From 2d3fc25afe7435992236ac143039b24248c5e74d Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Sat, 28 Nov 2020 05:09:15 +0000
Subject: nntp: XPATH uses ->ALL extindex, too

Another 30-40% speedup when testing against a local
lore.kernel.org mirror.  In either case, we'll consistently sort
the response for ease-of-testing and client-side
cache-friendliness.
---
 lib/PublicInbox/NNTP.pm | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

(limited to 'lib/PublicInbox/NNTP.pm')

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index c014eff0..d314a3d1 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -994,12 +994,28 @@ sub cmd_xpath ($$) {
 	return r501 unless $mid =~ $ONE_MSGID;
 	$mid = $1;
 	my @paths;
-	foreach my $ng (values %{$self->{nntpd}->{groups}}) {
-		my $n = $ng->mm->num_for($mid);
-		push @paths, "$ng->{newsgroup}/$n" if defined $n;
+	my $pi_cfg = $self->{nntpd}->{pi_config};
+	my $groups = $pi_cfg->{-by_newsgroup};
+	if (my $ALL = $pi_cfg->ALL) {
+		my ($id, $prev, %seen);
+		while (my $smsg = $ALL->over->next_by_mid($mid, \$id, \$prev)) {
+			my $xr3 = $ALL->over->get_xref3($smsg->{num});
+			for my $x (@$xr3) {
+				my ($ngname, $n) = split(/:/, $x);
+				$x = "$ngname/$n";
+				if ($groups->{$ngname} && !$seen{$x}++) {
+					push(@paths, $x);
+				}
+			}
+		}
+	} else { # slow path, no point in using long_response
+		for my $ibx (values %$groups) {
+			my $n = $ibx->mm->num_for($mid) // next;
+			push @paths, "$ibx->{newsgroup}/$n";
+		}
 	}
 	return '430 no such article on server' unless @paths;
-	'223 '.join(' ', @paths);
+	'223 '.join(' ', sort(@paths));
 }
 
 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
-- 
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