# Copyright (C) 2020-2021 all contributors
# License: AGPL-3.0+
# 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 PublicInbox::IPC);
use Sys::Syslog qw(syslog);
sub new {
my ($class) = @_;
PublicInbox::Search::load_xapian();
bless {
qp_flags => $PublicInbox::Search::QP_FLAGS |
PublicInbox::Search::FLAG_PURE_NOT(),
}, $class
}
sub attach_external {
my ($self, $ibxish) = @_; # ibxish = ExtSearch or Inbox
if (!$ibxish->can('over') || !$ibxish->over) {
return push(@{$self->{remotes}}, $ibxish)
}
my $desc = $ibxish->{inboxdir} // $ibxish->{topdir};
my $srch = $ibxish->search or
return warn("$desc not indexed for Xapian\n");
my @shards = $srch->xdb_shards_flat or
return warn("$desc has no Xapian shardsXapian\n");
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 $expect"
}
push @{$self->{shards_flat}}, @shards;
push(@{$self->{shard2ibx}}, $ibxish) for (@shards);
}
# returns a list of local inboxes (or count in scalar context)
sub locals {
my %uniq = map {; "$_" => $_ } @{$_[0]->{shard2ibx} // []};
values %uniq;
}
# 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);
}
sub over {}
sub _mset_more ($$) {
my ($mset, $mo) = @_;
my $size = $mset->size;
$size && (($mo->{offset} += $size) < ($mo->{limit} // 10000));
}
sub query_thread_mset { # for --thread
my ($self, $lei, $ibxish) = @_;
local %SIG = (%SIG, $lei->atfork_child_wq($self));
my ($srch, $over) = ($ibxish->search, $ibxish->over);
unless ($srch && $over) {
my $desc = $ibxish->{inboxdir} // $ibxish->{topdir};
warn "$desc not indexed by Xapian\n";
return;
}
my $mo = { %{$lei->{mset_opt}} };
my $mset;
my $each_smsg = $lei->{ovv}->ovv_each_smsg_cb($lei);
do {
$mset = $srch->mset($mo->{qstr}, $mo);
my $ids = $srch->mset_to_artnums($mset, $mo);
my $ctx = { ids => $ids };
my $i = 0;
my %n2item = map { ($ids->[$i++], $_) } $mset->items;
while ($over->expand_thread($ctx)) {
for my $n (@{$ctx->{xids}}) {
my $smsg = $over->get_art($n) or next;
# next if $dd->is_smsg_dup($smsg); TODO
my $mitem = delete $n2item{$smsg->{num}};
$each_smsg->($smsg, $mitem);
# $self->out($buf .= $ORS);
# $emit_cb->($smsg);
}
@{$ctx->{xids}} = ();
}
} while (_mset_more($mset, $mo));
$lei->{ovv}->ovv_atexit_child($lei);
}
sub query_mset { # non-parallel for non-"--thread" users
my ($self, $lei, $srcs) = @_;
my $mo = { %{$lei->{mset_opt}} };
my $mset;
local %SIG = (%SIG, $lei->atfork_child_wq($self));
$self->attach_external($_) for @$srcs;
my $each_smsg = $lei->{ovv}->ovv_each_smsg_cb($lei);
do {
$mset = $self->mset($mo->{qstr}, $mo);
for my $it ($mset->items) {
my $smsg = smsg_for($self, $it) or next;
# next if $dd->is_smsg_dup($smsg);
$each_smsg->($smsg, $it);
# $self->out($buf .= $ORS) if defined $buf;
#$emit_cb->($smsg);
}
} while (_mset_more($mset, $mo));
$lei->{ovv}->ovv_atexit_child($lei);
}
sub do_query {
my ($self, $lei_orig, $qry_done, $srcs) = @_;
my ($lei, @io) = $lei_orig->atfork_parent_wq($self);
$io[0] = $qry_done; # don't need stdin
$io[1]->autoflush(1);
$io[2]->autoflush(1);
if ($lei->{opt}->{thread}) {
for my $ibxish (@$srcs) {
$self->wq_do('query_thread_mset', \@io, $lei, $ibxish);
}
} else {
$self->wq_do('query_mset', \@io, $lei, $srcs);
}
# TODO
for my $rmt (@{$self->{remotes} // []}) {
$self->wq_do('query_thread_mbox', \@io, $lei, $rmt);
}
# sent off to children, they will drop remaining references to it
close $qry_done;
}
sub ipc_atfork_child {
my ($self) = @_;
$SIG{__WARN__} = sub { syslog('warning', "@_") };
$self->SUPER::ipc_atfork_child; # PublicInbox::IPC
}
sub ipc_atfork_prepare {
my ($self) = @_;
$self->wq_set_recv_modes(qw[+<&= >&= >&= +<&=]);
$self->SUPER::ipc_atfork_prepare; # PublicInbox::IPC
}
1;