How to connect socket.io with a Heroku-deployed React Native app? - reactjs

Question

I have almost googled my fingers off trying to figure this out. It seems a lot of the existing info on connecting socket.io with React Native is outdated, or maybe I'm just interpreting things wrong?
I've managed to get the client-side connected (I'm getting the client console logs when I connect to my app). It seems to be the server-side that's giving me issues. Why is the data being emitted from the client not showing up as a log in my terminal? None of the related console.logs in my server.js are logging but the App.js console.logs are registering.
Edit: Here is my full App.js file:
import Expo from 'expo';
import React from 'react';
import { Dimensions, StyleSheet, Text, View } from 'react-native';
import store from './src/store';
import { Provider } from 'react-redux';
// window.navigator.useragent = 'react-native'; -> not necessary anymore?
const ROOT_URL = 'https://myherokudomain.herokuapp.com';
const io = require('socket.io-client/dist/socket.io');
const socket = io.connect(ROOT_URL);
socket.on('connect', () => {
console.log('Connected to server');
});
socket.on('example', (data) => {
console.log(data);
socket.emit('my other event', { my: 'data' });
});
socket.on('disconnect', () => {
console.log('Disconnected from server');
});
export default class App extends React.Component {
render() {
// const MainNavigator = my react-navigation system
return (
<Provider store={store}>
<View style={styles.container}>
<MainNavigator />
</View>
</Provider>
);
}
}
Edit: Here is my full server.js file:
const config = require('./config/config');
const { mongoose } = require('./db/mongoose');
const express = require('express');
const cors = require('cors');
const app = express();
const port = process.env.PORT;
// ************ Include and use separate routes file
app.use(require('./routes/routes'));
// ************
//Cross-Origin resource sharing. cors library solves CORS problems.
app.use(cors());
//***********
/* Chat server code*/
// enabled heroku session affinity:
// see https://devcenter.heroku.com/articles/session-affinity
// to enable: heroku features:enable http-session-affinity
// to diable: heroku features:disable http-session-affinity
const socketIO = require('socket.io');
const http = require('http');
const server = http.createServer(app);
const io = socketIO(server, { origin: "*:*" });
//********** */
io.on('connection', (socket) => {
console.log('A client just joined', socket.id);
socket.emit('example', { hello: 'world' });
socket.on('my other event', (data) => {
console.log(data);
});
socket.on('disconnect', () => {
console.log('User was disconnected');
});
});
server.listen(port, (err) => {
console.log(`started on port ${port}`);
});
module.exports = { app };
I am getting the console logs on the client side just fine (for instance, the "connected to server" and "hello: world" stuff is showing up when I open my app on expo. But I am not getting the server-side console logs.
What am I doing wrong - how do I get socket.io fully working with a deployed React-Native app?
I would really appreciate any help at all! I've been stuck on this forever.

Answer 1

I'm assuming all the code works, just not the logging since that's all you're asking about. The problem is Node doesn't output to your browser's console.
If it's deployed on heroku then you should see everything being logged there, otherwise you can use libraries like https://github.com/node-inspector/node-inspector to output to your browser.

Answer 2

You're not getting the server-side console logs because 1.) They're only logging on the server, and 2.) You're not emitting them, if you do actually want to send the data back.