/usr/lib/x86_64-linux-gnu/perl5/5.22/MongoDB/Role/_ReadPrefModifier.pm is in libmongodb-perl 1.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright 2014 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
package MongoDB::Role::_ReadPrefModifier;
# MongoDB interface for read ops that respect read preference
# Only affects MongoDB::_Op::_Query on the legacy code path
use version;
our $VERSION = 'v1.2.2';
use Moo::Role;
use MongoDB::Error;
use namespace::clean;
requires qw/read_preference/;
sub _apply_read_prefs {
my ( $self, $link, $topology_type, $query_flags, $query_ref ) = @_;
$topology_type ||= "<undef>";
my $read_pref = $self->read_preference;
if ( $topology_type eq 'Single' ) {
if ( $link->server && $link->server->type eq 'Mongos' ) {
$self->_apply_mongos_read_prefs($read_pref);
}
else {
$query_flags->{slave_ok} = 1;
}
}
elsif ( grep { $topology_type eq $_ } qw/ReplicaSetNoPrimary ReplicaSetWithPrimary/ ) {
if ( !$read_pref || $read_pref->mode eq 'primary' ) {
$query_flags->{slave_ok} = 0;
}
else {
$query_flags->{slave_ok} = 1;
}
}
elsif ( $topology_type eq 'Sharded' ) {
$self->_apply_mongos_read_prefs($read_pref, $query_flags, $query_ref);
}
else {
MongoDB::InternalError->throw("can't query topology type '$topology_type'");
}
return;
}
sub _apply_mongos_read_prefs {
my ( $self, $read_pref, $query_flags, $query_ref ) = @_;
my $mode = $read_pref ? $read_pref->mode : 'primary';
my $need_read_pref;
if ( $mode eq 'primary' ) {
$query_flags->{slave_ok} = 0;
}
elsif ( grep { $mode eq $_ } qw/secondary primaryPreferred nearest/ ) {
$query_flags->{slave_ok} = 1;
$need_read_pref = 1;
}
elsif ( $mode eq 'secondaryPreferred' ) {
$query_flags->{slave_ok} = 1;
$need_read_pref = 1
unless $read_pref->has_empty_tag_sets;
}
else {
MongoDB::InternalError->throw("invalid read preference mode '$mode'");
}
if ($need_read_pref) {
if ( !$$query_ref->FETCH('$query') ) {
$$query_ref = Tie::IxHash->new( '$query' => $$query_ref );
}
$$query_ref->Push( '$readPreference' => $read_pref->for_mongos );
}
return;
}
1;
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