Service Worker - Out of the shadows – CSS day 2019

Slide 1

Slide 1 text

Service workers O U T O F T H E S H A D O W S

Slide 2

Slide 2 text

Andrea De Carolis @DECAROLA @WEAREMO DO Foto: Francesco Ridolﬁ

Slide 3

Slide 3 text

Service worker O U T O F T H E S H A D O W S

Slide 4

Slide 4 text

No content

Slide 5

Slide 5 text

what’s Service Worker

Slide 6

Slide 6 text

TL;DR

Slide 7

Slide 7 text

Sono Script Che Intercettano Richieste Di Rete

Slide 8

Slide 8 text

Request Response

Slide 9

Slide 9 text

Request Response Request Response

Slide 10

Slide 10 text

Request Response Request Response

Slide 11

Slide 11 text

1. Gestire LA Ux Offline

Slide 12

Slide 12 text

Esempi

Slide 13

Slide 13 text

No content

Slide 14

Slide 14 text

No content

Slide 15

Slide 15 text

No content

Slide 16

Slide 16 text

No content

Slide 17

Slide 17 text

No content

Slide 18

Slide 18 text

No content

Slide 19

Slide 19 text

No content

Slide 20

Slide 20 text

No content

Slide 21

Slide 21 text

No content

Slide 22

Slide 22 text

2. Da Sito A Pwa

Slide 23

Slide 23 text

HTML CSS JS SW

Slide 24

Slide 24 text

SITO PWA

Slide 25

Slide 25 text

SITO SW

Slide 26

Slide 26 text

SITO PWA

Slide 27

Slide 27 text

Fattibile?

Slide 28

Slide 28 text

HTTPS Same-origin

Slide 29

Slide 29 text

No content

Slide 30

Slide 30 text

if (navigator.serviceWorker) { // $ }

Slide 31

Slide 31 text

if (navigator.serviceWorker) { navigator.serviceWorker.register('/sw.js'); }

Slide 32

Slide 32 text

• Script che intercetta le richieste di rete • Gestisci la UX oﬄine, sito → PWA • Supporto $

Slide 33

Slide 33 text

Codice

Slide 34

Slide 34 text

1. Si scarica. 2. Si installa (…). 3. Si attiva.

Slide 35

Slide 35 text

1. Si scarica. 2. Si installa (…). 3. Si attiva.

Slide 36

Slide 36 text

addEventListener('install', installEvent => {});

Slide 37

Slide 37 text

Stip ‘ca trov

Slide 38

Slide 38 text

Cache

Slide 39

Slide 39 text

const staticCacheName = 'staticﬁles'; caches.open(staticCacheName) .then( staticCache => { // Stip ‘ca trov! })

Slide 40

Slide 40 text

const staticCacheName = 'staticfiles'; caches.open(staticCacheName) .then( staticCache => { staticCache.addAll([ '/css/stylesheet.css', '/js/javascript.js', '/fonts/font.woff', '/images/icon.svg' ]); })

Slide 41

Slide 41 text

const staticCacheName = 'staticfiles'; caches.open(staticCacheName) .then( staticCache => { return staticCache.addAll([ '/css/stylesheet.css', '/js/javascript.js', '/fonts/font.woff', '/images/icon.svg' ]); })

Slide 42

Slide 42 text

1.Si scarica. 2.Si installa (…). 3.Si attiva.

Slide 43

Slide 43 text

addEventListener('activate', fetchEvent =>{ console.log(''); });

Slide 44

Slide 44 text

1.Si scarica. 2.Si installa (…). 3.Si attiva.

Slide 45

Slide 45 text

Fetch

Slide 46

Slide 46 text

addEventListener('fetch', fetchEvent => { const request = fetchEvent.request; });

Slide 47

Slide 47 text

if (request.headers.get('Accept').includes('text/html')){} // HTML? if (request.headers.get(‘Accept’).includes('image')){} // IMG? if (request.headers.get(‘Accept’).includes('pizza')){} //

Slide 48

Slide 48 text

if (request.headers.get('Accept').includes('text/html')){} // HTML? if (request.headers.get(‘Accept’).includes('image')){} // IMG? else {} // “Altro?”

Slide 49

Slide 49 text

STRATEGIE • Solo dalla rete/cache. • Prima dalla rete/cache. • Chi arriva prima.

Slide 50

Slide 50 text

No content

Slide 51

Slide 51 text

Prima La Cache, Poi La Rete.

Slide 52

Slide 52 text

Prima La Cache, Poi La Rete. Nel Caso, Stip 'Ca Trov.

Slide 53

Slide 53 text

addEventListener('fetch', fetchEvent => { const request = fetchEvent.request; });

Slide 54

Slide 54 text

if (request.headers.get('Accept').includes('image')) { fetchEvent.respondWith( // o ); return; }

Slide 55

Slide 55 text

if (request.headers.get('Accept').includes('image')) { fetchEvent.respondWith( caches.match(request) // Cerca nella cache .then(responseFromCache => { if (responseFromCache) { return responseFromCache; } }) ); // fetchEvent.respondWith return; }

Slide 56

Slide 56 text

caches.match(request) // Cerca nella cache .then(responseFromCache => { if (responseFromCache) { return responseFromCache; } return fetch(request) // Vai con la rete .then(responseFromFetch => { // Stip 'ca trov const copy = responseFromFetch.clone(); fetchEvent.waitUntil( caches.open(imageCacheName) .then(imageCache => { return imageCache.put(request, copy); }) ); return responseFromFetch; }); }) // end match then ); // end respondWith

Slide 57

Slide 57 text

if (request.headers.get('Accept').includes('image')) { // Solo immagini fetchEvent.respondWith( caches.match(request) .then(responseFromCache => { // Controlla la cache if (responseFromCache) { return responseFromCache; } return fetch(request) .then(responseFromFetch => { // Altrimenti dalla rete const copy = responseFromFetch.clone(); fetchEvent.waitUntil( caches.open(imageCacheName) // Stip 'ca trov .then(imageCache => { return imageCache.put(request, copy); }) ); return responseFromFetch; }); }) ); return; }

Slide 58

Slide 58 text

Slide 59

Slide 59 text

Slide 60

Slide 60 text

Ottimismo!

Slide 61

Slide 61 text

SW-TOOLBOX BY GO OGLE

Slide 62

Slide 62 text

toolbox.router.get('/index.html', toolbox.networkFirst);

Slide 63

Slide 63 text

toolbox.router.default = toolbox.networkFirst;

Slide 64

Slide 64 text

• networkOnly – only fetch from network • cacheOnly – only fetch from cache • fastest – fetch from both, and respond with whichever comes ﬁrst • networkFirst – fetch from network, if that fails, fetch from cache • cacheFirst – fetch from cache, but also fetch from network and update cache