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 # If not undef, we've started calculating this position but haven't ever given out
  80 # any analysis for it, so we're on a forced timer to do so.
  81 my $pos_calculating_started = undef;
  82
  83 # If not undef, we've output this position, but without a main PV, so we're on
  84 # _another_ forced timer to do so.
  85 my $pos_pv_started = undef;
  86 my $last_output_had_pv = 0;
  87
  88 setoptions($engine, \%remoteglotconf::engine_config);
  89 uciprint($engine, "ucinewgame");
  90
  91 if (defined($engine2)) {
  92         setoptions($engine2, \%remoteglotconf::engine2_config);
  93         uciprint($engine2, "setoption name MultiPV value 500");
  94         uciprint($engine2, "ucinewgame");
  95 }
  96
  97 print "Chess engine ready.\n";
  98
  99 # now talk to FICS
 100 my ($t, $ev1);
 101 if (defined($remoteglotconf::server)) {
 102         $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
 103         $t->input_log(\*FICSLOG);
 104         $t->open($remoteglotconf::server);
 105         $t->print($remoteglotconf::nick);
 106         $t->waitfor('/Press return to enter the server/');
 107         $t->cmd("");
 108
 109         # set some options
 110         $t->cmd("set shout 0");
 111         $t->cmd("set seek 0");
 112         $t->cmd("set style 12");
 113
 114         $ev1 = AnyEvent->io(
 115                 fh => fileno($t),
 116                 poll => 'r',
 117                 cb => sub {    # what callback to execute
 118                         while (1) {
 119                                 my $line = $t->getline(Timeout => 0, errmode => 'return');
 120                                 return if (!defined($line));
 121
 122                                 chomp $line;
 123                                 $line =~ tr/\r//d;
 124                                 handle_fics($line);
 125                         }
 126                 }
 127         );
 128 }
 129 if (defined($remoteglotconf::target)) {
 130         if ($remoteglotconf::target =~ /^(?:\/|https?:)/) {
 131                 fetch_pgn($remoteglotconf::target);
 132         } elsif (defined($t)) {
 133                 $t->cmd("observe $remoteglotconf::target");
 134         }
 135 }
 136 if (defined($t)) {
 137         print "FICS ready.\n";
 138 }
 139
 140 # Engine events have already been set up by Engine.pm.
 141 EV::run;
 142
 143 sub handle_uci {
 144         my ($engine, $line, $primary) = @_;
 145
 146         return if $line =~ /(upper|lower)bound/;
 147
 148         $line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 149         print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
 150
 151         # If we've sent a stop command, gobble up lines until we see bestmove.
 152         return if ($engine->{'stopping'} && $line !~ /^bestmove/);
 153         $engine->{'stopping'} = 0;
 154
 155         if ($line =~ /^info/) {
 156                 my (@infos) = split / /, $line;
 157                 shift @infos;
 158
 159                 parse_infos($engine, @infos);
 160         }
 161         if ($line =~ /^id/) {
 162                 my (@ids) = split / /, $line;
 163                 shift @ids;
 164
 165                 parse_ids($engine, @ids);
 166         }
 167         output();
 168 }
 169
 170 my $getting_movelist = 0;
 171 my $pos_for_movelist = undef;
 172 my @uci_movelist = ();
 173 my @pretty_movelist = ();
 174
 175 sub handle_fics {
 176         my $line = shift;
 177         if ($line =~ /^<12> /) {
 178                 handle_position(Position->new($line));
 179                 $t->cmd("moves");
 180         }
 181         if ($line =~ /^Movelist for game /) {
 182                 my $pos = $pos_calculating;
 183                 if (defined($pos)) {
 184                         @uci_movelist = ();
 185                         @pretty_movelist = ();
 186                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 187                         $getting_movelist = 1;
 188                 }
 189         }
 190         if ($getting_movelist &&
 191             $line =~ /^\s* \d+\. \s+                     # move number
 192                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 193                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 194                      /x) {
 195                 eval {
 196                         my $uci_move;
 197                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 198                         push @uci_movelist, $uci_move;
 199                         push @pretty_movelist, $1;
 200
 201                         if (defined($2)) {
 202                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 203                                 push @uci_movelist, $uci_move;
 204                                 push @pretty_movelist, $2;
 205                         }
 206                 };
 207                 if ($@) {
 208                         warn "Error when getting FICS move history: $@";
 209                         $getting_movelist = 0;
 210                 }
 211         }
 212         if ($getting_movelist &&
 213             $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
 214                 # End of movelist.
 215                 if (defined($pos_calculating)) {
 216                         if ($pos_calculating->fen() eq $pos_for_movelist->fen()) {
 217                                 $pos_calculating->{'history'} = \@pretty_movelist;
 218                         }
 219                 }
 220                 $getting_movelist = 0;
 221         }
 222         if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 223                 my ($who, $msg) = ($1, $2);
 224
 225                 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
 226
 227                 if ($msg =~ /^fics (.*?)$/) {
 228                         $t->cmd("tell $who Executing '$1' on FICS.");
 229                         $t->cmd($1);
 230                 } elsif ($msg =~ /^uci (.*?)$/) {
 231                         $t->cmd("tell $who Sending '$1' to the engine.");
 232                         print { $engine->{'write'} } "$1\n";
 233                 } elsif ($msg =~ /^pgn (.*?)$/) {
 234                         my $url = $1;
 235                         $t->cmd("tell $who Starting to poll '$url'.");
 236                         fetch_pgn($url);
 237                 } elsif ($msg =~ /^stoppgn$/) {
 238                         $t->cmd("tell $who Stopping poll.");
 239                         $stop_pgn_fetch = 1;
 240                         $http_timer = undef;
 241                 } elsif ($msg =~ /^quit$/) {
 242                         $t->cmd("tell $who Bye bye.");
 243                         exit;
 244                 } else {
 245                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 246                 }
 247         }
 248         #print "FICS: [$line]\n";
 249 }
 250
 251 # Starts periodic fetching of PGNs from the given URL.
 252 sub fetch_pgn {
 253         my ($url) = @_;
 254         if ($url =~ m#^/#) {  # Local file.
 255                 eval {
 256                         local $/ = undef;
 257                         open my $fh, "<", $url
 258                                 or die "$url: $!";
 259                         my $pgn = <$fh>;
 260                         close $fh;
 261                         handle_pgn($pgn, '', $url);
 262                 };
 263                 if ($@) {
 264                         warn "$url: $@";
 265                         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 266                                 fetch_pgn($url);
 267                         });
 268                 }
 269         } else {
 270                 AnyEvent::HTTP::http_get($url, sub {
 271                         handle_pgn(@_, $url);
 272                 });
 273         }
 274 }
 275
 276 my ($last_pgn_white, $last_pgn_black);
 277 my @last_pgn_uci_moves = ();
 278 my $pgn_hysteresis_counter = 0;
 279
 280 sub handle_pgn {
 281         my ($body, $header, $url) = @_;
 282
 283         if ($stop_pgn_fetch) {
 284                 $stop_pgn_fetch = 0;
 285                 $http_timer = undef;
 286                 return;
 287         }
 288
 289         my $pgn = Chess::PGN::Parse->new(undef, $body);
 290         if (!defined($pgn)) {
 291                 warn "Error in parsing PGN from $url [body='$body']\n";
 292         } elsif (!$pgn->read_game()) {
 293                 warn "Error in reading PGN game from $url [body='$body']\n";
 294         } elsif ($body !~ /^\[/) {
 295                 warn "Malformed PGN from $url [body='$body']\n";
 296         } else {
 297                 eval {
 298                         # Skip to the right game.
 299                         while (defined($remoteglotconf::pgn_filter) &&
 300                                !&$remoteglotconf::pgn_filter($pgn)) {
 301                                 $pgn->read_game() or die "Out of games during filtering";
 302                         }
 303
 304                         $pgn->parse_game({ save_comments => 'yes' });
 305                         my $white = $pgn->white;
 306                         my $black = $pgn->black;
 307                         $white =~ s/,.*//;  # Remove first name.
 308                         $black =~ s/,.*//;  # Remove first name.
 309                         my $tags = $pgn->tags();
 310                         my $pos;
 311                         if (exists($tags->{'FEN'})) {
 312                                 $pos = Position->from_fen($tags->{'FEN'});
 313                                 $pos->{'last_move'} = 'none';
 314                                 $pos->{'player_w'} = $white;
 315                                 $pos->{'player_b'} = $black;
 316                                 $pos->{'start_fen'} = $tags->{'FEN'};
 317                         } else {
 318                                 $pos = Position->start_pos($white, $black);
 319                         }
 320                         if (exists($tags->{'Variant'}) &&
 321                             $tags->{'Variant'} =~ /960|fischer/i) {
 322                                 $pos->{'chess960'} = 1;
 323                         } else {
 324                                 $pos->{'chess960'} = 0;
 325                         }
 326                         my $moves = $pgn->moves;
 327                         my @uci_moves = ();
 328                         my @repretty_moves = ();
 329                         for my $move (@$moves) {
 330                                 my ($npos, $uci_move) = $pos->make_pretty_move($move);
 331                                 push @uci_moves, $uci_move;
 332
 333                                 # Re-prettyprint the move.
 334                                 my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($uci_move);
 335                                 my ($pretty, undef) = $pos->{'board'}->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 336                                 push @repretty_moves, $pretty;
 337                                 $pos = $npos;
 338                         }
 339                         if ($pgn->result eq '1-0' || $pgn->result eq '1/2-1/2' || $pgn->result eq '0-1') {
 340                                 $pos->{'result'} = $pgn->result;
 341                         }
 342                         $pos->{'history'} = \@repretty_moves;
 343
 344                         extract_clock($pgn, $pos);
 345
 346                         # Sometimes, PGNs lose a move or two for a short while,
 347                         # or people push out new ones non-atomically.
 348                         # Thus, if we PGN doesn't change names but becomes
 349                         # shorter, we mistrust it for a few seconds.
 350                         my $trust_pgn = 1;
 351                         if (defined($last_pgn_white) && defined($last_pgn_black) &&
 352                             $last_pgn_white eq $pgn->white &&
 353                             $last_pgn_black eq $pgn->black &&
 354                             scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 355                                 if (++$pgn_hysteresis_counter < 3) {
 356                                         $trust_pgn = 0;
 357                                 }
 358                         }
 359                         if ($trust_pgn) {
 360                                 $last_pgn_white = $pgn->white;
 361                                 $last_pgn_black = $pgn->black;
 362                                 @last_pgn_uci_moves = @uci_moves;
 363                                 $pgn_hysteresis_counter = 0;
 364                                 handle_position($pos);
 365                         }
 366                 };
 367                 if ($@) {
 368                         warn "Error in parsing moves from $url: $@\n";
 369                 }
 370         }
 371
 372         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 373                 fetch_pgn($url);
 374         });
 375 }
 376
 377 sub handle_position {
 378         my ($pos) = @_;
 379         find_clock_start($pos, $pos_calculating);
 380
 381         # If we're already chewing on this and there's nothing else in the queue,
 382         # ignore it.
 383         if (defined($pos_calculating) && $pos->fen() eq $pos_calculating->fen()) {
 384                 $pos_calculating->{'result'} = $pos->{'result'};
 385                 for my $key ('white_clock', 'black_clock', 'white_clock_target', 'black_clock_target') {
 386                         $pos_calculating->{$key} //= $pos->{$key};
 387                 }
 388                 return;
 389         }
 390
 391         # If we're already thinking on something, stop and wait for the engine
 392         # to approve.
 393         if (defined($pos_calculating)) {
 394                 # Store the final data we have for this position in the history,
 395                 # with the precise clock information we just got from the new
 396                 # position. (Historic positions store the clock at the end of
 397                 # the position.)
 398                 #
 399                 # Do not output anything new to the main analysis; that's
 400                 # going to be obsolete really soon. (Exception: If we've never
 401                 # output anything for this move, ie., it didn't hit the 200ms
 402                 # limit, spit it out to the user anyway. It's probably a really
 403                 # fast blitz game or something, and it's good to show the moves
 404                 # as they come in even without great analysis.)
 405                 $pos_calculating->{'white_clock'} = $pos->{'white_clock'};
 406                 $pos_calculating->{'black_clock'} = $pos->{'black_clock'};
 407                 delete $pos_calculating->{'white_clock_target'};
 408                 delete $pos_calculating->{'black_clock_target'};
 409
 410                 if (defined($pos_calculating_started)) {
 411                         output_json(0);
 412                 } else {
 413                         output_json(1);
 414                 }
 415                 $pos_calculating_started = [Time::HiRes::gettimeofday];
 416                 $pos_pv_started = undef;
 417
 418                 # Ask the engine to stop; we will throw away its data until it
 419                 # sends us "bestmove", signaling the end of it.
 420                 $engine->{'stopping'} = 1;
 421                 uciprint($engine, "stop");
 422         }
 423
 424         # It's wrong to just give the FEN (the move history is useful,
 425         # and per the UCI spec, we should really have sent "ucinewgame"),
 426         # but it's easier, and it works around a Stockfish repetition issue.
 427         if ($engine->{'chess960'} != $pos->{'chess960'}) {
 428                 uciprint($engine, "setoption name UCI_Chess960 value " . ($pos->{'chess960'} ? 'true' : 'false'));
 429                 $engine->{'chess960'} = $pos->{'chess960'};
 430         }
 431         uciprint($engine, "position fen " . $pos->fen());
 432         uciprint($engine, "go infinite");
 433         $pos_calculating = $pos;
 434         $pos_calculating_started = [Time::HiRes::gettimeofday];
 435         $pos_pv_started = undef;
 436
 437         if (defined($engine2)) {
 438                 if (defined($pos_calculating_second_engine)) {
 439                         $engine2->{'stopping'} = 1;
 440                         uciprint($engine2, "stop");
 441                 }
 442                 if ($engine2->{'chess960'} != $pos->{'chess960'}) {
 443                         uciprint($engine2, "setoption name UCI_Chess960 value " . ($pos->{'chess960'} ? 'true' : 'false'));
 444                         $engine2->{'chess960'} = $pos->{'chess960'};
 445                 }
 446                 uciprint($engine2, "position fen " . $pos->fen());
 447                 uciprint($engine2, "go infinite");
 448                 $pos_calculating_second_engine = $pos;
 449                 $engine2->{'info'} = {};
 450         }
 451
 452         $engine->{'info'} = {};
 453         $last_move = time;
 454
 455         schedule_tb_lookup();
 456
 457         #
 458         # Output a command every move to note that we're
 459         # still paying attention -- this is a good tradeoff,
 460         # since if no move has happened in the last half
 461         # hour, the analysis/relay has most likely stopped
 462         # and we should stop hogging server resources.
 463         #
 464         if (defined($t)) {
 465                 $t->cmd("date");
 466         }
 467 }
 468
 469 sub parse_infos {
 470         my ($engine, @x) = @_;
 471         my $mpv = '';
 472
 473         my $info = $engine->{'info'};
 474
 475         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 476         for my $i (0..$#x - 1) {
 477                 if ($x[$i] eq 'multipv') {
 478                         $mpv = $x[$i + 1];
 479                         next;
 480                 }
 481         }
 482
 483         my $prev_depth = $info->{'depth1'} // $info->{'depth'};
 484
 485         while (scalar @x > 0) {
 486                 if ($x[0] eq 'multipv') {
 487                         # Dealt with above
 488                         shift @x;
 489                         shift @x;
 490                         next;
 491                 }
 492                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 493                         my $key = shift @x;
 494                         my $value = shift @x;
 495                         $info->{$key} = $value;
 496                         next;
 497                 }
 498                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 499                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 500                     $x[0] eq 'tbhits') {
 501                         my $key = shift @x;
 502                         my $value = shift @x;
 503                         $info->{$key . $mpv} = $value;
 504                         next;
 505                 }
 506                 if ($x[0] eq 'score') {
 507                         shift @x;
 508
 509                         delete $info->{'score_cp' . $mpv};
 510                         delete $info->{'score_mate' . $mpv};
 511                         delete $info->{'splicepos' . $mpv};
 512
 513                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 514                                 if ($x[0] eq 'cp') {
 515                                         shift @x;
 516                                         $info->{'score_cp' . $mpv} = shift @x;
 517                                 } elsif ($x[0] eq 'mate') {
 518                                         shift @x;
 519                                         $info->{'score_mate' . $mpv} = shift @x;
 520                                 } else {
 521                                         shift @x;
 522                                 }
 523                         }
 524                         next;
 525                 }
 526                 if ($x[0] eq 'pv') {
 527                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 528                         last;
 529                 }
 530                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 531                         last;
 532                 }
 533
 534                 #print "unknown info '$x[0]', trying to recover...\n";
 535                 #shift @x;
 536                 die "Unknown info '" . join(',', @x) . "'";
 537
 538         }
 539
 540         my $now_depth = $info->{'depth1'} // $info->{'depth'};
 541         if (defined($prev_depth) && POSIX::floor($now_depth / 10) > POSIX::floor($prev_depth / 10)) {
 542                 my $d = POSIX::floor($now_depth / 10) * 10;  # In case we skipped some.
 543                 complete_using_tbprobe($pos_calculating, $info, exists($info->{'depth1'}) ? '1' : '');
 544                 my $cp = $info->{'score_cp1'} // $info->{'score_cp'};
 545                 my $mate = $info->{'score_mate1'} // $info->{'score_mate'};
 546                 my $splicepos = $info->{'splicepos1'} // $info->{'splicepos'};
 547                 my $bestmove;
 548                 if (defined($info->{'pv1'})) {  # Avoid autovivification.
 549                         $bestmove = $info->{'pv1'}[0];
 550                 } else {
 551                         $bestmove = $info->{'pv'}[0];
 552                 }
 553                 push @{$info->{'lowdepth'}}, [ $d, $cp, $mate, $splicepos, $bestmove ];
 554         }
 555 }
 556
 557 sub parse_ids {
 558         my ($engine, @x) = @_;
 559
 560         while (scalar @x > 0) {
 561                 if ($x[0] eq 'name') {
 562                         my $value = join(' ', @x);
 563                         $engine->{'id'}{'author'} = $value;
 564                         last;
 565                 }
 566
 567                 # unknown
 568                 shift @x;
 569         }
 570 }
 571
 572 sub prettyprint_pv_no_cache {
 573         my ($board, @pvs) = @_;
 574
 575         if (scalar @pvs == 0 || !defined($pvs[0])) {
 576                 return ();
 577         }
 578
 579         my @ret = ();
 580         for my $pv (@pvs) {
 581                 my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($pv);
 582                 my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 583                 push @ret, $pretty;
 584                 $board = $nb;
 585         }
 586         return @ret;
 587 }
 588
 589 sub prettyprint_pv {
 590         my ($pos, @pvs) = @_;
 591
 592         my $cachekey = join('', @pvs);
 593         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 594                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 595         } else {
 596                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 597                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 598                 return @res;
 599         }
 600 }
 601
 602 my %tbprobe_cache = ();
 603
 604 sub complete_using_tbprobe {
 605         my ($pos, $info, $mpv) = @_;
 606
 607         # We need Fathom installed to do standalone TB probes.
 608         return if (!defined($remoteglotconf::fathom_cmdline));
 609
 610         # If we already have a mate, don't bother; in some cases, it would even be
 611         # better than a tablebase score.
 612         return if defined($info->{'score_mate' . $mpv});
 613
 614         # If we have a draw or near-draw score, there's also not much interesting
 615         # we could add from a tablebase. We only really want mates.
 616         return if ($info->{'score_cp' . $mpv} >= -12250 && $info->{'score_cp' . $mpv} <= 12250);
 617
 618         # Run through the PV until we are at a 6-man position.
 619         # TODO: We could in theory only have 5-man data.
 620         my @pv = @{$info->{'pv' . $mpv}};
 621         my $key = $pos->fen() . " " . join('', @pv);
 622         my @moves = ();
 623         my $splicepos;
 624         if (exists($tbprobe_cache{$key})) {
 625                 my $c = $tbprobe_cache{$key};
 626                 @moves = @{$c->{'moves'}};
 627                 $splicepos = $c->{'splicepos'};
 628         } else {
 629                 if ($mpv ne '') {
 630                         # Force doing at least one move of the PV.
 631                         my $move = shift @pv;
 632                         push @moves, $move;
 633                         $pos = $pos->make_move(parse_uci_move($move));
 634                 }
 635
 636                 while ($pos->num_pieces() > 7 && $#pv > -1) {
 637                         my $move = shift @pv;
 638                         push @moves, $move;
 639                         $pos = $pos->make_move(parse_uci_move($move));
 640                 }
 641
 642                 return if ($pos->num_pieces() > 7);
 643
 644                 my $fen = $pos->fen();
 645                 my $pgn_text = `$remoteglotconf::fathom_cmdline "$fen"`;
 646                 my $pgn = Chess::PGN::Parse->new(undef, $pgn_text);
 647                 return if (!defined($pgn) || !$pgn->read_game() || ($pgn->result ne '0-1' && $pgn->result ne '1-0'));
 648                 $pgn->quick_parse_game;
 649
 650                 # Splice the PV from the tablebase onto what we have so far.
 651                 $splicepos = scalar @moves;
 652                 for my $move (@{$pgn->moves}) {
 653                         last if $move eq '#';
 654                         last if $move eq '1-0';
 655                         last if $move eq '0-1';
 656                         last if $move eq '1/2-1/2';
 657                         my $uci_move;
 658                         ($pos, $uci_move) = $pos->make_pretty_move($move);
 659                         push @moves, $uci_move;
 660                 }
 661
 662                 $tbprobe_cache{$key} = {
 663                         moves => \@moves,
 664                         splicepos => $splicepos
 665                 };
 666         }
 667
 668         $info->{'pv' . $mpv} = \@moves;
 669
 670         my $matelen = int((1 + scalar @moves) / 2);
 671         if ((scalar @moves) % 2 == 0) {
 672                 $info->{'score_mate' . $mpv} = -$matelen;
 673         } else {
 674                 $info->{'score_mate' . $mpv} = $matelen;
 675         }
 676         $info->{'splicepos' . $mpv} = $splicepos;
 677 }
 678
 679 sub output {
 680         #return;
 681
 682         return if (!defined($pos_calculating));
 683
 684         my $info = $engine->{'info'};
 685
 686         # Don't update too often.
 687         my $wait = $remoteglotconf::update_max_interval - Time::HiRes::tv_interval($latest_update);
 688         if (defined($pos_calculating_started)) {
 689                 my $new_pos_wait = $remoteglotconf::update_force_after_move - Time::HiRes::tv_interval($pos_calculating_started);
 690                 $wait = $new_pos_wait if ($new_pos_wait < $wait);
 691         }
 692         if (!$last_output_had_pv && has_pv($info)) {
 693                 if (!defined($pos_pv_started)) {
 694                         $pos_pv_started = [Time::HiRes::gettimeofday];
 695                 }
 696                 # We just got initial PV, and we're in a hurry since we gave out a blank one earlier,
 697                 # so give us just 200ms more to increase the quality and then force a display.
 698                 my $new_pos_wait = $remoteglotconf::update_force_after_move - Time::HiRes::tv_interval($pos_pv_started);
 699                 $wait = $new_pos_wait if ($new_pos_wait < $wait);
 700         }
 701         if ($wait > 0.0) {
 702                 $output_timer = AnyEvent->timer(after => $wait + 0.01, cb => \&output);
 703                 return;
 704         }
 705         $pos_pv_started = undef;
 706
 707         # We're outputting something for this position now, so the special handling
 708         # for new positions is off.
 709         undef $pos_calculating_started;
 710
 711         #
 712         # If we have tablebase data from a previous lookup, replace the
 713         # engine data with the data from the tablebase.
 714         #
 715         my $fen = $pos_calculating->fen();
 716         if (exists($tb_cache{$fen})) {
 717                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits splicepos)) {
 718                         delete $info->{$key . '1'};
 719                         delete $info->{$key};
 720                 }
 721                 $info->{'nodes'} = 0;
 722                 $info->{'nps'} = 0;
 723                 $info->{'depth'} = 0;
 724                 $info->{'seldepth'} = 0;
 725                 $info->{'tbhits'} = 0;
 726
 727                 my $t = $tb_cache{$fen};
 728                 my $pv = $t->{'pv'};
 729                 my $matelen = int((1 + $t->{'score'}) / 2);
 730                 if ($t->{'result'} eq '1/2-1/2') {
 731                         $info->{'score_cp'} = 0;
 732                 } elsif ($t->{'result'} eq '1-0') {
 733                         if ($pos_calculating->{'toplay'} eq 'B') {
 734                                 $info->{'score_mate'} = -$matelen;
 735                         } else {
 736                                 $info->{'score_mate'} = $matelen;
 737                         }
 738                 } else {
 739                         if ($pos_calculating->{'toplay'} eq 'B') {
 740                                 $info->{'score_mate'} = $matelen;
 741                         } else {
 742                                 $info->{'score_mate'} = -$matelen;
 743                         }
 744                 }
 745                 $info->{'pv'} = $pv;
 746                 $info->{'tablebase'} = 1;
 747         } else {
 748                 $info->{'tablebase'} = 0;
 749         }
 750
 751         #
 752         # Some programs _always_ report MultiPV, even with only one PV.
 753         # In this case, we simply use that data as if MultiPV was never
 754         # specified.
 755         #
 756         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 757                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits splicepos)) {
 758                         if (exists($info->{$key . '1'})) {
 759                                 $info->{$key} = $info->{$key . '1'};
 760                         } else {
 761                                 delete $info->{$key};
 762                         }
 763                 }
 764         }
 765
 766         #
 767         # Check the PVs first. if they're invalid, just wait, as our data
 768         # is most likely out of sync. This isn't a very good solution, as
 769         # it can frequently miss stuff, but it's good enough for most users.
 770         #
 771         eval {
 772                 my $dummy;
 773                 if (exists($info->{'pv'})) {
 774                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 775                 }
 776
 777                 my $mpv = 1;
 778                 while (exists($info->{'pv' . $mpv})) {
 779                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 780                         ++$mpv;
 781                 }
 782         };
 783         if ($@) {
 784                 $engine->{'info'} = {};
 785                 return;
 786         }
 787
 788         # Now do our own Syzygy tablebase probes to convert scores like +123.45 to mate.
 789         if (exists($info->{'pv'})) {
 790                 complete_using_tbprobe($pos_calculating, $info, '');
 791         }
 792
 793         my $mpv = 1;
 794         while (exists($info->{'pv' . $mpv})) {
 795                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 796                 ++$mpv;
 797         }
 798
 799         output_screen();
 800         output_json(0);
 801         $latest_update = [Time::HiRes::gettimeofday];
 802         $last_output_had_pv = has_pv($info);
 803 }
 804
 805 sub has_pv {
 806         my $info = shift;
 807         return 1 if (exists($info->{'pv'}) && (scalar(@{$info->{'pv'}}) > 0));
 808         return 1 if (exists($info->{'pv1'}) && (scalar(@{$info->{'pv1'}}) > 0));
 809         return 0;
 810 }
 811
 812 sub output_screen {
 813         my $info = $engine->{'info'};
 814         my $id = $engine->{'id'};
 815
 816         my $text = 'Analysis';
 817         if ($pos_calculating->{'last_move'} ne 'none') {
 818                 if ($pos_calculating->{'toplay'} eq 'W') {
 819                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 820                 } else {
 821                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 822                 }
 823                 if (exists($id->{'name'})) {
 824                         $text .= ',';
 825                 }
 826         }
 827
 828         if (exists($id->{'name'})) {
 829                 $text .= " by $id->{'name'}:\n\n";
 830         } else {
 831                 $text .= ":\n\n";
 832         }
 833
 834         return unless (exists($pos_calculating->{'board'}));
 835
 836         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 837                 # multi-PV
 838                 my $mpv = 1;
 839                 while (exists($info->{'pv' . $mpv})) {
 840                         $text .= sprintf "  PV%2u", $mpv;
 841                         my $score = short_score($info, $pos_calculating, $mpv);
 842                         $text .= "  ($score)" if (defined($score));
 843
 844                         my $tbhits = '';
 845                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 846                                 if ($info->{'tbhits' . $mpv} == 1) {
 847                                         $tbhits = ", 1 tbhit";
 848                                 } else {
 849                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 850                                 }
 851                         }
 852
 853                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 854                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 855                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 856                         }
 857
 858                         $text .= ":\n";
 859                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 860                         $text .= "\n";
 861                         ++$mpv;
 862                 }
 863         } else {
 864                 # single-PV
 865                 my $score = long_score($info, $pos_calculating, '');
 866                 $text .= "  $score\n" if defined($score);
 867                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 868                 $text .=  "\n";
 869
 870                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 871                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 872                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 873                 }
 874                 if (exists($info->{'seldepth'})) {
 875                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 876                 }
 877                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 878                         if ($info->{'tbhits'} == 1) {
 879                                 $text .= ", one Syzygy hit";
 880                         } else {
 881                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 882                         }
 883                 }
 884                 $text .= "\n\n";
 885         }
 886
 887         my @refutation_lines = ();
 888         if (defined($engine2)) {
 889                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 890                         my $info = $engine2->{'info'};
 891                         last if (!exists($info->{'pv' . $mpv}));
 892                         eval {
 893                                 complete_using_tbprobe($pos_calculating_second_engine, $info, $mpv);
 894                                 my $pv = $info->{'pv' . $mpv};
 895                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 896                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 897                                 if (scalar @pretty_pv > 5) {
 898                                         @pretty_pv = @pretty_pv[0..4];
 899                                         push @pretty_pv, "...";
 900                                 }
 901                                 my $key = $pretty_move;
 902                                 my $line = sprintf("  %-6s %6s %3s  %s",
 903                                         $pretty_move,
 904                                         short_score($info, $pos_calculating_second_engine, $mpv),
 905                                         "d" . $info->{'depth' . $mpv},
 906                                         join(', ', @pretty_pv));
 907                                 push @refutation_lines, [ $key, $line ];
 908                         };
 909                 }
 910         }
 911
 912         if ($#refutation_lines >= 0) {
 913                 $text .= "Shallow search of all legal moves:\n\n";
 914                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 915                         $text .= $line->[1] . "\n";
 916                 }
 917                 $text .= "\n\n";
 918         }
 919
 920         if ($last_text ne $text) {
 921                 print "\e[H\e[2J"; # clear the screen
 922                 print $text;
 923                 $last_text = $text;
 924         }
 925 }
 926
 927 sub output_json {
 928         my $historic_json_only = shift;
 929         my $info = $engine->{'info'};
 930
 931         my $json = {};
 932         $json->{'position'} = $pos_calculating->to_json_hash();
 933         $json->{'engine'} = $engine->{'id'};
 934         if (defined($remoteglotconf::engine_url)) {
 935                 $json->{'engine'}{'url'} = $remoteglotconf::engine_url;
 936         }
 937         if (defined($remoteglotconf::engine_details)) {
 938                 $json->{'engine'}{'details'} = $remoteglotconf::engine_details;
 939         }
 940         my @grpc_backends = ();
 941         if (defined($remoteglotconf::engine_grpc_backend)) {
 942                 push @grpc_backends, $remoteglotconf::engine_grpc_backend;
 943         }
 944         if (defined($remoteglotconf::engine2_grpc_backend)) {
 945                 push @grpc_backends, $remoteglotconf::engine2_grpc_backend;
 946         }
 947         $json->{'internal'}{'grpc_backends'} = \@grpc_backends;
 948         if (defined($remoteglotconf::move_source)) {
 949                 $json->{'move_source'} = $remoteglotconf::move_source;
 950         }
 951         if (defined($remoteglotconf::move_source_url)) {
 952                 $json->{'move_source_url'} = $remoteglotconf::move_source_url;
 953         }
 954         $json->{'score'} = score_digest($info, $pos_calculating, '');
 955         $json->{'using_lomonosov'} = defined($remoteglotconf::tb_serial_key);
 956
 957         $json->{'nodes'} = $info->{'nodes'};
 958         $json->{'nps'} = $info->{'nps'};
 959         $json->{'depth'} = $info->{'depth'};
 960         $json->{'tbhits'} = $info->{'tbhits'};
 961         $json->{'seldepth'} = $info->{'seldepth'};
 962         $json->{'tablebase'} = $info->{'tablebase'};
 963         $json->{'pv'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 964
 965         $json->{'lowdepth'} = {};
 966         if (exists($info->{'lowdepth'})) {
 967                 for my $ld (@{$info->{'lowdepth'}}) {
 968                         my $score = score_digest_inner($ld->[1], $ld->[2], $ld->[3], 0, $pos_calculating);
 969                         push @$score, prettyprint_pv($pos_calculating, $ld->[4]);
 970                         $json->{'lowdepth'}{$ld->[0]} = $score;
 971                 }
 972         }
 973
 974         my %refutation_lines = ();
 975         my @refutation_lines = ();
 976         if (defined($engine2)) {
 977                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 978                         my $info = $engine2->{'info'};
 979                         my $pretty_move = "";
 980                         my @pretty_pv = ();
 981                         last if (!exists($info->{'pv' . $mpv}));
 982
 983                         eval {
 984                                 complete_using_tbprobe($pos_calculating, $info, $mpv);
 985                                 my $pv = $info->{'pv' . $mpv};
 986                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 987                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 988                                 $refutation_lines{$pretty_move} = {
 989                                         depth => $info->{'depth' . $mpv},
 990                                         score => score_digest($info, $pos_calculating, $mpv),
 991                                         move => $pretty_move,
 992                                         pv => \@pretty_pv,
 993                                 };
 994                                 if (exists($info->{'splicepos' . $mpv})) {
 995                                         $refutation_lines{$pretty_move}->{'splicepos'} = $info->{'splicepos' . $mpv};
 996                                 }
 997                         };
 998                 }
 999         }
1000         $json->{'refutation_lines'} = \%refutation_lines;
1001
1002         # Piece together historic score information, to the degree we have it.
1003         if (!$historic_json_only && exists($pos_calculating->{'history'})) {
1004                 my %score_history = ();
1005
1006                 local $dbh->{AutoCommit} = 0;
1007                 my $q = $dbh->prepare('SELECT * FROM scores WHERE id=?');
1008                 my $pos;
1009                 if (exists($pos_calculating->{'start_fen'})) {
1010                         $pos = Position->from_fen($pos_calculating->{'start_fen'});
1011                 } else {
1012                         $pos = Position->start_pos('white', 'black');
1013                 }
1014                 $pos->{'chess960'} = $pos_calculating->{'chess960'};
1015                 my $halfmove_num = 0;
1016                 for my $move (@{$pos_calculating->{'history'}}) {
1017                         my $id = id_for_pos($pos, $halfmove_num);
1018                         my $ref = $dbh->selectrow_hashref($q, undef, $id);
1019                         if (defined($ref)) {
1020                                 $score_history{$halfmove_num} = [
1021                                         $ref->{'score_type'},
1022                                         $ref->{'score_value'}
1023                                 ];
1024                         }
1025                         ++$halfmove_num;
1026                         ($pos) = $pos->make_pretty_move($move);
1027                 }
1028                 $q->finish;
1029                 $dbh->commit;
1030
1031                 # If at any point we are missing 10 consecutive moves,
1032                 # truncate the history there. This is so we don't get into
1033                 # a situation where we e.g. start analyzing at move 45,
1034                 # but we have analysis for 1. e4 from some completely different game
1035                 # and thus show a huge hole.
1036                 my $consecutive_missing = 0;
1037                 my $truncate_until = 0;
1038                 for (my $i = $halfmove_num; $i --> 0; ) {
1039                         if ($consecutive_missing >= 10) {
1040                                 delete $score_history{$i};
1041                                 next;
1042                         }
1043                         if (exists($score_history{$i})) {
1044                                 $consecutive_missing = 0;
1045                         } else {
1046                                 ++$consecutive_missing;
1047                         }
1048                 }
1049
1050                 $json->{'score_history'} = \%score_history;
1051         }
1052
1053         # Give out a list of other games going on. (Empty is fine.)
1054         # TODO: Don't bother reading our own file, the data will be stale anyway.
1055         if (!$historic_json_only) {
1056                 my @games = ();
1057
1058                 my $q = $dbh->prepare('SELECT * FROM current_games ORDER BY priority DESC, id');
1059                 $q->execute;
1060                 while (my $ref = $q->fetchrow_hashref) {
1061                         eval {
1062                                 my $other_game_contents = File::Slurp::read_file($ref->{'json_path'});
1063                                 my $other_game_json = JSON::XS::decode_json($other_game_contents);
1064
1065                                 die "Missing position" if (!exists($other_game_json->{'position'}));
1066                                 my $white = $other_game_json->{'position'}{'player_w'} // die 'Missing white';
1067                                 my $black = $other_game_json->{'position'}{'player_b'} // die 'Missing black';
1068
1069                                 my $game = {
1070                                         id => $ref->{'id'},
1071                                         name => "$white–$black",
1072                                         url => $ref->{'url'},
1073                                         hashurl => $ref->{'hash_url'},
1074                                 };
1075                                 if (defined($other_game_json->{'position'}{'result'})) {
1076                                         $game->{'result'} = $other_game_json->{'position'}{'result'};
1077                                 } else {
1078                                         $game->{'score'} = $other_game_json->{'score'};
1079                                 }
1080                                 push @games, $game;
1081                         };
1082                         if ($@) {
1083                                 warn "Could not add external game " . $ref->{'json_path'} . ": $@";
1084                         }
1085                 }
1086
1087                 if (scalar @games > 0) {
1088                         $json->{'games'} = \@games;
1089                 }
1090         }
1091
1092         my $json_enc = JSON::XS->new;
1093         $json_enc->canonical(1);
1094         my $encoded = $json_enc->encode($json);
1095         unless ($historic_json_only || !defined($remoteglotconf::json_output) ||
1096                 (defined($last_written_json) && $last_written_json eq $encoded)) {
1097                 atomic_set_contents($remoteglotconf::json_output, $encoded);
1098                 $last_written_json = $encoded;
1099         }
1100
1101         if (exists($pos_calculating->{'history'}) &&
1102             defined($remoteglotconf::json_history_dir)) {
1103                 my $id = id_for_pos($pos_calculating);
1104                 my $filename = $remoteglotconf::json_history_dir . "/" . $id . ".json";
1105
1106                 # Overwrite old analysis (assuming it exists at all) if we're
1107                 # using a different engine, or if we've calculated deeper.
1108                 # nodes is used as a tiebreaker. Don't bother about Multi-PV
1109                 # data; it's not that important.
1110                 my ($old_engine, $old_depth, $old_nodes) = get_json_analysis_stats($id);
1111                 my $new_depth = $json->{'depth'} // 0;
1112                 my $new_nodes = $json->{'nodes'} // 0;
1113                 if (!defined($old_engine) ||
1114                     $old_engine ne $json->{'engine'}{'name'} ||
1115                     $new_depth > $old_depth ||
1116                     ($new_depth == $old_depth && $new_nodes >= $old_nodes)) {
1117                         atomic_set_contents($filename, $encoded);
1118                         if (defined($json->{'score'})) {
1119                                 $dbh->do('INSERT INTO scores (id, score_type, score_value, engine, depth, nodes) VALUES (?,?,?,?,?,?) ' .
1120                                          '    ON CONFLICT (id) DO UPDATE SET ' .
1121                                          '        score_type=EXCLUDED.score_type, ' .
1122                                          '        score_value=EXCLUDED.score_value, ' .
1123                                          '        engine=EXCLUDED.engine, ' .
1124                                          '        depth=EXCLUDED.depth, ' .
1125                                          '        nodes=EXCLUDED.nodes',
1126                                         undef,
1127                                         $id, $json->{'score'}[0], $json->{'score'}[1],
1128                                         $json->{'engine'}{'name'}, $new_depth, $new_nodes);
1129                         }
1130                 }
1131         }
1132 }
1133
1134 sub atomic_set_contents {
1135         my ($filename, $contents) = @_;
1136
1137         open my $fh, ">", $filename . ".tmp"
1138                 or return;
1139         print $fh $contents;
1140         close $fh;
1141         rename($filename . ".tmp", $filename);
1142 }
1143
1144 sub id_for_pos {
1145         my ($pos, $halfmove_num) = @_;
1146
1147         $halfmove_num //= scalar @{$pos->{'history'}};
1148         (my $fen = $pos->fen()) =~ tr,/ ,-_,;
1149         return "move$halfmove_num-$fen";
1150 }
1151
1152 sub get_json_analysis_stats {
1153         my $id = shift;
1154         my $ref = $dbh->selectrow_hashref('SELECT * FROM scores WHERE id=?', undef, $id);
1155         if (defined($ref)) {
1156                 return ($ref->{'engine'}, $ref->{'depth'}, $ref->{'nodes'});
1157         } else {
1158                 return ('', 0, 0);
1159         }
1160 }
1161
1162 sub uciprint {
1163         my ($engine, $msg) = @_;
1164         $engine->print($msg);
1165         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
1166 }
1167
1168 sub short_score {
1169         my ($info, $pos, $mpv) = @_;
1170
1171         my $invert = ($pos->{'toplay'} eq 'B');
1172         if (defined($info->{'score_mate' . $mpv})) {
1173                 if ($invert) {
1174                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
1175                 } else {
1176                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
1177                 }
1178         } else {
1179                 if (exists($info->{'score_cp' . $mpv})) {
1180                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1181                         if ($score == 0) {
1182                                 if ($info->{'tablebase'}) {
1183                                         return "TB draw";
1184                                 } else {
1185                                         return " 0.00";
1186                                 }
1187                         }
1188                         if ($invert) {
1189                                 $score = -$score;
1190                         }
1191                         return sprintf "%+5.2f", $score;
1192                 }
1193         }
1194
1195         return undef;
1196 }
1197
1198 # Sufficient for computing long_score, short_score, plot_score and
1199 # (with side-to-play information) score_sort_key.
1200 sub score_digest {
1201         my ($info, $pos, $mpv) = @_;
1202         return score_digest_inner(
1203                 $info->{'score_cp' . $mpv},
1204                 $info->{'score_mate' . $mpv},
1205                 $info->{'splicepos' . $mpv},
1206                 $info->{'tablebase'},
1207                 $pos);
1208 }
1209
1210 sub score_digest_inner {
1211         my ($score, $mate, $sp, $tablebase, $pos) = @_;
1212         if (defined($mate)) {
1213                 if ($pos->{'toplay'} eq 'B') {
1214                         $mate = -$mate;
1215                 }
1216                 if (defined($sp)) {
1217                         if ($mate > 0) {
1218                                 return ['T', $sp];
1219                         } else {
1220                                 return ['t', $sp];
1221                         }
1222                 } else {
1223                         if ($mate > 0) {
1224                                 return ['M', $mate];
1225                         } elsif ($mate < 0) {
1226                                 return ['m', -$mate];
1227                         } elsif ($pos->{'toplay'} eq 'B') {
1228                                 return ['M', 0];
1229                         } else {
1230                                 return ['m', 0];
1231                         }
1232                 }
1233         } else {
1234                 if (defined($score)) {
1235                         if ($pos->{'toplay'} eq 'B') {
1236                                 $score = -$score;
1237                         }
1238                         if ($score == 0 && $tablebase) {
1239                                 return ['d', undef];
1240                         } else {
1241                                 return ['cp', int($score)];
1242                         }
1243                 }
1244         }
1245
1246         return undef;
1247 }
1248
1249 sub long_score {
1250         my ($info, $pos, $mpv) = @_;
1251
1252         if (defined($info->{'score_mate' . $mpv})) {
1253                 my $mate = $info->{'score_mate' . $mpv};
1254                 if ($pos->{'toplay'} eq 'B') {
1255                         $mate = -$mate;
1256                 }
1257                 if (exists($info->{'splicepos' . $mpv})) {
1258                         my $sp = $info->{'splicepos' . $mpv};
1259                         if ($mate > 0) {
1260                                 return sprintf "White wins in %u", int(($sp + 1) * 0.5);
1261                         } else {
1262                                 return sprintf "Black wins in %u", int(($sp + 1) * 0.5);
1263                         }
1264                 } else {
1265                         if ($mate > 0) {
1266                                 return sprintf "White mates in %u", $mate;
1267                         } else {
1268                                 return sprintf "Black mates in %u", -$mate;
1269                         }
1270                 }
1271         } else {
1272                 if (exists($info->{'score_cp' . $mpv})) {
1273                         my $score = $info->{'score_cp' . $mpv} * 0.01;
1274                         if ($score == 0) {
1275                                 if ($info->{'tablebase'}) {
1276                                         return "Theoretical draw";
1277                                 } else {
1278                                         return "Score:  0.00";
1279                                 }
1280                         }
1281                         if ($pos->{'toplay'} eq 'B') {
1282                                 $score = -$score;
1283                         }
1284                         return sprintf "Score: %+5.2f", $score;
1285                 }
1286         }
1287
1288         return undef;
1289 }
1290
1291 # For graphs; a single number in centipawns, capped at +/- 500.
1292 sub plot_score {
1293         my ($info, $pos, $mpv) = @_;
1294
1295         my $invert = ($pos->{'toplay'} eq 'B');
1296         if (defined($info->{'score_mate' . $mpv})) {
1297                 my $mate = $info->{'score_mate' . $mpv};
1298                 if ($invert) {
1299                         $mate = -$mate;
1300                 }
1301                 if ($mate > 0) {
1302                         return 500;
1303                 } else {
1304                         return -500;
1305                 }
1306         } else {
1307                 if (exists($info->{'score_cp' . $mpv})) {
1308                         my $score = $info->{'score_cp' . $mpv};
1309                         if ($invert) {
1310                                 $score = -$score;
1311                         }
1312                         $score = 500 if ($score > 500);
1313                         $score = -500 if ($score < -500);
1314                         return int($score);
1315                 }
1316         }
1317
1318         return undef;
1319 }
1320
1321 sub extract_clock {
1322         my ($pgn, $pos) = @_;
1323
1324         # Look for extended PGN clock tags.
1325         my $tags = $pgn->tags;
1326         if (exists($tags->{'WhiteClock'}) && exists($tags->{'BlackClock'})) {
1327                 $pos->{'white_clock'} = hms_to_sec($tags->{'WhiteClock'});
1328                 $pos->{'black_clock'} = hms_to_sec($tags->{'BlackClock'});
1329                 return;
1330         }
1331
1332         # Look for TCEC-style time comments.
1333         my $moves = $pgn->moves;
1334         my $comments = $pgn->comments;
1335         my $last_black_move = int((scalar @$moves) / 2);
1336         my $last_white_move = int((1 + scalar @$moves) / 2);
1337
1338         my $black_key = $last_black_move . "b";
1339         my $white_key = $last_white_move . "w";
1340
1341         if (exists($comments->{$white_key}) &&
1342             exists($comments->{$black_key}) &&
1343             $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/ &&
1344             $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/) {
1345                 $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1346                 $pos->{'white_clock'} = hms_to_sec($1);
1347                 $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
1348                 $pos->{'black_clock'} = hms_to_sec($1);
1349                 return;
1350         }
1351
1352         delete $pos->{'white_clock'};
1353         delete $pos->{'black_clock'};
1354 }
1355
1356 sub hms_to_sec {
1357         my $hms = shift;
1358         return undef if (!defined($hms));
1359         $hms =~ /(\d+):(\d+):(\d+)/;
1360         return $1 * 3600 + $2 * 60 + $3;
1361 }
1362
1363 sub find_clock_start {
1364         my ($pos, $prev_pos) = @_;
1365
1366         # If the game is over, the clock is stopped.
1367         if (exists($pos->{'result'}) &&
1368             ($pos->{'result'} eq '1-0' ||
1369              $pos->{'result'} eq '1/2-1/2' ||
1370              $pos->{'result'} eq '0-1')) {
1371                 return;
1372         }
1373
1374         # When we don't have any moves, we assume the clock hasn't started yet.
1375         if ($pos->{'move_num'} == 1 && $pos->{'toplay'} eq 'W') {
1376                 if (defined($remoteglotconf::adjust_clocks_before_move)) {
1377                         &$remoteglotconf::adjust_clocks_before_move(\$pos->{'white_clock'}, \$pos->{'black_clock'}, 1, 'W');
1378                 }
1379                 return;
1380         }
1381
1382         # TODO(sesse): Maybe we can get the number of moves somehow else for FICS games.
1383         # The history is needed for id_for_pos.
1384         if (!exists($pos->{'history'})) {
1385                 return;
1386         }
1387
1388         my $id = id_for_pos($pos);
1389         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, $id);
1390         if (defined($clock_info)) {
1391                 $pos->{'white_clock'} //= $clock_info->{'white_clock'};
1392                 $pos->{'black_clock'} //= $clock_info->{'black_clock'};
1393                 if ($pos->{'toplay'} eq 'W') {
1394                         $pos->{'white_clock_target'} = $clock_info->{'white_clock_target'};
1395                 } else {
1396                         $pos->{'black_clock_target'} = $clock_info->{'black_clock_target'};
1397                 }
1398                 return;
1399         }
1400
1401         # OK, we haven't seen this position before, so we assume the move
1402         # happened right now.
1403
1404         # See if we should do our own clock management (ie., clock information
1405         # is spurious or non-existent).
1406         if (defined($remoteglotconf::adjust_clocks_before_move)) {
1407                 my $wc = $pos->{'white_clock'} // $prev_pos->{'white_clock'};
1408                 my $bc = $pos->{'black_clock'} // $prev_pos->{'black_clock'};
1409                 if (defined($prev_pos->{'white_clock_target'})) {
1410                         $wc = $prev_pos->{'white_clock_target'} - time;
1411                 }
1412                 if (defined($prev_pos->{'black_clock_target'})) {
1413                         $bc = $prev_pos->{'black_clock_target'} - time;
1414                 }
1415                 &$remoteglotconf::adjust_clocks_before_move(\$wc, \$bc, $pos->{'move_num'}, $pos->{'toplay'});
1416                 $pos->{'white_clock'} = $wc;
1417                 $pos->{'black_clock'} = $bc;
1418         }
1419
1420         my $key = ($pos->{'toplay'} eq 'W') ? 'white_clock' : 'black_clock';
1421         if (!exists($pos->{$key})) {
1422                 # No clock information.
1423                 return;
1424         }
1425         my $time_left = $pos->{$key};
1426         my ($white_clock_target, $black_clock_target);
1427         if ($pos->{'toplay'} eq 'W') {
1428                 $white_clock_target = $pos->{'white_clock_target'} = time + $time_left;
1429         } else {
1430                 $black_clock_target = $pos->{'black_clock_target'} = time + $time_left;
1431         }
1432         local $dbh->{AutoCommit} = 0;
1433         $dbh->do('DELETE FROM clock_info WHERE id=?', undef, $id);
1434         $dbh->do('INSERT INTO clock_info (id, white_clock, black_clock, white_clock_target, black_clock_target) VALUES (?, ?, ?, ?, ?)', undef,
1435                 $id, $pos->{'white_clock'}, $pos->{'black_clock'}, $white_clock_target, $black_clock_target);
1436         $dbh->commit;
1437 }
1438
1439 sub schedule_tb_lookup {
1440         return if (!defined($remoteglotconf::tb_serial_key));
1441         my $pos = $pos_calculating;
1442         return if (exists($tb_cache{$pos->fen()}));
1443
1444         # If there's more than seven pieces, there's not going to be an answer,
1445         # so don't bother.
1446         return if ($pos->num_pieces() > 7);
1447
1448         # Max one at a time. If it's still relevant when it returns,
1449         # schedule_tb_lookup() will be called again.
1450         return if ($tb_lookup_running);
1451
1452         $tb_lookup_running = 1;
1453         my $url = 'http://tb7-api.chessok.com:6904/tasks/addtask?auth.login=' .
1454                 $remoteglotconf::tb_serial_key .
1455                 '&auth.password=aquarium&type=0&fen=' .
1456                 URI::Escape::uri_escape($pos->fen());
1457         print TBLOG "Downloading $url...\n";
1458         AnyEvent::HTTP::http_get($url, sub {
1459                 handle_tb_lookup_return(@_, $pos, $pos->fen());
1460         });
1461 }
1462
1463 sub handle_tb_lookup_return {
1464         my ($body, $header, $pos, $fen) = @_;
1465         print TBLOG "Response for [$fen]:\n";
1466         print TBLOG $header . "\n\n";
1467         print TBLOG $body . "\n\n";
1468         eval {
1469                 my $response = JSON::XS::decode_json($body);
1470                 if ($response->{'ErrorCode'} != 0) {
1471                         die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
1472                 }
1473                 my $state = $response->{'Response'}{'StateString'};
1474                 if ($state eq 'COMPLETE') {
1475                         my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
1476                         if (!defined($pgn) || !$pgn->read_game()) {
1477                                 warn "Error in parsing PGN\n";
1478                         } else {
1479                                 $pgn->quick_parse_game;
1480                                 my $pvpos = $pos;
1481                                 my $moves = $pgn->moves;
1482                                 my @uci_moves = ();
1483                                 for my $move (@$moves) {
1484                                         my $uci_move;
1485                                         ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
1486                                         push @uci_moves, $uci_move;
1487                                 }
1488                                 $tb_cache{$fen} = {
1489                                         result => $pgn->result,
1490                                         pv => \@uci_moves,
1491                                         score => $response->{'Response'}{'Score'},
1492                                 };
1493                                 output();
1494                         }
1495                 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
1496                         # Try again in a second. Note that if we have changed
1497                         # position in the meantime, we might query a completely
1498                         # different position! But that's fine.
1499                 } else {
1500                         die "Unknown response state " . $state;
1501                 }
1502
1503                 # Wait a second before we schedule another one.
1504                 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
1505                         $tb_lookup_running = 0;
1506                         schedule_tb_lookup();
1507                 });
1508         };
1509         if ($@) {
1510                 warn "Error in tablebase lookup: $@";
1511
1512                 # Don't try this one again, but don't block new lookups either.
1513                 $tb_lookup_running = 0;
1514         }
1515 }
1516
1517 sub open_engine {
1518         my ($cmdline, $tag, $cb) = @_;
1519         return undef if (!defined($cmdline));
1520         return Engine->open($cmdline, $tag, $cb);
1521 }
1522
1523 sub col_letter_to_num {
1524         return ord(shift) - ord('a');
1525 }
1526
1527 sub row_letter_to_num {
1528         return 7 - (ord(shift) - ord('1'));
1529 }
1530
1531 sub parse_uci_move {
1532         my $move = shift;
1533         my $from_col = col_letter_to_num(substr($move, 0, 1));
1534         my $from_row = row_letter_to_num(substr($move, 1, 1));
1535         my $to_col   = col_letter_to_num(substr($move, 2, 1));
1536         my $to_row   = row_letter_to_num(substr($move, 3, 1));
1537         my $promo    = substr($move, 4, 1);
1538         return ($from_row, $from_col, $to_row, $to_col, $promo);
1539 }
1540
1541 sub setoptions {
1542         my ($engine, $config) = @_;
1543         uciprint($engine, "setoption name UCI_AnalyseMode value true");
1544         uciprint($engine, "setoption name Analysis Contempt value Off");
1545         if (exists($config->{'Threads'})) {  # Threads first, because clearing hash can be multithreaded then.
1546                 uciprint($engine, "setoption name Threads value " . $config->{'Threads'});
1547         }
1548         while (my ($key, $value) = each %$config) {
1549                 next if $key eq 'Threads';
1550                 uciprint($engine, "setoption name $key value $value");
1551         }
1552 }