Full-duplex cloud app with WebSocket

@luka_bernardi Luca Bernardi

“Everything goes through an API, 
 we are functioning 
 with cloud app” “Mobile is not Different” https://vimeo.com/61044805

Document vs. Stream Paradigms

Document Paradigm Built around request/response 
 paradigm of HTTP

Stream Paradigm Instantly update your content as things happens

What we are going to build

Hey, what about old good BSD socket?

“No App is an island” Not suitable for web applications

Abstraction Wouldn’t be nice to have an 
 event-based layer of abstraction?

Abusing HTTP Polling Long Polling Streaming

Meet WebSocket ! Independent TCP-based protocol that enables bidirectional, message-oriented streaming of text and binary data between client and server.

Server side [JS/Node.js] Socket.io (http://socket.io) [Python] Tornado (http:// www.tornadoweb.org) [Ruby] em-websocket (https:// github.com/igrigorik/em-websocket) [Objective-C] RockemSockem (https:// github.com/joshaber/RockemSockem) http://www.pusher.com http://www.pubnub.com https://www.hydna.com Comprehensive of realtime web technologies: https://github.com/leggetter/realtime-web-technologies-guide/blob/master/guide.md Self-Hosted Hosted

Socket.io Socket.io > WebSocket Abstract the transport mechanism

Event/Message based

Heartbeat By sending a heartbeat at a predetermined interval the client informs the server 
 that it's still there.

Rooms Partitioning of the connected clients.

Show us some code!

Server Code

Client libraries AZSocketIO (https://github.com/pashields/AZSocketIO) Socket.IO-objc (https://github.com/pkyeck/socket.IO-objc)

Client Code

Use Case Chat / Messaging Real-time geolocation Stream of event/news Real-time collaboration Games

Think different your API Photo by Héctor García (http://www.flickr.com/photos/torek/7109339349/)

Question?