Service Workers - Beyond The Cache (NDC Sydney)

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SERVICE WORKERS BEYOND THE CACHE

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Phil Nash @philnash http:/ /philna.sh [email protected]

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SERVICE WORKER

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Service Worker Support ✅ ✅ ✅ ✅ ✅ @philnash

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No content

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CACHING @philnash

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@philnash

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BETTER RESILIENCY BETTER PERFORMANCE @philnash

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BETTER EXPERIENCES @philnash

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BEYOND THE CACHE @philnash

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PUSH NOTIFICATIONS BACKGROUND SYNC @philnash

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PUSH NOTIFICATIONS

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Push Noti cation Support ✅ ✅ ✅ ❌ ✅ @philnash

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@philnash

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74.86% GLOBALLY — caniuse.com @philnash

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PUSH NOTIFICATIONS ARE INCREDIBLY USEFUL @philnash

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Good noti cations • Appointment reminders • Chat alerts • ETA alerts • Event updates @philnash

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TIMELY, ACTIONABLE AND PERSONAL @philnash

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TIMELY @philnash

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Timely noti cations "Daisy just sent you a message" "Your car is here now" "You can check in now" @philnash

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@philnash

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@philnash

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IN TIME AT THE RIGHT TIME OF DAY, IN THE RIGHT TIME ZONE, THE RIGHT NUMBER OF NOTIFICATIONS @philnash

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ACTIONABLE @philnash

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Actionable noti cations "Daisy sent you a message" "Your car is here now" "You can check in now" @philnash

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PERSONAL @philnash

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Personal noti cations "Daisy sent you a message" "Your car is here" "You can check in now" @philnash

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HOW TO PUSH @philnash

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@philnash

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VAPID @philnash

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VOLUNTARY APPLICATION SERVER IDENTIFICATION FOR WEB PUSH @philnash

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VOLUNTARY APPLICATION SERVER IDENTIFICATION FOR WEB PUSH @philnash

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VAPID (Node.js) npx web-push generate-vapid-keys ======================================= Public Key: BPARzOEvMc0MkHDN7TT25vorJ1vA9pmbEVUE6T-C6Ori3f8hylaeflA89QF... Private Key: 0mLkNulmnEB1jQxvrZ7hyWDfbWMQh2IcdxmeZtEbUIw ======================================= @philnash

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VAPID (C#) VapidDetails vapidKeys = VapidHelper.GenerateVapidKeys(); Console.WriteLine("Public {0}", vapidKeys.PublicKey); Console.WriteLine("Private {0}", vapidKeys.PrivateKey); 01. 02. 03. @philnash

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VAPID Subscribe to push noti cations with public key Sign a JWT with private key when sending a push This identi es your application @philnash

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Subscribe to noti cations const convertedVapidKey = urlBase64ToUint8Array( window.vapidPublicKey ); 01. 02. 03. @philnash

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Subscribe to noti cations navigator.serviceWorker.ready.then(registration => { registration.pushManager .subscribe({ userVisibleOnly: true, applicationServerKey: convertedVapidKey }) }); 01. 02. 03. 04. 05. 06. 07. @philnash

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Subscribe to noti cations registration.pushManager.subscribe({ ... }).then(subscription => { fetch('/push/subscription', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(subscription.toJSON()) }); }); 01. 02. 03. 04. 05. 06. 07. @philnash

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Subscription { endpoint: 'https://fcm.googleapis.com/fcm/send/f3N3TXN...', expirationTime: null, keys: { p256dh: 'BKuQYOiY2gicUmqPh9MVVDoWjYbi1kby2tgBEjt-tDU...', auth: '-Nri1DXMcRW_WheTK4lU8w' } } 01. 02. 03. 04. 05. 06. 07. 08. @philnash

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Send Noti cation (Node.js) const webPush = require('web-push'); webPush.setVapidDetails( 'mailto:[email protected]', config.vapidPublicKey, config.vapidPrivateKey ); 01. 02. 03. 04. 05. 06. @philnash

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Send Noti cation (Node.js) webPush.sendNotification( subscription, JSON.stringify(data) ); 01. 02. 03. 04. @philnash

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Send Noti cation (C#) using WebPush; var subscription = new PushSubscription(pushEndpoint, p256dh, auth); var vapidDetails = new VapidDetails(subject, publicKey, privateKey); var webPushClient = new WebPushClient(); webPushClient.SendNotification(subscription, "payload", vapidDetails); 01. 02. 03. 04. 05. 06. @philnash

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Receive noti cation (service worker) self.addEventListener('push', event => { const data = event.data.json(); event.waitUntil( self.registration.showNotification(data.title, { body: data.body, }) ); }); 01. 02. 03. 04. 05. 06. 07. 08. @philnash

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Libraries https:/ /github.com/web-push-libs @philnash

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DEMO

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WE NEED TO TALK ABOUT... @philnash

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PERMISSIONS

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Ketan Joshi @KetanJ0 Dear website, - I don't want you to post notiﬁcations to my desktop - I don't want to subscribe to your thing via a popup - I don't want you to know my location - Please stop autoplaying that video - I am angry and sad now 7:17 PM - May 13, 2018 31K 8,535 people are talking about this @philnash

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WEB DEVELOPERS ARE MAKING USERS SAD AND ANGRY @philnash

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Permissions • Push noti cations • Geolocation • Media Devices • Bluetooth, MIDI, WebUSB... @philnash

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@philnash

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@philnash

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@philnash

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@philnash

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@philnash

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NO CONTEXT @philnash

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STOP THIS!

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@philnash

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PLEASE

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DO NOT DEMAND NOTIFICATION PERMISSIONS ON PAGE LOAD @philnash

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WORRY

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PERMISSIONS WILL BECOME THE NEW POPUPS @philnash

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@philnash

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@philnash

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PLEASE

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DO NOT DEMAND NOTIFICATION PERMISSIONS ON PAGE LOAD @philnash

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SUGGESTIONS

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WAIT @philnash

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@philnash

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@philnash

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UNLESS IT'S OBVIOUS @philnash

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@philnash

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LET THEM OPT OUT WITHIN YOUR APPLICATION @philnash

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@philnash

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THE ALTERNATIVE? @philnash

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@philnash

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USE PUSH NOTIFICATIONS FOR GOOD @philnash

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BACKGROUND SYNC

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IF CACHES ARE FOR GET REQUESTS @philnash

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THEN BACKGROUD SYNC IS FOR POST REQUESTS @philnash

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Background sync • Sending messages • Posting comments • Adding to a shopping cart • Liking or favouriting @philnash

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@philnash

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@philnash

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@philnash

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BACK ONLINE API

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Background Sync Support ✅ ✅ ❌ ❌ ❌ @philnash

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Background Sync Support ✅ ✅ ✅ ✅ @philnash

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67.87% GLOBALLY — caniuse.com @philnash

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INDEXEDDB @philnash

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The plan 1. Request fails due to network 2. Save request data in IndexedDB 3. User comes back online 4. Sync event res, replay request @philnash

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Register for Sync event fetch(url, { ... }).catch(err => { navigator.serviceWorker.ready.then(reg => { saveDataToIndexedDB(); reg.sync.register('fail'); }); }); 01. 02. 03. 04. 05. 06. @philnash

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Service worker sync event self.addEventListener('sync', event => { getDataFromIndexedDB().then(data => { sendData(data); }); }); 01. 02. 03. 04. 05. @philnash

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DEMO

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LIBRARIES

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@philnash

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Workbox const bgSyncPlugin = new workbox.backgroundSync.Plugin('myQueueName', { maxRetentionTime: 24 * 60 // Retry for max of 24 Hours }); workbox.routing.registerRoute( /\/api\/.*\/*.json/, workbox.strategies.networkOnly({ plugins: [bgSyncPlugin] }), 'POST' ); 01. 02. 03. 04. 05. 06. 07. 08. 09. 10. @philnash

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ENHANCE YOUR FORMS WITH BACKGROUND SYNC @philnash

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EXPERIMENTAL

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BACKGROUND FETCH

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On the page navigator.serviceWorker.ready.then(function(reg) { const url = "https://example.com/largeFile.mp3"; reg.backgroundFetch.fetch('downloads', [url], { icons: [], title: 'Downloading largeFile.mp3', totalDownloadSize: 1048576 }); }); 01. 02. 03. 04. 05. 06. 07. 08. @philnash

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In the service worker self.addEventListener('backgroundfetched', function(event) { if (event.tag === 'downloads') { event.updateUI('largeFile.mp3 downloaded.'); // add the file to the cache } }); 01. 02. 03. 04. 05. 06. @philnash

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Background fetch • Audio and video • Games • WebAssembly @philnash

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CONCLUSION

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Not just features • Push noti cations • Background Sync • Background Fetch @philnash

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BETTER EXPERIENCES @philnash

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THANKS!

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Icon Credits • Browser by Kimmi Studio from the Noun Project • Cloud by Kimmi Studio from the Noun Project • Gears by TS Graphics from the Noun Project • wi by i cons from the Noun Project @philnash