LinkUp-P2P-Chat/chatBot/includes/Client.js

import Hyperswarm from 'hyperswarm';
import EventEmitter from 'node:events';
import b4a from "b4a";
import TextMessage from "./TextMessage.js";
import FileMessage from "./FileMessage.js";

class Client extends EventEmitter {
  constructor(botName) {
    super();
    if (!botName) return console.error("Bot Name is not defined!");
    this.botName = botName;
    this.swarm = new Hyperswarm();
    this.joinedRooms = new Set(); // Track the rooms the bot has joined
    this.currentTopic = null; // Track the current topic
    this.setupSwarm();

    process.on('exit', () => {
      console.log('EXIT signal received. Shutting down HyperSwarm...');
      this.destroy();
    });

    process.on('SIGTERM', () => {
      console.log('SIGTERM signal received. Shutting down HyperSwarm...');
      this.destroy().then(() => {
        console.log('HyperSwarm was shut down. Exiting the process with exit code 0.');
        process.exit(0);
      });
    });

    process.on('SIGINT', () => {
      console.log('SIGINT signal received. Shutting down HyperSwarm...');
      this.destroy().then(() => {
        console.log('HyperSwarm was shut down. Exiting the process with exit code 0.');
        process.exit(0);
      });
    });
  }

  setupSwarm() {
    this.swarm.on('connection', (peer) => {
      peer.on('data', message => {
        const messageObj = JSON.parse(message.toString());
        if (this.joinedRooms.has(messageObj.topic)) { // Process message only if it is from a joined room
          this.currentTopic = messageObj.topic; // Set the current topic from the incoming message
          if (messageObj.type === "message")
            this.emit('onMessage', peer, new TextMessage(messageObj.name, messageObj.avatar, messageObj.topic, messageObj.message, messageObj.timestamp));

          if (messageObj.type === "file")
            this.emit('onFile', peer, new FileMessage(messageObj.name, messageObj.fileName, messageObj.fileUrl, messageObj.fileType, messageObj.avatar, messageObj.topic, messageObj.timestamp));

          if (messageObj.type === "icon")
            this.emit('onIcon', peer, messageObj);
        }
      });

      peer.on('error', e => {
        this.emit('onError', e);
        console.error(`Connection error: ${e}`)
      });
    });

    this.swarm.on('update', () => {
      console.log(`Connections count: ${this.swarm.connections.size} / Peers count: ${this.swarm.peers.size}`);
    });
  }

  joinChatRoom(chatRoomID) {
    if (!chatRoomID || typeof chatRoomID !== 'string') {
      return console.error("Invalid chat room ID!");
    }

    this.joinedRooms.add(chatRoomID); // Add the room to the list of joined rooms
    this.currentTopic = chatRoomID; // Store the current topic
    this.discovery = this.swarm.join(Buffer.from(chatRoomID, 'hex'), { client: true, server: true });
    this.discovery.flushed().then(() => {
      console.log(`Bot ${this.botName} joined the chat room.`);
      this.emit('onBotJoinRoom');
    });
  }

  sendTextMessage(message) {
    this.sendMessage(TextMessage.new(this, message));
  }

  sendMessage(message) {
    console.log('Bot name:', this.botName);
    const data = message.toJsonString();
    const peers = [...this.swarm.connections];
    for (const peer of peers) peer.write(data);
  }

  destroy() {
    this.swarm.destroy();
    console.log(`Bot ${this.botName} disconnected.`);
  }
}

export default Client;