js-libp2p/examples/echo/test.js

import path from 'path'
import execa from 'execa'
import pDefer from 'p-defer'
import { toString as uint8ArrayToString } from 'uint8arrays/to-string'
import { fileURLToPath } from 'url'

const __dirname = path.dirname(fileURLToPath(import.meta.url))

function startProcess(name) {
  return execa('node', [path.join(__dirname, name)], {
    cwd: path.resolve(__dirname),
    all: true
  })
}

export async function test () {
  const listenerReady = pDefer()
  const messageReceived = pDefer()

  // Step 1 process
  process.stdout.write('node listener.js\n')
  const listenerProc = startProcess('src/listener.js')
  listenerProc.all.on('data', async (data) => {
    process.stdout.write(data)
    const s = uint8ArrayToString(data)

    if (s.includes('Listener ready, listening on:')) {
      listenerReady.resolve()
    }
  })

  await listenerReady.promise
  process.stdout.write('==================================================================\n')

  // Step 2 process
  process.stdout.write('node dialer.js\n')
  const dialerProc = startProcess('src/dialer.js')
  dialerProc.all.on('data', async (data) => {
    process.stdout.write(data)
    const s = uint8ArrayToString(data)

    if (s.includes('received echo:')) {
      messageReceived.resolve()
    }
  })

  await messageReceived.promise
  process.stdout.write('echo message received\n')

  listenerProc.kill()
  dialerProc.kill()
  await Promise.all([
    listenerProc,
    dialerProc
  ]).catch((err) => {
    if (err.signal !== 'SIGTERM') {
      throw err
    }
  })
}