A Simple Server-Client Chat with dRuby.

client.rb

require "drb/drb"

print "Bitte geben Sie die IP des Servers ein: "
ip = gets.strip
print "Bitte geben Sie den Port des Servers ein: "
port = gets.strip.to_i
port = 3000 if port == 0

server = DRbObject.new_with_uri("druby://#{ ip }:#{ port }")

key = nil
username = ""

while key == nil do
  print "Bitte geben Sie einen Usernamen ein: "
  username = gets.strip
  key = server.register(username)
  puts "Username schon vorhanden." if key == nil
end

Thread.new(server,key) { |s,k|
  loop {
    msgs = s.hear(k)
    msgs.each { |m|
      puts "#{ m[0].hour }:#{ m[0].min }:#{ m[0].sec } | #{ m[1] }: \"#{ m[2] }\""
    }
    sleep 1
  }
}

loop {
  mymsg = ""
  mymsg = gets.strip
  
  unless server.say(key, mymsg) then
    puts "Error: Nachricht konnte nicht gesendet werden."
  end
}

server.rb

require "drb/drb"
require "digest"

class Chatroom
  def initialize(port=3000)
    @users = {}
    @msg = {}
    @server = DRb.start_service("druby://localhost:#{ port.to_i }", self)
    puts "Chatrooroom started at #{ @server.uri }"
    @server.thread.join()
  end
  def register(username)
    # replace whitespaces with _
    username = username.gsub(/\s+/, "_")

    # check if username is free
    return nil if @users.values.include? username

    # generate key
    key = newKey()

    # add user to @users and @msg
    @users[key] = username
    @msg[key]   = []

    # return the key
    return key
  end
  def say(key, msg)
    return false unless @users.keys.include? key
    message = [Time.now, @users[key], "#{ msg }"]
    @msg.each { |k,v|
      if k != key then
        @msg[k] << message
      end
    }
    return true
  end
  def hear(key)
    return nil unless @users.keys.include? key
    msgs = @msg[key]
    @msg[key] = []
    return msgs
  end
  private
  def newKey
    return Digest::MD5.hexdigest Time.now.to_f.to_s
  end
end


port = ARGV[0].to_i
Chatroom.new(port)