microservices-demo

<!-- <p align="center">
<img src="/src/frontend/static/icons/Hipster_HeroLogoMaroon.svg" width="300" alt="Online Boutique" />
</p> -->
![Continuous Integration](https://github.com/GoogleCloudPlatform/microservices-demo/workflows/Continuous%20Integration%20-%20Main/Release/badge.svg)

**Online Boutique** is a cloud-first microservices demo application.  The application is a
web-based e-commerce app where users can browse items, add them to the cart, and purchase them.

Google uses this application to demonstrate how developers can modernize enterprise applications using Google Cloud products, including: [Google Kubernetes Engine (GKE)](https://cloud.google.com/kubernetes-engine), [Cloud Service Mesh (CSM)](https://cloud.google.com/service-mesh), [gRPC](https://grpc.io/), [Cloud Operations](https://cloud.google.com/products/operations), [Spanner](https://cloud.google.com/spanner), [Memorystore](https://cloud.google.com/memorystore), [AlloyDB](https://cloud.google.com/alloydb), and [Gemini](https://ai.google.dev/). This application works on any Kubernetes cluster.

If you’re using this demo, please **★Star** this repository to show your interest!

**Note to Googlers:** Please fill out the form at [go/microservices-demo](http://go/microservices-demo).

## Architecture

**Online Boutique** is composed of 11 microservices written in different
languages that talk to each other over gRPC.

[![Architecture of
microservices](/docs/img/architecture-diagram.png)](/docs/img/architecture-diagram.png)

Find **Protocol Buffers Descriptions** at the [`./protos` directory](/protos).

| Service                                              | Language      | Description                                                                                                                       |
| ---------------------------------------------------- | ------------- | --------------------------------------------------------------------------------------------------------------------------------- |
| [frontend](/src/frontend)                           | Go            | Exposes an HTTP server to serve the website. Does not require signup/login and generates session IDs for all users automatically. |
| [cartservice](/src/cartservice)                     | C#            | Stores the items in the user's shopping cart in Redis and retrieves it.                                                           |
| [productcatalogservice](/src/productcatalogservice) | Go            | Provides the list of products from a JSON file and ability to search products and get individual products.                        |
| [currencyservice](/src/currencyservice)             | Node.js       | Converts one money amount to another currency. Uses real values fetched from European Central Bank. It's the highest QPS service. |
| [paymentservice](/src/paymentservice)               | Node.js       | Charges the given credit card info (mock) with the given amount and returns a transaction ID.