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.)
8 # Copyright 2007 Steinar H. Gunderson <sgunderson@bigfoot.com>
9 # Licensed under the GNU General Public License, version 2.
15 use Chess::PGN::Parse;
23 require 'Position.pm';
31 my $latest_update = undef;
32 my $output_timer = undef;
33 my $http_timer = undef;
34 my $tb_retry_timer = undef;
36 my $tb_lookup_running = 0;
40 open(FICSLOG, ">ficslog.txt")
41 or die "ficslog.txt: $!";
42 print FICSLOG "Log starting.\n";
46 open(UCILOG, ">ucilog.txt")
47 or die "ucilog.txt: $!";
48 print UCILOG "Log starting.\n";
52 open(TBLOG, ">tblog.txt")
53 or die "tblog.txt: $!";
54 print TBLOG "Log starting.\n";
60 # open the chess engine
61 my $engine = open_engine($remoteglotconf::engine_cmdline, 'E1', sub { handle_uci(@_, 1); });
62 my $engine2 = open_engine($remoteglotconf::engine2_cmdline, 'E2', sub { handle_uci(@_, 0); });
65 my ($pos_waiting, $pos_calculating, $pos_calculating_second_engine);
67 uciprint($engine, "setoption name UCI_AnalyseMode value true");
68 while (my ($key, $value) = each %remoteglotconf::engine_config) {
69 uciprint($engine, "setoption name $key value $value");
71 uciprint($engine, "ucinewgame");
73 if (defined($engine2)) {
74 uciprint($engine2, "setoption name UCI_AnalyseMode value true");
75 while (my ($key, $value) = each %remoteglotconf::engine2_config) {
76 uciprint($engine2, "setoption name $key value $value");
78 uciprint($engine2, "setoption name MultiPV value 500");
79 uciprint($engine2, "ucinewgame");
82 print "Chess engine ready.\n";
85 my $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
86 $t->input_log(\*FICSLOG);
87 $t->open($remoteglotconf::server);
88 $t->print($remoteglotconf::nick);
89 $t->waitfor('/Press return to enter the server/');
93 $t->cmd("set shout 0");
94 $t->cmd("set seek 0");
95 $t->cmd("set style 12");
97 my $ev1 = AnyEvent->io(
100 cb => sub { # what callback to execute
102 my $line = $t->getline(Timeout => 0, errmode => 'return');
103 return if (!defined($line));
111 if (defined($remoteglotconf::target)) {
112 if ($remoteglotconf::target =~ /^http:/) {
113 fetch_pgn($remoteglotconf::target);
115 $t->cmd("observe $remoteglotconf::target");
118 print "FICS ready.\n";
120 # Engine events have already been set up by Engine.pm.
124 my ($engine, $line, $primary) = @_;
126 return if $line =~ /(upper|lower)bound/;
128 $line =~ s/ / /g; # Sometimes needed for Zappa Mexico
129 print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
130 if ($line =~ /^info/) {
131 my (@infos) = split / /, $line;
134 parse_infos($engine, @infos);
136 if ($line =~ /^id/) {
137 my (@ids) = split / /, $line;
140 parse_ids($engine, @ids);
142 if ($line =~ /^bestmove/) {
144 return if (!$remoteglotconf::uci_assume_full_compliance);
145 if (defined($pos_waiting)) {
146 uciprint($engine, "position fen " . $pos_waiting->fen());
147 uciprint($engine, "go infinite");
149 $pos_calculating = $pos_waiting;
150 $pos_waiting = undef;
153 $engine2->{'info'} = {};
154 my $pos = $pos_waiting // $pos_calculating;
155 uciprint($engine2, "position fen " . $pos->fen());
156 uciprint($engine2, "go infinite");
157 $pos_calculating_second_engine = $pos;
163 my $getting_movelist = 0;
164 my $pos_for_movelist = undef;
165 my @uci_movelist = ();
166 my @pretty_movelist = ();
170 if ($line =~ /^<12> /) {
171 handle_position(Position->new($line));
174 if ($line =~ /^Movelist for game /) {
175 my $pos = $pos_waiting // $pos_calculating;
178 @pretty_movelist = ();
179 $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
180 $getting_movelist = 1;
183 if ($getting_movelist &&
184 $line =~ /^\s* \d+\. \s+ # move number
185 (\S+) \s+ \( [\d:.]+ \) \s* # first move, then time
186 (?: (\S+) \s+ \( [\d:.]+ \) )? # second move, then time
190 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
191 push @uci_movelist, $uci_move;
192 push @pretty_movelist, $1;
195 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
196 push @uci_movelist, $uci_move;
197 push @pretty_movelist, $2;
201 warn "Error when getting FICS move history: $@";
203 $getting_movelist = 0;
206 if ($getting_movelist &&
207 $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
209 for my $pos ($pos_waiting, $pos_calculating) {
210 next if (!defined($pos));
211 if ($pos->fen() eq $pos_for_movelist->fen()) {
212 $pos->{'history'} = \@uci_movelist;
213 $pos->{'pretty_history'} = \@pretty_movelist;
216 $getting_movelist = 0;
218 if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
219 my ($who, $msg) = ($1, $2);
221 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
223 if ($msg =~ /^fics (.*?)$/) {
224 $t->cmd("tell $who Executing '$1' on FICS.");
226 } elsif ($msg =~ /^uci (.*?)$/) {
227 $t->cmd("tell $who Sending '$1' to the engine.");
228 print { $engine->{'write'} } "$1\n";
229 } elsif ($msg =~ /^pgn (.*?)$/) {
231 $t->cmd("tell $who Starting to poll '$url'.");
233 } elsif ($msg =~ /^stoppgn$/) {
234 $t->cmd("tell $who Stopping poll.");
236 } elsif ($msg =~ /^quit$/) {
237 $t->cmd("tell $who Bye bye.");
240 $t->cmd("tell $who Couldn't understand '$msg', sorry.");
243 #print "FICS: [$line]\n";
246 # Starts periodic fetching of PGNs from the given URL.
249 AnyEvent::HTTP::http_get($url, sub {
250 handle_pgn(@_, $url);
254 my ($last_pgn_white, $last_pgn_black);
255 my @last_pgn_uci_moves = ();
256 my $pgn_hysteresis_counter = 0;
259 my ($body, $header, $url) = @_;
260 my $pgn = Chess::PGN::Parse->new(undef, $body);
261 if (!defined($pgn) || !$pgn->read_game()) {
262 warn "Error in parsing PGN from $url\n";
264 $pgn->quick_parse_game;
265 my $pos = Position->start_pos($pgn->white, $pgn->black);
266 my $moves = $pgn->moves;
268 for my $move (@$moves) {
270 ($pos, $uci_move) = $pos->make_pretty_move($move);
271 push @uci_moves, $uci_move;
273 $pos->{'history'} = \@uci_moves;
274 $pos->{'pretty_history'} = $moves;
276 # Sometimes, PGNs lose a move or two for a short while,
277 # or people push out new ones non-atomically.
278 # Thus, if we PGN doesn't change names but becomes
279 # shorter, we mistrust it for a few seconds.
281 if (defined($last_pgn_white) && defined($last_pgn_black) &&
282 $last_pgn_white eq $pgn->white &&
283 $last_pgn_black eq $pgn->black &&
284 scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
285 if (++$pgn_hysteresis_counter < 3) {
290 $last_pgn_white = $pgn->white;
291 $last_pgn_black = $pgn->black;
292 @last_pgn_uci_moves = @uci_moves;
293 $pgn_hysteresis_counter = 0;
294 handle_position($pos);
298 $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
303 sub handle_position {
306 # if this is already in the queue, ignore it
307 return if (defined($pos_waiting) && $pos->fen() eq $pos_waiting->fen());
309 # if we're already chewing on this and there's nothing else in the queue,
311 return if (!defined($pos_waiting) && defined($pos_calculating) &&
312 $pos->fen() eq $pos_calculating->fen());
314 # if we're already thinking on something, stop and wait for the engine
316 if (defined($pos_calculating)) {
317 if (!defined($pos_waiting)) {
318 uciprint($engine, "stop");
320 if ($remoteglotconf::uci_assume_full_compliance) {
323 uciprint($engine, "position fen " . $pos->fen());
324 uciprint($engine, "go infinite");
325 $pos_calculating = $pos;
328 # it's wrong just to give the FEN (the move history is useful,
329 # and per the UCI spec, we should really have sent "ucinewgame"),
331 uciprint($engine, "position fen " . $pos->fen());
332 uciprint($engine, "go infinite");
333 $pos_calculating = $pos;
336 if (defined($engine2)) {
337 if (defined($pos_calculating_second_engine)) {
338 uciprint($engine2, "stop");
340 uciprint($engine2, "position fen " . $pos->fen());
341 uciprint($engine2, "go infinite");
342 $pos_calculating_second_engine = $pos;
344 $engine2->{'info'} = {};
347 $engine->{'info'} = {};
350 schedule_tb_lookup();
353 # Output a command every move to note that we're
354 # still paying attention -- this is a good tradeoff,
355 # since if no move has happened in the last half
356 # hour, the analysis/relay has most likely stopped
357 # and we should stop hogging server resources.
363 my ($engine, @x) = @_;
366 my $info = $engine->{'info'};
368 # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
369 for my $i (0..$#x - 1) {
370 if ($x[$i] eq 'multipv') {
376 while (scalar @x > 0) {
377 if ($x[0] eq 'multipv') {
383 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
385 my $value = shift @x;
386 $info->{$key} = $value;
389 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
390 $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
393 my $value = shift @x;
394 $info->{$key . $mpv} = $value;
397 if ($x[0] eq 'score') {
400 delete $info->{'score_cp' . $mpv};
401 delete $info->{'score_mate' . $mpv};
403 while ($x[0] eq 'cp' || $x[0] eq 'mate') {
406 $info->{'score_cp' . $mpv} = shift @x;
407 } elsif ($x[0] eq 'mate') {
409 $info->{'score_mate' . $mpv} = shift @x;
417 $info->{'pv' . $mpv} = [ @x[1..$#x] ];
420 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
424 #print "unknown info '$x[0]', trying to recover...\n";
426 die "Unknown info '" . join(',', @x) . "'";
432 my ($engine, @x) = @_;
434 while (scalar @x > 0) {
435 if ($x[0] =~ /^(name|author)$/) {
437 my $value = join(' ', @x);
438 $engine->{'id'}{$key} = $value;
447 sub prettyprint_pv_no_cache {
448 my ($board, @pvs) = @_;
450 if (scalar @pvs == 0 || !defined($pvs[0])) {
455 my ($from_col, $from_row, $to_col, $to_row, $promo) = parse_uci_move($pv);
456 my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
457 return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
461 my ($pos, @pvs) = @_;
463 my $cachekey = join('', @pvs);
464 if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
465 return @{$pos->{'prettyprint_cache'}{$cachekey}};
467 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
468 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
476 return if (!defined($pos_calculating));
478 # Don't update too often.
479 my $age = Time::HiRes::tv_interval($latest_update);
480 if ($age < $remoteglotconf::update_max_interval) {
481 my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
482 $output_timer = AnyEvent->timer(after => $wait, cb => \&output);
486 my $info = $engine->{'info'};
489 # If we have tablebase data from a previous lookup, replace the
490 # engine data with the data from the tablebase.
492 my $fen = $pos_calculating->fen();
493 if (exists($tb_cache{$fen})) {
494 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
495 delete $info->{$key . '1'};
496 delete $info->{$key};
498 $info->{'nodes'} = 0;
500 $info->{'depth'} = 0;
501 $info->{'seldepth'} = 0;
502 $info->{'tbhits'} = 0;
504 my $t = $tb_cache{$fen};
506 my $matelen = int((1 + scalar @$pv) / 2);
507 if ($t->{'result'} eq '1/2-1/2') {
508 $info->{'score_cp'} = 0;
509 } elsif ($t->{'result'} eq '1-0') {
510 if ($pos_calculating->{'toplay'} eq 'B') {
511 $info->{'score_mate'} = -$matelen;
513 $info->{'score_mate'} = $matelen;
516 if ($pos_calculating->{'toplay'} eq 'B') {
517 $info->{'score_mate'} = $matelen;
519 $info->{'score_mate'} = -$matelen;
523 $info->{'tablebase'} = 1;
525 $info->{'tablebase'} = 0;
529 # Some programs _always_ report MultiPV, even with only one PV.
530 # In this case, we simply use that data as if MultiPV was never
533 if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
534 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
535 if (exists($info->{$key . '1'})) {
536 $info->{$key} = $info->{$key . '1'};
542 # Check the PVs first. if they're invalid, just wait, as our data
543 # is most likely out of sync. This isn't a very good solution, as
544 # it can frequently miss stuff, but it's good enough for most users.
548 if (exists($info->{'pv'})) {
549 $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
553 while (exists($info->{'pv' . $mpv})) {
554 $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
559 $engine->{'info'} = {};
565 $latest_update = [Time::HiRes::gettimeofday];
569 my $info = $engine->{'info'};
570 my $id = $engine->{'id'};
572 my $text = 'Analysis';
573 if ($pos_calculating->{'last_move'} ne 'none') {
574 if ($pos_calculating->{'toplay'} eq 'W') {
575 $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
577 $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
579 if (exists($id->{'name'})) {
584 if (exists($id->{'name'})) {
585 $text .= " by $id->{'name'}:\n\n";
590 return unless (exists($pos_calculating->{'board'}));
592 if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
595 while (exists($info->{'pv' . $mpv})) {
596 $text .= sprintf " PV%2u", $mpv;
597 my $score = short_score($info, $pos_calculating, $mpv);
598 $text .= " ($score)" if (defined($score));
601 if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
602 if ($info->{'tbhits' . $mpv} == 1) {
603 $tbhits = ", 1 tbhit";
605 $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
609 if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
610 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
611 $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
615 $text .= " " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
621 my $score = long_score($info, $pos_calculating, '');
622 $text .= " $score\n" if defined($score);
623 $text .= " PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
626 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
627 $text .= sprintf " %u nodes, %7u nodes/sec, depth %u ply",
628 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
630 if (exists($info->{'seldepth'})) {
631 $text .= sprintf " (%u selective)", $info->{'seldepth'};
633 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
634 if ($info->{'tbhits'} == 1) {
635 $text .= ", one Syzygy hit";
637 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
643 #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
645 my @refutation_lines = ();
646 if (defined($engine2)) {
647 for (my $mpv = 1; $mpv < 500; ++$mpv) {
648 my $info = $engine2->{'info'};
649 last if (!exists($info->{'pv' . $mpv}));
651 my $pv = $info->{'pv' . $mpv};
653 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
654 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
655 if (scalar @pretty_pv > 5) {
656 @pretty_pv = @pretty_pv[0..4];
657 push @pretty_pv, "...";
659 my $key = $pretty_move;
660 my $line = sprintf(" %-6s %6s %3s %s",
662 short_score($info, $pos_calculating_second_engine, $mpv),
663 "d" . $info->{'depth' . $mpv},
664 join(', ', @pretty_pv));
665 push @refutation_lines, [ $key, $line ];
670 if ($#refutation_lines >= 0) {
671 $text .= "Shallow search of all legal moves:\n\n";
672 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
673 $text .= $line->[1] . "\n";
678 if ($last_text ne $text) {
679 print "
\e[H
\e[2J"; # clear the screen
686 my $info = $engine->{'info'};
689 $json->{'position'} = $pos_calculating->to_json_hash();
690 $json->{'id'} = $engine->{'id'};
691 $json->{'score'} = long_score($info, $pos_calculating, '');
692 $json->{'short_score'} = short_score($info, $pos_calculating, '');
694 $json->{'nodes'} = $info->{'nodes'};
695 $json->{'nps'} = $info->{'nps'};
696 $json->{'depth'} = $info->{'depth'};
697 $json->{'tbhits'} = $info->{'tbhits'};
698 $json->{'seldepth'} = $info->{'seldepth'};
699 $json->{'tablebase'} = $info->{'tablebase'};
701 # single-PV only for now
702 $json->{'pv_uci'} = $info->{'pv'};
703 $json->{'pv_pretty'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
705 my %refutation_lines = ();
706 my @refutation_lines = ();
707 if (defined($engine2)) {
708 for (my $mpv = 1; $mpv < 500; ++$mpv) {
709 my $info = $engine2->{'info'};
710 my $pretty_move = "";
712 last if (!exists($info->{'pv' . $mpv}));
715 my $pv = $info->{'pv' . $mpv};
716 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
717 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
718 $refutation_lines{$pv->[0]} = {
719 sort_key => $pretty_move,
720 depth => $info->{'depth' . $mpv},
721 score_sort_key => score_sort_key($info, $pos_calculating, $mpv, 0),
722 pretty_score => short_score($info, $pos_calculating, $mpv),
723 pretty_move => $pretty_move,
724 pv_pretty => \@pretty_pv,
726 $refutation_lines{$pv->[0]}->{'pv_uci'} = $pv;
730 $json->{'refutation_lines'} = \%refutation_lines;
732 open my $fh, ">", $remoteglotconf::json_output . ".tmp"
734 print $fh JSON::XS::encode_json($json);
736 rename($remoteglotconf::json_output . ".tmp", $remoteglotconf::json_output);
740 my ($engine, $msg) = @_;
741 $engine->print($msg);
742 print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
746 my ($info, $pos, $mpv) = @_;
748 my $invert = ($pos->{'toplay'} eq 'B');
749 if (defined($info->{'score_mate' . $mpv})) {
751 return sprintf "M%3d", -$info->{'score_mate' . $mpv};
753 return sprintf "M%3d", $info->{'score_mate' . $mpv};
756 if (exists($info->{'score_cp' . $mpv})) {
757 my $score = $info->{'score_cp' . $mpv} * 0.01;
759 if ($info->{'tablebase'}) {
768 return sprintf "%+5.2f", $score;
776 my ($info, $pos, $mpv, $invert) = @_;
778 if (defined($info->{'score_mate' . $mpv})) {
779 my $mate = $info->{'score_mate' . $mpv};
783 $score = 99999 - $mate;
785 # Side to move is getting mated (note the double negative for $mate)
786 $score = -99999 - $mate;
793 if (exists($info->{'score_cp' . $mpv})) {
794 my $score = $info->{'score_cp' . $mpv};
806 my ($info, $pos, $mpv) = @_;
808 if (defined($info->{'score_mate' . $mpv})) {
809 my $mate = $info->{'score_mate' . $mpv};
810 if ($pos->{'toplay'} eq 'B') {
814 return sprintf "White mates in %u", $mate;
816 return sprintf "Black mates in %u", -$mate;
819 if (exists($info->{'score_cp' . $mpv})) {
820 my $score = $info->{'score_cp' . $mpv} * 0.01;
822 if ($info->{'tablebase'}) {
823 return "Theoretical draw";
825 return "Score: 0.00";
828 if ($pos->{'toplay'} eq 'B') {
831 return sprintf "Score: %+5.2f", $score;
840 my ($fen, $board, $toplay) = @_;
842 if (exists($book_cache{$fen})) {
843 return $book_cache{$fen};
846 my $ret = `./booklook $fen`;
847 return "" if ($ret =~ /Not found/ || $ret eq '');
851 for my $m (split /\n/, $ret) {
852 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
856 $pmove = '(current)';
858 ($pmove) = prettyprint_pv_no_cache($board, $move);
859 $pmove .= $annotation;
863 if ($toplay eq 'W') {
864 $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
866 $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
868 my $n = $win + $draw + $lose;
874 $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
877 push @moves, [ $pmove, $n, $percent, $rating ];
880 @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
882 my $text = "Book moves:\n\n Perf. N Rating\n\n";
884 $text .= sprintf " %-10s %s %6u %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
890 sub schedule_tb_lookup {
891 return if (!defined($remoteglotconf::tb_serial_key));
892 my $pos = $pos_waiting // $pos_calculating;
893 return if (exists($tb_cache{$pos->fen()}));
895 # If there's more than seven pieces, there's not going to be an answer,
897 return if ($pos->num_pieces() > 7);
899 # Max one at a time. If it's still relevant when it returns,
900 # schedule_tb_lookup() will be called again.
901 return if ($tb_lookup_running);
903 $tb_lookup_running = 1;
904 my $url = 'http://158.250.18.203:6904/tasks/addtask?auth.login=' .
905 $remoteglotconf::tb_serial_key .
906 '&auth.password=aquarium&type=0&fen=' .
907 URI::Escape::uri_escape($pos->fen());
908 print TBLOG "Downloading $url...\n";
909 AnyEvent::HTTP::http_get($url, sub {
910 handle_tb_lookup_return(@_, $pos, $pos->fen());
914 sub handle_tb_lookup_return {
915 my ($body, $header, $pos, $fen) = @_;
916 print TBLOG "Response for [$fen]:\n";
917 print TBLOG $header . "\n\n";
918 print TBLOG $body . "\n\n";
920 my $response = JSON::XS::decode_json($body);
921 if ($response->{'ErrorCode'} != 0) {
922 die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
924 my $state = $response->{'Response'}{'StateString'};
925 if ($state eq 'COMPLETE') {
926 my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
927 if (!defined($pgn) || !$pgn->read_game()) {
928 warn "Error in parsing PGN\n";
930 $pgn->quick_parse_game;
932 my $moves = $pgn->moves;
934 for my $move (@$moves) {
936 ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
937 push @uci_moves, $uci_move;
940 result => $pgn->result,
945 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
946 # Try again in a second. Note that if we have changed
947 # position in the meantime, we might query a completely
948 # different position! But that's fine.
950 die "Unknown response state " . $state;
953 # Wait a second before we schedule another one.
954 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
955 $tb_lookup_running = 0;
956 schedule_tb_lookup();
960 warn "Error in tablebase lookup: $@";
962 # Don't try this one again, but don't block new lookups either.
963 $tb_lookup_running = 0;
968 my ($cmdline, $tag, $cb) = @_;
969 return undef if (!defined($cmdline));
970 return Engine->open($cmdline, $tag, $cb);
973 sub col_letter_to_num {
974 return ord(shift) - ord('a');
977 sub row_letter_to_num {
978 return 7 - (ord(shift) - ord('1'));
983 my $from_col = col_letter_to_num(substr($move, 0, 1));
984 my $from_row = row_letter_to_num(substr($move, 1, 1));
985 my $to_col = col_letter_to_num(substr($move, 2, 1));
986 my $to_row = row_letter_to_num(substr($move, 3, 1));
987 my $promo = substr($move, 4, 1);
988 return ($from_col, $from_row, $to_col, $to_row, $promo);