Architecture

Prest is a Rust workspace with a Dioxus WASM frontend and host-specific DAW integrations.

Workspace boundaries

Area	Responsibility
domain	Songs, setlists, transport state, and core models
application	Host-agnostic operations, transport contracts, invalidation, and notifications
protocol	Protobuf envelopes and codecs
frontend	Static Dioxus browser application for Editor, Performance, and Setup
server	Axum/Tokio HTTP and WebSocket runtime plus embedded assets
discovery	Canonical local identity and mDNS claims
daws/reaper	Native plugin, REAPER API loader, and main-thread dispatch
daws/ableton	Rust bridge and Python Remote Script

Runtime data flow

1. The browser loads static WASM application assets from the local runtime.
2. It opens a binary WebSocket to /ws.
3. Client and server exchange protobuf envelopes.
4. The server dispatches host operations through the active DAW boundary.
5. Invalidation and state messages keep browser views aligned with host state.

REAPER embeds the runtime directly in its plugin. Ableton’s Remote Script launches the separate bridge runtime.

Security boundary

The runtime binds to local interfaces and has no authentication. Development changes must preserve prominent private-network guidance and must not imply that local-only operation is itself a security guarantee.