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Ecommerce Microservices Expressjs

Building ecommerce services

Overview

This is a working draft of specification for Ecommerce system build by microservices. The system has been working round some underlying features during 7 days in rush, but overall I did epxress my idea about how to build ecommerce system with high traffic and easy to expand horizontally. As well as loose couple and high cohesion of interaction between services.

Getting Started

How to setup and config

Make sure you already installed Docker and Docker Compose on your machine. Navigate to microservices folder RUN docker-compose up -d At first time, it will take time to build containers and other involving.

After all services are up, we need to create databases.

Product Service

Database:

RUN docker-compose exec product-service sequelize-cli db:create --config config/database.json

Tables:

RUN docker-compose exec product-service sequelize-cli db:migrate --config config/database.json

Seeders:

RUN docker-compose exec product-service sequelize-cli db:seed:all --config config/database.json

Order Service

Database:

RUN docker-compose exec order-service sequelize-cli db:create --config config/database.json

Tables:

RUN docker-compose exec order-service sequelize-cli db:migrate --config config/database.json

NOTICE:

Port has been exposed:

  • Product Service: 8080

  • Order Service: 8081

  • RabbitMQ: 15672

We can also access to rabbit browser to see whether message has been queued by enter address http://localhost:15672/ with username and password are guest Great! We have finished some stuff, let's go and play around.

Let me know a product catalog and its products with id equal 1:

curl -X POST "http://localhost:8080/graphql" \
-H "Content-Type: application/json" \
-d '{"query": "{catalog(id:1){name,description,products{name}}}"}'

Or I need to create an order:

curl -X POST "http://localhost:8081/graphql" \
-H "Content-Type: application/json" \
-d '{"query": "mutation {createOrder(total:100, status: PENDING,customer_account_id:1,orderlines:[{price:45,quantity:1,discount:0,unit:\"kg\",subtotal:45, product_description_id:1}]){total,status,orderlines{price,discount,unit,quantity}}}"}'

Architecuture

1. Component Diagram

alt text

2. Sequence Diagram (Process Order)

alt text

3. ER (Product Catalog)

alt text

4. ER (Order Manager)

alt text

5. ER (Inventory)

alt text

Design pattern

  • Singleton
  • Proxy pattern

Technical stack

  • Node.js
  • Docker && Docker Compose
  • RabbitMQ
  • GraphQL
  • Mysql

Testing

  • Run docker-compose exec product-service npm test

Lib Included

  • express-graphql
  • graphql-scalars
  • mysql2
  • sequelize
  • mocha

Dockers

1. Observability

  • grafana
  • prometheus

2. Message Broker

  • rabbitmq

3. Database Management System

  • mysql

4. Services

  • Product Catalog
  • Order Manager

Contact

I'm a software engineer, please contact me via email: khoa.zamioza@gmail.com or Linkedin https://www.linkedin.com/in/khoa-nguyen-software-engineer feel free to ask me.