AFZidan/interviews-challenges

Challenges for interviews

Interview Challenges

Simple e-commerce task

Functionality:

• User can login & register.
• User can add products in the cart.
• User can get his cart summary.
• docker-compose support

Backend:

• Elasticsearch as a database.
• NATs messaging system for services transportation.
• Redis for caching

Api Collection

- POST /api/register body:{name,email,password}
- POST /api/login body:{email,password}
- POST /api/products/create body:{ 
                                  name: {type: "string"},
                                  url: {type: "string"},
                                  sku: {type: "string"},
                                  barcode: {type: "string"},
                                  brand: {type: "string"},
                                  category: {type: "string"}
                                  } 
                              headers:{Authorization:<useer_token>}
                              
- POST /api/cart/add body:{productId} headers:{Authorization:<useer_token>}
- GET /api/cart headers:{Authorization:<useer_token>}
- POST /api/cart/clear headers:{Authorization:<useer_token>}

Build Setup

# Install dependencies
npm install

# Start developing with REPL
npm run dev

# Start production
npm start

# Run unit tests
npm test

# Run ESLint
npm run lint

# Run Prettier
npm run prettier

Run in Docker (production)

Set environment

Run in Docker (Development)

1. Start with docker-compose: node dc:up OR docker-compose up -d

   It starts all services in separated containers, a Redis server for caching and a Traefik reverse proxy. All nodes communicate via NATs transporter.

2. Open the http://docker-ip:3000

Code Overview

Dependencies

• moleculer - Microservices framework for NodeJS
• moleculer-web - Official API Gateway service for Moleculer
• nats - NATS transport driver for Moleculer (optional)
• elasticsearch - ELASTICSEARCH as database
• ioredis - REDIS caching
• jsonwebtoken - JWT user autheentication

Application Structure

• moleculer.config.js - Moleculer ServiceBroker configuration file.
• services/ - This folder contains the services.

Test

$ npm test