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#!/usr/local/cpanel/3rdparty/bin/perl
# cpanel - scripts/optimize_eximstats              Copyright 2019 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::optimize_eximstats;

use strict;
## no critic qw(TestingAndDebugging::RequireUseWarnings) -- not fully vetted for warnings

use parent qw( Cpanel::HelpfulScript );

our $VERSION  = 1.4;
our $PID_FILE = '/var/run/optimize_eximstats.pid';

use Cpanel::Alarm                ();
use Cpanel::DiskCheck            ();
use Cpanel::EximStats::ConnectDB ();
use Cpanel::EximStats::Constants ();
use Cpanel::PIDFile              ();
use Cpanel::Sys::Load            ();

use File::Basename ();

=encoding utf-8

=head1 NAME

scripts::optimize_eximstats

=head1 SYNOPSIS

    /usr/local/cpanel/scripts/optimize_eximstats

=head1 DESCRIPTION

This script is used to vacuum (defragment) the eximstats database.

=cut

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

sub _OPTIONS {
    return;
}

sub run {
    my ($self) = @_;

    $self->has_required_diskspace();

    Cpanel::PIDFile->do(
        $PID_FILE,
        sub {
            my $main_alarm = Cpanel::Alarm->new( 2 * 60**2, sub { die "optimize_eximstats ran for longer then two hours."; } );
            $self->vacuum_database();
        }
    );

    return;
}

sub vacuum_database {
    my ($self) = @_;

    local $ENV{'SQLITE_TMPDIR'} = File::Basename::dirname($Cpanel::EximStats::Constants::EXIMSTATS_SQLITE_DB);
    my $dbh = Cpanel::EximStats::ConnectDB::dbconnect();

    my ( $load_one, $load_five, $load_fifteen ) = Cpanel::Sys::Load::getloadavg($Cpanel::Sys::Load::ForceFloat);

    $load_one = sprintf( "%.05f", $load_one );    # Reduce precision on load_one to avoid divide by zero below (FPU fun)

    print "Optimizing eximstats (current load avg: $load_one)......";
    $dbh->do('VACUUM;');
    print "Done\n";
    my ( $post_load_one, $post_load_five, $post_load_fifteen ) = Cpanel::Sys::Load::getloadavg($Cpanel::Sys::Load::ForceFloat);

    print "Load before optimize: $load_one, Load after optimize: $post_load_one.\n";
    print "Optimization complete.\n";

    return;
}

sub has_required_diskspace {
    my ($self) = @_;

    # from: https://sqlite.org/lang_vacuum.html
    # This means that when VACUUMing a database, as much as twice the size
    # of the original database file is required in free disk space.

    # https://sqlite.org/tempfiles.html
    # 5. Temporary File Storage Locations
    # The directory or folder in which temporary files are created is determined by the OS-specific VFS.
    # On unix-like systems, directories are searched in the following order:
    # The directory set by PRAGMA temp_store_directory or by the sqlite3_temp_directory global variable
    # The SQLITE_TMPDIR environment variable
    # The TMPDIR environment variable
    # /var/tmp
    # /usr/tmp
    # /tmp
    # The current working directory (".")
    # The first of the above that is found to exist and have the write and execute bits set is used.
    # The final "." fallback is important for some applications that use SQLite inside of chroot jails that
    # do not have the standard temporary file locations available.

    my $disk_used_bytes = -s $Cpanel::EximStats::Constants::EXIMSTATS_SQLITE_DB;
    my $dir             = File::Basename::dirname($Cpanel::EximStats::Constants::EXIMSTATS_SQLITE_DB);
    my $disk_output     = '';
    my ( $disk_ok, $disk_msg ) = Cpanel::DiskCheck::target_has_enough_free_space_to_fit_source_sizes(
        'source_sizes'   => [ { 'optimize_eximstats' => $disk_used_bytes } ],
        'target'         => $dir,
        'output_coderef' => sub { my ($msg) = @_; $disk_output .= $msg; return 1; }
    );

    print "$disk_output\n";

    die $disk_msg if !$disk_ok;

    return;
}

1;

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