refactoring

pub/index.html

@@ -21,6 +21,10 @@
 	<span class="footer">LJ Sketch</span>
       </div>
 
+    </div>
+    
+    <div id="errorBox" class="invisible"></div>
+      
     <script src="main.js"></script>
 
   </body>

pub/main.js

@@ -108,13 +108,22 @@ const initDrawing = (canvas, clearButton, selectedColor, ws) => {
     });
 };
 
-
-const initWs = () => {
+const initWs = errorBox => {
     const socket = new WebSocket('ws://localhost:3000/ws');
 
     socket.addEventListener('open', function (event) {
+	console.log("Open", event);
+    });
+    socket.addEventListener('error', function (event) {
+	console.log("Error:", event);
+	errorBox.className = "visible";
+	errorBox.innerHTML = "Error: " + event.message;
+    });
+    socket.addEventListener("close", (event) => {
+	console.log("Close:", event);
+	errorBox.className = "visible";
+	errorBox.innerHTML = "Disconnected: server closed connexion";
     });
-    
     return socket;
 };
 
@@ -122,9 +131,9 @@ window.onload = () => {
     const colorsDiv = document.querySelector("#colors");
     const selectedColor = document.querySelector("#selectedColor");
     const clearButton = document.querySelector("#clearButton");
+    const errorBox = document.querySelector("#errorBox");
     const canvas = document.querySelector("#canvas");
     initUI(colorsDiv, selectedColor);
-    let ws = initWs();
+    let ws = initWs(errorBox);
     initDrawing(canvas, clearButton, selectedColor, ws);
-    
 };

pub/style.css

@@ -64,3 +64,20 @@ body {
     text-align: center;
 }
 
+#errorBox {
+    border: thick solid #990000;
+    background: #dd0000;
+    position: fixed;
+    bottom: 0px;
+    right: 0px;
+    text-align: center;
+    padding: 1em;
+    font-size: x-large;
+}
+
+.visible {
+    display: block;
+}
+.invisible {
+    display: none;
+}

src/gen_server.rs

@@ -25,8 +25,7 @@ async fn gen_server(mut rx: Receiver<GSMsg>) {
 	match msg {
 	    GSMsg::NewClient((addr, c_tx)) => {
 		for line in &lines {
-		    c_tx.send(GSMsg::NewLine(line.clone()))
-			.await.unwrap();
+		    c_tx.send(GSMsg::NewLine(line.clone())).await.unwrap();
 		}
 		clients.insert(addr, c_tx);		
 		tracing::info!("NewClient {addr}");

src/main.rs

@@ -27,11 +27,8 @@ const LISTEN_ON : &str = "0.0.0.0:3000";
 #[tokio::main]
 async fn main() {
     tracing_subscriber::registry()
-        .with(
-            tracing_subscriber::EnvFilter::try_from_default_env()
-                .unwrap_or_else(|_| "lj_sketch=info,tower_http=info"
-				.into()),
-        )
+        .with(tracing_subscriber::EnvFilter::try_from_default_env()
+              .unwrap_or_else(|_| "lj_sketch=info,tower_http=info".into()))
         .with(tracing_subscriber::fmt::layer())
         .init();
 

src/ws_client.rs

@@ -1,10 +1,10 @@
-use axum::extract::ws::{ Message, Message::Text, Message::Close, WebSocket };
+use axum::extract::ws::{Message, Message::Text, Message::Close, WebSocket};
 use std::net::SocketAddr;
 use tokio::sync::mpsc::{self, Sender};
-use serde::{Serialize,Deserialize};
-use  core::ops::ControlFlow;
+use serde::{Serialize, Deserialize};
+use core::ops::ControlFlow;
 use crate::gen_server::GSMsg;
-use crate::line::{Line,simplify_line};
+use crate::line::{Line, simplify_line};
 		  
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(tag = "t")]
@@ -26,8 +26,8 @@ pub async fn handle_socket(
     who: SocketAddr,
     gs_tx: Sender<GSMsg>
 ) {
-    let (c_tx, mut c_rx) = mpsc::channel(32); 
-    gs_tx.send(GSMsg::NewClient((who, c_tx))).await.unwrap();
+    let (chan_tx, mut chan_rx) = mpsc::channel(32); 
+    gs_tx.send(GSMsg::NewClient((who, chan_tx))).await.unwrap();
     let mut line : Line = vec![];
 
     loop {
@@ -42,7 +42,7 @@ pub async fn handle_socket(
 		    ControlFlow::Continue(()) => {}
 		}
 	    },
-	    Some(msg) = c_rx.recv() => {
+	    Some(msg) = chan_rx.recv() => {
 		process_gs_msg(&mut socket, &who, msg).await
 	    },
 	    else => {
@@ -53,7 +53,11 @@ pub async fn handle_socket(
     }
 }
 
-async fn process_gs_msg(socket: &mut WebSocket, who: &SocketAddr, msg: GSMsg) {
+async fn process_gs_msg(
+    socket: &mut WebSocket,
+    who: &SocketAddr,
+    msg: GSMsg
+) {
     match msg {
 	GSMsg::NewLine(line) => {
 	    socket.send(Message::Text(line_to_json(&line))).await.unwrap();
@@ -75,32 +79,30 @@ async fn process_ws_msg(
     msg: Message
 ) -> ControlFlow<(),()> {
     match msg {
-	Text(text) => {
-	    match serde_json::from_str(&text) {
-		Ok(json) => {
-		    tracing::debug!("{who}: '{:?}'", json);
-		    match handle_ws_msg(line, json) {
-			Ok(Some(req)) => gs_tx.send(req).await.unwrap(),
-			Ok(None) => {},
-			Err(err) => {
-			    tracing::warn!("{who}: message error: {err}");
-			}
+	Text(text) => match serde_json::from_str(&text) {
+	    Ok(json) => {
+		tracing::debug!("{who}: '{json:?}'");
+		match handle_ws_msg(line, json) {
+		    Ok(Some(req)) => gs_tx.send(req).await.unwrap(),
+		    Ok(None) => {},
+		    Err(err) => {
+			tracing::warn!("{who}: message error: {err}");
 		    }
-		},
-		Err(err) => {
-		    tracing::warn!("{who}: can't parse JSON: {err}");
 		}
+	    },
+	    Err(err) => {
+		tracing::warn!("{who}: can't parse JSON: {err}");
 	    }
 	},
 	Close(close) => {
-	    tracing::info!("{who}: closing: {:?}", close);
+	    tracing::info!("{who}: closing: {close:?}");
 	    gs_tx.send(GSMsg::DeleteClient(*who)).await.unwrap();
 	    return ControlFlow::Break(());
 	},
 	_ => {
-	    tracing::warn!("{who}: can't handle message: {:?}", msg);
+	    tracing::warn!("{who}: can't handle message: {msg:?}");
 	}
-    }
+    };
     ControlFlow::Continue(())
 }
 
@@ -121,13 +123,13 @@ fn handle_ws_msg(
 	},
 	JMsg::Stroke => {
 	    if line.len() > 1 {
-		let line2 = simplify_line(line);
+		let simple_line = simplify_line(line);
 		*line = vec![];		
-		return Ok(Some(GSMsg::NewLine(line2)));
+		return Ok(Some(GSMsg::NewLine(simple_line)));
 	    }
 	},
 	JMsg::Line{..} => {
-	    tracing::warn!("recieved a line message O_o");
+	    return Err("recieved a line message O_o");
 	}
     };
     Ok(None)
@@ -135,9 +137,7 @@ fn handle_ws_msg(
 
 fn line_to_json(line: &Line) -> String {
     let line = line.iter()
-	.map(| (x, y, c) | {
-	    (*x, *y, format!("#{:06x}", c))
-	})
+	.map(| (x, y, c) | (*x, *y, format!("#{:06x}", c)))
 	.collect();    
     serde_json::to_string(&JMsg::Line{ line }).unwrap()
 }