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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::network::Network;
use anyhow::Result;
use log::debug;
use std::{collections::HashSet, marker::PhantomData, sync::RwLock};
use weareshared::{
helper::ReadWrite,
packets::{Packet, Resource},
store::{ResourceStore, sha256},
};
pub struct Downloader {
inner: RwLock<DownloaderState>,
}
struct DownloaderState {
have: HashSet<Resource>,
need: HashSet<Resource>,
pending: HashSet<Resource>,
store: ResourceStore,
}
impl Downloader {
pub fn new(store: ResourceStore) -> Self {
Self {
inner: DownloaderState {
have: HashSet::new(),
need: HashSet::new(),
pending: HashSet::new(),
store,
}
.into(),
}
}
pub fn try_get<T: ReadWrite>(&self, hash: Resource<T>) -> Result<Option<T>> {
self.try_get_raw(Resource(hash.0, PhantomData))?
.map(|x| T::read(&mut x.as_slice()))
.transpose()
}
pub fn try_get_raw(&self, hash: Resource) -> Result<Option<Vec<u8>>> {
let mut state = self.inner.write().unwrap();
if state.have.contains(&hash) {
state.store.get_raw(hash)
} else if state.need.contains(&hash) {
Ok(None)
} else if let Some(res) = state.store.get_raw(hash)? {
state.have.insert(hash);
Ok(Some(res))
} else {
state.need.insert(hash);
Ok(None)
}
}
pub fn packet(&self, p: &Packet) -> Result<()> {
let mut state = self.inner.write().unwrap();
match p {
Packet::RespondResource(d) => {
let key = Resource(sha256(&d.0), PhantomData);
state.store.set_raw(&d.0)?;
state.need.remove(&key);
state.pending.remove(&key);
if state.have.insert(key) {
debug!("have {key}");
}
}
_ => (),
}
Ok(())
}
pub fn update(&self, network: &Network) -> Result<()> {
let mut state = self.inner.write().unwrap();
let mut new_pending = Vec::new();
for n in state
.need
.difference(&state.pending)
.take(32 - state.pending.len())
{
network
.packet_send
.send(Packet::RequestResource(*n))
.unwrap();
debug!("need {n}");
new_pending.push(*n);
}
state.pending.extend(new_pending);
Ok(())
}
}
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