Service Status Check

service-check.js

const dns = require('dns')
const net = require('net')

let checks = [
  { name: 'NA Login Servers', dns: 'auth1.101.arenanetworks.com', port: 6112 },
  { name: 'EU Login Servers', dns: 'auth2.101.arenanetworks.com', port: 6112 },
]

const getStatus = (item) => {
  return new Promise((resolve, reject) => {
    dns.resolve4(item.dns, (err, ips) => {
      Promise.all(ips.map(x => {
        return new Promise((resolve, reject) => {
          let s = new net.Socket()
          s.setTimeout(2000,() => {
            s.destroy()
            resolve({ip:x,status:'timeout'})
          })
          s.connect(item.port, x, () => {
            s.end()
            resolve({ip:x,status:'up'})
          })
          s.on('error', (err) => {
            s.destroy()
            resolve({ip:x,status:'error'})
          })
        })
      })).then(results => {
        item.results = results
        resolve(item)
      }).catch(console.error)
    })
  })
}

Promise.all(checks.map(x => { return getStatus(x) })).then(console.log)