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/*
wearechat - generic multiplayer game with voip
Copyright (C) 2025 metamuffin
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, version 3 of the License only.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
use crate::{helper::ReadWrite, packets::Resource};
use anyhow::Result;
use redb::{Database, TableDefinition};
use sha2::{Digest, Sha256};
use std::{collections::HashMap, marker::PhantomData, path::Path, sync::Mutex};
const T_ENTRIES: TableDefinition<[u8; 32], &[u8]> = TableDefinition::new("e");
pub enum ResourceStore {
Redb(Database),
Memory(Mutex<HashMap<Resource, Vec<u8>>>),
}
impl ResourceStore {
pub fn new_persistent(path: &Path) -> Result<Self> {
let db = Database::create(path)?;
let txn = db.begin_write()?;
txn.open_table(T_ENTRIES)?;
txn.commit()?;
Ok(Self::Redb(db))
}
pub fn new_memory() -> Self {
Self::Memory(HashMap::new().into())
}
pub fn get<T: ReadWrite>(&self, key: Resource<T>) -> Result<Option<T>> {
self.get_raw(Resource(key.0, PhantomData))?
.map(|b| T::read(&mut b.as_slice()))
.transpose()
}
pub fn set<T: ReadWrite>(&self, value: &T) -> Result<Resource<T>> {
Ok(Resource(self.set_raw(&value.write_alloc())?.0, PhantomData))
}
pub fn get_raw(&self, key: Resource) -> Result<Option<Vec<u8>>> {
match self {
ResourceStore::Redb(database) => {
let txn = database.begin_read()?;
let ent = txn.open_table(T_ENTRIES)?;
match ent.get(key.0)? {
Some(x) => Ok(Some(x.value().to_vec())),
None => Ok(None),
}
}
ResourceStore::Memory(map) => Ok(map.lock().unwrap().get(&key).map(|x| x.to_vec())),
}
}
pub fn set_raw(&self, value: &[u8]) -> Result<Resource> {
let key = Resource(sha256(value), PhantomData);
match self {
ResourceStore::Redb(database) => {
let txn = database.begin_write()?;
let mut ent = txn.open_table(T_ENTRIES)?;
ent.insert(key.0, value)?;
drop(ent);
txn.commit()?;
}
ResourceStore::Memory(map) => {
map.lock().unwrap().insert(key, value.to_vec());
}
}
Ok(key)
}
pub fn iter(&self, mut cb: impl FnMut(&[u8])) -> Result<()> {
match self {
ResourceStore::Redb(_database) => todo!(),
ResourceStore::Memory(mutex) => {
mutex.lock().unwrap().values().for_each(|v| cb(v));
Ok(())
}
}
}
}
pub fn sha256(x: &[u8]) -> [u8; 32] {
let mut hasher = Sha256::new();
hasher.update(x);
hasher.finalize().into()
}
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