From c8870e1233f5312561b50997ee693ac2a4be58bb Mon Sep 17 00:00:00 2001
From: Peter Palfrader <peter@palfrader.org>
Date: Fri, 28 Feb 2003 18:02:31 +0000
Subject: Summarize bad chains (i.e. have (foo *) if needed)

---
 Echolot/Config.pm  |  3 ++-
 Echolot/Stats.pm   | 57 ++++++++++++++++++++++++++++++++++++++++++++++++------
 doc/pingd.conf.pod |  6 ++++++
 3 files changed, 59 insertions(+), 7 deletions(-)

diff --git a/Echolot/Config.pm b/Echolot/Config.pm
index c64f295..6b1be41 100644
--- a/Echolot/Config.pm
+++ b/Echolot/Config.pm
@@ -1,7 +1,7 @@
 package Echolot::Config;
 
 # (c) 2002 Peter Palfrader <peter@palfrader.org>
-# $Id: Config.pm,v 1.61 2003/02/20 19:39:03 weasel Exp $
+# $Id: Config.pm,v 1.62 2003/02/28 18:02:31 weasel Exp $
 #
 
 =pod
@@ -111,6 +111,7 @@ sub init($) {
 		chainping_grace             => 1.5, # don't count pings sent no longer than 1.5 * (lat1 + lat2) ago
 		chainping_update            => 4*60*60, # chain stats should never be older than 4 hours
 		chainping_minsample         => 3, # have at least sent 3 pings before judging any chain
+		chainping_allbad_factor     => 0.5, # at least 50% of possible chains (A x) need to fail for (A *) to be listed in broken chains
 
 		addresses_default_ttl       => 5, # getkeyconf seconds (days)
 		check_resurrection_ttl      => 8, # check_resurrection seconds (weeks)
diff --git a/Echolot/Stats.pm b/Echolot/Stats.pm
index 7316af3..0002ea8 100644
--- a/Echolot/Stats.pm
+++ b/Echolot/Stats.pm
@@ -1,7 +1,7 @@
 package Echolot::Stats;
 
 # (c) 2002 Peter Palfrader <peter@palfrader.org>
-# $Id: Stats.pm,v 1.51 2003/02/20 17:02:38 weasel Exp $
+# $Id: Stats.pm,v 1.52 2003/02/28 18:02:31 weasel Exp $
 #
 
 =pod
@@ -476,6 +476,54 @@ sub build_rems($) {
 	return \@rems;
 };
 
+sub compress_broken_chain($@) {
+	my ($num, @list) = @_;
+
+	my %unique = ();
+	@list = sort { $a cmp $b} grep { ! $unique{$_}++; } @list;
+
+	my %bad_left;
+	my %bad_right;
+	for my $chain (@list) {
+		chomp;
+		my ($left, $right) = $chain =~ m/\((\S+) \s (\S+)\)/x or
+			Echolot::Log::warn("Could not parse bad chain '$chain'."),
+			next;
+		$bad_right{$right}++;
+		$bad_right{$right} += $num if ($left  eq '*');
+		$bad_left {$left }++;
+		$bad_left {$left } += $num if ($right eq '*');
+	};
+
+
+	my $threshold = $num * Echolot::Config::get()->{'chainping_allbad_factor'};
+	my @result = ();
+	for my $key (keys %bad_right) {
+		delete $bad_right{$key}, next if $bad_right{$key} < $threshold;
+		push @result, "(* $key)";
+	};
+	for my $key (keys %bad_left) {
+		delete $bad_left{$key}, next if $bad_left{$key} < $threshold;
+		push @result, "($key *)";
+	};
+
+	for my $chain (@list) {
+		chomp;
+		my ($left, $right) = $chain =~ m/\((\S+) \s (\S+)\)/x or
+			# Echolot::Log::warn("Could not parse bad chain '$chain'."),    -- don't warn again
+			push(@result, $chain),
+			next;
+		next if defined $bad_right{$right};
+		next if defined $bad_left {$left };
+		push(@result, $chain),
+	};
+
+	%unique = ();
+	@result = sort { $a cmp $b} grep { ! $unique{$_}++; } @result;
+
+	return @list;
+};
+
 sub find_broken_chains($$$) {
 	my ($chaintype, $rems, $hard) = @_;
 
@@ -560,11 +608,8 @@ sub find_broken_chains($$$) {
 	push @pub,  map { $_->{'chain'} } grep { $_->{'public'} } @{ $BROKEN_CHAINS{$chaintype} };
 	push @priv, map { $_->{'chain'} }                         @{ $BROKEN_CHAINS{$chaintype} };
 
-	my %unique;
-	%unique = ();
-	my $pub  = join "\n", sort { $a cmp $b} grep { ! $unique{$_}++; } @pub;
-	%unique = ();
-	my $priv = join "\n", sort { $a cmp $b} grep { ! $unique{$_}++; } @priv;
+	my $pub = join "\n", compress_broken_chain(scalar @$rems, @pub);
+	my $priv = join "\n", compress_broken_chain(scalar @$rems, @priv);
 
 	return ($pub, $priv);
 };
diff --git a/doc/pingd.conf.pod b/doc/pingd.conf.pod
index 851569f..a5a2464 100644
--- a/doc/pingd.conf.pod
+++ b/doc/pingd.conf.pod
@@ -701,6 +701,12 @@ declaring a chain broken.
 
 	Default: 'chainping_minsample' => 3, # have at least sent 3 pings before judging any chain
 
+=item B<chainping_allbad_factor>
+
+How many chains C<(A x)> must be bad before C<(A *)> is listed.
+The amount is given as factor of all available remailers.
+
+	Default: chainping_allbad_factor => 0.5, # at least 50% of possible chains (A x) need to fail for (A *) to be listed in broken chains
 
 =back
 
-- 
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