Using the em-http gem with WebSockets

Saturday, 10 July 2010 16:34

EventMachine based HTTP Request interface. Supports streaming response processing / based on Zed Shaw's Ragel HTTP
parser.

*installation*


gem1.9.1 install em-http-request



Building native extensions.  This could take a while...

Successfully installed em-http-request-0.2.10

1 gem installed

Installing ri documentation for em-http-request-0.2.10...

Updating class cache with 2603 classes...

Installing RDoc documentation for em-http-request-0.2.10...

*testing the client*

1) Launch the websocket server. This example uses the rcscript job 'multicast' e.g.


alias mul="rcscript //job:multicast http://rorbuilder.info/r/websocket.rsf"

mul drobertson secret

2) Execute the code below from an irb session.



require 'em-http'

 

EventMachine.run {

  http = EventMachine::HttpRequest.new("ws://localhost:8080/").get :timeout => 0

 

  http.errback { puts "oops" }

  http.callback {

    puts "WebSocket connected!"

    http.send("Hello client")

  }

 

  http.stream { |msg|

    puts "Received: #{msg}"

    #http.send "Pong: #{msg}"

  }

}

3) Observe the received messages in from the irb session e.g.


WebSocket connected!

Recieved: 2 connected!

Recieved: <2>: Hello client

Recieved: jubs_pie: @ViniSaporta HMMMMMMMMMM ME JOGA NA CAMA E ME CHAMA DE RUBY MEU BEM n

Recieved: retrodin: Newbie Questions - Ruby, Pearl, Mits, Please have some patience with me as I am a newbie and don't understand much of the technical jargon

Recieved: agebackwards: Model ex at centre of Ruby break-up - http://www.newzfor.me/?4crd

Resources:
- igrigorik's em-http-request at master [github.com]
- Ruby & WebSockets: TCP for the Browser [igvita.com]

*update: 10-Jul-2010 @ 7:29pm*

Here's the Rcscript job alias:

alias mcl="rcscript //job:multicast_client http://rorbuilder.info/r/websocket.rsf"