shogi_server/command.rb

   1 ## $Id$
   2
   3 ## Copyright (C) 2004 NABEYA Kenichi (aka nanami@2ch)
   4 ## Copyright (C) 2007-2008 Daigo Moriwaki (daigo at debian dot org)
   5 ##
   6 ## This program is free software; you can redistribute it and/or modify
   7 ## it under the terms of the GNU General Public License as published by
   8 ## the Free Software Foundation; either version 2 of the License, or
   9 ## (at your option) any later version.
  10 ##
  11 ## This program is distributed in the hope that it will be useful,
  12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ## GNU General Public License for more details.
  15 ##
  16 ## You should have received a copy of the GNU General Public License
  17 ## along with this program; if not, write to the Free Software
  18 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19
  20 require 'kconv'
  21 require 'shogi_server'
  22
  23 module ShogiServer
  24
  25   class Command
  26     # Factory method
  27     #
  28     def Command.factory(str, player, time=Time.now)
  29       cmd = nil
  30       case str
  31       when ""
  32         cmd = KeepAliveCommand.new(str, player)
  33       when /^[\+\-][^%]/
  34         cmd = MoveCommand.new(str, player)
  35       when /^%[^%]/, :timeout
  36         cmd = SpecialCommand.new(str, player)
  37       when :exception
  38         cmd = ExceptionCommand.new(str, player)
  39       when /^REJECT/
  40         cmd = RejectCommand.new(str, player)
  41       when /^AGREE/
  42         cmd = AgreeCommand.new(str, player)
  43       when /^%%SHOW\s+(\S+)/
  44         game_id = $1
  45         cmd = ShowCommand.new(str, player, $league.games[game_id])
  46       when /^%%MONITORON\s+(\S+)/
  47         game_id = $1
  48         cmd = MonitorOnCommand.new(str, player, $league.games[game_id])
  49       when /^%%MONITOROFF\s+(\S+)/
  50         game_id = $1
  51         cmd = MonitorOffCommand.new(str, player, $league.games[game_id])
  52       when /^%%MONITOR2ON\s+(\S+)/
  53         game_id = $1
  54         cmd = Monitor2OnCommand.new(str, player, $league.games[game_id])
  55       when /^%%MONITOR2OFF\s+(\S+)/
  56         game_id = $1
  57         cmd = Monitor2OffCommand.new(str, player, $league.games[game_id])
  58       when /^%%HELP/
  59         cmd = HelpCommand.new(str, player)
  60       when /^%%RATING/
  61         cmd = RatingCommand.new(str, player, $league.rated_players)
  62       when /^%%VERSION/
  63         cmd = VersionCommand.new(str, player)
  64       when /^%%GAME\s*$/
  65         cmd = GameCommand.new(str, player)
  66       when /^%%(GAME|CHALLENGE)\s+(\S+)\s+([\+\-\*])\s*$/
  67         command_name = $1
  68         game_name = $2
  69         my_sente_str = $3
  70         cmd = GameChallengeCommand.new(str, player,
  71                                        command_name, game_name, my_sente_str)
  72       when /^%%CHAT\s+(.+)/
  73         message = $1
  74         cmd = ChatCommand.new(str, player, message, $league.players)
  75       when /^%%LIST/
  76         cmd = ListCommand.new(str, player, $league.games)
  77       when /^%%WHO/
  78         cmd = WhoCommand.new(str, player, $league.players)
  79       when /^LOGOUT/
  80         cmd = LogoutCommand.new(str, player)
  81       when /^CHALLENGE/
  82         cmd = ChallengeCommand.new(str, player)
  83       when /^%%SETBUOY\s+(\S+)\s+(\S+)(.*)/
  84         game_name = $1
  85         moves     = $2
  86         count = 1 # default
  87         if $3 && /^\s+(\d*)/ =~ $3
  88           count = $1.to_i
  89         end
  90         cmd = SetBuoyCommand.new(str, player, game_name, moves, count)
  91       when /^%%DELETEBUOY\s+(\S+)/
  92         game_name = $1
  93         cmd = DeleteBuoyCommand.new(str, player, game_name)
  94       when /^%%GETBUOYCOUNT\s+(\S+)/
  95         game_name = $1
  96         cmd = GetBuoyCountCommand.new(str, player, game_name)
  97       when /^\s*$/
  98         cmd = SpaceCommand.new(str, player)
  99       when /^%%%[^%]/
 100         # TODO: just ignore commands specific to 81Dojo.
 101         # Need to discuss with 81Dojo people.
 102         cmd = VoidCommand.new(str, player)
 103       else
 104         cmd = ErrorCommand.new(str, player)
 105       end
 106
 107       cmd.time = time
 108       return cmd
 109     end
 110
 111     def initialize(str, player)
 112       @str    = str
 113       @player = player
 114       @time   = Time.now # this should be replaced later with a real time
 115     end
 116     attr_accessor :time
 117   end
 118
 119   # Dummy command which does nothing.
 120   #
 121   class VoidCommand < Command
 122     def initialize(str, player)
 123       super
 124     end
 125
 126     def call
 127       return :continue
 128     end
 129   end
 130
 131   # Application-level protocol for Keep-Alive.
 132   # If the server receives an LF, it sends back an LF.  Note that the 30 sec
 133   # rule (client may not send LF again within 30 sec) is not implemented
 134   # yet.
 135   #
 136   class KeepAliveCommand < Command
 137     def initialize(str, player)
 138       super
 139     end
 140
 141     def call
 142       @player.write_safe("\n")
 143       return :continue
 144     end
 145   end
 146
 147   # Command of moving a piece.
 148   #
 149   class MoveCommand < Command
 150     def initialize(str, player)
 151       super
 152     end
 153
 154     def call
 155       if (@player.status == "game")
 156         array_str = @str.split(",")
 157         move = array_str.shift
 158         if @player.game.last_move &&
 159            @player.game.last_move.split(",").first == move
 160           log_warning("Received two sequencial identical moves [#{move}] from #{@player.name}. The last one was ignored.")
 161           return :continue
 162         end
 163         additional = array_str.shift
 164         comment = nil
 165         if /^'(.*)/ =~ additional
 166           comment = array_str.unshift("'*#{$1.toeuc}")
 167         end
 168         s = @player.game.handle_one_move(move, @player, @time)
 169         @player.game.log_game(Kconv.toeuc(comment.first)) if (comment && comment.first && !s)
 170         return :return if (s && @player.protocol == LoginCSA::PROTOCOL)
 171       end
 172       return :continue
 173     end
 174   end
 175
 176   # Command like "%TORYO" or :timeout
 177   #
 178   class SpecialCommand < Command
 179     def initialize(str, player)
 180       super
 181     end
 182
 183     def call
 184       rc = :continue
 185       if (@player.status == "game")
 186         rc = in_game_status()
 187       elsif ["agree_waiting", "start_waiting"].include?(@player.status)
 188         rc = in_waiting_status()
 189       else
 190         log_error("Received a command [#{@str}] from #{@player.name} in an inappropriate status [#{@player.status}].") unless @str == :timeout
 191       end
 192       return rc
 193     end
 194
 195     def in_game_status
 196       rc = :continue
 197
 198       s = @player.game.handle_one_move(@str, @player, @time)
 199       rc = :return if (s && @player.protocol == LoginCSA::PROTOCOL)
 200
 201       return rc
 202     end
 203
 204     def in_waiting_status
 205       rc = :continue
 206
 207       if @player.game.prepared_expire?
 208         log_warning("#{@player.status} lasted too long. This play has been expired: %s" % [@player.game.game_id])
 209         @player.game.reject("the Server (timed out)")
 210         rc = :return if (@player.protocol == LoginCSA::PROTOCOL)
 211       end
 212
 213       return rc
 214     end
 215   end
 216
 217   # Command of :exception
 218   #
 219   class ExceptionCommand < Command
 220     def initialize(str, player)
 221       super
 222     end
 223
 224     def call
 225       log_error("Failed to receive a message from #{@player.name}.")
 226       return :return
 227     end
 228   end
 229
 230   # Command of REJECT
 231   #
 232   class RejectCommand < Command
 233     def initialize(str, player)
 234       super
 235     end
 236
 237     def call
 238       if (@player.status == "agree_waiting")
 239         @player.game.reject(@player.name)
 240         return :return if (@player.protocol == LoginCSA::PROTOCOL)
 241       else
 242         log_error("Received a command [#{@str}] from #{@player.name} in an inappropriate status [#{@player.status}].")
 243         @player.write_safe(sprintf("##[ERROR] you are in %s status. REJECT is valid in agree_waiting status\n", @player.status))
 244       end
 245       return :continue
 246     end
 247   end
 248
 249   # Command of AGREE
 250   #
 251   class AgreeCommand < Command
 252     def initialize(str, player)
 253       super
 254     end
 255
 256     def call
 257       if (@player.status == "agree_waiting")
 258         @player.status = "start_waiting"
 259         if (@player.game.is_startable_status?)
 260           @player.game.start
 261         end
 262       else
 263         log_error("Received a command [#{@str}] from #{@player.name} in an inappropriate status [#{@player.status}].")
 264         @player.write_safe(sprintf("##[ERROR] you are in %s status. AGREE is valid in agree_waiting status\n", @player.status))
 265       end
 266       return :continue
 267     end
 268   end
 269
 270   # Base Command calss requiring a game instance
 271   #
 272   class BaseCommandForGame < Command
 273     def initialize(str, player, game)
 274       super(str, player)
 275       @game    = game
 276       @game_id = game ? game.game_id : nil
 277     end
 278   end
 279
 280   # Command of SHOW
 281   #
 282   class ShowCommand < BaseCommandForGame
 283     def initialize(str, player, game)
 284       super
 285     end
 286
 287     def call
 288       if (@game)
 289         @player.write_safe(@game.show.gsub(/^/, '##[SHOW] '))
 290       end
 291       @player.write_safe("##[SHOW] +OK\n")
 292       return :continue
 293     end
 294   end
 295
 296   class MonitorHandler
 297     def initialize(player)
 298       @player = player
 299       @type = nil
 300       @header = nil
 301     end
 302     attr_reader :player, :type, :header
 303
 304     def ==(rhs)
 305       return rhs != nil &&
 306              rhs.is_a?(MonitorHandler) &&
 307              @player == rhs.player &&
 308              @type   == rhs.type
 309     end
 310
 311     def write_safe(game_id, str)
 312       str.chomp.split("\n").each do |line|
 313         @player.write_safe("##[%s][%s] %s\n" % [@header, game_id, line.chomp])
 314       end
 315       @player.write_safe("##[%s][%s] %s\n" % [@header, game_id, "+OK"])
 316     end
 317   end
 318
 319   class MonitorHandler1 < MonitorHandler
 320     def initialize(player)
 321       super
 322       @type = 1
 323       @header = "MONITOR"
 324     end
 325
 326     def write_one_move(game_id, game)
 327       write_safe(game_id, game.show.chomp)
 328     end
 329   end
 330
 331   class MonitorHandler2 < MonitorHandler
 332     def initialize(player)
 333       super
 334       @type = 2
 335       @header = "MONITOR2"
 336     end
 337
 338     def write_one_move(game_id, game)
 339       write_safe(game_id, game.last_move.gsub(",", "\n"))
 340     end
 341   end
 342
 343   # Command of MONITORON
 344   #
 345   class MonitorOnCommand < BaseCommandForGame
 346     def initialize(str, player, game)
 347       super
 348     end
 349
 350     def call
 351       if (@game)
 352         monitor_handler = MonitorHandler1.new(@player)
 353         @game.monitoron(monitor_handler)
 354         monitor_handler.write_safe(@game_id, @game.show)
 355       end
 356       return :continue
 357     end
 358   end
 359
 360   # Command of MONITOROFF
 361   #
 362   class MonitorOffCommand < BaseCommandForGame
 363     def initialize(str, player, game)
 364       super
 365     end
 366
 367     def call
 368       if (@game)
 369         @game.monitoroff(MonitorHandler1.new(@player))
 370       end
 371       return :continue
 372     end
 373   end
 374
 375   # Command of MONITOR2ON
 376   #
 377   class Monitor2OnCommand < BaseCommandForGame
 378     def initialize(str, player, game)
 379       super
 380     end
 381
 382     def call
 383       if (@game)
 384         monitor_handler = MonitorHandler2.new(@player)
 385         @game.monitoron(monitor_handler)
 386         lines = IO::readlines(@game.logfile).join("")
 387         monitor_handler.write_safe(@game_id, lines)
 388       end
 389       return :continue
 390     end
 391   end
 392
 393   class Monitor2OffCommand < MonitorOffCommand
 394     def initialize(str, player, game)
 395       super
 396     end
 397
 398     def call
 399       if (@game)
 400         @game.monitoroff(MonitorHandler2.new(@player))
 401       end
 402       return :continue
 403     end
 404   end
 405
 406   # Command of HELP
 407   #
 408   class HelpCommand < Command
 409     def initialize(str, player)
 410       super
 411     end
 412
 413     def call
 414       @player.write_safe(
 415         %!##[HELP] available commands "%%WHO", "%%CHAT str", "%%GAME game_name +", "%%GAME game_name -"\n!)
 416       return :continue
 417     end
 418   end
 419
 420   # Command of RATING
 421   #
 422   class RatingCommand < Command
 423     def initialize(str, player, rated_players)
 424       super(str, player)
 425       @rated_players = rated_players
 426     end
 427
 428     def call
 429       @rated_players.sort {|a,b| b.rate <=> a.rate}.each do |p|
 430         @player.write_safe("##[RATING] %s \t %4d @%s\n" %
 431                    [p.simple_player_id, p.rate, p.modified_at.strftime("%Y-%m-%d")])
 432       end
 433       @player.write_safe("##[RATING] +OK\n")
 434       return :continue
 435     end
 436   end
 437
 438   # Command of VERSION
 439   #
 440   class VersionCommand < Command
 441     def initialize(str, player)
 442       super
 443     end
 444
 445     def call
 446       @player.write_safe "##[VERSION] Shogi Server revision #{ShogiServer::Revision}\n"
 447       @player.write_safe("##[VERSION] +OK\n")
 448       return :continue
 449     end
 450   end
 451
 452   # Command of GAME
 453   #
 454   class GameCommand < Command
 455     def initialize(str, player)
 456       super
 457     end
 458
 459     def call
 460       if ((@player.status == "connected") || (@player.status == "game_waiting"))
 461         @player.status = "connected"
 462         @player.game_name = ""
 463       else
 464         @player.write_safe(sprintf("##[ERROR] you are in %s status. GAME is valid in connected or game_waiting status\n", @player.status))
 465       end
 466       return :continue
 467     end
 468   end
 469
 470   # Commando of game challenge
 471   # TODO make a test case
 472   #
 473   class GameChallengeCommand < Command
 474     def initialize(str, player, command_name, game_name, my_sente_str)
 475       super(str, player)
 476       @command_name = command_name
 477       @game_name    = game_name
 478       @my_sente_str = my_sente_str
 479       player.set_sente_from_str(@my_sente_str)
 480     end
 481
 482     def call
 483       if (! Login::good_game_name?(@game_name))
 484         @player.write_safe(sprintf("##[ERROR] bad game name\n"))
 485         return :continue
 486       elsif ((@player.status == "connected") || (@player.status == "game_waiting"))
 487         ## continue
 488       else
 489         @player.write_safe(sprintf("##[ERROR] you are in %s status. GAME is valid in connected or game_waiting status\n", @player.status))
 490         return :continue
 491       end
 492
 493       rival = nil
 494       if (League::Floodgate.game_name?(@game_name))
 495         if (@my_sente_str != "*")
 496           @player.write_safe(sprintf("##[ERROR] You are not allowed to specify TEBAN %s for the game %s\n", @my_sente_str, @game_name))
 497           return :continue
 498         end
 499         @player.sente = nil
 500       else
 501         rival = $league.find_rival(@player, @game_name)
 502         if rival.instance_of?(Symbol)
 503           # An error happened. rival is not a player instance, but an error
 504           # symobl that must be returned to the main routine immediately.
 505           return rival
 506         end
 507       end
 508
 509       if (rival)
 510         @player.game_name = @game_name
 511         Game::decide_turns(@player, @my_sente_str, rival)
 512
 513         if (Buoy.game_name?(@game_name))
 514           buoy = Buoy.new # TODO config
 515           if buoy.is_new_game?(@game_name)
 516             # The buoy game is not ready yet.
 517             # When the game is set, it will be started.
 518             @player.status = "game_waiting"
 519           else
 520             buoy_game = buoy.get_game(@game_name)
 521             if buoy_game.instance_of? NilBuoyGame
 522               # error. never reach
 523             end
 524
 525             moves_array = Board::split_moves(buoy_game.moves)
 526             board = Board.new
 527             begin
 528               board.set_from_moves(moves_array)
 529             rescue => err
 530               # it will never happen since moves have already been checked
 531               log_error "Failed to set up a buoy game: #{moves}"
 532               return :continue
 533             end
 534             buoy.decrement_count(buoy_game)
 535             Game::new(@player.game_name, @player, rival, board)
 536           end
 537         else
 538           klass = Login.handicapped_game_name?(@game_name) || Board
 539           board = klass.new
 540           board.initial
 541           Game::new(@player.game_name, @player, rival, board)
 542         end
 543       else # rival not found
 544         if (@command_name == "GAME")
 545           @player.status = "game_waiting"
 546           @player.game_name = @game_name
 547         else                # challenge
 548           @player.write_safe(sprintf("##[ERROR] can't find rival for %s\n", @game_name))
 549           @player.status = "connected"
 550           @player.game_name = ""
 551           @player.sente = nil
 552         end
 553       end
 554       return :continue
 555     end
 556   end
 557
 558   # Command of CHAT
 559   #
 560   class ChatCommand < Command
 561
 562     # players array of [name, player]
 563     #
 564     def initialize(str, player, message, players)
 565       super(str, player)
 566       @message = message
 567       @players = players
 568     end
 569
 570     def call
 571       @players.each do |name, p| # TODO player change name
 572         if (p.protocol != LoginCSA::PROTOCOL)
 573           p.write_safe(sprintf("##[CHAT][%s] %s\n", @player.name, @message))
 574         end
 575       end
 576       return :continue
 577     end
 578   end
 579
 580   # Command of LIST
 581   #
 582   class ListCommand < Command
 583
 584     # games array of [game_id, game]
 585     #
 586     def initialize(str, player, games)
 587       super(str, player)
 588       @games = games
 589     end
 590
 591     def call
 592       buf = Array::new
 593       @games.each do |id, game|
 594         buf.push(sprintf("##[LIST] %s\n", id))
 595       end
 596       buf.push("##[LIST] +OK\n")
 597       @player.write_safe(buf.join)
 598       return :continue
 599     end
 600   end
 601
 602   # Command of WHO
 603   #
 604   class WhoCommand < Command
 605
 606     # players array of [[name, player]]
 607     #
 608     def initialize(str, player, players)
 609       super(str, player)
 610       @players = players
 611     end
 612
 613     def call
 614       buf = Array::new
 615       @players.each do |name, p|
 616         buf.push(sprintf("##[WHO] %s\n", p.to_s))
 617       end
 618       buf.push("##[WHO] +OK\n")
 619       @player.write_safe(buf.join)
 620       return :continue
 621     end
 622   end
 623
 624   # Command of LOGOUT
 625   #
 626   class LogoutCommand < Command
 627     def initialize(str, player)
 628       super
 629     end
 630
 631     def call
 632       @player.status = "connected"
 633       @player.write_safe("LOGOUT:completed\n")
 634       return :return
 635     end
 636   end
 637
 638   # Command of CHALLENGE
 639   #
 640   class ChallengeCommand < Command
 641     def initialize(str, player)
 642       super
 643     end
 644
 645     def call
 646       # This command is only available for CSA's official testing server.
 647       # So, this means nothing for this program.
 648       @player.write_safe("CHALLENGE ACCEPTED\n")
 649       return :continue
 650     end
 651   end
 652
 653   # Command for a space
 654   #
 655   class SpaceCommand < Command
 656     def initialize(str, player)
 657       super
 658     end
 659
 660     def call
 661       ## ignore null string
 662       return :continue
 663     end
 664   end
 665
 666   # Command for an error
 667   #
 668   class ErrorCommand < Command
 669     def initialize(str, player)
 670       super
 671       @msg = nil
 672     end
 673     attr_reader :msg
 674
 675     def call
 676       cmd = @str.chomp
 677       # Aim to hide a possible password
 678       cmd.gsub!(/LOGIN\s*(\w+)\s+.*/i, 'LOGIN \1...')
 679       @msg = "##[ERROR] unknown command %s\n" % [cmd]
 680       @player.write_safe(@msg)
 681       log_error(@msg)
 682       return :continue
 683     end
 684   end
 685
 686   #
 687   #
 688   class SetBuoyCommand < Command
 689
 690     def initialize(str, player, game_name, moves, count)
 691       super(str, player)
 692       @game_name = game_name
 693       @moves     = moves
 694       @count     = count
 695     end
 696
 697     def call
 698       unless (Buoy.game_name?(@game_name))
 699         @player.write_safe(sprintf("##[ERROR] wrong buoy game name: %s\n", @game_name))
 700         log_error "Received a wrong buoy game name: %s from %s." % [@game_name, @player.name]
 701         return :continue
 702       end
 703       buoy = Buoy.new
 704       unless buoy.is_new_game?(@game_name)
 705         @player.write_safe(sprintf("##[ERROR] duplicated buoy game name: %s\n", @game_name))
 706         log_error "Received duplicated buoy game name: %s from %s." % [@game_name, @player.name]
 707         return :continue
 708       end
 709       if @count < 1
 710         @player.write_safe(sprintf("##[ERROR] invalid count: %s\n", @count))
 711         log_error "Received an invalid count for a buoy game: %s, %s from %s." % [@count, @game_name, @player.name]
 712         return :continue
 713       end
 714
 715       # check moves
 716       moves_array = Board::split_moves(@moves)
 717       board = Board.new
 718       begin
 719         board.set_from_moves(moves_array)
 720       rescue
 721         raise WrongMoves
 722       end
 723
 724       buoy_game = BuoyGame.new(@game_name, @moves, @player.name, @count)
 725       buoy.add_game(buoy_game)
 726       @player.write_safe(sprintf("##[SETBUOY] +OK\n"))
 727       log_info("A buoy game was created: %s by %s" % [@game_name, @player.name])
 728
 729       # if two players are waiting for this buoy game, start it
 730       candidates = $league.find_all_players do |player|
 731         player.status == "game_waiting" &&
 732         player.game_name == @game_name &&
 733         player.name != @player.name
 734       end
 735       if candidates.empty?
 736         log_info("No players found for a buoy game. Wait for players: %s" % [@game_name])
 737         return :continue
 738       end
 739       p1 = candidates.first
 740       p2 = $league.find_rival(p1, @game_name)
 741       if p2.nil?
 742         log_info("No opponent found for a buoy game. Wait for the opponent: %s by %s" % [@game_name, p1.name])
 743         return :continue
 744       elsif p2.instance_of?(Symbol)
 745         # An error happened. rival is not a player instance, but an error
 746         # symobl that must be returned to the main routine immediately.
 747         return p2
 748       end
 749       # found two players: p1 and p2
 750       log_info("Starting a buoy game: %s with %s and %s" % [@game_name, p1.name, p2.name])
 751       buoy.decrement_count(buoy_game)
 752       game = Game::new(@game_name, p1, p2, board)
 753       return :continue
 754
 755     rescue WrongMoves => e
 756       @player.write_safe(sprintf("##[ERROR] wrong moves: %s\n", @moves))
 757       log_error "Received wrong moves: %s from %s. [%s]" % [@moves, @player.name, e.message]
 758       return :continue
 759     end
 760   end
 761
 762   #
 763   #
 764   class DeleteBuoyCommand < Command
 765     def initialize(str, player, game_name)
 766       super(str, player)
 767       @game_name = game_name
 768     end
 769
 770     def call
 771       buoy = Buoy.new
 772       buoy_game = buoy.get_game(@game_name)
 773       if buoy_game.instance_of?(NilBuoyGame)
 774         @player.write_safe(sprintf("##[ERROR] buoy game not found: %s\n", @game_name))
 775         log_error "Game name not found: %s by %s" % [@game_name, @player.name]
 776         return :continue
 777       end
 778
 779       if buoy_game.owner != @player.name
 780         @player.write_safe(sprintf("##[ERROR] you are not allowed to delete a buoy game that you did not set: %s\n", @game_name))
 781         log_error "%s are not allowed to delete a game: %s" % [@player.name, @game_name]
 782         return :continue
 783       end
 784
 785       buoy.delete_game(buoy_game)
 786       @player.write_safe(sprintf("##[DELETEBUOY] +OK\n"))
 787       log_info("A buoy game was deleted: %s" % [@game_name])
 788       return :continue
 789     end
 790   end
 791
 792   #
 793   #
 794   class GetBuoyCountCommand < Command
 795     def initialize(str, player, game_name)
 796       super(str, player)
 797       @game_name = game_name
 798     end
 799
 800     def call
 801       buoy = Buoy.new
 802       buoy_game = buoy.get_game(@game_name)
 803       if buoy_game.instance_of?(NilBuoyGame)
 804         @player.write_safe("##[GETBUOYCOUNT] -1\n")
 805       else
 806         @player.write_safe("##[GETBUOYCOUNT] %s\n" % [buoy_game.count])
 807       end
 808       @player.write_safe("##[GETBUOYCOUNT] +OK\n")
 809       return :continue
 810     end
 811   end
 812
 813 end # module ShogiServer