Introduction to Distributed Ruby

jrobertson (James Robertson) — Sat, 15 Mar 2008 00:59:13 GMT

This code demonstrates a client server architecture. I executed the file simple_service.rb on my Ubuntu server (Donatello - 192.168.1.10), then from the CLI output I copied the server uri into the clipboard. I then executed the simple_client.rb on my Ubuntu desktop (Cryton - 192.168.1.3) while passing in the uri as an argument.



#!/usr/bin/env ruby -w

# simple_service.rb

# A simple DRb service



# load DRb

require 'drb'



# start up the DRb service

DRb.start_service nil, []



# We need the uri of the service to connect a client

puts DRb.uri



# wait for the DRb service to finish before exiting

DRb.thread.join

output: druby://donatello.mydomain.com:47159



#!/usr/bin/env ruby -w

# simple_client.rb

# A simple DRb client



require 'drb'



DRb.start_service



# attach to the DRb server via a URI given on the command line

remote_array = DRbObject.new nil, ARGV.shift



puts remote_array.size



remote_array << 1



puts remote_array.size

from the command line
> ./simple_client.rb druby://192.168.1.10:47159

output:
0
1

Note: I substituted the domain name with the ip address because the name in question was not stored within the DNS settings.

Reference: Introduction to Distributed Ruby (DRb) [segment7.net]

Getting a client's IP address with EventMachine

peter (Peter Cooperx) — Sun, 03 Feb 2008 20:12:09 GMT

This is from, and by: http://nhw.pl/wp/2007/12/07/eventmachine-how-to-get-clients-ip-address/ .. I just wanted a more permanent reference as it's cool code.



EventMachine::run {

   EventMachine::open_datagram_socket $conf[:address],

                                 $conf[:udp_port], CustomServer

}



module CustomServer

   def receive_data d

      pp get_peername[2,6].unpack "nC4"

   end

end

DZone Snippets: sockets code

Introduction to Distributed Ruby

Getting a client's IP address with EventMachine