Alex Hladun alex-hladun

🏠

Working from home

Full-stack dev with a background in Oil and Gas. I love all things technology, software dev, and problem solving! (also golf)

alex-hladun / IndexedDb.ts

Last active January 23, 2024 19:46

alex-hladun / SessionStore.ts

Created October 7, 2021 02:55

Querying the online user list

	getOnlineUsers = async () => {
	const keys = new Set();
	let cursor = "0";
	do {
	await new Promise((resolve, reject) =>
	this.redisClient.scan(
	cursor,
	"MATCH",
	"session:*",
	"COUNT",

alex-hladun / SessionStore.ts

Last active November 1, 2021 23:27

Saving & retrieving sessions in Redis


	// Save a session for a user and their online status
	saveSession(id: string, { username, connected }: { [key: string]: string }) {
	this.redisClient
	.multi()
	.hmset(`session:${id}`, "username", username, "connected", connected)
	.expire(`session:${id}`, SESSION_TTL)
	.exec();
	}

alex-hladun / SocketManager.ts

Created October 7, 2021 02:45

Connecting to socket.io-redis-adapter

	connectToHostedRedis = (redisEndpoint: string) => {
	this.pubClient = new RedisClient({ host: redisEndpoint, port: 6379 });
	const subClient = this.pubClient.duplicate();
	this.io.adapter(createAdapter({ pubClient: this.pubClient, subClient }));
	this.sessionStore = new RedisSessionStore(this.pubClient);
	};

alex-hladun / Routes.ts

Created September 30, 2021 18:52

Route for authentication on login

	import { Request, Response } from "express";
	import { createUser } from "./DynamoPuts";
	import { verifyLogin } from "./DynamoQueries";

	const registerRoutes = (dynamoEnabled: boolean) => {
	const express = require("express");
	const router = express.Router();

	router.post("/login", async (req: Request, res: Response) => {
	if (dynamoEnabled) {

alex-hladun / SocketManager.ts

Last active November 1, 2021 23:22

Auth middleware for socket

	class SocketManager {
	io: SocketIO.Server;
	pubClient: redis.RedisClient;
	sessionStore: RedisSessionStore;
	serverConfig: IServerConfig;
	redisEnabled: boolean;
	dynamoEnabled: boolean;

	constructor(server: http.Server, config: IServerConfig) {
	this.configureMiddleware();

alex-hladun / SocketManager.ts

Last active October 7, 2021 02:42

Setting up cors on the back-end

	// On the back-end
	this.io = new Server(server, {
	cors: {
	// Would change origin to eventual DNS for React app
	origin: "http://localhost:3000",
	methods: ["GET", "POST"],
	credentials: true
	},
	allowEIO3: true, // Whether to enable compatibility with Socket.IO v2 clients.
	maxHttpBufferSize: 1024, // max message payload size (prevents clients from sending gigabytes of data)

alex-hladun / SocketManager.ts

Last active November 1, 2021 23:12

Setting up the socket listeners

	import { joinRoom, saveRoomMessage } from "./DynamoPuts";

	class SocketManager {
	io: SocketIO.Server;
	dynamoEnabled: boolean;
	redisEnabled: boolean;
	dynamoEnabled: boolean;

	constructor(server: http.Server, config: IServerConfig) {
	this.generateSocketServer(server);

alex-hladun / SocketManager.ts

Last active November 1, 2021 23:10

Connecting Socket.io to our server

	import { Server, Socket } from "socket.io";

	Class SocketManager {
	io: SocketIO.Server;
	pubClient: redis.RedisClient;
	sessionStore: RedisSessionStore;
	serverConfig: IServerConfig;
	redisEnabled: boolean;
	dynamoEnabled: boolean;

alex-hladun / App.ts

Created September 30, 2021 17:50

Express server setup

	import { createServer } from "http";
	import express from "express";
	import cors from "cors";

	const app = express();
	app.use(
	cors({
	origin: "http://localhost:3000",
	methods: ["GET", "POST"],
	credentials: true