K8S GraphQL/gRPC Microservices Template
This project is a cloud native microservices monorepo project based on Google Hipster Shop Demo. The project can serve as a startup template to utilize a modularized microservices technologies like Kubernetes/GKE, gRPC, GraphQL and Istio.
This project is managed in a monorepo based on Skaffold/Cloud Code for easy developing and deploying. This application works on any Kubernetes cluster (such as a local one), as well as Google Kubernetes Engine.
Service Architecture
The application is a web-based shop demo composed of many microservices written in different languages that talk to each other via gRPC.
Find Protocol Buffers Descriptions at the ./pb directory.
| Service | Language | Description |
|---|---|---|
| frontend | Go | Exposes an HTTP server to serve the website. Does not require signup/login and generates session IDs for all users automatically. |
| gateway | Node/Typescript | GraphQL gateway to backend microservices. |
| cartservice | C# | Stores the items in the user's shopping cart in Redis and retrieves it. |
| productcatalogservice | PHP | Provides the list of products from a JSON file and ability to search products and get individual products. |
| 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 | Node/JS | Charges the given credit card info (mock) with the given amount and returns a transaction ID. |
| shippingservice | Go | Gives shipping cost estimates based on the shopping cart. Ships items to the given address (mock) |
| emailservice | Python 3 | Sends users an order confirmation email (mock). |
| checkoutservice | Go | Retrieves user cart, prepares order and orchestrates the payment, shipping and the email notification. |
| recommendationservice | Python 2 | Recommends other products based on what's given in the cart. |
| adservice | Java | Provides text ads based on given context words. |
| loadgenerator | Python/Locust | Continuously sends requests imitating realistic user shopping flows to the frontend. |