X-Git-Url: https://git.sesse.net/?p=remoteglot;a=blobdiff_plain;f=remoteglot.pl;h=5982ecad214a65b4b6613efdeb90295eaf907dc2;hp=4ccdac7e4b873d69143194795f2e6f71e0715806;hb=b3460eff1614aaa74a09a581f04edb8722c87667;hpb=ad566e0ccb947e1c2e3e81580edacaf88765701b

diff --git a/remoteglot.pl b/remoteglot.pl
index 4ccdac7..5982eca 100755
--- a/remoteglot.pl
+++ b/remoteglot.pl
@@ -93,8 +93,6 @@ $t->cmd("");
 $t->cmd("set shout 0");
 $t->cmd("set seek 0");
 $t->cmd("set style 12");
-$t->cmd("observe $remoteglotconf::target");
-print "FICS ready.\n";
 
 my $ev1 = AnyEvent->io(
 	fh => fileno($t),
@@ -110,6 +108,15 @@ my $ev1 = AnyEvent->io(
 		}
 	}
 );
+if (defined($remoteglotconf::target)) {
+	if ($remoteglotconf::target =~ /^http:/) {
+		fetch_pgn($remoteglotconf::target);
+	} else {
+		$t->cmd("observe $remoteglotconf::target");
+	}
+}
+print "FICS ready.\n";
+
 # Engine events have already been set up by Engine.pm.
 EV::run;
 
@@ -172,9 +179,7 @@ sub handle_fics {
 		} elsif ($msg =~ /^pgn (.*?)$/) {
 			my $url = $1;
 			$t->cmd("tell $who Starting to poll '$url'.");
-			AnyEvent::HTTP::http_get($url, sub {
-				handle_pgn(@_, $url);
-			});
+			fetch_pgn($url);
 		} elsif ($msg =~ /^stoppgn$/) {
 			$t->cmd("tell $who Stopping poll.");
 			$http_timer = undef;
@@ -188,6 +193,18 @@ sub handle_fics {
 	#print "FICS: [$line]\n";
 }
 
+# Starts periodic fetching of PGNs from the given URL.
+sub fetch_pgn {
+	my ($url) = @_;
+	AnyEvent::HTTP::http_get($url, sub {
+		handle_pgn(@_, $url);
+	});
+}
+
+my ($last_pgn_white, $last_pgn_black);
+my @last_pgn_uci_moves = ();
+my $pgn_hysteresis_counter = 0;
+
 sub handle_pgn {
 	my ($body, $header, $url) = @_;
 	my $pgn = Chess::PGN::Parse->new(undef, $body);
@@ -205,13 +222,31 @@ sub handle_pgn {
 		}
 		$pos->{'history'} = \@uci_moves;
 		$pos->{'pretty_history'} = $moves;
-		handle_position($pos);
+
+		# Sometimes, PGNs lose a move or two for a short while,
+		# or people push out new ones non-atomically. 
+		# Thus, if we PGN doesn't change names but becomes
+		# shorter, we mistrust it for a few seconds.
+		my $trust_pgn = 1;
+		if (defined($last_pgn_white) && defined($last_pgn_black) &&
+		    $last_pgn_white eq $pgn->white &&
+		    $last_pgn_black eq $pgn->black &&
+		    scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
+			if (++$pgn_hysteresis_counter < 3) {
+				$trust_pgn = 0;	
+			}
+		}
+		if ($trust_pgn) {
+			$last_pgn_white = $pgn->white;
+			$last_pgn_black = $pgn->black;
+			@last_pgn_uci_moves = @uci_moves;
+			$pgn_hysteresis_counter = 0;
+			handle_position($pos);
+		}
 	}
 	
 	$http_timer = AnyEvent->timer(after => 1.0, cb => sub {
-		AnyEvent::HTTP::http_get($url, sub {
-			handle_pgn(@_, $url);
-		});
+		fetch_pgn($url);
 	});
 }