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improved serviceworker caching

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Danny Coates 2018-11-26 13:25:47 -08:00
parent bf2399ab88
commit 613a70f473
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GPG key ID: 4C442633C62E00CB
1 changed files with 20 additions and 8 deletions
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28
app/serviceWorker.js
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@ -8,6 +8,9 @@ import contentDisposition from 'content-disposition';
let noSave = false;
const map = new Map();
const IMAGES = /.*\.(png|svg|jpg)$/;
const VERSIONED_ASSET = /\.[A-Fa-f0-9]{8}\.(js|css|png|svg|jpg)$/;
const DOWNLOAD_URL = /\/api\/download\/([A-Fa-f0-9]{4,})/;
self.addEventListener('install', event => {
event.waitUntil(precache());
@ -87,24 +90,33 @@ async function precache() {
}
}
const cache = await caches.open(version);
const images = assets.match(/.*\.(png|svg|jpg)$/);
const images = assets.match(IMAGES);
await cache.addAll(images);
return self.skipWaiting();
}
async function cachedOrFetch(req) {
async function cachedOrFetched(req) {
const cache = await caches.open(version);
const cached = await cache.match(req);
return cached || fetch(req);
if (cached) {
return cached;
}
const fetched = await fetch(req);
if (fetched.ok && VERSIONED_ASSET.test(req.url)) {
cache.put(req, fetched.clone());
}
return fetched;
}
self.onfetch = event => {
const req = event.request;
const match = /\/api\/download\/([A-Fa-f0-9]{4,})/.exec(req.url);
if (match) {
event.respondWith(decryptStream(match[1]));
} else {
event.respondWith(cachedOrFetch(req));
if (req.method !== 'GET') return;
const url = new URL(req.url);
const dlmatch = DOWNLOAD_URL.exec(url.pathname); // TODO use #hashkey
if (dlmatch) {
event.respondWith(decryptStream(dlmatch[1]));
} else if (VERSIONED_ASSET.test(url.pathname)) {
event.respondWith(cachedOrFetched(req));
}
};