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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.
package Bugzilla::Bloomfilter;
use 5.10.1;
use strict;
use warnings;
use Bugzilla::Constants;
use Algorithm::BloomFilter;
use File::Slurper qw(write_binary read_binary read_lines);
use File::Spec::Functions qw(catfile);
sub _new_bloom_filter {
my ($n) = @_;
my $p = 0.01;
my $m = $n * abs(log $p) / log(2) ** 2;
my $k = $m / $n * log(2);
return Algorithm::BloomFilter->new($m, $k);
}
sub _filename {
my ($name, $type) = @_;
my $datadir = bz_locations->{datadir};
return catfile($datadir, "$name.$type");
}
sub populate {
my ($class, $name) = @_;
my $memcached = Bugzilla->memcached;
my @items = read_lines(_filename($name, 'list'));
my $filter = _new_bloom_filter(@items + 0);
$filter->add($_) foreach @items;
write_binary(_filename($name, 'bloom'), $filter->serialize);
$memcached->clear_bloomfilter({name => $name});
}
sub lookup {
my ($class, $name) = @_;
my $memcached = Bugzilla->memcached;
my $filename = _filename($name, 'bloom');
my $filter_data = $memcached->get_bloomfilter( { name => $name } );
if (!$filter_data && -f $filename) {
$filter_data = read_binary($filename);
$memcached->set_bloomfilter({ name => $name, filter => $filter_data });
}
return Algorithm::BloomFilter->deserialize($filter_data) if $filter_data;
return undef;
}
1;
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