[PATCH 2/2] searchmsg: remove ensure_metadata

[Eric Wong <e@80x24.org>]

Instead, only preload the ->mid field for threading,
as we only need ->thread and ->path once in Search->get_thread
(but we will need the ->mid field repeatedly).

This more than doubles View->load_results performance on
according to thread-all on an inbox with over 300K messages.
---
 lib/PublicInbox/Search.pm    |  6 ------
 lib/PublicInbox/SearchMsg.pm | 39 ++++++++++++---------------------------
 lib/PublicInbox/View.pm      |  2 +-
 t/search.t                   |  2 --
 4 files changed, 13 insertions(+), 36 deletions(-)

diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index 24cb266..d4f6f77 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -108,12 +108,6 @@ my %all_pfx = (%bool_pfx_internal, %bool_pfx_external, %prob_prefix);
 
 sub xpfx { $all_pfx{$_[0]} }
 
-our %PFX2TERM_RMAP;
-my %meta_pfx = (mid => 1, thread => 1, path => 1);
-while (my ($k, $v) = each %all_pfx) {
-	$PFX2TERM_RMAP{$v} = $k if $meta_pfx{$k};
-}
-
 my $mail_query = Search::Xapian::Query->new(xpfx('type') . 'mail');
 
 sub xdir {
diff --git a/lib/PublicInbox/SearchMsg.pm b/lib/PublicInbox/SearchMsg.pm
index d62f02c..96406c6 100644
--- a/lib/PublicInbox/SearchMsg.pm
+++ b/lib/PublicInbox/SearchMsg.pm
@@ -10,7 +10,6 @@ use Search::Xapian;
 use Date::Parse qw/str2time/;
 use PublicInbox::MID qw/mid_clean/;
 use PublicInbox::Address;
-our $PFX2TERM_RE = undef;
 
 sub new {
 	my ($class, $mime) = @_;
@@ -121,29 +120,17 @@ sub references {
 	defined $x ? $x : '';
 }
 
-sub ensure_metadata {
-	my ($self) = @_;
+sub _get_term_val ($$$) {
+	my ($self, $pfx, $re) = @_;
 	my $doc = $self->{doc};
 	my $end = $doc->termlist_end;
-
-	unless (defined $PFX2TERM_RE) {
-		my $or = join('|', keys %PublicInbox::Search::PFX2TERM_RMAP);
-		$PFX2TERM_RE = qr/\A($or)/;
-	}
-
-	while (my ($pfx, $field) = each %PublicInbox::Search::PFX2TERM_RMAP) {
-		# ideally we'd move this out of the loop:
-		my $i = $doc->termlist_begin;
-
-		$i->skip_to($pfx);
-		if ($i != $end) {
-			my $val = $i->get_termname;
-
-			if ($val =~ s/$PFX2TERM_RE//o) {
-				$self->{$field} = $val;
-			}
-		}
+	my $i = $doc->termlist_begin;
+	$i->skip_to($pfx);
+	if ($i != $end) {
+		my $val = $i->get_termname;
+		$val =~ s/$re// and return $val;
 	}
+	undef;
 }
 
 sub mid ($;$) {
@@ -154,8 +141,8 @@ sub mid ($;$) {
 	} elsif (my $rv = $self->{mid}) {
 		$rv;
 	} else {
-		$self->ensure_metadata; # needed for ghosts
-		$self->{mid} ||= $self->_extract_mid;
+		$self->{mid} = _get_term_val($self, 'Q', qr/\AQ/) ||
+				$self->_extract_mid;
 	}
 }
 
@@ -194,16 +181,14 @@ sub thread_id {
 	my ($self) = @_;
 	my $tid = $self->{thread};
 	return $tid if defined $tid;
-	$self->ensure_metadata;
-	$self->{thread};
+	$self->{thread} = _get_term_val($self, 'G', qr/\AG/); # *G*roup
 }
 
 sub path {
 	my ($self) = @_;
 	my $path = $self->{path};
 	return $path if defined $path;
-	$self->ensure_metadata;
-	$self->{path};
+	$self->{path} = _get_term_val($self, 'XPATH', qr/\AXPATH/); # path
 }
 
 1;
diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index fa47a16..a50cb64 100644
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -737,7 +737,7 @@ sub indent_for {
 sub load_results {
 	my ($srch, $sres) = @_;
 	my $msgs = delete $sres->{msgs};
-	$srch->retry_reopen(sub { [ map { $_->ensure_metadata; $_ } @$msgs ] });
+	$srch->retry_reopen(sub { [ map { $_->mid; $_ } @$msgs ] });
 }
 
 sub msg_timestamp {
diff --git a/t/search.t b/t/search.t
index eed9c9b..c16811d 100644
--- a/t/search.t
+++ b/t/search.t
@@ -109,7 +109,6 @@ sub filter_mids {
 	my $found = $ro->lookup_message('<root@s>');
 	ok($found, "message found");
 	is($root_id, $found->{doc_id}, 'doc_id set correctly');
-	$found->ensure_metadata;
 	is($found->mid, 'root@s', 'mid set correctly');
 	ok(int($found->thread_id) > 0, 'thread_id is an integer');
 
@@ -290,7 +289,6 @@ sub filter_mids {
 		body => "LOOP!\n"));
 	ok($doc_id > 0, "doc_id defined with circular reference");
 	my $smsg = $rw->lookup_message('circle@a');
-	$smsg->ensure_metadata;
 	is($smsg->references, '', "no references created");
 	my $msg = PublicInbox::SearchMsg->load_doc($smsg->{doc});
 	is($s, $msg->subject, 'long subject not rewritten');
-- 
EW