Rhyolite

Rhyolite is neither recommended nor officially supported by Obsidian Systems, who is working on a new project called “Incremental View” that will supercede it; Incremental View will be much more appropriate for general use.

Rhyolite provides a bunch of functionality useful in complex SPAs. It is normally used with Obelisk. Use obelisk-rhyolite-template to bootstrap an Obelisk+Rhyolite project.

Real-time view

When using rhyolite your frontend can “listen” on some time-varying data stored in postgres on the backend. Rhyolite uses websocket for the communication between frontend and backend, as well as PostgreSQL NOTIFY/LISTEN for communicating updates from the database.

Your app will define a ViewSelector that the frontend will use to define what kind of data it needs to render its view. The rhyolite backend will in response push the resultant View down the websocket which gets reflected in a Dynamic in the frontend.