Lean 4 Game

This is a prototype for a Lean 4 game platform. It is based on ideas from the Lean Game Maker and the Natural Number Game (NNG) of Kevin Buzzard and Mohammad Pedramfar. The project is currently mostly copied from Patrick Massot's NNG4, but we plan to extend it significantly.

Building this requires a npm toolchain. After cloning the repository you should run npm install to pull in all dependencies. For development and experimentation, you can run npm start that will perform a non-optimized build and then run a local webserver on port 3000.

Progress

This is a work in progress. In the future there are plans to host a server managing different public learning games for Lean4, but for now the target is to provide the first games (in German and eventually English) by April 2023.

NPM Scripts

• npm start: Start the project in development mode. The browser will automatically reload when client files get changed. The Lean server will get recompiled and restarted when lean files get changed. The Lean server will be started without a container. The client and server can be started separately using the scripts npm run start_client and npm run start_server. The project can be accessed via http://localhost:3000. Internally, websocket requests to ws://localhost:3000/websockets will be forwarded to a Lean server running on port 8080.

• npm run build: Build the project in production mode. All assets of the client will be compiled into client/dist. On the server side, the command will set up a docker image containing the Lean server. The two parts can be built separately using npm run build_client and npm run build_server.

• npm run production: Start the project in production mode. This requires that the build script has been run. It will start a server on the port specified in the PORT environment variable or by default on 8080. You can run on a specifiv port by running PORT=80 npm run production. The server will serve the files in client/dist via http and give access to the docker-contained Lean server via the web socket protocol.

Security

Providing the use access to a Lean instance running on the server is a severe security risk. That is why we start the Lean server in a Docker container secured by gVisor.

Detailed installation notes

Node.js

Developed using node v19.3.0 (npm v9.2.0).

Install nvm

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.2/install.sh | bash

then reopen bash and test with command -v nvm if it is available (Should print "nvm").

Now install node:

nvm install node