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"Argument str must be a string" error in torrent streaming app [closed]

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I'm trying to build a torrent streaming api-thing, that streams you video files you download with torrents.
Here's my code:
import torrentStream from 'torrent-stream';
import rangeParser from 'range-parser';
import express from 'express';
const app = express();
const magnetURI = 'magnet:?xt=urn:btih:331B74F12A1CE8D00F0F8BE0844F5CC6471C925E&dn=The.Last.of.Us.S01E04.1080p.HMAX.WEBRip.DDP5.1.Atmos.x264-SMURF%5BTGx%5D&tr=udp%3A%2F%2Fopen.stealth.si%3A80%2Fannounce&tr=udp%3A%2F%2Ftracker.tiny-vps.com%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Fexplodie.org%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.cyberia.is%3A6969%2Fannounce&tr=udp%3A%2F%2Fipv4.tracker.harry.lu%3A80%2Fannounce&tr=udp%3A%2F%2Fp4p.arenabg.com%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.birkenwald.de%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.moeking.me%3A6969%2Fannounce&tr=udp%3A%2F%2Fopentor.org%3A2710%2Fannounce&tr=udp%3A%2F%2Ftracker.dler.org%3A6969%2Fannounce&tr=udp%3A%2F%2F9.rarbg.me%3A2970%2Fannounce&tr=https%3A%2F%2Ftracker.foreverpirates.co%3A443%2Fannounce&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=http%3A%2F%2Ftracker.openbittorrent.com%3A80%2Fannounce&tr=udp%3A%2F%2Fopentracker.i2p.rocks%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.internetwarriors.net%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969%2Fannounce&tr=udp%3A%2F%2Fcoppersurfer.tk%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.zer0day.to%3A1337%2Fannounce';
const engine = torrentStream(magnetURI, {
path: './downloads', // location to save the downloaded file
});
engine.on('ready', () => {
const files = engine.files;
// Only select the first video file (you may need to modify this depending on your torrent)
const videoFile = files.find((file) => {
return file.name.endsWith('.mp4') || file.name.endsWith('.mkv') || file.name.endsWith('.avi');
});
if (!videoFile) {
console.log('No video files found in the torrent.');
return;
}
console.log(`Streaming ${videoFile.name} (${videoFile.length} bytes)`);
app.get('/', (req, res) => {
// Set the content type of the response to the video MIME type
res.contentType(videoFile.name.split('.').pop());
// Get the range of bytes to stream from the request headers
const range = req.headers.range;
const parts = rangeParser(videoFile.length, range);
// Set the content range of the response to the range being sent
res.set('Content-Range', `bytes ${parts[0].start}-${parts[0].end}/${videoFile.length}`);
// Stream the file to the response
const stream = videoFile.createReadStream(parts[0]);
stream.pipe(res);
});
app.listen(3000, () => {
console.log('Server listening on port 3000.');
});
});
engine.on('download', (pieceIndex) => {
console.log(`Downloaded piece ${pieceIndex}.`);
});
engine.on('idle', () => {
console.log('Download complete.');
});
but it gave me this error:
TypeError: argument str must be a string
at rangeParser (G:\STREAMING-THING\node_modules\range-parser\index.js:29:11)
at file:///G:/STREAMING-THING/what.js:33:19
at Layer.handle [as handle_request] (G:\STREAMING-THING\node_modules\express\lib\router\layer.js:95:5)
at next (G:\STREAMING-THING\node_modules\express\lib\router\route.js:144:13)
at Route.dispatch (G:\STREAMING-THING\node_modules\express\lib\router\route.js:114:3)
at Layer.handle [as handle_request] (G:\STREAMING-THING\node_modules\express\lib\router\layer.js:95:5)
at G:\STREAMING-THING\node_modules\express\lib\router\index.js:284:15
at Function.process_params (G:\STREAMING-THING\node_modules\express\lib\router\index.js:346:12)
at next (G:\STREAMING-THING\node_modules\express\lib\router\index.js:280:10)
at expressInit (G:\STREAMING-THING\node_modules\express\lib\middleware\init.js:40:5)

problem when passing a callback in a res.render ()

I'm doing a small application bringing some data from some remote JSON files and the idea is to generate some statistics that are later printed in an EJS file.
I want to pass separately values ​​to render and then use them in the document ejs.
The server file works well, apart from that I have a module in which I develop the functions and a script where I have the routes and execute them:
//rapi.js
const extjson = require ('remote-json');
//---------------------API CONFIG--------------------------
//apikey
const apikey ="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
function get_sum_id(sumname, callback){
const urlsumbySumName = "https://la2.api.riotgames.com/lol/summoner/v3/summoners/by-name/" + sumname + "?api_key=" + apikey;
extjson(urlsumbySumName).get(callback);
}
function get_league_data(sumid, callback){
const urlgetleaguedata ="https://la2.api.riotgames.com/lol/league/v3/positions/by-summoner/"+ sumid + "?api_key="+ apikey;
extjson(urlgetleaguedata).get(callback)
}
module.exports = { get_sum_id, get_league_data};
//---------------------------------------------------------------------
//index.js
const riot = require('./rapi.js');
const express = require('express');
const router = express.Router();
router.get('/',async (req, res) => {
res.render('index');
});
router.post('/profile',async (req, res, next)=>{
const sum = req.body.summoners; //from html form
const sum_id = riot.get_sum_id(sum, function(err, resp, body){body.id});
res.render('profile', {sum,
id: sum_id,
league: riot.get_league_data(sum_id, function(err,resp,body){body})
});
});
module.exports = router;
what I want to do as seen there is to pass the value of that callback directly to the render and reference it. Obviously something I'm doing wrong since it does not work.
outputs:
> in localhost:3000/profile - internal server error. in console:
> TypeError:
> C:\xampp\htdocs\proyectos\legendsop\src\views\profile.ejs:80
> 78| <section class="row border">
> 79| <section class="col-2 border">Perfil</section>
> >> 80| <section class="col-1 border">SOLO/DUO Q <br><%= league[1].tier%></section>
> 81| <section class="col-1 border">FLEX <br><%= league[0].tier%></section>
> 82| <section class="col-4 border">WinRateRolCola</section>
> 83| <section class="col-2 border">EstadisticasCampeones</section>
>
> Cannot read property '1' of undefined
>
> at eval (eval at compile (C:\xampp\htdocs\proyectos\legendsop\node_modules\ejs\lib\ejs.js:618:12),
> <anonymous>:16:32)
> at returnedFn (C:\xampp\htdocs\proyectos\legendsop\node_modules\ejs\lib\ejs.js:653:17)
> at tryHandleCache (C:\xampp\htdocs\proyectos\legendsop\node_modules\ejs\lib\ejs.js:251:36)
> at View.exports.renderFile [as engine] (C:\xampp\htdocs\proyectos\legendsop\node_modules\ejs\lib\ejs.js:482:10)
> at View.render (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\view.js:135:8)
> at tryRender (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\application.js:640:10)
> at Function.render (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\application.js:592:3)
> at ServerResponse.render (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\response.js:1008:7)
> at router.post (C:\xampp\htdocs\proyectos\legendsop\src\routes\index.js:14:5)
> at Layer.handle [as handle_request] (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\router\layer.js:95:5)
> at next (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\router\route.js:137:13)
> at Route.dispatch (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\router\route.js:112:3)
> at Layer.handle [as handle_request] (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\router\layer.js:95:5)
> at C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\router\index.js:281:22
> at Function.process_params (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\router\index.js:335:12)
> at next (C:\xampp\htdocs\proyectos\legendsop\node_modules\express\lib\router\index.js:275:10)
>
> Git GitHub Initialize a new project directory with a Git repository
> Create repository
Excuse me if my English is not understood very well I am Spanish speaking.

This might help you
The purpose of the res.render callback argument
Render the ejs file in callback again
hope this helps
cheers

Hyperledger Sawtooth: Transaction processor in Javascript

I am trying to implement a transaction processor in javascript SDK based on the following example
https://github.com/hyperledger/sawtooth-core/blob/master/sdk/examples/intkey_javascript/index.js
Here is my code to run a transaction processor in javascript SDK
//validator public key
const validatorAddress = '024c512a6d66917d7d00f52fa299a88594915dab27bddbcd2a80154984d7948c3c';
const IntegerKeyHandler = require('./handler');
const startProcessor = function startProcessor(){
const transactionProcessor = new TransactionProcessor(validatorAddress);
transactionProcessor.addHandler(new IntegerKeyHandler())
transactionProcessor.start()
}
But i am getting invalid argument error
Error: Invalid argument
at exports.Socket.Socket.connect (/var/accubits-workspace/hypeerledger-sawtooth/tuts/node_modules/zeromq/lib/index.js:510:13)
at Stream.connect (/var/accubits-workspace/hypeerledger-sawtooth/tuts/node_modules/sawtooth-sdk/messaging/stream.js:85:18)
at TransactionProcessor.start (/var/accubits-workspace/hypeerledger-sawtooth/tuts/node_modules/sawtooth-sdk/processor/index.js:72:18)
at Object.startProcessor (/var/accubits-workspace/hypeerledger-sawtooth/tuts/helpers/transaction-processor.js:15:26)
at app.get (/var/accubits-workspace/hypeerledger-sawtooth/tuts/index.js:62:26)
at Layer.handle [as handle_request] (/var/accubits-workspace/hypeerledger-sawtooth/tuts/node_modules/express/lib/router/layer.js:95:5)
at next (/var/accubits-workspace/hypeerledger-sawtooth/tuts/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/var/accubits-workspace/hypeerledger-sawtooth/tuts/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/var/accubits-workspace/hypeerledger-sawtooth/tuts/node_modules/express/lib/router/layer.js:95:5)
at /var/accubits-workspace/hypeerledger-sawtooth/tuts/node_modules/express/lib/router/index.js:281:22

Change the validator address to the url of the validation which can be either tcp://validator:4004 or tcp://localhost:4004
Here's the full code:
'use strict'
const { TransactionProcessor } = require('sawtooth-sdk/processor')
const IntegerKeyHandler = require('./integer_key_handler')
const address = 'tcp://validator:4004' // If you are not running it inside docker container then change the address to this tcp://localhost:4004
const transactionProcessor = new TransactionProcessor(address);
transactionProcessor.addHandler(new IntegerKeyHandler());
transactionProcessor.start();

Monkeypatch res.send

From a college suggestion and following this answer
I'm trying to monkey patch res.send but I get the following error:
TypeError: Cannot read property 'req' of undefined
This is my code
const express = require('express')
const app = express()
app.use((req, res, next ) => {
const oldSend = res.send;
res.send = (data) => {
console.log(data.length);
oldSend(data);
}
next();
})
app.get('/', (req, res) => res.send('Hello World!'))
Full stacktrace:
Example app listening on port 3000!
undefined
TypeError: Cannot read property 'req' of undefined
at send (/Users/code/js/hello/node_modules/express/lib/response.js:110:17)
at ServerResponse.res.send (/Users/code/js/hello/index.js:8:9)
at app.get (/Users/code/js/hello/index.js:12:32)
at Layer.handle [as handle_request] (/Users/code/js/hello/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/code/js/hello/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/code/js/hello/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/code/js/hello/node_modules/express/lib/router/layer.js:95:5)
at /Users/code/js/hello/node_modules/express/lib/router/index.js:281:22
at Function.process_params (/Users/code/js/hello/node_modules/express/lib/router/index.js:335:12)
at next (/Users/code/js/hello/node_modules/express/lib/router/index.js:275:10)
Where line 110 is:
res.send = function send(body) {
var chunk = body;
var encoding;
var req = this.req; //<-- THIS
var type;
// settings
var app
....

It's because methods are not tied to their instances in JavaScript.
If you call a.fun(), inside the function code, this will initially be set to a. But this happens only because a appears in the method call: fun is otherwise an arbitrary function that has no relationship with a.
In your case, this should work:
oldSend.call(res, data);
The point of call() is to set this.

Found the solution, the oldSend loses it's context(?)
If I add bind(res):
const oldSend = res.send.bind(res);
The problem is gone.

TypeError thrown when library is included in express

I've come across a very peculiar bug that I can't seem to solve. In Node.js, I have an API wrapper library called Markitable:
var request = require('request');
var Q = require('q');
/**
* Markit on Demand API Client
* #constructor
* #author Chandler Freeman <chandler.freeman#gmail.com>
*/
var Markitable = function() {
};
module.exports = Markitable;
endpoints = {
lookup: 'http://dev.markitondemand.com/Api/v2/Lookup',
quote: 'http://dev.markitondemand.com/Api/v2/Quote',
interactivechart: 'http://dev.markitondemand.com/Api/v2/InteractiveChart'
};
/**
* Company lookup
* #httpMethod GET
* #param {ticker} String A string containing the ticker for the stock
* #param {callback} callback (Optional) If callback is passed, than the function will use callbacks
* #promises yes By default, this function uses promises
*/
Markitable.prototype.lookup = function(ticker, callback) {
var options = {
url: endpoints.lookup,
headers: this.headers,
qs: { 'input': ticker.toUpperCase() },
method: 'GET',
json: true
};
if (!callback) {
var d = Q.defer();
request(options, function(err, httpResponse, body) {
if (err) return d.reject(err);
d.resolve(body);
});
return d.promise;
}
else
request(options, callback);
};
As you can see, all it does is fetch data from the Markit on Demand API and return a Q promise. However, every time I include the
var Markitable = require('markitable');
statement anywhere in my code, when I navigate to the / route of my application I receive
Failure on / route: TypeError: Cannot read property 'user' of undefined
I am using Express I have absolutely no idea at all why this is happening; I've reread the source several times, checked source control changes, everything, yet I can't find the root of the issue. This behavior only persists when the library is included; as soon as I remove that statement, everything works perfectly. I don't understand because the code for this library was the exact same code I used from another library I wrote, and the first one looks great. Here is the code for my routes file:
var User = require('../app/models/user');
var Robinhood = require('marian');
var util = require('util');
var Q = require('q');
module.exports = function(app, passport) {
// =========================================
// Table of Contents(Search by name)
//
// 1. Root
//
// =========================================
// ********************* 1. Root *********************
app.get('/', isLoggedIn, asyncCallback(function*(req, res) {
rh = new Robinhood(req.user.local.rhtoken);
var viewData = { user : req.user };
try {
// e: <Cannot read property user of undefined>
viewData.rhUser = yield rh.getUser();
viewData.rhUser.basic_info = yield rh.getBasicInfo();
viewData.rhPortfolio = yield rh.getPortfolio();
viewData.getOrders = yield rh.getOrders();
viewData.rhAccount = yield rh.getAccount();
viewData.active = { page : 'dashboard' };
res.render('main_pages/maindashboard.ejs', viewData);
}
catch(e) {
console.log("Failure on / route: " + e);
res.render('meta/500.ejs');
}
}));
};
function isLoggedIn(req, res, next) {
if (req.isAuthenticated())
return next();
res.redirect('/login');
}
// Code originally from James Long
// http://jlongster.com/A-Study-on-Solving-Callbacks-with-JavaScript-Generators
function asyncCallback(gen) {
return function() {
return Q.async(gen).apply(null, arguments).done();
};
}
Any ideas about why this strange behavior may be occurring? I can't imagine why importing a library would affect the 'req' object, but somehow it does. Could this be a bug in Express?
EDIT:
Forgot the stack trace:
TypeError: Cannot read property 'user' of undefined
at Robinhood.getUser (/vagrant/StockFire/node_modules/marian/index.js:110:26)
at /vagrant/StockFire/app/routes.js:28:40
at next (native)
at Function.continuer (/vagrant/StockFire/node_modules/q/q.js:1278:45)
at /vagrant/StockFire/node_modules/q/q.js:1305:16
at /vagrant/StockFire/app/routes.js:226:29
at Layer.handle [as handle_request] (/vagrant/StockFire/node_modules/express/lib/router/layer.js:95:5)
at next (/vagrant/StockFire/node_modules/express/lib/router/route.js:131:13)
at isLoggedIn (/vagrant/StockFire/app/routes.js:217:16)
at Layer.handle [as handle_request] (/vagrant/StockFire/node_modules/express/lib/router/layer.js:95:5)
at next (/vagrant/StockFire/node_modules/express/lib/router/route.js:131:13)
at Route.dispatch (/vagrant/StockFire/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/vagrant/StockFire/node_modules/express/lib/router/layer.js:95:5)
at /vagrant/StockFire/node_modules/express/lib/router/index.js:277:22
at Function.process_params (/vagrant/StockFire/node_modules/express/lib/router/index.js:330:12)
at next (/vagrant/StockFire/node_modules/express/lib/router/index.js:271:10)

Solved the issue. Simple bug, but very hard to find. I discovered that a variable named endpoints existed in both libraries, but neither was declared with var, meaning that the variable was overwritten since they both existed in the javascript global scope. Lessons learned: Always check variable scope.