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CHATAPP

Real-time Chat Application
(This repository is for introduction. More complete commercial code is managed in a private repository)

Table of contents

● Technical Stack
● Service Overview
● Service Contents
● Upcoming Work

Technical Stack

  • Infra

    • AWS EC2
    • AWS S3
    • AWS CloudFront
    • Nginx
    • Mysql
      • Sequelize
    • Docker
    • kubernates

  • Backend

    • Node.js
    • Express
    • Token-based authentication
      • JWT
    • SocketIO

  • Frontend

    • React Native
    • Redux
      • Thunk
      • Saga
    • React Navigation

Architecture

architecture drawio

Service Overview

  • How this service works
    • How do you deploy to both devices Android & IOS ?
      • By using ReactNative, you can replace native mobile development with javascript
    • How do you plan to handle if there are many requests?
      • Basically, the server is developed in a direction that allows scale out
      • For scale out, event sharing and query caching are conducted using Redis
      • Finally, it will go up to the container via docker and the number of containers will be automatically adjusted through kubernetes
      • Static data such as images are stored in S3 storage and can be quickly received through cdn like cloudfront
  • Chat Rules
    • Authentication
      • JWT tokens are given through authentication. The token will be refreshed in the middle and remain in the device's asyncstorage for automatic login
      • Considering Scalability, I used the passport library for login. In the future, Facebook and KakaoTalk login will be supported separately from email login
    • Chating
      • Chatting takes place in real time, and message notifications are sent even when you are not in the Chat tab
    • About Recommendation System
      • We will calculate tastes and scores based on user-to-user evaluation
      • The evaluation will be conducted by at least 30 people, a standard that can approximate the normal distribution
      • Like Netflix, we will increase user satisfaction based on the recommendation algorithm

Service Contents

  • SignIn & SignUp Coming soon...
  • Initial Screen Coming soon...
  • Chat Coming soon...
  • ETC Coming soon...

Upcoming Work

  • SignIn and SignUp have been implemented
  • Nginx, EC2, S3, and CloudFront infrastructure setup is complete
  • Crop and upload the image is complete
  • Scale out base such as event sharing based on socket.io-redis were implemented
  • Basic chat function is available