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59 lines
2.5 KiB
TypeScript
59 lines
2.5 KiB
TypeScript
/**
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* Waking up without stale state. After sleep, an unlock or a network change, the app
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* does what it does when a tab comes back into view: the JMAP client checks for state
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* changes and replaces a dead stream, the identities and policy refresh. Those are the
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* handlers already listening, so this only gives them the word. The hidden main window
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* of the desktop app never goes out of view, so without this they wouldn't hear it.
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* The local store hangs on the same two: `online` is setOnline(true) and a flush,
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* `visibilitychange` is a sync per account. It takes itself offline for a sleep through
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* addSleepHandler, in lib/desktop/system-events.ts.
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*/
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import { getDesktopBridge } from '@/lib/desktop/bridge';
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import { runSleepHandlers, runWakeHandlers } from '@/lib/desktop/system-events';
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import { usePolicyStore } from '@/stores/policy-store';
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/** A resume, an unlock and a network change come together, and each would mean a round of requests. */
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const WAKE_REPEAT_MS = 30_000;
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function wake(): void {
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document.dispatchEvent(new Event('visibilitychange'));
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// Woken up with no network: the browser's own event comes when there is one.
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if (navigator.onLine !== false) window.dispatchEvent(new Event('online'));
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const policy = usePolicyStore.getState();
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if (policy.loaded && !policy.fetching) void policy.fetchPolicy();
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runWakeHandlers();
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}
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export function startPowerWatch(): () => void {
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const bridge = getDesktopBridge()?.os;
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if (!bridge) return () => {};
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let lastWake = 0;
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const wakeOnce = () => {
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const now = Date.now();
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if (now - lastWake < WAKE_REPEAT_MS) return;
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lastWake = now;
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wake();
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};
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const stopPower = bridge.onPower((event) => {
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if (event === 'resume' || event === 'unlock-screen') wakeOnce();
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else if (event === 'suspend') runSleepHandlers();
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});
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// Wi-Fi to cable is a new network with no offline moment in between. This event also fires
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// for every shift in its speed estimate, which isn't news. Where Chromium doesn't report the
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// type, that leaves the stream's own ping check and the online event.
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const connection = (navigator as unknown as { connection?: EventTarget & { type?: string } }).connection;
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let lastType = connection?.type;
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const onConnection = () => {
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const type = connection?.type;
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if (!type || type === lastType) return;
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lastType = type;
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wakeOnce();
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};
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connection?.addEventListener?.('change', onConnection);
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return () => {
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stopPower();
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connection?.removeEventListener?.('change', onConnection);
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};
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}
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