[PATCH 10/12] extmsg: remove expensive git path checks

["Eric Wong (Contractor, The Linux Foundation)" <e@80x24.org>]

Searching across different inboxes is expensive without
SQLite (or Xapian) installed, so avoid doing expensive tree
lookups in git.  Since SQLite is required for Xapian
support anyways, we won't need to check Xapian, either.

Sites without SQLite installed will simply 404 if somebody
requests a message which isn't in the current inbox.
---
 lib/PublicInbox/ExtMsg.pm | 39 +++++++--------------------------------
 lib/PublicInbox/Inbox.pm  |  5 -----
 2 files changed, 7 insertions(+), 37 deletions(-)

diff --git a/lib/PublicInbox/ExtMsg.pm b/lib/PublicInbox/ExtMsg.pm
index c71510f..a6f516d 100644
--- a/lib/PublicInbox/ExtMsg.pm
+++ b/lib/PublicInbox/ExtMsg.pm
@@ -31,30 +31,19 @@ sub ext_msg {
 	my $cur = $ctx->{-inbox};
 	my $mid = $ctx->{mid};
 
-	eval { require PublicInbox::Search };
-	my $have_xap = $@ ? 0 : 1;
-	my (@nox, @ibx, @found);
+	eval { require PublicInbox::Msgmap };
+	my $have_mm = $@ ? 0 : 1;
+	my (@ibx, @found);
 
 	$ctx->{www}->{pi_config}->each_inbox(sub {
 		my ($other) = @_;
 		return if $other->{name} eq $cur->{name} || !$other->base_url;
 
-		my $s = $other->search;
-		if (!$s) {
-			push @nox, $other;
-			return;
-		}
-
-		# try to find the URL with Xapian to avoid forking
-		my $doc_id = eval { $s->find_first_doc_id('Q' . $mid) };
-		if ($@) {
-			# xapian not configured properly for this repo
-			push @nox, $other;
-			return;
-		}
+		my $mm = $other->mm or return;
 
-		# maybe we found it!
-		if (defined $doc_id) {
+		# try to find the URL with Msgmap to avoid forking
+		my $num = $mm->num_for($mid);
+		if (defined $num) {
 			push @found, $other;
 		} else {
 			# no point in trying the fork fallback if we
@@ -66,20 +55,6 @@ sub ext_msg {
 
 	return exact($ctx, \@found, $mid) if @found;
 
-	# Xapian not installed or configured for some repos,
-	# do a full MID check (this is expensive...):
-	if (@nox) {
-		my $path = mid2path($mid);
-		foreach my $other (@nox) {
-			my (undef, $type, undef) = $other->path_check($path);
-
-			if ($type && $type eq 'blob') {
-				push @found, $other;
-			}
-		}
-	}
-	return exact($ctx, \@found, $mid) if @found;
-
 	# fall back to partial MID matching
 	my $n_partial = 0;
 	my @partial;
diff --git a/lib/PublicInbox/Inbox.pm b/lib/PublicInbox/Inbox.pm
index f71493a..706089c 100644
--- a/lib/PublicInbox/Inbox.pm
+++ b/lib/PublicInbox/Inbox.pm
@@ -290,11 +290,6 @@ sub smsg_mime {
 	}
 }
 
-sub path_check {
-	my ($self, $path) = @_;
-	git($self)->check('HEAD:'.$path);
-}
-
 sub mid2num($$) {
 	my ($self, $mid) = @_;
 	my $mm = mm($self) or return;
-- 
EW