sharedkv: lock and explicitly disconnect {dbh}

It may be possible for updates or changes to be uncommitted
until disconnect, so we'll use flock() as we do elsewhere
to avoid the polling retry behavior of SQLite.

We also need to clear CachedKids before disconnecting to
to avoid warnings like:

  ->disconnect invalidates 1 active statement handle
  (either destroy statement handles or call finish on
  them before disconnecting)

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/PublicInbox/SharedKV.pm b/lib/PublicInbox/SharedKV.pm
index f5d09cc1..77df0fb4 100644
--- a/lib/PublicInbox/SharedKV.pm
+++ b/lib/PublicInbox/SharedKV.pm
@@ -143,9 +143,17 @@ SELECT COUNT(k) FROM kv
         $sth->fetchrow_array;
 }
 
+sub dbh_release {
+        my ($self, $lock) = @_;
+        my $dbh = delete $self->{dbh} or return;
+        $lock //= $self->lock_for_scope; # may be needed for WAL
+        %{$dbh->{CachedKids}} = (); # cleanup prepare_cached
+        $dbh->disconnect;
+}
+
 sub DESTROY {
         my ($self) = @_;
-        delete $self->{dbh};
+        dbh_release($self);
         my $dir = delete $self->{"tmp$$.$self"} or return;
         my $tries = 0;
         do {