46 lines
2.0 KiB
JavaScript
46 lines
2.0 KiB
JavaScript
// Network-only recovery entry: older workers do not intercept this page.
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const button = document.querySelector('#update');
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const status = document.querySelector('#status');
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function waitForState(worker, states) {
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return new Promise((resolve, reject) => {
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const finish = error => {
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clearTimeout(timer);
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worker.removeEventListener('statechange', check);
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error ? reject(error) : resolve();
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};
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const check = () => {
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if (states.includes(worker.state)) finish();
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else if (worker.state === 'redundant') finish(new Error('download'));
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};
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const timer = setTimeout(() => finish(new Error('timeout')), 120000);
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worker.addEventListener('statechange', check);
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check();
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});
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}
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button.addEventListener('click', async () => {
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button.disabled = true;
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status.textContent = '正在检查并下载完整资源，请保持联网…';
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try {
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if (!window.isSecureContext || !('serviceWorker' in navigator)) throw new Error('unsupported');
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const base = new URL('./', location.href);
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const registration = await navigator.serviceWorker.register(new URL('sw.js', base), {scope: base.href, updateViaCache: 'none'});
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// Await the network check even if a previous waiting version already exists.
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await registration.update();
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const installing = registration.installing;
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if (installing) await waitForState(installing, ['installed', 'activating', 'activated']);
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const worker = registration.waiting || registration.active;
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if (!worker) throw new Error('download');
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if (registration.waiting) {
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status.textContent = '资源已就绪，正在应用更新…';
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worker.postMessage({type: 'RHINE_APPLY_UPDATE'});
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}
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await waitForState(worker, ['activated']);
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// Claiming clients is part of the worker's activation; navigate afterwards.
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location.replace(base.href);
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} catch {
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status.textContent = '更新未完成，已保留原有数据。请确认网络可用后重试。';
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button.textContent = '重试更新 ↻';
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button.disabled = false;
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}
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});
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