124 lines
3.7 KiB
Rust
124 lines
3.7 KiB
Rust
use std::{net::SocketAddr, ops::ControlFlow, sync::Arc};
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use axum::{
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body::Bytes,
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extract::{
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ws::{Message, Utf8Bytes, WebSocket, WebSocketUpgrade},
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ConnectInfo,
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State
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},
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response::IntoResponse
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};
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use serde_json::json;
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use crate::{utils::events, AppState};
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use futures_util::{sink::SinkExt, stream::StreamExt};
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#[axum::debug_handler]
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pub async fn ws_handler(
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ws: WebSocketUpgrade,
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ConnectInfo(addr): ConnectInfo<SocketAddr>,
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State(state): State<Arc<AppState>>
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) -> impl IntoResponse {
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println!("`{addr} connected.");
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// finalize the upgrade process by returning upgrade callback.
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// we can customize the callback by sending additional info such as address.
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ws.on_upgrade(move |socket| handle_socket(socket, addr, state))
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}
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async fn handle_socket(mut socket: WebSocket, who: SocketAddr, state: Arc<AppState>) {
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if socket
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.send(Message::Ping(Bytes::from_static(&[4, 2])))
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.await
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.is_ok()
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{
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println!("WS >>> Pinged {who}...");
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} else {
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println!("WS >>> Could not send ping {who}!");
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return;
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}
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if let Some(msg) = socket.recv().await {
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if let Ok(msg) = msg {
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if process_message(msg, who).is_break() {
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return;
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}
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} else {
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println!("WS >>> Client {who} abruptly disconnected");
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return;
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}
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}
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let (mut sender, mut receiver) = socket.split();
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let mut recv_task = tokio::spawn(async move {
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while let Some(Ok(msg)) = receiver.next().await {
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if process_message(msg, who).is_break() {
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break;
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}
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}
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});
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let mut send_task = tokio::spawn(async move {
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let mut event_listener = state.event_bus.subscribe();
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loop {
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match event_listener.recv().await {
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Err(_) => (),
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Ok(event) => {
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match event {
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events::Event::WebsocketBroadcast(message) => {
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let _ = sender.send(Message::Text(Utf8Bytes::from(message.to_json().to_string()))).await;
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}
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}
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}
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}
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}
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});
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tokio::select! {
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rv_a = (&mut send_task) => {
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match rv_a {
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Ok(()) => println!("WS >>> Sender connection with {who} gracefully shut down"),
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Err(a) => println!("WS >>> Error sending messages {a:?}")
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}
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recv_task.abort();
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},
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rv_b = (&mut recv_task) => {
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match rv_b {
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Ok(()) => println!("WS >>> Receiver connection with {who} gracefully shut down"),
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Err(b) => println!("WS >>> Error receiving messages {b:?}")
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}
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send_task.abort();
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}
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}
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}
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fn process_message(msg: Message, who: SocketAddr) -> ControlFlow<(), ()> {
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match msg {
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Message::Text(t) => {
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println!("WS >>> {who} sent str: {t:?}");
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}
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Message::Binary(d) => {
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println!("WS >>> {who} sent {} bytes: {d:?}", d.len());
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}
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Message::Close(c) => {
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if let Some(cf) = c {
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println!(
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"WS >>> {who} sent close with code {} and reason `{}`",
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cf.code, cf.reason
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);
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} else {
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println!("WS >>> {who} somehow sent close message without CloseFrame");
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}
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return ControlFlow::Break(());
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}
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Message::Pong(v) => {
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println!("WS >>> {who} sent pong with {v:?}");
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}
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Message::Ping(v) => {
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println!("WS >>> {who} sent ping with {v:?}");
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}
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}
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ControlFlow::Continue(())
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}
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