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|
use super::{protocol::Packet, Config, Game};
use crate::{database::DatabaseExt, State};
use anyhow::{anyhow, bail, Result};
use log::{debug, error, info};
use std::{ops::ControlFlow, sync::Arc, time::Duration};
use tokio::{
io::{AsyncBufReadExt, AsyncWrite, AsyncWriteExt, BufReader, BufWriter},
net::{TcpListener, TcpStream},
spawn,
time::sleep,
};
pub async fn game_server(config: Config, state: Arc<State>) -> Result<()> {
spawn(game_loop(config.clone(), state.clone()));
let listener = TcpListener::bind(config.bind).await?;
info!("listening on {}", listener.local_addr()?);
while let Ok((sock, addr)) = listener.accept().await {
let state = state.clone();
spawn(async move {
info!("connected {addr}");
if let Err(e) = handle_client(sock, state).await {
error!("client error: {e}")
}
info!("disconnected {addr}");
});
}
bail!("accept failure")
}
async fn game_loop(config: Config, state: Arc<State>) {
let mut speed = config.tickrate;
loop {
sleep(Duration::from_secs_f32(1. / speed)).await;
let mut g = state.game.write().await;
let res = g.tick();
match res {
ControlFlow::Continue(()) => {
let _ = state.tick.send(None);
speed += config.tickrate_speedup;
speed = speed.min(config.tickrate_max)
}
ControlFlow::Break(winner) => {
info!("winner: {winner:?}");
let p = state.players.read().await;
*g = Game::new(p.clone().into_iter().collect());
speed = config.tickrate;
let _ = state.tick.send(Some(winner));
}
}
drop(g);
}
}
struct ClientState {
pid: Option<u32>,
alive: bool,
}
async fn handle_client(sock: TcpStream, state: Arc<State>) -> Result<()> {
let mut cstate = ClientState {
pid: None,
alive: false,
};
let res = handle_client_inner(sock, &state, &mut cstate).await;
if let Some(pid) = cstate.pid {
state.players.write().await.remove(&pid);
}
res
}
async fn handle_client_inner(
sock: TcpStream,
state: &Arc<State>,
pid: &mut ClientState,
) -> anyhow::Result<()> {
let (rx, tx) = sock.into_split();
let rx = BufReader::new(rx);
let mut tx = BufWriter::new(tx);
let mut lines = rx.lines();
let mut ticks = state.tick.subscribe();
let mut chat = state.chat.subscribe();
tx.send_packet(Packet::Motd("This is the GPN-Tron Rust rewrite. It should be compatible with the original protocol: https://github.com/freehuntx/gpn-tron/blob/master/PROTOCOL.md".to_string())).await?;
loop {
tokio::select! {
message = chat.recv() => {
let (player, message) = message?;
tx.send_packet(Packet::Chat(format!("{player}: {message}"))).await?;
},
new_game = ticks.recv() => {
let new_game = new_game?;
handle_tick(&mut tx, pid, state, new_game).await?;
},
line = lines.next_line() => {
let line = line?.ok_or(anyhow!("eof"))?;
handle_packet(&mut tx, pid, state, line).await?;
},
};
}
}
trait SendPacketExt {
async fn send_packet(&mut self, packet: Packet) -> anyhow::Result<()>;
}
impl<T: AsyncWrite + Unpin> SendPacketExt for T {
async fn send_packet(&mut self, packet: Packet) -> anyhow::Result<()> {
debug!("-> {packet:?}");
self.write_all(packet.dump().as_bytes()).await?;
self.write_all(b"\n").await?;
self.flush().await?;
Ok(())
}
}
async fn handle_tick(
mut tx: impl AsyncWrite + Unpin,
cstate: &mut ClientState,
state: &Arc<State>,
new_game: Option<Option<u32>>,
) -> anyhow::Result<()> {
let Some(pid) = cstate.pid else { return Ok(()) };
let mut events = Vec::new();
if let Some(winner) = new_game {
if winner == cstate.pid {
tx.send_packet(Packet::Win(0, 0)).await?;
}
cstate.alive = true;
}
if !cstate.alive {
return Ok(());
}
{
let g = state.game.read().await;
if new_game.is_some() {
events.push(Packet::Game {
my_id: pid,
width: g.map.size.x as usize,
height: g.map.size.y as usize,
});
for (player, (_, _, name)) in &g.heads {
events.push(Packet::Player {
id: *player,
name: name.to_owned(),
})
}
}
for (player, (_, pos, _)) in &g.heads {
events.push(Packet::Pos {
id: *player,
x: pos.x,
y: pos.y,
})
}
if g.dead.contains(&pid) {
cstate.alive = false;
events.push(Packet::Lose(0, 0)); // TODO implement stats
} else {
if !g.dead.is_empty() {
events.push(Packet::Die(g.dead.clone()));
}
events.push(Packet::Tick);
}
}
for e in events {
tx.send_packet(e).await?;
}
Ok(())
}
async fn handle_packet(
mut tx: impl AsyncWrite + Unpin,
cstate: &mut ClientState,
state: &Arc<State>,
line: String,
) -> anyhow::Result<()> {
let packet = match Packet::parse(&line) {
Ok(p) => p,
Err(e) => {
tx.send_packet(Packet::Error(format!("invalid packet: {e:?}")))
.await?;
return Err(e);
}
};
debug!("<- {packet:?}");
match packet {
Packet::Join { username, password } => {
if username.len() > 64 || password.len() > 64 {
tx.send_packet(Packet::Error(
"password or username too long (> 64)".to_string(),
))
.await?;
return Ok(());
}
if !state.db.check_or_insert_creds(&username, &password)? {
tx.send_packet(Packet::Error("incorrect password".to_string()))
.await?;
return Ok(());
}
if cstate.pid.is_some() {
tx.send_packet(Packet::Error("already joined".to_string()))
.await?
} else {
let mut g = state.players.write().await;
let mut id = 0;
while g.contains_key(&id) {
id += 1;
}
g.insert(id, username);
cstate.pid = Some(id);
}
}
Packet::Move(dir) => {
if let Some(pid) = cstate.pid {
let mut g = state.game.write().await;
if let Some((head_dir, _, _)) = g.heads.get_mut(&pid) {
*head_dir = dir
} else {
drop(g);
tx.send_packet(Packet::Error("you are already dead".to_string()))
.await?
}
} else {
tx.send_packet(Packet::Error("you need to join first".to_string()))
.await?
}
}
Packet::Chat(message) => {
if message.len() > 128 {
tx.send_packet(Packet::Error("chat message too long (> 128)".to_string()))
.await?;
return Ok(());
}
let _ = state.chat.send(("".to_string(), message));
}
_ => {
tx.send_packet(Packet::Error("clients dont send this packet".to_string()))
.await?
}
};
Ok(())
}
|
