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86 lines
2.6 KiB
86 lines
2.6 KiB
import { timestamp, files, shell } from '@sapper/service-worker'; |
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const ASSETS = `cache${timestamp}`; |
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// `shell` is an array of all the files generated by the bundler, |
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// `files` is an array of everything in the `static` directory |
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const to_cache = shell.concat(files); |
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const staticAssets = new Set(to_cache); |
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self.addEventListener('install', event => { |
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event.waitUntil( |
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caches |
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.open(ASSETS) |
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.then(cache => cache.addAll(to_cache)) |
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.then(() => { |
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self.skipWaiting(); |
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}) |
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); |
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}); |
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self.addEventListener('activate', event => { |
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event.waitUntil( |
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caches.keys().then(async keys => { |
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// delete old caches |
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for (const key of keys) { |
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if (key !== ASSETS) await caches.delete(key); |
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} |
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self.clients.claim(); |
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}) |
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); |
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}); |
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/** |
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* Fetch the asset from the network and store it in the cache. |
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* Fall back to the cache if the user is offline. |
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*/ |
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async function fetchAndCache(request) { |
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const cache = await caches.open(`offline${timestamp}`) |
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try { |
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const response = await fetch(request); |
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cache.put(request, response.clone()); |
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return response; |
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} catch (err) { |
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const response = await cache.match(request); |
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if (response) return response; |
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throw err; |
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} |
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} |
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self.addEventListener('fetch', event => { |
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if (event.request.method !== 'GET' || event.request.headers.has('range')) return; |
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const url = new URL(event.request.url); |
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// don't try to handle e.g. data: URIs |
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const isHttp = url.protocol.startsWith('http'); |
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const isDevServerRequest = url.hostname === self.location.hostname && url.port !== self.location.port; |
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const isStaticAsset = url.host === self.location.host && staticAssets.has(url.pathname); |
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const skipBecauseUncached = event.request.cache === 'only-if-cached' && !isStaticAsset; |
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if (isHttp && !isDevServerRequest && !skipBecauseUncached) { |
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event.respondWith( |
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(async () => { |
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// always serve static files and bundler-generated assets from cache. |
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// if your application has other URLs with data that will never change, |
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// set this variable to true for them and they will only be fetched once. |
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const cachedAsset = isStaticAsset && await caches.match(event.request); |
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// for pages, you might want to serve a shell `service-worker-index.html` file, |
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// which Sapper has generated for you. It's not right for every |
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// app, but if it's right for yours then uncomment this section |
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/* |
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if (!cachedAsset && url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) { |
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return caches.match('/service-worker-index.html'); |
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} |
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*/ |
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return cachedAsset || fetchAndCache(event.request); |
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})() |
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); |
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} |
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});
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