Test chat app

Credentials: Viktor Kyliukh

⚠️ IMPORTANT️

Create you own .env file in root directory with ports and links (look up in .env.example)

Start the app with Docker desktop from root directory:

docker compose up --build

Or Docker Engine:

docker-compose up --build

Доєднуватися до localhost!!!!

About the solution:

App is containerized with Docker, and consists of 3 images:

• mongodb (for Database)
• server (Node.js part)
• ui-server (React part)

Backend:

As was asked in the requirements:

• Node.js
• Socket.io

I decided to use DB for storing data, my choice was MongoDB because that's easy for storing and retrieving data. So I needed an extra library mongoose and also I've added TypeScript to Node.js for better control on types and express for REST API.

All of my services are in /services folder, a bit about them:

I decided to separate the DB interactions into a singleton class DatabaseService() either with SessionService()

Also, bots and creating chats as new user appears made in way, that they could be easily utilized without breaking the main logic

Frontend

Queries are done using useQuery hook from react-query For post calls used axios, and for notifications about updates socket.io-client

About chats and bots

At each new session new bots are created (this was done intentionally, to show offline/online feature).

And each time new USERauthenticates, server creates new chats with EVERY user that was created before

Some realisations were intentionally left unoptimised due to the lack of time I could've improve chat list update (without refreshing all chats in the list)