1 files changed, 72 insertions, 0 deletions
diff --git a/lib/PublicInbox/LeiXSearch.pm b/lib/PublicInbox/LeiXSearch.pm
new file mode 100644
index 00000000..1a81b14a
--- /dev/null
+++ b/lib/PublicInbox/LeiXSearch.pm
@@ -0,0 +1,72 @@
+# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# Combine any combination of PublicInbox::Search,
+# PublicInbox::ExtSearch, and PublicInbox::LeiSearch objects
+# into one Xapian DB
+package PublicInbox::LeiXSearch;
+use strict;
+use v5.10.1;
+use parent qw(PublicInbox::LeiSearch);
+
+sub new {
+        my ($class) = @_;
+        PublicInbox::Search::load_xapian();
+        bless {
+                qp_flags => $PublicInbox::Search::QP_FLAGS |
+                                PublicInbox::Search::FLAG_PURE_NOT(),
+        }, $class
+}
+
+sub attach_extinbox {
+        my ($self, $ibxish) = @_; # ibxish = ExtSearch or Inbox
+        if (!$ibxish->can('over')) {
+                push @{$self->{remotes}}, $ibxish
+        }
+        if (delete $self->{xdb}) { # XXX: do we need this?
+                # clobber existing {xdb} if amending
+                my $expect = delete $self->{nshard};
+                my $shards = delete $self->{shards_flat};
+                scalar(@$shards) == $expect or die
+                        "BUG: {nshard}$expect != shards=".scalar(@$shards);
+
+                my $prev = {};
+                for my $old_ibxish (@{$self->{shard2ibx}}) {
+                        next if $prev == $old_ibxish;
+                        $prev = $old_ibxish;
+                        my @shards = $old_ibxish->search->xdb_shards_flat;
+                        push @{$self->{shards_flat}}, @shards;
+                }
+                my $nr = scalar(@{$self->{shards_flat}});
+                $nr == $expect or die
+                        "BUG: reloaded $nr shards, expected $expect"
+        }
+        my @shards = $ibxish->search->xdb_shards_flat;
+        push @{$self->{shards_flat}}, @shards;
+        push(@{$self->{shard2ibx}}, $ibxish) for (@shards);
+}
+
+# called by PublicInbox::Search::xdb
+sub xdb_shards_flat { @{$_[0]->{shards_flat}} }
+
+# like over->get_art
+sub smsg_for {
+        my ($self, $mitem) = @_;
+        # cf. https://trac.xapian.org/wiki/FAQ/MultiDatabaseDocumentID
+        my $nshard = $self->{nshard};
+        my $docid = $mitem->get_docid;
+        my $shard = ($docid - 1) % $nshard;
+        my $num = int(($docid - 1) / $nshard) + 1;
+        my $smsg = $self->{shard2ibx}->[$shard]->over->get_art($num);
+        $smsg->{docid} = $docid;
+        $smsg;
+}
+
+sub recent {
+        my ($self, $qstr, $opt) = @_;
+        $opt //= {};
+        $opt->{relevance} //= -2;
+        $self->mset($qstr //= 'bytes:1..', $opt);
+}
+
+1;