<'_, OptimisticTransactionDB> {
fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>> {
Ok(self.get(key)?)
}
fn iter<'a>(
&'a self,
key: &[u8],
reverse: bool,
) -> Result<Box<dyn Iterator<Item = Result<Vec<u8>>> + 'a>> {
let mut iter = self.iterator(IteratorMode::Start);
iter.set_mode(IteratorMode::From(
key,
if reverse {
Direction::Reverse
} else {
Direction::Forward
},
));
Ok(Box::new(iter.map(|e| {
e.map(|(k, _)| k.into_vec()).map_err(|e| e.into())
})))
}
}
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