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use anyhow::Result;
use clap::Parser;
use log::{debug, info};
use std::{
collections::HashMap,
io::{BufReader, BufWriter},
net::{IpAddr, TcpListener, TcpStream},
sync::{
Arc, Mutex,
mpsc::{Receiver, Sender, channel},
},
thread::spawn,
};
use weareshared::{packets::Packet, store::ResourceStore, tree::SceneTree};
#[derive(Parser, Debug)]
struct Args {
#[arg(short, long, default_value = "::0")]
bind_addr: IpAddr,
#[arg(short, long, default_value = "28555")]
port: u16,
}
struct State {
tx: HashMap<usize, Sender<Packet>>,
store: ResourceStore,
tree: SceneTree,
}
fn main() -> Result<()> {
env_logger::init_from_env("LOG");
let args = Args::parse();
let listener = TcpListener::bind((args.bind_addr, args.port))?;
info!("bound to {}", listener.local_addr()?);
let state = Arc::new(Mutex::new(State::new()?));
for conn in 0.. {
let (sock, addr) = listener.accept()?;
info!("{addr} connected");
let (tx, rx) = channel();
state.lock().unwrap().tx.insert(conn, tx);
let state2 = state.clone();
let sock2 = sock.try_clone().unwrap();
spawn(move || {
let _ = handle_conn_read(conn, sock, state2.clone());
info!("{addr} disconnected");
state2.lock().unwrap().tx.remove(&conn);
});
spawn(move || {
let _ = handle_conn_write(conn, sock2, rx);
});
}
Ok(())
}
fn handle_conn_read(conn: usize, sock: TcpStream, state: Arc<Mutex<State>>) -> Result<()> {
let mut sock = BufReader::new(sock);
loop {
let packet = Packet::deserialize(&mut sock)?;
debug!("{conn} <- {packet:?}");
state.lock().unwrap().handle_packet(conn, packet)?;
}
}
fn handle_conn_write(conn: usize, sock: TcpStream, rx: Receiver<Packet>) -> Result<()> {
let mut sock = BufWriter::new(sock);
for packet in rx {
debug!("{conn} -> {packet:?}");
packet.serialize(&mut sock)?;
}
Ok(())
}
impl State {
pub fn new() -> Result<Self> {
Ok(Self {
tx: HashMap::new(),
store: ResourceStore::new_persistent(
&xdg::BaseDirectories::with_prefix("weareserver")?.place_cache_file("resources")?,
)?,
tree: SceneTree::default(),
})
}
pub fn broadcast(&self, packet: Packet) -> Result<()> {
for tx in self.tx.values() {
tx.send(packet.clone())?;
}
Ok(())
}
pub fn send(&self, conn: usize, packet: Packet) -> Result<()> {
if let Some(tx) = self.tx.get(&conn) {
tx.send(packet)?;
}
Ok(())
}
pub fn handle_packet(&mut self, conn: usize, packet: Packet) -> Result<()> {
self.tree.update(&packet);
match packet {
Packet::RequestResource(resource) => {
if let Some(r) = self.store.get(resource)? {
self.send(conn, Packet::RespondResource(r))?;
} else {
self.broadcast(Packet::RequestResource(resource))?;
}
}
Packet::RespondResource(data) => {
self.store.set(&data)?;
self.broadcast(Packet::RespondResource(data))?;
}
Packet::Add(object, resource) => {
self.broadcast(Packet::Add(object, resource))?;
}
Packet::Remove(object) => {
self.broadcast(Packet::Remove(object))?;
}
Packet::Position(object, pos, rot) => {
self.broadcast(Packet::Position(object, pos, rot))?;
}
Packet::Pose(object, vec) => {
self.broadcast(Packet::Pose(object, vec))?;
}
Packet::Parent(parent, child) => {
self.broadcast(Packet::Parent(parent, child))?;
}
Packet::Sound(object, vec) => {
self.broadcast(Packet::Sound(object, vec))?;
}
}
Ok(())
}
}
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