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 my $latest_update = undef;
  32 my $output_timer = undef;
  33 my $http_timer = undef;
  34 my $stop_pgn_fetch = 0;
  35 my $tb_retry_timer = undef;
  36 my %tb_cache = ();
  37 my $tb_lookup_running = 0;
  38
  39 $| = 1;
  40
  41 open(FICSLOG, ">ficslog.txt")
  42         or die "ficslog.txt: $!";
  43 print FICSLOG "Log starting.\n";
  44 select(FICSLOG);
  45 $| = 1;
  46
  47 open(UCILOG, ">ucilog.txt")
  48         or die "ucilog.txt: $!";
  49 print UCILOG "Log starting.\n";
  50 select(UCILOG);
  51 $| = 1;
  52
  53 open(TBLOG, ">tblog.txt")
  54         or die "tblog.txt: $!";
  55 print TBLOG "Log starting.\n";
  56 select(TBLOG);
  57 $| = 1;
  58
  59 select(STDOUT);
  60
  61 # open the chess engine
  62 my $engine = open_engine($remoteglotconf::engine_cmdline, 'E1', sub { handle_uci(@_, 1); });
  63 my $engine2 = open_engine($remoteglotconf::engine2_cmdline, 'E2', sub { handle_uci(@_, 0); });
  64 my $last_move;
  65 my $last_text = '';
  66 my ($pos_waiting, $pos_calculating, $pos_calculating_second_engine);
  67
  68 uciprint($engine, "setoption name UCI_AnalyseMode value true");
  69 while (my ($key, $value) = each %remoteglotconf::engine_config) {
  70         uciprint($engine, "setoption name $key value $value");
  71 }
  72 uciprint($engine, "ucinewgame");
  73
  74 if (defined($engine2)) {
  75         uciprint($engine2, "setoption name UCI_AnalyseMode value true");
  76         while (my ($key, $value) = each %remoteglotconf::engine2_config) {
  77                 uciprint($engine2, "setoption name $key value $value");
  78         }
  79         uciprint($engine2, "setoption name MultiPV value 500");
  80         uciprint($engine2, "ucinewgame");
  81 }
  82
  83 print "Chess engine ready.\n";
  84
  85 # now talk to FICS
  86 my $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
  87 $t->input_log(\*FICSLOG);
  88 $t->open($remoteglotconf::server);
  89 $t->print($remoteglotconf::nick);
  90 $t->waitfor('/Press return to enter the server/');
  91 $t->cmd("");
  92
  93 # set some options
  94 $t->cmd("set shout 0");
  95 $t->cmd("set seek 0");
  96 $t->cmd("set style 12");
  97
  98 my $ev1 = AnyEvent->io(
  99         fh => fileno($t),
 100         poll => 'r',
 101         cb => sub {    # what callback to execute
 102                 while (1) {
 103                         my $line = $t->getline(Timeout => 0, errmode => 'return');
 104                         return if (!defined($line));
 105
 106                         chomp $line;
 107                         $line =~ tr/\r//d;
 108                         handle_fics($line);
 109                 }
 110         }
 111 );
 112 if (defined($remoteglotconf::target)) {
 113         if ($remoteglotconf::target =~ /^http:/) {
 114                 fetch_pgn($remoteglotconf::target);
 115         } else {
 116                 $t->cmd("observe $remoteglotconf::target");
 117         }
 118 }
 119 print "FICS ready.\n";
 120
 121 # Engine events have already been set up by Engine.pm.
 122 EV::run;
 123
 124 sub handle_uci {
 125         my ($engine, $line, $primary) = @_;
 126
 127         return if $line =~ /(upper|lower)bound/;
 128
 129         $line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 130         print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
 131         if ($line =~ /^info/) {
 132                 my (@infos) = split / /, $line;
 133                 shift @infos;
 134
 135                 parse_infos($engine, @infos);
 136         }
 137         if ($line =~ /^id/) {
 138                 my (@ids) = split / /, $line;
 139                 shift @ids;
 140
 141                 parse_ids($engine, @ids);
 142         }
 143         if ($line =~ /^bestmove/) {
 144                 if ($primary) {
 145                         return if (!$remoteglotconf::uci_assume_full_compliance);
 146                         if (defined($pos_waiting)) {
 147                                 uciprint($engine, "position fen " . $pos_waiting->fen());
 148                                 uciprint($engine, "go infinite");
 149
 150                                 $pos_calculating = $pos_waiting;
 151                                 $pos_waiting = undef;
 152                         }
 153                 } else {
 154                         $engine2->{'info'} = {};
 155                         my $pos = $pos_waiting // $pos_calculating;
 156                         uciprint($engine2, "position fen " . $pos->fen());
 157                         uciprint($engine2, "go infinite");
 158                         $pos_calculating_second_engine = $pos;
 159                 }
 160         }
 161         output();
 162 }
 163
 164 my $getting_movelist = 0;
 165 my $pos_for_movelist = undef;
 166 my @uci_movelist = ();
 167 my @pretty_movelist = ();
 168
 169 sub handle_fics {
 170         my $line = shift;
 171         if ($line =~ /^<12> /) {
 172                 handle_position(Position->new($line));
 173                 $t->cmd("moves");
 174         }
 175         if ($line =~ /^Movelist for game /) {
 176                 my $pos = $pos_waiting // $pos_calculating;
 177                 if (defined($pos)) {
 178                         @uci_movelist = ();
 179                         @pretty_movelist = ();
 180                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 181                         $getting_movelist = 1;
 182                 }
 183         }
 184         if ($getting_movelist &&
 185             $line =~ /^\s* \d+\. \s+                     # move number
 186                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 187                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 188                      /x) {
 189                 eval {
 190                         my $uci_move;
 191                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 192                         push @uci_movelist, $uci_move;
 193                         push @pretty_movelist, $1;
 194
 195                         if (defined($2)) {
 196                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 197                                 push @uci_movelist, $uci_move;
 198                                 push @pretty_movelist, $2;
 199                         }
 200                 };
 201                 if ($@) {
 202                         warn "Error when getting FICS move history: $@";
 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                         $stop_pgn_fetch = 1;
 236                         $http_timer = undef;
 237                 } elsif ($msg =~ /^quit$/) {
 238                         $t->cmd("tell $who Bye bye.");
 239                         exit;
 240                 } else {
 241                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 242                 }
 243         }
 244         #print "FICS: [$line]\n";
 245 }
 246
 247 # Starts periodic fetching of PGNs from the given URL.
 248 sub fetch_pgn {
 249         my ($url) = @_;
 250         AnyEvent::HTTP::http_get($url, sub {
 251                 handle_pgn(@_, $url);
 252         });
 253 }
 254
 255 my ($last_pgn_white, $last_pgn_black);
 256 my @last_pgn_uci_moves = ();
 257 my $pgn_hysteresis_counter = 0;
 258
 259 sub handle_pgn {
 260         my ($body, $header, $url) = @_;
 261
 262         if ($stop_pgn_fetch) {
 263                 $stop_pgn_fetch = 0;
 264                 $http_timer = undef;
 265                 return;
 266         }
 267
 268         my $pgn = Chess::PGN::Parse->new(undef, $body);
 269         if (!defined($pgn) || !$pgn->read_game()) {
 270                 warn "Error in parsing PGN from $url\n";
 271         } else {
 272                 $pgn->quick_parse_game;
 273                 my $pos = Position->start_pos($pgn->white, $pgn->black);
 274                 my $moves = $pgn->moves;
 275                 my @uci_moves = ();
 276                 for my $move (@$moves) {
 277                         my $uci_move;
 278                         ($pos, $uci_move) = $pos->make_pretty_move($move);
 279                         push @uci_moves, $uci_move;
 280                 }
 281                 $pos->{'history'} = \@uci_moves;
 282                 $pos->{'pretty_history'} = $moves;
 283
 284                 # Sometimes, PGNs lose a move or two for a short while,
 285                 # or people push out new ones non-atomically.
 286                 # Thus, if we PGN doesn't change names but becomes
 287                 # shorter, we mistrust it for a few seconds.
 288                 my $trust_pgn = 1;
 289                 if (defined($last_pgn_white) && defined($last_pgn_black) &&
 290                     $last_pgn_white eq $pgn->white &&
 291                     $last_pgn_black eq $pgn->black &&
 292                     scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 293                         if (++$pgn_hysteresis_counter < 3) {
 294                                 $trust_pgn = 0;
 295                         }
 296                 }
 297                 if ($trust_pgn) {
 298                         $last_pgn_white = $pgn->white;
 299                         $last_pgn_black = $pgn->black;
 300                         @last_pgn_uci_moves = @uci_moves;
 301                         $pgn_hysteresis_counter = 0;
 302                         handle_position($pos);
 303                 }
 304         }
 305
 306         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 307                 fetch_pgn($url);
 308         });
 309 }
 310
 311 sub handle_position {
 312         my ($pos) = @_;
 313
 314         # if this is already in the queue, ignore it
 315         return if (defined($pos_waiting) && $pos->fen() eq $pos_waiting->fen());
 316
 317         # if we're already chewing on this and there's nothing else in the queue,
 318         # also ignore it
 319         return if (!defined($pos_waiting) && defined($pos_calculating) &&
 320                  $pos->fen() eq $pos_calculating->fen());
 321
 322         # if we're already thinking on something, stop and wait for the engine
 323         # to approve
 324         if (defined($pos_calculating)) {
 325                 if (!defined($pos_waiting)) {
 326                         uciprint($engine, "stop");
 327                 }
 328                 if ($remoteglotconf::uci_assume_full_compliance) {
 329                         $pos_waiting = $pos;
 330                 } else {
 331                         uciprint($engine, "position fen " . $pos->fen());
 332                         uciprint($engine, "go infinite");
 333                         $pos_calculating = $pos;
 334                 }
 335         } else {
 336                 # it's wrong just to give the FEN (the move history is useful,
 337                 # and per the UCI spec, we should really have sent "ucinewgame"),
 338                 # but it's easier
 339                 uciprint($engine, "position fen " . $pos->fen());
 340                 uciprint($engine, "go infinite");
 341                 $pos_calculating = $pos;
 342         }
 343
 344         if (defined($engine2)) {
 345                 if (defined($pos_calculating_second_engine)) {
 346                         uciprint($engine2, "stop");
 347                 } else {
 348                         uciprint($engine2, "position fen " . $pos->fen());
 349                         uciprint($engine2, "go infinite");
 350                         $pos_calculating_second_engine = $pos;
 351                 }
 352                 $engine2->{'info'} = {};
 353         }
 354
 355         $engine->{'info'} = {};
 356         $last_move = time;
 357
 358         schedule_tb_lookup();
 359
 360         #
 361         # Output a command every move to note that we're
 362         # still paying attention -- this is a good tradeoff,
 363         # since if no move has happened in the last half
 364         # hour, the analysis/relay has most likely stopped
 365         # and we should stop hogging server resources.
 366         #
 367         $t->cmd("date");
 368 }
 369
 370 sub parse_infos {
 371         my ($engine, @x) = @_;
 372         my $mpv = '';
 373
 374         my $info = $engine->{'info'};
 375
 376         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 377         for my $i (0..$#x - 1) {
 378                 if ($x[$i] eq 'multipv') {
 379                         $mpv = $x[$i + 1];
 380                         next;
 381                 }
 382         }
 383
 384         while (scalar @x > 0) {
 385                 if ($x[0] eq 'multipv') {
 386                         # Dealt with above
 387                         shift @x;
 388                         shift @x;
 389                         next;
 390                 }
 391                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 392                         my $key = shift @x;
 393                         my $value = shift @x;
 394                         $info->{$key} = $value;
 395                         next;
 396                 }
 397                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 398                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 399                     $x[0] eq 'tbhits') {
 400                         my $key = shift @x;
 401                         my $value = shift @x;
 402                         $info->{$key . $mpv} = $value;
 403                         next;
 404                 }
 405                 if ($x[0] eq 'score') {
 406                         shift @x;
 407
 408                         delete $info->{'score_cp' . $mpv};
 409                         delete $info->{'score_mate' . $mpv};
 410
 411                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 412                                 if ($x[0] eq 'cp') {
 413                                         shift @x;
 414                                         $info->{'score_cp' . $mpv} = shift @x;
 415                                 } elsif ($x[0] eq 'mate') {
 416                                         shift @x;
 417                                         $info->{'score_mate' . $mpv} = shift @x;
 418                                 } else {
 419                                         shift @x;
 420                                 }
 421                         }
 422                         next;
 423                 }
 424                 if ($x[0] eq 'pv') {
 425                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 426                         last;
 427                 }
 428                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 429                         last;
 430                 }
 431
 432                 #print "unknown info '$x[0]', trying to recover...\n";
 433                 #shift @x;
 434                 die "Unknown info '" . join(',', @x) . "'";
 435
 436         }
 437 }
 438
 439 sub parse_ids {
 440         my ($engine, @x) = @_;
 441
 442         while (scalar @x > 0) {
 443                 if ($x[0] =~ /^(name|author)$/) {
 444                         my $key = shift @x;
 445                         my $value = join(' ', @x);
 446                         $engine->{'id'}{$key} = $value;
 447                         last;
 448                 }
 449
 450                 # unknown
 451                 shift @x;
 452         }
 453 }
 454
 455 sub prettyprint_pv_no_cache {
 456         my ($board, @pvs) = @_;
 457
 458         if (scalar @pvs == 0 || !defined($pvs[0])) {
 459                 return ();
 460         }
 461
 462         my $pv = shift @pvs;
 463         my ($from_col, $from_row, $to_col, $to_row, $promo) = parse_uci_move($pv);
 464         my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 465         return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
 466 }
 467
 468 sub prettyprint_pv {
 469         my ($pos, @pvs) = @_;
 470
 471         my $cachekey = join('', @pvs);
 472         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 473                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 474         } else {
 475                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 476                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 477                 return @res;
 478         }
 479 }
 480
 481 sub output {
 482         #return;
 483
 484         return if (!defined($pos_calculating));
 485
 486         # Don't update too often.
 487         my $age = Time::HiRes::tv_interval($latest_update);
 488         if ($age < $remoteglotconf::update_max_interval) {
 489                 my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
 490                 $output_timer = AnyEvent->timer(after => $wait, cb => \&output);
 491                 return;
 492         }
 493
 494         my $info = $engine->{'info'};
 495
 496         #
 497         # If we have tablebase data from a previous lookup, replace the
 498         # engine data with the data from the tablebase.
 499         #
 500         my $fen = $pos_calculating->fen();
 501         if (exists($tb_cache{$fen})) {
 502                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 503                         delete $info->{$key . '1'};
 504                         delete $info->{$key};
 505                 }
 506                 $info->{'nodes'} = 0;
 507                 $info->{'nps'} = 0;
 508                 $info->{'depth'} = 0;
 509                 $info->{'seldepth'} = 0;
 510                 $info->{'tbhits'} = 0;
 511
 512                 my $t = $tb_cache{$fen};
 513                 my $pv = $t->{'pv'};
 514                 my $matelen = int((1 + scalar @$pv) / 2);
 515                 if ($t->{'result'} eq '1/2-1/2') {
 516                         $info->{'score_cp'} = 0;
 517                 } elsif ($t->{'result'} eq '1-0') {
 518                         if ($pos_calculating->{'toplay'} eq 'B') {
 519                                 $info->{'score_mate'} = -$matelen;
 520                         } else {
 521                                 $info->{'score_mate'} = $matelen;
 522                         }
 523                 } else {
 524                         if ($pos_calculating->{'toplay'} eq 'B') {
 525                                 $info->{'score_mate'} = $matelen;
 526                         } else {
 527                                 $info->{'score_mate'} = -$matelen;
 528                         }
 529                 }
 530                 $info->{'pv'} = $pv;
 531                 $info->{'tablebase'} = 1;
 532         } else {
 533                 $info->{'tablebase'} = 0;
 534         }
 535
 536         #
 537         # Some programs _always_ report MultiPV, even with only one PV.
 538         # In this case, we simply use that data as if MultiPV was never
 539         # specified.
 540         #
 541         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 542                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 543                         if (exists($info->{$key . '1'})) {
 544                                 $info->{$key} = $info->{$key . '1'};
 545                         }
 546                 }
 547         }
 548
 549         #
 550         # Check the PVs first. if they're invalid, just wait, as our data
 551         # is most likely out of sync. This isn't a very good solution, as
 552         # it can frequently miss stuff, but it's good enough for most users.
 553         #
 554         eval {
 555                 my $dummy;
 556                 if (exists($info->{'pv'})) {
 557                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 558                 }
 559
 560                 my $mpv = 1;
 561                 while (exists($info->{'pv' . $mpv})) {
 562                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 563                         ++$mpv;
 564                 }
 565         };
 566         if ($@) {
 567                 $engine->{'info'} = {};
 568                 return;
 569         }
 570
 571         output_screen();
 572         output_json();
 573         $latest_update = [Time::HiRes::gettimeofday];
 574 }
 575
 576 sub output_screen {
 577         my $info = $engine->{'info'};
 578         my $id = $engine->{'id'};
 579
 580         my $text = 'Analysis';
 581         if ($pos_calculating->{'last_move'} ne 'none') {
 582                 if ($pos_calculating->{'toplay'} eq 'W') {
 583                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 584                 } else {
 585                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 586                 }
 587                 if (exists($id->{'name'})) {
 588                         $text .= ',';
 589                 }
 590         }
 591
 592         if (exists($id->{'name'})) {
 593                 $text .= " by $id->{'name'}:\n\n";
 594         } else {
 595                 $text .= ":\n\n";
 596         }
 597
 598         return unless (exists($pos_calculating->{'board'}));
 599
 600         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 601                 # multi-PV
 602                 my $mpv = 1;
 603                 while (exists($info->{'pv' . $mpv})) {
 604                         $text .= sprintf "  PV%2u", $mpv;
 605                         my $score = short_score($info, $pos_calculating, $mpv);
 606                         $text .= "  ($score)" if (defined($score));
 607
 608                         my $tbhits = '';
 609                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 610                                 if ($info->{'tbhits' . $mpv} == 1) {
 611                                         $tbhits = ", 1 tbhit";
 612                                 } else {
 613                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 614                                 }
 615                         }
 616
 617                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 618                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 619                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 620                         }
 621
 622                         $text .= ":\n";
 623                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 624                         $text .= "\n";
 625                         ++$mpv;
 626                 }
 627         } else {
 628                 # single-PV
 629                 my $score = long_score($info, $pos_calculating, '');
 630                 $text .= "  $score\n" if defined($score);
 631                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 632                 $text .=  "\n";
 633
 634                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 635                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 636                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 637                 }
 638                 if (exists($info->{'seldepth'})) {
 639                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 640                 }
 641                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 642                         if ($info->{'tbhits'} == 1) {
 643                                 $text .= ", one Syzygy hit";
 644                         } else {
 645                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 646                         }
 647                 }
 648                 $text .= "\n\n";
 649         }
 650
 651         #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
 652
 653         my @refutation_lines = ();
 654         if (defined($engine2)) {
 655                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 656                         my $info = $engine2->{'info'};
 657                         last if (!exists($info->{'pv' . $mpv}));
 658                         eval {
 659                                 my $pv = $info->{'pv' . $mpv};
 660
 661                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 662                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 663                                 if (scalar @pretty_pv > 5) {
 664                                         @pretty_pv = @pretty_pv[0..4];
 665                                         push @pretty_pv, "...";
 666                                 }
 667                                 my $key = $pretty_move;
 668                                 my $line = sprintf("  %-6s %6s %3s  %s",
 669                                         $pretty_move,
 670                                         short_score($info, $pos_calculating_second_engine, $mpv),
 671                                         "d" . $info->{'depth' . $mpv},
 672                                         join(', ', @pretty_pv));
 673                                 push @refutation_lines, [ $key, $line ];
 674                         };
 675                 }
 676         }
 677
 678         if ($#refutation_lines >= 0) {
 679                 $text .= "Shallow search of all legal moves:\n\n";
 680                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 681                         $text .= $line->[1] . "\n";
 682                 }
 683                 $text .= "\n\n";
 684         }
 685
 686         if ($last_text ne $text) {
 687                 print "\e[H\e[2J"; # clear the screen
 688                 print $text;
 689                 $last_text = $text;
 690         }
 691 }
 692
 693 sub output_json {
 694         my $info = $engine->{'info'};
 695
 696         my $json = {};
 697         $json->{'position'} = $pos_calculating->to_json_hash();
 698         $json->{'id'} = $engine->{'id'};
 699         $json->{'score'} = long_score($info, $pos_calculating, '');
 700         $json->{'short_score'} = short_score($info, $pos_calculating, '');
 701
 702         $json->{'nodes'} = $info->{'nodes'};
 703         $json->{'nps'} = $info->{'nps'};
 704         $json->{'depth'} = $info->{'depth'};
 705         $json->{'tbhits'} = $info->{'tbhits'};
 706         $json->{'seldepth'} = $info->{'seldepth'};
 707         $json->{'tablebase'} = $info->{'tablebase'};
 708
 709         # single-PV only for now
 710         $json->{'pv_uci'} = $info->{'pv'};
 711         $json->{'pv_pretty'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 712
 713         my %refutation_lines = ();
 714         my @refutation_lines = ();
 715         if (defined($engine2)) {
 716                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 717                         my $info = $engine2->{'info'};
 718                         my $pretty_move = "";
 719                         my @pretty_pv = ();
 720                         last if (!exists($info->{'pv' . $mpv}));
 721
 722                         eval {
 723                                 my $pv = $info->{'pv' . $mpv};
 724                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 725                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 726                                 $refutation_lines{$pv->[0]} = {
 727                                         sort_key => $pretty_move,
 728                                         depth => $info->{'depth' . $mpv},
 729                                         score_sort_key => score_sort_key($info, $pos_calculating, $mpv, 0),
 730                                         pretty_score => short_score($info, $pos_calculating, $mpv),
 731                                         pretty_move => $pretty_move,
 732                                         pv_pretty => \@pretty_pv,
 733                                 };
 734                                 $refutation_lines{$pv->[0]}->{'pv_uci'} = $pv;
 735                         };
 736                 }
 737         }
 738         $json->{'refutation_lines'} = \%refutation_lines;
 739
 740         open my $fh, ">", $remoteglotconf::json_output . ".tmp"
 741                 or return;
 742         print $fh JSON::XS::encode_json($json);
 743         close $fh;
 744         rename($remoteglotconf::json_output . ".tmp", $remoteglotconf::json_output);
 745 }
 746
 747 sub uciprint {
 748         my ($engine, $msg) = @_;
 749         $engine->print($msg);
 750         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
 751 }
 752
 753 sub short_score {
 754         my ($info, $pos, $mpv) = @_;
 755
 756         my $invert = ($pos->{'toplay'} eq 'B');
 757         if (defined($info->{'score_mate' . $mpv})) {
 758                 if ($invert) {
 759                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
 760                 } else {
 761                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
 762                 }
 763         } else {
 764                 if (exists($info->{'score_cp' . $mpv})) {
 765                         my $score = $info->{'score_cp' . $mpv} * 0.01;
 766                         if ($score == 0) {
 767                                 if ($info->{'tablebase'}) {
 768                                         return "TB draw";
 769                                 } else {
 770                                         return " 0.00";
 771                                 }
 772                         }
 773                         if ($invert) {
 774                                 $score = -$score;
 775                         }
 776                         return sprintf "%+5.2f", $score;
 777                 }
 778         }
 779
 780         return undef;
 781 }
 782
 783 sub score_sort_key {
 784         my ($info, $pos, $mpv, $invert) = @_;
 785
 786         if (defined($info->{'score_mate' . $mpv})) {
 787                 my $mate = $info->{'score_mate' . $mpv};
 788                 my $score;
 789                 if ($mate > 0) {
 790                         # Side to move mates
 791                         $score = 99999 - $mate;
 792                 } else {
 793                         # Side to move is getting mated (note the double negative for $mate)
 794                         $score = -99999 - $mate;
 795                 }
 796                 if ($invert) {
 797                         $score = -$score;
 798                 }
 799                 return $score;
 800         } else {
 801                 if (exists($info->{'score_cp' . $mpv})) {
 802                         my $score = $info->{'score_cp' . $mpv};
 803                         if ($invert) {
 804                                 $score = -$score;
 805                         }
 806                         return $score;
 807                 }
 808         }
 809
 810         return undef;
 811 }
 812
 813 sub long_score {
 814         my ($info, $pos, $mpv) = @_;
 815
 816         if (defined($info->{'score_mate' . $mpv})) {
 817                 my $mate = $info->{'score_mate' . $mpv};
 818                 if ($pos->{'toplay'} eq 'B') {
 819                         $mate = -$mate;
 820                 }
 821                 if ($mate > 0) {
 822                         return sprintf "White mates in %u", $mate;
 823                 } else {
 824                         return sprintf "Black mates in %u", -$mate;
 825                 }
 826         } else {
 827                 if (exists($info->{'score_cp' . $mpv})) {
 828                         my $score = $info->{'score_cp' . $mpv} * 0.01;
 829                         if ($score == 0) {
 830                                 if ($info->{'tablebase'}) {
 831                                         return "Theoretical draw";
 832                                 } else {
 833                                         return "Score:  0.00";
 834                                 }
 835                         }
 836                         if ($pos->{'toplay'} eq 'B') {
 837                                 $score = -$score;
 838                         }
 839                         return sprintf "Score: %+5.2f", $score;
 840                 }
 841         }
 842
 843         return undef;
 844 }
 845
 846 my %book_cache = ();
 847 sub book_info {
 848         my ($fen, $board, $toplay) = @_;
 849
 850         if (exists($book_cache{$fen})) {
 851                 return $book_cache{$fen};
 852         }
 853
 854         my $ret = `./booklook $fen`;
 855         return "" if ($ret =~ /Not found/ || $ret eq '');
 856
 857         my @moves = ();
 858
 859         for my $m (split /\n/, $ret) {
 860                 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
 861
 862                 my $pmove;
 863                 if ($move eq '')  {
 864                         $pmove = '(current)';
 865                 } else {
 866                         ($pmove) = prettyprint_pv_no_cache($board, $move);
 867                         $pmove .= $annotation;
 868                 }
 869
 870                 my $score;
 871                 if ($toplay eq 'W') {
 872                         $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
 873                 } else {
 874                         $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
 875                 }
 876                 my $n = $win + $draw + $lose;
 877
 878                 my $percent;
 879                 if ($n == 0) {
 880                         $percent = "     ";
 881                 } else {
 882                         $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
 883                 }
 884
 885                 push @moves, [ $pmove, $n, $percent, $rating ];
 886         }
 887
 888         @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
 889
 890         my $text = "Book moves:\n\n              Perf.     N     Rating\n\n";
 891         for my $m (@moves) {
 892                 $text .= sprintf "  %-10s %s   %6u    %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
 893         }
 894
 895         return $text;
 896 }
 897
 898 sub schedule_tb_lookup {
 899         return if (!defined($remoteglotconf::tb_serial_key));
 900         my $pos = $pos_waiting // $pos_calculating;
 901         return if (exists($tb_cache{$pos->fen()}));
 902
 903         # If there's more than seven pieces, there's not going to be an answer,
 904         # so don't bother.
 905         return if ($pos->num_pieces() > 7);
 906
 907         # Max one at a time. If it's still relevant when it returns,
 908         # schedule_tb_lookup() will be called again.
 909         return if ($tb_lookup_running);
 910
 911         $tb_lookup_running = 1;
 912         my $url = 'http://158.250.18.203:6904/tasks/addtask?auth.login=' .
 913                 $remoteglotconf::tb_serial_key .
 914                 '&auth.password=aquarium&type=0&fen=' .
 915                 URI::Escape::uri_escape($pos->fen());
 916         print TBLOG "Downloading $url...\n";
 917         AnyEvent::HTTP::http_get($url, sub {
 918                 handle_tb_lookup_return(@_, $pos, $pos->fen());
 919         });
 920 }
 921
 922 sub handle_tb_lookup_return {
 923         my ($body, $header, $pos, $fen) = @_;
 924         print TBLOG "Response for [$fen]:\n";
 925         print TBLOG $header . "\n\n";
 926         print TBLOG $body . "\n\n";
 927         eval {
 928                 my $response = JSON::XS::decode_json($body);
 929                 if ($response->{'ErrorCode'} != 0) {
 930                         die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
 931                 }
 932                 my $state = $response->{'Response'}{'StateString'};
 933                 if ($state eq 'COMPLETE') {
 934                         my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
 935                         if (!defined($pgn) || !$pgn->read_game()) {
 936                                 warn "Error in parsing PGN\n";
 937                         } else {
 938                                 $pgn->quick_parse_game;
 939                                 my $pvpos = $pos;
 940                                 my $moves = $pgn->moves;
 941                                 my @uci_moves = ();
 942                                 for my $move (@$moves) {
 943                                         my $uci_move;
 944                                         ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
 945                                         push @uci_moves, $uci_move;
 946                                 }
 947                                 $tb_cache{$fen} = {
 948                                         result => $pgn->result,
 949                                         pv => \@uci_moves
 950                                 };
 951                                 output();
 952                         }
 953                 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
 954                         # Try again in a second. Note that if we have changed
 955                         # position in the meantime, we might query a completely
 956                         # different position! But that's fine.
 957                 } else {
 958                         die "Unknown response state " . $state;
 959                 }
 960
 961                 # Wait a second before we schedule another one.
 962                 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
 963                         $tb_lookup_running = 0;
 964                         schedule_tb_lookup();
 965                 });
 966         };
 967         if ($@) {
 968                 warn "Error in tablebase lookup: $@";
 969
 970                 # Don't try this one again, but don't block new lookups either.
 971                 $tb_lookup_running = 0;
 972         }
 973 }
 974
 975 sub open_engine {
 976         my ($cmdline, $tag, $cb) = @_;
 977         return undef if (!defined($cmdline));
 978         return Engine->open($cmdline, $tag, $cb);
 979 }
 980
 981 sub col_letter_to_num {
 982         return ord(shift) - ord('a');
 983 }
 984
 985 sub row_letter_to_num {
 986         return 7 - (ord(shift) - ord('1'));
 987 }
 988
 989 sub parse_uci_move {
 990         my $move = shift;
 991         my $from_col = col_letter_to_num(substr($move, 0, 1));
 992         my $from_row = row_letter_to_num(substr($move, 1, 1));
 993         my $to_col   = col_letter_to_num(substr($move, 2, 1));
 994         my $to_row   = row_letter_to_num(substr($move, 3, 1));
 995         my $promo    = substr($move, 4, 1);
 996         return ($from_col, $from_row, $to_col, $to_row, $promo);
 997 }