eval-server/index.js

const { VM } = require('vm2')
const { Server } = require('socket.io')
const util = require('util')
const { stylize } = require('./colors')
const { Worker } = require('worker_threads')
const path = require('path')

const io = new Server(3069)

io.on('connection', (socket) => {
    let worker

    function reset () {
        worker = new Worker(path.join(__dirname, 'vm.js'))

        worker.on('message', (msg) => {
            switch (msg.type) {
                case 'socketEmit':
                    socket.emit(...msg.data)

                    break
                case 'socketOnce':
                    socket.once(...msg.data)

                    break
            }
        })
    }

    reset()

    socket.on('setFunctions', (jsonArray) => {
        worker.postMessage({ type: 'setFunctions', jsonArray })
    })

    socket.on('runCode', (transactionId, code) => {
        worker.postMessage({ type: 'runCode', code })

        worker.on('message', ({ type, error, output }) => {
            if (type !== 'codeOutput') return

            socket.emit('codeOutput', transactionId, error, output)
        })
    })

    socket.on('reset', reset)
})

process.on('uncaughtException', (e) => {
    console.log(`Caught an uncaught exception!\n${e.stack}`)
})