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/*
Hurry Curry! - a game about cooking
Copyright (C) 2025 Hurry Curry! Contributors
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 anyhow::{Context, Result, bail};
use hurrycurry_game_core::network::tokio::Network;
use hurrycurry_protocol::PacketC;
use log::info;
use std::{
collections::BTreeMap,
net::SocketAddr,
time::{Duration, Instant},
};
use tokio::{
net::TcpStream,
sync::{RwLock, Semaphore},
time::{sleep, timeout},
};
#[derive(Debug, Clone, Copy)]
struct ConnectTest {
verified_at: Instant,
version: (u32, u32),
}
static CONNECT_OK: RwLock<BTreeMap<SocketAddr, ConnectTest>> = RwLock::const_new(BTreeMap::new());
static CONNECT_SEMAPHORE: Semaphore = Semaphore::const_new(10);
pub(crate) async fn prune_connect_cache_task() {
loop {
sleep(Duration::from_secs(600)).await;
CONNECT_OK
.write()
.await
.retain(|_, v| v.verified_at.elapsed().as_secs() < 3600);
}
}
pub(crate) async fn test_connect(addr: SocketAddr, uri: &str) -> Result<(u32, u32), &'static str> {
let r = CONNECT_OK.read().await.get(&addr).copied();
if let Some(r) = r {
Ok(r.version)
} else {
// TODO locks to prevent parallel tests for same addr and dos attempts
let _permit = CONNECT_SEMAPHORE.acquire().await;
let res = timeout(Duration::from_secs(10), test_connect_inner(addr, uri))
.await
.map_err(|_| "connect timeout")?;
info!("connect result: {res:?}");
drop(_permit);
let version = res.map_err(|_| "server unreachable")?;
let mut g = CONNECT_OK.write().await;
g.insert(
addr,
ConnectTest {
verified_at: Instant::now(),
version,
},
);
Ok(version)
}
}
async fn test_connect_inner(addr: SocketAddr, uri: &str) -> Result<(u32, u32)> {
info!("test connect {addr} {uri:?}");
let stream = TcpStream::connect(addr).await.context("connect")?;
let net = Network::connect_raw(stream, uri).await.context("upgrade")?;
let packet = net.receive().await.context("receive")?;
match packet {
Some(PacketC::Version { minor, major, .. }) => Ok((major, minor)),
_ => bail!("bad initial packet"),
}
}
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