From: Matthew PATTISON <mfp@...>
Date: 2002-03-26T23:39:58+09:00
Subject: Problems with sockets: connecting a bot to Unreal Tournament

Hi,

I'm trying to create a bot (computer controlled character) for Unreal 
Tournament which needs to connect to the game via a socket interface. I haven't
used sockets before and I'm running into some problems. I have some tcl example
code which does what I want, but the equivalent code in Ruby (as I write it)
doesn't seem to work:

tcl:
 
  set s [socket "localhost" 3000]
	
  gets $s line
  puts stdout $line
	
  set line "init \{name TclBot\} \{team 255\}"
  puts $s $line
  flush $s
  puts stdout $line
	
  gets $s line
  puts stdout $line

this outputs:

NFO {Gametype BotDomination} {Level DOM-Stalwart} {GoalTeamScore 100.000000} {Ti
meLimit 0} {MaxTeams 2} {MaxTeamSize 16}
init {name TclBot} {team 255}
VMS {String Yigal entered the game.}

which is what I want.

in Ruby (1.6.6 single step installer in Windows 2000)

require 'socket'

  s = TCPSocket.new('localhost', 3000)
  data = s.recv(150)
  #data = s.gets
  puts data
  str = 'init {name RubyBot} {team 255}'
  s.send(str,Socket:MSG_OOB) #I've also tried Socket::MSG_DONTROUTE and 0
  s.flush
  puts str

  if select([s],nil, nil, 10) != nil   
      data = s.recv(150)
      #data = s.gets
      puts data
  end

this outputs:

NFO {Gametype BotDomination} {Level DOM-Stalwart} {GoalTeamScore 100.000000} {Ti
meLimit 0} {MaxTeams 2} {MaxTeamSize 16}
init {name RubyBot} {team 255}

which is missing the last line, which is the reply from Unreal Tournament 
acknowledging the bot has joined the game. Without the if select() != nil
around the last recv() call, the ruby script hangs. Also the tcl script
runs almost instantaneously, the ruby script takes a good 20 seconds to
not work properly. I assume there is something stupid I'm doing wrong,
please enlighten me.

Also, in tcl I have:

  fconfigure $s -blocking 0
	
  fileevent $s readable [list Reader $s]

which makes the socket non-blocking and then sets up a callback for the socket.
How do I do this in ruby?

Thanks a lot if someone can help me out.

Matt