server.js

require("dotenv").config();

const http = require("http");
const logger = require("morgan");
const express = require("express");
const mongoose = require("mongoose");
const cors = require("cors");

const port = 3000;
const app = express();
const server = http.createServer(app);

const { botListener } = require("./index");

const mongoURI = "mongodb://mongo:27017/bookmarkerbot";
mongoose.connect(mongoURI, { useNewUrlParser: true });

const onError = (error) => {
  if (error.syscall !== "listen") {
    throw error;
  }

  const bind = `Port ${port}`;

  switch (error.code) {
    case "EACCES":
      console.log(`${bind} requires elevated privileges`);
      process.exit(1);
      break;
    case "EADDRINUSE":
      console.log(`${bind} is already in use`);
      process.exit(1);
    default:
      throw error;
  }
};

const onListening = () => {
  const addr = server.address();
  const bind = `port ${addr.port}`;

  console.log(`Listening on ${bind}`);
};

server.listen(port);
server.on("error", onError);
server.on("listening", onListening);

app.use(logger("dev"));
app.use(express.json());
app.use(cors());

botListener();