Microservice solutions using Redis

Sample Ecommerce application built to demonstrate redis solutions to solve common problems in microservice architecture.

Following are the Microservice tutorials referring this application :

• Command and Query Responsibility Segregation

• Microservices Communication with Redis streams

• Query Caching

• API Gateway Caching

• Digital Identity Validation

• Transaction risk scoring

• GenAI Chatbot

Tech stack

• Front end : built using nextJs and Tailwind
• Backend : built using express (nodejs)
• Database : Prisma (MongoDB, Postgresql ..etc) , Redis

Manage application

Start application

# to start docker app
docker compose up -d

• Open "http://localhost:4200/" in browser

Note:

• Can view MongoDB data in MongoDB compass at URI mongodb://localhost:27017/dbFashion?directConnection=true

  • If postgresql, connection url is postgresql://prisma:prisma@localhost:5432/dbFashion?schema=public

• Can view Redis data in RedisInsight at localhost with port 6379

• Can change above connection details or ports by the environment variables in .env file

Other commands

# to stop docker app
docker compose down

# to stop & also delete volumes (mongodb & redis data)
docker compose down -v

# to rebuild all images & start
docker compose  up -d --build

# to rebuild image of specific service (after any code changes)
docker-compose build --no-cache <service_name>
# example
docker-compose build --no-cache orders-service

To change Database

1. Configure DATABASE_URL in root .env file

DATABASE_URL=mongodb://mongodb-server:27017/dbFashion
# OR
DATABASE_URL="postgresql://prisma:prisma@postgresql-server:5432/dbFashion?schema=public"

2. Run specific db schema generation

npm run mongodb-schema
# OR
npm run relational-schema

Note : above command copies database prisma schema file to various services (orders, payments..etc) and generate prisma types

3. Start docker

docker compose up -d --build

View database

-For MongoDB, download mongodb compass and connect with url mongodb://localhost:27017/dbFashion?directConnection=true

• For postgresql, connection url is postgresql://prisma:prisma@localhost:5432/dbFashion?schema=public

  • Current application contains pg admin GUI (docker) for postgres, if you want to use same then perform following

    1. open http://localhost:5200/ in browser & enter below details

    email: user@domain.com
    password: password

    2. Add new db server -> connection details

    hostname: host.docker.internal
    port: 5432
    username: prisma
    password: prisma

Repo formatting

Run prettier on all the files with the following:

npm i

npm run format

API docs

All API docs are available at /docs/api folder

Database Product list

Smaller dataset of products is used for the demo, but refer database docs to add larger dataset easily

Main folder structure

• cdn : Contains product images to be served to client (UI)
• client : frontend of the application
• database : To seed initial products data
• docs : API documentation
• server/ :
  • services : Some microservices of ecommerce app
  • api-gateway : Sample http proxy in-front of micro services
  • common : Shared files among microservices

Screenshots

Product

• Dashboard: Shows the list of products with search functionality

  

• Chat bot: The chat bot is available on the bottom right corner of the page. It can be used to search for products and view the product details.

  

  Clicking on a product in the chat shows the product details on dashboard

  

• Shopping Cart: Add products to the cart, then check out using the "Buy Now" button

• Order history: Once an order is placed, the Orders link in the top navigation bar shows the order status and history

  

• Admin: The admin link in the top navigation bar shows purchase stats and trending products.

  

• Settings: To control UI features

  

and so on

MongoDB

• products table

• orders table

• orderProducts table

• payments table

Postgressql

• products table

• orders table

• orderProducts table

• payments table

Redis

• order-with-products

• transaction-stream