• There are to microservices,

  • cart_server : REST Api that adds items to the cart and emits one event in Kafka
  • cart_consumer : Kafka consumer listening to those events

• This project is an implementation of a Cart for an e-commerce and has 2 endpoints:

  • One to add items
  • One to retrieve the cart status

• The project has been implemented with DDD and Hexagonal Arquitecture, isolating domain, application and infrastructure

• In storage there is an inMemoryRepository for the two entities that could be easily modified to a Real DB

• The libraries used that are not from the standard library are:

  • Gorilla Mux
  • Wire as the dependency injector
  • OpenCensus
  • Viper
  • Sarama

• The application is Dockerized

• The Server is launched in the port :8888

• Metrics and Traces with OpenCensus

• Metrics are exported to Prometheus and can be seen in http://localhost:9090

• Traces are exported to Jaeger and can be seen in http://localhost:16686

make up

make down

make build

• Only 3 kinds of items can be added to the cart:
  • "book"
  • "dvd"
  • "casette"

curl -i \
-H "Accept: application/json" \
-H "Content-Type:application/json" \
-X POST --data '{"item_id":"book","quantity":4}' http://localhost:8888/

curl -i -X GET http://localhost:8888/

There are unit tests and acceptance, in future iterations also integration should be added. To launch the tests:

make test