From: Victor Reyes <victor.reyes@...>
Date: 2008-05-29T04:08:39+09:00
Subject: Re: GServer send/receive limit

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On Wed, May 28, 2008 at 1:31 PM, Eleanor McHugh <
eleanor@games-with-brains.com> wrote:

> On 28 May 2008, at 18:13, Victor Reyes wrote:
>
>> Is there a limit on the amount of data transmitted via GServer?
>> I am playing some code snipped found on the web, which I changed to send
>> the
>> output of a command from the server to the client.
>> However, I have not been able to receive more than a few bytes, less than
>> 100 bytes.
>> So I was wondering if there were a limit for send/receive under GServer. I
>> could not find such limits on the rdoc.
>>
>
> I've never noticed a limit when I've been experimenting. Care to post a
> code snippet showing what you're actually doing?
>
>
> Ellie
>
> Eleanor McHugh
> Games With Brains
> http://slides.games-with-brains.net
> ----
> raise ArgumentError unless @reality.responds_to? :reason
>
>
>
Well, as I said earlier, I found these pieces of code in a website named
games-with-brains.com, which I think you have something to do with it, and
perhaps it has your picture.
It looks like some nice pieces of code, which I've been trying to make it
work for me so I can incorporate it's functionality on my script. I am
specifically interested in the way your code establish the connection and
keeps it.
Today I use TCP on a simple client/server (The client issues a request to a
remote server, which is listening on a port. The server processes the
request and sends the outcome back to the client).

However my new requirements include the need for the client/server to
exchange some handshaking. Once the initial handshaking is done, the server
will process the requested operation and returns any output to the client.
The code I found on the web is able to establish and keep the connection for
what I can see. The problem is that the client only receives 1 line of data.
I played a bit displaying the data on the server side prior to sending it to
the client and it looks good. But, pardon the repetition, the client only
gets 1 line.
The host file which I am using as my scape goat to send it across is
actually about 300 lines.

Attached is the code I lifted from the website:

*THE CLIENT
cat gc22.rb
#!/usr/local/ruby-1.8.6/bin/ruby -W0
require 'tcpc.rb'

class TimeClient < TCPClient
        def send
                message = "#{Time.now}"
                puts "sending message: #{message}"
                super message
        end

        def on_response
                line = receive
                print "#{line}"
        end
end


client = TimeClient.new
(1..2).each do |i|
        client.connect("localhost", 12341955)
        client.send
        client.on_response
        puts "=========="
        client.disconnect
        sleep 3
end


THE SERVER:
cat gs2.rb
#!/usr/local/ruby-1.8.6/bin/ruby -W0
require 'gserver'
class TestServer < GServer
def serve( io )
        begin
                io.puts ">> WELCOME <<"
                loop do
                begin
                      telnet_input = io.gets
                      puts "The input: #{telnet_input}"
                      break if telnet_input =~ /\Aquit\b/
                      cmd = `cat /etc/hosts`

                      io.puts cmd

                      if telnet_input.chomp.include? "shutdown"
                         self.stop
                      end
                      io.puts eval(telnet_input)
                rescue Exception
                      io.puts "Oops - " + $!
            end
                log "Rec'd " + telnet_input
           end
         io.puts ">> GOODBYE <<"
         io.close
        rescue Exception
            puts "OOPS - " + $!
            raise
          end
        end
end
ts = TestServer.new 12341955
ts.start
ts.audit = true
ts.join

THE GLUE THAT KEEPS EVERYTHING TOGETHER, I THINK. Although I don't
understand it well.
cat tcpc.rb
#!/usr/local/ruby-1.8.6/bin/ruby -W0
require 'socket'

EndPoint = Struct.new(:host, :port)

class TCPClient
        attr_reader :remote, :status

        def connect remote_host, remote_port
                raise if @socket
                puts "starting client"
                @remote = EndPoint.new(remote_host, remote_port)
                @socket = TCPSocket.new(@remote.host, @remote.port)
        end

        def send message
                @socket.puts(message)
                on_response
        end

        def on_response; end

        def receive
                raise unless @socket
                begin
                        response = @socket.gets
                end until response
                response
        end

        def disconnect
                @socket.close
                @socket = nil
        end
end

===============================
SAMPLE SESSION
gs2.rb
[Wed May 28 15:04:42 2008] TestServer 127.0.0.1:21187 client:38691 loopback<
127.0.0.1> connect
The input: Wed May 28 15:04:42 -0400 2008
OOPS - Broken pipe
[Wed May 28 15:04:42 2008] TestServer 127.0.0.1:21187 client:38691
disconnect
[Wed May 28 15:04:45 2008] TestServer 127.0.0.1:21187 client:38692 loopback<
127.0.0.1> connect
The input: Wed May 28 15:04:45 -0400 2008
[Wed May 28 15:04:45 2008] Rec'd Wed May 28 15:04:45 -0400 2008
The input:
OOPS - Broken pipe
[Wed May 28 15:04:45 2008] TestServer 127.0.0.1:21187 client:38692
disconnect
=================================
gc22.rb
starting client
sending message: Wed May 28 15:04:42 -0400 2008
>> WELCOME <<
127.0.0.1       loopback localhost      # loopback (lo0) name/address
==========
starting client
sending message: Wed May 28 15:04:45 -0400 2008
>> WELCOME <<
127.0.0.1       loopback localhost      # loopback (lo0) name/address
==========
*

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