File Sources/ViewQuery.php

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<?php

/**
 * Functions concerned with viewing queries, and is used for debugging.
 *
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines https://www.simplemachines.org
 * @copyright 2020 Simple Machines and individual contributors
 * @license https://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 RC2
 */

if (!defined('SMF'))
    die('No direct access...');

/**
 * Show the database queries for debugging
 * What this does:
 * - Toggles the session variable 'view_queries'.
 * - Views a list of queries and analyzes them.
 * - Requires the admin_forum permission.
 * - Is accessed via ?action=viewquery.
 * - Strings in this function have not been internationalized.
 */
function ViewQuery()
{
    global $scripturl, $settings, $context, $db_connection, $boarddir, $smcFunc, $txt, $db_show_debug;

    // We should have debug mode enabled, as well as something to display!
    if (!isset($db_show_debug) || $db_show_debug !== true || !isset($_SESSION['debug']))
        fatal_lang_error('no_access', false);

    // Don't allow except for administrators.
    isAllowedTo('admin_forum');

    // If we're just hiding/showing, do it now.
    if (isset($_REQUEST['sa']) && $_REQUEST['sa'] == 'hide')
    {
        $_SESSION['view_queries'] = $_SESSION['view_queries'] == 1 ? 0 : 1;

        if (strpos($_SESSION['old_url'], 'action=viewquery') !== false)
            redirectexit();
        else
            redirectexit($_SESSION['old_url']);
    }

    call_integration_hook('integrate_egg_nog');

    $query_id = isset($_REQUEST['qq']) ? (int) $_REQUEST['qq'] - 1 : -1;

    echo '<!DOCTYPE html>
<html', $context['right_to_left'] ? ' dir="rtl"' : '', '>
    <head>
        <title>', $context['forum_name_html_safe'], '</title>
        <link rel="stylesheet" href="', $settings['theme_url'], '/css/index', $context['theme_variant'], '.css?alp21">
        <style>
            body
            {
                margin: 1ex;
            }
            body, td, th, .normaltext
            {
                font-size: x-small;
            }
            .smalltext
            {
                font-size: xx-small;
            }
        </style>
    </head>
    <body id="help_popup">
        <div class="tborder windowbg description">';

    foreach ($_SESSION['debug'] as $q => $query_data)
    {
        // Fix the indentation....
        $query_data['q'] = ltrim(str_replace("\r", '', $query_data['q']), "\n");
        $query = explode("\n", $query_data['q']);
        $min_indent = 0;
        foreach ($query as $line)
        {
            preg_match('/^(\t*)/', $line, $temp);
            if (strlen($temp[0]) < $min_indent || $min_indent == 0)
                $min_indent = strlen($temp[0]);
        }
        foreach ($query as $l => $dummy)
            $query[$l] = substr($dummy, $min_indent);
        $query_data['q'] = implode("\n", $query);

        // Make the filenames look a bit better.
        if (isset($query_data['f']))
            $query_data['f'] = preg_replace('~^' . preg_quote($boarddir, '~') . '~', '...', $query_data['f']);

        $is_select_query = substr(trim($query_data['q']), 0, 6) == 'SELECT';
        if ($is_select_query)
            $select = $query_data['q'];
        elseif (preg_match('~^INSERT(?: IGNORE)? INTO \w+(?:\s+\([^)]+\))?\s+(SELECT .+)$~s', trim($query_data['q']), $matches) != 0)
        {
            $is_select_query = true;
            $select = $matches[1];
        }
        elseif (preg_match('~^CREATE TEMPORARY TABLE .+?(SELECT .+)$~s', trim($query_data['q']), $matches) != 0)
        {
            $is_select_query = true;
            $select = $matches[1];
        }
        // Temporary tables created in earlier queries are not explainable.
        if ($is_select_query)
        {
            foreach (array('log_topics_unread', 'topics_posted_in', 'tmp_log_search_topics', 'tmp_log_search_messages') as $tmp)
                if (strpos($select, $tmp) !== false)
                {
                    $is_select_query = false;
                    break;
                }
        }

        echo '
        <div id="qq', $q, '" style="margin-bottom: 2ex;">
            <a', $is_select_query ? ' href="' . $scripturl . '?action=viewquery;qq=' . ($q + 1) . '#qq' . $q . '"' : '', ' style="font-weight: bold; text-decoration: none;">
                ', nl2br(str_replace("\t", '&nbsp;&nbsp;&nbsp;', $smcFunc['htmlspecialchars']($query_data['q']))), '
            </a><br>';

        if (!empty($query_data['f']) && !empty($query_data['l']))
            echo sprintf($txt['debug_query_in_line'], $query_data['f'], $query_data['l']);

        if (isset($query_data['s'], $query_data['t']) && isset($txt['debug_query_which_took_at']))
            echo sprintf($txt['debug_query_which_took_at'], round($query_data['t'], 8), round($query_data['s'], 8));
        else
            echo sprintf($txt['debug_query_which_took'], round($query_data['t'], 8));

        echo '
        </div>';

        // Explain the query.
        if ($query_id == $q && $is_select_query)
        {
            $result = $smcFunc['db_query']('', '
                EXPLAIN ' . ($smcFunc['db_title'] === POSTGRE_TITLE ? 'ANALYZE ' : '') . $select,
                array(
                )
            );
            if ($result === false)
            {
                echo '
        <table>
            <tr><td>', $smcFunc['db_error']($db_connection), '</td></tr>
        </table>';
                continue;
            }

            echo '
        <table>';

            $row = $smcFunc['db_fetch_assoc']($result);

            echo '
            <tr>
                <th>' . implode('</th>
                <th>', array_keys($row)) . '</th>
            </tr>';

            $smcFunc['db_data_seek']($result, 0);
            while ($row = $smcFunc['db_fetch_assoc']($result))
            {
                echo '
            <tr>
                <td>' . implode('</td>
                <td>', $row) . '</td>
            </tr>';
            }
            $smcFunc['db_free_result']($result);

            echo '
        </table>';
        }
    }

    echo '
        </div>
    </body>
</html>';

    obExit(false);
}

?>

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