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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::{BlobStorage, Store, Transaction};
use anyhow::Result;
use humansize::{DECIMAL, SizeFormatter};
use rocksdb::{Direction, ErrorKind, IteratorMode, OptimisticTransactionDB};
use std::{
path::Path,
sync::atomic::{AtomicU64, Ordering},
};
pub static NUM_TXN_COMMIT: AtomicU64 = AtomicU64::new(0);
pub static NUM_TXN_ATTEMPT: AtomicU64 = AtomicU64::new(0);
pub fn new(path: &Path) -> Result<OptimisticTransactionDB> {
Ok(OptimisticTransactionDB::open_default(path)?)
}
impl Store for OptimisticTransactionDB {
fn transaction(&self, f: &mut dyn FnMut(&mut dyn Transaction) -> Result<()>) -> Result<()> {
loop {
let mut txn = self.transaction();
NUM_TXN_ATTEMPT.fetch_add(1, Ordering::Relaxed);
f(&mut txn)?;
match txn.commit() {
Ok(()) => break,
Err(e) if e.kind() == ErrorKind::Busy => continue,
Err(e) => return Err(e.into()),
}
}
NUM_TXN_COMMIT.fetch_add(1, Ordering::Relaxed);
Ok(())
}
fn debug_info(&self) -> Result<String> {
let size = self.get_approximate_sizes(&[rocksdb::Range::new(&[0x00], &[0xff])])[0];
let attempts = NUM_TXN_ATTEMPT.load(Ordering::Relaxed);
let commits = NUM_TXN_COMMIT.load(Ordering::Relaxed);
let retry_factor = attempts as f64 / commits as f64;
Ok(format!(
"transactions attempted: {attempts:>12}\n\
transactions commited: {commits:>12}\n\
transaction retry factor: {retry_factor:>12.03}\n\
approximate size on disk: {:>12}\n",
SizeFormatter::new(size, DECIMAL).to_string()
))
}
}
impl Transaction 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)?)
}
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())
})))
}
}
impl BlobStorage for OptimisticTransactionDB {
fn store(&self, key: &str, value: &[u8]) -> Result<()> {
Ok(self.put(key, value)?)
}
fn read(&self, key: &str) -> Result<Option<Vec<u8>>> {
Ok(self.get(key)?)
}
fn debug_info(&self) -> Result<String> {
let size = self.get_approximate_sizes(&[rocksdb::Range::new(&[0x00], &[0xff])])[0];
Ok(format!(
"approximate size on disk: {:>12}\n",
SizeFormatter::new(size, DECIMAL).to_string()
))
}
}
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