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service-worker.js
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service-worker.js
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"use strict";
console.log('WORKER: executing.');
let version = 'reviews-v2';
let idbVersion = 'test1';
let db;
let dbReq = indexedDB.open(idbVersion, 1);
console.log('dbReq', dbReq);
dbReq.onupgradeneeded = function(event) {
console.log('onupgradeneeded', event.target);
// Set the db variable to our database so we can use it!
db = event.target.result;
// Create an object store named notes. Object stores
// in databases are where data are stored.
let restaurants = db.createObjectStore('restaurants', {autoIncrement: true});
};
dbReq.onsuccess = function(event) {
console.log('onsuccess', event.target);
db = event.target.result;
};
dbReq.onerror = function(event) {
console.log('onerror', event.target);
console.log('error opening database ' + event.target.errorCode);
};
let offlineFundamentals = [
'/',
'index.html',
'restaurant.html',
'css/styles.css',
'js/main.js',
'js/dbhelper.js',
'js/restaurant_info.js',
'img/icon.png',
'dist/1-200px.jpg',
'dist/1-500px.jpg',
'dist/1-630px.jpg',
'dist/2-200px.jpg',
'dist/2-500px.jpg',
'dist/2-630px.jpg',
'dist/3-200px.jpg',
'dist/3-500px.jpg',
'dist/3-630px.jpg',
'dist/4-200px.jpg',
'dist/4-500px.jpg',
'dist/4-630px.jpg',
'dist/5-200px.jpg',
'dist/5-500px.jpg',
'dist/5-630px.jpg',
'dist/6-200px.jpg',
'dist/6-500px.jpg',
'dist/6-630px.jpg',
'dist/7-200px.jpg',
'dist/7-500px.jpg',
'dist/7-630px.jpg',
'dist/8-200px.jpg',
'dist/8-500px.jpg',
'dist/8-630px.jpg',
'dist/9-200px.jpg',
'dist/9-500px.jpg',
'dist/9-630px.jpg',
'dist/10-200px.jpg',
'dist/10-500px.jpg',
'dist/10-630px.jpg',
'https://unpkg.com/[email protected]/dist/leaflet.css',
'https://unpkg.com/[email protected]/dist/leaflet.js',
];
self.addEventListener("install", event => {
console.log('WORKER: install event in progress.');
event.waitUntil(
caches
.open(version)
.then(cache => {
return cache.addAll(offlineFundamentals);
})
.then(() => {
console.log('WORKER: install completed');
})
);
});
self.addEventListener("fetch", event => {
console.log('WORKER: fetch event in progress.');
if (event.request.method !== 'GET') {
// console.log('WORKER: fetch event ignored.', event.request.method, event.request.url);
return;
}
event.respondWith(
caches
.match(event.request)
.then(cached => {
let networked = fetch(event.request)
.then(fetchedFromNetwork, unableToResolve)
.catch(unableToResolve);
// console.log('WORKER: fetch event', cached ? '(cached)' : '(network)', event.request.url);
return cached || networked;
function fetchedFromNetwork(response) {
let cacheCopy = response.clone();
// console.log('WORKER: fetch response from network.', event.request.url);
caches
.open(version + 'pages')
.then(function add(cache) {
return cache.put(event.request, cacheCopy);
})
.then(() => {
// console.log('WORKER: fetch response stored in cache.', event.request.url);
});
return response;
}
function unableToResolve () {
// console.log('WORKER: fetch request failed in both cache and network.');
return new Response('<h1>Service Unavailable</h1>', {
status: 503,
statusText: 'Service Unavailable',
headers: new Headers({
'Content-Type': 'text/html',
}),
});
}
})
);
});
self.addEventListener("activate", event => {
console.log('WORKER: activate event in progress.');
event.waitUntil(
caches
.keys()
.then(keys => {
return Promise.all(
keys
.filter(key => {
return !key.startsWith(version);
})
.map(key => {
return caches.delete(key);
})
);
})
.then(() => {
console.log('WORKER: activate completed.');
})
);
});
self.addEventListener("message", event => {
if (event.data.action === 'skipWaiting') {
self.skipWaiting();
}
});