The Next Evolution of Chrome Apps - Devoxx 2012

A brief introduction to the new Chrome Apps platform and why we are doing it.

Transcript

1. ME DEVELOPER ADVOCATE AT GOOGLE @Paul Kinlan
2. NEXT EVOLUTION OF CHROME APPS DEVOXX 2012 By @Paul Kinlan
3. I HEARD THIS ON A TRAIN “Oh I don't use apps on the web, I just use it for news and wikipedia” — Some guy
4. AVAILABILITY “Availability - noun: The act of being awesome all the time.” — Kinsters Compendium of Wordage
5. WHY OFFLINE? 1. Mobile? 2. Responsiveness? Be there when your users need you.
6. EXPERIMENT WITH OFFLINE APPS Top 50(ish) apps on iOS and Android Downloaded App Pulled the plug Loaded app
8. SAME EXPERIMENT WITH OFFLINE WEB APPS
9. MOST APPS
10. THE EXCEPTION
11. SUMMARY Native Apps win hands down Lots works brilliantly offline, no online requirement. Many load and offer UI with cached content but needs web for more information. Many games loads and then download even more data. Minority of apps fail to load. The user is kept inside the app experience
12. WEB DEVELOPERS ARE FROM VENUS “I will add offline support into my app” — A Web Dev “I will add online support into my app” — An App Dev
13. WARNING OFFLINE APPS ARE A PARADIGM SHIFT FOR WEB DEVELOPERS THE WEB IS A HODGE-PODGE OF API'S THAT DON'T QUITE WORK TOGETHER
14. APPCACHE If you want to have any offline experience at all, you have to use it.
16. STORAGE? If you want to have any offline storage at all, you have to use both indexedDB and WebSQL. Note: The versioning API just changed :\
17. CHROME APPS A NEW PLATFORM
18. WHY?!?!
19. APPS SHOULD BE OFFLINE BY DEFAULT Apps should load regardless of connection.
20. APPS SHOULD LOOK AND FEEL NATIVE
21. APPS SHOULD BE ABLE ACCESS TO NATIVE API'S Network Sockets Serial Ports USB and Bluetooth File System Media Galleries
22. APPS SHOULD BE SECURE BY DEFAULT CSP FTW! # B l o c k e v e r y t h i n g , t h e n w h i t e l i s t f r o m t h e r e . d e f a u l t - s r c ' n o n e ' ; # A c c e p t C S S f r o m t h e e x t e n s i o n ' s p a c k a g e . s t y l e - s r c ' s e l f ' ; # A c c e p t J a v a S c r i p t f r o m t h e e x t e n s i o n ' s p a c k a g e . s c r i p t - s r c ' s e l f ' ; # A l l o w i m a g e s f r o m G o o g l e M a p s t o l o a d o v e r H T T P S . i m g - s r c h t t p s : / / m a p s . g o o g l e . c o m ; a l e r t ( e v a l ( " f o o . b a r . b a z " ) ) ; w i n d o w . s e t T i m e o u t ( " a l e r t ( ' h i ' ) " , 1 0 ) ; w i n d o w . s e t I n t e r a l ( " a l e r t ( ' h i ' ) " , 1 0 ) ; n e w F u n c t i o n ( " r e t u r n f o o . b a r . b a z " ) ;
23. FINALLY. APPS SHOULD BE BUILT USING TECHNOLOGY THAT WE KNOW AND LOVE HTML CSS JAVASCRIPT
24. ACCESS TO HARDWARE NETWORK SOCKETS WEB SERVER IN THE BROWSER
25. IT'S JUST A SOCKET v a r s o c k e t = c h r o m e . s o c k e t ; s o c k e t . c r e a t e ( " t c p " , { } , f u n c t i o n ( _ s o c k e t I n f o ) { s o c k e t I n f o = _ s o c k e t I n f o ; / / C a c h e g l o b a l l y [ e e k ] s o c k e t . l i s t e n ( s o c k e t I n f o . s o c k e t I d , " 1 2 7 . 0 . 0 . 1 " , 8 0 8 0 , 2 0 , f u n c t i o n ( r e s u l t ) { / / A c c e p t t h e f i r s t r e s p o n s e s o c k e t . a c c e p t ( s o c k e t I n f o . s o c k e t I d , o n A c c e p t ) ; } ) ; } ) ;
26. BUT THERE IS A LOT OF CODE v a r o n A c c e p t = f u n c t i o n ( a c c e p t I n f o ) { / / T h i s i s a r e q u e s t t h a t t h e s y s t e m i s p r o c e s s i n g . / / R e a d t h e d a t a . s o c k e t . r e a d ( a c c e p t I n f o . s o c k e t I d , f u n c t i o n ( r e a d I n f o ) { / / P a r s e t h e r e q u e s t . v a r d a t a = a r r a y B u f f e r T o S t r i n g ( r e a d I n f o . d a t a ) ; / / W e o n l y w a n t t o h a n d l e g e t r e q u e s t s i f ( d a t a . i n d e x O f ( " G E T " ) = = 0 ) { / / w e c a n o n l y d e a l w i t h G E T r e q u e s t s v a r u r i E n d = d a t a . i n d e x O f ( " " , 4 ) ; i f ( u r i E n d < 0 ) { / * t h r o w a w o b b l e r * / r e t u r n ; } v a r u r i = d a t a . s u b s t r i n g ( 4 , u r i E n d ) ; v a r f i l e = f i l e s M a p [ u r i ] ; / / p i c k o u t t h e f i l e w e w a n t t o s e r v e r i f ( ! ! f i l e = = f a l s e ) { / * F i l e d o e s n o t e x i s t * / r e t u r n ; } w r i t e 2 0 0 R e s p o n s e ( a c c e p t I n f o . s o c k e t I d , f i l e ) ; } e l s e { / / T h r o w a n e r r o r s o c k e t . d e s t r o y ( a c c e p t I n f o . s o c k e t I d ) ; / / W e n e e d t o s a y t h a t w e c a n a c c e p t a n o t h e r i n c o m i n g r e q u e s t . s o c k e t . a c c e p t ( s o c k e t I n f o . s o c k e t I d , o n A c c e p t ) ; } } ) ; } ;
27. CAN WE USE AN EXISTING ECO- SYSTEM?
28. LIKE NODE?
29. NODE API'S IN THE BROWSER MARKDOWN o n l o a d = f u n c t i o n ( ) { v a r m d E l = d o c u m e n t . g e t E l e m e n t B y I d ( " m a r k d o w n " ) ; v a r h t m l E l = d o c u m e n t . g e t E l e m e n t B y I d ( " h t m l " ) ; v a r m d = r e q u i r e ( " m a r k d o w n " ) . m a r k d o w n ; m d E l . o n k e y p r e s s = f u n c t i o n ( ) { v a r o u t p u t = m d . t o H T M L ( m d E l . v a l u e ) ; h t m l E l . i n n e r H T M L = o u t p u t ; } ; } ; $ b r o w s e r i f y - r m a r k d o w n - o b u n d l e . j s
30. NODE API'S IN THE BROWSER BROWSERIFY + CHROME MAPPING = WIN powered by https://github.com/iceddev/http-chromify Browserify Chrome v a r h t t p = r e q u i r e ( ' h t t p ' ) ; h t t p . c r e a t e S e r v e r ( f u n c t i o n ( r e q , r e s ) { r e s . w r i t e H e a d ( 2 0 0 , { ' C o n t e n t - T y p e ' : ' t e x t / p l a i n ' } ) ; r e s . e n d ( ' H e l l o W o r l d \ n ' ) ; } ) . l i s t e n ( 1 3 3 7 , ' 1 2 7 . 0 . 0 . 1 ' ) ; c o n s o l e . l o g ( ' S e r v e r r u n n i n g a t h t t p : / / 1 2 7 . 0 . 0 . 1 : 1 3 3 7 / ' ) ;
31. CLOSING THOUGHTS
32. DO AWESOME
33. AND BUILD DRONES youtube.com/watch?v=K7sG1dRSn4c
34. THANKS @Paul_Kinlan +Paul Kinlan http://paul.kinlan.me LINKS Browserify - Chromeify - net - http - github.com/substack/node-browserify github.com/GoogleChrome/browserify-chrome github.com/GoogleChrome/net-chromeify github.com/iceddev/http-chromify