86 lines
2.5 KiB
JavaScript
86 lines
2.5 KiB
JavaScript
const CACHE_NAME = 'grabengasse-v1.0';
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const STATIC_ASSETS = [
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'/',
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'/index.html',
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'/manifest.webmanifest',
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'/icon-192.png',
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'/icon-512.png',
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'/apple-touch-icon.png',
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'/favicon.png'
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];
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// Install: Cache essential shell assets
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self.addEventListener('install', (event) => {
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event.waitUntil(
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caches.open(CACHE_NAME).then((cache) => {
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return cache.addAll(STATIC_ASSETS);
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}).then(() => self.skipWaiting())
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);
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});
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// Activate: Clean up previous cache versions
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self.addEventListener('activate', (event) => {
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event.waitUntil(
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caches.keys().then((keys) => {
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return Promise.all(
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keys.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key))
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);
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}).then(() => self.clients.claim())
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);
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});
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// Fetch: Network-first for API data, Stale-while-revalidate for static assets
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self.addEventListener('fetch', (event) => {
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const { request } = event;
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const url = new URL(request.url);
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// API calls: Network first with no fallback caching of stale live metrics
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if (url.pathname.startsWith('/api/')) {
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event.respondWith(
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fetch(request).catch(() => {
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return new Response(JSON.stringify({ error: 'Offline / Telemetry Link Offline' }), {
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status: 503,
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headers: { 'Content-Type': 'application/json' }
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});
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})
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);
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return;
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}
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// Navigation requests: Network first, fallback to cached /index.html (SPA routing)
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if (request.mode === 'navigate') {
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event.respondWith(
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fetch(request).catch(() => {
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return caches.match('/index.html');
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})
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);
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return;
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}
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// Static assets (CSS, JS, Fonts, Images): Cache-first with network fallback & cache update
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event.respondWith(
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caches.match(request).then((cachedResponse) => {
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if (cachedResponse) {
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// Fetch in background to update cache
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fetch(request).then((networkResponse) => {
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if (networkResponse && networkResponse.status === 200) {
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caches.open(CACHE_NAME).then((cache) => cache.put(request, networkResponse));
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}
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}).catch(() => {});
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return cachedResponse;
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}
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return fetch(request).then((networkResponse) => {
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if (!networkResponse || networkResponse.status !== 200 || networkResponse.type !== 'basic') {
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return networkResponse;
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}
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const responseToCache = networkResponse.clone();
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caches.open(CACHE_NAME).then((cache) => {
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cache.put(request, responseToCache);
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});
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return networkResponse;
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});
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})
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);
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});
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