Distributed “Lupus in Fabula”

Distributed Lupus in Fabula is a real-time multiplayer web application that brings the classic social deduction game Lupus in Fabula online, allowing groups of players to create or join a game lobby from any browser and play a full match together over the internet. The system is composed of a Vue 3 single-page frontend and a FastAPI/Socket.IO backend, communicating via REST for stateless operations and via WebSocket for real-time, low-latency interactions such as votes, phase transitions, and private role actions. Game and lobby state is kept in Redis rather than a traditional database, acting both as a shared source of truth across backend replicas and as a Pub/Sub broker that lets events generated on one instance reach clients connected to any other instance. This design allows the backend to run as multiple concurrent, interchangeable replicas behind a reverse proxy, supporting many simultaneous matches while keeping every player’s view of the game synchronized in real time.