ecommerce
The ecommerce app simulates an ecommerce website.
Services
Unless otherwise noted, these services are implementations of the
python-flask template service.
api-gateway
The api-gateway service is a proxy. Most services in the ecommerce app
communicate with each other through the api-gateway service. This simplifies
the microservices topology by requiring the services to be aware of only on
service (in most cases). It also creates a predictable flow of communications
among services, and in theory, a single place to manage access among services.
There are exceptions in which communications don't flow through the api-gateway
service:
- The
web-gatewayserver communicates directly with thesession-dataservice in addition to theapi-gatewayservice. - The
web-gatewayclient communicates directly with theweb-gatewayserver. - The
contentservice communicates with a public-internet GCP storage bucket to fetch images. - The
syntheticsservice communicates directly with theweb-gatewayclient.
cart-data
The cart-data service stores the products and quantities of carts for each
session. The service is a redis server configured with a
replica service (cart-data-replica) for high availability.
cart
The cart service creates, reads, updates, and deletes carts and products in
the cart-data service via the api-gateway service.
checkout
The checkout service processes payments and, if successful, clears the cart.
It communicates with the payment and cart services via the api-gateway
service.
content
The content service fetches product images from a public-internet GCP bucket
that hosts images for the ecommerce microbs app.
payment
The payment service simulates the processing of a payment. Currently it does
this by waiting for a random period of time before returning an acknowledgement.
product-data
The product-data service is a product catalog that stores data about each
product. The service is a PostgreSQL database.
product
The product service queries product data from the product-data service.
session-data
The session-data service stores session cookie identifiers that the
web-gateway service uses to establish and persist session state. The service
is a redis server configured with a replica service
(session-data-replica) for high availability.
synthetics
The synthetics service generates traffic to the web-gateway client.
Currently all traffic simulates the process of adding a product to a cart and
then placing an order. The service uses k6 to simulate virtual
user traffic.
web-gateway
The web-gateway service is a web server that serves a React application and
brokers requests between the React application and the api-gateway service.
The synthetics service interacts directly with the React application.
The web-gateway is given an external service on port 80 on Kubernetes so
that human users can interact with the application.