Chat

A real-time chat application built with Phoenix 1.8 + LiveView. No database — all state lives in GenServer processes.

Features

• Session-based authentication (login/logout)
• Lobby with room list and room creation
• Public chat rooms (multiple users)
• Private 1:1 chats between users

Architecture

• Lobby — room discovery via Registry; broadcasts new rooms to connected clients
• Rooms — one GenServer per room under a DynamicSupervisor; tracks subscribers and message history
• Private chats — reuse the same Rooms.Server, keyed by sorted usernames (e.g. "alice:bob")
• Dead subscribers are cleaned up via Process.monitor/1

Getting started

# Install deps and build assets
mix setup

# Start the dev server (http://localhost:4000)
mix phx.server

Running tests

mix test

# Run previously failed tests
mix test --failed

Development

# Format, compile, and test
mix precommit