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sw.js
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sw.js
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/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
importScripts('/__WORKBOX/buildFile/workbox-sw');
importScripts('/infra/testing/comlink/sw-interface.js');
workbox.setConfig({modulePathPrefix: '/__WORKBOX/buildFile/'});
const sleep = async (ms) => {
return new Promise((resolve) => setTimeout(resolve, ms));
};
// Spy on .fetch() calls from inside the service worker.
// If `simulateOffline` is set to true, throw a network error.
let simulateOffline = false;
let spiedRequests = [];
const originalFetch = self.fetch;
self.fetch = async (...args) => {
if (simulateOffline) {
// Simulate network latency, so the sync event doesn't just fire
// in an endless loop.
await sleep(100);
throw new Error('Simulated network error');
}
const clone = args[0] instanceof Request ?
args[0].clone() : new Request(args[0]);
spiedRequests.push({
url: clone.url,
timestamp: Date.now(),
body: await clone.text(),
});
return originalFetch(...args);
};
// Add a message listener for communication between the client and SW.
self.addEventListener('message', (evt) => {
switch (evt.data.action) {
case 'simulate-offline':
simulateOffline = evt.data.value;
evt.ports[0].postMessage(null);
break;
case 'clear-spied-requests':
spiedRequests = [];
evt.ports[0].postMessage(null);
break;
case 'get-spied-requests':
evt.ports[0].postMessage(spiedRequests);
break;
case 'dispatch-sync-event':
{
// Override `.waitUntil` so we can signal when the sync is done.
const originalSyncEventWaitUntil = SyncEvent.prototype.waitUntil;
SyncEvent.prototype.waitUntil = (promise) => {
return promise.then(() => evt.ports[0].postMessage(null));
};
self.dispatchEvent(new SyncEvent('sync', {
tag: 'workbox-background-sync:workbox-google-analytics',
}));
SyncEvent.prototype.waitUntil = originalSyncEventWaitUntil;
break;
}
}
});
workbox.googleAnalytics.initialize();
self.addEventListener('install', (evt) => evt.waitUntil(self.skipWaiting()));
self.addEventListener('activate', (evt) => evt.waitUntil(self.clients.claim()));