Play with sockets

.vscode/settings.json

@@ -1,6 +1,7 @@
 {
 	"bun.debugTerminal.enabled": true,
 	"bun.debugTerminal.stopOnEntry": false,
+	"deno.enable": true,
 	"editor.formatOnSave": true,
 	"editor.defaultFormatter": "biomejs.biome",
 	"editor.codeActionsOnSave": {

server/deno.ts

@@ -0,0 +1,40 @@
+/// <reference lib="deno.ns" />
+
+const clientsMap = new Map<number, WebSocket>();
+let nextId = 1;
+
+const handleConnection = (socket: WebSocket): void => {
+	const id = nextId++;
+
+	socket.onopen = () => {
+		clientsMap.set(id, socket);
+		broadcast(`${id} has joined!`);
+	};
+
+	socket.onclose = () => {
+		clientsMap.delete(id);
+		broadcast(`${id} has left!`);
+	};
+
+	socket.onmessage = console.log;
+	socket.onerror = console.error;
+};
+
+function broadcast(message: string): void {
+	for (const socket of clientsMap.values()) {
+		if (socket.readyState === WebSocket.OPEN) {
+			socket.send(message);
+		}
+	}
+}
+
+Deno.serve({ port: 6969 }, (request) => {
+	if (request.headers.get("upgrade") !== "websocket") {
+		return new Response("Upgrade Required", { status: 426 });
+	}
+
+	const { socket, response } = Deno.upgradeWebSocket(request);
+	handleConnection(socket);
+
+	return response;
+});