testing EventEmitter

app.js

@@ -1,3 +1,4 @@
+import { EventEmitter } from 'events';
 import Hyperswarm from 'hyperswarm';
 import crypto from 'hypercore-crypto';
 import b4a from 'b4a';
@@ -12,16 +13,20 @@ const drive = new Hyperdrive(store);
 
 await drive.ready();
 
-let swarm;
+class ChatHandler extends EventEmitter {
-let userName = 'Anonymous';
+  constructor() {
-let userAvatar = '';
+    super();
-let registeredUsers = JSON.parse(localStorage.getItem('registeredUsers')) || {};
+    this.userName = 'Anonymous';
-let peerCount = 0;
+    this.userAvatar = '';
-let currentRoom = null;
+    this.registeredUsers = JSON.parse(localStorage.getItem('registeredUsers')) || {};
+    this.peerCount = 0;
+    this.currentRoom = null;
+    this.swarm = new Hyperswarm();
 
-async function initialize() {
+    this.initialize();
-  swarm = new Hyperswarm();
+  }
 
+  async initialize() {
     const servePort = 1337;
     const serve = new ServeDrive({ port: servePort, get: ({ key, filename, version }) => drive });
     await serve.ready();
@@ -36,7 +41,7 @@ async function initialize() {
     const removeRoomBtn = document.querySelector('#remove-room-btn');
 
     if (registerForm) {
-    registerForm.addEventListener('submit', registerUser);
+      registerForm.addEventListener('submit', (e) => this.registerUser(e));
     }
     if (selectAvatarButton) {
       selectAvatarButton.addEventListener('click', () => {
@@ -44,19 +49,19 @@ async function initialize() {
       });
     }
     if (createChatRoomButton) {
-    createChatRoomButton.addEventListener('click', createChatRoom);
+      createChatRoomButton.addEventListener('click', () => this.createChatRoom());
     }
     if (joinChatRoomButton) {
-    joinChatRoomButton.addEventListener('click', joinChatRoom);
+      joinChatRoomButton.addEventListener('click', (e) => this.joinChatRoom(e));
     }
     if (messageForm) {
-    messageForm.addEventListener('submit', sendMessage);
+      messageForm.addEventListener('submit', (e) => this.sendMessage(e));
     }
     if (toggleSetupBtn) {
-    toggleSetupBtn.addEventListener('click', toggleSetupView);
+      toggleSetupBtn.addEventListener('click', () => this.toggleSetupView());
     }
     if (removeRoomBtn) {
-    removeRoomBtn.addEventListener('click', leaveRoom);
+      removeRoomBtn.addEventListener('click', () => this.leaveRoom());
     }
 
     const registerDiv = document.querySelector('#register');
@@ -64,52 +69,43 @@ async function initialize() {
       registerDiv.classList.remove('hidden');
     }
 
-  swarm.on('connection', async (connection, info) => {
+    this.swarm.on('connection', async (connection, info) => {
-    peerCount++;
+      this.peerCount++;
-    updatePeerCount();
+      this.updatePeerCount();
 
-    const iconBuffer = await drive.get(`/icons/${userName}.png`);
+      const iconBuffer = await drive.get(`/icons/${this.userName}.png`);
       if (iconBuffer) {
         const iconMessage = JSON.stringify({
           type: 'icon',
-        username: userName,
+          username: this.userName,
           avatar: iconBuffer.toString('base64'),
         });
         connection.write(iconMessage);
       }
 
-    connection.on('data', async (data) => {
+      connection.on('data', (data) => this.emit('onMessage', data, connection));
-      const messageObj = JSON.parse(data.toString());
-      if (messageObj.type === 'icon') {
-        const username = messageObj.username;
-        const avatarBuffer = Buffer.from(messageObj.avatar, 'base64');
-        await drive.put(`/icons/${username}.png`, avatarBuffer);
-        updateIcon(username, avatarBuffer);
-      } else {
-        onMessageAdded(messageObj.name, messageObj.message, messageObj.avatar);
-      }
-    });
-
       connection.on('close', () => {
-      peerCount--;
+        this.peerCount--;
-      updatePeerCount();
+        this.updatePeerCount();
       });
     });
 
-  swarm.on('error', (err) => {
+    this.swarm.on('error', (err) => {
       console.error('Swarm error:', err);
     });
 
-  swarm.on('close', () => {
+    this.swarm.on('close', () => {
       console.log('Swarm closed');
     });
-}
 
-function registerUser(e) {
+    this.on('onMessage', async (data, connection) => this.handleMessage(data, connection));
+  }
+
+  async registerUser(e) {
     e.preventDefault();
     const regUsername = document.querySelector('#reg-username').value;
 
-  if (registeredUsers[regUsername]) {
+    if (this.registeredUsers[regUsername]) {
       alert('Username already taken. Please choose another.');
       return;
     }
@@ -120,18 +116,18 @@ function registerUser(e) {
       reader.onload = (event) => {
         const buffer = new Uint8Array(event.target.result);
         drive.put(`/icons/${regUsername}.png`, buffer);
-      userAvatar = URL.createObjectURL(new Blob([buffer]));
+        this.userAvatar = URL.createObjectURL(new Blob([buffer]));
-      registeredUsers[regUsername] = userAvatar;
+        this.registeredUsers[regUsername] = this.userAvatar;
-      localStorage.setItem('registeredUsers', JSON.stringify(registeredUsers));
+        localStorage.setItem('registeredUsers', JSON.stringify(this.registeredUsers));
-      continueRegistration(regUsername);
+        this.continueRegistration(regUsername);
       };
       reader.readAsArrayBuffer(avatarFile);
     } else {
-    continueRegistration(regUsername);
+      this.continueRegistration(regUsername);
+    }
   }
-}
 
-async function continueRegistration(regUsername) {
+  async continueRegistration(regUsername) {
     const loadingDiv = document.querySelector('#loading');
     const setupDiv = document.querySelector('#setup');
 
@@ -140,39 +136,39 @@ async function continueRegistration(regUsername) {
       return;
     }
 
-  userName = regUsername;
+    this.userName = regUsername;
     setupDiv.classList.remove('hidden');
     document.querySelector('#register').classList.add('hidden');
     loadingDiv.classList.add('hidden');
 
     const randomTopic = crypto.randomBytes(32);
-  document.querySelector('#chat-room-topic').innerText = truncateHash(b4a.toString(randomTopic, 'hex'));
+    document.querySelector('#chat-room-topic').innerText = this.truncateHash(b4a.toString(randomTopic, 'hex'));
-}
+  }
 
-async function createChatRoom() {
+  async createChatRoom() {
     const topicBuffer = crypto.randomBytes(32);
     const topic = b4a.toString(topicBuffer, 'hex');
-  addRoomToList(topic);
+    this.addRoomToList(topic);
-  joinSwarm(topicBuffer);
+    this.joinSwarm(topicBuffer);
-}
+  }
 
-async function joinChatRoom(e) {
+  async joinChatRoom(e) {
     e.preventDefault();
     const topicStr = document.querySelector('#join-chat-room-topic').value;
     const topicBuffer = b4a.from(topicStr, 'hex');
-  addRoomToList(topicStr);
+    this.addRoomToList(topicStr);
-  joinSwarm(topicBuffer);
+    this.joinSwarm(topicBuffer);
-}
+  }
 
-async function joinSwarm(topicBuffer) {
+  async joinSwarm(topicBuffer) {
-  if (currentRoom) {
+    if (this.currentRoom) {
-    currentRoom.destroy();
+      this.currentRoom.destroy();
     }
 
     document.querySelector('#setup').classList.add('hidden');
     document.querySelector('#loading').classList.remove('hidden');
 
-  const discovery = swarm.join(topicBuffer, { client: true, server: true });
+    const discovery = this.swarm.join(topicBuffer, { client: true, server: true });
     await discovery.flushed();
 
     const topic = b4a.toString(topicBuffer, 'hex');
@@ -180,65 +176,77 @@ async function joinSwarm(topicBuffer) {
     document.querySelector('#loading').classList.add('hidden');
     document.querySelector('#chat').classList.remove('hidden');
 
-  currentRoom = discovery;
+    this.currentRoom = discovery;
-  clearMessages();
+    this.clearMessages();
-}
+  }
 
-function addRoomToList(topic) {
+  addRoomToList(topic) {
     const roomList = document.querySelector('#room-list');
     const roomItem = document.createElement('li');
-  roomItem.textContent = truncateHash(topic);
+    roomItem.textContent = this.truncateHash(topic);
     roomItem.dataset.topic = topic;
-  roomItem.addEventListener('click', () => switchRoom(topic));
+    roomItem.addEventListener('click', () => this.switchRoom(topic));
     roomList.appendChild(roomItem);
-}
+  }
 
-function switchRoom(topic) {
+  switchRoom(topic) {
     const topicBuffer = b4a.from(topic, 'hex');
-  joinSwarm(topicBuffer);
+    this.joinSwarm(topicBuffer);
-}
+  }
 
-function leaveRoom() {
+  leaveRoom() {
-  if (currentRoom) {
+    if (this.currentRoom) {
-    const topic = b4a.toString(currentRoom.topic, 'hex');
+      const topic = b4a.toString(this.currentRoom.topic, 'hex');
       const roomItem = document.querySelector(`li[data-topic="${topic}"]`);
       if (roomItem) {
         roomItem.remove();
       }
-    currentRoom.destroy();
+      this.currentRoom.destroy();
-    currentRoom = null;
+      this.currentRoom = null;
     }
     document.querySelector('#chat').classList.add('hidden');
     document.querySelector('#setup').classList.remove('hidden');
-}
+  }
 
-function sendMessage(e) {
+  sendMessage(e) {
     e.preventDefault();
     const message = document.querySelector('#message').value;
     document.querySelector('#message').value = '';
 
-  onMessageAdded(userName, message, userAvatar);
+    this.onMessageAdded(this.userName, message, this.userAvatar);
 
     const messageObj = JSON.stringify({
       type: 'message',
-    name: userName,
+      name: this.userName,
       message,
-    avatar: userAvatar,
+      avatar: this.userAvatar,
       timestamp: Date.now(),
     });
 
-  const peers = [...swarm.connections];
+    const peers = [...this.swarm.connections];
     for (const peer of peers) {
       peer.write(messageObj);
     }
-}
+  }
 
-function scrollToBottom() {
+  async handleMessage(data, connection) {
+    const messageObj = JSON.parse(data.toString());
+    if (messageObj.type === 'icon') {
+      const username = messageObj.username;
+      const avatarBuffer = Buffer.from(messageObj.avatar, 'base64');
+      await drive.put(`/icons/${username}.png`, avatarBuffer);
+      this.updateIcon(username, avatarBuffer);
+    } else {
+      this.onMessageAdded(messageObj.name, messageObj.message, messageObj.avatar);
+    }
+  }
+
+  scrollToBottom() {
     var container = document.getElementById("messages-container");
     container.scrollTop = container.scrollHeight;
-}
+  }
 
-function onMessageAdded(from, message, avatar) {
+  onMessageAdded(from, message, avatar) {
     const $div = document.createElement('div');
     $div.classList.add('message');
 
@@ -265,30 +273,35 @@ function onMessageAdded(from, message, avatar) {
     $div.appendChild($content);
 
     document.querySelector('#messages').appendChild($div);
-  scrollToBottom();
+    this.scrollToBottom();
-}
+  }
 
-function truncateHash(hash) {
+  truncateHash(hash) {
     return `${hash.slice(0, 6)}...${hash.slice(-6)}`;
-}
+  }
 
-async function updateIcon(username, avatarBuffer) {
+  async updateIcon(username, avatarBuffer) {
     const userIcon = document.querySelector(`img[src*="${username}.png"]`);
     if (userIcon) {
       userIcon.src = URL.createObjectURL(new Blob([avatarBuffer]));
     }
-}
+  }
 
-function clearMessages() {
+  clearMessages() {
     const messagesContainer = document.querySelector('#messages');
     while (messagesContainer.firstChild) {
       messagesContainer.removeChild(messagesContainer.firstChild);
     }
-}
+  }
 
-function toggleSetupView() {
+  toggleSetupView() {
     const setupDiv = document.querySelector('#setup');
     setupDiv.classList.toggle('hidden');
+  }
+
+  updatePeerCount() {
+    // Implement this method based on your needs to update the peer count in the UI
+  }
 }
 
-initialize();
+new ChatHandler();