catarrh
30918e4f4a
Even with the rebuilt style.css, three caching paths could still serve the old file: - the server sent Cache-Control: no-cache only for index.html/sw.js, so browsers could heuristically cache style.css; - the SW install precached with addAll(), which re-uses HTTP-cached copies, so a new SW version could precache the stale file; - the fetch handler is cache-first (fine once the cache is fresh). Now every static shell file is served with Cache-Control: no-cache plus Last-Modified and cheap 304 revalidation, and the SW install fetches each precache URL with cache: 'reload' (CACHE simple-v304). A test pins the install behaviour. 661 frontend / 504 Python green; version 3.6.31. Note: the public demo simple.atroshin.ru is still v3.6.20 with the old stylesheet - it needs a deploy of the current frontend/.
78 lines
2.1 KiB
JavaScript
78 lines
2.1 KiB
JavaScript
const CACHE = 'simple-v304';
|
|
const URLS = [
|
|
'index.html',
|
|
'help.html',
|
|
'help-ru.html',
|
|
'style.css',
|
|
'sim.png',
|
|
'favicon.svg',
|
|
'icon-192.png',
|
|
'icon-512.png',
|
|
'manifest.json',
|
|
'des-bundle.js',
|
|
'aes-bundle.js',
|
|
'sim.svg',
|
|
'sim_anim.svg',
|
|
'nosim.svg',
|
|
'uicc_files.json',
|
|
];
|
|
|
|
self.addEventListener('install', e => {
|
|
// Fetch the shell with `cache: 'reload'`: a plain addAll() would re-use
|
|
// HTTP-cached copies, so a new SW version could precache a stale
|
|
// style.css/index.html (the stale-style trap, v3.6.31).
|
|
e.waitUntil(
|
|
caches.open(CACHE).then(c =>
|
|
Promise.all(URLS.map(u => fetch(u, { cache: 'reload' }).then(r => {
|
|
if (r && r.ok) return c.put(u, r);
|
|
})))
|
|
)
|
|
);
|
|
self.skipWaiting();
|
|
});
|
|
|
|
self.addEventListener('activate', e => {
|
|
e.waitUntil(
|
|
caches.keys().then(keys =>
|
|
Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k)))
|
|
).then(() => clients.claim())
|
|
);
|
|
});
|
|
|
|
const OFFLINE_RESPONSE = new Response('Offline: page not cached', {
|
|
status: 503,
|
|
statusText: 'Offline',
|
|
headers: { 'Content-Type': 'text/plain' },
|
|
});
|
|
|
|
self.addEventListener('fetch', e => {
|
|
if (!e.request.url.startsWith('http')) return;
|
|
const path = new URL(e.request.url).pathname;
|
|
if (path.startsWith('/api/')) return; // live data, never cache
|
|
if (e.request.method !== 'GET') return;
|
|
const isNavigate = e.request.mode === 'navigate';
|
|
const isSwScript = path.endsWith('/sw.js');
|
|
if (isNavigate) {
|
|
e.respondWith(
|
|
fetch(e.request).then(res => {
|
|
const clone = res.clone();
|
|
caches.open(CACHE).then(c => c.put(e.request, clone));
|
|
return res;
|
|
}).catch(() =>
|
|
caches.match(e.request)
|
|
.then(r => r || caches.match('index.html'))
|
|
.then(r => r || OFFLINE_RESPONSE)
|
|
)
|
|
);
|
|
} else if (isSwScript) {
|
|
e.respondWith(fetch(e.request).catch(() => OFFLINE_RESPONSE));
|
|
} else {
|
|
e.respondWith(
|
|
caches.match(e.request).then(r => r || fetch(e.request).then(res => {
|
|
const clone = res.clone();
|
|
caches.open(CACHE).then(c => c.put(e.request, clone));
|
|
return res;
|
|
}))
|
|
);
|
|
}
|
|
}); |