From: Alexandr Vladykin <moscower@...>
Date: 2004-03-20T04:06:50+09:00
Subject: Server on Ruby

Hello, all!

I have joined to this mailing list just now, and I am
newbie in Ruby. So, sorry, if my question seemed as very
easy, but I can not solve it. Please help me, if possible.

Before Ruby I have programmed on Perl, but in some reasons
I was have to go to the Ruby. And I have to write a socket
server on Ruby. Because I have some examples on Perl, I
decided to translate it to Ruby for meeting, how it can be
done on Ruby. 

So, I have a simply echo socket server on Perl:

---------------------------------------------------------------------------------------------------------------
#!/usr/bin/perl -wT
require 5.002;
use strict;
use IO::Socket;
use IO::Select;

# create a socket to listen to a port
my $listen = IO::Socket::INET->new(Proto => 'tcp',
				   LocalPort => 2324,
				   Listen => 1,
				   Reuse => 1) or die $!;

# to start with, $select contains only the socket we're
listening on
my $select = IO::Select->new($listen);

my @ready;

# wait until there's something to do 
while(@ready = $select->can_read) {

    my $socket;

    # handle each socket that's ready
    for $socket (@ready) {

	# if the listening socket is ready, accept a new
connection
	if($socket == $listen) {
	    my $new = $listen->accept;
	    $select->add($new);
	    print $new->fileno . ": connected\n";
	} else {

	    # otherwise, read a line of text and send it back
again
	    my $line="";
	    $socket->recv($line,80);
	    $line ne "" and $socket->send($line) or do {

		# either can't send or can't receive, so they must have
hung up
		print $socket->fileno . ": disconnected\n";
		$select->remove($socket);
		$socket->close;
	    };
	}
    }
}

---------------------------------------------------------------------------------------------------------------

I tryed to translate it into Ruby, but I did not find in
Ruby any objects as Perl IO::Select, so
how I can handle multiple clients on Ruby as Perl do it
with IO::Select?

May be there are some any additional documentation about
writing socket servers on Ruby? 

Please, help me.

Best regards,
Alexandr Vladykin
<moscower@smtp.ru>