Ytukyg

Im new to Nodejs and was wondering why the functions execute out of order instead of how ive written it:

var tor_proxy = require("tor-request")

var s = require("sleep");



tor_proxy.setTorAddress("localhost", 9050);

tor_proxy.TorControlPort.password = "password";



function ShowIP() {

    tor_proxy.request("http://ident.me", function(err, response, body) {

        if(!err && response.statusCode == 200) {

              console.log(body);

        }

    });

}



function Renew() {

    tor_proxy.renewTorSession(function() { console.log("renewed"); });

}





ShowIP();

Renew();

ShowIP();



//Id Like It To Show The IP Then Renew Then Show The New IP

//But Instead It's Out Of Order

Nodejs is event driven (correct me if im wrong) and any help will be appreciated. Thanks :)

The script will be executed like this:

1. Inside ShowIP(), tor_proxy.request() sends a request to http://ident.me .


2. Without waiting for any reply from http://ident.me, function Renew() is executed.


3. 
   tor_proxy.renewTorSession() is likely to be an asynchronous function. If so, after it begins, the next ShowIP() will be executed without waiting for renewTorSession() to complete.

Depending on how fast http://ident.me replies and how fast renewTorSession() completes, the results may vary.

To execute these functions in proper order, you can search for the following keywords:

• Promise


• 
  Async/Await
  


• 
  util.promisify() from Node.js


• Libraries like Async.js
  

An example using promise, async and await:

var tor_proxy = require('tor-request');

tor_proxy.setTorAddress('localhost', 9050);

tor_proxy.TorControlPort.password = 'password';



function ShowIP() {

  return new Promise((resolve, reject) => {

    tor_proxy.request('http://ident.me', function (err, response, body) {

      if (err) reject(err);

      else if (response.statusCode !== 200) reject('response.statusCode: ' + response.statusCode);

      else {

        console.log(body);

        resolve();

      }

    });

  });

}



function Renew() {

  return new Promise((resolve, reject) => {

    tor_proxy.renewTorSession(() => {

      console.log('renewed');

      resolve();

    });

  });

}



async function testFunction() {

  // Await makes sure the returned promise completes before proceeding.

  // Note that await keyword can only be used inside async function.

  try {

    await ShowIP();

    await Renew();

    await ShowIP();

    console.log('done!');

  } catch (error) {

    console.log(error);

  }

}



testFunction();