Monolith WebSocket Pub/Sub

Use this skill when

• Building chat/live updates.
• Debugging channel subscriptions or message broadcast behavior.

Entry points

• Route: GET /ws in app/routes/routes.go
• Implementation: ws/ws.go
• Persistent message model: app/models/ws.go

Client protocol

Send JSON commands:

• Subscribe: {"command":"subscribe","identifier":"ChatChannel"}
• Publish: {"command":"message","identifier":"ChatChannel","data":"Hello"}

Server behavior

• Hub tracks channel subscriptions.
• message commands are persisted then broadcast to subscribed clients.
• Client loop handles register/unregister and ping/pong lifecycle.

Extension workflow

1. Pick channel naming strategy (room, user, domain event).
2. Add frontend websocket client logic in static/js/application.js or app-specific JS.
3. Optionally enforce auth checks before allowing subscribe/publish.
4. Add tests in ws/ws_test.go style for command handling.