Websocket on railsBuilding realtime webapps
I'm a Java Developer who likes to ride the rails!
The future is now!
What's so great about Websocket?
HTTP is half-duplex
Asynchronous full-duplex communicationWebsocket is asynchronous & full-duplex
So, a little less of this...
So instead of this...
Or this...
Or this...
You tell me... what's new?
Push
So, how to ride the rails with this?
Introducing websocket-rails
1. echo "gem 'thin'" >> Gemfile2. echo "gem 'websocket-rails'" >> Gemfile3. bundle install4. rails g websocket_rails:install
Ruby eventmachine
Map events to controller actions
WebsocketRails::EventMap.describe do # You can use this file to map incoming events to controller actions. # One event can be mapped to any number of controller actions. The # actions will be executed in the order they were subscribed. namespace :rsvp do subscribe :new, :to => RsvpController, :with_method => :rsvp endend
Use rails-like controllers
class RsvpController < WebsocketRails::BaseController def initialize_session # initialize application scoped variables here @rsvp_yes_count = 0 end
def rsvp @rsvp_yes_count += 1 if message broadcast_message :new_rsvp, @rsvp_yes_count endend
Trigger and bind to events in the client
$ -> dispatcher = new WebSocketRails('localhost:3000/websocket')
dispatcher.on_open = (data) -> console.log "Connection has been established: #{data}"
$('#rsvp_yes').bind 'click', (message) => dispatcher.trigger 'rsvp.new', true
dispatcher.bind 'new_rsvp', (rsvp_yes_count) => $('#rsvp_yes_count').html rsvp_yes_count
Broadcast to anyone out there, or...
...only push to whom is interested
Use complex messages and channels (1)
class RsvpController < WebsocketRails::BaseController ... def rsvp @rsvp_yes_count += 1 if message[:attending] rsvp = { :yes => @rsvp_yes_count } WebsocketRails[:rsvp].trigger 'new', rsvp endend
Use complex messages and channels (2)
$ -> dispatcher = new WebSocketRails('localhost:3000/websocket')
$('#rsvp_yes').bind 'click', (message) => rsvp = attending: true dispatcher.trigger 'rsvp.new', rsvp
channel = dispatcher.subscribe 'rsvp' channel.bind 'new', (rsvp) => $('#rsvp_yes_count').html rsvp.yes
Dem
o
References
Websocket spec● http://dev.w3.org/html5/websockets/
Websocket-rails project page● http://danknox.github.com/websocket-rails/
My project● https://github.com/jeroenr/followup
Ruby eventmachine● http://rubyeventmachine.com/
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