This is a small suite of Node applications, meant to be deployed as independent services within an event-driven architecture (EDA). The use case behind this architecture is the implementation of the backend of a simple online shop.
In order to bring the system up, ensure you have Docker installed, as well as its Compose feature. Then, inside the root directory of the project, run the following command in your terminal:
docker compose up
This should create containers for all services within the app. In order to test the latter, go to the following URL in your browser:
http://localhost:8080
This will load an online shop prototype. In this shop, you can select which product you would like to order from a dropdown menu. After clicking on 'Buy', your order is dispatched to the system. The resulting cascade of events is then displayed in the 'Notifications' section of the shop.
In this system, every individual microservice (or app) has a unique domain of responsibilities. Services communicate with each other via the emission of events to a broker. Here is a list of short descriptions for said services:
- Broker: This service takes care of relaying events in-between service.
- Order: This service takes care of order creation/deletion.
- Payment: This service takes care of order payments.
- Delivery: This services takes care of order shipments.
Below is a diagram of the architecture of this app. For now, the broker is responsible of the communication with the browser. There is no frontend, per se, that's part of this prototype.
Below is a diagram of the event flow implemented in this app. Each square represents the emission of an event. Each diamond represents a process, which takes place in one of the aforementioned services.
- Deploy a containerized set of microservices, which communicate together using an EDA.
- Use Docker Compose for container orchestration.
- Gracefully handle server shutdowns.
- Introduce a simple client app, which allows to trigger the flow of events associated with the ordering of a product.
- Use web sockets to send event notifications to the client app.
- Introduce container orchestration using Kubernetes.
- Introduce monitoring of container metrics using cAdvisor, Prometheus and Grafana.
- Introduce deployment using Docker Compose as part of a common external network.
- Rework the frontend for a better UX.
- Rename application from 'EDA-Playground' to 'SweetGiggles': the dummy shop is going to be a an online candy store.
- Introduce horizontal pod scaling in the K8s cluster and stress test it.