feat: websocket init

websockets/.env.example

@@ -0,0 +1 @@
+PORT=

websockets/events/connection.js

@@ -1,5 +1,46 @@
+import { addUser, removeUser } from "../state/connection";
+
+const HEARTBEAT_INTERVAL = 30000; // 30 seconds
+const HEARTBEAT_TIMEOUT = 10000; // 10 seconds
+
 export const handleConnectionEvents = (io, socket) => {
-  socket.on("echo", (msg) => {
+  let heartbeatInterval;
-    socket.emit("echo", msg);
+  let heartbeatTimeout;
+  const startHeartbeat = () => {
+    heartbeatInterval = setInterval(() => {
+      socket.emit("heartbeat");
+
+      heartbeatTimeout = setTimeout(() => {
+        console.log(
+          `[Heartbeat] No response from ${socket.id}, disconnecting...`
+        );
+        socket.disconnect(true);
+      }, HEARTBEAT_TIMEOUT);
+    }, HEARTBEAT_INTERVAL);
+  };
+
+  socket.on("heartbeat_ack", () => {
+    clearTimeout(heartbeatTimeout);
+    console.log(`[Heartbeat] Received pong from ${socket.id}`);
+  });
+
+  socket.on("join", (user) => {
+    addUser(socket, user);
+    console.log(`[Connection] User ${user.name} has joined the server`);
+    console.log(`[Connection] ${getUserCount()} users online`);
+  });
+
+  socket.on("leave", () => {
+    const user = removeUser(socket.id);
+    if (user) {
+      console.log(`[Connection] User ${user.name} has left the server`);
+      console.log(`[Connection] ${getUserCount()} users online`);
+    }
+  });
+
+  socket.on("disconnect", () => {
+    console.log("Connection Lost:", socket.id);
+    removeUser(socket.id);
+    console.log(`[Connection] ${getUserCount()} users online`);
   });
 };

websockets/state/connection.js

@@ -0,0 +1,19 @@
+const users = new Map();
+
+export const addUser = (socket, user) => {
+  users.set(socket.id, user);
+};
+
+export const removeUser = (socketID) => {
+  const userToDelete = { ...users.get(socketID) };
+  users.delete(socketID);
+  return userToDelete;
+};
+
+export const getUser = (socketID) => {
+  return users.get(socketID);
+};
+
+export const getUserCount = () => {
+  return users.size;
+};