iPhone Python love affair

AN IPHONE-PYTHON LOVE AFFAIR Building APIs for MobileWednesday, June 8, 2011

Music Hack Day, February 2011 Samantha & MattWednesday, June 8, 2011

ACCOMPLICE #1 Anna Callahan: iOS developer, jazz trumpet player @jazztptWednesday, June 8, 2011

ACCOMPLICE #2 Nate Aune: Django/Python/Plone developer, saxophonist @nateaWednesday, June 8, 2011

VALENTUN.ES!Wednesday, June 8, 2011

Wednesday, June 8, 2011

MOBILE TAKEOVER If you’re not building for mobile now, you will be soon.Wednesday, June 8, 2011

WHAT’S DIFFERENT ABOUT MOBILE? • Isn’t REST appropriate for everything? • Don’t I want a single API for all clients?Wednesday, June 8, 2011

WHAT’S DIFFERENT ABOUT MOBILE? Mobile users are unwilling to wait. 1. Connection = slow, spotty, or non-existent 2. Mobile is not as powerful at fetching & saving data or calculationsWednesday, June 8, 2011

SO YOUR API SHOULD • Return hierarchies of related data • Authentication and Authorization • Have mobile-speciﬁc error codes & messages • Accept arrays of related or unrelated data • Return pre-calculated data or data that doesn’t exist on deviceWednesday, June 8, 2011

HIERARCHIES OF DATA Bad :( Good! Cards TracksWednesday, June 8, 2011

CARD CLASSWednesday, June 8, 2011

TRACK CLASSWednesday, June 8, 2011

SIMPLE REST API Basic CRUD operations via API.Wednesday, June 8, 2011

URLS.PY Now access cards and tracks with /api/card/ and /api/track/Wednesday, June 8, 2011

CREATE A CARDWednesday, June 8, 2011

WHAT ABOUT TRACKS? Default post_list from resources.py (create object via POST)Wednesday, June 8, 2011

WHAT ABOUT TRACKS? api.py post_list (override method)Wednesday, June 8, 2011

MOBILE WANTS HIERARCHICAL DATAWednesday, June 8, 2011

TASTYPIE MAKES IT EASYWednesday, June 8, 2011

AUTHENTICATION & AUTHORIZATION Authentication - let the user in the door Authorization - what the user can seeWednesday, June 8, 2011

LIMITING BY USER Returns only the objects owned by the current user.Wednesday, June 8, 2011

ERROR CODES Ideally your API should: •Never return HTML •Tailor response codes to actions on device •Return messages designed for the end user •Never, ever return HTMLWednesday, June 8, 2011

JSON ERROR RESPONSES override wrap_view from resources.pyWednesday, June 8, 2011

JSON ERROR HANDLING Objective-C in XcodeWednesday, June 8, 2011

Wednesday, June 8, 2011

ACCEPT ARRAYS OF DATA • User enters tunnel • User uses your app • User closes your app • User exits tunnelWednesday, June 8, 2011

PRE-CALCULATED DATA OR DATA NOT STORED ON DEVICE • No other users are stored on device • Leaderboards or other calculated user data must come from the serverWednesday, June 8, 2011

THANK YOU! • Music Hack Day Accomplices: Matt Katz, Alexandre Passant, Jeff Novich, Twom Deryckere • Danielzilla (Daniel Lindsley) - TastyPie • IsaacKelly • DjangoConWednesday, June 8, 2011

MORE INFO • Valentun.es live site http://valentun.es • Valentunes (Django code) https://github.com/natea/valentunes • Valentunes (iPhone code) https://github.com/jazztpt/Valentunes_iPhone • Valentunes (Twilio integration) https://github.com/terraces/valentunes-twilioWednesday, June 8, 2011

DJANGO API FRAMEWORKS • TastyPie documentation (the one we used) http://readthedocs.org/docs/django-tastypie/en/latest/ • django-piston https://bitbucket.org/jespern/django-piston/ • Django REST framework http://django-rest-framework.orgWednesday, June 8, 2011

iPhone Python love affair

by Anna Callahan

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