server.js

const path = require("path");
const http = require("http");
const express = require("express");
const socketio = require("socket.io");
const formatMessage = require("./utils/messages");
const createAdapter = require("@socket.io/redis-adapter").createAdapter;
const redis = require("redis");
const dotenv = require("dotenv");
const cors = require("cors");
const date = new Date();
require("dotenv").config();
const { createClient } = redis;
const {
  userJoin,
  getCurrentUser,
  userLeave,
  getRoomUsers,
} = require("./utils/users");

const app = express();
const server = http.createServer(app);
const io = socketio(server);

app.use(express.static(path.join(__dirname, "public")));

const botName = "Mentomatch Chat";

(async () => {
  pubClient = createClient({
    url: process.env.REDIS_ENDPOINT_URL,
  });
  await pubClient.connect();
  subClient = pubClient.duplicate();
  io.adapter(createAdapter(pubClient, subClient));
})();

io.on("connection", (socket) => {
  console.log(io.of("/").adapter);
  socket.on("joinRoom", ({ username, room }) => {
    const user = userJoin(socket.id, username, room);
    socket.join(user.room);

    socket.emit(
      "message",
      formatMessage(botName, "Welcome to Mentomatch Chat!")
    );

    socket.broadcast
      .to(user.room)
      .emit(
        "message",
        formatMessage(botName, `${user.username} has joined the chat`)
      );

    io.to(user.room).emit("roomUsers", {
      room: user.room,
      users: getRoomUsers(user.room),
    });
  });

  socket.on("chatMessage", (msg) => {
    const user = getCurrentUser(socket.id);
    io.to(user.room).emit("message", formatMessage(user.username, msg));
  });

  socket.on("disconnect", () => {
    const user = userLeave(socket.id);

    if (user) {
      io.to(user.room).emit(
        "message",
        formatMessage(botName, `${user.username} has left the chat`)
      );

      io.to(user.room).emit("roomUsers", {
        room: user.room,
        users: getRoomUsers(user.room),
      });
    }
  });
});

const PORT = process.env.PORT || 3000;

server.listen(PORT, () =>
  console.log(
    `Server running on port ${PORT}\nDeployment available at http://localhost:${PORT}`
  )
);