2023-11-03 23:49:18 +01:00
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use std::{
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sync::Arc,
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time::{Duration, Instant},
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};
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use actix_web::{middleware::Logger, web, App, HttpRequest, HttpResponse, HttpServer};
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use actix_ws::{Message, Session};
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2024-03-02 22:29:40 +01:00
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use futures_util::{stream::FuturesUnordered, StreamExt as _};
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2023-11-03 23:49:18 +01:00
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use log::info;
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use tokio::sync::Mutex;
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#[derive(Clone)]
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struct Chat {
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inner: Arc<Mutex<ChatInner>>,
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}
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struct ChatInner {
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sessions: Vec<Session>,
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}
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impl Chat {
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fn new() -> Self {
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Chat {
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inner: Arc::new(Mutex::new(ChatInner {
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sessions: Vec::new(),
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})),
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}
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}
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async fn insert(&self, session: Session) {
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self.inner.lock().await.sessions.push(session);
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}
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async fn send(&self, msg: String) {
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let mut inner = self.inner.lock().await;
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let mut unordered = FuturesUnordered::new();
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for mut session in inner.sessions.drain(..) {
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let msg = msg.clone();
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unordered.push(async move {
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let res = session.text(msg).await;
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res.map(|_| session).map_err(|_| info!("Dropping session"))
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});
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}
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while let Some(res) = unordered.next().await {
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if let Ok(session) = res {
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inner.sessions.push(session);
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}
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}
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}
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}
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async fn ws(
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req: HttpRequest,
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body: web::Payload,
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chat: web::Data<Chat>,
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) -> Result<HttpResponse, actix_web::Error> {
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let (response, mut session, mut stream) = actix_ws::handle(&req, body)?;
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chat.insert(session.clone()).await;
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info!("Inserted session");
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let alive = Arc::new(Mutex::new(Instant::now()));
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let mut session2 = session.clone();
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let alive2 = alive.clone();
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actix_rt::spawn(async move {
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let mut interval = actix_rt::time::interval(Duration::from_secs(5));
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loop {
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interval.tick().await;
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if session2.ping(b"").await.is_err() {
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break;
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}
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if Instant::now().duration_since(*alive2.lock().await) > Duration::from_secs(10) {
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let _ = session2.close(None).await;
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break;
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}
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}
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});
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actix_rt::spawn(async move {
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while let Some(Ok(msg)) = stream.next().await {
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match msg {
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Message::Ping(bytes) => {
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if session.pong(&bytes).await.is_err() {
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return;
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}
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}
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Message::Text(s) => {
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info!("Relaying text, {}", s);
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let s: &str = s.as_ref();
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chat.send(s.into()).await;
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}
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Message::Close(reason) => {
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let _ = session.close(reason).await;
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info!("Got close, bailing");
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return;
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}
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Message::Continuation(_) => {
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let _ = session.close(None).await;
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info!("Got continuation, bailing");
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return;
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}
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Message::Pong(_) => {
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*alive.lock().await = Instant::now();
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}
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_ => (),
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};
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}
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let _ = session.close(None).await;
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});
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info!("Spawned");
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Ok(response)
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}
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async fn index() -> HttpResponse {
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let s = r#"
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<html>
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<head>
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<meta charset="utf-8" />
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<title>Chat</title>
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<script>
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function onLoad() {
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console.log("BOOTING");
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const socket = new WebSocket("ws://localhost:8080/ws");
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const input = document.getElementById("chat-input");
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const logs = document.getElementById("chat-logs");
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if (!input || !logs) {
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alert("Couldn't find required elements");
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console.err("Couldn't find required elements");
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return;
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}
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input.addEventListener("keyup", event => {
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if (event.isComposing) {
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return;
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}
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if (event.key != "Enter") {
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return;
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}
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socket.send(input.value);
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input.value = "";
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}, false);
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socket.onmessage = event => {
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const newNode = document.createElement("li");
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newNode.textContent = event.data;
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let firstChild = null;
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for (const n of logs.childNodes.values()) {
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if (n.nodeType == 1) {
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firstChild = n;
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break;
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}
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}
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if (firstChild) {
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logs.insertBefore(newNode, firstChild);
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} else {
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logs.appendChild(newNode);
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}
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};
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window.addEventListener("beforeunload", () => { socket.close() });
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}
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if (document.readyState === "complete") {
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onLoad();
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} else {
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document.addEventListener("DOMContentLoaded", onLoad, false);
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}
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</script>
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</head>
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<body>
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<input id="chat-input" type="test" />
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<ul id="chat-logs">
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</ul>
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</body>
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</html>
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"#;
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HttpResponse::Ok().content_type("text/html").body(s)
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}
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#[actix_rt::main]
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async fn main() -> Result<(), anyhow::Error> {
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std::env::set_var("RUST_LOG", "info");
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pretty_env_logger::init();
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let chat = Chat::new();
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HttpServer::new(move || {
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App::new()
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.wrap(Logger::default())
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.app_data(web::Data::new(chat.clone()))
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.route("/", web::get().to(index))
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.route("/ws", web::get().to(ws))
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})
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.bind("127.0.0.1:8080")?
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.run()
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.await?;
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Ok(())
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}
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