server.js

const express = require('express')
const app = express()
const port = 3000

app.use(express.static('public'))
app.use(express.json())

var cors = require('cors')
app.use(cors())

// express osaa hakea index.html ilman tätä
//app.get('/', (req, res) => console.log("get"))


app.post('/move', function (req, res) {
  let position = req.body.position
  let depth = req.body.depth

  if (depth > 4) {
    res.status(400).send("Depth too deep")
    return false
  }

  requestMove(position, depth, (move) => {

    if (move === "error") {
      res.status(400)
    } else {
      res.send(move)
    }
  })

})

app.listen(process.env.PORT || port, () => console.log(`Example app listening on port ${port}!`))

function requestMove(pos, depth, callback) {
  const {spawn} = require('child_process');
  if (process.platform === "win32") {
    python = spawn('python', ["main.py", pos, depth])
  } else {
    python = spawn('python3', ["main.py", pos, depth])
  }

  let move = ""
  python.stdout.on('data', (data) => {
    move = JSON.parse(data)
    callback(move)
  })
  python.stderr.on('data', () => {
    callback("error")
  })
}