iphone-python love affair

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How to build an API for mobile devices in Django and Tastypie

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AN IPHONE-PYTHON LOVE AFFAIRBuilding APIs for Mobile

Friday, June 24, 2011

Music Hack Day, February 2011

Samantha & Matt

Friday, June 24, 2011

ACCOMPLICE #1Anna Callahan: iOS developer, jazz trumpet player @jazztptFriday, June 24, 2011

ACCOMPLICE #2Nate Aune: Django/Python/Plone developer, saxophonist @nateaFriday, June 24, 2011

VALENTUN.ES!

Friday, June 24, 2011

http://www.youtube.com/watch?v=0C02wev40K0

Friday, June 24, 2011

MOBILE TAKEOVER

If youre not building for mobile now, you will be soon.

Friday, June 24, 2011

WHATS DIFFERENT ABOUT MOBILE? Isnt

REST appropriate for everything? I want a single API for all clients?

Dont

* You or your customer controls the mobile app.Friday, June 24, 2011

WHAT IS REST?

Typical REST API implementation.Friday, June 24, 2011

WHATS 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 calculations

Friday, June 24, 2011

CREATE AN API DOC

Friday, June 24, 2011

SO YOUR API SHOULD Return

hierarchies of related data and Authorization

Authentication Have

mobile-specic error codes & messages arrays of related or unrelated data pre-calculated data or data that doesnt exist on device

Accept Return

Friday, June 24, 2011

HIERARCHIES OF DATABad :(

Good!

Cards

Tracks

Friday, June 24, 2011

CARD CLASS

Friday, June 24, 2011

TRACK CLASS

Friday, June 24, 2011

SIMPLE REST API

Basic CRUD operations via API.Friday, June 24, 2011

URLS.PY

Now access cards and tracks with /api/card/ and /api/track/Friday, June 24, 2011

CREATE A CARD

Friday, June 24, 2011

WHAT ABOUT TRACKS?

Default post_list from resources.py (create object via POST)Friday, June 24, 2011

WHAT ABOUT TRACKS?

api.py post_list (override method)Friday, June 24, 2011

MOBILE WANTS HIERARCHICAL DATA

Friday, June 24, 2011

TASTYPIE MAKES IT EASY

Friday, June 24, 2011

AUTHENTICATION & AUTHORIZATION

Authentication - let the user in the door Authorization - what the user can seeFriday, June 24, 2011

LIMITING BY USER

Returns only the objects owned by the current user.

Friday, June 24, 2011

ERROR CODESIdeally your API should:

Never return HTML Tailor response codes to actions on device Return messages designed for the end user Dont forget the App Store Never, ever return HTMLFriday, June 24, 2011

TAILOR ERROR CODES TO ACTIONS ON DEVICEcode 200 or 201 = success code -10 = show alert; include user message code -20 = show type x alert; log message code -30 = don't alert user, but send certain info to the server code -40 = try again code -50 = push a web view and point it to this url

(a very simple example)Friday, June 24, 2011

JSON ERROR RESPONSES

override wrap_view from resources.pyFriday, June 24, 2011

JSON ERROR HANDLING

Objective-C in XcodeFriday, June 24, 2011

http://www.youtube.com/watch?v=maZxd8K7Tjc

Friday, June 24, 2011

ACCEPT ARRAYS OF DATA User User User User

enters tunnel uses your app closesyour app exits tunnel

Friday, June 24, 2011

ACCEPT ARRAYS OF DATA{ "pointevents": [ { "datetime":"2011-06-19 14:33:02", "level":"1", "points":"92" } ], "awards": [ { "datetime":"2011-06-19 14:29:44", "award":"12", } ] }

Friday, June 24, 2011

PRE-CALCULATED DATA OR DATA NOT STORED ON DEVICE No

other users are stored on device or other calculated user data must come from the server

Leaderboards

Friday, June 24, 2011

TWITTER LEADERBOARD Compete

with your friends shows daily statistics

Leaderboard Best

returned json for mobile:

[array of users containing username and [array of days containing num tweets, mentions, etc] ]

Friday, June 24, 2011

LEADERBOARD JSON

Friday, June 24, 2011

WHEN THIS DOESNT APPLY Large

data sets -- only expose what client needs third-party clients client to set depth level a few special expected api calls

Multiple

Allow

Create

api/card/?depth=1 or send in json package, or send in the accept headerFriday, June 24, 2011

THANK YOU! Music

Hack Day Accomplices: Matt Katz, Alexandre Passant, Jeff Novich, Twom Deryckere (Daniel Lindsley) - TastyPie

Danielzilla IsaacKelly

DjangoCon

Friday, June 24, 2011

VALENTUNES Music

Hack Day: http://nyc.musichackday.org/ (Django code) https://github.com/natea/valentunes (iPhone code) https://github.com/jazztpt/Valentunes_iPhone (Twilio integration) https://github.com/terraces/valentunes-twilio

Valentunes

Valentunes

Valentunes

Friday, June 24, 2011

DJANGO API FRAMEWORKS TastyPie

documentation (the one we used) http://readthedocs.org/docs/django-tastypie/en/latest/ https://bitbucket.org/jespern/django-piston/ REST framework http://django-rest-framework.org

django-piston

Django

Friday, June 24, 2011

QUESTIONS? Blog

post with more detail on mobile api design: http://www.annacallahan.com/blog/2011/06/24/mobile-apidesign/ Callahan: annacallahan.com @jazztpt djangozoom.com @natea

Anna

Nate Aune:

Friday, June 24, 2011