WhatsApp Clone Backend - Go Microservices Architecture

A microservices-based backend for a chat application built with Go.

Architecture

This project uses a microservices architecture with:

• API Gateway: Routes HTTP and WebSocket requests to appropriate microservices
• User Service: Handles user registration, authentication, and user management
• Message Service: Handles message exchange and storage
• RabbitMQ: Used for asynchronous communication between services
• MongoDB: Used for data storage

Running the Application

Prerequisites

• Docker and Docker Compose
• Go 1.21 or higher (for local development)

Using Docker Compose

docker-compose up -d

This will start all the necessary services:

• MongoDB on port 27017
• RabbitMQ on ports 5672 (AMQP) and 15672 (Management UI)
• API Gateway on port 8080
• User Service on port 8081
• Message Service on port 8082

API Endpoints

Public Endpoints

• POST /api/register: Register a new user
• POST /api/login: Login and receive a JWT token

Protected Endpoints (Require JWT Authentication)

• GET /api/users: Search for users
• GET /api/users/:id: Get user details
• GET /api/ws: WebSocket endpoint for real-time messaging
• GET /api/messages/:UserID: Get message history with another user
• POST /api/messages: Send a message via REST API

Authentication

The application uses JWT tokens for authentication. After logging in, include the token in subsequent requests as follows:

Authorization: Bearer <your-token>

WebSocket Communication

After authenticating, connect to the WebSocket endpoint at /api/ws with the JWT token in the request header. WebSocket messages should be JSON objects with the following format:

{
  "receiver_id": "user-id-to-send-message-to",
  "content": "Message content"
}