Rails - Nov 2010 - webservice - get client ip address

Hi
I have the following problem in my application I have
in the controller:

class XmlrpcController < ApplicationController
    web_service_dispatching_mode :layered
    wsdl_service_name ''weblogUpdates.ping''
    web_service_scaffold :invoke
    web_service :weblogUpdates, WeblogUpdates.new
end

in the api definition file:
-------
class WeblogUpdatesApi < ActionWebService::API::Base
    inflect_names false

    api_method :ping, :expects => [{:sitename=>:string},
{:url=>:string}], :returns => [XmlrpcStructs::PingInfo]
end
-------

class WeblogUpdates < ActionWebService::Base
  web_service_api WeblogUpdatesApi
  def ping(sitename, url)
     # a logic here
     ....
     return XmlrpcStructs::PingInfo.new(:flerror => flerror, :message
=> message)
 end
end
------

Everything works here
Now in my ping method I would like to use a request object
How can I pass a request from the controller to ping method
in WeblogUpdates class

I''m new to ruby on rails
If I posted this to the wrong group sorry and please direct me to the
right one

Thanks
simon

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