Ultima Online Sphere Server Info Packet

sphereServInfo.js

'use strict'

const net = require('net')

module.exports = {

  totalPlayers: function (loginserv, port = 2593) {
    const client = new net.Socket()

    client.on('close', () => {
      console.log('Socket closed')
    })

    const connOpt = {
      host: loginserv,
      port: port
    }

    client.setTimeout(500)
    client.connect(connOpt, () => {
      console.log(`Socket connected: ${loginserv}:${port}`)
    })

    const promise = new Promise((resolve, reject) => {
      try {
        client.write(Buffer.from('22', 'hex'))
        client.on('data', (data) => {
          const res = data.toString().split('=')[3].split(',')[0]
          client.destroy()
          resolve(res)
        })
        client.on('timeout', () => {
          console.log('Socket timeout')
          client.destroy()
          resolve('timeout')
        })
        client.on('error', (err) => {
          client.destroy()
          console.log(err)
          resolve('err')
        })
      } catch (e) {
        client.destroy()
        reject(e)
      }
    })

    return promise
  }

}