Health Record API

A simple CRUD API with Redis caching, RabbitMQ Queuing, Message broadcasting using Websocket and Server Sent Events

Built with

• Node.js
• Express
• PostgreSQL
• Prisma
• Docker
• Redis
• RabbitMQ
• Websocket

Getting started

Prerequisites

• Node.js
• Docker

Installation

1. Clone the respository

   git clone https://github.com/RCOM363/health-record-api
   cd health-record-api

2. Environment variable setup

   Create an .env file in root directory & configure the following variables

    PORT=3000
   
    CORS_ORIGIN=*
   
    DATABASE_URL=<postgreSQL_DB_url>
   
    REDIS_URL="redis://redis:6379" // docker url
   
    RABBITMQ_URL="amqp://guest:guest@rabbitmq:5672" // docker url
   
    TOKEN_SECRET=<secret>

3. Setup Prisma Client

   npx prisma generate
   npx prisma migrate dev
   npx prisma db push

4. Run the server

   docker-compose up health-record-api

   NOTE: You will get connection error with RabbitMQ but it will connect after few tries

API Documentation

Login

• URL : /api/v1/auth/login
• Method : POST
• Body :

  {
    "email": "john@gmail.com",
    "password": "pass#123"
  }

• curl command :

  curl -X POST http://localhost:PORT/api/v1/auth/login \
  -H "Content-Type: application/json" \
  -d '{"email": "john@gmail.com","password": "pass#123"}'

Create a record

• URL : /api/v1/records
• Method : POST
• Body :

  {
    "name": "John Doe",
    "age": 25,
    "status": "Healthy"
  }

• curl command :

  curl -X POST http://localhost:PORT/api/v1/records \
  -H "Content-Type: application/json" \
  -d '{"name": "John Doe", "age": "25", "status": "Healthy"}'

Get a record

• URL : /api/v1/records/:id
• Method : GET
• curl command :

  curl http://localhost:PORT/api/v1/records/{id}

Update a record

• URL : /api/v1/records/:id
• Method : PUT
• Body :

  {
    "age": 20
  }

• curl command :

  curl -X POST http://localhost:PORT/api/v1/records/{id} \
  -H "Content-Type: application/json" \
  -d '{"age": "20"}'

Delete a record

• URL : /api/v1/records/:id
• Method : DELETE
• curl command :

  curl -X DELETE http://localhost:PORT/api/v1/records/{id}

Websocket server

Connect to the websocket server

• Endpoint : http://localhost:PORT/ws
• Use https://hoppscotch.io/realtime/websocket to test and add ws://localhost:PORT/ws as URL and hit connect

Server Sent Events

Connect to the SSE at

• Endpoint : http://localhost:PORT/sse/health-updates
• Use curl to test

    curl http://localhost:PORT/sse/health-updates

HTML Interface

An HTML file (public/test.html) is included to manually test all API endpoints and real-time functionalities using WebSockets and SSE.

Project structure & Architectural decisions

• Organized the code into separates modules (models, controllers, routes etc).
• Single server to handle API, Websocket and SSE.
• Created a separate Notification worker to consume the messages from the queue, keeping the processes decoupled.
• Used docker to isolate environments for Node.js server, Redis, RabbitMQ and Worker, each run in their own container.