[PATCH] search: move query transform + enquire setup out of retry loop

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

The Xapian query transformation and Enquire object setup aren't
subject to MVCC and retries, so move it outside the retry loop
to save some cycles in case we need to retry on a busy DB.
---
 lib/PublicInbox/Search.pm | 80 +++++++++++++++++++--------------------
 1 file changed, 38 insertions(+), 42 deletions(-)

diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index 273cc57c..7f470f29 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -390,11 +390,43 @@ sub query_approxidate {
 
 # read-only
 sub mset {
-	my ($self, $query_string, $opts) = @_;
-	$opts ||= {};
+	my ($self, $query_string, $opt) = @_;
+	$opt ||= {};
 	my $qp = $self->{qp} //= $self->qparse_new;
 	my $query = $qp->parse_query($query_string, $self->{qp_flags});
-	_do_enquire($self, $query, $opts);
+	if (defined(my $eidx_key = $opt->{eidx_key})) {
+		$query = $X{Query}->new(OP_FILTER(), $query, 'O'.$eidx_key);
+	}
+	if (defined(my $uid_range = $opt->{uid_range})) {
+		my $range = $X{Query}->new(OP_VALUE_RANGE(), UID,
+					sortable_serialise($uid_range->[0]),
+					sortable_serialise($uid_range->[1]));
+		$query = $X{Query}->new(OP_FILTER(), $query, $range);
+	}
+	my $xdb = xdb($self);
+	my $enq = $X{Enquire}->new($xdb);
+	$enq->set_query($query);
+	$opt ||= {};
+	my $rel = $opt->{relevance} // 0;
+	if ($rel == -2) { # ORDER BY docid/UID (highest first)
+		$enq->set_weighting_scheme($X{BoolWeight}->new);
+		$enq->set_docid_order($ENQ_DESCENDING);
+	} elsif ($rel == -1) { # ORDER BY docid/UID (lowest first)
+		$enq->set_weighting_scheme($X{BoolWeight}->new);
+		$enq->set_docid_order($ENQ_ASCENDING);
+	} elsif ($rel == 0) {
+		$enq->set_sort_by_value_then_relevance(TS, !$opt->{asc});
+	} else { # rel > 0
+		$enq->set_sort_by_relevance_then_value(TS, !$opt->{asc});
+	}
+
+	# `lei q -t / --threads' or JMAP collapseThreads; but don't collapse
+	# on `-tt' ({threads} > 1) which sets the Flagged|Important keyword
+	if (($opt->{threads} // 0) == 1 && has_threadid($self)) {
+		$enq->set_collapse_key(THREADID);
+	}
+	retry_reopen($self, \&enquire_once, $enq,
+			$opt->{offset} || 0, $opt->{limit} || 50);
 }
 
 sub retry_reopen {
@@ -421,51 +453,15 @@ sub retry_reopen {
 	Carp::croak("Too many Xapian database modifications in progress\n");
 }
 
-sub _do_enquire {
-	my ($self, $query, $opts) = @_;
-	retry_reopen($self, \&_enquire_once, $query, $opts);
-}
-
 # returns true if all docs have the THREADID value
 sub has_threadid ($) {
 	my ($self) = @_;
 	(xdb($self)->get_metadata('has_threadid') // '') eq '1';
 }
 
-sub _enquire_once { # retry_reopen callback
-	my ($self, $query, $opts) = @_;
-	my $xdb = xdb($self);
-	if (defined(my $eidx_key = $opts->{eidx_key})) {
-		$query = $X{Query}->new(OP_FILTER(), $query, 'O'.$eidx_key);
-	}
-	if (defined(my $uid_range = $opts->{uid_range})) {
-		my $range = $X{Query}->new(OP_VALUE_RANGE(), UID,
-					sortable_serialise($uid_range->[0]),
-					sortable_serialise($uid_range->[1]));
-		$query = $X{Query}->new(OP_FILTER(), $query, $range);
-	}
-	my $enquire = $X{Enquire}->new($xdb);
-	$enquire->set_query($query);
-	$opts ||= {};
-	my $rel = $opts->{relevance} // 0;
-	if ($rel == -2) { # ORDER BY docid/UID (highest first)
-		$enquire->set_weighting_scheme($X{BoolWeight}->new);
-		$enquire->set_docid_order($ENQ_DESCENDING);
-	} elsif ($rel == -1) { # ORDER BY docid/UID (lowest first)
-		$enquire->set_weighting_scheme($X{BoolWeight}->new);
-		$enquire->set_docid_order($ENQ_ASCENDING);
-	} elsif ($rel == 0) {
-		$enquire->set_sort_by_value_then_relevance(TS, !$opts->{asc});
-	} else { # rel > 0
-		$enquire->set_sort_by_relevance_then_value(TS, !$opts->{asc});
-	}
-
-	# `lei q -t / --threads' or JMAP collapseThreads; but don't collapse
-	# on `-tt' ({threads} > 1) which sets the Flagged|Important keyword
-	if (($opts->{threads} // 0) == 1 && has_threadid($self)) {
-		$enquire->set_collapse_key(THREADID);
-	}
-	$enquire->get_mset($opts->{offset} || 0, $opts->{limit} || 50);
+sub enquire_once { # retry_reopen callback
+	my (undef, $enq, $offset, $limit) = @_;
+	$enq->get_mset($offset, $limit);
 }
 
 sub mset_to_smsg {