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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) 2025 metamuffin <metamuffin.org>
*/
use crate::backends::{Db, ReadTransaction, ReadTxnFunction, WriteTransaction, WriteTxnFunction};
use anyhow::Result;
use std::{
collections::BTreeMap,
sync::{RwLock, RwLockReadGuard, RwLockWriteGuard},
};
type Inner = BTreeMap<Vec<u8>, Vec<u8>>;
pub struct Memory(RwLock<BTreeMap<Vec<u8>, Vec<u8>>>);
impl Memory {
pub fn new() -> Self {
Self(RwLock::new(BTreeMap::new()))
}
}
impl Db for Memory {
fn write_transaction(&self, f: &mut WriteTxnFunction) -> Result<()> {
f(&mut self.0.write().unwrap())
}
fn read_transaction(&self, f: &mut ReadTxnFunction) -> Result<()> {
f(&self.0.read().unwrap())
}
}
impl WriteTransaction for RwLockWriteGuard<'_, Inner> {
fn set(&mut self, key: &[u8], value: &[u8]) -> Result<()> {
(**self).insert(key.to_vec(), value.to_vec());
Ok(())
}
fn del(&mut self, key: &[u8]) -> Result<()> {
(**self).remove(key);
Ok(())
}
}
impl ReadTransaction for RwLockWriteGuard<'_, Inner> {
fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>> {
Ok((**self).get(key).cloned())
}
fn iter<'a>(
&'a self,
key: &[u8],
reverse: bool,
) -> Result<Box<dyn Iterator<Item = Result<Vec<u8>>> + 'a>> {
Ok(if reverse {
Box::new(self.range(key.to_vec()..).map(|e| Ok(e.0.to_vec())))
} else {
Box::new(self.range(..=key.to_vec()).rev().map(|e| Ok(e.0.to_vec())))
})
}
}
impl ReadTransaction for RwLockReadGuard<'_, Inner> {
fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>> {
Ok((**self).get(key).cloned())
}
fn iter<'a>(
&'a self,
key: &[u8],
reverse: bool,
) -> Result<Box<dyn Iterator<Item = Result<Vec<u8>>> + 'a>> {
Ok(if reverse {
Box::new(self.range(key.to_vec()..).map(|e| Ok(e.0.to_vec())))
} else {
Box::new(self.range(..=key.to_vec()).rev().map(|e| Ok(e.0.to_vec())))
})
}
}
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