55 строки
2.0 KiB
JavaScript
55 строки
2.0 KiB
JavaScript
/* global fetch */
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// Install the Service Worker ASAP.
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self.oninstall = function(event) {
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event.waitUntil(self.skipWaiting());
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};
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self.onactivate = function(event) {
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event.waitUntil(self.clients.claim());
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};
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// When fetching, distinguish on the method. This is naive but it suffices for
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// the example. For more sophisticated routing alternatives, use
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// [ServiceWorkerWare](https://github.com/gaia-components/serviceworkerware/)
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// or [sw-toolbox](https://github.com/GoogleChrome/sw-toolbox).
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self.onfetch = function(event) {
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// For this example, `GET` implies looking for a cached copy...
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if (event.request.method === 'GET') {
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event.respondWith(getFromRenderStoreOrNetwork(event.request));
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} else {
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// While `PUT` means to cache contents...
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event.respondWith(cacheInRenderStore(event.request).then(function() {
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return new Response({ status: 202 });
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}));
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}
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};
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// It tries to recover a cached copy for the document. If not found,
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// it respond from the network.
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function getFromRenderStoreOrNetwork(request) {
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return self.caches.open('render-store').then(function(cache) {
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return cache.match(request).then(function(match) {
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return match || fetch(request);
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});
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});
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}
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// Obtains the interpolated HTML contents of a `PUT` request from the
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// `pokemon.js` client code and crafts an HTML response for the interpolated
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// result.
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function cacheInRenderStore(request) {
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return request.text().then(function(contents) {
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// Craft a `text/html` response for the contents to be cached.
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var headers = { 'Content-Type': 'text/html' };
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var response = new Response(contents, { headers: headers });
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return self.caches.open('render-store').then(function(cache) {
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// Associate the crafted response with the
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// [`referrer`](https://developer.mozilla.org/en-US/docs/Web/API/Request/referrer)
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// property of the request which is the URL of the client page
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// initiating the request.
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return cache.put(request.referrer, response);
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});
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});
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}
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