From: Justin Collins <justincollins@...>
Date: 2009-05-16T08:07:37+09:00
Subject: Re: EventMachine dynamic port forwarding

Diego Bernardes wrote:
> I need a dynamic port forwarding application, i listem packets from a ip
> on port 10000, then i need not just send the data i receive to other
> ports, but i need first create a connection on this new port first and
> listen to any connection on this port, if i get any thing on this port i
> send back through the first connection.
>
> Its easy to create a single server with EventMachine like the code
> below:
>
> require 'rubygems'
> require 'eventmachine'
>
> module Echo
>   def receive_data data
>     send_data data
>   end
> end
>
> EM.run {
>   EM.start_server "0.0.0.0", 10000, Echo
> }
>
>
> But how could i create another server inside the current server?
>   

Well, you can start as many servers as you would like, but it sounds 
more like you need to open a connection to a server, not start another. 
You can use EventMachine::connect for that.

I believe you can do something like (completely untested):

require 'rubygems'
require 'eventmachine'

module Other
   attr_accessor :sender

   def receive_data data
       self.sender.send_data data
   end
end

module Echo
  def post_init
    @other_side = EM.connect "0.0.0.0", 10001, Other
    @other_side.sender = self
  end

  def receive_data data
    @other_side.send_data data
  end
end

EM.run {
  EM.start_server "0.0.0.0", 10000, Echo
}


-Justin