autocannon/lib/preload/autocannonDetectPort.js

Fast HTTP benchmarking tool written in Node.js

'use strict'

const onListen = require('on-net-listen')
const net = require('net')

const socket = net.connect(process.env.AUTOCANNON_SOCKET)

onListen(function (addr) {
  this.destroy()
  const port = Buffer.from(addr.port + '')
  socket.write(port)
})

socket.unref()