Chatrooms is a simple Chat-Server written in Scala. It allows clients to communicate with each other in different rooms. The protocol is very simple, clients send commands to the server via Websockets and the server sends ServerMessages back to the clients. I wrote this application in order to improve my Scala and ZIO knowledge.
The project can be compiled and tested with sbt or bloop. Make sure to export the build for bloop with sbt bloopInstall initially. The Makefile contains common build commands. You can compile the application with make compile and run the web server with make run-server. A simple client can be started with make make run-client. The Client can only be run with sbt, because bloop has problems with reading input from stdin.
This project has unit and e2e tests. The unit tests can be run with make test-unit and the e2e tests with make test-e2e. The e2e tests use a custom client to send and receive messages.
The application follows the ports and adapters (hexagonal) architecture pattern. The input or driving ports can be found in src/main/scala/chatrooms/usecases. These are the entry points into the business logic of the application. Driven Ports like MessageService are part of the domain layer in src/main/scala/chatrooms/domain. Implementations of driven ports can be found in main/scala/chatrooms/socketapp.