Dave
43db37e63b
Cache-first meant players kept loading the previous build until their second visit - a redeploy was invisible. The shell is now fetched from the network first and falls back to the cache when offline; the icons and manifest stay cache-first. Cache name bumped to v2 to drop old copies.
73 lines
2 KiB
JavaScript
73 lines
2 KiB
JavaScript
/* Mineflappy offline cache.
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The app shell (index.html) is fetched NETWORK-FIRST so a new deploy
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reaches the player immediately; if the network is down it falls back to
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the cached copy. The icons and manifest are cache-first because they
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only change with a version bump. */
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const CACHE = 'mineflappy-v2';
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const 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-32.png'
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];
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self.addEventListener('install', e => {
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e.waitUntil(
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caches.open(CACHE)
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.then(c => c.addAll(ASSETS))
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.then(() => self.skipWaiting())
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);
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});
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self.addEventListener('activate', e => {
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e.waitUntil(
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caches.keys()
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.then(keys => Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k))))
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.then(() => self.clients.claim())
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);
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});
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function isAppShell(url) {
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return url.pathname.endsWith('/') ||
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url.pathname.endsWith('/index.html') ||
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url.pathname.endsWith('/sw.js');
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}
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self.addEventListener('fetch', e => {
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const req = e.request;
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if (req.method !== 'GET') return;
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const url = new URL(req.url);
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if (url.origin !== location.origin) return;
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if (isAppShell(url)) {
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/* network first - a redeploy shows up straight away */
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e.respondWith(
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fetch(req).then(res => {
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if (res && res.status === 200) {
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const copy = res.clone();
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caches.open(CACHE).then(c => c.put(req, copy));
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}
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return res;
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}).catch(() => caches.match(req).then(hit => hit || caches.match('./index.html')))
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);
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return;
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}
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/* everything else: cache first, refresh in the background */
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e.respondWith(
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caches.match(req).then(hit => {
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const network = fetch(req).then(res => {
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if (res && res.status === 200 && res.type === 'basic') {
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const copy = res.clone();
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caches.open(CACHE).then(c => c.put(req, copy));
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}
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return res;
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}).catch(() => hit);
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return hit || network;
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})
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);
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});
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