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Code Issues Releases Activity

Fix service worker

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Lars Lehmann 2025-01-19 22:43:31 +01:00
parent 3ccd078508
commit a88e59869e
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3 changed files with 61 additions and 82 deletions
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2
frontend/src/app.html
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@ -4,7 +4,7 @@
<meta charset="utf-8" />
<link rel="icon" href="%sveltekit.assets%/favicon.png" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link name="manifest" crossorigin="use-credentials" href="manifest.json" />
<link rel="manifest" crossorigin="use-credentials" href="/manifest.json" />
%sveltekit.head%
</head>
<body data-sveltekit-preload-data="hover">

81
frontend/src/service-worker.ts
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@ -1,81 +0,0 @@
/// Source: https://dev.to/100lvlmaster/create-a-pwa-with-sveltekit-svelte-a36
/// <reference lib="webworker" />
import { build, files, timestamp } from '$service-worker';
const worker = (self as unknown) as ServiceWorkerGlobalScope;
const FILES = `cache${timestamp}`;
// `build` is an array of all the files generated by the bundler,
// `files` is an array of everything in the `static` directory
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: Request) {
const cache = await caches.open(`offline${timestamp}`);
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);
})()
);
}
});

60
frontend/src/service-worker/indes.ts Normal file
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@ -0,0 +1,60 @@
/// <reference types="@sveltejs/kit" />
import { build, files, version } from '$service-worker';
const CACHE = `cache-${version}`;
const ASSETS = [
...build, // the app itself
...files // everything in `static`
];
self.addEventListener('install', (event) => {
// Create a new cache and add all files to it
async function addFilesToCache() {
const cache = await caches.open(CACHE);
await cache.addAll(ASSETS);
}
event.waitUntil(addFilesToCache());
});
self.addEventListener('activate', (event) => {
// Remove previous cached data from disk
async function deleteOldCaches() {
for (const key of await caches.keys()) {
if (key !== CACHE) await caches.delete(key);
}
}
event.waitUntil(deleteOldCaches());
});
self.addEventListener('fetch', (event) => {
// ignore POST requests, etc
if (event.request.method !== 'GET') return;
async function respond() {
const url = new URL(event.request.url);
const cache = await caches.open(CACHE);
// `build`/`files` can always be served from the cache
if (ASSETS.includes(url.pathname)) {
return cache.match(url.pathname);
}
// for everything else, try the network first, but
// fall back to the cache if we're offline
try {
const response = await fetch(event.request);
if (response.status === 200) {
cache.put(event.request, response.clone());
}
return response;
} catch {
return cache.match(event.request);
}
}
event.respondWith(respond());
});