webmstk

How to scale out a Phoenix application with websocket

Foreword

It's relatively easy to scale out stateless web applications. You often only need a reverse proxy. But for those stateful web applications, especially those applications that embeds websocket services in them, it's always a pain to distribute them in a cluster. The traditional way is introducing some external services like Redis to handle pubsub, however, in such way, you often need to change your code. Can Erlang/Elixir, the "concurrency oriented programming languages", best other languages in this use case? Has Phoenix framework already integrated the solution of horizontally scaling websocket? I'll do an experiment to prove (or disprove) that.

Resources

VPN-сервисы

Существует огромное количество VPN-сервисов. Вот два популярных варианта:

https://nordvpn.com/ большие скидки при оплате за 2 и 3 года, возврат денег в течение 30 дней (если зайти на https://nordvpn.com/features/ и пролистать вниз, то появится попап со скидкой 77% — $99 за три года)
https://www.privateinternetaccess.com/ старый, добротный

Таблица сравнения кучи VPN-сервисов https://thatoneprivacysite.net/vpn-comparison-chart/

См. также:

	const http = require("http");
	const esbuild = require("esbuild");

	const serve = async (servedir, listen) => {
	// Start esbuild's local web server. Random port will be chosen by esbuild.
	const { host, port } = await esbuild.serve({ servedir }, {});

	// Create a second (proxy) server that will forward requests to esbuild.
	const proxy = http.createServer((req, res) => {
	// forwardRequest forwards an http request through to esbuid.

	import 'dart:io';

	Future<void> main() async {
	// 1.
	print('Что говорит собачка?');
	var value = await userInput();
	print('Введена строка $value');

	print('\nЧто говорит кошка?');
	userInput().then((value) => print('Введена строка $value'));

	// 1.
	class User {
	User(this.name, this.surname);

	String name;
	String surname;

	@override
	String toString() {
	return 'User(name: $name, surname: $surname)';

	import 'dart:math';

	void main() {
	// 1.
	String text = 'hello world';
	revert(text);

	// 2.
	var ar = [1, 22, 3, 40, 12];
	var result = avg(ar);

	import 'dart:io';

	void main() {
	// 1.
	int monthCount = 3;
	switch (monthCount) {
	case 1:
	print('Январь');
	break;
	case 2:

	// 1.
	int a = 13;

	// 2.
	double b = 12.8;

	// 3.
	var text = 'moon';

	// Error: A value of type 'String' can't be assigned to a variable of type 'int'.

	<?require $_SERVER['DOCUMENT_ROOT'] . '/bitrix/modules/main/include/prolog_before.php';?>

	<?
	\Bitrix\Main\Loader::includeModule('iblock');

	$arSelect = array(
	'ID',
	'NAME',
	'DETAIL_TEXT',
	'CREATED_DATE',