Rails - Nov 2011 - access requesting IP from actionwebservice controller/model

I''m building a SOAP server for a rails project we have here.
I''m using actionwebservice to achieve this.

Inside the logic for one of the SOAP methods I need to read 
the IP address of the requesting client.

For a regular rails controller we''ve been using this 
construct, which works nicely
--------------------------------------------
tmp_ip = request.env["HTTP_X_FORWARDED_FOR"]
    if(tmp_ip =~ /(\d+\.\d+\.\d+\.\d+)$/)
      tmp_ip = $1;
    else
      tmp_ip = request.remote_ip
end
--------------------------------------------

But if I put that in either my webservice method or my webservice
controller I just get this error: "undefined local variable or
method `request'' for PsipredApiController:Class"

Here''s the controller:
--------------------------------------
class PsipredApiController < ApplicationController
 web_service_dispatching_mode :delegated

  @tmp_ip = request.env["HTTP_X_FORWARDED_FOR"]
    if(@tmp_ip =~ /(\d+\.\d+\.\d+\.\d+)$/)
      @tmp_ip = $1;
    else
      @tmp_ip = request.remote_ip
 end

  web_service :api_disopred, ApiDisopredService.new
 web_service_scaffold :invoke
end
--------------------------------------

Here''s the API defs
-------------------------------------
class ApiDisopred < ActionWebService::API::Base

  api_method :submit, :expects =>   [{:sequence=>:string}, 
{:email=>:string},{:name=>:string}, {:fpr => :string}, {:psiblast =>
:string},
{:psipred => :string}], :returns => [SubmitMessage]

  api_method :results, :expects =>   [{:job_id=>:string}], :returns =>
[:string]

end
-------------------------------------

and here''s the methods
-------------------------------------
class ApiDisopredService < ActionWebService::Base
 web_service_api ApiDisopred

def submit(sequence, email, name, fpr, psiblast, psipred)
 [A GREAT DEAL OF LOGIC THAT WORKS]
    results = SubmitMessage.new
    results.message = @message
    results.job_id = @job.id
    results.state = @state
    return results
end

end
---------------------------------------

I hope someone can suggest a fix.

Thanks,
Daniel


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