TikiWiki/tiki-manager

<?php
// Copyright (c) 2016, Avan.Tech, et. al.
// Copyright (c) 2008, Luis Argerich, Garland Foster, Eduardo Polidor, et. al.
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.

namespace TikiManager\Report;

class Backup
{
    public function queueChannels(Channel $channel, $instances)
    {
        $channel->push(
            'trim_backup_summary',
            ['body' => $this->getSummary($instances)]
        );

        foreach ($instances as $instance) {
            $channel->push(
                'trim_backup_detail',
                [
                    'instance_name' => $instance->name,
                    'body' => $this->getDetails($instance)
                ]
            );
        }
    }

    private function getSummary($instances)
    {
        $this->getDiskUsage($used, $total, $free);
        $humanUsed = $this->humanReadableSize($used, 1);
        $humanTotal = $this->humanReadableSize($total, 1);
        $humanFree = $this->humanReadableSize($free, 1);

        $usedRatio = $used / $total * 100;
        $availableRatio = $free / $total * 100;

        $date = date('F j, Y');
        $summary = <<<SUM
! Summary
{img src="http://chart.apis.google.com/chart?cht=p3&chd=t:$usedRatio%2C$availableRatio&chs=500x150&chl=Used%7CAvailable&chtt=Disk+Usage" imalign=right}
__Disk usage:__ $humanUsed / $humanTotal ( $humanFree free )
__Date:__ $date

SUM;

        $summary .= <<<OUT

{maketoc}

OUT;

        return $summary;
    }

    private function hasValidBackup($instance)
    {
        $archives = $instance->getArchives();
        if (count($archives) == 0) {
            return false;
        }

        // Last backup within 24 hours
        if (time() - filemtime($archives[0]) > 24*3600) {
            return false;
        }

        $backups = array_map('filesize', $archives);
        $average = array_sum($backups) / count($backups);

        // Last backup not below 90% of the average
        if ($backups[0] < 0.9 * $average) {
            return false;
        }

        return true;
    }

    private function getDiskUsage(&$used, &$total, &$available)
    {
        $path = escapeshellarg($_ENV['ARCHIVE_FOLDER']);
        $out = `df $path | awk '/^\// {print $3,$2,$4}'`;

        list($used, $total, $available) = explode(' ', $out);
    }

    private function humanReadableSize($value, $init = 0)
    {
        $unit = ['K', 'M','G','T','P'];
        for ($i = 0; $init > $i; ++$i) {
            array_shift($unit);
        }

        $used = '';
        while ($value >= 1000 && count($unit) > 0) {
            $value /= 1024;
            $used = array_shift($unit);
        }

        return round($value, 1) . $used . 'B';
    }

    private function getDetails($instance)
    {
        $archives = $instance->getArchives();

        if (count($archives) > 0) {
            $valid = $this->hasValidBackup($instance) ? 'accept' : 'exclamation';
            $backups = array_map('filesize', $archives);
            $latest = $this->humanReadableSize($backups[0]);

            $sizes = implode('%2C', $this->getRelativeSizes($backups));

            $title = urlencode("{$instance->name} Backup Sizes");
            $date = date('F j, Y H:i:s', filemtime($archives[0]));
            $detail = <<<DET

! {img src=pics/icons/$valid.png} {$instance->name}
{img src="http://chart.apis.google.com/chart?cht=bvg&chd=t:$sizes&chs=500x150&chtt=$title" imalign=right}
__Website:__ [{$instance->weburl}]
__Contact:__ [mailto:{$instance->contact}|{$instance->contact}]
__Last backup:__ $date
__Backup size:__ $latest

{FADE(label="Backups")}
||__Date__|__Size__|__Location__

DET;
            foreach ($archives as $key => $file) {
                $date = date('Y-m-d H:i:s', filemtime($file));
                $size = $this->humanReadableSize($backups[$key]);
                $detail .= "$date|$size|$file\n";
            }

            $detail .= <<<DET
||
{FADE}
DET;
        } else {
            $detail = <<<DET

! {img src=pics/icons/exclamation.png} {$instance->name}
__Website:__ [{$instance->weburl}]
__Contact:__ [mailto:{$instance->contact}|{$instance->contact}]
__Last backup:__ ~~red:NEVER~~
DET;
        }

        return $detail;
    }

    private function getRelativeSizes($sizes)
    {
        $low = array_reduce($sizes, 'min', $sizes[0]);
        $high = array_reduce($sizes, 'max', $sizes[0]);
        $high = $high + 0.1 * $high;
        $low = $low - 0.2 * $low;

        $span = $high - $low;

        $percs = [];
        foreach ($sizes as $size) {
            $percs[] = ($size - $low) / $span * 100;
        }

        return $percs;
    }
}

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