Example node server with python compilation support

python_support.js

var spawn = require("child_process").spawn;
var fs = require('fs');


var runPythonFile = function (filepath, fileName, stdin, callback, process_list) {

        var proc1 = spawn('python3', [filepath + fileName + '.py']);
        var stdout1 = "";
        var stderr1 = "";
        
        if (stdin) {
            proc1.stdin.write(stdin + "\n");
            proc1.stdin.end();
        }
        proc1.stdout.on('data', function (_stdout) {
            stdout1 += _stdout;
        });
        proc1.stdout.on('end', function () {
            fl = true;
        });
        proc1.stderr.on('data', function (_stderr) {
            stderr1 += _stderr;
        });
        proc1.stderr.on('end', function () {
            console.log(stderr1);
        });
        proc1.on('close', function (code) {
            if (code == 0) callback(stdout1, "", "");
            else {
                console.log(stdout1)
                callback("", stderr1, "");
            }

        });
        console.log("PYTHON-------------------------------------------")
        console.log(proc1);
        process_list.push(proc1);
    }
    /*Async function to run py code and pass stdout,stderr to the callback fn*/
var runPython = function (code, stdin, callback, process_list) {
    if (!fs.existsSync('./code')) {
        fs.mkdirSync('./code', 0744);
    }
    if (!fs.existsSync('./code/python')) {
        fs.mkdirSync('./code/python', 0744);
    }

    var fileName = 'Source-' + Math.floor(Math.random() * 100000) + '-' + new Date().getTime();
    fs.writeFile('./code/python/' + fileName + '.py', code, function (err) {
        if (!err) {
            runPythonFile('./code/python/', fileName, stdin, function (stdout, stderr) {
                //do nothing
            }, process_list);
        }
        else {
            console.log(err);
            callback("", "", "Couldn't write the file!");
        }
    });
}


module.exports = {
    runPython: runPython
    , runPythonFile: runPythonFile
}

server.js

const express = require('express');

const bodyParser = require('body-parser')

const app = express();

const port = 8080;

const python_support = require('./python_support.js');

var process_list = new Array(); // Creating an array to save bots and their processes in 

var code = `import requests
import time
time.sleep(1);
r = requests.get('http://localhost:8080/feedback')
while True:
	print('test');
	time.sleep(1);
`;

app.listen(port, ()=>{
	console.log('We are live on ' + port);
})

app.get('/on', (req, res) => {
    
    // Try to instantiate bot process
    python_support.runPython(code, "", function (stdout, stderr) {
		callback(stdout, stderr, "");
    }, process_list);

    // notify on failed?

    // Feedback
	res.send('Bot process instantiated');


});

app.get('/off', (req, res) =>{

	console.log("NODE-------------------------------------------");
	console.log(process_list[0]);
	process_list[0].stdin.pause();
	process_list[0].kill();
	console.log('Process 0 killed');

})

app.get('/feedback', (req, res) =>{
	console.log("FEEDBACK-------------------------------------------")
	console.log('Feedback received from python program');
	res.send('ok');
})