server.js

const express = require("express");
const app = express();

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

const version = "v2";
const desc = "Simple server; With Signal intercept"
const message = `Build:\n-version: ${version}\n-description: ${desc}\n`;

function handleShutdown(signal) {
  console.log(`${signal} signal received`);
  server.close(() => {
    console.log('HTTP server closed');
    console.log("hello-world app shutting down");
    process.exit();
  });
}

app.get("/", (req, res) => {
  console.log(`hello-world called (${version})`);
  res.send(`Hello World ! (version ${version})\n`);
});

const server = app.listen(PORT, () => {
  console.log(message);
  console.log(`Process ID: ${process.pid}`);
  console.log(`Server version is running on http://localhost:${PORT}`);
});

// https://thomashunter.name/posts/2021-03-08-the-death-of-a-nodejs-process
process.on('SIGINT', handleShutdown);
process.on('SIGTERM', handleShutdown);

module.exports = app;