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, $pos_calculating_second_engine);
  78
  79 setoptions($engine, \%remoteglotconf::engine_config);
  80 uciprint($engine, "ucinewgame");
  81
  82 if (defined($engine2)) {
  83         setoptions($engine2, \%remoteglotconf::engine2_config);
  84         uciprint($engine2, "setoption name MultiPV value 500");
  85         uciprint($engine2, "ucinewgame");
  86 }
  87
  88 print "Chess engine ready.\n";
  89
  90 # now talk to FICS
  91 my ($t, $ev1);
  92 if (defined($remoteglotconf::server)) {
  93         $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
  94         $t->input_log(\*FICSLOG);
  95         $t->open($remoteglotconf::server);
  96         $t->print($remoteglotconf::nick);
  97         $t->waitfor('/Press return to enter the server/');
  98         $t->cmd("");
  99
 100         # set some options
 101         $t->cmd("set shout 0");
 102         $t->cmd("set seek 0");
 103         $t->cmd("set style 12");
 104
 105         $ev1 = AnyEvent->io(
 106                 fh => fileno($t),
 107                 poll => 'r',
 108                 cb => sub {    # what callback to execute
 109                         while (1) {
 110                                 my $line = $t->getline(Timeout => 0, errmode => 'return');
 111                                 return if (!defined($line));
 112
 113                                 chomp $line;
 114                                 $line =~ tr/\r//d;
 115                                 handle_fics($line);
 116                         }
 117                 }
 118         );
 119 }
 120 if (defined($remoteglotconf::target)) {
 121         if ($remoteglotconf::target =~ /^(?:\/|https?:)/) {
 122                 fetch_pgn($remoteglotconf::target);
 123         } elsif (defined($t)) {
 124                 $t->cmd("observe $remoteglotconf::target");
 125         }
 126 }
 127 if (defined($t)) {
 128         print "FICS ready.\n";
 129 }
 130
 131 # Engine events have already been set up by Engine.pm.
 132 EV::run;
 133
 134 sub handle_uci {
 135         my ($engine, $line, $primary) = @_;
 136
 137         return if $line =~ /(upper|lower)bound/;
 138
 139         $line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 140         print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
 141
 142         # If we've sent a stop command, gobble up lines until we see bestmove.
 143         return if ($engine->{'stopping'} && $line !~ /^bestmove/);
 144         $engine->{'stopping'} = 0;
 145
 146         if ($line =~ /^info/) {
 147                 my (@infos) = split / /, $line;
 148                 shift @infos;
 149
 150                 parse_infos($engine, @infos);
 151         }
 152         if ($line =~ /^id/) {
 153                 my (@ids) = split / /, $line;
 154                 shift @ids;
 155
 156                 parse_ids($engine, @ids);
 157         }
 158         output();
 159 }
 160
 161 my $getting_movelist = 0;
 162 my $pos_for_movelist = undef;
 163 my @uci_movelist = ();
 164 my @pretty_movelist = ();
 165
 166 sub handle_fics {
 167         my $line = shift;
 168         if ($line =~ /^<12> /) {
 169                 handle_position(Position->new($line));
 170                 $t->cmd("moves");
 171         }
 172         if ($line =~ /^Movelist for game /) {
 173                 my $pos = $pos_calculating;
 174                 if (defined($pos)) {
 175                         @uci_movelist = ();
 176                         @pretty_movelist = ();
 177                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 178                         $getting_movelist = 1;
 179                 }
 180         }
 181         if ($getting_movelist &&
 182             $line =~ /^\s* \d+\. \s+                     # move number
 183                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 184                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 185                      /x) {
 186                 eval {
 187                         my $uci_move;
 188                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 189                         push @uci_movelist, $uci_move;
 190                         push @pretty_movelist, $1;
 191
 192                         if (defined($2)) {
 193                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 194                                 push @uci_movelist, $uci_move;
 195                                 push @pretty_movelist, $2;
 196                         }
 197                 };
 198                 if ($@) {
 199                         warn "Error when getting FICS move history: $@";
 200                         $getting_movelist = 0;
 201                 }
 202         }
 203         if ($getting_movelist &&
 204             $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
 205                 # End of movelist.
 206                 if (defined($pos_calculating)) {
 207                         if ($pos_calculating->fen() eq $pos_for_movelist->fen()) {
 208                                 $pos_calculating->{'history'} = \@pretty_movelist;
 209                         }
 210                 }
 211                 $getting_movelist = 0;
 212         }
 213         if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 214                 my ($who, $msg) = ($1, $2);
 215
 216                 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
 217
 218                 if ($msg =~ /^fics (.*?)$/) {
 219                         $t->cmd("tell $who Executing '$1' on FICS.");
 220                         $t->cmd($1);
 221                 } elsif ($msg =~ /^uci (.*?)$/) {
 222                         $t->cmd("tell $who Sending '$1' to the engine.");
 223                         print { $engine->{'write'} } "$1\n";
 224                 } elsif ($msg =~ /^pgn (.*?)$/) {
 225                         my $url = $1;
 226                         $t->cmd("tell $who Starting to poll '$url'.");
 227                         fetch_pgn($url);
 228                 } elsif ($msg =~ /^stoppgn$/) {
 229                         $t->cmd("tell $who Stopping poll.");
 230                         $stop_pgn_fetch = 1;
 231                         $http_timer = undef;
 232                 } elsif ($msg =~ /^quit$/) {
 233                         $t->cmd("tell $who Bye bye.");
 234                         exit;
 235                 } else {
 236                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 237                 }
 238         }
 239         #print "FICS: [$line]\n";
 240 }
 241
 242 # Starts periodic fetching of PGNs from the given URL.
 243 sub fetch_pgn {
 244         my ($url) = @_;
 245         if ($url =~ m#^/#) {  # Local file.
 246                 eval {
 247                         local $/ = undef;
 248                         open my $fh, "<", $url
 249                                 or die "$url: $!";
 250                         my $pgn = <$fh>;
 251                         close $fh;
 252                         handle_pgn($pgn, '', $url);
 253                 };
 254                 if ($@) {
 255                         warn "$url: $@";
 256                         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 257                                 fetch_pgn($url);
 258                         });
 259                 }
 260         } else {
 261                 AnyEvent::HTTP::http_get($url, sub {
 262                         handle_pgn(@_, $url);
 263                 });
 264         }
 265 }
 266
 267 my ($last_pgn_white, $last_pgn_black);
 268 my @last_pgn_uci_moves = ();
 269 my $pgn_hysteresis_counter = 0;
 270
 271 sub handle_pgn {
 272         my ($body, $header, $url) = @_;
 273
 274         if ($stop_pgn_fetch) {
 275                 $stop_pgn_fetch = 0;
 276                 $http_timer = undef;
 277                 return;
 278         }
 279
 280         my $pgn = Chess::PGN::Parse->new(undef, $body);
 281         if (!defined($pgn)) {
 282                 warn "Error in parsing PGN from $url [body='$body']\n";
 283         } elsif (!$pgn->read_game()) {
 284                 warn "Error in reading PGN game from $url [body='$body']\n";
 285         } elsif ($body !~ /^\[/) {
 286                 warn "Malformed PGN from $url [body='$body']\n";
 287         } else {
 288                 eval {
 289                         # Skip to the right game.
 290                         while (defined($remoteglotconf::pgn_filter) &&
 291                                !&$remoteglotconf::pgn_filter($pgn)) {
 292                                 $pgn->read_game() or die "Out of games during filtering";
 293                         }
 294
 295                         $pgn->parse_game({ save_comments => 'yes' });
 296                         my $white = $pgn->white;
 297                         my $black = $pgn->black;
 298                         $white =~ s/,.*//;  # Remove first name.
 299                         $black =~ s/,.*//;  # Remove first name.
 300                         my $tags = $pgn->tags();
 301                         my $pos;
 302                         if (exists($tags->{'FEN'})) {
 303                                 $pos = Position->from_fen($tags->{'FEN'});
 304                                 $pos->{'last_move'} = 'none';
 305                                 $pos->{'player_w'} = $white;
 306                                 $pos->{'player_b'} = $black;
 307                                 $pos->{'start_fen'} = $tags->{'FEN'};
 308                         } else {
 309                                 $pos = Position->start_pos($white, $black);
 310                         }
 311                         if (exists($tags->{'Variant'}) &&
 312                             $tags->{'Variant'} =~ /960|fischer/i) {
 313                                 $pos->{'chess960'} = 1;
 314                         } else {
 315                                 $pos->{'chess960'} = 0;
 316                         }
 317                         my $moves = $pgn->moves;
 318                         my @uci_moves = ();
 319                         my @repretty_moves = ();
 320                         for my $move (@$moves) {
 321                                 my ($npos, $uci_move) = $pos->make_pretty_move($move);
 322                                 push @uci_moves, $uci_move;
 323
 324                                 # Re-prettyprint the move.
 325                                 my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($uci_move);
 326                                 my ($pretty, undef) = $pos->{'board'}->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 327                                 push @repretty_moves, $pretty;
 328                                 $pos = $npos;
 329                         }
 330                         if ($pgn->result eq '1-0' || $pgn->result eq '1/2-1/2' || $pgn->result eq '0-1') {
 331                                 $pos->{'result'} = $pgn->result;
 332                         }
 333                         $pos->{'history'} = \@repretty_moves;
 334
 335                         extract_clock($pgn, $pos);
 336
 337                         # Sometimes, PGNs lose a move or two for a short while,
 338                         # or people push out new ones non-atomically.
 339                         # Thus, if we PGN doesn't change names but becomes
 340                         # shorter, we mistrust it for a few seconds.
 341                         my $trust_pgn = 1;
 342                         if (defined($last_pgn_white) && defined($last_pgn_black) &&
 343                             $last_pgn_white eq $pgn->white &&
 344                             $last_pgn_black eq $pgn->black &&
 345                             scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 346                                 if (++$pgn_hysteresis_counter < 3) {
 347                                         $trust_pgn = 0;
 348                                 }
 349                         }
 350                         if ($trust_pgn) {
 351                                 $last_pgn_white = $pgn->white;
 352                                 $last_pgn_black = $pgn->black;
 353                                 @last_pgn_uci_moves = @uci_moves;
 354                                 $pgn_hysteresis_counter = 0;
 355                                 handle_position($pos);
 356                         }
 357                 };
 358                 if ($@) {
 359                         warn "Error in parsing moves from $url: $@\n";
 360                 }
 361         }
 362
 363         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 364                 fetch_pgn($url);
 365         });
 366 }
 367
 368 sub handle_position {
 369         my ($pos) = @_;
 370         find_clock_start($pos, $pos_calculating);
 371
 372         # If we're already chewing on this and there's nothing else in the queue,
 373         # ignore it.
 374         if (defined($pos_calculating) && $pos->fen() eq $pos_calculating->fen()) {
 375                 $pos_calculating->{'result'} = $pos->{'result'};
 376                 for my $key ('white_clock', 'black_clock', 'white_clock_target', 'black_clock_target') {
 377                         $pos_calculating->{$key} //= $pos->{$key};
 378                 }
 379                 return;
 380         }
 381
 382         # If we're already thinking on something, stop and wait for the engine
 383         # to approve.
 384         if (defined($pos_calculating)) {
 385                 # Store the final data we have for this position in the history,
 386                 # with the precise clock information we just got from the new
 387                 # position. (Historic positions store the clock at the end of
 388                 # the position.)
 389                 #
 390                 # Do not output anything new to the main analysis; that's
 391                 # going to be obsolete really soon.
 392                 $pos_calculating->{'white_clock'} = $pos->{'white_clock'};
 393                 $pos_calculating->{'black_clock'} = $pos->{'black_clock'};
 394                 delete $pos_calculating->{'white_clock_target'};
 395                 delete $pos_calculating->{'black_clock_target'};
 396                 output_json(1);
 397
 398                 # Ask the engine to stop; we will throw away its data until it
 399                 # sends us "bestmove", signaling the end of it.
 400                 $engine->{'stopping'} = 1;
 401                 uciprint($engine, "stop");
 402         }
 403
 404         # It's wrong to just give the FEN (the move history is useful,
 405         # and per the UCI spec, we should really have sent "ucinewgame"),
 406         # but it's easier, and it works around a Stockfish repetition issue.
 407         if ($engine->{'chess960'} != $pos->{'chess960'}) {
 408                 uciprint($engine, "setoption name UCI_Chess960 value " . ($pos->{'chess960'} ? 'true' : 'false'));
 409                 $engine->{'chess960'} = $pos->{'chess960'};
 410         }
 411         uciprint($engine, "position fen " . $pos->fen());
 412         uciprint($engine, "go infinite");
 413         $pos_calculating = $pos;
 414
 415         if (defined($engine2)) {
 416                 if (defined($pos_calculating_second_engine)) {
 417                         $engine2->{'stopping'} = 1;
 418                         uciprint($engine2, "stop");
 419                 }
 420                 if ($engine2->{'chess960'} != $pos->{'chess960'}) {
 421                         uciprint($engine2, "setoption name UCI_Chess960 value " . ($pos->{'chess960'} ? 'true' : 'false'));
 422                         $engine2->{'chess960'} = $pos->{'chess960'};
 423                 }
 424                 uciprint($engine2, "position fen " . $pos->fen());
 425                 uciprint($engine2, "go infinite");
 426                 $pos_calculating_second_engine = $pos;
 427                 $engine2->{'info'} = {};
 428         }
 429
 430         $engine->{'info'} = {};
 431         $last_move = time;
 432
 433         schedule_tb_lookup();
 434
 435         #
 436         # Output a command every move to note that we're
 437         # still paying attention -- this is a good tradeoff,
 438         # since if no move has happened in the last half
 439         # hour, the analysis/relay has most likely stopped
 440         # and we should stop hogging server resources.
 441         #
 442         if (defined($t)) {
 443                 $t->cmd("date");
 444         }
 445 }
 446
 447 sub parse_infos {
 448         my ($engine, @x) = @_;
 449         my $mpv = '';
 450
 451         my $info = $engine->{'info'};
 452
 453         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 454         for my $i (0..$#x - 1) {
 455                 if ($x[$i] eq 'multipv') {
 456                         $mpv = $x[$i + 1];
 457                         next;
 458                 }
 459         }
 460
 461         while (scalar @x > 0) {
 462                 if ($x[0] eq 'multipv') {
 463                         # Dealt with above
 464                         shift @x;
 465                         shift @x;
 466                         next;
 467                 }
 468                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 469                         my $key = shift @x;
 470                         my $value = shift @x;
 471                         $info->{$key} = $value;
 472                         next;
 473                 }
 474                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 475                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 476                     $x[0] eq 'tbhits') {
 477                         my $key = shift @x;
 478                         my $value = shift @x;
 479                         $info->{$key . $mpv} = $value;
 480                         next;
 481                 }
 482                 if ($x[0] eq 'score') {
 483                         shift @x;
 484
 485                         delete $info->{'score_cp' . $mpv};
 486                         delete $info->{'score_mate' . $mpv};
 487
 488                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 489                                 if ($x[0] eq 'cp') {
 490                                         shift @x;
 491                                         $info->{'score_cp' . $mpv} = shift @x;
 492                                 } elsif ($x[0] eq 'mate') {
 493                                         shift @x;
 494                                         $info->{'score_mate' . $mpv} = shift @x;
 495                                 } else {
 496                                         shift @x;
 497                                 }
 498                         }
 499                         next;
 500                 }
 501                 if ($x[0] eq 'pv') {
 502                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 503                         last;
 504                 }
 505                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 506                         last;
 507                 }
 508
 509                 #print "unknown info '$x[0]', trying to recover...\n";
 510                 #shift @x;
 511                 die "Unknown info '" . join(',', @x) . "'";
 512
 513         }
 514 }
 515
 516 sub parse_ids {
 517         my ($engine, @x) = @_;
 518
 519         while (scalar @x > 0) {
 520                 if ($x[0] eq 'name') {
 521                         my $value = join(' ', @x);
 522                         $engine->{'id'}{'author'} = $value;
 523                         last;
 524                 }
 525
 526                 # unknown
 527                 shift @x;
 528         }
 529 }
 530
 531 sub prettyprint_pv_no_cache {
 532         my ($board, @pvs) = @_;
 533
 534         if (scalar @pvs == 0 || !defined($pvs[0])) {
 535                 return ();
 536         }
 537
 538         my $pv = shift @pvs;
 539         my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($pv);
 540         my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 541         return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
 542 }
 543
 544 sub prettyprint_pv {
 545         my ($pos, @pvs) = @_;
 546
 547         my $cachekey = join('', @pvs);
 548         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 549                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 550         } else {
 551                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 552                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 553                 return @res;
 554         }
 555 }
 556
 557 my %tbprobe_cache = ();
 558
 559 sub complete_using_tbprobe {
 560         my ($pos, $info, $mpv) = @_;
 561
 562         # We need Fathom installed to do standalone TB probes.
 563         return if (!defined($remoteglotconf::fathom_cmdline));
 564
 565         # If we already have a mate, don't bother; in some cases, it would even be
 566         # better than a tablebase score.
 567         return if defined($info->{'score_mate' . $mpv});
 568
 569         # If we have a draw or near-draw score, there's also not much interesting
 570         # we could add from a tablebase. We only really want mates.
 571         return if ($info->{'score_cp' . $mpv} >= -12250 && $info->{'score_cp' . $mpv} <= 12250);
 572
 573         # Run through the PV until we are at a 6-man position.
 574         # TODO: We could in theory only have 5-man data.
 575         my @pv = @{$info->{'pv' . $mpv}};
 576         my $key = $pos->fen() . " " . join('', @pv);
 577         my @moves = ();
 578         if (exists($tbprobe_cache{$key})) {
 579                 @moves = @{$tbprobe_cache{$key}};
 580         } else {
 581                 if ($mpv ne '') {
 582                         # Force doing at least one move of the PV.
 583                         my $move = shift @pv;
 584                         push @moves, $move;
 585                         $pos = $pos->make_move(parse_uci_move($move));
 586                 }
 587
 588                 while ($pos->num_pieces() > 6 && $#pv > -1) {
 589                         my $move = shift @pv;
 590                         push @moves, $move;
 591                         $pos = $pos->make_move(parse_uci_move($move));
 592                 }
 593
 594                 return if ($pos->num_pieces() > 6);
 595
 596                 my $fen = $pos->fen();
 597                 my $pgn_text = `fathom --path=/srv/syzygy "$fen"`;
 598                 my $pgn = Chess::PGN::Parse->new(undef, $pgn_text);
 599                 return if (!defined($pgn) || !$pgn->read_game() || ($pgn->result ne '0-1' && $pgn->result ne '1-0'));
 600                 $pgn->quick_parse_game;
 601                 $info->{'pv' . $mpv} = \@moves;
 602
 603                 # Splice the PV from the tablebase onto what we have so far.
 604                 for my $move (@{$pgn->moves}) {
 605                         last if $move eq '#';
 606                         my $uci_move;
 607                         ($pos, $uci_move) = $pos->make_pretty_move($move);
 608                         push @moves, $uci_move;
 609                 }
 610
 611                 $tbprobe_cache{$key} = \@moves;
 612         }
 613
 614         $info->{'pv' . $mpv} = \@moves;
 615
 616         my $matelen = int((1 + scalar @moves) / 2);
 617         if ((scalar @moves) % 2 == 0) {
 618                 $info->{'score_mate' . $mpv} = -$matelen;
 619         } else {
 620                 $info->{'score_mate' . $mpv} = $matelen;
 621         }
 622 }
 623
 624 sub output {
 625         #return;
 626
 627         return if (!defined($pos_calculating));
 628
 629         # Don't update too often.
 630         my $age = Time::HiRes::tv_interval($latest_update);
 631         if ($age < $remoteglotconf::update_max_interval) {
 632                 my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
 633                 $output_timer = AnyEvent->timer(after => $wait, cb => \&output);
 634                 return;
 635         }
 636
 637         my $info = $engine->{'info'};
 638
 639         #
 640         # If we have tablebase data from a previous lookup, replace the
 641         # engine data with the data from the tablebase.
 642         #
 643         my $fen = $pos_calculating->fen();
 644         if (exists($tb_cache{$fen})) {
 645                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 646                         delete $info->{$key . '1'};
 647                         delete $info->{$key};
 648                 }
 649                 $info->{'nodes'} = 0;
 650                 $info->{'nps'} = 0;
 651                 $info->{'depth'} = 0;
 652                 $info->{'seldepth'} = 0;
 653                 $info->{'tbhits'} = 0;
 654
 655                 my $t = $tb_cache{$fen};
 656                 my $pv = $t->{'pv'};
 657                 my $matelen = int((1 + $t->{'score'}) / 2);
 658                 if ($t->{'result'} eq '1/2-1/2') {
 659                         $info->{'score_cp'} = 0;
 660                 } elsif ($t->{'result'} eq '1-0') {
 661                         if ($pos_calculating->{'toplay'} eq 'B') {
 662                                 $info->{'score_mate'} = -$matelen;
 663                         } else {
 664                                 $info->{'score_mate'} = $matelen;
 665                         }
 666                 } else {
 667                         if ($pos_calculating->{'toplay'} eq 'B') {
 668                                 $info->{'score_mate'} = $matelen;
 669                         } else {
 670                                 $info->{'score_mate'} = -$matelen;
 671                         }
 672                 }
 673                 $info->{'pv'} = $pv;
 674                 $info->{'tablebase'} = 1;
 675         } else {
 676                 $info->{'tablebase'} = 0;
 677         }
 678
 679         #
 680         # Some programs _always_ report MultiPV, even with only one PV.
 681         # In this case, we simply use that data as if MultiPV was never
 682         # specified.
 683         #
 684         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 685                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 686                         if (exists($info->{$key . '1'})) {
 687                                 $info->{$key} = $info->{$key . '1'};
 688                         } else {
 689                                 delete $info->{$key};
 690                         }
 691                 }
 692         }
 693
 694         #
 695         # Check the PVs first. if they're invalid, just wait, as our data
 696         # is most likely out of sync. This isn't a very good solution, as
 697         # it can frequently miss stuff, but it's good enough for most users.
 698         #
 699         eval {
 700                 my $dummy;
 701                 if (exists($info->{'pv'})) {
 702                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 703                 }
 704
 705                 my $mpv = 1;
 706                 while (exists($info->{'pv' . $mpv})) {
 707                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 708                         ++$mpv;
 709                 }
 710         };
 711         if ($@) {
 712                 $engine->{'info'} = {};
 713                 return;
 714         }
 715
 716         # Now do our own Syzygy tablebase probes to convert scores like +123.45 to mate.
 717         if (exists($info->{'pv'})) {
 718                 complete_using_tbprobe($pos_calculating, $info, '');
 719         }
 720
 721         my $mpv = 1;
 722         while (exists($info->{'pv' . $mpv})) {
 723                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 724                 ++$mpv;
 725         }
 726
 727         output_screen();
 728         output_json(0);
 729         $latest_update = [Time::HiRes::gettimeofday];
 730 }
 731
 732 sub output_screen {
 733         my $info = $engine->{'info'};
 734         my $id = $engine->{'id'};
 735
 736         my $text = 'Analysis';
 737         if ($pos_calculating->{'last_move'} ne 'none') {
 738                 if ($pos_calculating->{'toplay'} eq 'W') {
 739                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 740                 } else {
 741                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 742                 }
 743                 if (exists($id->{'name'})) {
 744                         $text .= ',';
 745                 }
 746         }
 747
 748         if (exists($id->{'name'})) {
 749                 $text .= " by $id->{'name'}:\n\n";
 750         } else {
 751                 $text .= ":\n\n";
 752         }
 753
 754         return unless (exists($pos_calculating->{'board'}));
 755
 756         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 757                 # multi-PV
 758                 my $mpv = 1;
 759                 while (exists($info->{'pv' . $mpv})) {
 760                         $text .= sprintf "  PV%2u", $mpv;
 761                         my $score = short_score($info, $pos_calculating, $mpv);
 762                         $text .= "  ($score)" if (defined($score));
 763
 764                         my $tbhits = '';
 765                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 766                                 if ($info->{'tbhits' . $mpv} == 1) {
 767                                         $tbhits = ", 1 tbhit";
 768                                 } else {
 769                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 770                                 }
 771                         }
 772
 773                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 774                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 775                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 776                         }
 777
 778                         $text .= ":\n";
 779                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 780                         $text .= "\n";
 781                         ++$mpv;
 782                 }
 783         } else {
 784                 # single-PV
 785                 my $score = long_score($info, $pos_calculating, '');
 786                 $text .= "  $score\n" if defined($score);
 787                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 788                 $text .=  "\n";
 789
 790                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 791                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 792                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 793                 }
 794                 if (exists($info->{'seldepth'})) {
 795                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 796                 }
 797                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 798                         if ($info->{'tbhits'} == 1) {
 799                                 $text .= ", one Syzygy hit";
 800                         } else {
 801                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 802                         }
 803                 }
 804                 $text .= "\n\n";
 805         }
 806
 807         #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
 808
 809         my @refutation_lines = ();
 810         if (defined($engine2)) {
 811                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 812                         my $info = $engine2->{'info'};
 813                         last if (!exists($info->{'pv' . $mpv}));
 814                         eval {
 815                                 complete_using_tbprobe($pos_calculating_second_engine, $info, $mpv);
 816                                 my $pv = $info->{'pv' . $mpv};
 817                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 818                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 819                                 if (scalar @pretty_pv > 5) {
 820                                         @pretty_pv = @pretty_pv[0..4];
 821                                         push @pretty_pv, "...";
 822                                 }
 823                                 my $key = $pretty_move;
 824                                 my $line = sprintf("  %-6s %6s %3s  %s",
 825                                         $pretty_move,
 826                                         short_score($info, $pos_calculating_second_engine, $mpv),
 827                                         "d" . $info->{'depth' . $mpv},
 828                                         join(', ', @pretty_pv));
 829                                 push @refutation_lines, [ $key, $line ];
 830                         };
 831                 }
 832         }
 833
 834         if ($#refutation_lines >= 0) {
 835                 $text .= "Shallow search of all legal moves:\n\n";
 836                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 837                         $text .= $line->[1] . "\n";
 838                 }
 839                 $text .= "\n\n";
 840         }
 841
 842         if ($last_text ne $text) {
 843                 print "\e[H\e[2J"; # clear the screen
 844                 print $text;
 845                 $last_text = $text;
 846         }
 847 }
 848
 849 sub output_json {
 850         my $historic_json_only = shift;
 851         my $info = $engine->{'info'};
 852
 853         my $json = {};
 854         $json->{'position'} = $pos_calculating->to_json_hash();
 855         $json->{'engine'} = $engine->{'id'};
 856         if (defined($remoteglotconf::engine_url)) {
 857                 $json->{'engine'}{'url'} = $remoteglotconf::engine_url;
 858         }
 859         if (defined($remoteglotconf::engine_details)) {
 860                 $json->{'engine'}{'details'} = $remoteglotconf::engine_details;
 861         }
 862         my @grpc_backends = ();
 863         if (defined($remoteglotconf::engine_grpc_backend)) {
 864                 push @grpc_backends, $remoteglotconf::engine_grpc_backend;
 865         }
 866         if (defined($remoteglotconf::engine2_grpc_backend)) {
 867                 push @grpc_backends, $remoteglotconf::engine2_grpc_backend;
 868         }
 869         $json->{'internal'}{'grpc_backends'} = \@grpc_backends;
 870         if (defined($remoteglotconf::move_source)) {
 871                 $json->{'move_source'} = $remoteglotconf::move_source;
 872         }
 873         if (defined($remoteglotconf::move_source_url)) {
 874                 $json->{'move_source_url'} = $remoteglotconf::move_source_url;
 875         }
 876         $json->{'score'} = score_digest($info, $pos_calculating, '');
 877         $json->{'using_lomonosov'} = defined($remoteglotconf::tb_serial_key);
 878
 879         $json->{'nodes'} = $info->{'nodes'};
 880         $json->{'nps'} = $info->{'nps'};
 881         $json->{'depth'} = $info->{'depth'};
 882         $json->{'tbhits'} = $info->{'tbhits'};
 883         $json->{'seldepth'} = $info->{'seldepth'};
 884         $json->{'tablebase'} = $info->{'tablebase'};
 885         $json->{'pv'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 886
 887         my %refutation_lines = ();
 888         my @refutation_lines = ();
 889         if (defined($engine2)) {
 890                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 891                         my $info = $engine2->{'info'};
 892                         my $pretty_move = "";
 893                         my @pretty_pv = ();
 894                         last if (!exists($info->{'pv' . $mpv}));
 895
 896                         eval {
 897                                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 898                                 my $pv = $info->{'pv' . $mpv};
 899                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 900                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 901                                 $refutation_lines{$pretty_move} = {
 902                                         depth => $info->{'depth' . $mpv},
 903                                         score => score_digest($info, $pos_calculating, $mpv),
 904                                         move => $pretty_move,
 905                                         pv => \@pretty_pv,
 906                                 };
 907                         };
 908                 }
 909         }
 910         $json->{'refutation_lines'} = \%refutation_lines;
 911
 912         # Piece together historic score information, to the degree we have it.
 913         if (!$historic_json_only && exists($pos_calculating->{'history'})) {
 914                 my %score_history = ();
 915
 916                 local $dbh->{AutoCommit} = 0;
 917                 my $q = $dbh->prepare('SELECT * FROM scores WHERE id=?');
 918                 my $pos;
 919                 if (exists($pos_calculating->{'start_fen'})) {
 920                         $pos = Position->from_fen($pos_calculating->{'start_fen'});
 921                 } else {
 922                         $pos = Position->start_pos('white', 'black');
 923                 }
 924                 $pos->{'chess960'} = $pos_calculating->{'chess960'};
 925                 my $halfmove_num = 0;
 926                 for my $move (@{$pos_calculating->{'history'}}) {
 927                         my $id = id_for_pos($pos, $halfmove_num);
 928                         my $ref = $dbh->selectrow_hashref($q, undef, $id);
 929                         if (defined($ref)) {
 930                                 $score_history{$halfmove_num} = [
 931                                         $ref->{'score_type'},
 932                                         $ref->{'score_value'}
 933                                 ];
 934                         }
 935                         ++$halfmove_num;
 936                         ($pos) = $pos->make_pretty_move($move);
 937                 }
 938                 $q->finish;
 939                 $dbh->commit;
 940
 941                 # If at any point we are missing 10 consecutive moves,
 942                 # truncate the history there. This is so we don't get into
 943                 # a situation where we e.g. start analyzing at move 45,
 944                 # but we have analysis for 1. e4 from some completely different game
 945                 # and thus show a huge hole.
 946                 my $consecutive_missing = 0;
 947                 my $truncate_until = 0;
 948                 for (my $i = $halfmove_num; $i --> 0; ) {
 949                         if ($consecutive_missing >= 10) {
 950                                 delete $score_history{$i};
 951                                 next;
 952                         }
 953                         if (exists($score_history{$i})) {
 954                                 $consecutive_missing = 0;
 955                         } else {
 956                                 ++$consecutive_missing;
 957                         }
 958                 }
 959
 960                 $json->{'score_history'} = \%score_history;
 961         }
 962
 963         # Give out a list of other games going on. (Empty is fine.)
 964         # TODO: Don't bother reading our own file, the data will be stale anyway.
 965         if (!$historic_json_only) {
 966                 my @games = ();
 967
 968                 my $q = $dbh->prepare('SELECT * FROM current_games ORDER BY priority DESC, id');
 969                 $q->execute;
 970                 while (my $ref = $q->fetchrow_hashref) {
 971                         eval {
 972                                 my $other_game_contents = File::Slurp::read_file($ref->{'json_path'});
 973                                 my $other_game_json = JSON::XS::decode_json($other_game_contents);
 974
 975                                 die "Missing position" if (!exists($other_game_json->{'position'}));
 976                                 my $white = $other_game_json->{'position'}{'player_w'} // die 'Missing white';
 977                                 my $black = $other_game_json->{'position'}{'player_b'} // die 'Missing black';
 978
 979                                 my $game = {
 980                                         id => $ref->{'id'},
 981                                         name => "$white–$black",
 982                                         url => $ref->{'url'},
 983                                         hashurl => $ref->{'hash_url'},
 984                                 };
 985                                 if (defined($other_game_json->{'position'}{'result'})) {
 986                                         $game->{'result'} = $other_game_json->{'position'}{'result'};
 987                                 } else {
 988                                         $game->{'score'} = $other_game_json->{'score'};
 989                                 }
 990                                 push @games, $game;
 991                         };
 992                         if ($@) {
 993                                 warn "Could not add external game " . $ref->{'json_path'} . ": $@";
 994                         }
 995                 }
 996
 997                 if (scalar @games > 0) {
 998                         $json->{'games'} = \@games;
 999                 }
1000         }
1001
1002         my $json_enc = JSON::XS->new;
1003         $json_enc->canonical(1);
1004         my $encoded = $json_enc->encode($json);
1005         unless ($historic_json_only || !defined($remoteglotconf::json_output) ||
1006                 (defined($last_written_json) && $last_written_json eq $encoded)) {
1007                 atomic_set_contents($remoteglotconf::json_output, $encoded);
1008                 $last_written_json = $encoded;
1009         }
1010
1011         if (exists($pos_calculating->{'history'}) &&
1012             defined($remoteglotconf::json_history_dir)) {
1013                 my $id = id_for_pos($pos_calculating);
1014                 my $filename = $remoteglotconf::json_history_dir . "/" . $id . ".json";
1015
1016                 # Overwrite old analysis (assuming it exists at all) if we're
1017                 # using a different engine, or if we've calculated deeper.
1018                 # nodes is used as a tiebreaker. Don't bother about Multi-PV
1019                 # data; it's not that important.
1020                 my ($old_engine, $old_depth, $old_nodes) = get_json_analysis_stats($id);
1021                 my $new_depth = $json->{'depth'} // 0;
1022                 my $new_nodes = $json->{'nodes'} // 0;
1023                 if (!defined($old_engine) ||
1024                     $old_engine ne $json->{'engine'}{'name'} ||
1025                     $new_depth > $old_depth ||
1026                     ($new_depth == $old_depth && $new_nodes >= $old_nodes)) {
1027                         atomic_set_contents($filename, $encoded);
1028                         if (defined($json->{'score'})) {
1029                                 $dbh->do('INSERT INTO scores (id, score_type, score_value, engine, depth, nodes) VALUES (?,?,?,?,?,?) ' .
1030                                          '    ON CONFLICT (id) DO UPDATE SET ' .
1031                                          '        score_type=EXCLUDED.score_type, ' .
1032                                          '        score_value=EXCLUDED.score_value, ' .
1033                                          '        engine=EXCLUDED.engine, ' .
1034                                          '        depth=EXCLUDED.depth, ' .
1035                                          '        nodes=EXCLUDED.nodes',
1036                                         undef,
1037                                         $id, $json->{'score'}[0], $json->{'score'}[1],
1038                                         $json->{'engine'}{'name'}, $new_depth, $new_nodes);
1039                         }
1040                 }
1041         }
1042 }
1043
1044 sub atomic_set_contents {
1045         my ($filename, $contents) = @_;
1046
1047         open my $fh, ">", $filename . ".tmp"
1048                 or return;
1049         print $fh $contents;
1050         close $fh;
1051         rename($filename . ".tmp", $filename);
1052 }
1053
1054 sub id_for_pos {
1055         my ($pos, $halfmove_num) = @_;
1056
1057         $halfmove_num //= scalar @{$pos->{'history'}};
1058         (my $fen = $pos->fen()) =~ tr,/ ,-_,;
1059         return "move$halfmove_num-$fen";
1060 }
1061
1062 sub get_json_analysis_stats {
1063         my $id = shift;
1064         my $ref = $dbh->selectrow_hashref('SELECT * FROM scores WHERE id=?', undef, $id);
1065         if (defined($ref)) {
1066                 return ($ref->{'engine'}, $ref->{'depth'}, $ref->{'nodes'});
1067         } else {
1068                 return ('', 0, 0);
1069         }
1070 }
1071
1072 sub uciprint {
1073         my ($engine, $msg) = @_;
1074         $engine->print($msg);
1075         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
1076 }
1077
1078 sub short_score {
1079         my ($info, $pos, $mpv) = @_;
1080
1081         my $invert = ($pos->{'toplay'} eq 'B');
1082         if (defined($info->{'score_mate' . $mpv})) {
1083                 if ($invert) {
1084                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
1085                 } else {
1086                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
1087                 }
1088         } else {
1089                 if (exists($info->{'score_cp' . $mpv})) {
1090                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1091                         if ($score == 0) {
1092                                 if ($info->{'tablebase'}) {
1093                                         return "TB draw";
1094                                 } else {
1095                                         return " 0.00";
1096                                 }
1097                         }
1098                         if ($invert) {
1099                                 $score = -$score;
1100                         }
1101                         return sprintf "%+5.2f", $score;
1102                 }
1103         }
1104
1105         return undef;
1106 }
1107
1108 # Sufficient for computing long_score, short_score, plot_score and
1109 # (with side-to-play information) score_sort_key.
1110 sub score_digest {
1111         my ($info, $pos, $mpv) = @_;
1112
1113         if (defined($info->{'score_mate' . $mpv})) {
1114                 my $mate = $info->{'score_mate' . $mpv};
1115                 if ($pos->{'toplay'} eq 'B') {
1116                         $mate = -$mate;
1117                 }
1118                 return ['m', $mate];
1119         } else {
1120                 if (exists($info->{'score_cp' . $mpv})) {
1121                         my $score = $info->{'score_cp' . $mpv};
1122                         if ($pos->{'toplay'} eq 'B') {
1123                                 $score = -$score;
1124                         }
1125                         if ($score == 0 && $info->{'tablebase'}) {
1126                                 return ['d', undef];
1127                         } else {
1128                                 return ['cp', int($score)];
1129                         }
1130                 }
1131         }
1132
1133         return undef;
1134 }
1135
1136 sub long_score {
1137         my ($info, $pos, $mpv) = @_;
1138
1139         if (defined($info->{'score_mate' . $mpv})) {
1140                 my $mate = $info->{'score_mate' . $mpv};
1141                 if ($pos->{'toplay'} eq 'B') {
1142                         $mate = -$mate;
1143                 }
1144                 if ($mate > 0) {
1145                         return sprintf "White mates in %u", $mate;
1146                 } else {
1147                         return sprintf "Black mates in %u", -$mate;
1148                 }
1149         } else {
1150                 if (exists($info->{'score_cp' . $mpv})) {
1151                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1152                         if ($score == 0) {
1153                                 if ($info->{'tablebase'}) {
1154                                         return "Theoretical draw";
1155                                 } else {
1156                                         return "Score:  0.00";
1157                                 }
1158                         }
1159                         if ($pos->{'toplay'} eq 'B') {
1160                                 $score = -$score;
1161                         }
1162                         return sprintf "Score: %+5.2f", $score;
1163                 }
1164         }
1165
1166         return undef;
1167 }
1168
1169 # For graphs; a single number in centipawns, capped at +/- 500.
1170 sub plot_score {
1171         my ($info, $pos, $mpv) = @_;
1172
1173         my $invert = ($pos->{'toplay'} eq 'B');
1174         if (defined($info->{'score_mate' . $mpv})) {
1175                 my $mate = $info->{'score_mate' . $mpv};
1176                 if ($invert) {
1177                         $mate = -$mate;
1178                 }
1179                 if ($mate > 0) {
1180                         return 500;
1181                 } else {
1182                         return -500;
1183                 }
1184         } else {
1185                 if (exists($info->{'score_cp' . $mpv})) {
1186                         my $score = $info->{'score_cp' . $mpv};
1187                         if ($invert) {
1188                                 $score = -$score;
1189                         }
1190                         $score = 500 if ($score > 500);
1191                         $score = -500 if ($score < -500);
1192                         return int($score);
1193                 }
1194         }
1195
1196         return undef;
1197 }
1198
1199 my %book_cache = ();
1200 sub book_info {
1201         my ($fen, $board, $toplay) = @_;
1202
1203         if (exists($book_cache{$fen})) {
1204                 return $book_cache{$fen};
1205         }
1206
1207         my $ret = `./booklook $fen`;
1208         return "" if ($ret =~ /Not found/ || $ret eq '');
1209
1210         my @moves = ();
1211
1212         for my $m (split /\n/, $ret) {
1213                 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
1214
1215                 my $pmove;
1216                 if ($move eq '')  {
1217                         $pmove = '(current)';
1218                 } else {
1219                         ($pmove) = prettyprint_pv_no_cache($board, $move);
1220                         $pmove .= $annotation;
1221                 }
1222
1223                 my $score;
1224                 if ($toplay eq 'W') {
1225                         $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
1226                 } else {
1227                         $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
1228                 }
1229                 my $n = $win + $draw + $lose;
1230
1231                 my $percent;
1232                 if ($n == 0) {
1233                         $percent = "     ";
1234                 } else {
1235                         $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
1236                 }
1237
1238                 push @moves, [ $pmove, $n, $percent, $rating ];
1239         }
1240
1241         @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
1242
1243         my $text = "Book moves:\n\n              Perf.     N     Rating\n\n";
1244         for my $m (@moves) {
1245                 $text .= sprintf "  %-10s %s   %6u    %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
1246         }
1247
1248         return $text;
1249 }
1250
1251 sub extract_clock {
1252         my ($pgn, $pos) = @_;
1253
1254         # Look for extended PGN clock tags.
1255         my $tags = $pgn->tags;
1256         if (exists($tags->{'WhiteClock'}) && exists($tags->{'BlackClock'})) {
1257                 $pos->{'white_clock'} = hms_to_sec($tags->{'WhiteClock'});
1258                 $pos->{'black_clock'} = hms_to_sec($tags->{'BlackClock'});
1259                 return;
1260         }
1261
1262         # Look for TCEC-style time comments.
1263         my $moves = $pgn->moves;
1264         my $comments = $pgn->comments;
1265         my $last_black_move = int((scalar @$moves) / 2);
1266         my $last_white_move = int((1 + scalar @$moves) / 2);
1267
1268         my $black_key = $last_black_move . "b";
1269         my $white_key = $last_white_move . "w";
1270
1271         if (exists($comments->{$white_key}) &&
1272             exists($comments->{$black_key}) &&
1273             $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/ &&
1274             $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/) {
1275                 $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1276                 $pos->{'white_clock'} = hms_to_sec($1);
1277                 $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1278                 $pos->{'black_clock'} = hms_to_sec($1);
1279                 return;
1280         }
1281
1282         delete $pos->{'white_clock'};
1283         delete $pos->{'black_clock'};
1284 }
1285
1286 sub hms_to_sec {
1287         my $hms = shift;
1288         return undef if (!defined($hms));
1289         $hms =~ /(\d+):(\d+):(\d+)/;
1290         return $1 * 3600 + $2 * 60 + $3;
1291 }
1292
1293 sub find_clock_start {
1294         my ($pos, $prev_pos) = @_;
1295
1296         # If the game is over, the clock is stopped.
1297         if (exists($pos->{'result'}) &&
1298             ($pos->{'result'} eq '1-0' ||
1299              $pos->{'result'} eq '1/2-1/2' ||
1300              $pos->{'result'} eq '0-1')) {
1301                 return;
1302         }
1303
1304         # When we don't have any moves, we assume the clock hasn't started yet.
1305         if ($pos->{'move_num'} == 1 && $pos->{'toplay'} eq 'W') {
1306                 if (defined($remoteglotconf::adjust_clocks_before_move)) {
1307                         &$remoteglotconf::adjust_clocks_before_move(\$pos->{'white_clock'}, \$pos->{'black_clock'}, 1, 'W');
1308                 }
1309                 return;
1310         }
1311
1312         # TODO(sesse): Maybe we can get the number of moves somehow else for FICS games.
1313         # The history is needed for id_for_pos.
1314         if (!exists($pos->{'history'})) {
1315                 return;
1316         }
1317
1318         my $id = id_for_pos($pos);
1319         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, $id);
1320         if (defined($clock_info)) {
1321                 $pos->{'white_clock'} //= $clock_info->{'white_clock'};
1322                 $pos->{'black_clock'} //= $clock_info->{'black_clock'};
1323                 if ($pos->{'toplay'} eq 'W') {
1324                         $pos->{'white_clock_target'} = $clock_info->{'white_clock_target'};
1325                 } else {
1326                         $pos->{'black_clock_target'} = $clock_info->{'black_clock_target'};
1327                 }
1328                 return;
1329         }
1330
1331         # OK, we haven't seen this position before, so we assume the move
1332         # happened right now.
1333
1334         # See if we should do our own clock management (ie., clock information
1335         # is spurious or non-existent).
1336         if (defined($remoteglotconf::adjust_clocks_before_move)) {
1337                 my $wc = $pos->{'white_clock'} // $prev_pos->{'white_clock'};
1338                 my $bc = $pos->{'black_clock'} // $prev_pos->{'black_clock'};
1339                 if (defined($prev_pos->{'white_clock_target'})) {
1340                         $wc = $prev_pos->{'white_clock_target'} - time;
1341                 }
1342                 if (defined($prev_pos->{'black_clock_target'})) {
1343                         $bc = $prev_pos->{'black_clock_target'} - time;
1344                 }
1345                 &$remoteglotconf::adjust_clocks_before_move(\$wc, \$bc, $pos->{'move_num'}, $pos->{'toplay'});
1346                 $pos->{'white_clock'} = $wc;
1347                 $pos->{'black_clock'} = $bc;
1348         }
1349
1350         my $key = ($pos->{'toplay'} eq 'W') ? 'white_clock' : 'black_clock';
1351         if (!exists($pos->{$key})) {
1352                 # No clock information.
1353                 return;
1354         }
1355         my $time_left = $pos->{$key};
1356         my ($white_clock_target, $black_clock_target);
1357         if ($pos->{'toplay'} eq 'W') {
1358                 $white_clock_target = $pos->{'white_clock_target'} = time + $time_left;
1359         } else {
1360                 $black_clock_target = $pos->{'black_clock_target'} = time + $time_left;
1361         }
1362         local $dbh->{AutoCommit} = 0;
1363         $dbh->do('DELETE FROM clock_info WHERE id=?', undef, $id);
1364         $dbh->do('INSERT INTO clock_info (id, white_clock, black_clock, white_clock_target, black_clock_target) VALUES (?, ?, ?, ?, ?)', undef,
1365                 $id, $pos->{'white_clock'}, $pos->{'black_clock'}, $white_clock_target, $black_clock_target);
1366         $dbh->commit;
1367 }
1368
1369 sub schedule_tb_lookup {
1370         return if (!defined($remoteglotconf::tb_serial_key));
1371         my $pos = $pos_calculating;
1372         return if (exists($tb_cache{$pos->fen()}));
1373
1374         # If there's more than seven pieces, there's not going to be an answer,
1375         # so don't bother.
1376         return if ($pos->num_pieces() > 7);
1377
1378         # Max one at a time. If it's still relevant when it returns,
1379         # schedule_tb_lookup() will be called again.
1380         return if ($tb_lookup_running);
1381
1382         $tb_lookup_running = 1;
1383         my $url = 'http://tb7-api.chessok.com:6904/tasks/addtask?auth.login=' .
1384                 $remoteglotconf::tb_serial_key .
1385                 '&auth.password=aquarium&type=0&fen=' .
1386                 URI::Escape::uri_escape($pos->fen());
1387         print TBLOG "Downloading $url...\n";
1388         AnyEvent::HTTP::http_get($url, sub {
1389                 handle_tb_lookup_return(@_, $pos, $pos->fen());
1390         });
1391 }
1392
1393 sub handle_tb_lookup_return {
1394         my ($body, $header, $pos, $fen) = @_;
1395         print TBLOG "Response for [$fen]:\n";
1396         print TBLOG $header . "\n\n";
1397         print TBLOG $body . "\n\n";
1398         eval {
1399                 my $response = JSON::XS::decode_json($body);
1400                 if ($response->{'ErrorCode'} != 0) {
1401                         die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
1402                 }
1403                 my $state = $response->{'Response'}{'StateString'};
1404                 if ($state eq 'COMPLETE') {
1405                         my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
1406                         if (!defined($pgn) || !$pgn->read_game()) {
1407                                 warn "Error in parsing PGN\n";
1408                         } else {
1409                                 $pgn->quick_parse_game;
1410                                 my $pvpos = $pos;
1411                                 my $moves = $pgn->moves;
1412                                 my @uci_moves = ();
1413                                 for my $move (@$moves) {
1414                                         my $uci_move;
1415                                         ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
1416                                         push @uci_moves, $uci_move;
1417                                 }
1418                                 $tb_cache{$fen} = {
1419                                         result => $pgn->result,
1420                                         pv => \@uci_moves,
1421                                         score => $response->{'Response'}{'Score'},
1422                                 };
1423                                 output();
1424                         }
1425                 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
1426                         # Try again in a second. Note that if we have changed
1427                         # position in the meantime, we might query a completely
1428                         # different position! But that's fine.
1429                 } else {
1430                         die "Unknown response state " . $state;
1431                 }
1432
1433                 # Wait a second before we schedule another one.
1434                 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
1435                         $tb_lookup_running = 0;
1436                         schedule_tb_lookup();
1437                 });
1438         };
1439         if ($@) {
1440                 warn "Error in tablebase lookup: $@";
1441
1442                 # Don't try this one again, but don't block new lookups either.
1443                 $tb_lookup_running = 0;
1444         }
1445 }
1446
1447 sub open_engine {
1448         my ($cmdline, $tag, $cb) = @_;
1449         return undef if (!defined($cmdline));
1450         return Engine->open($cmdline, $tag, $cb);
1451 }
1452
1453 sub col_letter_to_num {
1454         return ord(shift) - ord('a');
1455 }
1456
1457 sub row_letter_to_num {
1458         return 7 - (ord(shift) - ord('1'));
1459 }
1460
1461 sub parse_uci_move {
1462         my $move = shift;
1463         my $from_col = col_letter_to_num(substr($move, 0, 1));
1464         my $from_row = row_letter_to_num(substr($move, 1, 1));
1465         my $to_col   = col_letter_to_num(substr($move, 2, 1));
1466         my $to_row   = row_letter_to_num(substr($move, 3, 1));
1467         my $promo    = substr($move, 4, 1);
1468         return ($from_row, $from_col, $to_row, $to_col, $promo);
1469 }
1470
1471 sub setoptions {
1472         my ($engine, $config) = @_;
1473         uciprint($engine, "setoption name UCI_AnalyseMode value true");
1474         uciprint($engine, "setoption name Analysis Contempt value Off");
1475         if (exists($config->{'Threads'})) {  # Threads first, because clearing hash can be multithreaded then.
1476                 uciprint($engine, "setoption name Threads value " . $config->{'Threads'});
1477         }
1478         while (my ($key, $value) = each %$config) {
1479                 next if $key eq 'Threads';
1480                 uciprint($engine, "setoption name $key value $value");
1481         }
1482 }