git.sesse.net Git - remoteglot/blob - remoteglot.pl

   1 #! /usr/bin/perl
   2
   3 #
   4 # remoteglot - Connects an abitrary UCI-speaking engine to ICS for easier post-game
   5 #              analysis, or for live analysis of relayed games. (Do not use for
   6 #              cheating! Cheating is bad for your karma, and your abuser flag.)
   7 #
   8 # Copyright 2007 Steinar H. Gunderson <sgunderson@bigfoot.com>
   9 # Licensed under the GNU General Public License, version 2.
  10 #
  11
  12 use AnyEvent;
  13 use AnyEvent::Handle;
  14 use AnyEvent::HTTP;
  15 use Chess::PGN::Parse;
  16 use EV;
  17 use Net::Telnet;
  18 use FileHandle;
  19 use IPC::Open2;
  20 use Time::HiRes;
  21 use JSON::XS;
  22 use URI::Escape;
  23 require 'Position.pm';
  24 require 'Engine.pm';
  25 require 'config.pm';
  26 use strict;
  27 use warnings;
  28 no warnings qw(once);
  29
  30 # Program starts here
  31 $SIG{ALRM} = sub { output(); };
  32 my $latest_update = undef;
  33 my $http_timer = undef;
  34 my $tb_retry_timer = undef;
  35 my %tb_cache = ();
  36 my $tb_lookup_running = 0;
  37
  38 $| = 1;
  39
  40 open(FICSLOG, ">ficslog.txt")
  41         or die "ficslog.txt: $!";
  42 print FICSLOG "Log starting.\n";
  43 select(FICSLOG);
  44 $| = 1;
  45
  46 open(UCILOG, ">ucilog.txt")
  47         or die "ucilog.txt: $!";
  48 print UCILOG "Log starting.\n";
  49 select(UCILOG);
  50 $| = 1;
  51
  52 open(TBLOG, ">tblog.txt")
  53         or die "tblog.txt: $!";
  54 print TBLOG "Log starting.\n";
  55 select(TBLOG);
  56 $| = 1;
  57
  58 select(STDOUT);
  59
  60 # open the chess engine
  61 my $engine = open_engine($remoteglotconf::engine_cmdline, 'E1', sub { handle_uci(@_, 1); });
  62 my $engine2 = open_engine($remoteglotconf::engine2_cmdline, 'E2', sub { handle_uci(@_, 0); });
  63 my $last_move;
  64 my $last_text = '';
  65 my ($pos_waiting, $pos_calculating, $pos_calculating_second_engine);
  66
  67 uciprint($engine, "setoption name UCI_AnalyseMode value true");
  68 while (my ($key, $value) = each %remoteglotconf::engine_config) {
  69         uciprint($engine, "setoption name $key value $value");
  70 }
  71 uciprint($engine, "ucinewgame");
  72
  73 if (defined($engine2)) {
  74         uciprint($engine2, "setoption name UCI_AnalyseMode value true");
  75         while (my ($key, $value) = each %remoteglotconf::engine2_config) {
  76                 uciprint($engine2, "setoption name $key value $value");
  77         }
  78         uciprint($engine2, "setoption name MultiPV value 500");
  79         uciprint($engine2, "ucinewgame");
  80 }
  81
  82 print "Chess engine ready.\n";
  83
  84 # now talk to FICS
  85 my $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
  86 $t->input_log(\*FICSLOG);
  87 $t->open($remoteglotconf::server);
  88 $t->print($remoteglotconf::nick);
  89 $t->waitfor('/Press return to enter the server/');
  90 $t->cmd("");
  91
  92 # set some options
  93 $t->cmd("set shout 0");
  94 $t->cmd("set seek 0");
  95 $t->cmd("set style 12");
  96
  97 my $ev1 = AnyEvent->io(
  98         fh => fileno($t),
  99         poll => 'r',
 100         cb => sub {    # what callback to execute
 101                 while (1) {
 102                         my $line = $t->getline(Timeout => 0, errmode => 'return');
 103                         return if (!defined($line));
 104
 105                         chomp $line;
 106                         $line =~ tr/\r//d;
 107                         handle_fics($line);
 108                 }
 109         }
 110 );
 111 if (defined($remoteglotconf::target)) {
 112         if ($remoteglotconf::target =~ /^http:/) {
 113                 fetch_pgn($remoteglotconf::target);
 114         } else {
 115                 $t->cmd("observe $remoteglotconf::target");
 116         }
 117 }
 118 print "FICS ready.\n";
 119
 120 # Engine events have already been set up by Engine.pm.
 121 EV::run;
 122
 123 sub handle_uci {
 124         my ($engine, $line, $primary) = @_;
 125
 126         return if $line =~ /(upper|lower)bound/;
 127
 128         $line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 129         print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
 130         if ($line =~ /^info/) {
 131                 my (@infos) = split / /, $line;
 132                 shift @infos;
 133
 134                 parse_infos($engine, @infos);
 135         }
 136         if ($line =~ /^id/) {
 137                 my (@ids) = split / /, $line;
 138                 shift @ids;
 139
 140                 parse_ids($engine, @ids);
 141         }
 142         if ($line =~ /^bestmove/) {
 143                 if ($primary) {
 144                         return if (!$remoteglotconf::uci_assume_full_compliance);
 145                         if (defined($pos_waiting)) {
 146                                 uciprint($engine, "position fen " . $pos_waiting->fen());
 147                                 uciprint($engine, "go infinite");
 148
 149                                 $pos_calculating = $pos_waiting;
 150                                 $pos_waiting = undef;
 151                         }
 152                 } else {
 153                         $engine2->{'info'} = {};
 154                         my $pos = $pos_waiting // $pos_calculating;
 155                         uciprint($engine2, "position fen " . $pos->fen());
 156                         uciprint($engine2, "go infinite");
 157                         $pos_calculating_second_engine = $pos;
 158                 }
 159         }
 160         output();
 161 }
 162
 163 my $getting_movelist = 0;
 164 my $pos_for_movelist = undef;
 165 my @uci_movelist = ();
 166 my @pretty_movelist = ();
 167
 168 sub handle_fics {
 169         my $line = shift;
 170         if ($line =~ /^<12> /) {
 171                 handle_position(Position->new($line));
 172                 $t->cmd("moves");
 173         }
 174         if ($line =~ /^Movelist for game /) {
 175                 my $pos = $pos_waiting // $pos_calculating;
 176                 if (defined($pos)) {
 177                         @uci_movelist = ();
 178                         @pretty_movelist = ();
 179                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 180                         $getting_movelist = 1;
 181                 }
 182         }
 183         if ($getting_movelist &&
 184             $line =~ /^\s* \d+\. \s+                     # move number
 185                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 186                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 187                      /x) {
 188                 eval {
 189                         my $uci_move;
 190                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 191                         push @uci_movelist, $uci_move;
 192                         push @pretty_movelist, $1;
 193
 194                         if (defined($2)) {
 195                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 196                                 push @uci_movelist, $uci_move;
 197                                 push @pretty_movelist, $2;
 198                         }
 199                 };
 200                 if ($@) {
 201                         warn "Error when getting FICS move history: $@";
 202                         exit;
 203                         $getting_movelist = 0;
 204                 }
 205         }
 206         if ($getting_movelist &&
 207             $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
 208                 # End of movelist.
 209                 for my $pos ($pos_waiting, $pos_calculating) {
 210                         next if (!defined($pos));
 211                         if ($pos->fen() eq $pos_for_movelist->fen()) {
 212                                 $pos->{'history'} = \@uci_movelist;
 213                                 $pos->{'pretty_history'} = \@pretty_movelist;
 214                         }
 215                 }
 216                 $getting_movelist = 0;
 217         }
 218         if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 219                 my ($who, $msg) = ($1, $2);
 220
 221                 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
 222
 223                 if ($msg =~ /^fics (.*?)$/) {
 224                         $t->cmd("tell $who Executing '$1' on FICS.");
 225                         $t->cmd($1);
 226                 } elsif ($msg =~ /^uci (.*?)$/) {
 227                         $t->cmd("tell $who Sending '$1' to the engine.");
 228                         print { $engine->{'write'} } "$1\n";
 229                 } elsif ($msg =~ /^pgn (.*?)$/) {
 230                         my $url = $1;
 231                         $t->cmd("tell $who Starting to poll '$url'.");
 232                         fetch_pgn($url);
 233                 } elsif ($msg =~ /^stoppgn$/) {
 234                         $t->cmd("tell $who Stopping poll.");
 235                         $http_timer = undef;
 236                 } elsif ($msg =~ /^quit$/) {
 237                         $t->cmd("tell $who Bye bye.");
 238                         exit;
 239                 } else {
 240                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 241                 }
 242         }
 243         #print "FICS: [$line]\n";
 244 }
 245
 246 # Starts periodic fetching of PGNs from the given URL.
 247 sub fetch_pgn {
 248         my ($url) = @_;
 249         AnyEvent::HTTP::http_get($url, sub {
 250                 handle_pgn(@_, $url);
 251         });
 252 }
 253
 254 my ($last_pgn_white, $last_pgn_black);
 255 my @last_pgn_uci_moves = ();
 256 my $pgn_hysteresis_counter = 0;
 257
 258 sub handle_pgn {
 259         my ($body, $header, $url) = @_;
 260         my $pgn = Chess::PGN::Parse->new(undef, $body);
 261         if (!defined($pgn) || !$pgn->read_game()) {
 262                 warn "Error in parsing PGN from $url\n";
 263         } else {
 264                 $pgn->quick_parse_game;
 265                 my $pos = Position->start_pos($pgn->white, $pgn->black);
 266                 my $moves = $pgn->moves;
 267                 my @uci_moves = ();
 268                 for my $move (@$moves) {
 269                         my ($pos, $uci_move) = $pos->make_pretty_move($move);
 270                         push @uci_moves, $uci_move;
 271                 }
 272                 $pos->{'history'} = \@uci_moves;
 273                 $pos->{'pretty_history'} = $moves;
 274
 275                 # Sometimes, PGNs lose a move or two for a short while,
 276                 # or people push out new ones non-atomically.
 277                 # Thus, if we PGN doesn't change names but becomes
 278                 # shorter, we mistrust it for a few seconds.
 279                 my $trust_pgn = 1;
 280                 if (defined($last_pgn_white) && defined($last_pgn_black) &&
 281                     $last_pgn_white eq $pgn->white &&
 282                     $last_pgn_black eq $pgn->black &&
 283                     scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 284                         if (++$pgn_hysteresis_counter < 3) {
 285                                 $trust_pgn = 0;
 286                         }
 287                 }
 288                 if ($trust_pgn) {
 289                         $last_pgn_white = $pgn->white;
 290                         $last_pgn_black = $pgn->black;
 291                         @last_pgn_uci_moves = @uci_moves;
 292                         $pgn_hysteresis_counter = 0;
 293                         handle_position($pos);
 294                 }
 295         }
 296
 297         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 298                 fetch_pgn($url);
 299         });
 300 }
 301
 302 sub handle_position {
 303         my ($pos) = @_;
 304
 305         # if this is already in the queue, ignore it
 306         return if (defined($pos_waiting) && $pos->fen() eq $pos_waiting->fen());
 307
 308         # if we're already chewing on this and there's nothing else in the queue,
 309         # also ignore it
 310         return if (!defined($pos_waiting) && defined($pos_calculating) &&
 311                  $pos->fen() eq $pos_calculating->fen());
 312
 313         # if we're already thinking on something, stop and wait for the engine
 314         # to approve
 315         if (defined($pos_calculating)) {
 316                 if (!defined($pos_waiting)) {
 317                         uciprint($engine, "stop");
 318                 }
 319                 if ($remoteglotconf::uci_assume_full_compliance) {
 320                         $pos_waiting = $pos;
 321                 } else {
 322                         uciprint($engine, "position fen " . $pos->fen());
 323                         uciprint($engine, "go infinite");
 324                         $pos_calculating = $pos;
 325                 }
 326         } else {
 327                 # it's wrong just to give the FEN (the move history is useful,
 328                 # and per the UCI spec, we should really have sent "ucinewgame"),
 329                 # but it's easier
 330                 uciprint($engine, "position fen " . $pos->fen());
 331                 uciprint($engine, "go infinite");
 332                 $pos_calculating = $pos;
 333         }
 334
 335         if (defined($engine2)) {
 336                 if (defined($pos_calculating_second_engine)) {
 337                         uciprint($engine2, "stop");
 338                 } else {
 339                         uciprint($engine2, "position fen " . $pos->fen());
 340                         uciprint($engine2, "go infinite");
 341                         $pos_calculating_second_engine = $pos;
 342                 }
 343                 $engine2->{'info'} = {};
 344         }
 345
 346         $engine->{'info'} = {};
 347         $last_move = time;
 348
 349         schedule_tb_lookup();
 350
 351         #
 352         # Output a command every move to note that we're
 353         # still paying attention -- this is a good tradeoff,
 354         # since if no move has happened in the last half
 355         # hour, the analysis/relay has most likely stopped
 356         # and we should stop hogging server resources.
 357         #
 358         $t->cmd("date");
 359 }
 360
 361 sub parse_infos {
 362         my ($engine, @x) = @_;
 363         my $mpv = '';
 364
 365         my $info = $engine->{'info'};
 366
 367         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 368         for my $i (0..$#x - 1) {
 369                 if ($x[$i] eq 'multipv') {
 370                         $mpv = $x[$i + 1];
 371                         next;
 372                 }
 373         }
 374
 375         while (scalar @x > 0) {
 376                 if ($x[0] eq 'multipv') {
 377                         # Dealt with above
 378                         shift @x;
 379                         shift @x;
 380                         next;
 381                 }
 382                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 383                         my $key = shift @x;
 384                         my $value = shift @x;
 385                         $info->{$key} = $value;
 386                         next;
 387                 }
 388                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 389                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 390                     $x[0] eq 'tbhits') {
 391                         my $key = shift @x;
 392                         my $value = shift @x;
 393                         $info->{$key . $mpv} = $value;
 394                         next;
 395                 }
 396                 if ($x[0] eq 'score') {
 397                         shift @x;
 398
 399                         delete $info->{'score_cp' . $mpv};
 400                         delete $info->{'score_mate' . $mpv};
 401
 402                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 403                                 if ($x[0] eq 'cp') {
 404                                         shift @x;
 405                                         $info->{'score_cp' . $mpv} = shift @x;
 406                                 } elsif ($x[0] eq 'mate') {
 407                                         shift @x;
 408                                         $info->{'score_mate' . $mpv} = shift @x;
 409                                 } else {
 410                                         shift @x;
 411                                 }
 412                         }
 413                         next;
 414                 }
 415                 if ($x[0] eq 'pv') {
 416                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 417                         last;
 418                 }
 419                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 420                         last;
 421                 }
 422
 423                 #print "unknown info '$x[0]', trying to recover...\n";
 424                 #shift @x;
 425                 die "Unknown info '" . join(',', @x) . "'";
 426
 427         }
 428 }
 429
 430 sub parse_ids {
 431         my ($engine, @x) = @_;
 432
 433         while (scalar @x > 0) {
 434                 if ($x[0] =~ /^(name|author)$/) {
 435                         my $key = shift @x;
 436                         my $value = join(' ', @x);
 437                         $engine->{'id'}{$key} = $value;
 438                         last;
 439                 }
 440
 441                 # unknown
 442                 shift @x;
 443         }
 444 }
 445
 446 sub prettyprint_pv_no_cache {
 447         my ($board, @pvs) = @_;
 448
 449         if (scalar @pvs == 0 || !defined($pvs[0])) {
 450                 return ();
 451         }
 452
 453         my $pv = shift @pvs;
 454         my ($from_col, $from_row, $to_col, $to_row, $promo) = parse_uci_move($pv);
 455         my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 456         return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
 457 }
 458
 459 sub prettyprint_pv {
 460         my ($pos, @pvs) = @_;
 461
 462         my $cachekey = join('', @pvs);
 463         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 464                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 465         } else {
 466                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 467                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 468                 return @res;
 469         }
 470 }
 471
 472 sub output {
 473         #return;
 474
 475         return if (!defined($pos_calculating));
 476
 477         # Don't update too often.
 478         my $age = Time::HiRes::tv_interval($latest_update);
 479         if ($age < $remoteglotconf::update_max_interval) {
 480                 Time::HiRes::alarm($remoteglotconf::update_max_interval + 0.01 - $age);
 481                 return;
 482         }
 483
 484         my $info = $engine->{'info'};
 485
 486         #
 487         # If we have tablebase data from a previous lookup, replace the
 488         # engine data with the data from the tablebase.
 489         #
 490         my $fen = $pos_calculating->fen();
 491         if (exists($tb_cache{$fen})) {
 492                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 493                         delete $info->{$key . '1'};
 494                         delete $info->{$key};
 495                 }
 496                 $info->{'nodes'} = 0;
 497                 $info->{'nps'} = 0;
 498                 $info->{'depth'} = 0;
 499                 $info->{'seldepth'} = 0;
 500                 $info->{'tbhits'} = 0;
 501
 502                 my $t = $tb_cache{$fen};
 503                 my $pv = $t->{'pv'};
 504                 my $matelen = int((1 + scalar @$pv) / 2);
 505                 if ($t->{'result'} eq '1/2-1/2') {
 506                         $info->{'score_cp'} = 0;
 507                 } elsif ($t->{'result'} eq '1-0') {
 508                         if ($pos_calculating->{'toplay'} eq 'B') {
 509                                 $info->{'score_mate'} = -$matelen;
 510                         } else {
 511                                 $info->{'score_mate'} = $matelen;
 512                         }
 513                 } else {
 514                         if ($pos_calculating->{'toplay'} eq 'B') {
 515                                 $info->{'score_mate'} = $matelen;
 516                         } else {
 517                                 $info->{'score_mate'} = -$matelen;
 518                         }
 519                 }
 520                 $info->{'pv'} = $pv;
 521                 $info->{'tablebase'} = 1;
 522         } else {
 523                 $info->{'tablebase'} = 0;
 524         }
 525
 526         #
 527         # Some programs _always_ report MultiPV, even with only one PV.
 528         # In this case, we simply use that data as if MultiPV was never
 529         # specified.
 530         #
 531         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 532                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 533                         if (exists($info->{$key . '1'})) {
 534                                 $info->{$key} = $info->{$key . '1'};
 535                         }
 536                 }
 537         }
 538
 539         #
 540         # Check the PVs first. if they're invalid, just wait, as our data
 541         # is most likely out of sync. This isn't a very good solution, as
 542         # it can frequently miss stuff, but it's good enough for most users.
 543         #
 544         eval {
 545                 my $dummy;
 546                 if (exists($info->{'pv'})) {
 547                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 548                 }
 549
 550                 my $mpv = 1;
 551                 while (exists($info->{'pv' . $mpv})) {
 552                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 553                         ++$mpv;
 554                 }
 555         };
 556         if ($@) {
 557                 $engine->{'info'} = {};
 558                 return;
 559         }
 560
 561         output_screen();
 562         output_json();
 563         $latest_update = [Time::HiRes::gettimeofday];
 564 }
 565
 566 sub output_screen {
 567         my $info = $engine->{'info'};
 568         my $id = $engine->{'id'};
 569
 570         my $text = 'Analysis';
 571         if ($pos_calculating->{'last_move'} ne 'none') {
 572                 if ($pos_calculating->{'toplay'} eq 'W') {
 573                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 574                 } else {
 575                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 576                 }
 577                 if (exists($id->{'name'})) {
 578                         $text .= ',';
 579                 }
 580         }
 581
 582         if (exists($id->{'name'})) {
 583                 $text .= " by $id->{'name'}:\n\n";
 584         } else {
 585                 $text .= ":\n\n";
 586         }
 587
 588         return unless (exists($pos_calculating->{'board'}));
 589
 590         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 591                 # multi-PV
 592                 my $mpv = 1;
 593                 while (exists($info->{'pv' . $mpv})) {
 594                         $text .= sprintf "  PV%2u", $mpv;
 595                         my $score = short_score($info, $pos_calculating, $mpv);
 596                         $text .= "  ($score)" if (defined($score));
 597
 598                         my $tbhits = '';
 599                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 600                                 if ($info->{'tbhits' . $mpv} == 1) {
 601                                         $tbhits = ", 1 tbhit";
 602                                 } else {
 603                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 604                                 }
 605                         }
 606
 607                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 608                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 609                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 610                         }
 611
 612                         $text .= ":\n";
 613                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 614                         $text .= "\n";
 615                         ++$mpv;
 616                 }
 617         } else {
 618                 # single-PV
 619                 my $score = long_score($info, $pos_calculating, '');
 620                 $text .= "  $score\n" if defined($score);
 621                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 622                 $text .=  "\n";
 623
 624                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 625                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 626                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 627                 }
 628                 if (exists($info->{'seldepth'})) {
 629                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 630                 }
 631                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 632                         if ($info->{'tbhits'} == 1) {
 633                                 $text .= ", one Syzygy hit";
 634                         } else {
 635                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 636                         }
 637                 }
 638                 $text .= "\n\n";
 639         }
 640
 641         #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
 642
 643         my @refutation_lines = ();
 644         if (defined($engine2)) {
 645                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 646                         my $info = $engine2->{'info'};
 647                         last if (!exists($info->{'pv' . $mpv}));
 648                         eval {
 649                                 my $pv = $info->{'pv' . $mpv};
 650
 651                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 652                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 653                                 if (scalar @pretty_pv > 5) {
 654                                         @pretty_pv = @pretty_pv[0..4];
 655                                         push @pretty_pv, "...";
 656                                 }
 657                                 my $key = $pretty_move;
 658                                 my $line = sprintf("  %-6s %6s %3s  %s",
 659                                         $pretty_move,
 660                                         short_score($info, $pos_calculating_second_engine, $mpv),
 661                                         "d" . $info->{'depth' . $mpv},
 662                                         join(', ', @pretty_pv));
 663                                 push @refutation_lines, [ $key, $line ];
 664                         };
 665                 }
 666         }
 667
 668         if ($#refutation_lines >= 0) {
 669                 $text .= "Shallow search of all legal moves:\n\n";
 670                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 671                         $text .= $line->[1] . "\n";
 672                 }
 673                 $text .= "\n\n";
 674         }
 675
 676         if ($last_text ne $text) {
 677                 print "\e[H\e[2J"; # clear the screen
 678                 print $text;
 679                 $last_text = $text;
 680         }
 681 }
 682
 683 sub output_json {
 684         my $info = $engine->{'info'};
 685
 686         my $json = {};
 687         $json->{'position'} = $pos_calculating->to_json_hash();
 688         $json->{'id'} = $engine->{'id'};
 689         $json->{'score'} = long_score($info, $pos_calculating, '');
 690         $json->{'short_score'} = short_score($info, $pos_calculating, '');
 691
 692         $json->{'nodes'} = $info->{'nodes'};
 693         $json->{'nps'} = $info->{'nps'};
 694         $json->{'depth'} = $info->{'depth'};
 695         $json->{'tbhits'} = $info->{'tbhits'};
 696         $json->{'seldepth'} = $info->{'seldepth'};
 697         $json->{'tablebase'} = $info->{'tablebase'};
 698
 699         # single-PV only for now
 700         $json->{'pv_uci'} = $info->{'pv'};
 701         $json->{'pv_pretty'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 702
 703         my %refutation_lines = ();
 704         my @refutation_lines = ();
 705         if (defined($engine2)) {
 706                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 707                         my $info = $engine2->{'info'};
 708                         my $pretty_move = "";
 709                         my @pretty_pv = ();
 710                         last if (!exists($info->{'pv' . $mpv}));
 711
 712                         eval {
 713                                 my $pv = $info->{'pv' . $mpv};
 714                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 715                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 716                                 $refutation_lines{$pv->[0]} = {
 717                                         sort_key => $pretty_move,
 718                                         depth => $info->{'depth' . $mpv},
 719                                         score_sort_key => score_sort_key($info, $pos_calculating, $mpv, 0),
 720                                         pretty_score => short_score($info, $pos_calculating, $mpv),
 721                                         pretty_move => $pretty_move,
 722                                         pv_pretty => \@pretty_pv,
 723                                 };
 724                                 $refutation_lines{$pv->[0]}->{'pv_uci'} = $pv;
 725                         };
 726                 }
 727         }
 728         $json->{'refutation_lines'} = \%refutation_lines;
 729
 730         open my $fh, ">", $remoteglotconf::json_output . ".tmp"
 731                 or return;
 732         print $fh JSON::XS::encode_json($json);
 733         close $fh;
 734         rename($remoteglotconf::json_output . ".tmp", $remoteglotconf::json_output);
 735 }
 736
 737 sub uciprint {
 738         my ($engine, $msg) = @_;
 739         $engine->print($msg);
 740         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
 741 }
 742
 743 sub short_score {
 744         my ($info, $pos, $mpv) = @_;
 745
 746         my $invert = ($pos->{'toplay'} eq 'B');
 747         if (defined($info->{'score_mate' . $mpv})) {
 748                 if ($invert) {
 749                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
 750                 } else {
 751                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
 752                 }
 753         } else {
 754                 if (exists($info->{'score_cp' . $mpv})) {
 755                         my $score = $info->{'score_cp' . $mpv} * 0.01;
 756                         if ($score == 0) {
 757                                 if ($info->{'tablebase'}) {
 758                                         return "TB draw";
 759                                 } else {
 760                                         return " 0.00";
 761                                 }
 762                         }
 763                         if ($invert) {
 764                                 $score = -$score;
 765                         }
 766                         return sprintf "%+5.2f", $score;
 767                 }
 768         }
 769
 770         return undef;
 771 }
 772
 773 sub score_sort_key {
 774         my ($info, $pos, $mpv, $invert) = @_;
 775
 776         if (defined($info->{'score_mate' . $mpv})) {
 777                 my $mate = $info->{'score_mate' . $mpv};
 778                 my $score;
 779                 if ($mate > 0) {
 780                         # Side to move mates
 781                         $score = 99999 - $mate;
 782                 } else {
 783                         # Side to move is getting mated (note the double negative for $mate)
 784                         $score = -99999 - $mate;
 785                 }
 786                 if ($invert) {
 787                         $score = -$score;
 788                 }
 789                 return $score;
 790         } else {
 791                 if (exists($info->{'score_cp' . $mpv})) {
 792                         my $score = $info->{'score_cp' . $mpv};
 793                         if ($invert) {
 794                                 $score = -$score;
 795                         }
 796                         return $score;
 797                 }
 798         }
 799
 800         return undef;
 801 }
 802
 803 sub long_score {
 804         my ($info, $pos, $mpv) = @_;
 805
 806         if (defined($info->{'score_mate' . $mpv})) {
 807                 my $mate = $info->{'score_mate' . $mpv};
 808                 if ($pos->{'toplay'} eq 'B') {
 809                         $mate = -$mate;
 810                 }
 811                 if ($mate > 0) {
 812                         return sprintf "White mates in %u", $mate;
 813                 } else {
 814                         return sprintf "Black mates in %u", -$mate;
 815                 }
 816         } else {
 817                 if (exists($info->{'score_cp' . $mpv})) {
 818                         my $score = $info->{'score_cp' . $mpv} * 0.01;
 819                         if ($score == 0) {
 820                                 if ($info->{'tablebase'}) {
 821                                         return "Theoretical draw";
 822                                 } else {
 823                                         return "Score:  0.00";
 824                                 }
 825                         }
 826                         if ($pos->{'toplay'} eq 'B') {
 827                                 $score = -$score;
 828                         }
 829                         return sprintf "Score: %+5.2f", $score;
 830                 }
 831         }
 832
 833         return undef;
 834 }
 835
 836 my %book_cache = ();
 837 sub book_info {
 838         my ($fen, $board, $toplay) = @_;
 839
 840         if (exists($book_cache{$fen})) {
 841                 return $book_cache{$fen};
 842         }
 843
 844         my $ret = `./booklook $fen`;
 845         return "" if ($ret =~ /Not found/ || $ret eq '');
 846
 847         my @moves = ();
 848
 849         for my $m (split /\n/, $ret) {
 850                 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
 851
 852                 my $pmove;
 853                 if ($move eq '')  {
 854                         $pmove = '(current)';
 855                 } else {
 856                         ($pmove) = prettyprint_pv_no_cache($board, $move);
 857                         $pmove .= $annotation;
 858                 }
 859
 860                 my $score;
 861                 if ($toplay eq 'W') {
 862                         $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
 863                 } else {
 864                         $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
 865                 }
 866                 my $n = $win + $draw + $lose;
 867
 868                 my $percent;
 869                 if ($n == 0) {
 870                         $percent = "     ";
 871                 } else {
 872                         $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
 873                 }
 874
 875                 push @moves, [ $pmove, $n, $percent, $rating ];
 876         }
 877
 878         @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
 879
 880         my $text = "Book moves:\n\n              Perf.     N     Rating\n\n";
 881         for my $m (@moves) {
 882                 $text .= sprintf "  %-10s %s   %6u    %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
 883         }
 884
 885         return $text;
 886 }
 887
 888 sub schedule_tb_lookup {
 889         return if (!defined($remoteglotconf::tb_serial_key));
 890         my $pos = $pos_waiting // $pos_calculating;
 891         return if (exists($tb_cache{$pos->fen()}));
 892
 893         # If there's more than seven pieces, there's not going to be an answer,
 894         # so don't bother.
 895         return if ($pos->num_pieces() > 7);
 896
 897         # Max one at a time. If it's still relevant when it returns,
 898         # schedule_tb_lookup() will be called again.
 899         return if ($tb_lookup_running);
 900
 901         $tb_lookup_running = 1;
 902         my $url = 'http://158.250.18.203:6904/tasks/addtask?auth.login=' .
 903                 $remoteglotconf::tb_serial_key .
 904                 '&auth.password=aquarium&type=0&fen=' .
 905                 URI::Escape::uri_escape($pos->fen());
 906         print TBLOG "Downloading $url...\n";
 907         AnyEvent::HTTP::http_get($url, sub {
 908                 handle_tb_lookup_return(@_, $pos, $pos->fen());
 909         });
 910 }
 911
 912 sub handle_tb_lookup_return {
 913         my ($body, $header, $pos, $fen) = @_;
 914         print TBLOG "Response for [$fen]:\n";
 915         print TBLOG $header . "\n\n";
 916         print TBLOG $body . "\n\n";
 917         eval {
 918                 my $response = JSON::XS::decode_json($body);
 919                 if ($response->{'ErrorCode'} != 0) {
 920                         die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
 921                 }
 922                 my $state = $response->{'Response'}{'StateString'};
 923                 if ($state eq 'COMPLETE') {
 924                         my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
 925                         if (!defined($pgn) || !$pgn->read_game()) {
 926                                 warn "Error in parsing PGN\n";
 927                         } else {
 928                                 $pgn->quick_parse_game;
 929                                 my $pvpos = $pos;
 930                                 my $moves = $pgn->moves;
 931                                 my @uci_moves = ();
 932                                 for my $move (@$moves) {
 933                                         my ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
 934                                         push @uci_moves, $uci_move;
 935                                 }
 936                                 $tb_cache{$fen} = {
 937                                         result => $pgn->result,
 938                                         pv => \@uci_moves
 939                                 };
 940                                 output();
 941                         }
 942                 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
 943                         # Try again in a second. Note that if we have changed
 944                         # position in the meantime, we might query a completely
 945                         # different position! But that's fine.
 946                 } else {
 947                         die "Unknown response state " . $state;
 948                 }
 949
 950                 # Wait a second before we schedule another one.
 951                 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
 952                         $tb_lookup_running = 0;
 953                         schedule_tb_lookup();
 954                 });
 955         };
 956         if ($@) {
 957                 warn "Error in tablebase lookup: $@";
 958
 959                 # Don't try this one again, but don't block new lookups either.
 960                 $tb_lookup_running = 0;
 961         }
 962 }
 963
 964 sub open_engine {
 965         my ($cmdline, $tag, $cb) = @_;
 966         return undef if (!defined($cmdline));
 967         return Engine->open($cmdline, $tag, $cb);
 968 }
 969
 970 sub col_letter_to_num {
 971         return ord(shift) - ord('a');
 972 }
 973
 974 sub row_letter_to_num {
 975         return 7 - (ord(shift) - ord('1'));
 976 }
 977
 978 sub parse_uci_move {
 979         my $move = shift;
 980         my $from_col = col_letter_to_num(substr($move, 0, 1));
 981         my $from_row = row_letter_to_num(substr($move, 1, 1));
 982         my $to_col   = col_letter_to_num(substr($move, 2, 1));
 983         my $to_row   = row_letter_to_num(substr($move, 3, 1));
 984         my $promo    = substr($move, 4, 1);
 985         return ($from_col, $from_row, $to_col, $to_row, $promo);
 986 }