From: Jason Wold <jason.wold@...>
Date: 2004-04-25T04:16:25+09:00
Subject: Re: Playing with sockets...

Here is something I ripped out of some code I am working on.
require 'socket'
require 'thread'

PORT=4033

io = Proc.new{ TCPServer.new('localhost', PORT).accept }
#io = Proc.new { IO.new(1) }

mutex = Mutex.new

threads =[]
cmd_buffer = []
threads << Thread.new do
  cmd = ""
  puts "Started thread" if $DEBUG
  # call the proc object that creates the io object
  f = io.call
  while ! cmd.match(/^quit|q/i)
    f.print "HA>"
    f.flush
    cmd = f.readline.chomp
    next if cmd.empty?
    puts "Got command #{cmd}" if $DEBUG
    (f.close; next) if cmd.match(/^(quit|q)$/i)
    # lock access to cmd_buffer since another thread will
    # be reading it
    mutex.synchronize {cmd_buffer << cmd }
  end
end

threads.each { |t| t.join }

__END__

On the server:
===========
$ ruby -d test
Started thread


On the client:
===========
$ telnet ital.jasonandvivian.net 4033
Trying 192.168.168.20...
Connected to ital.
Escape character is '^]'.
HA>testing
HA>this is a test
HA>quit
Connection closed by foreign host.

On the server:
===========
Got command testing
Got command this is a test
Got command quit

> 
> I wonder: How hard is it to write a server to which one would connect
> with telnet?
> 
> Hal
> 
>