111 lines
3.5 KiB
JavaScript
Executable File
111 lines
3.5 KiB
JavaScript
Executable File
// Copyright 2016 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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const CACHE_VERSION = 8;
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const dataCacheName = `traintimesData-v${CACHE_VERSION}`;
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const cacheName = `traintimePWA-final-${CACHE_VERSION}`;
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const filesToCache = [
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'/',
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'/index.html',
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'/service-worker.js',
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'/manifest.json',
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'/favicon.png',
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'/browserconfig.xml',
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'/build/bundle.css',
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'/build/bundle.js',
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'/build/fonts/fujicons.css',
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'/build/fonts/fujicons.ttf',
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'/img/Icon-36.png',
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'/img/Icon-48.png',
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'/img/Icon-72.png',
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'/img/Icon-96.png',
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'/img/Icon-144.png',
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'/img/Icon-192.png',
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'/img/Icon-512.png'
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];
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self.addEventListener('install', function(e) {
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console.log('[ServiceWorker] Install');
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e.waitUntil(
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caches.open(cacheName).then(function(cache) {
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console.log('[ServiceWorker] Caching app shell');
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return cache.addAll(filesToCache);
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})
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);
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});
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self.addEventListener('activate', function(e) {
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console.log('[ServiceWorker] Activate');
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e.waitUntil(
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caches.keys().then(function(keyList) {
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return Promise.all(keyList.map(function(key) {
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if (key !== cacheName && key !== dataCacheName) {
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console.log('[ServiceWorker] Removing old cache', key);
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return caches.delete(key);
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}
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}));
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})
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);
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/*
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* Fixes a corner case in which the app wasn't returning the latest data.
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* You can reproduce the corner case by commenting out the line below and
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* then doing the following steps: 1) load app for first time so that the
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* initial New York City data is shown 2) press the refresh button on the
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* app 3) go offline 4) reload the app. You expect to see the newer NYC
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* data, but you actually see the initial data. This happens because the
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* service worker is not yet activated. The code below essentially lets
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* you activate the service worker faster.
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*/
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return self.clients.claim();
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});
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self.addEventListener('fetch', function(e) {
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console.warn('[Service Worker] Fetch', e.request.url);
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const dataUrl = '/getnexttraintimes?';
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if (e.request.url.indexOf(dataUrl) > -1) {
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console.log('!');
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/*
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* When the request URL contains dataUrl, the app is asking for fresh
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* weather data. In this case, the service worker always goes to the
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* network and then caches the response. This is called the "Cache then
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* network" strategy:
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* https://jakearchibald.com/2014/offline-cookbook/#cache-then-network
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*/
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e.respondWith(
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caches.open(dataCacheName).then(function(cache) {
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return fetch(e.request).then(function(response) {
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cache.put(e.request.url, response.clone());
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return response;
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});
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})
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);
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}
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else
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/*
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* The app is asking for app shell files. In this scenario the app uses the
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* "Cache, falling back to the network" offline strategy:
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* https://jakearchibald.com/2014/offline-cookbook/#cache-falling-back-to-network
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*/
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e.respondWith(
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caches.match(e.request).then(function(response) {
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return response || fetch(e.request);
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})
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);
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});
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