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[eric] canvas: ten minutes hidden parks every idle webview, an all-day OpenSwarm stops holding gigabytes it isn't showing

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ciregenz
2026-08-04 09:46:48 -07:00
parent 7664376397
commit 654aad67aa
1 changed files with 23 additions and 3 deletions
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frontend/src/app/pages/Dashboard/hooks/interaction/useWebviewSuspend.ts
+23 -3
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@@ -23,6 +23,10 @@ const SNAPSHOT_MAX_W = 1024;
const RESUME_MIN_CARD_PX = 220;
// Hard ceiling on simultaneous live webviews; past it the farthest-from-center non-agent card gets parked, so heavy pages degrade gracefully instead of OOMing.
const MAX_LIVE_WEBVIEWS = 8;
// App hidden this long = the user left; park every idle renderer (working agents keep theirs) so an
// all-day-open OpenSwarm stops holding gigabytes it isn't showing. Arc's tab-archiving tradeoff:
// coming back after a long absence pays a page reload, coming back quickly pays nothing.
const APP_HIDDEN_SUSPEND_MS = 10 * 60 * 1000;
interface Viewport {
panX: number;
@@ -128,6 +132,20 @@ export function useWebviewSuspend(
const prevMinimizedRef = useRef<Record<string, boolean>>({});
const vpRef = useRef<Viewport>({ panX, panY, zoom, vpW: 1200, vpH: 800 });
const [appHidden, setAppHidden] = useState(false);
useEffect(() => {
if (!isElectron) return;
let t: ReturnType<typeof setTimeout> | null = null;
const onVis = (): void => {
if (t) { clearTimeout(t); t = null; }
if (document.hidden) t = setTimeout(() => setAppHidden(true), APP_HIDDEN_SUSPEND_MS);
else setAppHidden(false);
};
document.addEventListener('visibilitychange', onVis);
onVis();
return () => { document.removeEventListener('visibilitychange', onVis); if (t) clearTimeout(t); };
}, []);
// Window resize changes the viewport without touching pan/zoom/cards; tick so the evaluation below reruns, or a shrunken window never suspends anything.
const [resizeTick, setResizeTick] = useState(0);
useEffect(() => {
@@ -168,7 +186,8 @@ export function useWebviewSuspend(
budget--;
continue;
}
if (budget <= 0 || minimized[id]) continue;
// While the app is hidden nothing idle resumes; the same loop wakes in-view cards on return.
if (appHidden || budget <= 0 || minimized[id]) continue;
// Un-minimizing is an explicit "give it back", so it wakes the card wherever the camera happens to be pointing.
if (wasMinimized[id]) {
restoredAt.set(id, Date.now());
@@ -187,7 +206,8 @@ export function useWebviewSuspend(
const isSuspended = (id: string) => !!store.getState().dashboardLayout.suspendedBrowserCards[id];
// Read live, not off the effect's closure: this re-runs after an await, and the user can restore a card mid-capture.
const wantsPark = (id: string, card: BrowserCardPosition): boolean =>
isMinimized(id)
appHidden
|| isMinimized(id)
|| (!withinRestoreGrace(id) && !cardIntersectsViewport(card, vpRef.current, SUSPEND_MARGIN_PX));
await refreshVisibleFrames(browserCards, isSuspended, vpRef.current);
for (const [id, card] of Object.entries(browserCards)) {
@@ -216,7 +236,7 @@ export function useWebviewSuspend(
}, SETTLE_MS);
return () => clearTimeout(timer);
}, [browserCards, suspended, minimized, panX, panY, zoom, viewportRef, dispatch, resizeTick]);
}, [browserCards, suspended, minimized, panX, panY, zoom, viewportRef, dispatch, resizeTick, appHidden]);
}
function distFromCenter(card: BrowserCardPosition, vp: Viewport): number {