78 lines
No EOL
2.4 KiB
JavaScript
78 lines
No EOL
2.4 KiB
JavaScript
/// <reference lib="webworker" />
|
|
|
|
import { build, files, version } from '$service-worker';
|
|
|
|
const worker = ServiceWorkerGlobalScope;
|
|
// const FILES = cache + version;
|
|
|
|
const to_cache = build.concat(files);
|
|
const staticAssets = new Set(to_cache);
|
|
|
|
worker.addEventListener('install', (event) => {
|
|
event.waitUntil(
|
|
caches
|
|
.open(FILES)
|
|
.then((cache) => cache.addAll(to_cache))
|
|
.then(() => {
|
|
worker.skipWaiting();
|
|
})
|
|
);
|
|
});
|
|
|
|
worker.addEventListener('activate', (event) => {
|
|
event.waitUntil(
|
|
caches.keys().then(async (keys) => {
|
|
// delete old caches
|
|
for (const key of keys) {
|
|
if (key !== FILES) await caches.delete(key);
|
|
}
|
|
|
|
worker.clients.claim();
|
|
})
|
|
);
|
|
});
|
|
|
|
/**
|
|
* Fetch the asset from the network and store it in the cache.
|
|
* Fall back to the cache if the user is offline.
|
|
*/
|
|
async function fetchAndCache(request) {
|
|
const cache = await caches.open(offline + version);
|
|
|
|
try {
|
|
const response = await fetch(request);
|
|
cache.put(request, response.clone());
|
|
return response;
|
|
} catch (err) {
|
|
const response = await cache.match(request);
|
|
if (response) return response;
|
|
|
|
throw err;
|
|
}
|
|
}
|
|
|
|
worker.addEventListener('fetch', (event) => {
|
|
if (event.request.method !== 'GET' || event.request.headers.has('range')) return;
|
|
|
|
const url = new URL(event.request.url);
|
|
|
|
// don't try to handle e.g. data: URIs
|
|
const isHttp = url.protocol.startsWith('http');
|
|
const isDevServerRequest =
|
|
url.hostname === self.location.hostname && url.port !== self.location.port;
|
|
const isStaticAsset = url.host === self.location.host && staticAssets.has(url.pathname);
|
|
const skipBecauseUncached = event.request.cache === 'only-if-cached' && !isStaticAsset;
|
|
|
|
if (isHttp && !isDevServerRequest && !skipBecauseUncached) {
|
|
event.respondWith(
|
|
(async () => {
|
|
// always serve static files and bundler-generated assets from cache.
|
|
// if your application has other URLs with data that will never change,
|
|
// set this variable to true for them and they will only be fetched once.
|
|
const cachedAsset = isStaticAsset && (await caches.match(event.request));
|
|
|
|
return cachedAsset || fetchAndCache(event.request);
|
|
})()
|
|
);
|
|
}
|
|
}); |