102 lines
2.3 KiB
JavaScript
102 lines
2.3 KiB
JavaScript
const addResourcesToCache = async (resources) =>
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{
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const cache = await caches.open('v1');
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await cache.addAll(resources);
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};
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const putInCache = async (request, response) =>
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{
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const cache = await caches.open('v1');
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await cache.put(request, response);
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};
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function shouldcache(name)
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{
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if (name.indexOf("/raw/"))
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return false;
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if (name.indexOf("/downloadables"))
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return false;
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return true;
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};
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const cacheFirst = async ({ request, preloadResponsePromise }) =>
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{
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// First try to get the resource from the cache
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const responseFromCache = await caches.match(request);
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if (responseFromCache)
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{
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// console.log("cacheFirst - from cache", request, preloadResponsePromise, responseFromCache);
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return responseFromCache;
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}
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// Next try to use the preloaded response, if it's there
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const preloadResponse = await preloadResponsePromise;
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if (preloadResponse)
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{
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// console.info('using preload response', preloadResponse);
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if (shouldcache(request.url))
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putInCache(request, preloadResponse.clone());
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return preloadResponse;
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}
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// Next try to get the resource from the network
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try
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{
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const responseFromNetwork = await fetch(request.clone());
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// response may be used only once
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// we need to save clone to put one copy in cache
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// and serve second one
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if (shouldcache(request.url))
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putInCache(request, responseFromNetwork.clone());
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// console.info('fetching from network', responseFromNetwork);
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return responseFromNetwork;
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}
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catch (error)
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{
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// console.info('failure', preloadResponse);
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// there is nothing we can do, but we must always
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// return a Response object
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return new Response('Network error happened',
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{
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status: 408,
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headers: { 'Content-Type': 'text/plain' },
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});
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}
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};
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const enableNavigationPreload = async () =>
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{
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if (self.registration.navigationPreload)
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{
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// Enable navigation preloads!
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await self.registration.navigationPreload.enable();
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}
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};
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self.addEventListener('activate', (event) =>
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{
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event.waitUntil(enableNavigationPreload());
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});
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self.addEventListener('install', (event) =>
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{
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event.waitUntil(
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addResourcesToCache([
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'./',
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'./fte_pwa.json',
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'./fte_pwa_sw.js',
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'./ftewebgl.js',
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'./ftewebgl.wasm'
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])
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);
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});
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self.addEventListener('fetch', (event) =>
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{
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event.respondWith(cacheFirst(
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{
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request: event.request,
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preloadResponsePromise: event.preloadResponse
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}));
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});
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