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📄 adhoc_task.php(4.81 KB)
📄 analytics_cleanup_task.php(1.73 KB)
📄 antivirus_cleanup_task.php(1.91 KB)
📄 asynchronous_backup_task.php(3.45 KB)
📄 asynchronous_copy_task.php(9.07 KB)
📄 asynchronous_restore_task.php(3.63 KB)
📄 automated_backup_task.php(1.65 KB)
📄 backup_cleanup_task.php(3.01 KB)
📄 badges_cron_task.php(3.14 KB)
📄 badges_message_task.php(2.17 KB)
📄 blog_cron_task.php(2.16 KB)
📄 build_installed_themes_task.php(1.73 KB)
📄 cache_cleanup_task.php(1.38 KB)
📄 cache_cron_task.php(1.33 KB)
📄 calendar_cron_task.php(2.67 KB)
📄 calendar_fix_orphaned_events.php(2.63 KB)
📄 check_for_updates_task.php(1.6 KB)
📄 clean_up_deleted_search_area_task.php(1.71 KB)
📄 complete_plans_task.php(1.89 KB)
📄 completion_daily_task.php(8.03 KB)
📄 completion_regular_task.php(2.21 KB)
📄 context_cleanup_task.php(1.64 KB)
📄 course_backup_task.php(4.05 KB)
📄 create_contexts_task.php(1.54 KB)
📄 database_logger.php(5.55 KB)
📄 delete_incomplete_users_task.php(2.58 KB)
📄 delete_unconfirmed_users_task.php(2.12 KB)
📄 file_temp_cleanup_task.php(4.36 KB)
📄 file_trash_cleanup_task.php(1.44 KB)
📄 fix_file_timestamps_task.php(1.26 KB)
📄 grade_cron_task.php(3.15 KB)
📄 grade_history_cleanup_task.php(2.09 KB)
📄 h5p_clean_orphaned_records_task.php(2.44 KB)
📄 h5p_get_content_types_task.php(2.21 KB)
📄 legacy_plugin_cron_task.php(7.59 KB)
📄 logging_trait.php(3.13 KB)
📄 logmanager.php(9.82 KB)
📄 manager.php(60.63 KB)
📄 messaging_cleanup_task.php(2.72 KB)
📄 password_reset_cleanup_task.php(1.95 KB)
📄 plagiarism_cron_task.php(2.26 KB)
📄 portfolio_cron_task.php(2.91 KB)
📄 question_preview_cleanup_task.php(2.83 KB)
📄 question_stats_cleanup_task.php(1.9 KB)
📄 refresh_mod_calendar_events_task.php(2.74 KB)
📄 registration_cron_task.php(1.37 KB)
📄 scheduled_task.php(16.4 KB)
📄 search_index_task.php(2.27 KB)
📄 search_optimize_task.php(1.76 KB)
📄 send_failed_login_notifications_task.php(8.11 KB)
📄 send_login_notifications.php(4.22 KB)
📄 send_new_user_passwords_task.php(3.33 KB)
📄 session_cleanup_task.php(1.76 KB)
📄 stats_cron_task.php(2 KB)
📄 sync_plans_from_template_cohorts_task.php(2.24 KB)
📄 tag_cron_task.php(11.28 KB)
📄 task_base.php(7.8 KB)
📄 task_lock_cleanup_task.php(1.53 KB)
📄 task_log_cleanup_task.php(1.64 KB)
📄 task_logger.php(2.36 KB)

Editing: logmanager.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Task log manager.
 *
 * @package    core
 * @category   task
 * @copyright  2018 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
namespace core\task;

defined('MOODLE_INTERNAL') || die();

/**
 * Task log manager.
 *
 * @copyright  2018 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class logmanager {

/** @var int Do not log anything */
    const MODE_NONE = 0;

/** @var int Log all tasks */
    const MODE_ALL = 1;

/** @var int Only log fails */
    const MODE_FAILONLY = 2;

/** @var int The default chunksize to use in ob_start */
    const CHUNKSIZE = 1;

/**
     * @var \core\task\task_base The task being logged.
     */
    protected static $task = null;

/**
     * @var \stdClass Metadata about the current log
     */
    protected static $taskloginfo = null;

/**
     * @var \resource The current filehandle used for logging
     */
    protected static $fh = null;

/**
     * @var string The path to the log file
     */
    protected static $logpath = null;

/**
     * @var bool Whether the task logger has been registered with the shutdown handler
     */
    protected static $tasklogregistered = false;

/**
     * @var int The level of output buffering in place before starting.
     */
    protected static $oblevel = null;

/**
     * @var bool Output logged content to screen.
     */
    protected static $outputloggedcontent = true;

/**
     * Create a new task logger for the specified task, and prepare for logging.
     *
     * @param   \core\task\task_base    $task The task being run
     */
    public static function start_logging(task_base $task) {
        global $CFG, $DB;

if (!self::should_log()) {
            return;
        }

// We register a shutdown handler to ensure that logs causing any failures are correctly disposed of.
        // Note: This must happen before the per-request directory is requested because the shutdown handler deletes the logfile.
        if (!self::$tasklogregistered) {
            \core_shutdown_manager::register_function(function() {
                // These will only actually do anything if capturing is current active when the thread ended, which
                // constitutes a failure.
                \core\task\logmanager::finalise_log(true);
            });

// Create a brand new per-request directory basedir.
            get_request_storage_directory(true, true);

self::$tasklogregistered = true;
        }

if (self::is_current_output_buffer()) {
            // We cannot capture when we are already capturing.
            throw new \coding_exception('Logging is already in progress for task "' . get_class(self::$task) . '". ' .
                'Nested logging is not supported.');
        }

// Store the initial data about the task and current state.
        self::$task = $task;
        self::$taskloginfo = (object) [
            'dbread'    => $DB->perf_get_reads(),
            'dbwrite'   => $DB->perf_get_writes(),
            'timestart' => microtime(true),
        ];

// For simplicity's sake we always store logs on disk and flush at the end.
        self::$logpath = make_request_directory() . DIRECTORY_SEPARATOR . "task.log";
        self::$fh = fopen(self::$logpath, 'w+');

// Note the level of the current output buffer.
        // Note: You cannot use ob_get_level() as it will return `1` when the default output buffer is enabled.
        if ($obstatus = ob_get_status()) {
            self::$oblevel = $obstatus['level'];
        } else {
            self::$oblevel = null;
        }

self::$outputloggedcontent = !empty($CFG->task_logtostdout);

// Start capturing output.
        ob_start([\core\task\logmanager::class, 'add_line'], self::CHUNKSIZE);
    }

/**
     * Whether logging is possible and should be happening.
     *
     * @return  bool
     */
    protected static function should_log() : bool {
        global $CFG;

// Respect the config setting.
        if (isset($CFG->task_logmode) && empty($CFG->task_logmode)) {
            return false;
        }

$loggerclass = self::get_logger_classname();
        if (empty($loggerclass)) {
            return false;
        }

return $loggerclass::is_configured();
    }

/**
     * Return the name of the logging class to use.
     *
     * @return  string
     */
    public static function get_logger_classname() : string {
        global $CFG;

if (!empty($CFG->task_log_class)) {
            // Configuration is present to use an alternative task logging class.
            return $CFG->task_log_class;
        }

// Fall back on the default database logger.
        return database_logger::class;
    }

/**
     * Whether this task logger has a report available.
     *
     * @return  bool
     */
    public static function has_log_report() : bool {
        $loggerclass = self::get_logger_classname();

return $loggerclass::has_log_report();
    }

/**
     * Whether to use the standard settings form.
     */
    public static function uses_standard_settings() : bool {
        $classname = self::get_logger_classname();
        if (!class_exists($classname)) {
            return false;
        }

if (is_a($classname, database_logger::class, true)) {
            return true;
        }

return false;
    }

/**
     * Get any URL available for viewing relevant task log reports.
     *
     * @param   string      $classname The task class to fetch for
     * @return  \moodle_url
     */
    public static function get_url_for_task_class(string $classname) : \moodle_url {
        $loggerclass = self::get_logger_classname();

return $loggerclass::get_url_for_task_class($classname);
    }

/**
     * Whether we are the current log collector.
     *
     * @return  bool
     */
    protected static function is_current_output_buffer() : bool {
        if (empty(self::$taskloginfo)) {
            return false;
        }

if ($ob = ob_get_status()) {
            return 'core\\task\\logmanager::add_line' == $ob['name'];
        }

return false;
    }

/**
     * Whether we are capturing at all.
     *
     * @return  bool
     */
    protected static function is_capturing() : bool {
        $buffers = ob_get_status(true);
        foreach ($buffers as $ob) {
            if ('core\\task\\logmanager::add_line' == $ob['name']) {
                return true;
            }
        }

return false;
    }

/**
     * Finish writing for the current task.
     *
     * @param   bool    $failed
     */
    public static function finalise_log(bool $failed = false) {
        global $CFG, $DB, $PERF;

if (!self::should_log()) {
            return;
        }

if (!self::is_capturing()) {
            // Not capturing anything.
            return;
        }

// Ensure that all logs are closed.
        $buffers = ob_get_status(true);
        foreach (array_reverse($buffers) as $ob) {
            if (null !== self::$oblevel) {
                if ($ob['level'] <= self::$oblevel) {
                    // Only close as far as the initial output buffer level.
                    break;
                }
            }

// End and flush this buffer.
            ob_end_flush();

if ('core\\task\\logmanager::add_line' == $ob['name']) {
                break;
            }
        }
        self::$oblevel = null;

// Flush any remaining buffer.
        self::flush();

// Close and unset the FH.
        fclose(self::$fh);
        self::$fh = null;

if ($failed || empty($CFG->task_logmode) || self::MODE_ALL == $CFG->task_logmode) {
            // Finalise the log.
            $loggerclass = self::get_logger_classname();
            $loggerclass::store_log_for_task(
                self::$task,
                self::$logpath,
                $failed,
                $DB->perf_get_reads() - self::$taskloginfo->dbread,
                $DB->perf_get_writes() - self::$taskloginfo->dbwrite - $PERF->logwrites,
                self::$taskloginfo->timestart,
                microtime(true)
            );
        }

// Tidy up.
        self::$logpath = null;
        self::$taskloginfo = null;
    }

/**
     * Flush the current output buffer.
     *
     * This function will ensure that we are the current output buffer handler.
     */
    public static function flush() {
        // We only call ob_flush if the current output buffer belongs to us.
        if (self::is_current_output_buffer()) {
            ob_flush();
        }
    }

/**
     * Add a log record to the task log.
     *
     * @param   string  $log
     * @return  string
     */
    public static function add_line(string $log) : string {
        if (empty(self::$taskloginfo)) {
            return $log;
        }

if (empty(self::$fh)) {
            return $log;
        }

if (self::is_current_output_buffer()) {
            fwrite(self::$fh, $log);
        }

if (self::$outputloggedcontent) {
            return $log;
        } else {
            return '';
        }
    }
}

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