import http from 'node:http';
import process from 'node:process';

const host = '127.0.0.1';
const port = 3000;
let shuttingDown = false;

const server = http.createServer((request, response) => {
  response.writeHead(200, { 'content-type': 'text/plain; charset=utf-8' });
  response.end('ready\n');
});

function shutdown(signal) {
  if (shuttingDown) {
    return;
  }

  shuttingDown = true;
  console.log(`received ${signal}, closing HTTP server`);

  const forceCloseTimer = setTimeout(() => {
    console.error('grace period expired, forcing connections closed');
    server.closeAllConnections();
    process.exit(1);
  }, 8000);
  forceCloseTimer.unref();

  server.close((error) => {
    clearTimeout(forceCloseTimer);

    if (error) {
      console.error(error);
      process.exitCode = 1;
      return;
    }

    console.log('HTTP server closed');
  });
}

process.on('SIGTERM', shutdown);
process.on('SIGINT', shutdown);

server.listen(port, host, () => {
  console.log(`listening on http://${host}:${port} pid=${process.pid}`);
});