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 <steinar+remoteglot@gunderson.no>
   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_lookup_running = 0;
  39 my $last_written_json = undef;
  40
  41 # Persisted so we can restart.
  42 # TODO: Figure out an appropriate way to deal with database restarts
  43 # and/or Postgres going away entirely.
  44 my $dbh = DBI->connect($remoteglotconf::dbistr, $remoteglotconf::dbiuser, $remoteglotconf::dbipass)
  45         or die DBI->errstr;
  46 $dbh->{RaiseError} = 1;
  47
  48 $| = 1;
  49
  50 open(FICSLOG, ">ficslog.txt")
  51         or die "ficslog.txt: $!";
  52 print FICSLOG "Log starting.\n";
  53 select(FICSLOG);
  54 $| = 1;
  55
  56 open(UCILOG, ">ucilog.txt")
  57         or die "ucilog.txt: $!";
  58 print UCILOG "Log starting.\n";
  59 select(UCILOG);
  60 $| = 1;
  61
  62 open(TBLOG, ">tblog.txt")
  63         or die "tblog.txt: $!";
  64 print TBLOG "Log starting.\n";
  65 select(TBLOG);
  66 $| = 1;
  67
  68 select(STDOUT);
  69 umask 0022;  # analysis.json should not be served to users.
  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_calculating, $pos_calculating_second_engine);
  77
  78 # If not undef, we've started calculating this position but haven't ever given out
  79 # any analysis for it, so we're on a forced timer to do so.
  80 my $pos_calculating_started = undef;
  81
  82 # If not undef, we've output this position, but without a main PV, so we're on
  83 # _another_ forced timer to do so.
  84 my $pos_pv_started = undef;
  85 my $last_output_had_pv = 0;
  86
  87 setoptions($engine, \%remoteglotconf::engine_config);
  88 uciprint($engine, "ucinewgame");
  89
  90 if (defined($engine2)) {
  91         setoptions($engine2, \%remoteglotconf::engine2_config);
  92         uciprint($engine2, "setoption name MultiPV value 500");
  93         uciprint($engine2, "ucinewgame");
  94 }
  95
  96 print "Chess engine ready.\n";
  97
  98 # now talk to FICS
  99 my ($t, $ev1);
 100 if (defined($remoteglotconf::server)) {
 101         $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
 102         $t->input_log(\*FICSLOG);
 103         $t->open($remoteglotconf::server);
 104         $t->print($remoteglotconf::nick);
 105         $t->waitfor('/Press return to enter the server/');
 106         $t->cmd("");
 107
 108         # set some options
 109         $t->cmd("set shout 0");
 110         $t->cmd("set seek 0");
 111         $t->cmd("set style 12");
 112
 113         $ev1 = AnyEvent->io(
 114                 fh => fileno($t),
 115                 poll => 'r',
 116                 cb => sub {    # what callback to execute
 117                         while (1) {
 118                                 my $line = $t->getline(Timeout => 0, errmode => 'return');
 119                                 return if (!defined($line));
 120
 121                                 chomp $line;
 122                                 $line =~ tr/\r//d;
 123                                 handle_fics($line);
 124                         }
 125                 }
 126         );
 127 }
 128 if (defined($remoteglotconf::target)) {
 129         if ($remoteglotconf::target =~ /^(?:\/|https?:)/) {
 130                 fetch_pgn($remoteglotconf::target);
 131         } elsif (defined($t)) {
 132                 $t->cmd("observe $remoteglotconf::target");
 133         }
 134 }
 135 if (defined($t)) {
 136         print "FICS ready.\n";
 137 }
 138
 139 # Engine events have already been set up by Engine.pm.
 140 EV::run;
 141
 142 sub handle_uci {
 143         my ($engine, $line, $primary) = @_;
 144
 145         return if $line =~ /(upper|lower)bound/;
 146
 147         $line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 148         print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
 149
 150         # If we've sent a stop command, gobble up lines until we see bestmove.
 151         return if ($engine->{'stopping'} && $line !~ /^bestmove/);
 152         $engine->{'stopping'} = 0;
 153
 154         if ($line =~ /^info/ && $line !~ / cluster /) {
 155                 my (@infos) = split / /, $line;
 156                 shift @infos;
 157
 158                 parse_infos($engine, @infos);
 159         }
 160         if ($line =~ /^id/) {
 161                 my (@ids) = split / /, $line;
 162                 shift @ids;
 163
 164                 parse_ids($engine, @ids);
 165         }
 166         output();
 167 }
 168
 169 my $getting_movelist = 0;
 170 my $pos_for_movelist = undef;
 171 my @uci_movelist = ();
 172 my @pretty_movelist = ();
 173
 174 sub handle_fics {
 175         my $line = shift;
 176         if ($line =~ /^<12> /) {
 177                 handle_position(Position->new($line));
 178                 $t->cmd("moves");
 179         }
 180         if ($line =~ /^Movelist for game /) {
 181                 my $pos = $pos_calculating;
 182                 if (defined($pos)) {
 183                         @uci_movelist = ();
 184                         @pretty_movelist = ();
 185                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 186                         $getting_movelist = 1;
 187                 }
 188         }
 189         if ($getting_movelist &&
 190             $line =~ /^\s* \d+\. \s+                     # move number
 191                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 192                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 193                      /x) {
 194                 eval {
 195                         my $uci_move;
 196                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 197                         push @uci_movelist, $uci_move;
 198                         push @pretty_movelist, $1;
 199
 200                         if (defined($2)) {
 201                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 202                                 push @uci_movelist, $uci_move;
 203                                 push @pretty_movelist, $2;
 204                         }
 205                 };
 206                 if ($@) {
 207                         warn "Error when getting FICS move history: $@";
 208                         $getting_movelist = 0;
 209                 }
 210         }
 211         if ($getting_movelist &&
 212             $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
 213                 # End of movelist.
 214                 if (defined($pos_calculating)) {
 215                         if ($pos_calculating->fen() eq $pos_for_movelist->fen()) {
 216                                 $pos_calculating->{'history'} = \@pretty_movelist;
 217                         }
 218                 }
 219                 $getting_movelist = 0;
 220         }
 221         if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 222                 my ($who, $msg) = ($1, $2);
 223
 224                 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
 225
 226                 if ($msg =~ /^fics (.*?)$/) {
 227                         $t->cmd("tell $who Executing '$1' on FICS.");
 228                         $t->cmd($1);
 229                 } elsif ($msg =~ /^uci (.*?)$/) {
 230                         $t->cmd("tell $who Sending '$1' to the engine.");
 231                         print { $engine->{'write'} } "$1\n";
 232                 } elsif ($msg =~ /^pgn (.*?)$/) {
 233                         my $url = $1;
 234                         $t->cmd("tell $who Starting to poll '$url'.");
 235                         fetch_pgn($url);
 236                 } elsif ($msg =~ /^stoppgn$/) {
 237                         $t->cmd("tell $who Stopping poll.");
 238                         $stop_pgn_fetch = 1;
 239                         $http_timer = undef;
 240                 } elsif ($msg =~ /^quit$/) {
 241                         $t->cmd("tell $who Bye bye.");
 242                         exit;
 243                 } else {
 244                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 245                 }
 246         }
 247         #print "FICS: [$line]\n";
 248 }
 249
 250 # Starts periodic fetching of PGNs from the given URL.
 251 sub fetch_pgn {
 252         my ($url) = @_;
 253         if ($url =~ m#^/#) {  # Local file.
 254                 eval {
 255                         local $/ = undef;
 256                         open my $fh, "<", $url
 257                                 or die "$url: $!";
 258                         my $pgn = <$fh>;
 259                         close $fh;
 260                         handle_pgn($pgn, '', $url);
 261                 };
 262                 if ($@) {
 263                         warn "$url: $@";
 264                         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 265                                 fetch_pgn($url);
 266                         });
 267                 }
 268         } else {
 269                 AnyEvent::HTTP::http_get($url, sub {
 270                         handle_pgn(@_, $url);
 271                 });
 272         }
 273 }
 274
 275 my ($last_pgn_white, $last_pgn_black);
 276 my @last_pgn_uci_moves = ();
 277 my $pgn_hysteresis_counter = 0;
 278
 279 sub handle_pgn {
 280         my ($body, $header, $url) = @_;
 281
 282         if ($stop_pgn_fetch) {
 283                 $stop_pgn_fetch = 0;
 284                 $http_timer = undef;
 285                 return;
 286         }
 287
 288         my $pgn = Chess::PGN::Parse->new(undef, $body);
 289         if (!defined($pgn)) {
 290                 warn "Error in parsing PGN from $url [body='$body']\n";
 291         } elsif (!$pgn->read_game()) {
 292                 warn "Error in reading PGN game from $url [body='$body']\n";
 293         } elsif ($body !~ /^\[/) {
 294                 warn "Malformed PGN from $url [body='$body']\n";
 295         } else {
 296                 eval {
 297                         # Skip to the right game.
 298                         while (defined($remoteglotconf::pgn_filter) &&
 299                                !&$remoteglotconf::pgn_filter($pgn)) {
 300                                 $pgn->read_game() or die "Out of games during filtering";
 301                         }
 302
 303                         $pgn->parse_game({ save_comments => 'yes' });
 304                         my $white = $pgn->white;
 305                         my $black = $pgn->black;
 306                         $white =~ s/,.*//;  # Remove first name.
 307                         $black =~ s/,.*//;  # Remove first name.
 308                         my $tags = $pgn->tags();
 309                         my $pos;
 310                         if (exists($tags->{'FEN'})) {
 311                                 $pos = Position->from_fen($tags->{'FEN'});
 312                                 $pos->{'last_move'} = 'none';
 313                                 $pos->{'player_w'} = $white;
 314                                 $pos->{'player_b'} = $black;
 315                                 $pos->{'start_fen'} = $tags->{'FEN'};
 316                         } else {
 317                                 $pos = Position->start_pos($white, $black);
 318                         }
 319                         if (exists($tags->{'Variant'}) &&
 320                             $tags->{'Variant'} =~ /960|fischer/i) {
 321                                 $pos->{'chess960'} = 1;
 322                         } else {
 323                                 $pos->{'chess960'} = 0;
 324                         }
 325                         my $moves = $pgn->moves;
 326                         my @uci_moves = ();
 327                         my @repretty_moves = ();
 328                         for my $move (@$moves) {
 329                                 my ($npos, $uci_move) = $pos->make_pretty_move($move);
 330                                 push @uci_moves, $uci_move;
 331
 332                                 # Re-prettyprint the move.
 333                                 my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($uci_move);
 334                                 my ($pretty, undef) = $pos->{'board'}->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 335                                 push @repretty_moves, $pretty;
 336                                 $pos = $npos;
 337                         }
 338                         if ($pgn->result eq '1-0' || $pgn->result eq '1/2-1/2' || $pgn->result eq '0-1') {
 339                                 $pos->{'result'} = $pgn->result;
 340                         }
 341                         $pos->{'history'} = \@repretty_moves;
 342
 343                         extract_clock($pgn, $pos);
 344
 345                         # Sometimes, PGNs lose a move or two for a short while,
 346                         # or people push out new ones non-atomically.
 347                         # Thus, if we PGN doesn't change names but becomes
 348                         # shorter, we mistrust it for a few seconds.
 349                         my $trust_pgn = 1;
 350                         if (defined($last_pgn_white) && defined($last_pgn_black) &&
 351                             $last_pgn_white eq $pgn->white &&
 352                             $last_pgn_black eq $pgn->black &&
 353                             scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 354                                 if (++$pgn_hysteresis_counter < 3) {
 355                                         $trust_pgn = 0;
 356                                 }
 357                         }
 358                         if ($trust_pgn) {
 359                                 $last_pgn_white = $pgn->white;
 360                                 $last_pgn_black = $pgn->black;
 361                                 @last_pgn_uci_moves = @uci_moves;
 362                                 $pgn_hysteresis_counter = 0;
 363                                 handle_position($pos);
 364                         }
 365                 };
 366                 if ($@) {
 367                         warn "Error in parsing moves from $url: $@\n";
 368                 }
 369         }
 370
 371         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 372                 fetch_pgn($url);
 373         });
 374 }
 375
 376 sub handle_position {
 377         my ($pos) = @_;
 378         find_clock_start($pos, $pos_calculating);
 379
 380         # If we're already chewing on this and there's nothing else in the queue,
 381         # ignore it.
 382         if (defined($pos_calculating) && $pos->fen() eq $pos_calculating->fen()) {
 383                 $pos_calculating->{'result'} = $pos->{'result'};
 384                 for my $key ('white_clock', 'black_clock', 'white_clock_target', 'black_clock_target') {
 385                         $pos_calculating->{$key} //= $pos->{$key};
 386                 }
 387                 return;
 388         }
 389
 390         # If we're already thinking on something, stop and wait for the engine
 391         # to approve.
 392         if (defined($pos_calculating)) {
 393                 # Store the final data we have for this position in the history,
 394                 # with the precise clock information we just got from the new
 395                 # position. (Historic positions store the clock at the end of
 396                 # the position.)
 397                 #
 398                 # Do not output anything new to the main analysis; that's
 399                 # going to be obsolete really soon. (Exception: If we've never
 400                 # output anything for this move, ie., it didn't hit the 200ms
 401                 # limit, spit it out to the user anyway. It's probably a really
 402                 # fast blitz game or something, and it's good to show the moves
 403                 # as they come in even without great analysis.)
 404                 $pos_calculating->{'white_clock'} = $pos->{'white_clock'};
 405                 $pos_calculating->{'black_clock'} = $pos->{'black_clock'};
 406                 delete $pos_calculating->{'white_clock_target'};
 407                 delete $pos_calculating->{'black_clock_target'};
 408
 409                 if (defined($pos_calculating_started)) {
 410                         output_json(0);
 411                 } else {
 412                         output_json(1);
 413                 }
 414                 $pos_calculating_started = [Time::HiRes::gettimeofday];
 415                 $pos_pv_started = undef;
 416
 417                 # Ask the engine to stop; we will throw away its data until it
 418                 # sends us "bestmove", signaling the end of it.
 419                 $engine->{'stopping'} = 1;
 420                 uciprint($engine, "stop");
 421         }
 422
 423         # It's wrong to just give the FEN (the move history is useful,
 424         # and per the UCI spec, we should really have sent "ucinewgame"),
 425         # but it's easier, and it works around a Stockfish repetition issue.
 426         if ($engine->{'chess960'} != $pos->{'chess960'}) {
 427                 uciprint($engine, "setoption name UCI_Chess960 value " . ($pos->{'chess960'} ? 'true' : 'false'));
 428                 $engine->{'chess960'} = $pos->{'chess960'};
 429         }
 430         uciprint($engine, "position fen " . $pos->fen());
 431         uciprint($engine, "go infinite");
 432         $pos_calculating = $pos;
 433         $pos_calculating_started = [Time::HiRes::gettimeofday];
 434         $pos_pv_started = undef;
 435
 436         if (defined($engine2)) {
 437                 if (defined($pos_calculating_second_engine)) {
 438                         $engine2->{'stopping'} = 1;
 439                         uciprint($engine2, "stop");
 440                 }
 441                 if ($engine2->{'chess960'} != $pos->{'chess960'}) {
 442                         uciprint($engine2, "setoption name UCI_Chess960 value " . ($pos->{'chess960'} ? 'true' : 'false'));
 443                         $engine2->{'chess960'} = $pos->{'chess960'};
 444                 }
 445                 uciprint($engine2, "position fen " . $pos->fen());
 446                 uciprint($engine2, "go infinite");
 447                 $pos_calculating_second_engine = $pos;
 448                 $engine2->{'info'} = {};
 449         }
 450
 451         $engine->{'info'} = {};
 452         $last_move = time;
 453
 454         #
 455         # Output a command every move to note that we're
 456         # still paying attention -- this is a good tradeoff,
 457         # since if no move has happened in the last half
 458         # hour, the analysis/relay has most likely stopped
 459         # and we should stop hogging server resources.
 460         #
 461         if (defined($t)) {
 462                 $t->cmd("date");
 463         }
 464 }
 465
 466 sub parse_infos {
 467         my ($engine, @x) = @_;
 468         my $mpv = '';
 469
 470         my $info = $engine->{'info'};
 471
 472         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 473         for my $i (0..$#x - 1) {
 474                 if ($x[$i] eq 'multipv') {
 475                         $mpv = $x[$i + 1];
 476                         next;
 477                 }
 478         }
 479
 480         while (scalar @x > 0) {
 481                 if ($x[0] eq 'multipv') {
 482                         # Dealt with above
 483                         shift @x;
 484                         shift @x;
 485                         next;
 486                 }
 487                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 488                         my $key = shift @x;
 489                         my $value = shift @x;
 490                         $info->{$key} = $value;
 491                         next;
 492                 }
 493                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 494                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 495                     $x[0] eq 'tbhits') {
 496                         my $key = shift @x;
 497                         my $value = shift @x;
 498                         $info->{$key . $mpv} = $value;
 499                         next;
 500                 }
 501                 if ($x[0] eq 'score') {
 502                         shift @x;
 503
 504                         delete $info->{'score_cp' . $mpv};
 505                         delete $info->{'score_mate' . $mpv};
 506                         delete $info->{'splicepos' . $mpv};
 507
 508                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 509                                 if ($x[0] eq 'cp') {
 510                                         shift @x;
 511                                         $info->{'score_cp' . $mpv} = shift @x;
 512                                 } elsif ($x[0] eq 'mate') {
 513                                         shift @x;
 514                                         $info->{'score_mate' . $mpv} = shift @x;
 515                                 } else {
 516                                         shift @x;
 517                                 }
 518                         }
 519                         next;
 520                 }
 521                 if ($x[0] eq 'pv') {
 522                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 523                         last;
 524                 }
 525                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 526                         last;
 527                 }
 528
 529                 #print "unknown info '$x[0]', trying to recover...\n";
 530                 #shift @x;
 531                 die "Unknown info '" . join(',', @x) . "'";
 532
 533         }
 534 }
 535
 536 sub parse_ids {
 537         my ($engine, @x) = @_;
 538
 539         while (scalar @x > 0) {
 540                 if ($x[0] eq 'name') {
 541                         my $value = join(' ', @x);
 542                         $engine->{'id'}{'author'} = $value;
 543                         last;
 544                 }
 545
 546                 # unknown
 547                 shift @x;
 548         }
 549 }
 550
 551 sub prettyprint_pv_no_cache {
 552         my ($board, @pvs) = @_;
 553
 554         if (scalar @pvs == 0 || !defined($pvs[0])) {
 555                 return ();
 556         }
 557
 558         my @ret = ();
 559         for my $pv (@pvs) {
 560                 my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($pv);
 561                 my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 562                 push @ret, $pretty;
 563                 $board = $nb;
 564         }
 565         return @ret;
 566 }
 567
 568 sub prettyprint_pv {
 569         my ($pos, @pvs) = @_;
 570
 571         my $cachekey = join('', @pvs);
 572         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 573                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 574         } else {
 575                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 576                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 577                 return @res;
 578         }
 579 }
 580
 581 my %tbprobe_cache = ();
 582
 583 sub complete_using_tbprobe {
 584         my ($pos, $info, $mpv) = @_;
 585
 586         # We need Fathom installed to do standalone TB probes.
 587         return if (!defined($remoteglotconf::fathom_cmdline));
 588
 589         # If we already have a mate, don't bother; in some cases, it would even be
 590         # better than a tablebase score.
 591         return if defined($info->{'score_mate' . $mpv});
 592
 593         # If we have a draw or near-draw score, there's also not much interesting
 594         # we could add from a tablebase. We only really want mates.
 595         return if ($info->{'score_cp' . $mpv} >= -12250 && $info->{'score_cp' . $mpv} <= 12250);
 596
 597         # Run through the PV until we are at a 6-man position.
 598         # TODO: We could in theory only have 5-man data.
 599         my @pv = @{$info->{'pv' . $mpv}};
 600         my $key = $pos->fen() . " " . join('', @pv);
 601         my @moves = ();
 602         my $splicepos;
 603         if (exists($tbprobe_cache{$key})) {
 604                 my $c = $tbprobe_cache{$key};
 605                 @moves = @{$c->{'moves'}};
 606                 $splicepos = $c->{'splicepos'};
 607         } else {
 608                 if ($mpv ne '') {
 609                         # Force doing at least one move of the PV.
 610                         my $move = shift @pv;
 611                         push @moves, $move;
 612                         $pos = $pos->make_move(parse_uci_move($move));
 613                 }
 614
 615                 while ($pos->num_pieces() > 7 && $#pv > -1) {
 616                         my $move = shift @pv;
 617                         push @moves, $move;
 618                         $pos = $pos->make_move(parse_uci_move($move));
 619                 }
 620
 621                 return if ($pos->num_pieces() > 7);
 622
 623                 my $fen = $pos->fen();
 624                 my $pgn_text = `$remoteglotconf::fathom_cmdline "$fen"`;
 625                 my $pgn = Chess::PGN::Parse->new(undef, $pgn_text);
 626                 return if (!defined($pgn) || !$pgn->read_game() || ($pgn->result ne '0-1' && $pgn->result ne '1-0'));
 627                 $pgn->quick_parse_game;
 628
 629                 # Splice the PV from the tablebase onto what we have so far.
 630                 $splicepos = scalar @moves;
 631                 for my $move (@{$pgn->moves}) {
 632                         last if $move eq '#';
 633                         last if $move eq '1-0';
 634                         last if $move eq '0-1';
 635                         last if $move eq '1/2-1/2';
 636                         my $uci_move;
 637                         ($pos, $uci_move) = $pos->make_pretty_move($move);
 638                         push @moves, $uci_move;
 639                 }
 640
 641                 $tbprobe_cache{$key} = {
 642                         moves => \@moves,
 643                         splicepos => $splicepos
 644                 };
 645         }
 646
 647         $info->{'pv' . $mpv} = \@moves;
 648
 649         my $matelen = int((1 + scalar @moves) / 2);
 650         if ((scalar @moves) % 2 == 0) {
 651                 $info->{'score_mate' . $mpv} = -$matelen;
 652         } else {
 653                 $info->{'score_mate' . $mpv} = $matelen;
 654         }
 655         $info->{'splicepos' . $mpv} = $splicepos;
 656 }
 657
 658 sub output {
 659         #return;
 660
 661         return if (!defined($pos_calculating));
 662
 663         my $info = $engine->{'info'};
 664
 665         # Don't update too often.
 666         my $wait = $remoteglotconf::update_max_interval - Time::HiRes::tv_interval($latest_update);
 667         if (defined($pos_calculating_started)) {
 668                 my $new_pos_wait = $remoteglotconf::update_force_after_move - Time::HiRes::tv_interval($pos_calculating_started);
 669                 $wait = $new_pos_wait if ($new_pos_wait < $wait);
 670         }
 671         if (!$last_output_had_pv && has_pv($info)) {
 672                 if (!defined($pos_pv_started)) {
 673                         $pos_pv_started = [Time::HiRes::gettimeofday];
 674                 }
 675                 # We just got initial PV, and we're in a hurry since we gave out a blank one earlier,
 676                 # so give us just 200ms more to increase the quality and then force a display.
 677                 my $new_pos_wait = $remoteglotconf::update_force_after_move - Time::HiRes::tv_interval($pos_pv_started);
 678                 $wait = $new_pos_wait if ($new_pos_wait < $wait);
 679         }
 680         if ($wait > 0.0) {
 681                 $output_timer = AnyEvent->timer(after => $wait + 0.01, cb => \&output);
 682                 return;
 683         }
 684         $pos_pv_started = undef;
 685
 686         # We're outputting something for this position now, so the special handling
 687         # for new positions is off.
 688         undef $pos_calculating_started;
 689
 690         #
 691         # Some programs _always_ report MultiPV, even with only one PV.
 692         # In this case, we simply use that data as if MultiPV was never
 693         # specified.
 694         #
 695         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 696                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits splicepos)) {
 697                         if (exists($info->{$key . '1'})) {
 698                                 $info->{$key} = $info->{$key . '1'};
 699                         } else {
 700                                 delete $info->{$key};
 701                         }
 702                 }
 703         }
 704
 705         #
 706         # Check the PVs first. if they're invalid, just wait, as our data
 707         # is most likely out of sync. This isn't a very good solution, as
 708         # it can frequently miss stuff, but it's good enough for most users.
 709         #
 710         eval {
 711                 my $dummy;
 712                 if (exists($info->{'pv'})) {
 713                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 714                 }
 715
 716                 my $mpv = 1;
 717                 while (exists($info->{'pv' . $mpv})) {
 718                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 719                         ++$mpv;
 720                 }
 721         };
 722         if ($@) {
 723                 $engine->{'info'} = {};
 724                 return;
 725         }
 726
 727         # Now do our own Syzygy tablebase probes to convert scores like +123.45 to mate.
 728         if (exists($info->{'pv'})) {
 729                 complete_using_tbprobe($pos_calculating, $info, '');
 730         }
 731
 732         my $mpv = 1;
 733         while (exists($info->{'pv' . $mpv})) {
 734                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 735                 ++$mpv;
 736         }
 737
 738         output_screen();
 739         output_json(0);
 740         $latest_update = [Time::HiRes::gettimeofday];
 741         $last_output_had_pv = has_pv($info);
 742 }
 743
 744 sub has_pv {
 745         my $info = shift;
 746         return 1 if (exists($info->{'pv'}) && (scalar(@{$info->{'pv'}}) > 0));
 747         return 1 if (exists($info->{'pv1'}) && (scalar(@{$info->{'pv1'}}) > 0));
 748         return 0;
 749 }
 750
 751 sub output_screen {
 752         my $info = $engine->{'info'};
 753         my $id = $engine->{'id'};
 754
 755         my $text = 'Analysis';
 756         if ($pos_calculating->{'last_move'} ne 'none') {
 757                 if ($pos_calculating->{'toplay'} eq 'W') {
 758                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 759                 } else {
 760                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 761                 }
 762                 if (exists($id->{'name'})) {
 763                         $text .= ',';
 764                 }
 765         }
 766
 767         if (exists($id->{'name'})) {
 768                 $text .= " by $id->{'name'}:\n\n";
 769         } else {
 770                 $text .= ":\n\n";
 771         }
 772
 773         return unless (exists($pos_calculating->{'board'}));
 774
 775         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 776                 # multi-PV
 777                 my $mpv = 1;
 778                 while (exists($info->{'pv' . $mpv})) {
 779                         $text .= sprintf "  PV%2u", $mpv;
 780                         my $score = short_score($info, $pos_calculating, $mpv);
 781                         $text .= "  ($score)" if (defined($score));
 782
 783                         my $tbhits = '';
 784                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 785                                 if ($info->{'tbhits' . $mpv} == 1) {
 786                                         $tbhits = ", 1 tbhit";
 787                                 } else {
 788                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 789                                 }
 790                         }
 791
 792                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 793                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 794                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 795                         }
 796
 797                         $text .= ":\n";
 798                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 799                         $text .= "\n";
 800                         ++$mpv;
 801                 }
 802         } else {
 803                 # single-PV
 804                 my $score = long_score($info, $pos_calculating, '');
 805                 $text .= "  $score\n" if defined($score);
 806                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 807                 $text .=  "\n";
 808
 809                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 810                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 811                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 812                 }
 813                 if (exists($info->{'seldepth'})) {
 814                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 815                 }
 816                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 817                         if ($info->{'tbhits'} == 1) {
 818                                 $text .= ", one Syzygy hit";
 819                         } else {
 820                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 821                         }
 822                 }
 823                 $text .= "\n\n";
 824         }
 825
 826         my @refutation_lines = ();
 827         if (defined($engine2)) {
 828                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 829                         my $info = $engine2->{'info'};
 830                         last if (!exists($info->{'pv' . $mpv}));
 831                         eval {
 832                                 complete_using_tbprobe($pos_calculating_second_engine, $info, $mpv);
 833                                 my $pv = $info->{'pv' . $mpv};
 834                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 835                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 836                                 if (scalar @pretty_pv > 5) {
 837                                         @pretty_pv = @pretty_pv[0..4];
 838                                         push @pretty_pv, "...";
 839                                 }
 840                                 my $key = $pretty_move;
 841                                 my $line = sprintf("  %-6s %6s %3s  %s",
 842                                         $pretty_move,
 843                                         short_score($info, $pos_calculating_second_engine, $mpv),
 844                                         "d" . $info->{'depth' . $mpv},
 845                                         join(', ', @pretty_pv));
 846                                 push @refutation_lines, [ $key, $line ];
 847                         };
 848                 }
 849         }
 850
 851         if ($#refutation_lines >= 0) {
 852                 $text .= "Shallow search of all legal moves:\n\n";
 853                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 854                         $text .= $line->[1] . "\n";
 855                 }
 856                 $text .= "\n\n";
 857         }
 858
 859         if ($last_text ne $text) {
 860                 print "\e[H\e[2J"; # clear the screen
 861                 print $text;
 862                 $last_text = $text;
 863         }
 864 }
 865
 866 sub output_json {
 867         my $historic_json_only = shift;
 868         my $info = $engine->{'info'};
 869
 870         my $json = {};
 871         $json->{'position'} = $pos_calculating->to_json_hash();
 872         $json->{'engine'} = $engine->{'id'};
 873         if (defined($remoteglotconf::engine_url)) {
 874                 $json->{'engine'}{'url'} = $remoteglotconf::engine_url;
 875         }
 876         if (defined($remoteglotconf::engine_details)) {
 877                 $json->{'engine'}{'details'} = $remoteglotconf::engine_details;
 878         }
 879         my @grpc_backends = ();
 880         if (defined($remoteglotconf::engine_grpc_backend)) {
 881                 push @grpc_backends, $remoteglotconf::engine_grpc_backend;
 882         }
 883         if (defined($remoteglotconf::engine2_grpc_backend)) {
 884                 push @grpc_backends, $remoteglotconf::engine2_grpc_backend;
 885         }
 886         $json->{'internal'}{'grpc_backends'} = \@grpc_backends;
 887         if (defined($remoteglotconf::move_source)) {
 888                 $json->{'move_source'} = $remoteglotconf::move_source;
 889         }
 890         if (defined($remoteglotconf::move_source_url)) {
 891                 $json->{'move_source_url'} = $remoteglotconf::move_source_url;
 892         }
 893         $json->{'score'} = score_digest($info, $pos_calculating, '');
 894
 895         $json->{'nodes'} = $info->{'nodes'};
 896         $json->{'nps'} = $info->{'nps'};
 897         $json->{'depth'} = $info->{'depth'};
 898         $json->{'tbhits'} = $info->{'tbhits'};
 899         $json->{'seldepth'} = $info->{'seldepth'};
 900         $json->{'tablebase'} = $info->{'tablebase'};
 901         $json->{'pv'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 902
 903         my %refutation_lines = ();
 904         my @refutation_lines = ();
 905         if (defined($engine2)) {
 906                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 907                         my $info = $engine2->{'info'};
 908                         my $pretty_move = "";
 909                         my @pretty_pv = ();
 910                         last if (!exists($info->{'pv' . $mpv}));
 911
 912                         eval {
 913                                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 914                                 my $pv = $info->{'pv' . $mpv};
 915                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 916                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 917                                 $refutation_lines{$pretty_move} = {
 918                                         depth => $info->{'depth' . $mpv},
 919                                         score => score_digest($info, $pos_calculating, $mpv),
 920                                         move => $pretty_move,
 921                                         pv => \@pretty_pv,
 922                                 };
 923                                 if (exists($info->{'splicepos' . $mpv})) {
 924                                         $refutation_lines{$pretty_move}->{'splicepos'} = $info->{'splicepos' . $mpv};
 925                                 }
 926                         };
 927                 }
 928         }
 929         $json->{'refutation_lines'} = \%refutation_lines;
 930
 931         # Piece together historic score information, to the degree we have it.
 932         if (!$historic_json_only && exists($pos_calculating->{'history'})) {
 933                 my %score_history = ();
 934
 935                 local $dbh->{AutoCommit} = 0;
 936                 my $q = $dbh->prepare('SELECT * FROM scores WHERE id=?');
 937                 my $pos;
 938                 if (exists($pos_calculating->{'start_fen'})) {
 939                         $pos = Position->from_fen($pos_calculating->{'start_fen'});
 940                 } else {
 941                         $pos = Position->start_pos('white', 'black');
 942                 }
 943                 $pos->{'chess960'} = $pos_calculating->{'chess960'};
 944                 my $halfmove_num = 0;
 945                 for my $move (@{$pos_calculating->{'history'}}) {
 946                         my $id = id_for_pos($pos, $halfmove_num);
 947                         my $ref = $dbh->selectrow_hashref($q, undef, $id);
 948                         if (defined($ref)) {
 949                                 $score_history{$halfmove_num} = [
 950                                         $ref->{'score_type'},
 951                                         $ref->{'score_value'}
 952                                 ];
 953                         }
 954                         ++$halfmove_num;
 955                         ($pos) = $pos->make_pretty_move($move);
 956                 }
 957                 $q->finish;
 958                 $dbh->commit;
 959
 960                 # If at any point we are missing 10 consecutive moves,
 961                 # truncate the history there. This is so we don't get into
 962                 # a situation where we e.g. start analyzing at move 45,
 963                 # but we have analysis for 1. e4 from some completely different game
 964                 # and thus show a huge hole.
 965                 my $consecutive_missing = 0;
 966                 my $truncate_until = 0;
 967                 for (my $i = $halfmove_num; $i --> 0; ) {
 968                         if ($consecutive_missing >= 10) {
 969                                 delete $score_history{$i};
 970                                 next;
 971                         }
 972                         if (exists($score_history{$i})) {
 973                                 $consecutive_missing = 0;
 974                         } else {
 975                                 ++$consecutive_missing;
 976                         }
 977                 }
 978
 979                 $json->{'score_history'} = \%score_history;
 980         }
 981
 982         # Give out a list of other games going on. (Empty is fine.)
 983         # TODO: Don't bother reading our own file, the data will be stale anyway.
 984         if (!$historic_json_only) {
 985                 my @games = ();
 986
 987                 my $q = $dbh->prepare('SELECT * FROM current_games ORDER BY priority DESC, id');
 988                 $q->execute;
 989                 while (my $ref = $q->fetchrow_hashref) {
 990                         eval {
 991                                 my $other_game_contents = File::Slurp::read_file($ref->{'json_path'});
 992                                 my $other_game_json = JSON::XS::decode_json($other_game_contents);
 993
 994                                 die "Missing position" if (!exists($other_game_json->{'position'}));
 995                                 my $white = $other_game_json->{'position'}{'player_w'} // die 'Missing white';
 996                                 my $black = $other_game_json->{'position'}{'player_b'} // die 'Missing black';
 997
 998                                 my $game = {
 999                                         id => $ref->{'id'},
1000                                         name => "$white–$black",
1001                                         url => $ref->{'url'},
1002                                         hashurl => $ref->{'hash_url'},
1003                                 };
1004                                 if (defined($other_game_json->{'position'}{'result'})) {
1005                                         $game->{'result'} = $other_game_json->{'position'}{'result'};
1006                                 } else {
1007                                         $game->{'score'} = $other_game_json->{'score'};
1008                                 }
1009                                 push @games, $game;
1010                         };
1011                         if ($@) {
1012                                 warn "Could not add external game " . $ref->{'json_path'} . ": $@";
1013                         }
1014                 }
1015
1016                 if (scalar @games > 0) {
1017                         $json->{'games'} = \@games;
1018                 }
1019         }
1020
1021         my $json_enc = JSON::XS->new;
1022         $json_enc->canonical(1);
1023         my $encoded = $json_enc->encode($json);
1024         unless ($historic_json_only || !defined($remoteglotconf::json_output) ||
1025                 (defined($last_written_json) && $last_written_json eq $encoded)) {
1026                 atomic_set_contents($remoteglotconf::json_output, $encoded);
1027                 $last_written_json = $encoded;
1028         }
1029
1030         if (exists($pos_calculating->{'history'}) &&
1031             defined($remoteglotconf::json_history_dir) && defined($json->{'engine'}{name})) {
1032                 my $id = id_for_pos($pos_calculating);
1033                 my $filename = $remoteglotconf::json_history_dir . "/" . $id . ".json";
1034
1035                 # Overwrite old analysis (assuming it exists at all) if we're
1036                 # using a different engine, or if we've calculated deeper.
1037                 # nodes is used as a tiebreaker. Don't bother about Multi-PV
1038                 # data; it's not that important.
1039                 my ($old_engine, $old_depth, $old_nodes) = get_json_analysis_stats($id);
1040                 my $new_depth = $json->{'depth'} // 0;
1041                 my $new_nodes = $json->{'nodes'} // 0;
1042                 if (!defined($old_engine) ||
1043                     $old_engine ne $json->{'engine'}{'name'} ||
1044                     $new_depth > $old_depth ||
1045                     ($new_depth == $old_depth && $new_nodes >= $old_nodes)) {
1046                         atomic_set_contents($filename, $encoded);
1047                         if (defined($json->{'score'})) {
1048                                 $dbh->do('INSERT INTO scores (id, score_type, score_value, engine, depth, nodes) VALUES (?,?,?,?,?,?) ' .
1049                                          '    ON CONFLICT (id) DO UPDATE SET ' .
1050                                          '        score_type=EXCLUDED.score_type, ' .
1051                                          '        score_value=EXCLUDED.score_value, ' .
1052                                          '        engine=EXCLUDED.engine, ' .
1053                                          '        depth=EXCLUDED.depth, ' .
1054                                          '        nodes=EXCLUDED.nodes',
1055                                         undef,
1056                                         $id, $json->{'score'}[0], $json->{'score'}[1],
1057                                         $json->{'engine'}{'name'}, $new_depth, $new_nodes);
1058                         }
1059                 }
1060         }
1061 }
1062
1063 sub atomic_set_contents {
1064         my ($filename, $contents) = @_;
1065
1066         open my $fh, ">", $filename . ".tmp"
1067                 or return;
1068         print $fh $contents;
1069         close $fh;
1070         rename($filename . ".tmp", $filename);
1071 }
1072
1073 sub id_for_pos {
1074         my ($pos, $halfmove_num) = @_;
1075
1076         $halfmove_num //= scalar @{$pos->{'history'}};
1077         (my $fen = $pos->fen()) =~ tr,/ ,-_,;
1078         return "move$halfmove_num-$fen";
1079 }
1080
1081 sub get_json_analysis_stats {
1082         my $id = shift;
1083         my $ref = $dbh->selectrow_hashref('SELECT * FROM scores WHERE id=?', undef, $id);
1084         if (defined($ref)) {
1085                 return ($ref->{'engine'}, $ref->{'depth'}, $ref->{'nodes'});
1086         } else {
1087                 return ('', 0, 0);
1088         }
1089 }
1090
1091 sub uciprint {
1092         my ($engine, $msg) = @_;
1093         $engine->print($msg);
1094         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
1095 }
1096
1097 sub short_score {
1098         my ($info, $pos, $mpv) = @_;
1099
1100         my $invert = ($pos->{'toplay'} eq 'B');
1101         if (defined($info->{'score_mate' . $mpv})) {
1102                 if ($invert) {
1103                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
1104                 } else {
1105                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
1106                 }
1107         } else {
1108                 if (exists($info->{'score_cp' . $mpv})) {
1109                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1110                         if ($score == 0) {
1111                                 if ($info->{'tablebase'}) {
1112                                         return "TB draw";
1113                                 } else {
1114                                         return " 0.00";
1115                                 }
1116                         }
1117                         if ($invert) {
1118                                 $score = -$score;
1119                         }
1120                         return sprintf "%+5.2f", $score;
1121                 }
1122         }
1123
1124         return undef;
1125 }
1126
1127 # Sufficient for computing long_score, short_score, plot_score and
1128 # (with side-to-play information) score_sort_key.
1129 sub score_digest {
1130         my ($info, $pos, $mpv) = @_;
1131
1132         if (defined($info->{'score_mate' . $mpv})) {
1133                 my $mate = $info->{'score_mate' . $mpv};
1134                 if ($pos->{'toplay'} eq 'B') {
1135                         $mate = -$mate;
1136                 }
1137                 if (exists($info->{'splicepos' . $mpv})) {
1138                         my $sp = $info->{'splicepos' . $mpv};
1139                         if ($mate > 0) {
1140                                 return ['T', $sp];
1141                         } else {
1142                                 return ['t', $sp];
1143                         }
1144                 } else {
1145                         if ($mate > 0) {
1146                                 return ['M', $mate];
1147                         } elsif ($mate < 0) {
1148                                 return ['m', -$mate];
1149                         } elsif ($pos->{'toplay'} eq 'B') {
1150                                 return ['M', 0];
1151                         } else {
1152                                 return ['m', 0];
1153                         }
1154                 }
1155         } else {
1156                 if (exists($info->{'score_cp' . $mpv})) {
1157                         my $score = $info->{'score_cp' . $mpv};
1158                         if ($pos->{'toplay'} eq 'B') {
1159                                 $score = -$score;
1160                         }
1161                         if ($score == 0 && $info->{'tablebase'}) {
1162                                 return ['d', undef];
1163                         } else {
1164                                 return ['cp', int($score)];
1165                         }
1166                 }
1167         }
1168
1169         return undef;
1170 }
1171
1172 sub long_score {
1173         my ($info, $pos, $mpv) = @_;
1174
1175         if (defined($info->{'score_mate' . $mpv})) {
1176                 my $mate = $info->{'score_mate' . $mpv};
1177                 if ($pos->{'toplay'} eq 'B') {
1178                         $mate = -$mate;
1179                 }
1180                 if (exists($info->{'splicepos' . $mpv})) {
1181                         my $sp = $info->{'splicepos' . $mpv};
1182                         if ($mate > 0) {
1183                                 return sprintf "White wins in %u", int(($sp + 1) * 0.5);
1184                         } else {
1185                                 return sprintf "Black wins in %u", int(($sp + 1) * 0.5);
1186                         }
1187                 } else {
1188                         if ($mate > 0) {
1189                                 return sprintf "White mates in %u", $mate;
1190                         } else {
1191                                 return sprintf "Black mates in %u", -$mate;
1192                         }
1193                 }
1194         } else {
1195                 if (exists($info->{'score_cp' . $mpv})) {
1196                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1197                         if ($score == 0) {
1198                                 if ($info->{'tablebase'}) {
1199                                         return "Theoretical draw";
1200                                 } else {
1201                                         return "Score:  0.00";
1202                                 }
1203                         }
1204                         if ($pos->{'toplay'} eq 'B') {
1205                                 $score = -$score;
1206                         }
1207                         return sprintf "Score: %+5.2f", $score;
1208                 }
1209         }
1210
1211         return undef;
1212 }
1213
1214 # For graphs; a single number in centipawns, capped at +/- 500.
1215 sub plot_score {
1216         my ($info, $pos, $mpv) = @_;
1217
1218         my $invert = ($pos->{'toplay'} eq 'B');
1219         if (defined($info->{'score_mate' . $mpv})) {
1220                 my $mate = $info->{'score_mate' . $mpv};
1221                 if ($invert) {
1222                         $mate = -$mate;
1223                 }
1224                 if ($mate > 0) {
1225                         return 500;
1226                 } else {
1227                         return -500;
1228                 }
1229         } else {
1230                 if (exists($info->{'score_cp' . $mpv})) {
1231                         my $score = $info->{'score_cp' . $mpv};
1232                         if ($invert) {
1233                                 $score = -$score;
1234                         }
1235                         $score = 500 if ($score > 500);
1236                         $score = -500 if ($score < -500);
1237                         return int($score);
1238                 }
1239         }
1240
1241         return undef;
1242 }
1243
1244 sub extract_clock {
1245         my ($pgn, $pos) = @_;
1246
1247         # Look for extended PGN clock tags.
1248         my $tags = $pgn->tags;
1249         if (exists($tags->{'WhiteClock'}) && exists($tags->{'BlackClock'})) {
1250                 $pos->{'white_clock'} = hms_to_sec($tags->{'WhiteClock'});
1251                 $pos->{'black_clock'} = hms_to_sec($tags->{'BlackClock'});
1252                 return;
1253         }
1254
1255         # Look for TCEC-style time comments.
1256         my $moves = $pgn->moves;
1257         my $comments = $pgn->comments;
1258         my $last_black_move = int((scalar @$moves) / 2);
1259         my $last_white_move = int((1 + scalar @$moves) / 2);
1260
1261         my $black_key = $last_black_move . "b";
1262         my $white_key = $last_white_move . "w";
1263
1264         if (exists($comments->{$white_key}) &&
1265             exists($comments->{$black_key}) &&
1266             $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/ &&
1267             $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/) {
1268                 $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1269                 $pos->{'white_clock'} = hms_to_sec($1);
1270                 $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1271                 $pos->{'black_clock'} = hms_to_sec($1);
1272                 return;
1273         }
1274
1275         delete $pos->{'white_clock'};
1276         delete $pos->{'black_clock'};
1277 }
1278
1279 sub hms_to_sec {
1280         my $hms = shift;
1281         return undef if (!defined($hms));
1282         $hms =~ /(\d+):(\d+):(\d+)/;
1283         return $1 * 3600 + $2 * 60 + $3;
1284 }
1285
1286 sub find_clock_start {
1287         my ($pos, $prev_pos) = @_;
1288
1289         # If the game is over, the clock is stopped.
1290         if (exists($pos->{'result'}) &&
1291             ($pos->{'result'} eq '1-0' ||
1292              $pos->{'result'} eq '1/2-1/2' ||
1293              $pos->{'result'} eq '0-1')) {
1294                 return;
1295         }
1296
1297         # When we don't have any moves, we assume the clock hasn't started yet.
1298         if ($pos->{'move_num'} == 1 && $pos->{'toplay'} eq 'W') {
1299                 if (defined($remoteglotconf::adjust_clocks_before_move)) {
1300                         &$remoteglotconf::adjust_clocks_before_move(\$pos->{'white_clock'}, \$pos->{'black_clock'}, 1, 'W');
1301                 }
1302                 return;
1303         }
1304
1305         # TODO(sesse): Maybe we can get the number of moves somehow else for FICS games.
1306         # The history is needed for id_for_pos.
1307         if (!exists($pos->{'history'})) {
1308                 return;
1309         }
1310
1311         my $id = id_for_pos($pos);
1312         my $clock_info = $dbh->selectrow_hashref('SELECT * FROM clock_info WHERE id=? AND COALESCE(white_clock_target, black_clock_target) >= EXTRACT(EPOCH FROM (CURRENT_TIMESTAMP - INTERVAL \'1 day\'));', undef, $id);
1313         if (defined($clock_info)) {
1314                 $pos->{'white_clock'} //= $clock_info->{'white_clock'};
1315                 $pos->{'black_clock'} //= $clock_info->{'black_clock'};
1316                 if ($pos->{'toplay'} eq 'W') {
1317                         $pos->{'white_clock_target'} = $clock_info->{'white_clock_target'};
1318                 } else {
1319                         $pos->{'black_clock_target'} = $clock_info->{'black_clock_target'};
1320                 }
1321                 return;
1322         }
1323
1324         # OK, we haven't seen this position before, so we assume the move
1325         # happened right now.
1326
1327         # See if we should do our own clock management (ie., clock information
1328         # is spurious or non-existent).
1329         if (defined($remoteglotconf::adjust_clocks_before_move)) {
1330                 my $wc = $pos->{'white_clock'} // $prev_pos->{'white_clock'};
1331                 my $bc = $pos->{'black_clock'} // $prev_pos->{'black_clock'};
1332                 if (defined($prev_pos->{'white_clock_target'})) {
1333                         $wc = $prev_pos->{'white_clock_target'} - time;
1334                 }
1335                 if (defined($prev_pos->{'black_clock_target'})) {
1336                         $bc = $prev_pos->{'black_clock_target'} - time;
1337                 }
1338                 &$remoteglotconf::adjust_clocks_before_move(\$wc, \$bc, $pos->{'move_num'}, $pos->{'toplay'});
1339                 $pos->{'white_clock'} = $wc;
1340                 $pos->{'black_clock'} = $bc;
1341         }
1342
1343         my $key = ($pos->{'toplay'} eq 'W') ? 'white_clock' : 'black_clock';
1344         if (!exists($pos->{$key})) {
1345                 # No clock information.
1346                 return;
1347         }
1348         my $time_left = $pos->{$key};
1349         my ($white_clock_target, $black_clock_target);
1350         if ($pos->{'toplay'} eq 'W') {
1351                 $white_clock_target = $pos->{'white_clock_target'} = time + $time_left;
1352         } else {
1353                 $black_clock_target = $pos->{'black_clock_target'} = time + $time_left;
1354         }
1355         local $dbh->{AutoCommit} = 0;
1356         $dbh->do('DELETE FROM clock_info WHERE id=?', undef, $id);
1357         $dbh->do('INSERT INTO clock_info (id, white_clock, black_clock, white_clock_target, black_clock_target) VALUES (?, ?, ?, ?, ?)', undef,
1358                 $id, $pos->{'white_clock'}, $pos->{'black_clock'}, $white_clock_target, $black_clock_target);
1359         $dbh->commit;
1360 }
1361
1362 sub open_engine {
1363         my ($cmdline, $tag, $cb) = @_;
1364         return undef if (!defined($cmdline));
1365         return Engine->open($cmdline, $tag, $cb);
1366 }
1367
1368 sub col_letter_to_num {
1369         return ord(shift) - ord('a');
1370 }
1371
1372 sub row_letter_to_num {
1373         return 7 - (ord(shift) - ord('1'));
1374 }
1375
1376 sub parse_uci_move {
1377         my $move = shift;
1378         my $from_col = col_letter_to_num(substr($move, 0, 1));
1379         my $from_row = row_letter_to_num(substr($move, 1, 1));
1380         my $to_col   = col_letter_to_num(substr($move, 2, 1));
1381         my $to_row   = row_letter_to_num(substr($move, 3, 1));
1382         my $promo    = substr($move, 4, 1);
1383         return ($from_row, $from_col, $to_row, $to_col, $promo);
1384 }
1385
1386 sub setoptions {
1387         my ($engine, $config) = @_;
1388         uciprint($engine, "setoption name UCI_AnalyseMode value true");
1389         uciprint($engine, "setoption name Analysis Contempt value Off");
1390         if (exists($config->{'Threads'})) {  # Threads first, because clearing hash can be multithreaded then.
1391                 uciprint($engine, "setoption name Threads value " . $config->{'Threads'});
1392         }
1393         while (my ($key, $value) = each %$config) {
1394                 next if $key eq 'Threads';
1395                 uciprint($engine, "setoption name $key value $value");
1396         }
1397 }