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// This is the service worker with the Cache-first network
const CACHE = "pwabuilder-precache";
const precacheFiles = [
/* Add an array of files to precache for your app */
];
self.addEventListener("install", function (event) {
console.log("[PWA Builder] Install Event processing");
console.log("[PWA Builder] Skip waiting on install");
self.skipWaiting();
event.waitUntil(
caches.open(CACHE).then(function (cache) {
console.log("[PWA Builder] Caching pages during install");
return cache.addAll(precacheFiles);
})
);
});
// Allow sw to control of current page
self.addEventListener("activate", function (event) {
console.log("[PWA Builder] Claiming clients for current page");
event.waitUntil(self.clients.claim());
});
// If any fetch fails, it will look for the request in the cache and serve it from there first
self.addEventListener("fetch", function (event) {
if (event.request.method !== "GET") return;
event.respondWith(
fromCache(event.request).then(
function (response) {
// The response was found in the cache so we responde with it and update the entry
// This is where we call the server to get the newest version of the
// file to use the next time we show view
event.waitUntil(
fetch(event.request).then(function (response) {
return updateCache(event.request, response);
})
);
return response;
},
function () {
// The response was not found in the cache so we look for it on the server
return fetch(event.request)
.then(function (response) {
// If request was success, add or update it in the cache
event.waitUntil(updateCache(event.request, response.clone()));
return response;
})
.catch(function (error) {
console.log("[PWA Builder] Network request failed and no cache." + error);
});
}
)
);
});
function fromCache(request) {
// Check to see if you have it in the cache
// Return response
// If not in the cache, then return
return caches.open(CACHE).then(function (cache) {
return cache.match(request).then(function (matching) {
if (!matching || matching.status === 404) {
return Promise.reject("no-match");
}
return matching;
});
});
}
function updateCache(request, response) {
return caches.open(CACHE).then(function (cache) {
return cache.put(request, response);
});
}
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