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_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 umask 0022;  # analysis.json should not be served to users.
  71
  72 # open the chess engine
  73 my $engine = open_engine($remoteglotconf::engine_cmdline, 'E1', sub { handle_uci(@_, 1); });
  74 my $engine2 = open_engine($remoteglotconf::engine2_cmdline, 'E2', sub { handle_uci(@_, 0); });
  75 my $last_move;
  76 my $last_text = '';
  77 my ($pos_calculating, $pos_calculating_second_engine);
  78
  79 uciprint($engine, "setoption name UCI_AnalyseMode value true");
  80 while (my ($key, $value) = each %remoteglotconf::engine_config) {
  81         uciprint($engine, "setoption name $key value $value");
  82 }
  83 uciprint($engine, "ucinewgame");
  84
  85 if (defined($engine2)) {
  86         uciprint($engine2, "setoption name UCI_AnalyseMode value true");
  87         while (my ($key, $value) = each %remoteglotconf::engine2_config) {
  88                 uciprint($engine2, "setoption name $key value $value");
  89         }
  90         uciprint($engine2, "setoption name MultiPV value 500");
  91         uciprint($engine2, "ucinewgame");
  92 }
  93
  94 print "Chess engine ready.\n";
  95
  96 # now talk to FICS
  97 my ($t, $ev1);
  98 if (defined($remoteglotconf::server)) {
  99         $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
 100         $t->input_log(\*FICSLOG);
 101         $t->open($remoteglotconf::server);
 102         $t->print($remoteglotconf::nick);
 103         $t->waitfor('/Press return to enter the server/');
 104         $t->cmd("");
 105
 106         # set some options
 107         $t->cmd("set shout 0");
 108         $t->cmd("set seek 0");
 109         $t->cmd("set style 12");
 110
 111         $ev1 = AnyEvent->io(
 112                 fh => fileno($t),
 113                 poll => 'r',
 114                 cb => sub {    # what callback to execute
 115                         while (1) {
 116                                 my $line = $t->getline(Timeout => 0, errmode => 'return');
 117                                 return if (!defined($line));
 118
 119                                 chomp $line;
 120                                 $line =~ tr/\r//d;
 121                                 handle_fics($line);
 122                         }
 123                 }
 124         );
 125 }
 126 if (defined($remoteglotconf::target)) {
 127         if ($remoteglotconf::target =~ /^https?:/) {
 128                 fetch_pgn($remoteglotconf::target);
 129         } elsif (defined($t)) {
 130                 $t->cmd("observe $remoteglotconf::target");
 131         }
 132 }
 133 if (defined($t)) {
 134         print "FICS ready.\n";
 135 }
 136
 137 # Engine events have already been set up by Engine.pm.
 138 EV::run;
 139
 140 sub handle_uci {
 141         my ($engine, $line, $primary) = @_;
 142
 143         return if $line =~ /(upper|lower)bound/;
 144
 145         $line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 146         print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
 147
 148         # If we've sent a stop command, gobble up lines until we see bestmove.
 149         return if ($engine->{'stopping'} && $line !~ /^bestmove/);
 150         $engine->{'stopping'} = 0;
 151
 152         if ($line =~ /^info/) {
 153                 my (@infos) = split / /, $line;
 154                 shift @infos;
 155
 156                 parse_infos($engine, @infos);
 157         }
 158         if ($line =~ /^id/) {
 159                 my (@ids) = split / /, $line;
 160                 shift @ids;
 161
 162                 parse_ids($engine, @ids);
 163         }
 164         output();
 165 }
 166
 167 my $getting_movelist = 0;
 168 my $pos_for_movelist = undef;
 169 my @uci_movelist = ();
 170 my @pretty_movelist = ();
 171
 172 sub handle_fics {
 173         my $line = shift;
 174         if ($line =~ /^<12> /) {
 175                 handle_position(Position->new($line));
 176                 $t->cmd("moves");
 177         }
 178         if ($line =~ /^Movelist for game /) {
 179                 my $pos = $pos_calculating;
 180                 if (defined($pos)) {
 181                         @uci_movelist = ();
 182                         @pretty_movelist = ();
 183                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 184                         $getting_movelist = 1;
 185                 }
 186         }
 187         if ($getting_movelist &&
 188             $line =~ /^\s* \d+\. \s+                     # move number
 189                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 190                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 191                      /x) {
 192                 eval {
 193                         my $uci_move;
 194                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 195                         push @uci_movelist, $uci_move;
 196                         push @pretty_movelist, $1;
 197
 198                         if (defined($2)) {
 199                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 200                                 push @uci_movelist, $uci_move;
 201                                 push @pretty_movelist, $2;
 202                         }
 203                 };
 204                 if ($@) {
 205                         warn "Error when getting FICS move history: $@";
 206                         $getting_movelist = 0;
 207                 }
 208         }
 209         if ($getting_movelist &&
 210             $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
 211                 # End of movelist.
 212                 if (defined($pos_calculating)) {
 213                         if ($pos_calculating->fen() eq $pos_for_movelist->fen()) {
 214                                 $pos_calculating->{'history'} = \@pretty_movelist;
 215                         }
 216                 }
 217                 $getting_movelist = 0;
 218         }
 219         if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 220                 my ($who, $msg) = ($1, $2);
 221
 222                 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
 223
 224                 if ($msg =~ /^fics (.*?)$/) {
 225                         $t->cmd("tell $who Executing '$1' on FICS.");
 226                         $t->cmd($1);
 227                 } elsif ($msg =~ /^uci (.*?)$/) {
 228                         $t->cmd("tell $who Sending '$1' to the engine.");
 229                         print { $engine->{'write'} } "$1\n";
 230                 } elsif ($msg =~ /^pgn (.*?)$/) {
 231                         my $url = $1;
 232                         $t->cmd("tell $who Starting to poll '$url'.");
 233                         fetch_pgn($url);
 234                 } elsif ($msg =~ /^stoppgn$/) {
 235                         $t->cmd("tell $who Stopping poll.");
 236                         $stop_pgn_fetch = 1;
 237                         $http_timer = undef;
 238                 } elsif ($msg =~ /^quit$/) {
 239                         $t->cmd("tell $who Bye bye.");
 240                         exit;
 241                 } else {
 242                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 243                 }
 244         }
 245         #print "FICS: [$line]\n";
 246 }
 247
 248 # Starts periodic fetching of PGNs from the given URL.
 249 sub fetch_pgn {
 250         my ($url) = @_;
 251         AnyEvent::HTTP::http_get($url, sub {
 252                 handle_pgn(@_, $url);
 253         });
 254 }
 255
 256 my ($last_pgn_white, $last_pgn_black);
 257 my @last_pgn_uci_moves = ();
 258 my $pgn_hysteresis_counter = 0;
 259
 260 sub handle_pgn {
 261         my ($body, $header, $url) = @_;
 262
 263         if ($stop_pgn_fetch) {
 264                 $stop_pgn_fetch = 0;
 265                 $http_timer = undef;
 266                 return;
 267         }
 268
 269         my $pgn = Chess::PGN::Parse->new(undef, $body);
 270         if (!defined($pgn)) {
 271                 warn "Error in parsing PGN from $url [body='$body']\n";
 272         } elsif (!$pgn->read_game()) {
 273                 warn "Error in reading PGN game from $url [body='$body']\n";
 274         } elsif ($body !~ /^\[/) {
 275                 warn "Malformed PGN from $url [body='$body']\n";
 276         } else {
 277                 eval {
 278                         # Skip to the right game.
 279                         while (defined($remoteglotconf::pgn_filter) &&
 280                                !&$remoteglotconf::pgn_filter($pgn)) {
 281                                 $pgn->read_game() or die "Out of games during filtering";
 282                         }
 283
 284                         $pgn->parse_game({ save_comments => 'yes' });
 285                         my $white = $pgn->white;
 286                         my $black = $pgn->black;
 287                         $white =~ s/,.*//;  # Remove first name.
 288                         $black =~ s/,.*//;  # Remove first name.
 289                         my $tags = $pgn->tags();
 290                         my $pos;
 291                         if (exists($tags->{'FEN'})) {
 292                                 $pos = Position->from_fen($tags->{'FEN'});
 293                                 $pos->{'player_w'} = $white;
 294                                 $pos->{'player_b'} = $black;
 295                                 $pos->{'start_fen'} = $tags->{'FEN'};
 296                         } else {
 297                                 $pos = Position->start_pos($white, $black);
 298                         }
 299                         if (exists($tags->{'Variant'}) &&
 300                             $tags->{'Variant'} =~ /960|fischer/i) {
 301                                 $pos->{'chess960'} = 1;
 302                         }
 303                         my $moves = $pgn->moves;
 304                         my @uci_moves = ();
 305                         my @repretty_moves = ();
 306                         for my $move (@$moves) {
 307                                 my ($npos, $uci_move) = $pos->make_pretty_move($move);
 308                                 push @uci_moves, $uci_move;
 309
 310                                 # Re-prettyprint the move.
 311                                 my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($uci_move);
 312                                 my ($pretty, undef) = $pos->{'board'}->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 313                                 push @repretty_moves, $pretty;
 314                                 $pos = $npos;
 315                         }
 316                         if ($pgn->result eq '1-0' || $pgn->result eq '1/2-1/2' || $pgn->result eq '0-1') {
 317                                 $pos->{'result'} = $pgn->result;
 318                         }
 319                         $pos->{'history'} = \@repretty_moves;
 320
 321                         extract_clock($pgn, $pos);
 322
 323                         # Sometimes, PGNs lose a move or two for a short while,
 324                         # or people push out new ones non-atomically.
 325                         # Thus, if we PGN doesn't change names but becomes
 326                         # shorter, we mistrust it for a few seconds.
 327                         my $trust_pgn = 1;
 328                         if (defined($last_pgn_white) && defined($last_pgn_black) &&
 329                             $last_pgn_white eq $pgn->white &&
 330                             $last_pgn_black eq $pgn->black &&
 331                             scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 332                                 if (++$pgn_hysteresis_counter < 3) {
 333                                         $trust_pgn = 0;
 334                                 }
 335                         }
 336                         if ($trust_pgn) {
 337                                 $last_pgn_white = $pgn->white;
 338                                 $last_pgn_black = $pgn->black;
 339                                 @last_pgn_uci_moves = @uci_moves;
 340                                 $pgn_hysteresis_counter = 0;
 341                                 handle_position($pos);
 342                         }
 343                 };
 344                 if ($@) {
 345                         warn "Error in parsing moves from $url: $@\n";
 346                 }
 347         }
 348
 349         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 350                 fetch_pgn($url);
 351         });
 352 }
 353
 354 sub handle_position {
 355         my ($pos) = @_;
 356         find_clock_start($pos, $pos_calculating);
 357
 358         # If we're already chewing on this and there's nothing else in the queue,
 359         # ignore it.
 360         if (defined($pos_calculating) && $pos->fen() eq $pos_calculating->fen()) {
 361                 $pos_calculating->{'result'} = $pos->{'result'};
 362                 for my $key ('white_clock', 'black_clock', 'white_clock_target', 'black_clock_target') {
 363                         $pos_calculating->{$key} //= $pos->{$key};
 364                 }
 365                 return;
 366         }
 367
 368         # If we're already thinking on something, stop and wait for the engine
 369         # to approve.
 370         if (defined($pos_calculating)) {
 371                 # Store the final data we have for this position in the history,
 372                 # with the precise clock information we just got from the new
 373                 # position. (Historic positions store the clock at the end of
 374                 # the position.)
 375                 #
 376                 # Do not output anything new to the main analysis; that's
 377                 # going to be obsolete really soon.
 378                 $pos_calculating->{'white_clock'} = $pos->{'white_clock'};
 379                 $pos_calculating->{'black_clock'} = $pos->{'black_clock'};
 380                 delete $pos_calculating->{'white_clock_target'};
 381                 delete $pos_calculating->{'black_clock_target'};
 382                 output_json(1);
 383
 384                 # Ask the engine to stop; we will throw away its data until it
 385                 # sends us "bestmove", signaling the end of it.
 386                 $engine->{'stopping'} = 1;
 387                 uciprint($engine, "stop");
 388         }
 389
 390         # It's wrong to just give the FEN (the move history is useful,
 391         # and per the UCI spec, we should really have sent "ucinewgame"),
 392         # but it's easier, and it works around a Stockfish repetition issue.
 393         if ($engine->{'chess960'} != $pos->is_chess960()) {
 394                 uciprint($engine, "setoption UCI_Chess960 " . ($pos->is_chess960() ? 'true' : 'false'));
 395                 $engine->{'chess960'} = $pos->is_chess960();
 396         }
 397         uciprint($engine, "position fen " . $pos->fen());
 398         uciprint($engine, "go infinite");
 399         $pos_calculating = $pos;
 400
 401         if (defined($engine2)) {
 402                 if (defined($pos_calculating_second_engine)) {
 403                         $engine2->{'stopping'} = 1;
 404                         uciprint($engine2, "stop");
 405                 }
 406                 if ($engine2->{'chess960'} != $pos->is_chess960()) {
 407                         uciprint($engine2, "setoption UCI_Chess960 " . ($pos->is_chess960() ? 'true' : 'false'));
 408                         $engine2->{'chess960'} = $pos->is_chess960();
 409                 }
 410                 uciprint($engine2, "position fen " . $pos->fen());
 411                 uciprint($engine2, "go infinite");
 412                 $pos_calculating_second_engine = $pos;
 413                 $engine2->{'info'} = {};
 414         }
 415
 416         $engine->{'info'} = {};
 417         $last_move = time;
 418
 419         schedule_tb_lookup();
 420
 421         #
 422         # Output a command every move to note that we're
 423         # still paying attention -- this is a good tradeoff,
 424         # since if no move has happened in the last half
 425         # hour, the analysis/relay has most likely stopped
 426         # and we should stop hogging server resources.
 427         #
 428         if (defined($t)) {
 429                 $t->cmd("date");
 430         }
 431 }
 432
 433 sub parse_infos {
 434         my ($engine, @x) = @_;
 435         my $mpv = '';
 436
 437         my $info = $engine->{'info'};
 438
 439         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 440         for my $i (0..$#x - 1) {
 441                 if ($x[$i] eq 'multipv') {
 442                         $mpv = $x[$i + 1];
 443                         next;
 444                 }
 445         }
 446
 447         while (scalar @x > 0) {
 448                 if ($x[0] eq 'multipv') {
 449                         # Dealt with above
 450                         shift @x;
 451                         shift @x;
 452                         next;
 453                 }
 454                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 455                         my $key = shift @x;
 456                         my $value = shift @x;
 457                         $info->{$key} = $value;
 458                         next;
 459                 }
 460                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 461                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 462                     $x[0] eq 'tbhits') {
 463                         my $key = shift @x;
 464                         my $value = shift @x;
 465                         $info->{$key . $mpv} = $value;
 466                         next;
 467                 }
 468                 if ($x[0] eq 'score') {
 469                         shift @x;
 470
 471                         delete $info->{'score_cp' . $mpv};
 472                         delete $info->{'score_mate' . $mpv};
 473
 474                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 475                                 if ($x[0] eq 'cp') {
 476                                         shift @x;
 477                                         $info->{'score_cp' . $mpv} = shift @x;
 478                                 } elsif ($x[0] eq 'mate') {
 479                                         shift @x;
 480                                         $info->{'score_mate' . $mpv} = shift @x;
 481                                 } else {
 482                                         shift @x;
 483                                 }
 484                         }
 485                         next;
 486                 }
 487                 if ($x[0] eq 'pv') {
 488                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 489                         last;
 490                 }
 491                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 492                         last;
 493                 }
 494
 495                 #print "unknown info '$x[0]', trying to recover...\n";
 496                 #shift @x;
 497                 die "Unknown info '" . join(',', @x) . "'";
 498
 499         }
 500 }
 501
 502 sub parse_ids {
 503         my ($engine, @x) = @_;
 504
 505         while (scalar @x > 0) {
 506                 if ($x[0] eq 'name') {
 507                         my $value = join(' ', @x);
 508                         $engine->{'id'}{'author'} = $value;
 509                         last;
 510                 }
 511
 512                 # unknown
 513                 shift @x;
 514         }
 515 }
 516
 517 sub prettyprint_pv_no_cache {
 518         my ($board, @pvs) = @_;
 519
 520         if (scalar @pvs == 0 || !defined($pvs[0])) {
 521                 return ();
 522         }
 523
 524         my $pv = shift @pvs;
 525         my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($pv);
 526         my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 527         return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
 528 }
 529
 530 sub prettyprint_pv {
 531         my ($pos, @pvs) = @_;
 532
 533         my $cachekey = join('', @pvs);
 534         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 535                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 536         } else {
 537                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 538                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 539                 return @res;
 540         }
 541 }
 542
 543 my %tbprobe_cache = ();
 544
 545 sub complete_using_tbprobe {
 546         my ($pos, $info, $mpv) = @_;
 547
 548         # We need Fathom installed to do standalone TB probes.
 549         return if (!defined($remoteglotconf::fathom_cmdline));
 550
 551         # If we already have a mate, don't bother; in some cases, it would even be
 552         # better than a tablebase score.
 553         return if defined($info->{'score_mate' . $mpv});
 554
 555         # If we have a draw or near-draw score, there's also not much interesting
 556         # we could add from a tablebase. We only really want mates.
 557         return if ($info->{'score_cp' . $mpv} >= -12250 && $info->{'score_cp' . $mpv} <= 12250);
 558
 559         # Run through the PV until we are at a 6-man position.
 560         # TODO: We could in theory only have 5-man data.
 561         my @pv = @{$info->{'pv' . $mpv}};
 562         my $key = $pos->fen() . " " . join('', @pv);
 563         my @moves = ();
 564         if (exists($tbprobe_cache{$key})) {
 565                 @moves = @{$tbprobe_cache{$key}};
 566         } else {
 567                 if ($mpv ne '') {
 568                         # Force doing at least one move of the PV.
 569                         my $move = shift @pv;
 570                         push @moves, $move;
 571                         $pos = $pos->make_move(parse_uci_move($move));
 572                 }
 573
 574                 while ($pos->num_pieces() > 6 && $#pv > -1) {
 575                         my $move = shift @pv;
 576                         push @moves, $move;
 577                         $pos = $pos->make_move(parse_uci_move($move));
 578                 }
 579
 580                 return if ($pos->num_pieces() > 6);
 581
 582                 my $fen = $pos->fen();
 583                 my $pgn_text = `fathom --path=/srv/syzygy "$fen"`;
 584                 my $pgn = Chess::PGN::Parse->new(undef, $pgn_text);
 585                 return if (!defined($pgn) || !$pgn->read_game() || ($pgn->result ne '0-1' && $pgn->result ne '1-0'));
 586                 $pgn->quick_parse_game;
 587                 $info->{'pv' . $mpv} = \@moves;
 588
 589                 # Splice the PV from the tablebase onto what we have so far.
 590                 for my $move (@{$pgn->moves}) {
 591                         last if $move eq '#';
 592                         my $uci_move;
 593                         ($pos, $uci_move) = $pos->make_pretty_move($move);
 594                         push @moves, $uci_move;
 595                 }
 596
 597                 $tbprobe_cache{$key} = \@moves;
 598         }
 599
 600         $info->{'pv' . $mpv} = \@moves;
 601
 602         my $matelen = int((1 + scalar @moves) / 2);
 603         if ((scalar @moves) % 2 == 0) {
 604                 $info->{'score_mate' . $mpv} = -$matelen;
 605         } else {
 606                 $info->{'score_mate' . $mpv} = $matelen;
 607         }
 608 }
 609
 610 sub output {
 611         #return;
 612
 613         return if (!defined($pos_calculating));
 614
 615         # Don't update too often.
 616         my $age = Time::HiRes::tv_interval($latest_update);
 617         if ($age < $remoteglotconf::update_max_interval) {
 618                 my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
 619                 $output_timer = AnyEvent->timer(after => $wait, cb => \&output);
 620                 return;
 621         }
 622
 623         my $info = $engine->{'info'};
 624
 625         #
 626         # If we have tablebase data from a previous lookup, replace the
 627         # engine data with the data from the tablebase.
 628         #
 629         my $fen = $pos_calculating->fen();
 630         if (exists($tb_cache{$fen})) {
 631                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 632                         delete $info->{$key . '1'};
 633                         delete $info->{$key};
 634                 }
 635                 $info->{'nodes'} = 0;
 636                 $info->{'nps'} = 0;
 637                 $info->{'depth'} = 0;
 638                 $info->{'seldepth'} = 0;
 639                 $info->{'tbhits'} = 0;
 640
 641                 my $t = $tb_cache{$fen};
 642                 my $pv = $t->{'pv'};
 643                 my $matelen = int((1 + $t->{'score'}) / 2);
 644                 if ($t->{'result'} eq '1/2-1/2') {
 645                         $info->{'score_cp'} = 0;
 646                 } elsif ($t->{'result'} eq '1-0') {
 647                         if ($pos_calculating->{'toplay'} eq 'B') {
 648                                 $info->{'score_mate'} = -$matelen;
 649                         } else {
 650                                 $info->{'score_mate'} = $matelen;
 651                         }
 652                 } else {
 653                         if ($pos_calculating->{'toplay'} eq 'B') {
 654                                 $info->{'score_mate'} = $matelen;
 655                         } else {
 656                                 $info->{'score_mate'} = -$matelen;
 657                         }
 658                 }
 659                 $info->{'pv'} = $pv;
 660                 $info->{'tablebase'} = 1;
 661         } else {
 662                 $info->{'tablebase'} = 0;
 663         }
 664
 665         #
 666         # Some programs _always_ report MultiPV, even with only one PV.
 667         # In this case, we simply use that data as if MultiPV was never
 668         # specified.
 669         #
 670         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 671                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 672                         if (exists($info->{$key . '1'})) {
 673                                 $info->{$key} = $info->{$key . '1'};
 674                         } else {
 675                                 delete $info->{$key};
 676                         }
 677                 }
 678         }
 679
 680         #
 681         # Check the PVs first. if they're invalid, just wait, as our data
 682         # is most likely out of sync. This isn't a very good solution, as
 683         # it can frequently miss stuff, but it's good enough for most users.
 684         #
 685         eval {
 686                 my $dummy;
 687                 if (exists($info->{'pv'})) {
 688                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 689                 }
 690
 691                 my $mpv = 1;
 692                 while (exists($info->{'pv' . $mpv})) {
 693                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 694                         ++$mpv;
 695                 }
 696         };
 697         if ($@) {
 698                 $engine->{'info'} = {};
 699                 return;
 700         }
 701
 702         # Now do our own Syzygy tablebase probes to convert scores like +123.45 to mate.
 703         if (exists($info->{'pv'})) {
 704                 complete_using_tbprobe($pos_calculating, $info, '');
 705         }
 706
 707         my $mpv = 1;
 708         while (exists($info->{'pv' . $mpv})) {
 709                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 710                 ++$mpv;
 711         }
 712
 713         output_screen();
 714         output_json(0);
 715         $latest_update = [Time::HiRes::gettimeofday];
 716 }
 717
 718 sub output_screen {
 719         my $info = $engine->{'info'};
 720         my $id = $engine->{'id'};
 721
 722         my $text = 'Analysis';
 723         if ($pos_calculating->{'last_move'} ne 'none') {
 724                 if ($pos_calculating->{'toplay'} eq 'W') {
 725                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 726                 } else {
 727                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 728                 }
 729                 if (exists($id->{'name'})) {
 730                         $text .= ',';
 731                 }
 732         }
 733
 734         if (exists($id->{'name'})) {
 735                 $text .= " by $id->{'name'}:\n\n";
 736         } else {
 737                 $text .= ":\n\n";
 738         }
 739
 740         return unless (exists($pos_calculating->{'board'}));
 741
 742         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 743                 # multi-PV
 744                 my $mpv = 1;
 745                 while (exists($info->{'pv' . $mpv})) {
 746                         $text .= sprintf "  PV%2u", $mpv;
 747                         my $score = short_score($info, $pos_calculating, $mpv);
 748                         $text .= "  ($score)" if (defined($score));
 749
 750                         my $tbhits = '';
 751                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 752                                 if ($info->{'tbhits' . $mpv} == 1) {
 753                                         $tbhits = ", 1 tbhit";
 754                                 } else {
 755                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 756                                 }
 757                         }
 758
 759                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 760                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 761                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 762                         }
 763
 764                         $text .= ":\n";
 765                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 766                         $text .= "\n";
 767                         ++$mpv;
 768                 }
 769         } else {
 770                 # single-PV
 771                 my $score = long_score($info, $pos_calculating, '');
 772                 $text .= "  $score\n" if defined($score);
 773                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 774                 $text .=  "\n";
 775
 776                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 777                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 778                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 779                 }
 780                 if (exists($info->{'seldepth'})) {
 781                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 782                 }
 783                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 784                         if ($info->{'tbhits'} == 1) {
 785                                 $text .= ", one Syzygy hit";
 786                         } else {
 787                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 788                         }
 789                 }
 790                 $text .= "\n\n";
 791         }
 792
 793         #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
 794
 795         my @refutation_lines = ();
 796         if (defined($engine2)) {
 797                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 798                         my $info = $engine2->{'info'};
 799                         last if (!exists($info->{'pv' . $mpv}));
 800                         eval {
 801                                 complete_using_tbprobe($pos_calculating_second_engine, $info, $mpv);
 802                                 my $pv = $info->{'pv' . $mpv};
 803                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 804                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 805                                 if (scalar @pretty_pv > 5) {
 806                                         @pretty_pv = @pretty_pv[0..4];
 807                                         push @pretty_pv, "...";
 808                                 }
 809                                 my $key = $pretty_move;
 810                                 my $line = sprintf("  %-6s %6s %3s  %s",
 811                                         $pretty_move,
 812                                         short_score($info, $pos_calculating_second_engine, $mpv),
 813                                         "d" . $info->{'depth' . $mpv},
 814                                         join(', ', @pretty_pv));
 815                                 push @refutation_lines, [ $key, $line ];
 816                         };
 817                 }
 818         }
 819
 820         if ($#refutation_lines >= 0) {
 821                 $text .= "Shallow search of all legal moves:\n\n";
 822                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 823                         $text .= $line->[1] . "\n";
 824                 }
 825                 $text .= "\n\n";
 826         }
 827
 828         if ($last_text ne $text) {
 829                 print "\e[H\e[2J"; # clear the screen
 830                 print $text;
 831                 $last_text = $text;
 832         }
 833 }
 834
 835 sub output_json {
 836         my $historic_json_only = shift;
 837         my $info = $engine->{'info'};
 838
 839         my $json = {};
 840         $json->{'position'} = $pos_calculating->to_json_hash();
 841         $json->{'engine'} = $engine->{'id'};
 842         if (defined($remoteglotconf::engine_url)) {
 843                 $json->{'engine'}{'url'} = $remoteglotconf::engine_url;
 844         }
 845         if (defined($remoteglotconf::engine_details)) {
 846                 $json->{'engine'}{'details'} = $remoteglotconf::engine_details;
 847         }
 848         my @grpc_backends = ();
 849         if (defined($remoteglotconf::engine_grpc_backend)) {
 850                 push @grpc_backends, $remoteglotconf::engine_grpc_backend;
 851         }
 852         if (defined($remoteglotconf::engine2_grpc_backend)) {
 853                 push @grpc_backends, $remoteglotconf::engine2_grpc_backend;
 854         }
 855         $json->{'internal'}{'grpc_backends'} = \@grpc_backends;
 856         if (defined($remoteglotconf::move_source)) {
 857                 $json->{'move_source'} = $remoteglotconf::move_source;
 858         }
 859         if (defined($remoteglotconf::move_source_url)) {
 860                 $json->{'move_source_url'} = $remoteglotconf::move_source_url;
 861         }
 862         $json->{'score'} = score_digest($info, $pos_calculating, '');
 863         $json->{'using_lomonosov'} = defined($remoteglotconf::tb_serial_key);
 864
 865         $json->{'nodes'} = $info->{'nodes'};
 866         $json->{'nps'} = $info->{'nps'};
 867         $json->{'depth'} = $info->{'depth'};
 868         $json->{'tbhits'} = $info->{'tbhits'};
 869         $json->{'seldepth'} = $info->{'seldepth'};
 870         $json->{'tablebase'} = $info->{'tablebase'};
 871         $json->{'pv'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 872
 873         my %refutation_lines = ();
 874         my @refutation_lines = ();
 875         if (defined($engine2)) {
 876                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 877                         my $info = $engine2->{'info'};
 878                         my $pretty_move = "";
 879                         my @pretty_pv = ();
 880                         last if (!exists($info->{'pv' . $mpv}));
 881
 882                         eval {
 883                                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 884                                 my $pv = $info->{'pv' . $mpv};
 885                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 886                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 887                                 $refutation_lines{$pretty_move} = {
 888                                         depth => $info->{'depth' . $mpv},
 889                                         score => score_digest($info, $pos_calculating, $mpv),
 890                                         move => $pretty_move,
 891                                         pv => \@pretty_pv,
 892                                 };
 893                         };
 894                 }
 895         }
 896         $json->{'refutation_lines'} = \%refutation_lines;
 897
 898         # Piece together historic score information, to the degree we have it.
 899         if (!$historic_json_only && exists($pos_calculating->{'history'})) {
 900                 my %score_history = ();
 901
 902                 local $dbh->{AutoCommit} = 0;
 903                 my $q = $dbh->prepare('SELECT * FROM scores WHERE id=?');
 904                 my $pos;
 905                 if (exists($pos_calculating->{'start_fen'})) {
 906                         $pos = Position->from_fen($pos_calculating->{'start_fen'});
 907                 } else {
 908                         $pos = Position->start_pos('white', 'black');
 909                 }
 910                 my $halfmove_num = 0;
 911                 for my $move (@{$pos_calculating->{'history'}}) {
 912                         my $id = id_for_pos($pos, $halfmove_num);
 913                         my $ref = $dbh->selectrow_hashref($q, undef, $id);
 914                         if (defined($ref)) {
 915                                 $score_history{$halfmove_num} = [
 916                                         $ref->{'score_type'},
 917                                         $ref->{'score_value'}
 918                                 ];
 919                         }
 920                         ++$halfmove_num;
 921                         ($pos) = $pos->make_pretty_move($move);
 922                 }
 923                 $q->finish;
 924                 $dbh->commit;
 925
 926                 # If at any point we are missing 10 consecutive moves,
 927                 # truncate the history there. This is so we don't get into
 928                 # a situation where we e.g. start analyzing at move 45,
 929                 # but we have analysis for 1. e4 from some completely different game
 930                 # and thus show a huge hole.
 931                 my $consecutive_missing = 0;
 932                 my $truncate_until = 0;
 933                 for (my $i = $halfmove_num; $i --> 0; ) {
 934                         if ($consecutive_missing >= 10) {
 935                                 delete $score_history{$i};
 936                                 next;
 937                         }
 938                         if (exists($score_history{$i})) {
 939                                 $consecutive_missing = 0;
 940                         } else {
 941                                 ++$consecutive_missing;
 942                         }
 943                 }
 944
 945                 $json->{'score_history'} = \%score_history;
 946         }
 947
 948         # Give out a list of other games going on. (Empty is fine.)
 949         # TODO: Don't bother reading our own file, the data will be stale anyway.
 950         if (!$historic_json_only) {
 951                 my @games = ();
 952
 953                 my $q = $dbh->prepare('SELECT * FROM current_games ORDER BY priority DESC, id');
 954                 $q->execute;
 955                 while (my $ref = $q->fetchrow_hashref) {
 956                         eval {
 957                                 my $other_game_contents = File::Slurp::read_file($ref->{'json_path'});
 958                                 my $other_game_json = JSON::XS::decode_json($other_game_contents);
 959
 960                                 die "Missing position" if (!exists($other_game_json->{'position'}));
 961                                 my $white = $other_game_json->{'position'}{'player_w'} // die 'Missing white';
 962                                 my $black = $other_game_json->{'position'}{'player_b'} // die 'Missing black';
 963
 964                                 my $game = {
 965                                         id => $ref->{'id'},
 966                                         name => "$white–$black",
 967                                         url => $ref->{'url'},
 968                                         hashurl => $ref->{'hash_url'},
 969                                 };
 970                                 if (defined($other_game_json->{'position'}{'result'})) {
 971                                         $game->{'result'} = $other_game_json->{'position'}{'result'};
 972                                 } else {
 973                                         $game->{'score'} = $other_game_json->{'score'};
 974                                 }
 975                                 push @games, $game;
 976                         };
 977                         if ($@) {
 978                                 warn "Could not add external game " . $ref->{'json_path'} . ": $@";
 979                         }
 980                 }
 981
 982                 if (scalar @games > 0) {
 983                         $json->{'games'} = \@games;
 984                 }
 985         }
 986
 987         my $json_enc = JSON::XS->new;
 988         $json_enc->canonical(1);
 989         my $encoded = $json_enc->encode($json);
 990         unless ($historic_json_only || !defined($remoteglotconf::json_output) ||
 991                 (defined($last_written_json) && $last_written_json eq $encoded)) {
 992                 atomic_set_contents($remoteglotconf::json_output, $encoded);
 993                 $last_written_json = $encoded;
 994         }
 995
 996         if (exists($pos_calculating->{'history'}) &&
 997             defined($remoteglotconf::json_history_dir)) {
 998                 my $id = id_for_pos($pos_calculating);
 999                 my $filename = $remoteglotconf::json_history_dir . "/" . $id . ".json";
1000
1001                 # Overwrite old analysis (assuming it exists at all) if we're
1002                 # using a different engine, or if we've calculated deeper.
1003                 # nodes is used as a tiebreaker. Don't bother about Multi-PV
1004                 # data; it's not that important.
1005                 my ($old_engine, $old_depth, $old_nodes) = get_json_analysis_stats($id);
1006                 my $new_depth = $json->{'depth'} // 0;
1007                 my $new_nodes = $json->{'nodes'} // 0;
1008                 if (!defined($old_engine) ||
1009                     $old_engine ne $json->{'engine'}{'name'} ||
1010                     $new_depth > $old_depth ||
1011                     ($new_depth == $old_depth && $new_nodes >= $old_nodes)) {
1012                         atomic_set_contents($filename, $encoded);
1013                         if (defined($json->{'score'})) {
1014                                 $dbh->do('INSERT INTO scores (id, score_type, score_value, engine, depth, nodes) VALUES (?,?,?,?,?,?) ' .
1015                                          '    ON CONFLICT (id) DO UPDATE SET ' .
1016                                          '        score_type=EXCLUDED.score_type, ' .
1017                                          '        score_value=EXCLUDED.score_value, ' .
1018                                          '        engine=EXCLUDED.engine, ' .
1019                                          '        depth=EXCLUDED.depth, ' .
1020                                          '        nodes=EXCLUDED.nodes',
1021                                         undef,
1022                                         $id, $json->{'score'}[0], $json->{'score'}[1],
1023                                         $json->{'engine'}{'name'}, $new_depth, $new_nodes);
1024                         }
1025                 }
1026         }
1027 }
1028
1029 sub atomic_set_contents {
1030         my ($filename, $contents) = @_;
1031
1032         open my $fh, ">", $filename . ".tmp"
1033                 or return;
1034         print $fh $contents;
1035         close $fh;
1036         rename($filename . ".tmp", $filename);
1037 }
1038
1039 sub id_for_pos {
1040         my ($pos, $halfmove_num) = @_;
1041
1042         $halfmove_num //= scalar @{$pos->{'history'}};
1043         (my $fen = $pos->fen()) =~ tr,/ ,-_,;
1044         return "move$halfmove_num-$fen";
1045 }
1046
1047 sub get_json_analysis_stats {
1048         my $id = shift;
1049         my $ref = $dbh->selectrow_hashref('SELECT * FROM scores WHERE id=?', undef, $id);
1050         if (defined($ref)) {
1051                 return ($ref->{'engine'}, $ref->{'depth'}, $ref->{'nodes'});
1052         } else {
1053                 return ('', 0, 0);
1054         }
1055 }
1056
1057 sub uciprint {
1058         my ($engine, $msg) = @_;
1059         $engine->print($msg);
1060         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
1061 }
1062
1063 sub short_score {
1064         my ($info, $pos, $mpv) = @_;
1065
1066         my $invert = ($pos->{'toplay'} eq 'B');
1067         if (defined($info->{'score_mate' . $mpv})) {
1068                 if ($invert) {
1069                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
1070                 } else {
1071                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
1072                 }
1073         } else {
1074                 if (exists($info->{'score_cp' . $mpv})) {
1075                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1076                         if ($score == 0) {
1077                                 if ($info->{'tablebase'}) {
1078                                         return "TB draw";
1079                                 } else {
1080                                         return " 0.00";
1081                                 }
1082                         }
1083                         if ($invert) {
1084                                 $score = -$score;
1085                         }
1086                         return sprintf "%+5.2f", $score;
1087                 }
1088         }
1089
1090         return undef;
1091 }
1092
1093 # Sufficient for computing long_score, short_score, plot_score and
1094 # (with side-to-play information) score_sort_key.
1095 sub score_digest {
1096         my ($info, $pos, $mpv) = @_;
1097
1098         if (defined($info->{'score_mate' . $mpv})) {
1099                 my $mate = $info->{'score_mate' . $mpv};
1100                 if ($pos->{'toplay'} eq 'B') {
1101                         $mate = -$mate;
1102                 }
1103                 return ['m', $mate];
1104         } else {
1105                 if (exists($info->{'score_cp' . $mpv})) {
1106                         my $score = $info->{'score_cp' . $mpv};
1107                         if ($pos->{'toplay'} eq 'B') {
1108                                 $score = -$score;
1109                         }
1110                         if ($score == 0 && $info->{'tablebase'}) {
1111                                 return ['d', undef];
1112                         } else {
1113                                 return ['cp', int($score)];
1114                         }
1115                 }
1116         }
1117
1118         return undef;
1119 }
1120
1121 sub long_score {
1122         my ($info, $pos, $mpv) = @_;
1123
1124         if (defined($info->{'score_mate' . $mpv})) {
1125                 my $mate = $info->{'score_mate' . $mpv};
1126                 if ($pos->{'toplay'} eq 'B') {
1127                         $mate = -$mate;
1128                 }
1129                 if ($mate > 0) {
1130                         return sprintf "White mates in %u", $mate;
1131                 } else {
1132                         return sprintf "Black mates in %u", -$mate;
1133                 }
1134         } else {
1135                 if (exists($info->{'score_cp' . $mpv})) {
1136                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1137                         if ($score == 0) {
1138                                 if ($info->{'tablebase'}) {
1139                                         return "Theoretical draw";
1140                                 } else {
1141                                         return "Score:  0.00";
1142                                 }
1143                         }
1144                         if ($pos->{'toplay'} eq 'B') {
1145                                 $score = -$score;
1146                         }
1147                         return sprintf "Score: %+5.2f", $score;
1148                 }
1149         }
1150
1151         return undef;
1152 }
1153
1154 # For graphs; a single number in centipawns, capped at +/- 500.
1155 sub plot_score {
1156         my ($info, $pos, $mpv) = @_;
1157
1158         my $invert = ($pos->{'toplay'} eq 'B');
1159         if (defined($info->{'score_mate' . $mpv})) {
1160                 my $mate = $info->{'score_mate' . $mpv};
1161                 if ($invert) {
1162                         $mate = -$mate;
1163                 }
1164                 if ($mate > 0) {
1165                         return 500;
1166                 } else {
1167                         return -500;
1168                 }
1169         } else {
1170                 if (exists($info->{'score_cp' . $mpv})) {
1171                         my $score = $info->{'score_cp' . $mpv};
1172                         if ($invert) {
1173                                 $score = -$score;
1174                         }
1175                         $score = 500 if ($score > 500);
1176                         $score = -500 if ($score < -500);
1177                         return int($score);
1178                 }
1179         }
1180
1181         return undef;
1182 }
1183
1184 my %book_cache = ();
1185 sub book_info {
1186         my ($fen, $board, $toplay) = @_;
1187
1188         if (exists($book_cache{$fen})) {
1189                 return $book_cache{$fen};
1190         }
1191
1192         my $ret = `./booklook $fen`;
1193         return "" if ($ret =~ /Not found/ || $ret eq '');
1194
1195         my @moves = ();
1196
1197         for my $m (split /\n/, $ret) {
1198                 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
1199
1200                 my $pmove;
1201                 if ($move eq '')  {
1202                         $pmove = '(current)';
1203                 } else {
1204                         ($pmove) = prettyprint_pv_no_cache($board, $move);
1205                         $pmove .= $annotation;
1206                 }
1207
1208                 my $score;
1209                 if ($toplay eq 'W') {
1210                         $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
1211                 } else {
1212                         $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
1213                 }
1214                 my $n = $win + $draw + $lose;
1215
1216                 my $percent;
1217                 if ($n == 0) {
1218                         $percent = "     ";
1219                 } else {
1220                         $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
1221                 }
1222
1223                 push @moves, [ $pmove, $n, $percent, $rating ];
1224         }
1225
1226         @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
1227
1228         my $text = "Book moves:\n\n              Perf.     N     Rating\n\n";
1229         for my $m (@moves) {
1230                 $text .= sprintf "  %-10s %s   %6u    %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
1231         }
1232
1233         return $text;
1234 }
1235
1236 sub extract_clock {
1237         my ($pgn, $pos) = @_;
1238
1239         # Look for extended PGN clock tags.
1240         my $tags = $pgn->tags;
1241         if (exists($tags->{'WhiteClock'}) && exists($tags->{'BlackClock'})) {
1242                 $pos->{'white_clock'} = hms_to_sec($tags->{'WhiteClock'});
1243                 $pos->{'black_clock'} = hms_to_sec($tags->{'BlackClock'});
1244                 return;
1245         }
1246
1247         # Look for TCEC-style time comments.
1248         my $moves = $pgn->moves;
1249         my $comments = $pgn->comments;
1250         my $last_black_move = int((scalar @$moves) / 2);
1251         my $last_white_move = int((1 + scalar @$moves) / 2);
1252
1253         my $black_key = $last_black_move . "b";
1254         my $white_key = $last_white_move . "w";
1255
1256         if (exists($comments->{$white_key}) &&
1257             exists($comments->{$black_key}) &&
1258             $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/ &&
1259             $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/) {
1260                 $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1261                 $pos->{'white_clock'} = hms_to_sec($1);
1262                 $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1263                 $pos->{'black_clock'} = hms_to_sec($1);
1264                 return;
1265         }
1266
1267         delete $pos->{'white_clock'};
1268         delete $pos->{'black_clock'};
1269 }
1270
1271 sub hms_to_sec {
1272         my $hms = shift;
1273         return undef if (!defined($hms));
1274         $hms =~ /(\d+):(\d+):(\d+)/;
1275         return $1 * 3600 + $2 * 60 + $3;
1276 }
1277
1278 sub find_clock_start {
1279         my ($pos, $prev_pos) = @_;
1280
1281         # If the game is over, the clock is stopped.
1282         if (exists($pos->{'result'}) &&
1283             ($pos->{'result'} eq '1-0' ||
1284              $pos->{'result'} eq '1/2-1/2' ||
1285              $pos->{'result'} eq '0-1')) {
1286                 return;
1287         }
1288
1289         # When we don't have any moves, we assume the clock hasn't started yet.
1290         if ($pos->{'move_num'} == 1 && $pos->{'toplay'} eq 'W') {
1291                 if (defined($remoteglotconf::adjust_clocks_before_move)) {
1292                         &$remoteglotconf::adjust_clocks_before_move(\$pos->{'white_clock'}, \$pos->{'black_clock'}, 1, 'W');
1293                 }
1294                 return;
1295         }
1296
1297         # TODO(sesse): Maybe we can get the number of moves somehow else for FICS games.
1298         # The history is needed for id_for_pos.
1299         if (!exists($pos->{'history'})) {
1300                 return;
1301         }
1302
1303         my $id = id_for_pos($pos);
1304         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, $id);
1305         if (defined($clock_info)) {
1306                 $pos->{'white_clock'} //= $clock_info->{'white_clock'};
1307                 $pos->{'black_clock'} //= $clock_info->{'black_clock'};
1308                 if ($pos->{'toplay'} eq 'W') {
1309                         $pos->{'white_clock_target'} = $clock_info->{'white_clock_target'};
1310                 } else {
1311                         $pos->{'black_clock_target'} = $clock_info->{'black_clock_target'};
1312                 }
1313                 return;
1314         }
1315
1316         # OK, we haven't seen this position before, so we assume the move
1317         # happened right now.
1318
1319         # See if we should do our own clock management (ie., clock information
1320         # is spurious or non-existent).
1321         if (defined($remoteglotconf::adjust_clocks_before_move)) {
1322                 my $wc = $pos->{'white_clock'} // $prev_pos->{'white_clock'};
1323                 my $bc = $pos->{'black_clock'} // $prev_pos->{'black_clock'};
1324                 if (defined($prev_pos->{'white_clock_target'})) {
1325                         $wc = $prev_pos->{'white_clock_target'} - time;
1326                 }
1327                 if (defined($prev_pos->{'black_clock_target'})) {
1328                         $bc = $prev_pos->{'black_clock_target'} - time;
1329                 }
1330                 &$remoteglotconf::adjust_clocks_before_move(\$wc, \$bc, $pos->{'move_num'}, $pos->{'toplay'});
1331                 $pos->{'white_clock'} = $wc;
1332                 $pos->{'black_clock'} = $bc;
1333         }
1334
1335         my $key = ($pos->{'toplay'} eq 'W') ? 'white_clock' : 'black_clock';
1336         if (!exists($pos->{$key})) {
1337                 # No clock information.
1338                 return;
1339         }
1340         my $time_left = $pos->{$key};
1341         my ($white_clock_target, $black_clock_target);
1342         if ($pos->{'toplay'} eq 'W') {
1343                 $white_clock_target = $pos->{'white_clock_target'} = time + $time_left;
1344         } else {
1345                 $black_clock_target = $pos->{'black_clock_target'} = time + $time_left;
1346         }
1347         local $dbh->{AutoCommit} = 0;
1348         $dbh->do('DELETE FROM clock_info WHERE id=?', undef, $id);
1349         $dbh->do('INSERT INTO clock_info (id, white_clock, black_clock, white_clock_target, black_clock_target) VALUES (?, ?, ?, ?, ?)', undef,
1350                 $id, $pos->{'white_clock'}, $pos->{'black_clock'}, $white_clock_target, $black_clock_target);
1351         $dbh->commit;
1352 }
1353
1354 sub schedule_tb_lookup {
1355         return if (!defined($remoteglotconf::tb_serial_key));
1356         my $pos = $pos_calculating;
1357         return if (exists($tb_cache{$pos->fen()}));
1358
1359         # If there's more than seven pieces, there's not going to be an answer,
1360         # so don't bother.
1361         return if ($pos->num_pieces() > 7);
1362
1363         # Max one at a time. If it's still relevant when it returns,
1364         # schedule_tb_lookup() will be called again.
1365         return if ($tb_lookup_running);
1366
1367         $tb_lookup_running = 1;
1368         my $url = 'http://tb7-api.chessok.com:6904/tasks/addtask?auth.login=' .
1369                 $remoteglotconf::tb_serial_key .
1370                 '&auth.password=aquarium&type=0&fen=' .
1371                 URI::Escape::uri_escape($pos->fen());
1372         print TBLOG "Downloading $url...\n";
1373         AnyEvent::HTTP::http_get($url, sub {
1374                 handle_tb_lookup_return(@_, $pos, $pos->fen());
1375         });
1376 }
1377
1378 sub handle_tb_lookup_return {
1379         my ($body, $header, $pos, $fen) = @_;
1380         print TBLOG "Response for [$fen]:\n";
1381         print TBLOG $header . "\n\n";
1382         print TBLOG $body . "\n\n";
1383         eval {
1384                 my $response = JSON::XS::decode_json($body);
1385                 if ($response->{'ErrorCode'} != 0) {
1386                         die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
1387                 }
1388                 my $state = $response->{'Response'}{'StateString'};
1389                 if ($state eq 'COMPLETE') {
1390                         my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
1391                         if (!defined($pgn) || !$pgn->read_game()) {
1392                                 warn "Error in parsing PGN\n";
1393                         } else {
1394                                 $pgn->quick_parse_game;
1395                                 my $pvpos = $pos;
1396                                 my $moves = $pgn->moves;
1397                                 my @uci_moves = ();
1398                                 for my $move (@$moves) {
1399                                         my $uci_move;
1400                                         ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
1401                                         push @uci_moves, $uci_move;
1402                                 }
1403                                 $tb_cache{$fen} = {
1404                                         result => $pgn->result,
1405                                         pv => \@uci_moves,
1406                                         score => $response->{'Response'}{'Score'},
1407                                 };
1408                                 output();
1409                         }
1410                 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
1411                         # Try again in a second. Note that if we have changed
1412                         # position in the meantime, we might query a completely
1413                         # different position! But that's fine.
1414                 } else {
1415                         die "Unknown response state " . $state;
1416                 }
1417
1418                 # Wait a second before we schedule another one.
1419                 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
1420                         $tb_lookup_running = 0;
1421                         schedule_tb_lookup();
1422                 });
1423         };
1424         if ($@) {
1425                 warn "Error in tablebase lookup: $@";
1426
1427                 # Don't try this one again, but don't block new lookups either.
1428                 $tb_lookup_running = 0;
1429         }
1430 }
1431
1432 sub open_engine {
1433         my ($cmdline, $tag, $cb) = @_;
1434         return undef if (!defined($cmdline));
1435         return Engine->open($cmdline, $tag, $cb);
1436 }
1437
1438 sub col_letter_to_num {
1439         return ord(shift) - ord('a');
1440 }
1441
1442 sub row_letter_to_num {
1443         return 7 - (ord(shift) - ord('1'));
1444 }
1445
1446 sub parse_uci_move {
1447         my $move = shift;
1448         my $from_col = col_letter_to_num(substr($move, 0, 1));
1449         my $from_row = row_letter_to_num(substr($move, 1, 1));
1450         my $to_col   = col_letter_to_num(substr($move, 2, 1));
1451         my $to_row   = row_letter_to_num(substr($move, 3, 1));
1452         my $promo    = substr($move, 4, 1);
1453         return ($from_row, $from_col, $to_row, $to_col, $promo);
1454 }