CHATAPP

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

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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

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