Pekko HTTP / Scala.js / Websocket Chat App

A simple chat app that uses a pekko-http backend and a scala.js frontend to implement a simple websocket based chat application.

To run:

sbt

> project backend
> re-start

Navigate to http://localhost:8080/.

You can build a fully self-contained jar using assembly in the backend project.

Configuration

You can set app.interface and app.port in application.conf to configure where the server should listen to.

This also works on the command line using JVM properties, e.g. using re-start:

> re-start --- -Dapp.interface=0.0.0.0 -Dapp.port=8080

will start the server listening on all interfaces.

CLI

The cli project contains a command line client for the chat to demonstrate the Websocket client and how to deal with console input in a streaming way.

It runs best directly from a terminal.

Start the server as explained above. Then, to build a fat jar use

sbt

> project cli
> assembly

Run

java -jar cli/target/scala-2.11/cli-assembly-0.1-SNAPSHOT.jar

or

./chat

Here's another screencast that shows live tab completion in action:

Known issues

The "frontend"

There isn't more than absolutely necessary there right now.