Struct CanvasStore 

pub struct CanvasStore { /* private fields */ }

Thread-safe store for canvas state. Shared between the tool and gateway.

Implementations

impl CanvasStore

pub fn new() -> Self

Create a new empty canvas store.

pub async fn list(&self) -> Vec<CanvasSummary>

List all active canvases.

pub async fn snapshot(&self, id: &str) -> Option<Canvas>

Get current snapshot of a canvas.

pub async fn history(&self, id: &str) -> Option<VecDeque<CanvasFrame>>

Get frame history for a canvas.

pub async fn render( &self, id: &str, content_type: &str, content: &str, ) -> Result<()>

Render content to a canvas.

Creates the canvas if it does not exist. Pushes the previous current frame into history (capped at MAX_HISTORY_FRAMES) and broadcasts the update.

Returns an error if the content type is not in [ALLOWED_CONTENT_TYPES] or the content exceeds MAX_CONTENT_BYTES.

pub async fn clear(&self, id: &str) -> bool

Clear a canvas (remove current content, keep history).

Returns true if the canvas existed, false otherwise.

pub fn subscribe(&self) -> Receiver<(String, CanvasFrame)>

Subscribe to canvas updates (for WebSocket streaming).

Trait Implementations

impl Clone for CanvasStore

fn clone(&self) -> CanvasStore

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CanvasStore

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for CanvasStore

fn default() -> Self

Returns the “default value” for a type.