Drill 17: Find the core line — Deploying a Node service

import { createServer } from 'node:http'

const port = Number(process.env.PORT ?? 3000)

const server = createServer((request, response) => {
  if (request.url === '/health') {
    response.writeHead(200, { 'content-type': 'application/json' })
    return response.end(JSON.stringify({ status: 'ok' }))
  }
  response.writeHead(404)
  response.end()
})

server.listen(port, () => {
  console.log('Listening on ' + port)
})

function shutdown(signal: string) {
  console.log('Received ' + signal + ', closing server')
  server.close(() => {
    console.log('Server closed')
    process.exit(0)
  })
  setTimeout(() => {
    console.error('Forced shutdown after timeout')
    process.exit(1)
  }, 10_000).unref()
}

process.on('SIGTERM', () => shutdown('SIGTERM'))
process.on('SIGINT', () => shutdown('SIGINT'))