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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, ReadTxnFunction, WriteTransaction, WriteTxnFunction,
};
use anyhow::Result;
use redb::{AccessGuard, ReadableDatabase, ReadableTable, StorageError, Table, TableDefinition};
use std::path::Path;
const TABLE: TableDefinition<&[u8], &[u8]> = TableDefinition::new("kv");
pub fn new(path: &Path) -> Result<redb::Database> {
Ok(redb::Database::create(path)?)
}
impl Database for redb::Database {
fn write_transaction(&self, f: &mut WriteTxnFunction) -> Result<()> {
let txn = self.begin_write()?;
let mut table = txn.open_table(TABLE)?;
f(&mut table)?;
drop(table);
txn.commit()?;
Ok(())
}
fn read_transaction(&self, f: &mut ReadTxnFunction) -> Result<()> {
let mut txn = self.begin_read()?;
f(&mut txn)?;
Ok(())
}
}
impl WriteTransaction for Table<'_, &[u8], &[u8]> {
fn set(&mut self, key: &[u8], value: &[u8]) -> Result<()> {
self.insert(key, value)?;
Ok(())
}
fn del(&mut self, key: &[u8]) -> Result<()> {
self.remove(key)?;
Ok(())
}
}
impl ReadTransaction for Table<'_, &[u8], &[u8]> {
fn get<'a>(&'a self, key: &[u8]) -> Result<Option<Vec<u8>>> {
match <Self as ReadableTable<_, _>>::get(self, key)? {
Some(v) => Ok(Some(v.value().to_vec())),
None => Ok(None),
}
}
fn iter<'a>(
&'a self,
key: &[u8],
reverse: bool,
) -> Result<Box<dyn Iterator<Item = Result<Vec<u8>>> + 'a>> {
let k = |e: Result<(AccessGuard<'_, &[u8]>, AccessGuard<'_, &[u8]>), StorageError>| {
e.map(|e| e.0.value().to_vec()).map_err(|e| e.into())
};
Ok(if reverse {
Box::new(self.range(..=key)?.rev().map(k))
} else {
Box::new(self.range(key..)?.map(k))
})
}
}
impl ReadTransaction for redb::ReadTransaction {
fn get<'a>(&'a self, key: &[u8]) -> Result<Option<Vec<u8>>> {
match self.open_table(TABLE)?.get(key)? {
Some(v) => Ok(Some(v.value().to_vec())),
None => Ok(None),
}
}
fn iter<'a>(
&'a self,
key: &[u8],
reverse: bool,
) -> Result<Box<dyn Iterator<Item = Result<Vec<u8>>> + 'a>> {
let k = |e: Result<(AccessGuard<'_, &[u8]>, AccessGuard<'_, &[u8]>), StorageError>| {
e.map(|e| e.0.value().to_vec()).map_err(|e| e.into())
};
Ok(if reverse {
Box::new(self.open_table(TABLE)?.range(..=key)?.rev().map(k))
} else {
Box::new(self.open_table(TABLE)?.range(key..)?.map(k))
})
}
}
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