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#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/balance_linked_node_quotas.pl   Copyright 2022 cPanel, L.L.C.
#                                                           All rights reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

package scripts::balance_linked_node_quotas;

use cPstrict;

=encoding utf-8

=head1 NAME

F<balance_linked_node_quotas>

=head1 USAGE

balance_linked_node_quotas [--help]

=head1 DESCRIPTION

If a user has a 10-MiB disk quota and distributes its activity across
multiple cPanel & WHM servers, we need a way to enforce a single quota
across multiple servers. This script serves that function.

To do this, we begin by collecting disk usage from all worker
nodes. For each user, we compute disk usage on all worker nodes then alter
quotas so that each individual node’s account for the user has a quota
proportional to disk usage.

For example: consider a user with a 10-MiB quota who uses a Mail worker.
Assume that the local (controller) node uses 3.1 MiB of space, and the Mail
node uses 6.2 MiB. In this setup, the controller account uses 1/3rd of the
account’s total disk usage, so we’ll assign it that share of the quota, or
3.33 MiB. Likewise, the Mail worker uses 2/3rds of the account’s total
disk usage, so we’ll give it 6.67 MiB of the quota.

Note that we don’t actually limit users until they reach a threshold of
disk usage; until that time each of the user’s nodes has the full quota
(for example, 10 MiB for this user).

=cut

#----------------------------------------------------------------------

use parent qw( Cpanel::HelpfulScript );

use List::Util;

use AnyEvent ();

use Cpanel::Config::Users                  ();
use Cpanel::LinkedNode::QuotaBalancer::Run ();
use Cpanel::Output::Formatted::Terminal    ();
use Whostmgr::ACLS                         ();

use constant _OPTIONS => ('verbose');

our ( $a, $b );

__PACKAGE__->new(@ARGV)->run() if !caller;

#----------------------------------------------------------------------

sub run ($self) {
    local $ENV{'REMOTE_USER'} = getpwuid $>;
    Whostmgr::ACLS::init_acls();

my $cv = AnyEvent->condvar();

my @usernames = Cpanel::Config::Users::getcpusers();

my $logger = Cpanel::Output::Formatted::Terminal->new();

my $runstate = Cpanel::LinkedNode::QuotaBalancer::Run::run_for_users(
        \@usernames,
        $logger,
        verbosity => $self->getopt('verbose') ? 1 : 0,
    );

$runstate->get_promise()->finally($cv);

$cv->recv();

return;
}