Node.js で Google Home Mini のIPアドレスを取得する

import mdns, { Service } from 'mdns'

/* ts
export function getServiceCb(
  name: string,
  callback: (err: unknown, service: Service | null) => void
) {
*/
export function getServiceCb(name callback) {
  const browser = mdns.createBrowser(mdns.tcp(name))

  try {
    browser.start()
    browser.on('serviceUp', (info) => {
      callback(null, info)
      browser.stop()
    })
  } catch (e) {
    callback(e, null)
  }
}

const getServicePromise = promisify(getServiceCb)

export async function getGoogleHomeIp() {
  const service = await getServicePromise('googlecast')

  if (!service) return null

  return service.addresses[0]
}

const ip = await getGoogleHomeIp()
console.log(ip)
// => XXX.XXX.XXX.XXX

import mdns, { Service } from 'mdns'
import pEvent from 'p-event' // < 5 (without EMS)
// import { pEvent } from 'p-event' >= 5 (require EMS)

export async function getService(name: string) {
  const browser = mdns.createBrowser(mdns.tcp(name))

  browser.start()
  const service = await pEvent<'serviceUp', Service>(browser, 'serviceUp')
  browser.stop()

  return service
}

export async function getGoogleHomeIp() {
  const service = await getService('googlecast')

  return service.addresses[0]
}

{
  interfaceIndex: 6,
  type: ServiceType {
    name: 'googlecast',
    protocol: 'tcp',
    subtypes: [],
    fullyQualified: true
  },
  replyDomain: 'local.',
  flags: 2,
  name: 'Google-Nest-Mini-FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF',
  networkInterface: 'en0',
  fullname: 'Google-Nest-Mini-FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF._googlecast._tcp.local.',
  host: 'ffffffffffffffffffffffffffffffffffff.local.',
  port: 0,
  rawTxtRecord: <Buffer ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ... 156 more bytes>,
  txtRecord: {
    id: 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF',
    cd: 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF',
    rm: 'FFFFFFFFFFFFFFFF',
    ve: '05',
    md: 'Google Nest Mini',
    ic: '/setup/icon.png',
    fn: 'ダイニング ルーム',
    ca: '000000',
    st: '0',
    bs: 'FFFFFFFFFFFF',
    nf: '1',
    rs: ''
  },
  addresses: [ '0.0.0.0' ]
}