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 <sgunderson@bigfoot.com>
   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 FileHandle;
  19 use IPC::Open2;
  20 use Time::HiRes;
  21 use JSON::XS;
  22 use URI::Escape;
  23 require 'Position.pm';
  24 require 'Engine.pm';
  25 require 'config.pm';
  26 use strict;
  27 use warnings;
  28 no warnings qw(once);
  29
  30 # Program starts here
  31 my $latest_update = undef;
  32 my $output_timer = undef;
  33 my $http_timer = undef;
  34 my $stop_pgn_fetch = 0;
  35 my $tb_retry_timer = undef;
  36 my %tb_cache = ();
  37 my $tb_lookup_running = 0;
  38 my $last_written_json = undef;
  39
  40 # TODO: Persist (parts of) this so that we can restart.
  41 my %clock_target_for_pos = ();
  42
  43 $| = 1;
  44
  45 open(FICSLOG, ">ficslog.txt")
  46         or die "ficslog.txt: $!";
  47 print FICSLOG "Log starting.\n";
  48 select(FICSLOG);
  49 $| = 1;
  50
  51 open(UCILOG, ">ucilog.txt")
  52         or die "ucilog.txt: $!";
  53 print UCILOG "Log starting.\n";
  54 select(UCILOG);
  55 $| = 1;
  56
  57 open(TBLOG, ">tblog.txt")
  58         or die "tblog.txt: $!";
  59 print TBLOG "Log starting.\n";
  60 select(TBLOG);
  61 $| = 1;
  62
  63 select(STDOUT);
  64
  65 # open the chess engine
  66 my $engine = open_engine($remoteglotconf::engine_cmdline, 'E1', sub { handle_uci(@_, 1); });
  67 my $engine2 = open_engine($remoteglotconf::engine2_cmdline, 'E2', sub { handle_uci(@_, 0); });
  68 my $last_move;
  69 my $last_text = '';
  70 my ($pos_waiting, $pos_calculating, $pos_calculating_second_engine);
  71
  72 uciprint($engine, "setoption name UCI_AnalyseMode value true");
  73 while (my ($key, $value) = each %remoteglotconf::engine_config) {
  74         uciprint($engine, "setoption name $key value $value");
  75 }
  76 uciprint($engine, "ucinewgame");
  77
  78 if (defined($engine2)) {
  79         uciprint($engine2, "setoption name UCI_AnalyseMode value true");
  80         while (my ($key, $value) = each %remoteglotconf::engine2_config) {
  81                 uciprint($engine2, "setoption name $key value $value");
  82         }
  83         uciprint($engine2, "setoption name MultiPV value 500");
  84         uciprint($engine2, "ucinewgame");
  85 }
  86
  87 print "Chess engine ready.\n";
  88
  89 # now talk to FICS
  90 my $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
  91 $t->input_log(\*FICSLOG);
  92 $t->open($remoteglotconf::server);
  93 $t->print($remoteglotconf::nick);
  94 $t->waitfor('/Press return to enter the server/');
  95 $t->cmd("");
  96
  97 # set some options
  98 $t->cmd("set shout 0");
  99 $t->cmd("set seek 0");
 100 $t->cmd("set style 12");
 101
 102 my $ev1 = AnyEvent->io(
 103         fh => fileno($t),
 104         poll => 'r',
 105         cb => sub {    # what callback to execute
 106                 while (1) {
 107                         my $line = $t->getline(Timeout => 0, errmode => 'return');
 108                         return if (!defined($line));
 109
 110                         chomp $line;
 111                         $line =~ tr/\r//d;
 112                         handle_fics($line);
 113                 }
 114         }
 115 );
 116 if (defined($remoteglotconf::target)) {
 117         if ($remoteglotconf::target =~ /^http:/) {
 118                 fetch_pgn($remoteglotconf::target);
 119         } else {
 120                 $t->cmd("observe $remoteglotconf::target");
 121         }
 122 }
 123 print "FICS ready.\n";
 124
 125 # Engine events have already been set up by Engine.pm.
 126 EV::run;
 127
 128 sub handle_uci {
 129         my ($engine, $line, $primary) = @_;
 130
 131         return if $line =~ /(upper|lower)bound/;
 132
 133         $line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 134         print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
 135         if ($line =~ /^info/) {
 136                 my (@infos) = split / /, $line;
 137                 shift @infos;
 138
 139                 parse_infos($engine, @infos);
 140         }
 141         if ($line =~ /^id/) {
 142                 my (@ids) = split / /, $line;
 143                 shift @ids;
 144
 145                 parse_ids($engine, @ids);
 146         }
 147         if ($line =~ /^bestmove/) {
 148                 if ($primary) {
 149                         return if (!$remoteglotconf::uci_assume_full_compliance);
 150                         if (defined($pos_waiting)) {
 151                                 uciprint($engine, "position fen " . $pos_waiting->fen());
 152                                 uciprint($engine, "go infinite");
 153
 154                                 $pos_calculating = $pos_waiting;
 155                                 $pos_waiting = undef;
 156                         }
 157                 } else {
 158                         $engine2->{'info'} = {};
 159                         my $pos = $pos_waiting // $pos_calculating;
 160                         uciprint($engine2, "position fen " . $pos->fen());
 161                         uciprint($engine2, "go infinite");
 162                         $pos_calculating_second_engine = $pos;
 163                 }
 164         }
 165         output();
 166 }
 167
 168 my $getting_movelist = 0;
 169 my $pos_for_movelist = undef;
 170 my @uci_movelist = ();
 171 my @pretty_movelist = ();
 172
 173 sub handle_fics {
 174         my $line = shift;
 175         if ($line =~ /^<12> /) {
 176                 handle_position(Position->new($line));
 177                 $t->cmd("moves");
 178         }
 179         if ($line =~ /^Movelist for game /) {
 180                 my $pos = $pos_waiting // $pos_calculating;
 181                 if (defined($pos)) {
 182                         @uci_movelist = ();
 183                         @pretty_movelist = ();
 184                         $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
 185                         $getting_movelist = 1;
 186                 }
 187         }
 188         if ($getting_movelist &&
 189             $line =~ /^\s* \d+\. \s+                     # move number
 190                        (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
 191                        (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time
 192                      /x) {
 193                 eval {
 194                         my $uci_move;
 195                         ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
 196                         push @uci_movelist, $uci_move;
 197                         push @pretty_movelist, $1;
 198
 199                         if (defined($2)) {
 200                                 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
 201                                 push @uci_movelist, $uci_move;
 202                                 push @pretty_movelist, $2;
 203                         }
 204                 };
 205                 if ($@) {
 206                         warn "Error when getting FICS move history: $@";
 207                         $getting_movelist = 0;
 208                 }
 209         }
 210         if ($getting_movelist &&
 211             $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
 212                 # End of movelist.
 213                 for my $pos ($pos_waiting, $pos_calculating) {
 214                         next if (!defined($pos));
 215                         if ($pos->fen() eq $pos_for_movelist->fen()) {
 216                                 $pos->{'pretty_history'} = \@pretty_movelist;
 217                         }
 218                 }
 219                 $getting_movelist = 0;
 220         }
 221         if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 222                 my ($who, $msg) = ($1, $2);
 223
 224                 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
 225
 226                 if ($msg =~ /^fics (.*?)$/) {
 227                         $t->cmd("tell $who Executing '$1' on FICS.");
 228                         $t->cmd($1);
 229                 } elsif ($msg =~ /^uci (.*?)$/) {
 230                         $t->cmd("tell $who Sending '$1' to the engine.");
 231                         print { $engine->{'write'} } "$1\n";
 232                 } elsif ($msg =~ /^pgn (.*?)$/) {
 233                         my $url = $1;
 234                         $t->cmd("tell $who Starting to poll '$url'.");
 235                         fetch_pgn($url);
 236                 } elsif ($msg =~ /^stoppgn$/) {
 237                         $t->cmd("tell $who Stopping poll.");
 238                         $stop_pgn_fetch = 1;
 239                         $http_timer = undef;
 240                 } elsif ($msg =~ /^quit$/) {
 241                         $t->cmd("tell $who Bye bye.");
 242                         exit;
 243                 } else {
 244                         $t->cmd("tell $who Couldn't understand '$msg', sorry.");
 245                 }
 246         }
 247         #print "FICS: [$line]\n";
 248 }
 249
 250 # Starts periodic fetching of PGNs from the given URL.
 251 sub fetch_pgn {
 252         my ($url) = @_;
 253         AnyEvent::HTTP::http_get($url, sub {
 254                 handle_pgn(@_, $url);
 255         });
 256 }
 257
 258 my ($last_pgn_white, $last_pgn_black);
 259 my @last_pgn_uci_moves = ();
 260 my $pgn_hysteresis_counter = 0;
 261
 262 sub handle_pgn {
 263         my ($body, $header, $url) = @_;
 264
 265         if ($stop_pgn_fetch) {
 266                 $stop_pgn_fetch = 0;
 267                 $http_timer = undef;
 268                 return;
 269         }
 270
 271         my $pgn = Chess::PGN::Parse->new(undef, $body);
 272         if (!defined($pgn) || !$pgn->read_game() || $body !~ /^\[/) {
 273                 warn "Error in parsing PGN from $url\n";
 274         } else {
 275                 eval {
 276                         $pgn->parse_game({ save_comments => 'yes' });
 277                         my $pos = Position->start_pos($pgn->white, $pgn->black);
 278                         my $moves = $pgn->moves;
 279                         my @uci_moves = ();
 280                         for my $move (@$moves) {
 281                                 my $uci_move;
 282                                 ($pos, $uci_move) = $pos->make_pretty_move($move);
 283                                 push @uci_moves, $uci_move;
 284                         }
 285                         $pos->{'result'} = $pgn->result;
 286                         $pos->{'pretty_history'} = $moves;
 287
 288                         extract_clock($pgn, $pos);
 289
 290                         # Sometimes, PGNs lose a move or two for a short while,
 291                         # or people push out new ones non-atomically.
 292                         # Thus, if we PGN doesn't change names but becomes
 293                         # shorter, we mistrust it for a few seconds.
 294                         my $trust_pgn = 1;
 295                         if (defined($last_pgn_white) && defined($last_pgn_black) &&
 296                             $last_pgn_white eq $pgn->white &&
 297                             $last_pgn_black eq $pgn->black &&
 298                             scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
 299                                 if (++$pgn_hysteresis_counter < 3) {
 300                                         $trust_pgn = 0;
 301                                 }
 302                         }
 303                         if ($trust_pgn) {
 304                                 $last_pgn_white = $pgn->white;
 305                                 $last_pgn_black = $pgn->black;
 306                                 @last_pgn_uci_moves = @uci_moves;
 307                                 $pgn_hysteresis_counter = 0;
 308                                 handle_position($pos);
 309                         }
 310                 };
 311                 if ($@) {
 312                         warn "Error in parsing moves from $url\n";
 313                 }
 314         }
 315
 316         $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
 317                 fetch_pgn($url);
 318         });
 319 }
 320
 321 sub handle_position {
 322         my ($pos) = @_;
 323         find_clock_start($pos);
 324
 325         # if this is already in the queue, ignore it
 326         return if (defined($pos_waiting) && $pos->fen() eq $pos_waiting->fen());
 327
 328         # if we're already chewing on this and there's nothing else in the queue,
 329         # also ignore it
 330         return if (!defined($pos_waiting) && defined($pos_calculating) &&
 331                  $pos->fen() eq $pos_calculating->fen());
 332
 333         # if we're already thinking on something, stop and wait for the engine
 334         # to approve
 335         if (defined($pos_calculating)) {
 336                 # Store the final data we have for this position in the history,
 337                 # with the precise clock information we just got from the new
 338                 # position. (Historic positions store the clock at the end of
 339                 # the position.)
 340                 #
 341                 # Do not output anything new to the main analysis; that's
 342                 # going to be obsolete really soon.
 343                 $pos_calculating->{'white_clock'} = $pos->{'white_clock'};
 344                 $pos_calculating->{'black_clock'} = $pos->{'black_clock'};
 345                 delete $pos_calculating->{'white_clock_target'};
 346                 delete $pos_calculating->{'black_clock_target'};
 347                 output_json(1);
 348
 349                 if (!defined($pos_waiting)) {
 350                         uciprint($engine, "stop");
 351                 }
 352                 if ($remoteglotconf::uci_assume_full_compliance) {
 353                         $pos_waiting = $pos;
 354                 } else {
 355                         uciprint($engine, "position fen " . $pos->fen());
 356                         uciprint($engine, "go infinite");
 357                         $pos_calculating = $pos;
 358                 }
 359         } else {
 360                 # it's wrong just to give the FEN (the move history is useful,
 361                 # and per the UCI spec, we should really have sent "ucinewgame"),
 362                 # but it's easier
 363                 uciprint($engine, "position fen " . $pos->fen());
 364                 uciprint($engine, "go infinite");
 365                 $pos_calculating = $pos;
 366         }
 367
 368         if (defined($engine2)) {
 369                 if (defined($pos_calculating_second_engine)) {
 370                         uciprint($engine2, "stop");
 371                 } else {
 372                         uciprint($engine2, "position fen " . $pos->fen());
 373                         uciprint($engine2, "go infinite");
 374                         $pos_calculating_second_engine = $pos;
 375                 }
 376                 $engine2->{'info'} = {};
 377         }
 378
 379         $engine->{'info'} = {};
 380         $last_move = time;
 381
 382         schedule_tb_lookup();
 383
 384         #
 385         # Output a command every move to note that we're
 386         # still paying attention -- this is a good tradeoff,
 387         # since if no move has happened in the last half
 388         # hour, the analysis/relay has most likely stopped
 389         # and we should stop hogging server resources.
 390         #
 391         $t->cmd("date");
 392 }
 393
 394 sub parse_infos {
 395         my ($engine, @x) = @_;
 396         my $mpv = '';
 397
 398         my $info = $engine->{'info'};
 399
 400         # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
 401         for my $i (0..$#x - 1) {
 402                 if ($x[$i] eq 'multipv') {
 403                         $mpv = $x[$i + 1];
 404                         next;
 405                 }
 406         }
 407
 408         while (scalar @x > 0) {
 409                 if ($x[0] eq 'multipv') {
 410                         # Dealt with above
 411                         shift @x;
 412                         shift @x;
 413                         next;
 414                 }
 415                 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
 416                         my $key = shift @x;
 417                         my $value = shift @x;
 418                         $info->{$key} = $value;
 419                         next;
 420                 }
 421                 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
 422                     $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
 423                     $x[0] eq 'tbhits') {
 424                         my $key = shift @x;
 425                         my $value = shift @x;
 426                         $info->{$key . $mpv} = $value;
 427                         next;
 428                 }
 429                 if ($x[0] eq 'score') {
 430                         shift @x;
 431
 432                         delete $info->{'score_cp' . $mpv};
 433                         delete $info->{'score_mate' . $mpv};
 434
 435                         while ($x[0] eq 'cp' || $x[0] eq 'mate') {
 436                                 if ($x[0] eq 'cp') {
 437                                         shift @x;
 438                                         $info->{'score_cp' . $mpv} = shift @x;
 439                                 } elsif ($x[0] eq 'mate') {
 440                                         shift @x;
 441                                         $info->{'score_mate' . $mpv} = shift @x;
 442                                 } else {
 443                                         shift @x;
 444                                 }
 445                         }
 446                         next;
 447                 }
 448                 if ($x[0] eq 'pv') {
 449                         $info->{'pv' . $mpv} = [ @x[1..$#x] ];
 450                         last;
 451                 }
 452                 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
 453                         last;
 454                 }
 455
 456                 #print "unknown info '$x[0]', trying to recover...\n";
 457                 #shift @x;
 458                 die "Unknown info '" . join(',', @x) . "'";
 459
 460         }
 461 }
 462
 463 sub parse_ids {
 464         my ($engine, @x) = @_;
 465
 466         while (scalar @x > 0) {
 467                 if ($x[0] =~ /^(name|author)$/) {
 468                         my $key = shift @x;
 469                         my $value = join(' ', @x);
 470                         $engine->{'id'}{$key} = $value;
 471                         last;
 472                 }
 473
 474                 # unknown
 475                 shift @x;
 476         }
 477 }
 478
 479 sub prettyprint_pv_no_cache {
 480         my ($board, @pvs) = @_;
 481
 482         if (scalar @pvs == 0 || !defined($pvs[0])) {
 483                 return ();
 484         }
 485
 486         my $pv = shift @pvs;
 487         my ($from_col, $from_row, $to_col, $to_row, $promo) = parse_uci_move($pv);
 488         my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 489         return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
 490 }
 491
 492 sub prettyprint_pv {
 493         my ($pos, @pvs) = @_;
 494
 495         my $cachekey = join('', @pvs);
 496         if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
 497                 return @{$pos->{'prettyprint_cache'}{$cachekey}};
 498         } else {
 499                 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
 500                 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
 501                 return @res;
 502         }
 503 }
 504
 505 sub output {
 506         #return;
 507
 508         return if (!defined($pos_calculating));
 509
 510         # Don't update too often.
 511         my $age = Time::HiRes::tv_interval($latest_update);
 512         if ($age < $remoteglotconf::update_max_interval) {
 513                 my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
 514                 $output_timer = AnyEvent->timer(after => $wait, cb => \&output);
 515                 return;
 516         }
 517
 518         my $info = $engine->{'info'};
 519
 520         #
 521         # If we have tablebase data from a previous lookup, replace the
 522         # engine data with the data from the tablebase.
 523         #
 524         my $fen = $pos_calculating->fen();
 525         if (exists($tb_cache{$fen})) {
 526                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 527                         delete $info->{$key . '1'};
 528                         delete $info->{$key};
 529                 }
 530                 $info->{'nodes'} = 0;
 531                 $info->{'nps'} = 0;
 532                 $info->{'depth'} = 0;
 533                 $info->{'seldepth'} = 0;
 534                 $info->{'tbhits'} = 0;
 535
 536                 my $t = $tb_cache{$fen};
 537                 my $pv = $t->{'pv'};
 538                 my $matelen = int((1 + $t->{'score'}) / 2);
 539                 if ($t->{'result'} eq '1/2-1/2') {
 540                         $info->{'score_cp'} = 0;
 541                 } elsif ($t->{'result'} eq '1-0') {
 542                         if ($pos_calculating->{'toplay'} eq 'B') {
 543                                 $info->{'score_mate'} = -$matelen;
 544                         } else {
 545                                 $info->{'score_mate'} = $matelen;
 546                         }
 547                 } else {
 548                         if ($pos_calculating->{'toplay'} eq 'B') {
 549                                 $info->{'score_mate'} = $matelen;
 550                         } else {
 551                                 $info->{'score_mate'} = -$matelen;
 552                         }
 553                 }
 554                 $info->{'pv'} = $pv;
 555                 $info->{'tablebase'} = 1;
 556         } else {
 557                 $info->{'tablebase'} = 0;
 558         }
 559
 560         #
 561         # Some programs _always_ report MultiPV, even with only one PV.
 562         # In this case, we simply use that data as if MultiPV was never
 563         # specified.
 564         #
 565         if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
 566                 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 567                         if (exists($info->{$key . '1'})) {
 568                                 $info->{$key} = $info->{$key . '1'};
 569                         }
 570                 }
 571         }
 572
 573         #
 574         # Check the PVs first. if they're invalid, just wait, as our data
 575         # is most likely out of sync. This isn't a very good solution, as
 576         # it can frequently miss stuff, but it's good enough for most users.
 577         #
 578         eval {
 579                 my $dummy;
 580                 if (exists($info->{'pv'})) {
 581                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
 582                 }
 583
 584                 my $mpv = 1;
 585                 while (exists($info->{'pv' . $mpv})) {
 586                         $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
 587                         ++$mpv;
 588                 }
 589         };
 590         if ($@) {
 591                 $engine->{'info'} = {};
 592                 return;
 593         }
 594
 595         output_screen();
 596         output_json(0);
 597         $latest_update = [Time::HiRes::gettimeofday];
 598 }
 599
 600 sub output_screen {
 601         my $info = $engine->{'info'};
 602         my $id = $engine->{'id'};
 603
 604         my $text = 'Analysis';
 605         if ($pos_calculating->{'last_move'} ne 'none') {
 606                 if ($pos_calculating->{'toplay'} eq 'W') {
 607                         $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
 608                 } else {
 609                         $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
 610                 }
 611                 if (exists($id->{'name'})) {
 612                         $text .= ',';
 613                 }
 614         }
 615
 616         if (exists($id->{'name'})) {
 617                 $text .= " by $id->{'name'}:\n\n";
 618         } else {
 619                 $text .= ":\n\n";
 620         }
 621
 622         return unless (exists($pos_calculating->{'board'}));
 623
 624         if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
 625                 # multi-PV
 626                 my $mpv = 1;
 627                 while (exists($info->{'pv' . $mpv})) {
 628                         $text .= sprintf "  PV%2u", $mpv;
 629                         my $score = short_score($info, $pos_calculating, $mpv);
 630                         $text .= "  ($score)" if (defined($score));
 631
 632                         my $tbhits = '';
 633                         if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
 634                                 if ($info->{'tbhits' . $mpv} == 1) {
 635                                         $tbhits = ", 1 tbhit";
 636                                 } else {
 637                                         $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
 638                                 }
 639                         }
 640
 641                         if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
 642                                 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
 643                                         $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
 644                         }
 645
 646                         $text .= ":\n";
 647                         $text .= "  " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
 648                         $text .= "\n";
 649                         ++$mpv;
 650                 }
 651         } else {
 652                 # single-PV
 653                 my $score = long_score($info, $pos_calculating, '');
 654                 $text .= "  $score\n" if defined($score);
 655                 $text .=  "  PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
 656                 $text .=  "\n";
 657
 658                 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
 659                         $text .= sprintf "  %u nodes, %7u nodes/sec, depth %u ply",
 660                                 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
 661                 }
 662                 if (exists($info->{'seldepth'})) {
 663                         $text .= sprintf " (%u selective)", $info->{'seldepth'};
 664                 }
 665                 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
 666                         if ($info->{'tbhits'} == 1) {
 667                                 $text .= ", one Syzygy hit";
 668                         } else {
 669                                 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
 670                         }
 671                 }
 672                 $text .= "\n\n";
 673         }
 674
 675         #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
 676
 677         my @refutation_lines = ();
 678         if (defined($engine2)) {
 679                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 680                         my $info = $engine2->{'info'};
 681                         last if (!exists($info->{'pv' . $mpv}));
 682                         eval {
 683                                 my $pv = $info->{'pv' . $mpv};
 684
 685                                 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 686                                 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 687                                 if (scalar @pretty_pv > 5) {
 688                                         @pretty_pv = @pretty_pv[0..4];
 689                                         push @pretty_pv, "...";
 690                                 }
 691                                 my $key = $pretty_move;
 692                                 my $line = sprintf("  %-6s %6s %3s  %s",
 693                                         $pretty_move,
 694                                         short_score($info, $pos_calculating_second_engine, $mpv),
 695                                         "d" . $info->{'depth' . $mpv},
 696                                         join(', ', @pretty_pv));
 697                                 push @refutation_lines, [ $key, $line ];
 698                         };
 699                 }
 700         }
 701
 702         if ($#refutation_lines >= 0) {
 703                 $text .= "Shallow search of all legal moves:\n\n";
 704                 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
 705                         $text .= $line->[1] . "\n";
 706                 }
 707                 $text .= "\n\n";
 708         }
 709
 710         if ($last_text ne $text) {
 711                 print "\e[H\e[2J"; # clear the screen
 712                 print $text;
 713                 $last_text = $text;
 714         }
 715 }
 716
 717 sub output_json {
 718         my $historic_json_only = shift;
 719         my $info = $engine->{'info'};
 720
 721         my $json = {};
 722         $json->{'position'} = $pos_calculating->to_json_hash();
 723         $json->{'id'} = $engine->{'id'};
 724         $json->{'score'} = long_score($info, $pos_calculating, '');
 725         $json->{'short_score'} = short_score($info, $pos_calculating, '');
 726
 727         $json->{'nodes'} = $info->{'nodes'};
 728         $json->{'nps'} = $info->{'nps'};
 729         $json->{'depth'} = $info->{'depth'};
 730         $json->{'tbhits'} = $info->{'tbhits'};
 731         $json->{'seldepth'} = $info->{'seldepth'};
 732         $json->{'tablebase'} = $info->{'tablebase'};
 733
 734         $json->{'pv_uci'} = $info->{'pv'};  # Still needs to be there for the JS to calculate arrows; only for the primary PV, though!
 735         $json->{'pv_pretty'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 736
 737         my %refutation_lines = ();
 738         my @refutation_lines = ();
 739         if (defined($engine2)) {
 740                 for (my $mpv = 1; $mpv < 500; ++$mpv) {
 741                         my $info = $engine2->{'info'};
 742                         my $pretty_move = "";
 743                         my @pretty_pv = ();
 744                         last if (!exists($info->{'pv' . $mpv}));
 745
 746                         eval {
 747                                 my $pv = $info->{'pv' . $mpv};
 748                                 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 749                                 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
 750                                 $refutation_lines{$pv->[0]} = {
 751                                         sort_key => $pretty_move,
 752                                         depth => $info->{'depth' . $mpv},
 753                                         score_sort_key => score_sort_key($info, $pos_calculating, $mpv, 0),
 754                                         pretty_score => short_score($info, $pos_calculating, $mpv),
 755                                         pretty_move => $pretty_move,
 756                                         pv_pretty => \@pretty_pv,
 757                                 };
 758                         };
 759                 }
 760         }
 761         $json->{'refutation_lines'} = \%refutation_lines;
 762
 763         my $encoded = JSON::XS::encode_json($json);
 764         unless ($historic_json_only || !defined($remoteglotconf::json_output) ||
 765                 (defined($last_written_json) && $last_written_json eq $encoded)) {
 766                 atomic_set_contents($remoteglotconf::json_output, $encoded);
 767                 $last_written_json = $encoded;
 768         }
 769
 770         if (exists($pos_calculating->{'pretty_history'}) &&
 771             defined($remoteglotconf::json_history_dir)) {
 772                 my $filename = $remoteglotconf::json_history_dir . "/" . id_for_pos($pos_calculating) . ".json";
 773
 774                 # Overwrite old analysis (assuming it exists at all) if we're
 775                 # using a different engine, or if we've calculated deeper.
 776                 # nodes is used as a tiebreaker. Don't bother about Multi-PV
 777                 # data; it's not that important.
 778                 my ($old_engine, $old_depth, $old_nodes) = get_json_analysis_stats($filename);
 779                 my $new_depth = $json->{'depth'} // 0;
 780                 my $new_nodes = $json->{'nodes'} // 0;
 781                 if (!defined($old_engine) ||
 782                     $old_engine ne $json->{'id'}{'name'} ||
 783                     $new_depth > $old_depth ||
 784                     ($new_depth == $old_depth && $new_nodes >= $old_nodes)) {
 785                         atomic_set_contents($filename, $encoded);
 786                 }
 787         }
 788 }
 789
 790 sub atomic_set_contents {
 791         my ($filename, $contents) = @_;
 792
 793         open my $fh, ">", $filename . ".tmp"
 794                 or return;
 795         print $fh $contents;
 796         close $fh;
 797         rename($filename . ".tmp", $filename);
 798 }
 799
 800 sub id_for_pos {
 801         my $pos = shift;
 802
 803         my $halfmove_num = scalar @{$pos->{'pretty_history'}};
 804         (my $fen = $pos->fen()) =~ tr,/ ,-_,;
 805         return "move$halfmove_num-$fen";
 806 }
 807
 808 sub get_json_analysis_stats {
 809         my $filename = shift;
 810
 811         my ($engine, $depth, $nodes);
 812
 813         open my $fh, "<", $filename
 814                 or return undef;
 815         local $/ = undef;
 816         eval {
 817                 my $json = JSON::XS::decode_json(<$fh>);
 818                 $engine = $json->{'id'}{'name'} // die;
 819                 $depth = $json->{'depth'} // 0;
 820                 $nodes = $json->{'nodes'} // 0;
 821         };
 822         close $fh;
 823         if ($@) {
 824                 warn "Error in decoding $filename: $@";
 825                 return undef;
 826         }
 827         return ($engine, $depth, $nodes);
 828 }
 829
 830 sub uciprint {
 831         my ($engine, $msg) = @_;
 832         $engine->print($msg);
 833         print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
 834 }
 835
 836 sub short_score {
 837         my ($info, $pos, $mpv) = @_;
 838
 839         my $invert = ($pos->{'toplay'} eq 'B');
 840         if (defined($info->{'score_mate' . $mpv})) {
 841                 if ($invert) {
 842                         return sprintf "M%3d", -$info->{'score_mate' . $mpv};
 843                 } else {
 844                         return sprintf "M%3d", $info->{'score_mate' . $mpv};
 845                 }
 846         } else {
 847                 if (exists($info->{'score_cp' . $mpv})) {
 848                         my $score = $info->{'score_cp' . $mpv} * 0.01;
 849                         if ($score == 0) {
 850                                 if ($info->{'tablebase'}) {
 851                                         return "TB draw";
 852                                 } else {
 853                                         return " 0.00";
 854                                 }
 855                         }
 856                         if ($invert) {
 857                                 $score = -$score;
 858                         }
 859                         return sprintf "%+5.2f", $score;
 860                 }
 861         }
 862
 863         return undef;
 864 }
 865
 866 sub score_sort_key {
 867         my ($info, $pos, $mpv, $invert) = @_;
 868
 869         if (defined($info->{'score_mate' . $mpv})) {
 870                 my $mate = $info->{'score_mate' . $mpv};
 871                 my $score;
 872                 if ($mate > 0) {
 873                         # Side to move mates
 874                         $score = 99999 - $mate;
 875                 } else {
 876                         # Side to move is getting mated (note the double negative for $mate)
 877                         $score = -99999 - $mate;
 878                 }
 879                 if ($invert) {
 880                         $score = -$score;
 881                 }
 882                 return $score;
 883         } else {
 884                 if (exists($info->{'score_cp' . $mpv})) {
 885                         my $score = $info->{'score_cp' . $mpv};
 886                         if ($invert) {
 887                                 $score = -$score;
 888                         }
 889                         return $score;
 890                 }
 891         }
 892
 893         return undef;
 894 }
 895
 896 sub long_score {
 897         my ($info, $pos, $mpv) = @_;
 898
 899         if (defined($info->{'score_mate' . $mpv})) {
 900                 my $mate = $info->{'score_mate' . $mpv};
 901                 if ($pos->{'toplay'} eq 'B') {
 902                         $mate = -$mate;
 903                 }
 904                 if ($mate > 0) {
 905                         return sprintf "White mates in %u", $mate;
 906                 } else {
 907                         return sprintf "Black mates in %u", -$mate;
 908                 }
 909         } else {
 910                 if (exists($info->{'score_cp' . $mpv})) {
 911                         my $score = $info->{'score_cp' . $mpv} * 0.01;
 912                         if ($score == 0) {
 913                                 if ($info->{'tablebase'}) {
 914                                         return "Theoretical draw";
 915                                 } else {
 916                                         return "Score:  0.00";
 917                                 }
 918                         }
 919                         if ($pos->{'toplay'} eq 'B') {
 920                                 $score = -$score;
 921                         }
 922                         return sprintf "Score: %+5.2f", $score;
 923                 }
 924         }
 925
 926         return undef;
 927 }
 928
 929 my %book_cache = ();
 930 sub book_info {
 931         my ($fen, $board, $toplay) = @_;
 932
 933         if (exists($book_cache{$fen})) {
 934                 return $book_cache{$fen};
 935         }
 936
 937         my $ret = `./booklook $fen`;
 938         return "" if ($ret =~ /Not found/ || $ret eq '');
 939
 940         my @moves = ();
 941
 942         for my $m (split /\n/, $ret) {
 943                 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
 944
 945                 my $pmove;
 946                 if ($move eq '')  {
 947                         $pmove = '(current)';
 948                 } else {
 949                         ($pmove) = prettyprint_pv_no_cache($board, $move);
 950                         $pmove .= $annotation;
 951                 }
 952
 953                 my $score;
 954                 if ($toplay eq 'W') {
 955                         $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
 956                 } else {
 957                         $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
 958                 }
 959                 my $n = $win + $draw + $lose;
 960
 961                 my $percent;
 962                 if ($n == 0) {
 963                         $percent = "     ";
 964                 } else {
 965                         $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
 966                 }
 967
 968                 push @moves, [ $pmove, $n, $percent, $rating ];
 969         }
 970
 971         @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
 972
 973         my $text = "Book moves:\n\n              Perf.     N     Rating\n\n";
 974         for my $m (@moves) {
 975                 $text .= sprintf "  %-10s %s   %6u    %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
 976         }
 977
 978         return $text;
 979 }
 980
 981 sub extract_clock {
 982         my ($pgn, $pos) = @_;
 983
 984         # Look for extended PGN clock tags.
 985         my $tags = $pgn->tags;
 986         if (exists($tags->{'WhiteClock'}) && exists($tags->{'BlackClock'})) {
 987                 $pos->{'white_clock'} = $tags->{'WhiteClock'};
 988                 $pos->{'black_clock'} = $tags->{'BlackClock'};
 989
 990                 $pos->{'white_clock'} =~ s/\b(\d)\b/0$1/g;
 991                 $pos->{'black_clock'} =~ s/\b(\d)\b/0$1/g;
 992                 return;
 993         }
 994
 995         # Look for TCEC-style time comments.
 996         my $moves = $pgn->moves;
 997         my $comments = $pgn->comments;
 998         my $last_black_move = int((scalar @$moves) / 2);
 999         my $last_white_move = int((1 + scalar @$moves) / 2);
1000
1001         my $black_key = $last_black_move . "b";
1002         my $white_key = $last_white_move . "w";
1003
1004         if (exists($comments->{$white_key}) &&
1005             exists($comments->{$black_key}) &&
1006             $comments->{$white_key} =~ /tl=(\d+:\d+:\d+)/ &&
1007             $comments->{$black_key} =~ /tl=(\d+:\d+:\d+)/) {
1008                 $comments->{$white_key} =~ /tl=(\d+:\d+:\d+)/;
1009                 $pos->{'white_clock'} = $1;
1010                 $comments->{$black_key} =~ /tl=(\d+:\d+:\d+)/;
1011                 $pos->{'black_clock'} = $1;
1012                 return;
1013         }
1014 }
1015
1016 sub find_clock_start {
1017         my $pos = shift;
1018
1019         # If the game is over, the clock is stopped.
1020         if (exists($pos->{'result'}) &&
1021             ($pos->{'result'} eq '1-0' ||
1022              $pos->{'result'} eq '1/2-1/2' ||
1023              $pos->{'result'} eq '0-1')) {
1024                 return;
1025         }
1026
1027         # When we don't have any moves, we assume the clock hasn't started yet.
1028         if ($pos->{'move_num'} == 1 && $pos->{'toplay'} eq 'W') {
1029                 return;
1030         }
1031
1032         # TODO(sesse): Maybe we can get the number of moves somehow else for FICS games.
1033         if (!exists($pos->{'pretty_history'})) {
1034                 return;
1035         }
1036
1037         my $id = id_for_pos($pos);
1038         if (exists($clock_target_for_pos{$id})) {
1039                 if ($pos->{'toplay'} eq 'W') {
1040                         $pos->{'white_clock_target'} = $clock_target_for_pos{$id};
1041                 } else {
1042                         $pos->{'black_clock_target'} = $clock_target_for_pos{$id};
1043                 }
1044                 return;
1045         }
1046
1047         # OK, we haven't seen this position before, so we assume the move
1048         # happened right now.
1049         my $key = ($pos->{'toplay'} eq 'W') ? 'white_clock' : 'black_clock';
1050         if (!exists($pos->{$key})) {
1051                 # No clock information.
1052                 return;
1053         }
1054         $pos->{$key} =~ /(\d+):(\d+):(\d+)/;
1055         my $time_left = $1 * 3600 + $2 * 60 + $3;
1056         $clock_target_for_pos{$id} = time + $time_left;
1057         if ($pos->{'toplay'} eq 'W') {
1058                 $pos->{'white_clock_target'} = $clock_target_for_pos{$id};
1059         } else {
1060                 $pos->{'black_clock_target'} = $clock_target_for_pos{$id};
1061         }
1062 }
1063
1064 sub schedule_tb_lookup {
1065         return if (!defined($remoteglotconf::tb_serial_key));
1066         my $pos = $pos_waiting // $pos_calculating;
1067         return if (exists($tb_cache{$pos->fen()}));
1068
1069         # If there's more than seven pieces, there's not going to be an answer,
1070         # so don't bother.
1071         return if ($pos->num_pieces() > 7);
1072
1073         # Max one at a time. If it's still relevant when it returns,
1074         # schedule_tb_lookup() will be called again.
1075         return if ($tb_lookup_running);
1076
1077         $tb_lookup_running = 1;
1078         my $url = 'http://158.250.18.203:6904/tasks/addtask?auth.login=' .
1079                 $remoteglotconf::tb_serial_key .
1080                 '&auth.password=aquarium&type=0&fen=' .
1081                 URI::Escape::uri_escape($pos->fen());
1082         print TBLOG "Downloading $url...\n";
1083         AnyEvent::HTTP::http_get($url, sub {
1084                 handle_tb_lookup_return(@_, $pos, $pos->fen());
1085         });
1086 }
1087
1088 sub handle_tb_lookup_return {
1089         my ($body, $header, $pos, $fen) = @_;
1090         print TBLOG "Response for [$fen]:\n";
1091         print TBLOG $header . "\n\n";
1092         print TBLOG $body . "\n\n";
1093         eval {
1094                 my $response = JSON::XS::decode_json($body);
1095                 if ($response->{'ErrorCode'} != 0) {
1096                         die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
1097                 }
1098                 my $state = $response->{'Response'}{'StateString'};
1099                 if ($state eq 'COMPLETE') {
1100                         my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
1101                         if (!defined($pgn) || !$pgn->read_game()) {
1102                                 warn "Error in parsing PGN\n";
1103                         } else {
1104                                 $pgn->quick_parse_game;
1105                                 my $pvpos = $pos;
1106                                 my $moves = $pgn->moves;
1107                                 my @uci_moves = ();
1108                                 for my $move (@$moves) {
1109                                         my $uci_move;
1110                                         ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
1111                                         push @uci_moves, $uci_move;
1112                                 }
1113                                 $tb_cache{$fen} = {
1114                                         result => $pgn->result,
1115                                         pv => \@uci_moves,
1116                                         score => $response->{'Response'}{'Score'},
1117                                 };
1118                                 output();
1119                         }
1120                 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
1121                         # Try again in a second. Note that if we have changed
1122                         # position in the meantime, we might query a completely
1123                         # different position! But that's fine.
1124                 } else {
1125                         die "Unknown response state " . $state;
1126                 }
1127
1128                 # Wait a second before we schedule another one.
1129                 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
1130                         $tb_lookup_running = 0;
1131                         schedule_tb_lookup();
1132                 });
1133         };
1134         if ($@) {
1135                 warn "Error in tablebase lookup: $@";
1136
1137                 # Don't try this one again, but don't block new lookups either.
1138                 $tb_lookup_running = 0;
1139         }
1140 }
1141
1142 sub open_engine {
1143         my ($cmdline, $tag, $cb) = @_;
1144         return undef if (!defined($cmdline));
1145         return Engine->open($cmdline, $tag, $cb);
1146 }
1147
1148 sub col_letter_to_num {
1149         return ord(shift) - ord('a');
1150 }
1151
1152 sub row_letter_to_num {
1153         return 7 - (ord(shift) - ord('1'));
1154 }
1155
1156 sub parse_uci_move {
1157         my $move = shift;
1158         my $from_col = col_letter_to_num(substr($move, 0, 1));
1159         my $from_row = row_letter_to_num(substr($move, 1, 1));
1160         my $to_col   = col_letter_to_num(substr($move, 2, 1));
1161         my $to_row   = row_letter_to_num(substr($move, 3, 1));
1162         my $promo    = substr($move, 4, 1);
1163         return ($from_col, $from_row, $to_col, $to_row, $promo);
1164 }