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 File::Slurp;
  19 use IPC::Open2;
  20 use Time::HiRes;
  21 use JSON::XS;
  22 use URI::Escape;
  23 use DBI;
  24 use DBD::Pg;
  25 require 'Position.pm';
  26 require 'Engine.pm';
  27 require 'config.pm';
  28 use strict;
  29 use warnings;
  30 no warnings qw(once);
  31
  32 # Program starts here
  33 my $latest_update = undef;
  34 my $output_timer = undef;
  35 my $http_timer = undef;
  36 my $stop_pgn_fetch = 0;
  37 my $tb_retry_timer = undef;
  38 my %tb_cache = ();
  39 my $tb_lookup_running = 0;
  40 my $last_written_json = undef;
  41
  42 # Persisted so we can restart.
  43 # TODO: Figure out an appropriate way to deal with database restarts
  44 # and/or Postgres going away entirely.
  45 my $dbh = DBI->connect($remoteglotconf::dbistr, $remoteglotconf::dbiuser, $remoteglotconf::dbipass)
  46         or die DBI->errstr;
  47 $dbh->{RaiseError} = 1;
  48
  49 $| = 1;
  50
  51 open(FICSLOG, ">ficslog.txt")
  52         or die "ficslog.txt: $!";
  53 print FICSLOG "Log starting.\n";
  54 select(FICSLOG);
  55 $| = 1;
  56
  57 open(UCILOG, ">ucilog.txt")
  58         or die "ucilog.txt: $!";
  59 print UCILOG "Log starting.\n";
  60 select(UCILOG);
  61 $| = 1;
  62
  63 open(TBLOG, ">tblog.txt")
  64         or die "tblog.txt: $!";
  65 print TBLOG "Log starting.\n";
  66 select(TBLOG);
  67 $| = 1;
  68
  69 select(STDOUT);
  70
  71 # open the chess engine
  72 my $engine = open_engine($remoteglotconf::engine_cmdline, 'E1', sub { handle_uci(@_, 1); });
  73 my $engine2 = open_engine($remoteglotconf::engine2_cmdline, 'E2', sub { handle_uci(@_, 0); });
  74 my $last_move;
  75 my $last_text = '';
  76 my ($pos_waiting, $pos_calculating, $pos_calculating_second_engine);
  77
  78 uciprint($engine, "setoption name UCI_AnalyseMode value true");
  79 while (my ($key, $value) = each %remoteglotconf::engine_config) {
  80         uciprint($engine, "setoption name $key value $value");
  81 }
  82 uciprint($engine, "ucinewgame");
  83
  84 if (defined($engine2)) {
  85         uciprint($engine2, "setoption name UCI_AnalyseMode value true");
  86         while (my ($key, $value) = each %remoteglotconf::engine2_config) {
  87                 uciprint($engine2, "setoption name $key value $value");
  88         }
  89         uciprint($engine2, "setoption name MultiPV value 500");
  90         uciprint($engine2, "ucinewgame");
  91 }
  92
  93 print "Chess engine ready.\n";
  94
  95 # now talk to FICS
  96 my $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
  97 $t->input_log(\*FICSLOG);
  98 $t->open($remoteglotconf::server);
  99 $t->print($remoteglotconf::nick);
 100 $t->waitfor('/Press return to enter the server/');
 101 $t->cmd("");
 102
 103 # set some options
 104 $t->cmd("set shout 0");
 105 $t->cmd("set seek 0");
 106 $t->cmd("set style 12");
 107
 108 my $ev1 = AnyEvent->io(
 109         fh => fileno($t),
 110         poll => 'r',
 111         cb => sub {    # what callback to execute
 112                 while (1) {
 113                         my $line = $t->getline(Timeout => 0, errmode => 'return');
 114                         return if (!defined($line));
 115
 116                         chomp $line;
 117                         $line =~ tr/\r//d;
 118                         handle_fics($line);
 119                 }
 120         }
 121 );
 122 if (defined($remoteglotconf::target)) {
 123         if ($remoteglotconf::target =~ /^http:/) {
 124                 fetch_pgn($remoteglotconf::target);
 125         } else {
 126                 $t->cmd("observe $remoteglotconf::target");
 127         }
 128 }
 129 print "FICS ready.\n";
 130
 131 # Engine events have already been set up by Engine.pm.
 132 EV::run;
 133
 134 sub handle_uci {
 135         my ($engine, $line, $primary) = @_;
 136
 137         return if $line =~ /(upper|lower)bound/;
 138
 139         $line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 140         print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
 141         if ($line =~ /^info/) {
 142                 my (@infos) = split / /, $line;
 143                 shift @infos;
 144
 145                 parse_infos($engine, @infos);
 146         }
 147         if ($line =~ /^id/) {
 148                 my (@ids) = split / /, $line;
 149                 shift @ids;
 150
 151                 parse_ids($engine, @ids);
 152         }
 153         if ($line =~ /^bestmove/) {
 154                 if ($primary) {
 155                         return if (!$remoteglotconf::uci_assume_full_compliance);
 156                         if (defined($pos_waiting)) {
 157                                 uciprint($engine, "position fen " . $pos_waiting->fen());
 158                                 uciprint($engine, "go infinite");
 159
 160                                 $pos_calculating = $pos_waiting;
 161                                 $pos_waiting = undef;
 162                         }
 163                 } else {
 164                         $engine2->{'info'} = {};
 165                         my $pos = $pos_waiting // $pos_calculating;
 166                         uciprint($engine2, "position fen " . $pos->fen());
 167                         uciprint($engine2, "go infinite");
 168                         $pos_calculating_second_engine = $pos;
 169                 }
 170         }
 171         output();
 172 }
 173
 174 my $getting_movelist = 0;
 175 my $pos_for_movelist = undef;
 176 my @uci_movelist = ();
 177 my @pretty_movelist = ();
 178
 179 sub handle_fics {
 180         my $line = shift;
 181         if ($line =~ /^<12> /) {
 182                 handle_position(Position->new($line));
 183                 $t->cmd("moves");
 184         }
 185         if ($line =~ /^Movelist for game /) {
 186                 my $pos = $pos_waiting // $pos_calculating;
 187                 if (defined($pos)) {
 188                         @uci_movelist = ();
 189                         @pretty_movelist = ();
 190                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 191                         $getting_movelist = 1;
 192                 }
 193         }
 194         if ($getting_movelist &&
 195             $line =~ /^\s* \d+\. \s+                     # move number
 196                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 197                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 198                      /x) {
 199                 eval {
 200                         my $uci_move;
 201                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 202                         push @uci_movelist, $uci_move;
 203                         push @pretty_movelist, $1;
 204
 205                         if (defined($2)) {
 206                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 207                                 push @uci_movelist, $uci_move;
 208                                 push @pretty_movelist, $2;
 209                         }
 210                 };
 211                 if ($@) {
 212                         warn "Error when getting FICS move history: $@";
 213                         $getting_movelist = 0;
 214                 }
 215         }
 216         if ($getting_movelist &&
 217             $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
 218                 # End of movelist.
 219                 for my $pos ($pos_waiting, $pos_calculating) {
 220                         next if (!defined($pos));
 221                         if ($pos->fen() eq $pos_for_movelist->fen()) {
 222                                 $pos->{'pretty_history'} = \@pretty_movelist;
 223                         }
 224                 }
 225                 $getting_movelist = 0;
 226         }
 227         if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 228                 my ($who, $msg) = ($1, $2);
 229
 230                 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
 231
 232                 if ($msg =~ /^fics (.*?)$/) {
 233                         $t->cmd("tell $who Executing '$1' on FICS.");
 234                         $t->cmd($1);
 235                 } elsif ($msg =~ /^uci (.*?)$/) {
 236                         $t->cmd("tell $who Sending '$1' to the engine.");
 237                         print { $engine->{'write'} } "$1\n";
 238                 } elsif ($msg =~ /^pgn (.*?)$/) {
 239                         my $url = $1;
 240                         $t->cmd("tell $who Starting to poll '$url'.");
 241                         fetch_pgn($url);
 242                 } elsif ($msg =~ /^stoppgn$/) {
 243                         $t->cmd("tell $who Stopping poll.");
 244                         $stop_pgn_fetch = 1;
 245                         $http_timer = undef;
 246                 } elsif ($msg =~ /^quit$/) {
 247                         $t->cmd("tell $who Bye bye.");
 248                         exit;
 249                 } else {
 250                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 251                 }
 252         }
 253         #print "FICS: [$line]\n";
 254 }
 255
 256 # Starts periodic fetching of PGNs from the given URL.
 257 sub fetch_pgn {
 258         my ($url) = @_;
 259         AnyEvent::HTTP::http_get($url, sub {
 260                 handle_pgn(@_, $url);
 261         });
 262 }
 263
 264 my ($last_pgn_white, $last_pgn_black);
 265 my @last_pgn_uci_moves = ();
 266 my $pgn_hysteresis_counter = 0;
 267
 268 sub handle_pgn {
 269         my ($body, $header, $url) = @_;
 270
 271         if ($stop_pgn_fetch) {
 272                 $stop_pgn_fetch = 0;
 273                 $http_timer = undef;
 274                 return;
 275         }
 276
 277         my $pgn = Chess::PGN::Parse->new(undef, $body);
 278         if (!defined($pgn) || !$pgn->read_game() || $body !~ /^\[/) {
 279                 warn "Error in parsing PGN from $url\n";
 280         } else {
 281                 eval {
 282                         # Skip to the right game.
 283                         while (defined($remoteglotconf::pgn_filter) &&
 284                                !&$remoteglotconf::pgn_filter($pgn)) {
 285                                 $pgn->read_game() or die "Out of games during filtering";
 286                         }
 287
 288                         $pgn->parse_game({ save_comments => 'yes' });
 289                         my $pos = Position->start_pos($pgn->white, $pgn->black);
 290                         my $moves = $pgn->moves;
 291                         my @uci_moves = ();
 292                         for my $move (@$moves) {
 293                                 my $uci_move;
 294                                 ($pos, $uci_move) = $pos->make_pretty_move($move);
 295                                 push @uci_moves, $uci_move;
 296                         }
 297                         $pos->{'result'} = $pgn->result;
 298                         $pos->{'pretty_history'} = $moves;
 299
 300                         extract_clock($pgn, $pos);
 301
 302                         # Sometimes, PGNs lose a move or two for a short while,
 303                         # or people push out new ones non-atomically.
 304                         # Thus, if we PGN doesn't change names but becomes
 305                         # shorter, we mistrust it for a few seconds.
 306                         my $trust_pgn = 1;
 307                         if (defined($last_pgn_white) && defined($last_pgn_black) &&
 308                             $last_pgn_white eq $pgn->white &&
 309                             $last_pgn_black eq $pgn->black &&
 310                             scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 311                                 if (++$pgn_hysteresis_counter < 3) {
 312                                         $trust_pgn = 0;
 313                                 }
 314                         }
 315                         if ($trust_pgn) {
 316                                 $last_pgn_white = $pgn->white;
 317                                 $last_pgn_black = $pgn->black;
 318                                 @last_pgn_uci_moves = @uci_moves;
 319                                 $pgn_hysteresis_counter = 0;
 320                                 handle_position($pos);
 321                         }
 322                 };
 323                 if ($@) {
 324                         warn "Error in parsing moves from $url: $@\n";
 325                 }
 326         }
 327
 328         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 329                 fetch_pgn($url);
 330         });
 331 }
 332
 333 sub handle_position {
 334         my ($pos) = @_;
 335         find_clock_start($pos, $pos_calculating);
 336
 337         # if this is already in the queue, ignore it (just update the result)
 338         if (defined($pos_waiting) && $pos->fen() eq $pos_waiting->fen()) {
 339                 $pos_waiting->{'result'} = $pos->{'result'};
 340                 return;
 341         }
 342
 343         # if we're already chewing on this and there's nothing else in the queue,
 344         # also ignore it
 345         if (!defined($pos_waiting) && defined($pos_calculating) &&
 346             $pos->fen() eq $pos_calculating->fen()) {
 347                 $pos_calculating->{'result'} = $pos->{'result'};
 348                 return;
 349         }
 350
 351         # if we're already thinking on something, stop and wait for the engine
 352         # to approve
 353         if (defined($pos_calculating)) {
 354                 # Store the final data we have for this position in the history,
 355                 # with the precise clock information we just got from the new
 356                 # position. (Historic positions store the clock at the end of
 357                 # the position.)
 358                 #
 359                 # Do not output anything new to the main analysis; that's
 360                 # going to be obsolete really soon.
 361                 $pos_calculating->{'white_clock'} = $pos->{'white_clock'};
 362                 $pos_calculating->{'black_clock'} = $pos->{'black_clock'};
 363                 delete $pos_calculating->{'white_clock_target'};
 364                 delete $pos_calculating->{'black_clock_target'};
 365                 output_json(1);
 366
 367                 if (!defined($pos_waiting)) {
 368                         uciprint($engine, "stop");
 369                 }
 370                 if ($remoteglotconf::uci_assume_full_compliance) {
 371                         $pos_waiting = $pos;
 372                 } else {
 373                         uciprint($engine, "position fen " . $pos->fen());
 374                         uciprint($engine, "go infinite");
 375                         $pos_calculating = $pos;
 376                 }
 377         } else {
 378                 # it's wrong just to give the FEN (the move history is useful,
 379                 # and per the UCI spec, we should really have sent "ucinewgame"),
 380                 # but it's easier
 381                 uciprint($engine, "position fen " . $pos->fen());
 382                 uciprint($engine, "go infinite");
 383                 $pos_calculating = $pos;
 384         }
 385
 386         if (defined($engine2)) {
 387                 if (defined($pos_calculating_second_engine)) {
 388                         uciprint($engine2, "stop");
 389                 } else {
 390                         uciprint($engine2, "position fen " . $pos->fen());
 391                         uciprint($engine2, "go infinite");
 392                         $pos_calculating_second_engine = $pos;
 393                 }
 394                 $engine2->{'info'} = {};
 395         }
 396
 397         $engine->{'info'} = {};
 398         $last_move = time;
 399
 400         schedule_tb_lookup();
 401
 402         #
 403         # Output a command every move to note that we're
 404         # still paying attention -- this is a good tradeoff,
 405         # since if no move has happened in the last half
 406         # hour, the analysis/relay has most likely stopped
 407         # and we should stop hogging server resources.
 408         #
 409         $t->cmd("date");
 410 }
 411
 412 sub parse_infos {
 413         my ($engine, @x) = @_;
 414         my $mpv = '';
 415
 416         my $info = $engine->{'info'};
 417
 418         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 419         for my $i (0..$#x - 1) {
 420                 if ($x[$i] eq 'multipv') {
 421                         $mpv = $x[$i + 1];
 422                         next;
 423                 }
 424         }
 425
 426         while (scalar @x > 0) {
 427                 if ($x[0] eq 'multipv') {
 428                         # Dealt with above
 429                         shift @x;
 430                         shift @x;
 431                         next;
 432                 }
 433                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 434                         my $key = shift @x;
 435                         my $value = shift @x;
 436                         $info->{$key} = $value;
 437                         next;
 438                 }
 439                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 440                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 441                     $x[0] eq 'tbhits') {
 442                         my $key = shift @x;
 443                         my $value = shift @x;
 444                         $info->{$key . $mpv} = $value;
 445                         next;
 446                 }
 447                 if ($x[0] eq 'score') {
 448                         shift @x;
 449
 450                         delete $info->{'score_cp' . $mpv};
 451                         delete $info->{'score_mate' . $mpv};
 452
 453                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 454                                 if ($x[0] eq 'cp') {
 455                                         shift @x;
 456                                         $info->{'score_cp' . $mpv} = shift @x;
 457                                 } elsif ($x[0] eq 'mate') {
 458                                         shift @x;
 459                                         $info->{'score_mate' . $mpv} = shift @x;
 460                                 } else {
 461                                         shift @x;
 462                                 }
 463                         }
 464                         next;
 465                 }
 466                 if ($x[0] eq 'pv') {
 467                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 468                         last;
 469                 }
 470                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 471                         last;
 472                 }
 473
 474                 #print "unknown info '$x[0]', trying to recover...\n";
 475                 #shift @x;
 476                 die "Unknown info '" . join(',', @x) . "'";
 477
 478         }
 479 }
 480
 481 sub parse_ids {
 482         my ($engine, @x) = @_;
 483
 484         while (scalar @x > 0) {
 485                 if ($x[0] eq 'name') {
 486                         my $value = join(' ', @x);
 487                         $engine->{'id'}{'author'} = $value;
 488                         last;
 489                 }
 490
 491                 # unknown
 492                 shift @x;
 493         }
 494 }
 495
 496 sub prettyprint_pv_no_cache {
 497         my ($board, @pvs) = @_;
 498
 499         if (scalar @pvs == 0 || !defined($pvs[0])) {
 500                 return ();
 501         }
 502
 503         my $pv = shift @pvs;
 504         my ($from_col, $from_row, $to_col, $to_row, $promo) = parse_uci_move($pv);
 505         my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 506         return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
 507 }
 508
 509 sub prettyprint_pv {
 510         my ($pos, @pvs) = @_;
 511
 512         my $cachekey = join('', @pvs);
 513         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 514                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 515         } else {
 516                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 517                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 518                 return @res;
 519         }
 520 }
 521
 522 sub output {
 523         #return;
 524
 525         return if (!defined($pos_calculating));
 526
 527         # Don't update too often.
 528         my $age = Time::HiRes::tv_interval($latest_update);
 529         if ($age < $remoteglotconf::update_max_interval) {
 530                 my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
 531                 $output_timer = AnyEvent->timer(after => $wait, cb => \&output);
 532                 return;
 533         }
 534
 535         my $info = $engine->{'info'};
 536
 537         #
 538         # If we have tablebase data from a previous lookup, replace the
 539         # engine data with the data from the tablebase.
 540         #
 541         my $fen = $pos_calculating->fen();
 542         if (exists($tb_cache{$fen})) {
 543                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 544                         delete $info->{$key . '1'};
 545                         delete $info->{$key};
 546                 }
 547                 $info->{'nodes'} = 0;
 548                 $info->{'nps'} = 0;
 549                 $info->{'depth'} = 0;
 550                 $info->{'seldepth'} = 0;
 551                 $info->{'tbhits'} = 0;
 552
 553                 my $t = $tb_cache{$fen};
 554                 my $pv = $t->{'pv'};
 555                 my $matelen = int((1 + $t->{'score'}) / 2);
 556                 if ($t->{'result'} eq '1/2-1/2') {
 557                         $info->{'score_cp'} = 0;
 558                 } elsif ($t->{'result'} eq '1-0') {
 559                         if ($pos_calculating->{'toplay'} eq 'B') {
 560                                 $info->{'score_mate'} = -$matelen;
 561                         } else {
 562                                 $info->{'score_mate'} = $matelen;
 563                         }
 564                 } else {
 565                         if ($pos_calculating->{'toplay'} eq 'B') {
 566                                 $info->{'score_mate'} = $matelen;
 567                         } else {
 568                                 $info->{'score_mate'} = -$matelen;
 569                         }
 570                 }
 571                 $info->{'pv'} = $pv;
 572                 $info->{'tablebase'} = 1;
 573         } else {
 574                 $info->{'tablebase'} = 0;
 575         }
 576
 577         #
 578         # Some programs _always_ report MultiPV, even with only one PV.
 579         # In this case, we simply use that data as if MultiPV was never
 580         # specified.
 581         #
 582         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 583                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 584                         if (exists($info->{$key . '1'})) {
 585                                 $info->{$key} = $info->{$key . '1'};
 586                         }
 587                 }
 588         }
 589
 590         #
 591         # Check the PVs first. if they're invalid, just wait, as our data
 592         # is most likely out of sync. This isn't a very good solution, as
 593         # it can frequently miss stuff, but it's good enough for most users.
 594         #
 595         eval {
 596                 my $dummy;
 597                 if (exists($info->{'pv'})) {
 598                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 599                 }
 600
 601                 my $mpv = 1;
 602                 while (exists($info->{'pv' . $mpv})) {
 603                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 604                         ++$mpv;
 605                 }
 606         };
 607         if ($@) {
 608                 $engine->{'info'} = {};
 609                 return;
 610         }
 611
 612         output_screen();
 613         output_json(0);
 614         $latest_update = [Time::HiRes::gettimeofday];
 615 }
 616
 617 sub output_screen {
 618         my $info = $engine->{'info'};
 619         my $id = $engine->{'id'};
 620
 621         my $text = 'Analysis';
 622         if ($pos_calculating->{'last_move'} ne 'none') {
 623                 if ($pos_calculating->{'toplay'} eq 'W') {
 624                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 625                 } else {
 626                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 627                 }
 628                 if (exists($id->{'name'})) {
 629                         $text .= ',';
 630                 }
 631         }
 632
 633         if (exists($id->{'name'})) {
 634                 $text .= " by $id->{'name'}:\n\n";
 635         } else {
 636                 $text .= ":\n\n";
 637         }
 638
 639         return unless (exists($pos_calculating->{'board'}));
 640
 641         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 642                 # multi-PV
 643                 my $mpv = 1;
 644                 while (exists($info->{'pv' . $mpv})) {
 645                         $text .= sprintf "  PV%2u", $mpv;
 646                         my $score = short_score($info, $pos_calculating, $mpv);
 647                         $text .= "  ($score)" if (defined($score));
 648
 649                         my $tbhits = '';
 650                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 651                                 if ($info->{'tbhits' . $mpv} == 1) {
 652                                         $tbhits = ", 1 tbhit";
 653                                 } else {
 654                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 655                                 }
 656                         }
 657
 658                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 659                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 660                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 661                         }
 662
 663                         $text .= ":\n";
 664                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 665                         $text .= "\n";
 666                         ++$mpv;
 667                 }
 668         } else {
 669                 # single-PV
 670                 my $score = long_score($info, $pos_calculating, '');
 671                 $text .= "  $score\n" if defined($score);
 672                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 673                 $text .=  "\n";
 674
 675                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 676                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 677                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 678                 }
 679                 if (exists($info->{'seldepth'})) {
 680                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 681                 }
 682                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 683                         if ($info->{'tbhits'} == 1) {
 684                                 $text .= ", one Syzygy hit";
 685                         } else {
 686                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 687                         }
 688                 }
 689                 $text .= "\n\n";
 690         }
 691
 692         #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
 693
 694         my @refutation_lines = ();
 695         if (defined($engine2)) {
 696                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 697                         my $info = $engine2->{'info'};
 698                         last if (!exists($info->{'pv' . $mpv}));
 699                         eval {
 700                                 my $pv = $info->{'pv' . $mpv};
 701
 702                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 703                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 704                                 if (scalar @pretty_pv > 5) {
 705                                         @pretty_pv = @pretty_pv[0..4];
 706                                         push @pretty_pv, "...";
 707                                 }
 708                                 my $key = $pretty_move;
 709                                 my $line = sprintf("  %-6s %6s %3s  %s",
 710                                         $pretty_move,
 711                                         short_score($info, $pos_calculating_second_engine, $mpv),
 712                                         "d" . $info->{'depth' . $mpv},
 713                                         join(', ', @pretty_pv));
 714                                 push @refutation_lines, [ $key, $line ];
 715                         };
 716                 }
 717         }
 718
 719         if ($#refutation_lines >= 0) {
 720                 $text .= "Shallow search of all legal moves:\n\n";
 721                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 722                         $text .= $line->[1] . "\n";
 723                 }
 724                 $text .= "\n\n";
 725         }
 726
 727         if ($last_text ne $text) {
 728                 print "\e[H\e[2J"; # clear the screen
 729                 print $text;
 730                 $last_text = $text;
 731         }
 732 }
 733
 734 sub output_json {
 735         my $historic_json_only = shift;
 736         my $info = $engine->{'info'};
 737
 738         my $json = {};
 739         $json->{'position'} = $pos_calculating->to_json_hash();
 740         $json->{'engine'} = $engine->{'id'};
 741         if (defined($remoteglotconf::engine_url)) {
 742                 $json->{'engine'}{'url'} = $remoteglotconf::engine_url;
 743         }
 744         if (defined($remoteglotconf::engine_details)) {
 745                 $json->{'engine'}{'details'} = $remoteglotconf::engine_details;
 746         }
 747         if (defined($remoteglotconf::move_source)) {
 748                 $json->{'move_source'} = $remoteglotconf::move_source;
 749         }
 750         if (defined($remoteglotconf::move_source_url)) {
 751                 $json->{'move_source_url'} = $remoteglotconf::move_source_url;
 752         }
 753         $json->{'score'} = long_score($info, $pos_calculating, '');
 754         $json->{'short_score'} = short_score($info, $pos_calculating, '');
 755         $json->{'plot_score'} = plot_score($info, $pos_calculating, '');
 756         $json->{'using_lomonosov'} = defined($remoteglotconf::tb_serial_key);
 757
 758         $json->{'nodes'} = $info->{'nodes'};
 759         $json->{'nps'} = $info->{'nps'};
 760         $json->{'depth'} = $info->{'depth'};
 761         $json->{'tbhits'} = $info->{'tbhits'};
 762         $json->{'seldepth'} = $info->{'seldepth'};
 763         $json->{'tablebase'} = $info->{'tablebase'};
 764
 765         $json->{'pv_uci'} = $info->{'pv'};  # Still needs to be there for the JS to calculate arrows; only for the primary PV, though!
 766         $json->{'pv_pretty'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 767
 768         my %refutation_lines = ();
 769         my @refutation_lines = ();
 770         if (defined($engine2)) {
 771                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 772                         my $info = $engine2->{'info'};
 773                         my $pretty_move = "";
 774                         my @pretty_pv = ();
 775                         last if (!exists($info->{'pv' . $mpv}));
 776
 777                         eval {
 778                                 my $pv = $info->{'pv' . $mpv};
 779                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 780                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 781                                 $refutation_lines{$pv->[0]} = {
 782                                         sort_key => $pretty_move,
 783                                         depth => $info->{'depth' . $mpv},
 784                                         score_sort_key => score_sort_key($info, $pos_calculating, $mpv, 0),
 785                                         pretty_score => short_score($info, $pos_calculating, $mpv),
 786                                         pretty_move => $pretty_move,
 787                                         pv_pretty => \@pretty_pv,
 788                                 };
 789                         };
 790                 }
 791         }
 792         $json->{'refutation_lines'} = \%refutation_lines;
 793
 794         # Piece together historic score information, to the degree we have it.
 795         if (!$historic_json_only && exists($pos_calculating->{'pretty_history'})) {
 796                 my %score_history = ();
 797
 798                 my $q = $dbh->prepare('SELECT * FROM scores WHERE id=?');
 799                 my $pos = Position->start_pos('white', 'black');
 800                 my $halfmove_num = 0;
 801                 for my $move (@{$pos_calculating->{'pretty_history'}}) {
 802                         my $id = id_for_pos($pos, $halfmove_num);
 803                         my $ref = $dbh->selectrow_hashref($q, undef, $id);
 804                         if (defined($ref)) {
 805                                 $score_history{$halfmove_num} = [
 806                                         $ref->{'plot_score'},
 807                                         $ref->{'short_score'}
 808                                 ];
 809                         }
 810                         ++$halfmove_num;
 811                         ($pos) = $pos->make_pretty_move($move);
 812                 }
 813                 $q->finish;
 814
 815                 # If at any point we are missing 10 consecutive moves,
 816                 # truncate the history there. This is so we don't get into
 817                 # a situation where we e.g. start analyzing at move 45,
 818                 # but we have analysis for 1. e4 from some completely different game
 819                 # and thus show a huge hole.
 820                 my $consecutive_missing = 0;
 821                 my $truncate_until = 0;
 822                 for (my $i = $halfmove_num; $i --> 0; ) {
 823                         if ($consecutive_missing >= 10) {
 824                                 delete $score_history{$i};
 825                                 next;
 826                         }
 827                         if (exists($score_history{$i})) {
 828                                 $consecutive_missing = 0;
 829                         } else {
 830                                 ++$consecutive_missing;
 831                         }
 832                 }
 833
 834                 $json->{'score_history'} = \%score_history;
 835         }
 836
 837         # Give out a list of other games going on. (Empty is fine.)
 838         if (!$historic_json_only) {
 839                 my @games = ();
 840
 841                 my $q = $dbh->prepare('SELECT * FROM current_games ORDER BY priority DESC, id');
 842                 $q->execute;
 843                 while (my $ref = $q->fetchrow_hashref) {
 844                         eval {
 845                                 my $other_game_contents = File::Slurp::read_file($ref->{'json_path'});
 846                                 my $other_game_json = JSON::XS::decode_json($other_game_contents);
 847
 848                                 die "Missing position" if (!exists($other_game_json->{'position'}));
 849                                 my $white = $other_game_json->{'position'}{'player_w'} // die 'Missing white';
 850                                 my $black = $other_game_json->{'position'}{'player_b'} // die 'Missing black';
 851
 852                                 push @games, {
 853                                         id => $ref->{'id'},
 854                                         name => "$white–$black",
 855                                         url => $ref->{'url'}
 856                                 };
 857                         };
 858                         if ($@) {
 859                                 warn "Could not add external game " . $ref->{'json_path'} . ": $@";
 860                         }
 861                 }
 862
 863                 if (scalar @games > 0) {
 864                         $json->{'games'} = \@games;
 865                 }
 866         }
 867
 868         my $json_enc = JSON::XS->new;
 869         $json_enc->canonical(1);
 870         my $encoded = $json_enc->encode($json);
 871         unless ($historic_json_only || !defined($remoteglotconf::json_output) ||
 872                 (defined($last_written_json) && $last_written_json eq $encoded)) {
 873                 atomic_set_contents($remoteglotconf::json_output, $encoded);
 874                 $last_written_json = $encoded;
 875         }
 876
 877         if (exists($pos_calculating->{'pretty_history'}) &&
 878             defined($remoteglotconf::json_history_dir)) {
 879                 my $id = id_for_pos($pos_calculating);
 880                 my $filename = $remoteglotconf::json_history_dir . "/" . $id . ".json";
 881
 882                 # Overwrite old analysis (assuming it exists at all) if we're
 883                 # using a different engine, or if we've calculated deeper.
 884                 # nodes is used as a tiebreaker. Don't bother about Multi-PV
 885                 # data; it's not that important.
 886                 my ($old_engine, $old_depth, $old_nodes) = get_json_analysis_stats($id);
 887                 my $new_depth = $json->{'depth'} // 0;
 888                 my $new_nodes = $json->{'nodes'} // 0;
 889                 if (!defined($old_engine) ||
 890                     $old_engine ne $json->{'engine'}{'name'} ||
 891                     $new_depth > $old_depth ||
 892                     ($new_depth == $old_depth && $new_nodes >= $old_nodes)) {
 893                         atomic_set_contents($filename, $encoded);
 894                         if (defined($json->{'plot_score'})) {
 895                                 local $dbh->{AutoCommit} = 0;
 896                                 $dbh->do('DELETE FROM scores WHERE id=?', undef, $id);
 897                                 $dbh->do('INSERT INTO scores (id, plot_score, short_score, engine, depth, nodes) VALUES (?,?,?,?,?,?)', undef,
 898                                         $id, $json->{'plot_score'}, $json->{'short_score'},
 899                                         $json->{'engine'}{'name'}, $new_depth, $new_nodes);
 900                                 $dbh->commit;
 901                         }
 902                 }
 903         }
 904 }
 905
 906 sub atomic_set_contents {
 907         my ($filename, $contents) = @_;
 908
 909         open my $fh, ">", $filename . ".tmp"
 910                 or return;
 911         print $fh $contents;
 912         close $fh;
 913         rename($filename . ".tmp", $filename);
 914 }
 915
 916 sub id_for_pos {
 917         my ($pos, $halfmove_num) = @_;
 918
 919         $halfmove_num //= scalar @{$pos->{'pretty_history'}};
 920         (my $fen = $pos->fen()) =~ tr,/ ,-_,;
 921         return "move$halfmove_num-$fen";
 922 }
 923
 924 sub get_json_analysis_stats {
 925         my $id = shift;
 926         my $ref = $dbh->selectrow_hashref('SELECT * FROM scores WHERE id=?', undef, $id);
 927         if (defined($ref)) {
 928                 return ($ref->{'engine'}, $ref->{'depth'}, $ref->{'nodes'});
 929         } else {
 930                 return ('', 0, 0);
 931         }
 932 }
 933
 934 sub uciprint {
 935         my ($engine, $msg) = @_;
 936         $engine->print($msg);
 937         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
 938 }
 939
 940 sub short_score {
 941         my ($info, $pos, $mpv) = @_;
 942
 943         my $invert = ($pos->{'toplay'} eq 'B');
 944         if (defined($info->{'score_mate' . $mpv})) {
 945                 if ($invert) {
 946                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
 947                 } else {
 948                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
 949                 }
 950         } else {
 951                 if (exists($info->{'score_cp' . $mpv})) {
 952                         my $score = $info->{'score_cp' . $mpv} * 0.01;
 953                         if ($score == 0) {
 954                                 if ($info->{'tablebase'}) {
 955                                         return "TB draw";
 956                                 } else {
 957                                         return " 0.00";
 958                                 }
 959                         }
 960                         if ($invert) {
 961                                 $score = -$score;
 962                         }
 963                         return sprintf "%+5.2f", $score;
 964                 }
 965         }
 966
 967         return undef;
 968 }
 969
 970 sub score_sort_key {
 971         my ($info, $pos, $mpv, $invert) = @_;
 972
 973         if (defined($info->{'score_mate' . $mpv})) {
 974                 my $mate = $info->{'score_mate' . $mpv};
 975                 my $score;
 976                 if ($mate > 0) {
 977                         # Side to move mates
 978                         $score = 99999 - $mate;
 979                 } else {
 980                         # Side to move is getting mated (note the double negative for $mate)
 981                         $score = -99999 - $mate;
 982                 }
 983                 if ($invert) {
 984                         $score = -$score;
 985                 }
 986                 return $score;
 987         } else {
 988                 if (exists($info->{'score_cp' . $mpv})) {
 989                         my $score = $info->{'score_cp' . $mpv};
 990                         if ($invert) {
 991                                 $score = -$score;
 992                         }
 993                         return $score;
 994                 }
 995         }
 996
 997         return undef;
 998 }
 999
1000 sub long_score {
1001         my ($info, $pos, $mpv) = @_;
1002
1003         if (defined($info->{'score_mate' . $mpv})) {
1004                 my $mate = $info->{'score_mate' . $mpv};
1005                 if ($pos->{'toplay'} eq 'B') {
1006                         $mate = -$mate;
1007                 }
1008                 if ($mate > 0) {
1009                         return sprintf "White mates in %u", $mate;
1010                 } else {
1011                         return sprintf "Black mates in %u", -$mate;
1012                 }
1013         } else {
1014                 if (exists($info->{'score_cp' . $mpv})) {
1015                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1016                         if ($score == 0) {
1017                                 if ($info->{'tablebase'}) {
1018                                         return "Theoretical draw";
1019                                 } else {
1020                                         return "Score:  0.00";
1021                                 }
1022                         }
1023                         if ($pos->{'toplay'} eq 'B') {
1024                                 $score = -$score;
1025                         }
1026                         return sprintf "Score: %+5.2f", $score;
1027                 }
1028         }
1029
1030         return undef;
1031 }
1032
1033 # For graphs; a single number in centipawns, capped at +/- 500.
1034 sub plot_score {
1035         my ($info, $pos, $mpv) = @_;
1036
1037         my $invert = ($pos->{'toplay'} eq 'B');
1038         if (defined($info->{'score_mate' . $mpv})) {
1039                 my $mate = $info->{'score_mate' . $mpv};
1040                 if ($invert) {
1041                         $mate = -$mate;
1042                 }
1043                 if ($mate > 0) {
1044                         return 500;
1045                 } else {
1046                         return -500;
1047                 }
1048         } else {
1049                 if (exists($info->{'score_cp' . $mpv})) {
1050                         my $score = $info->{'score_cp' . $mpv};
1051                         if ($invert) {
1052                                 $score = -$score;
1053                         }
1054                         $score = 500 if ($score > 500);
1055                         $score = -500 if ($score < -500);
1056                         return int($score);
1057                 }
1058         }
1059
1060         return undef;
1061 }
1062
1063 my %book_cache = ();
1064 sub book_info {
1065         my ($fen, $board, $toplay) = @_;
1066
1067         if (exists($book_cache{$fen})) {
1068                 return $book_cache{$fen};
1069         }
1070
1071         my $ret = `./booklook $fen`;
1072         return "" if ($ret =~ /Not found/ || $ret eq '');
1073
1074         my @moves = ();
1075
1076         for my $m (split /\n/, $ret) {
1077                 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
1078
1079                 my $pmove;
1080                 if ($move eq '')  {
1081                         $pmove = '(current)';
1082                 } else {
1083                         ($pmove) = prettyprint_pv_no_cache($board, $move);
1084                         $pmove .= $annotation;
1085                 }
1086
1087                 my $score;
1088                 if ($toplay eq 'W') {
1089                         $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
1090                 } else {
1091                         $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
1092                 }
1093                 my $n = $win + $draw + $lose;
1094
1095                 my $percent;
1096                 if ($n == 0) {
1097                         $percent = "     ";
1098                 } else {
1099                         $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
1100                 }
1101
1102                 push @moves, [ $pmove, $n, $percent, $rating ];
1103         }
1104
1105         @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
1106
1107         my $text = "Book moves:\n\n              Perf.     N     Rating\n\n";
1108         for my $m (@moves) {
1109                 $text .= sprintf "  %-10s %s   %6u    %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
1110         }
1111
1112         return $text;
1113 }
1114
1115 sub extract_clock {
1116         my ($pgn, $pos) = @_;
1117
1118         # Look for extended PGN clock tags.
1119         my $tags = $pgn->tags;
1120         if (exists($tags->{'WhiteClock'}) && exists($tags->{'BlackClock'})) {
1121                 $pos->{'white_clock'} = hms_to_sec($tags->{'WhiteClock'});
1122                 $pos->{'black_clock'} = hms_to_sec($tags->{'BlackClock'});
1123                 return;
1124         }
1125
1126         # Look for TCEC-style time comments.
1127         my $moves = $pgn->moves;
1128         my $comments = $pgn->comments;
1129         my $last_black_move = int((scalar @$moves) / 2);
1130         my $last_white_move = int((1 + scalar @$moves) / 2);
1131
1132         my $black_key = $last_black_move . "b";
1133         my $white_key = $last_white_move . "w";
1134
1135         if (exists($comments->{$white_key}) &&
1136             exists($comments->{$black_key}) &&
1137             $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/ &&
1138             $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/) {
1139                 $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1140                 $pos->{'white_clock'} = hms_to_sec($1);
1141                 $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1142                 $pos->{'black_clock'} = hms_to_sec($1);
1143                 return;
1144         }
1145
1146         delete $pos->{'white_clock'};
1147         delete $pos->{'black_clock'};
1148 }
1149
1150 sub hms_to_sec {
1151         my $hms = shift;
1152         return undef if (!defined($hms));
1153         $hms =~ /(\d+):(\d+):(\d+)/;
1154         return $1 * 3600 + $2 * 60 + $3;
1155 }
1156
1157 sub find_clock_start {
1158         my ($pos, $prev_pos) = @_;
1159
1160         # If the game is over, the clock is stopped.
1161         if (exists($pos->{'result'}) &&
1162             ($pos->{'result'} eq '1-0' ||
1163              $pos->{'result'} eq '1/2-1/2' ||
1164              $pos->{'result'} eq '0-1')) {
1165                 return;
1166         }
1167
1168         # When we don't have any moves, we assume the clock hasn't started yet.
1169         if ($pos->{'move_num'} == 1 && $pos->{'toplay'} eq 'W') {
1170                 if (defined($remoteglotconf::adjust_clocks_before_move)) {
1171                         &$remoteglotconf::adjust_clocks_before_move(\$pos->{'white_clock'}, \$pos->{'black_clock'}, 1, 'W');
1172                 }
1173                 return;
1174         }
1175
1176         # TODO(sesse): Maybe we can get the number of moves somehow else for FICS games.
1177         # The history is needed for id_for_pos.
1178         if (!exists($pos->{'pretty_history'})) {
1179                 return;
1180         }
1181
1182         my $id = id_for_pos($pos);
1183         my $clock_info = $dbh->selectrow_hashref('SELECT * FROM clock_info WHERE id=?', undef, $id);
1184         if (defined($clock_info)) {
1185                 $pos->{'white_clock'} //= $clock_info->{'white_clock'};
1186                 $pos->{'black_clock'} //= $clock_info->{'black_clock'};
1187                 if ($pos->{'toplay'} eq 'W') {
1188                         $pos->{'white_clock_target'} = $clock_info->{'white_clock_target'};
1189                 } else {
1190                         $pos->{'black_clock_target'} = $clock_info->{'black_clock_target'};
1191                 }
1192                 return;
1193         }
1194
1195         # OK, we haven't seen this position before, so we assume the move
1196         # happened right now.
1197
1198         # See if we should do our own clock management (ie., clock information
1199         # is spurious or non-existent).
1200         if (defined($remoteglotconf::adjust_clocks_before_move)) {
1201                 my $wc = $pos->{'white_clock'} // $prev_pos->{'white_clock'};
1202                 my $bc = $pos->{'black_clock'} // $prev_pos->{'black_clock'};
1203                 if (defined($prev_pos->{'white_clock_target'})) {
1204                         $wc = $prev_pos->{'white_clock_target'} - time;
1205                 }
1206                 if (defined($prev_pos->{'black_clock_target'})) {
1207                         $bc = $prev_pos->{'black_clock_target'} - time;
1208                 }
1209                 &$remoteglotconf::adjust_clocks_before_move(\$wc, \$bc, $pos->{'move_num'}, $pos->{'toplay'});
1210                 $pos->{'white_clock'} = $wc;
1211                 $pos->{'black_clock'} = $bc;
1212         }
1213
1214         my $key = ($pos->{'toplay'} eq 'W') ? 'white_clock' : 'black_clock';
1215         if (!exists($pos->{$key})) {
1216                 # No clock information.
1217                 return;
1218         }
1219         my $time_left = $pos->{$key};
1220         my ($white_clock_target, $black_clock_target);
1221         if ($pos->{'toplay'} eq 'W') {
1222                 $white_clock_target = $pos->{'white_clock_target'} = time + $time_left;
1223         } else {
1224                 $black_clock_target = $pos->{'black_clock_target'} = time + $time_left;
1225         }
1226         local $dbh->{AutoCommit} = 0;
1227         $dbh->do('DELETE FROM clock_info WHERE id=?', undef, $id);
1228         $dbh->do('INSERT INTO clock_info (id, white_clock, black_clock, white_clock_target, black_clock_target) VALUES (?, ?, ?, ?, ?)', undef,
1229                 $id, $pos->{'white_clock'}, $pos->{'black_clock'}, $white_clock_target, $black_clock_target);
1230         $dbh->commit;
1231 }
1232
1233 sub schedule_tb_lookup {
1234         return if (!defined($remoteglotconf::tb_serial_key));
1235         my $pos = $pos_waiting // $pos_calculating;
1236         return if (exists($tb_cache{$pos->fen()}));
1237
1238         # If there's more than seven pieces, there's not going to be an answer,
1239         # so don't bother.
1240         return if ($pos->num_pieces() > 7);
1241
1242         # Max one at a time. If it's still relevant when it returns,
1243         # schedule_tb_lookup() will be called again.
1244         return if ($tb_lookup_running);
1245
1246         $tb_lookup_running = 1;
1247         my $url = 'http://158.250.18.203:6904/tasks/addtask?auth.login=' .
1248                 $remoteglotconf::tb_serial_key .
1249                 '&auth.password=aquarium&type=0&fen=' .
1250                 URI::Escape::uri_escape($pos->fen());
1251         print TBLOG "Downloading $url...\n";
1252         AnyEvent::HTTP::http_get($url, sub {
1253                 handle_tb_lookup_return(@_, $pos, $pos->fen());
1254         });
1255 }
1256
1257 sub handle_tb_lookup_return {
1258         my ($body, $header, $pos, $fen) = @_;
1259         print TBLOG "Response for [$fen]:\n";
1260         print TBLOG $header . "\n\n";
1261         print TBLOG $body . "\n\n";
1262         eval {
1263                 my $response = JSON::XS::decode_json($body);
1264                 if ($response->{'ErrorCode'} != 0) {
1265                         die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
1266                 }
1267                 my $state = $response->{'Response'}{'StateString'};
1268                 if ($state eq 'COMPLETE') {
1269                         my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
1270                         if (!defined($pgn) || !$pgn->read_game()) {
1271                                 warn "Error in parsing PGN\n";
1272                         } else {
1273                                 $pgn->quick_parse_game;
1274                                 my $pvpos = $pos;
1275                                 my $moves = $pgn->moves;
1276                                 my @uci_moves = ();
1277                                 for my $move (@$moves) {
1278                                         my $uci_move;
1279                                         ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
1280                                         push @uci_moves, $uci_move;
1281                                 }
1282                                 $tb_cache{$fen} = {
1283                                         result => $pgn->result,
1284                                         pv => \@uci_moves,
1285                                         score => $response->{'Response'}{'Score'},
1286                                 };
1287                                 output();
1288                         }
1289                 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
1290                         # Try again in a second. Note that if we have changed
1291                         # position in the meantime, we might query a completely
1292                         # different position! But that's fine.
1293                 } else {
1294                         die "Unknown response state " . $state;
1295                 }
1296
1297                 # Wait a second before we schedule another one.
1298                 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
1299                         $tb_lookup_running = 0;
1300                         schedule_tb_lookup();
1301                 });
1302         };
1303         if ($@) {
1304                 warn "Error in tablebase lookup: $@";
1305
1306                 # Don't try this one again, but don't block new lookups either.
1307                 $tb_lookup_running = 0;
1308         }
1309 }
1310
1311 sub open_engine {
1312         my ($cmdline, $tag, $cb) = @_;
1313         return undef if (!defined($cmdline));
1314         return Engine->open($cmdline, $tag, $cb);
1315 }
1316
1317 sub col_letter_to_num {
1318         return ord(shift) - ord('a');
1319 }
1320
1321 sub row_letter_to_num {
1322         return 7 - (ord(shift) - ord('1'));
1323 }
1324
1325 sub parse_uci_move {
1326         my $move = shift;
1327         my $from_col = col_letter_to_num(substr($move, 0, 1));
1328         my $from_row = row_letter_to_num(substr($move, 1, 1));
1329         my $to_col   = col_letter_to_num(substr($move, 2, 1));
1330         my $to_row   = row_letter_to_num(substr($move, 3, 1));
1331         my $promo    = substr($move, 4, 1);
1332         return ($from_col, $from_row, $to_col, $to_row, $promo);
1333 }