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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 log::info;
use redb::{Database, TableDefinition};
use std::{
collections::HashMap,
env::var,
fs::{File, create_dir_all, rename},
io::{Read, Write},
marker::PhantomData,
path::{Path, PathBuf},
sync::Mutex,
};
const T_ENTRIES: TableDefinition<[u8; 32], &[u8]> = TableDefinition::new("e");
pub enum ResourceStore {
Redb(Database),
Filesystem(PathBuf),
Memory(Mutex<HashMap<Resource, Vec<u8>>>),
}
impl ResourceStore {
pub fn new_env() -> Result<Self> {
if var("WEARECHAT_RES_CACHE_USE_MEMORY").is_ok() {
Ok(Self::new_memory())
} else if var("WEARECHAT_RES_CACHE_USE_REDB").is_ok() {
Self::new_redb(
&xdg::BaseDirectories::with_prefix("wearechat")?
.place_cache_file("resources.db")?,
)
} else {
Self::new_filesystem(
&xdg::BaseDirectories::with_prefix("wearechat")?
.create_cache_directory("resources")?,
)
}
}
pub fn new_filesystem(path: &Path) -> Result<Self> {
info!("using filesystem resource cache in {path:?}");
create_dir_all(path)?;
Ok(Self::Filesystem(path.to_owned()))
}
pub fn new_redb(path: &Path) -> Result<Self> {
info!("initializing redb resource cache...");
let db = Database::create(path)?;
let txn = db.begin_write()?;
txn.open_table(T_ENTRIES)?;
txn.commit()?;
info!("done");
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())),
ResourceStore::Filesystem(root) => {
let path = fs_cache_path(root, key);
if path.exists() {
let mut buf = Vec::new();
File::open(path)?.read_to_end(&mut buf)?;
Ok(Some(buf))
} else {
Ok(None)
}
}
}
}
pub fn set_raw(&self, value: &[u8]) -> Result<Resource> {
let key = Resource(resource_hash(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());
}
ResourceStore::Filesystem(root) => {
let path = fs_cache_path(root, key);
if !path.exists() {
let path_temp = path.with_extension("part");
File::create(&path_temp)?.write_all(value)?;
rename(path_temp, path)?;
}
}
}
Ok(key)
}
pub fn iter(&self, mut cb: impl FnMut(Resource, usize)) -> Result<()> {
match self {
ResourceStore::Redb(_database) => todo!(),
ResourceStore::Filesystem(_root) => {
for e in _root.read_dir()? {
let e = e?;
let k = e.file_name();
let k = k.to_string_lossy();
let m = e.metadata()?.len();
let mut r = [0; 32];
for i in 0..32 {
r[i] = u8::from_str_radix(&k[i * 2..(i + 1) * 2], 16)?
}
cb(Resource(r, PhantomData), m as usize)
}
Ok(())
}
ResourceStore::Memory(mutex) => {
mutex
.lock()
.unwrap()
.iter()
.for_each(|(k, v)| cb(*k, v.len()));
Ok(())
}
}
}
}
pub fn resource_hash(x: &[u8]) -> [u8; 32] {
let mut hasher = blake3::Hasher::new();
hasher.update(x);
hasher.finalize().into()
}
fn fs_cache_path(path: &Path, res: Resource) -> PathBuf {
path.join(format!(
"{:016x}{:016x}{:016x}{:016x}",
u64::from_le_bytes(res.0[0..8].try_into().unwrap()),
u64::from_le_bytes(res.0[8..16].try_into().unwrap()),
u64::from_le_bytes(res.0[16..24].try_into().unwrap()),
u64::from_le_bytes(res.0[24..32].try_into().unwrap()),
))
}
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