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 0027;  # 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_waiting, $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'} <= $line\n";
 147         if ($line =~ /^info/) {
 148                 my (@infos) = split / /, $line;
 149                 shift @infos;
 150
 151                 parse_infos($engine, @infos);
 152         }
 153         if ($line =~ /^id/) {
 154                 my (@ids) = split / /, $line;
 155                 shift @ids;
 156
 157                 parse_ids($engine, @ids);
 158         }
 159         if ($line =~ /^bestmove/) {
 160                 if ($primary) {
 161                         return if (!$remoteglotconf::uci_assume_full_compliance);
 162                         if (defined($pos_waiting)) {
 163                                 uciprint($engine, "position fen " . $pos_waiting->fen());
 164                                 uciprint($engine, "go infinite");
 165
 166                                 $pos_calculating = $pos_waiting;
 167                                 $pos_waiting = undef;
 168                         }
 169                 } else {
 170                         $engine2->{'info'} = {};
 171                         my $pos = $pos_waiting // $pos_calculating;
 172                         uciprint($engine2, "position fen " . $pos->fen());
 173                         uciprint($engine2, "go infinite");
 174                         $pos_calculating_second_engine = $pos;
 175                 }
 176         }
 177         output();
 178 }
 179
 180 my $getting_movelist = 0;
 181 my $pos_for_movelist = undef;
 182 my @uci_movelist = ();
 183 my @pretty_movelist = ();
 184
 185 sub handle_fics {
 186         my $line = shift;
 187         if ($line =~ /^<12> /) {
 188                 handle_position(Position->new($line));
 189                 $t->cmd("moves");
 190         }
 191         if ($line =~ /^Movelist for game /) {
 192                 my $pos = $pos_waiting // $pos_calculating;
 193                 if (defined($pos)) {
 194                         @uci_movelist = ();
 195                         @pretty_movelist = ();
 196                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 197                         $getting_movelist = 1;
 198                 }
 199         }
 200         if ($getting_movelist &&
 201             $line =~ /^\s* \d+\. \s+                     # move number
 202                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 203                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 204                      /x) {
 205                 eval {
 206                         my $uci_move;
 207                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 208                         push @uci_movelist, $uci_move;
 209                         push @pretty_movelist, $1;
 210
 211                         if (defined($2)) {
 212                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 213                                 push @uci_movelist, $uci_move;
 214                                 push @pretty_movelist, $2;
 215                         }
 216                 };
 217                 if ($@) {
 218                         warn "Error when getting FICS move history: $@";
 219                         $getting_movelist = 0;
 220                 }
 221         }
 222         if ($getting_movelist &&
 223             $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
 224                 # End of movelist.
 225                 for my $pos ($pos_waiting, $pos_calculating) {
 226                         next if (!defined($pos));
 227                         if ($pos->fen() eq $pos_for_movelist->fen()) {
 228                                 $pos->{'history'} = \@pretty_movelist;
 229                         }
 230                 }
 231                 $getting_movelist = 0;
 232         }
 233         if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 234                 my ($who, $msg) = ($1, $2);
 235
 236                 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
 237
 238                 if ($msg =~ /^fics (.*?)$/) {
 239                         $t->cmd("tell $who Executing '$1' on FICS.");
 240                         $t->cmd($1);
 241                 } elsif ($msg =~ /^uci (.*?)$/) {
 242                         $t->cmd("tell $who Sending '$1' to the engine.");
 243                         print { $engine->{'write'} } "$1\n";
 244                 } elsif ($msg =~ /^pgn (.*?)$/) {
 245                         my $url = $1;
 246                         $t->cmd("tell $who Starting to poll '$url'.");
 247                         fetch_pgn($url);
 248                 } elsif ($msg =~ /^stoppgn$/) {
 249                         $t->cmd("tell $who Stopping poll.");
 250                         $stop_pgn_fetch = 1;
 251                         $http_timer = undef;
 252                 } elsif ($msg =~ /^quit$/) {
 253                         $t->cmd("tell $who Bye bye.");
 254                         exit;
 255                 } else {
 256                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 257                 }
 258         }
 259         #print "FICS: [$line]\n";
 260 }
 261
 262 # Starts periodic fetching of PGNs from the given URL.
 263 sub fetch_pgn {
 264         my ($url) = @_;
 265         AnyEvent::HTTP::http_get($url, sub {
 266                 handle_pgn(@_, $url);
 267         });
 268 }
 269
 270 my ($last_pgn_white, $last_pgn_black);
 271 my @last_pgn_uci_moves = ();
 272 my $pgn_hysteresis_counter = 0;
 273
 274 sub handle_pgn {
 275         my ($body, $header, $url) = @_;
 276
 277         if ($stop_pgn_fetch) {
 278                 $stop_pgn_fetch = 0;
 279                 $http_timer = undef;
 280                 return;
 281         }
 282
 283         my $pgn = Chess::PGN::Parse->new(undef, $body);
 284         if (!defined($pgn)) {
 285                 warn "Error in parsing PGN from $url [body='$body']\n";
 286         } elsif (!$pgn->read_game()) {
 287                 warn "Error in reading PGN game from $url [body='$body']\n";
 288         } elsif ($body !~ /^\[/) {
 289                 warn "Malformed PGN from $url [body='$body']\n";
 290         } else {
 291                 eval {
 292                         # Skip to the right game.
 293                         while (defined($remoteglotconf::pgn_filter) &&
 294                                !&$remoteglotconf::pgn_filter($pgn)) {
 295                                 $pgn->read_game() or die "Out of games during filtering";
 296                         }
 297
 298                         $pgn->parse_game({ save_comments => 'yes' });
 299                         my $white = $pgn->white;
 300                         my $black = $pgn->black;
 301                         $white =~ s/,.*//;  # Remove first name.
 302                         $black =~ s/,.*//;  # Remove first name.
 303                         my $pos = Position->start_pos($white, $black);
 304                         my $moves = $pgn->moves;
 305                         my @uci_moves = ();
 306                         my @repretty_moves = ();
 307                         for my $move (@$moves) {
 308                                 my ($npos, $uci_move) = $pos->make_pretty_move($move);
 309                                 push @uci_moves, $uci_move;
 310
 311                                 # Re-prettyprint the move.
 312                                 my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($uci_move);
 313                                 my ($pretty, undef) = $pos->{'board'}->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 314                                 push @repretty_moves, $pretty;
 315                                 $pos = $npos;
 316                         }
 317                         if ($pgn->result eq '1-0' || $pgn->result eq '1/2-1/2' || $pgn->result eq '0-1') {
 318                                 $pos->{'result'} = $pgn->result;
 319                         }
 320                         $pos->{'history'} = \@repretty_moves;
 321
 322                         extract_clock($pgn, $pos);
 323
 324                         # Sometimes, PGNs lose a move or two for a short while,
 325                         # or people push out new ones non-atomically.
 326                         # Thus, if we PGN doesn't change names but becomes
 327                         # shorter, we mistrust it for a few seconds.
 328                         my $trust_pgn = 1;
 329                         if (defined($last_pgn_white) && defined($last_pgn_black) &&
 330                             $last_pgn_white eq $pgn->white &&
 331                             $last_pgn_black eq $pgn->black &&
 332                             scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 333                                 if (++$pgn_hysteresis_counter < 3) {
 334                                         $trust_pgn = 0;
 335                                 }
 336                         }
 337                         if ($trust_pgn) {
 338                                 $last_pgn_white = $pgn->white;
 339                                 $last_pgn_black = $pgn->black;
 340                                 @last_pgn_uci_moves = @uci_moves;
 341                                 $pgn_hysteresis_counter = 0;
 342                                 handle_position($pos);
 343                         }
 344                 };
 345                 if ($@) {
 346                         warn "Error in parsing moves from $url: $@\n";
 347                 }
 348         }
 349
 350         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 351                 fetch_pgn($url);
 352         });
 353 }
 354
 355 sub handle_position {
 356         my ($pos) = @_;
 357         find_clock_start($pos, $pos_calculating);
 358
 359         # if this is already in the queue, ignore it (just update the result)
 360         if (defined($pos_waiting) && $pos->fen() eq $pos_waiting->fen()) {
 361                 $pos_waiting->{'result'} = $pos->{'result'};
 362                 return;
 363         }
 364
 365         # if we're already chewing on this and there's nothing else in the queue,
 366         # also ignore it
 367         if (!defined($pos_waiting) && defined($pos_calculating) &&
 368             $pos->fen() eq $pos_calculating->fen()) {
 369                 $pos_calculating->{'result'} = $pos->{'result'};
 370                 return;
 371         }
 372
 373         # if we're already thinking on something, stop and wait for the engine
 374         # to approve
 375         if (defined($pos_calculating)) {
 376                 # Store the final data we have for this position in the history,
 377                 # with the precise clock information we just got from the new
 378                 # position. (Historic positions store the clock at the end of
 379                 # the position.)
 380                 #
 381                 # Do not output anything new to the main analysis; that's
 382                 # going to be obsolete really soon.
 383                 $pos_calculating->{'white_clock'} = $pos->{'white_clock'};
 384                 $pos_calculating->{'black_clock'} = $pos->{'black_clock'};
 385                 delete $pos_calculating->{'white_clock_target'};
 386                 delete $pos_calculating->{'black_clock_target'};
 387                 output_json(1);
 388
 389                 if (!defined($pos_waiting)) {
 390                         uciprint($engine, "stop");
 391                 }
 392                 if ($remoteglotconf::uci_assume_full_compliance) {
 393                         $pos_waiting = $pos;
 394                 } else {
 395                         uciprint($engine, "position fen " . $pos->fen());
 396                         uciprint($engine, "go infinite");
 397                         $pos_calculating = $pos;
 398                 }
 399         } else {
 400                 # it's wrong just to give the FEN (the move history is useful,
 401                 # and per the UCI spec, we should really have sent "ucinewgame"),
 402                 # but it's easier
 403                 uciprint($engine, "position fen " . $pos->fen());
 404                 uciprint($engine, "go infinite");
 405                 $pos_calculating = $pos;
 406         }
 407
 408         if (defined($engine2)) {
 409                 if (defined($pos_calculating_second_engine)) {
 410                         uciprint($engine2, "stop");
 411                 } else {
 412                         uciprint($engine2, "position fen " . $pos->fen());
 413                         uciprint($engine2, "go infinite");
 414                         $pos_calculating_second_engine = $pos;
 415                 }
 416                 $engine2->{'info'} = {};
 417         }
 418
 419         $engine->{'info'} = {};
 420         $last_move = time;
 421
 422         schedule_tb_lookup();
 423
 424         #
 425         # Output a command every move to note that we're
 426         # still paying attention -- this is a good tradeoff,
 427         # since if no move has happened in the last half
 428         # hour, the analysis/relay has most likely stopped
 429         # and we should stop hogging server resources.
 430         #
 431         if (defined($t)) {
 432                 $t->cmd("date");
 433         }
 434 }
 435
 436 sub parse_infos {
 437         my ($engine, @x) = @_;
 438         my $mpv = '';
 439
 440         my $info = $engine->{'info'};
 441
 442         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 443         for my $i (0..$#x - 1) {
 444                 if ($x[$i] eq 'multipv') {
 445                         $mpv = $x[$i + 1];
 446                         next;
 447                 }
 448         }
 449
 450         while (scalar @x > 0) {
 451                 if ($x[0] eq 'multipv') {
 452                         # Dealt with above
 453                         shift @x;
 454                         shift @x;
 455                         next;
 456                 }
 457                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 458                         my $key = shift @x;
 459                         my $value = shift @x;
 460                         $info->{$key} = $value;
 461                         next;
 462                 }
 463                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 464                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 465                     $x[0] eq 'tbhits') {
 466                         my $key = shift @x;
 467                         my $value = shift @x;
 468                         $info->{$key . $mpv} = $value;
 469                         next;
 470                 }
 471                 if ($x[0] eq 'score') {
 472                         shift @x;
 473
 474                         delete $info->{'score_cp' . $mpv};
 475                         delete $info->{'score_mate' . $mpv};
 476
 477                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 478                                 if ($x[0] eq 'cp') {
 479                                         shift @x;
 480                                         $info->{'score_cp' . $mpv} = shift @x;
 481                                 } elsif ($x[0] eq 'mate') {
 482                                         shift @x;
 483                                         $info->{'score_mate' . $mpv} = shift @x;
 484                                 } else {
 485                                         shift @x;
 486                                 }
 487                         }
 488                         next;
 489                 }
 490                 if ($x[0] eq 'pv') {
 491                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 492                         last;
 493                 }
 494                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 495                         last;
 496                 }
 497
 498                 #print "unknown info '$x[0]', trying to recover...\n";
 499                 #shift @x;
 500                 die "Unknown info '" . join(',', @x) . "'";
 501
 502         }
 503 }
 504
 505 sub parse_ids {
 506         my ($engine, @x) = @_;
 507
 508         while (scalar @x > 0) {
 509                 if ($x[0] eq 'name') {
 510                         my $value = join(' ', @x);
 511                         $engine->{'id'}{'author'} = $value;
 512                         last;
 513                 }
 514
 515                 # unknown
 516                 shift @x;
 517         }
 518 }
 519
 520 sub prettyprint_pv_no_cache {
 521         my ($board, @pvs) = @_;
 522
 523         if (scalar @pvs == 0 || !defined($pvs[0])) {
 524                 return ();
 525         }
 526
 527         my $pv = shift @pvs;
 528         my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($pv);
 529         my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 530         return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
 531 }
 532
 533 sub prettyprint_pv {
 534         my ($pos, @pvs) = @_;
 535
 536         my $cachekey = $pos->{'fen'} . join('', @pvs);
 537         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 538                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 539         } else {
 540                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 541                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 542                 return @res;
 543         }
 544 }
 545
 546 my %tbprobe_cache = ();
 547
 548 sub complete_using_tbprobe {
 549         my ($pos, $info, $mpv) = @_;
 550
 551         # We need Fathom installed to do standalone TB probes.
 552         return if (!defined($remoteglotconf::fathom_cmdline));
 553
 554         # If we already have a mate, don't bother; in some cases, it would even be
 555         # better than a tablebase score.
 556         return if defined($info->{'score_mate' . $mpv});
 557
 558         # If we have a draw or near-draw score, there's also not much interesting
 559         # we could add from a tablebase. We only really want mates.
 560         return if ($info->{'score_cp' . $mpv} >= -12250 && $info->{'score_cp' . $mpv} <= 12250);
 561
 562         # Run through the PV until we are at a 6-man position.
 563         # TODO: We could in theory only have 5-man data.
 564         my @pv = @{$info->{'pv' . $mpv}};
 565         my $key = $pos->fen() . " " . join('', @pv);
 566         my @moves = ();
 567         if (exists($tbprobe_cache{$key})) {
 568                 @moves = @{$tbprobe_cache{$key}};
 569         } else {
 570                 if ($mpv ne '') {
 571                         # Force doing at least one move of the PV.
 572                         my $move = shift @pv;
 573                         push @moves, $move;
 574                         $pos = $pos->make_move(parse_uci_move($move));
 575                 }
 576
 577                 while ($pos->num_pieces() > 6 && $#pv > -1) {
 578                         my $move = shift @pv;
 579                         push @moves, $move;
 580                         $pos = $pos->make_move(parse_uci_move($move));
 581                 }
 582
 583                 return if ($pos->num_pieces() > 6);
 584
 585                 my $fen = $pos->fen();
 586                 my $pgn_text = `fathom --path=/srv/syzygy "$fen"`;
 587                 my $pgn = Chess::PGN::Parse->new(undef, $pgn_text);
 588                 return if (!defined($pgn) || !$pgn->read_game() || ($pgn->result ne '0-1' && $pgn->result ne '1-0'));
 589                 $pgn->quick_parse_game;
 590                 $info->{'pv' . $mpv} = \@moves;
 591
 592                 # Splice the PV from the tablebase onto what we have so far.
 593                 for my $move (@{$pgn->moves}) {
 594                         my $uci_move;
 595                         ($pos, $uci_move) = $pos->make_pretty_move($move);
 596                         push @moves, $uci_move;
 597                 }
 598
 599                 $tbprobe_cache{$key} = \@moves;
 600         }
 601
 602         $info->{'pv' . $mpv} = \@moves;
 603
 604         my $matelen = int((1 + scalar @moves) / 2);
 605         if ((scalar @moves) % 2 == 0) {
 606                 $info->{'score_mate' . $mpv} = -$matelen;
 607         } else {
 608                 $info->{'score_mate' . $mpv} = $matelen;
 609         }
 610 }
 611
 612 sub output {
 613         #return;
 614
 615         return if (!defined($pos_calculating));
 616
 617         # Don't update too often.
 618         my $age = Time::HiRes::tv_interval($latest_update);
 619         if ($age < $remoteglotconf::update_max_interval) {
 620                 my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
 621                 $output_timer = AnyEvent->timer(after => $wait, cb => \&output);
 622                 return;
 623         }
 624
 625         my $info = $engine->{'info'};
 626
 627         #
 628         # If we have tablebase data from a previous lookup, replace the
 629         # engine data with the data from the tablebase.
 630         #
 631         my $fen = $pos_calculating->fen();
 632         if (exists($tb_cache{$fen})) {
 633                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 634                         delete $info->{$key . '1'};
 635                         delete $info->{$key};
 636                 }
 637                 $info->{'nodes'} = 0;
 638                 $info->{'nps'} = 0;
 639                 $info->{'depth'} = 0;
 640                 $info->{'seldepth'} = 0;
 641                 $info->{'tbhits'} = 0;
 642
 643                 my $t = $tb_cache{$fen};
 644                 my $pv = $t->{'pv'};
 645                 my $matelen = int((1 + $t->{'score'}) / 2);
 646                 if ($t->{'result'} eq '1/2-1/2') {
 647                         $info->{'score_cp'} = 0;
 648                 } elsif ($t->{'result'} eq '1-0') {
 649                         if ($pos_calculating->{'toplay'} eq 'B') {
 650                                 $info->{'score_mate'} = -$matelen;
 651                         } else {
 652                                 $info->{'score_mate'} = $matelen;
 653                         }
 654                 } else {
 655                         if ($pos_calculating->{'toplay'} eq 'B') {
 656                                 $info->{'score_mate'} = $matelen;
 657                         } else {
 658                                 $info->{'score_mate'} = -$matelen;
 659                         }
 660                 }
 661                 $info->{'pv'} = $pv;
 662                 $info->{'tablebase'} = 1;
 663         } else {
 664                 $info->{'tablebase'} = 0;
 665         }
 666
 667         #
 668         # Some programs _always_ report MultiPV, even with only one PV.
 669         # In this case, we simply use that data as if MultiPV was never
 670         # specified.
 671         #
 672         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 673                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 674                         if (exists($info->{$key . '1'})) {
 675                                 $info->{$key} = $info->{$key . '1'};
 676                         } else {
 677                                 delete $info->{$key};
 678                         }
 679                 }
 680         }
 681
 682         #
 683         # Check the PVs first. if they're invalid, just wait, as our data
 684         # is most likely out of sync. This isn't a very good solution, as
 685         # it can frequently miss stuff, but it's good enough for most users.
 686         #
 687         eval {
 688                 my $dummy;
 689                 if (exists($info->{'pv'})) {
 690                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 691                 }
 692
 693                 my $mpv = 1;
 694                 while (exists($info->{'pv' . $mpv})) {
 695                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 696                         ++$mpv;
 697                 }
 698         };
 699         if ($@) {
 700                 $engine->{'info'} = {};
 701                 return;
 702         }
 703
 704         # Now do our own Syzygy tablebase probes to convert scores like +123.45 to mate.
 705         if (exists($info->{'pv'})) {
 706                 complete_using_tbprobe($pos_calculating, $info, '');
 707         }
 708
 709         my $mpv = 1;
 710         while (exists($info->{'pv' . $mpv})) {
 711                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 712                 ++$mpv;
 713         }
 714
 715         output_screen();
 716         output_json(0);
 717         $latest_update = [Time::HiRes::gettimeofday];
 718 }
 719
 720 sub output_screen {
 721         my $info = $engine->{'info'};
 722         my $id = $engine->{'id'};
 723
 724         my $text = 'Analysis';
 725         if ($pos_calculating->{'last_move'} ne 'none') {
 726                 if ($pos_calculating->{'toplay'} eq 'W') {
 727                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 728                 } else {
 729                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 730                 }
 731                 if (exists($id->{'name'})) {
 732                         $text .= ',';
 733                 }
 734         }
 735
 736         if (exists($id->{'name'})) {
 737                 $text .= " by $id->{'name'}:\n\n";
 738         } else {
 739                 $text .= ":\n\n";
 740         }
 741
 742         return unless (exists($pos_calculating->{'board'}));
 743
 744         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 745                 # multi-PV
 746                 my $mpv = 1;
 747                 while (exists($info->{'pv' . $mpv})) {
 748                         $text .= sprintf "  PV%2u", $mpv;
 749                         my $score = short_score($info, $pos_calculating, $mpv);
 750                         $text .= "  ($score)" if (defined($score));
 751
 752                         my $tbhits = '';
 753                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 754                                 if ($info->{'tbhits' . $mpv} == 1) {
 755                                         $tbhits = ", 1 tbhit";
 756                                 } else {
 757                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 758                                 }
 759                         }
 760
 761                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 762                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 763                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 764                         }
 765
 766                         $text .= ":\n";
 767                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 768                         $text .= "\n";
 769                         ++$mpv;
 770                 }
 771         } else {
 772                 # single-PV
 773                 my $score = long_score($info, $pos_calculating, '');
 774                 $text .= "  $score\n" if defined($score);
 775                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 776                 $text .=  "\n";
 777
 778                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 779                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 780                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 781                 }
 782                 if (exists($info->{'seldepth'})) {
 783                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 784                 }
 785                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 786                         if ($info->{'tbhits'} == 1) {
 787                                 $text .= ", one Syzygy hit";
 788                         } else {
 789                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 790                         }
 791                 }
 792                 $text .= "\n\n";
 793         }
 794
 795         #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
 796
 797         my @refutation_lines = ();
 798         if (defined($engine2)) {
 799                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 800                         my $info = $engine2->{'info'};
 801                         last if (!exists($info->{'pv' . $mpv}));
 802                         eval {
 803                                 complete_using_tbprobe($pos_calculating_second_engine, $info, $mpv);
 804                                 my $pv = $info->{'pv' . $mpv};
 805                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 806                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 807                                 if (scalar @pretty_pv > 5) {
 808                                         @pretty_pv = @pretty_pv[0..4];
 809                                         push @pretty_pv, "...";
 810                                 }
 811                                 my $key = $pretty_move;
 812                                 my $line = sprintf("  %-6s %6s %3s  %s",
 813                                         $pretty_move,
 814                                         short_score($info, $pos_calculating_second_engine, $mpv),
 815                                         "d" . $info->{'depth' . $mpv},
 816                                         join(', ', @pretty_pv));
 817                                 push @refutation_lines, [ $key, $line ];
 818                         };
 819                 }
 820         }
 821
 822         if ($#refutation_lines >= 0) {
 823                 $text .= "Shallow search of all legal moves:\n\n";
 824                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 825                         $text .= $line->[1] . "\n";
 826                 }
 827                 $text .= "\n\n";
 828         }
 829
 830         if ($last_text ne $text) {
 831                 print "\e[H\e[2J"; # clear the screen
 832                 print $text;
 833                 $last_text = $text;
 834         }
 835 }
 836
 837 sub output_json {
 838         my $historic_json_only = shift;
 839         my $info = $engine->{'info'};
 840
 841         my $json = {};
 842         $json->{'position'} = $pos_calculating->to_json_hash();
 843         $json->{'engine'} = $engine->{'id'};
 844         if (defined($remoteglotconf::engine_url)) {
 845                 $json->{'engine'}{'url'} = $remoteglotconf::engine_url;
 846         }
 847         if (defined($remoteglotconf::engine_details)) {
 848                 $json->{'engine'}{'details'} = $remoteglotconf::engine_details;
 849         }
 850         my @grpc_backends = ();
 851         if (defined($remoteglotconf::engine_grpc_backend)) {
 852                 push @grpc_backends, $remoteglotconf::engine_grpc_backend;
 853         }
 854         if (defined($remoteglotconf::engine2_grpc_backend)) {
 855                 push @grpc_backends, $remoteglotconf::engine2_grpc_backend;
 856         }
 857         $json->{'internal'}{'grpc_backends'} = \@grpc_backends;
 858         if (defined($remoteglotconf::move_source)) {
 859                 $json->{'move_source'} = $remoteglotconf::move_source;
 860         }
 861         if (defined($remoteglotconf::move_source_url)) {
 862                 $json->{'move_source_url'} = $remoteglotconf::move_source_url;
 863         }
 864         $json->{'score'} = score_digest($info, $pos_calculating, '');
 865         $json->{'using_lomonosov'} = defined($remoteglotconf::tb_serial_key);
 866
 867         $json->{'nodes'} = $info->{'nodes'};
 868         $json->{'nps'} = $info->{'nps'};
 869         $json->{'depth'} = $info->{'depth'};
 870         $json->{'tbhits'} = $info->{'tbhits'};
 871         $json->{'seldepth'} = $info->{'seldepth'};
 872         $json->{'tablebase'} = $info->{'tablebase'};
 873         $json->{'pv'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 874
 875         my %refutation_lines = ();
 876         my @refutation_lines = ();
 877         if (defined($engine2)) {
 878                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 879                         my $info = $engine2->{'info'};
 880                         my $pretty_move = "";
 881                         my @pretty_pv = ();
 882                         last if (!exists($info->{'pv' . $mpv}));
 883
 884                         eval {
 885                                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 886                                 my $pv = $info->{'pv' . $mpv};
 887                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 888                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 889                                 $refutation_lines{$pretty_move} = {
 890                                         depth => $info->{'depth' . $mpv},
 891                                         score => score_digest($info, $pos_calculating, $mpv),
 892                                         move => $pretty_move,
 893                                         pv => \@pretty_pv,
 894                                 };
 895                         };
 896                 }
 897         }
 898         $json->{'refutation_lines'} = \%refutation_lines;
 899
 900         # Piece together historic score information, to the degree we have it.
 901         if (!$historic_json_only && exists($pos_calculating->{'history'})) {
 902                 my %score_history = ();
 903
 904                 my $q = $dbh->prepare('SELECT * FROM scores WHERE id=?');
 905                 my $pos = Position->start_pos('white', 'black');
 906                 my $halfmove_num = 0;
 907                 for my $move (@{$pos_calculating->{'history'}}) {
 908                         my $id = id_for_pos($pos, $halfmove_num);
 909                         my $ref = $dbh->selectrow_hashref($q, undef, $id);
 910                         if (defined($ref)) {
 911                                 $score_history{$halfmove_num} = [
 912                                         $ref->{'score_type'},
 913                                         $ref->{'score_value'}
 914                                 ];
 915                         }
 916                         ++$halfmove_num;
 917                         ($pos) = $pos->make_pretty_move($move);
 918                 }
 919                 $q->finish;
 920
 921                 # If at any point we are missing 10 consecutive moves,
 922                 # truncate the history there. This is so we don't get into
 923                 # a situation where we e.g. start analyzing at move 45,
 924                 # but we have analysis for 1. e4 from some completely different game
 925                 # and thus show a huge hole.
 926                 my $consecutive_missing = 0;
 927                 my $truncate_until = 0;
 928                 for (my $i = $halfmove_num; $i --> 0; ) {
 929                         if ($consecutive_missing >= 10) {
 930                                 delete $score_history{$i};
 931                                 next;
 932                         }
 933                         if (exists($score_history{$i})) {
 934                                 $consecutive_missing = 0;
 935                         } else {
 936                                 ++$consecutive_missing;
 937                         }
 938                 }
 939
 940                 $json->{'score_history'} = \%score_history;
 941         }
 942
 943         # Give out a list of other games going on. (Empty is fine.)
 944         # TODO: Don't bother reading our own file, the data will be stale anyway.
 945         if (!$historic_json_only) {
 946                 my @games = ();
 947
 948                 my $q = $dbh->prepare('SELECT * FROM current_games ORDER BY priority DESC, id');
 949                 $q->execute;
 950                 while (my $ref = $q->fetchrow_hashref) {
 951                         eval {
 952                                 my $other_game_contents = File::Slurp::read_file($ref->{'json_path'});
 953                                 my $other_game_json = JSON::XS::decode_json($other_game_contents);
 954
 955                                 die "Missing position" if (!exists($other_game_json->{'position'}));
 956                                 my $white = $other_game_json->{'position'}{'player_w'} // die 'Missing white';
 957                                 my $black = $other_game_json->{'position'}{'player_b'} // die 'Missing black';
 958
 959                                 my $game = {
 960                                         id => $ref->{'id'},
 961                                         name => "$white–$black",
 962                                         url => $ref->{'url'},
 963                                         hashurl => $ref->{'hash_url'},
 964                                 };
 965                                 if (defined($other_game_json->{'position'}{'result'})) {
 966                                         $game->{'result'} = $other_game_json->{'position'}{'result'};
 967                                 } else {
 968                                         $game->{'score'} = $other_game_json->{'score'};
 969                                 }
 970                                 push @games, $game;
 971                         };
 972                         if ($@) {
 973                                 warn "Could not add external game " . $ref->{'json_path'} . ": $@";
 974                         }
 975                 }
 976
 977                 if (scalar @games > 0) {
 978                         $json->{'games'} = \@games;
 979                 }
 980         }
 981
 982         my $json_enc = JSON::XS->new;
 983         $json_enc->canonical(1);
 984         my $encoded = $json_enc->encode($json);
 985         unless ($historic_json_only || !defined($remoteglotconf::json_output) ||
 986                 (defined($last_written_json) && $last_written_json eq $encoded)) {
 987                 atomic_set_contents($remoteglotconf::json_output, $encoded);
 988                 $last_written_json = $encoded;
 989         }
 990
 991         if (exists($pos_calculating->{'history'}) &&
 992             defined($remoteglotconf::json_history_dir)) {
 993                 my $id = id_for_pos($pos_calculating);
 994                 my $filename = $remoteglotconf::json_history_dir . "/" . $id . ".json";
 995
 996                 # Overwrite old analysis (assuming it exists at all) if we're
 997                 # using a different engine, or if we've calculated deeper.
 998                 # nodes is used as a tiebreaker. Don't bother about Multi-PV
 999                 # data; it's not that important.
1000                 my ($old_engine, $old_depth, $old_nodes) = get_json_analysis_stats($id);
1001                 my $new_depth = $json->{'depth'} // 0;
1002                 my $new_nodes = $json->{'nodes'} // 0;
1003                 if (!defined($old_engine) ||
1004                     $old_engine ne $json->{'engine'}{'name'} ||
1005                     $new_depth > $old_depth ||
1006                     ($new_depth == $old_depth && $new_nodes >= $old_nodes)) {
1007                         atomic_set_contents($filename, $encoded);
1008                         if (defined($json->{'score'})) {
1009                                 $dbh->do('INSERT INTO scores (id, score_type, score_value, engine, depth, nodes) VALUES (?,?,?,?,?,?) ' .
1010                                          '    ON CONFLICT (id) DO UPDATE SET ' .
1011                                          '        score_type=EXCLUDED.score_type, ' .
1012                                          '        score_value=EXCLUDED.score_value, ' .
1013                                          '        engine=EXCLUDED.engine, ' .
1014                                          '        depth=EXCLUDED.depth, ' .
1015                                          '        nodes=EXCLUDED.nodes',
1016                                         undef,
1017                                         $id, $json->{'score'}[0], $json->{'score'}[1],
1018                                         $json->{'engine'}{'name'}, $new_depth, $new_nodes);
1019                         }
1020                 }
1021         }
1022 }
1023
1024 sub atomic_set_contents {
1025         my ($filename, $contents) = @_;
1026
1027         open my $fh, ">", $filename . ".tmp"
1028                 or return;
1029         print $fh $contents;
1030         close $fh;
1031         rename($filename . ".tmp", $filename);
1032 }
1033
1034 sub id_for_pos {
1035         my ($pos, $halfmove_num) = @_;
1036
1037         $halfmove_num //= scalar @{$pos->{'history'}};
1038         (my $fen = $pos->fen()) =~ tr,/ ,-_,;
1039         return "move$halfmove_num-$fen";
1040 }
1041
1042 sub get_json_analysis_stats {
1043         my $id = shift;
1044         my $ref = $dbh->selectrow_hashref('SELECT * FROM scores WHERE id=?', undef, $id);
1045         if (defined($ref)) {
1046                 return ($ref->{'engine'}, $ref->{'depth'}, $ref->{'nodes'});
1047         } else {
1048                 return ('', 0, 0);
1049         }
1050 }
1051
1052 sub uciprint {
1053         my ($engine, $msg) = @_;
1054         $engine->print($msg);
1055         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
1056 }
1057
1058 sub short_score {
1059         my ($info, $pos, $mpv) = @_;
1060
1061         my $invert = ($pos->{'toplay'} eq 'B');
1062         if (defined($info->{'score_mate' . $mpv})) {
1063                 if ($invert) {
1064                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
1065                 } else {
1066                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
1067                 }
1068         } else {
1069                 if (exists($info->{'score_cp' . $mpv})) {
1070                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1071                         if ($score == 0) {
1072                                 if ($info->{'tablebase'}) {
1073                                         return "TB draw";
1074                                 } else {
1075                                         return " 0.00";
1076                                 }
1077                         }
1078                         if ($invert) {
1079                                 $score = -$score;
1080                         }
1081                         return sprintf "%+5.2f", $score;
1082                 }
1083         }
1084
1085         return undef;
1086 }
1087
1088 # Sufficient for computing long_score, short_score, plot_score and
1089 # (with side-to-play information) score_sort_key.
1090 sub score_digest {
1091         my ($info, $pos, $mpv) = @_;
1092
1093         if (defined($info->{'score_mate' . $mpv})) {
1094                 my $mate = $info->{'score_mate' . $mpv};
1095                 if ($pos->{'toplay'} eq 'B') {
1096                         $mate = -$mate;
1097                 }
1098                 return ['m', $mate];
1099         } else {
1100                 if (exists($info->{'score_cp' . $mpv})) {
1101                         my $score = $info->{'score_cp' . $mpv};
1102                         if ($pos->{'toplay'} eq 'B') {
1103                                 $score = -$score;
1104                         }
1105                         if ($score == 0 && $info->{'tablebase'}) {
1106                                 return ['d', undef];
1107                         } else {
1108                                 return ['cp', int($score)];
1109                         }
1110                 }
1111         }
1112
1113         return undef;
1114 }
1115
1116 sub long_score {
1117         my ($info, $pos, $mpv) = @_;
1118
1119         if (defined($info->{'score_mate' . $mpv})) {
1120                 my $mate = $info->{'score_mate' . $mpv};
1121                 if ($pos->{'toplay'} eq 'B') {
1122                         $mate = -$mate;
1123                 }
1124                 if ($mate > 0) {
1125                         return sprintf "White mates in %u", $mate;
1126                 } else {
1127                         return sprintf "Black mates in %u", -$mate;
1128                 }
1129         } else {
1130                 if (exists($info->{'score_cp' . $mpv})) {
1131                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1132                         if ($score == 0) {
1133                                 if ($info->{'tablebase'}) {
1134                                         return "Theoretical draw";
1135                                 } else {
1136                                         return "Score:  0.00";
1137                                 }
1138                         }
1139                         if ($pos->{'toplay'} eq 'B') {
1140                                 $score = -$score;
1141                         }
1142                         return sprintf "Score: %+5.2f", $score;
1143                 }
1144         }
1145
1146         return undef;
1147 }
1148
1149 # For graphs; a single number in centipawns, capped at +/- 500.
1150 sub plot_score {
1151         my ($info, $pos, $mpv) = @_;
1152
1153         my $invert = ($pos->{'toplay'} eq 'B');
1154         if (defined($info->{'score_mate' . $mpv})) {
1155                 my $mate = $info->{'score_mate' . $mpv};
1156                 if ($invert) {
1157                         $mate = -$mate;
1158                 }
1159                 if ($mate > 0) {
1160                         return 500;
1161                 } else {
1162                         return -500;
1163                 }
1164         } else {
1165                 if (exists($info->{'score_cp' . $mpv})) {
1166                         my $score = $info->{'score_cp' . $mpv};
1167                         if ($invert) {
1168                                 $score = -$score;
1169                         }
1170                         $score = 500 if ($score > 500);
1171                         $score = -500 if ($score < -500);
1172                         return int($score);
1173                 }
1174         }
1175
1176         return undef;
1177 }
1178
1179 my %book_cache = ();
1180 sub book_info {
1181         my ($fen, $board, $toplay) = @_;
1182
1183         if (exists($book_cache{$fen})) {
1184                 return $book_cache{$fen};
1185         }
1186
1187         my $ret = `./booklook $fen`;
1188         return "" if ($ret =~ /Not found/ || $ret eq '');
1189
1190         my @moves = ();
1191
1192         for my $m (split /\n/, $ret) {
1193                 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
1194
1195                 my $pmove;
1196                 if ($move eq '')  {
1197                         $pmove = '(current)';
1198                 } else {
1199                         ($pmove) = prettyprint_pv_no_cache($board, $move);
1200                         $pmove .= $annotation;
1201                 }
1202
1203                 my $score;
1204                 if ($toplay eq 'W') {
1205                         $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
1206                 } else {
1207                         $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
1208                 }
1209                 my $n = $win + $draw + $lose;
1210
1211                 my $percent;
1212                 if ($n == 0) {
1213                         $percent = "     ";
1214                 } else {
1215                         $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
1216                 }
1217
1218                 push @moves, [ $pmove, $n, $percent, $rating ];
1219         }
1220
1221         @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
1222
1223         my $text = "Book moves:\n\n              Perf.     N     Rating\n\n";
1224         for my $m (@moves) {
1225                 $text .= sprintf "  %-10s %s   %6u    %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
1226         }
1227
1228         return $text;
1229 }
1230
1231 sub extract_clock {
1232         my ($pgn, $pos) = @_;
1233
1234         # Look for extended PGN clock tags.
1235         my $tags = $pgn->tags;
1236         if (exists($tags->{'WhiteClock'}) && exists($tags->{'BlackClock'})) {
1237                 $pos->{'white_clock'} = hms_to_sec($tags->{'WhiteClock'});
1238                 $pos->{'black_clock'} = hms_to_sec($tags->{'BlackClock'});
1239                 return;
1240         }
1241
1242         # Look for TCEC-style time comments.
1243         my $moves = $pgn->moves;
1244         my $comments = $pgn->comments;
1245         my $last_black_move = int((scalar @$moves) / 2);
1246         my $last_white_move = int((1 + scalar @$moves) / 2);
1247
1248         my $black_key = $last_black_move . "b";
1249         my $white_key = $last_white_move . "w";
1250
1251         if (exists($comments->{$white_key}) &&
1252             exists($comments->{$black_key}) &&
1253             $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/ &&
1254             $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/) {
1255                 $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1256                 $pos->{'white_clock'} = hms_to_sec($1);
1257                 $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1258                 $pos->{'black_clock'} = hms_to_sec($1);
1259                 return;
1260         }
1261
1262         delete $pos->{'white_clock'};
1263         delete $pos->{'black_clock'};
1264 }
1265
1266 sub hms_to_sec {
1267         my $hms = shift;
1268         return undef if (!defined($hms));
1269         $hms =~ /(\d+):(\d+):(\d+)/;
1270         return $1 * 3600 + $2 * 60 + $3;
1271 }
1272
1273 sub find_clock_start {
1274         my ($pos, $prev_pos) = @_;
1275
1276         # If the game is over, the clock is stopped.
1277         if (exists($pos->{'result'}) &&
1278             ($pos->{'result'} eq '1-0' ||
1279              $pos->{'result'} eq '1/2-1/2' ||
1280              $pos->{'result'} eq '0-1')) {
1281                 return;
1282         }
1283
1284         # When we don't have any moves, we assume the clock hasn't started yet.
1285         if ($pos->{'move_num'} == 1 && $pos->{'toplay'} eq 'W') {
1286                 if (defined($remoteglotconf::adjust_clocks_before_move)) {
1287                         &$remoteglotconf::adjust_clocks_before_move(\$pos->{'white_clock'}, \$pos->{'black_clock'}, 1, 'W');
1288                 }
1289                 return;
1290         }
1291
1292         # TODO(sesse): Maybe we can get the number of moves somehow else for FICS games.
1293         # The history is needed for id_for_pos.
1294         if (!exists($pos->{'history'})) {
1295                 return;
1296         }
1297
1298         my $id = id_for_pos($pos);
1299         my $clock_info = $dbh->selectrow_hashref('SELECT * FROM clock_info WHERE id=?', undef, $id);
1300         if (defined($clock_info)) {
1301                 $pos->{'white_clock'} //= $clock_info->{'white_clock'};
1302                 $pos->{'black_clock'} //= $clock_info->{'black_clock'};
1303                 if ($pos->{'toplay'} eq 'W') {
1304                         $pos->{'white_clock_target'} = $clock_info->{'white_clock_target'};
1305                 } else {
1306                         $pos->{'black_clock_target'} = $clock_info->{'black_clock_target'};
1307                 }
1308                 return;
1309         }
1310
1311         # OK, we haven't seen this position before, so we assume the move
1312         # happened right now.
1313
1314         # See if we should do our own clock management (ie., clock information
1315         # is spurious or non-existent).
1316         if (defined($remoteglotconf::adjust_clocks_before_move)) {
1317                 my $wc = $pos->{'white_clock'} // $prev_pos->{'white_clock'};
1318                 my $bc = $pos->{'black_clock'} // $prev_pos->{'black_clock'};
1319                 if (defined($prev_pos->{'white_clock_target'})) {
1320                         $wc = $prev_pos->{'white_clock_target'} - time;
1321                 }
1322                 if (defined($prev_pos->{'black_clock_target'})) {
1323                         $bc = $prev_pos->{'black_clock_target'} - time;
1324                 }
1325                 &$remoteglotconf::adjust_clocks_before_move(\$wc, \$bc, $pos->{'move_num'}, $pos->{'toplay'});
1326                 $pos->{'white_clock'} = $wc;
1327                 $pos->{'black_clock'} = $bc;
1328         }
1329
1330         my $key = ($pos->{'toplay'} eq 'W') ? 'white_clock' : 'black_clock';
1331         if (!exists($pos->{$key})) {
1332                 # No clock information.
1333                 return;
1334         }
1335         my $time_left = $pos->{$key};
1336         my ($white_clock_target, $black_clock_target);
1337         if ($pos->{'toplay'} eq 'W') {
1338                 $white_clock_target = $pos->{'white_clock_target'} = time + $time_left;
1339         } else {
1340                 $black_clock_target = $pos->{'black_clock_target'} = time + $time_left;
1341         }
1342         local $dbh->{AutoCommit} = 0;
1343         $dbh->do('DELETE FROM clock_info WHERE id=?', undef, $id);
1344         $dbh->do('INSERT INTO clock_info (id, white_clock, black_clock, white_clock_target, black_clock_target) VALUES (?, ?, ?, ?, ?)', undef,
1345                 $id, $pos->{'white_clock'}, $pos->{'black_clock'}, $white_clock_target, $black_clock_target);
1346         $dbh->commit;
1347 }
1348
1349 sub schedule_tb_lookup {
1350         return if (!defined($remoteglotconf::tb_serial_key));
1351         my $pos = $pos_waiting // $pos_calculating;
1352         return if (exists($tb_cache{$pos->fen()}));
1353
1354         # If there's more than seven pieces, there's not going to be an answer,
1355         # so don't bother.
1356         return if ($pos->num_pieces() > 7);
1357
1358         # Max one at a time. If it's still relevant when it returns,
1359         # schedule_tb_lookup() will be called again.
1360         return if ($tb_lookup_running);
1361
1362         $tb_lookup_running = 1;
1363         my $url = 'http://158.250.18.203:6904/tasks/addtask?auth.login=' .
1364                 $remoteglotconf::tb_serial_key .
1365                 '&auth.password=aquarium&type=0&fen=' .
1366                 URI::Escape::uri_escape($pos->fen());
1367         print TBLOG "Downloading $url...\n";
1368         AnyEvent::HTTP::http_get($url, sub {
1369                 handle_tb_lookup_return(@_, $pos, $pos->fen());
1370         });
1371 }
1372
1373 sub handle_tb_lookup_return {
1374         my ($body, $header, $pos, $fen) = @_;
1375         print TBLOG "Response for [$fen]:\n";
1376         print TBLOG $header . "\n\n";
1377         print TBLOG $body . "\n\n";
1378         eval {
1379                 my $response = JSON::XS::decode_json($body);
1380                 if ($response->{'ErrorCode'} != 0) {
1381                         die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
1382                 }
1383                 my $state = $response->{'Response'}{'StateString'};
1384                 if ($state eq 'COMPLETE') {
1385                         my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
1386                         if (!defined($pgn) || !$pgn->read_game()) {
1387                                 warn "Error in parsing PGN\n";
1388                         } else {
1389                                 $pgn->quick_parse_game;
1390                                 my $pvpos = $pos;
1391                                 my $moves = $pgn->moves;
1392                                 my @uci_moves = ();
1393                                 for my $move (@$moves) {
1394                                         my $uci_move;
1395                                         ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
1396                                         push @uci_moves, $uci_move;
1397                                 }
1398                                 $tb_cache{$fen} = {
1399                                         result => $pgn->result,
1400                                         pv => \@uci_moves,
1401                                         score => $response->{'Response'}{'Score'},
1402                                 };
1403                                 output();
1404                         }
1405                 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
1406                         # Try again in a second. Note that if we have changed
1407                         # position in the meantime, we might query a completely
1408                         # different position! But that's fine.
1409                 } else {
1410                         die "Unknown response state " . $state;
1411                 }
1412
1413                 # Wait a second before we schedule another one.
1414                 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
1415                         $tb_lookup_running = 0;
1416                         schedule_tb_lookup();
1417                 });
1418         };
1419         if ($@) {
1420                 warn "Error in tablebase lookup: $@";
1421
1422                 # Don't try this one again, but don't block new lookups either.
1423                 $tb_lookup_running = 0;
1424         }
1425 }
1426
1427 sub open_engine {
1428         my ($cmdline, $tag, $cb) = @_;
1429         return undef if (!defined($cmdline));
1430         return Engine->open($cmdline, $tag, $cb);
1431 }
1432
1433 sub col_letter_to_num {
1434         return ord(shift) - ord('a');
1435 }
1436
1437 sub row_letter_to_num {
1438         return 7 - (ord(shift) - ord('1'));
1439 }
1440
1441 sub parse_uci_move {
1442         my $move = shift;
1443         my $from_col = col_letter_to_num(substr($move, 0, 1));
1444         my $from_row = row_letter_to_num(substr($move, 1, 1));
1445         my $to_col   = col_letter_to_num(substr($move, 2, 1));
1446         my $to_row   = row_letter_to_num(substr($move, 3, 1));
1447         my $promo    = substr($move, 4, 1);
1448         return ($from_row, $from_col, $to_row, $to_col, $promo);
1449 }