mirror of
https://github.com/moodle/moodle.git
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3e7e2ab2ee
encode_backup_temp_info() and decode_backup_temp_info() have been introduced to keep the info field encoding in one place. Many locations used get_backup_ids_record() to obtain info, that makes lots of calls to get_backup_ids_record() which can be slow. We now complete all those inline by adding the info field to the query. To reduce memory usage, all queries of that nature have been changed to use get_recordset_*. gzcompress was introduced if available to minimize traffic to/from the database and to decrease the memory required for caching. The compression time is saved by the benefits in other places of having smaller data.
544 lines
23 KiB
PHP
544 lines
23 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* @package moodlecore
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* @subpackage backup-dbops
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* @copyright 2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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/**
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* Non instantiable helper class providing DB support to the @backup_controller
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*
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* This class contains various static methods available for all the DB operations
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* performed by the backup_controller class
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*
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* TODO: Finish phpdocs
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*/
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abstract class backup_controller_dbops extends backup_dbops {
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/**
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* Send one backup controller to DB
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*
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* @param backup_controller $controller controller to send to DB
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* @param string $checksum hash of the controller to be checked
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* @param bool $includeobj to decide if the object itself must be updated (true) or no (false)
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* @param bool $cleanobj to decide if the object itself must be cleaned (true) or no (false)
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* @return int id of the controller record in the DB
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* @throws backup_controller_exception|backup_dbops_exception
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*/
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public static function save_controller($controller, $checksum, $includeobj = true, $cleanobj = false) {
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global $DB;
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// Check we are going to save one backup_controller
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if (! $controller instanceof backup_controller) {
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throw new backup_controller_exception('backup_controller_expected');
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}
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// Check checksum is ok. Only if we are including object info. Sounds silly but it isn't ;-).
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if ($includeobj and !$controller->is_checksum_correct($checksum)) {
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throw new backup_dbops_exception('backup_controller_dbops_saving_checksum_mismatch');
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}
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// Cannot request to $includeobj and $cleanobj at the same time.
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if ($includeobj and $cleanobj) {
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throw new backup_dbops_exception('backup_controller_dbops_saving_cannot_include_and_delete');
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}
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// Get all the columns
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$rec = new stdclass();
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$rec->backupid = $controller->get_backupid();
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$rec->operation = $controller->get_operation();
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$rec->type = $controller->get_type();
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$rec->itemid = $controller->get_id();
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$rec->format = $controller->get_format();
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$rec->interactive = $controller->get_interactive();
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$rec->purpose = $controller->get_mode();
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$rec->userid = $controller->get_userid();
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$rec->status = $controller->get_status();
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$rec->execution = $controller->get_execution();
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$rec->executiontime= $controller->get_executiontime();
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$rec->checksum = $checksum;
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// Serialize information
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if ($includeobj) {
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$rec->controller = base64_encode(serialize($controller));
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} else if ($cleanobj) {
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$rec->controller = '';
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}
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// Send it to DB
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if ($recexists = $DB->get_record('backup_controllers', array('backupid' => $rec->backupid))) {
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$rec->id = $recexists->id;
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$rec->timemodified = time();
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$DB->update_record('backup_controllers', $rec);
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} else {
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$rec->timecreated = time();
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$rec->timemodified = 0;
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$rec->id = $DB->insert_record('backup_controllers', $rec);
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}
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return $rec->id;
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}
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public static function load_controller($backupid) {
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global $DB;
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if (! $controllerrec = $DB->get_record('backup_controllers', array('backupid' => $backupid))) {
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throw new backup_dbops_exception('backup_controller_dbops_nonexisting');
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}
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$controller = unserialize(base64_decode($controllerrec->controller));
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// Check checksum is ok. Sounds silly but it isn't ;-)
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if (!$controller->is_checksum_correct($controllerrec->checksum)) {
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throw new backup_dbops_exception('backup_controller_dbops_loading_checksum_mismatch');
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}
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return $controller;
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}
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public static function create_backup_ids_temp_table($backupid) {
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global $CFG, $DB;
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$dbman = $DB->get_manager(); // We are going to use database_manager services
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$xmldb_table = new xmldb_table('backup_ids_temp');
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$xmldb_table->add_field('id', XMLDB_TYPE_INTEGER, '10', null, XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
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// Set default backupid (not needed but this enforce any missing backupid). That's hackery in action!
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$xmldb_table->add_field('backupid', XMLDB_TYPE_CHAR, 32, null, XMLDB_NOTNULL, null, $backupid);
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$xmldb_table->add_field('itemname', XMLDB_TYPE_CHAR, 160, null, XMLDB_NOTNULL, null, null);
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$xmldb_table->add_field('itemid', XMLDB_TYPE_INTEGER, 10, null, XMLDB_NOTNULL, null, null);
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$xmldb_table->add_field('newitemid', XMLDB_TYPE_INTEGER, 10, null, XMLDB_NOTNULL, null, '0');
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$xmldb_table->add_field('parentitemid', XMLDB_TYPE_INTEGER, 10, null, null, null, null);
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$xmldb_table->add_field('info', XMLDB_TYPE_TEXT, null, null, null, null, null);
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$xmldb_table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
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$xmldb_table->add_key('backupid_itemname_itemid_uk', XMLDB_KEY_UNIQUE, array('backupid','itemname','itemid'));
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$xmldb_table->add_index('backupid_parentitemid_ix', XMLDB_INDEX_NOTUNIQUE, array('backupid','itemname','parentitemid'));
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$xmldb_table->add_index('backupid_itemname_newitemid_ix', XMLDB_INDEX_NOTUNIQUE, array('backupid','itemname','newitemid'));
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$dbman->create_temp_table($xmldb_table); // And create it
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}
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public static function create_backup_files_temp_table($backupid) {
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global $CFG, $DB;
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$dbman = $DB->get_manager(); // We are going to use database_manager services
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$xmldb_table = new xmldb_table('backup_files_temp');
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$xmldb_table->add_field('id', XMLDB_TYPE_INTEGER, '10', null, XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
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// Set default backupid (not needed but this enforce any missing backupid). That's hackery in action!
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$xmldb_table->add_field('backupid', XMLDB_TYPE_CHAR, 32, null, XMLDB_NOTNULL, null, $backupid);
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$xmldb_table->add_field('contextid', XMLDB_TYPE_INTEGER, 10, null, XMLDB_NOTNULL, null, null);
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$xmldb_table->add_field('component', XMLDB_TYPE_CHAR, 100, null, XMLDB_NOTNULL, null, null);
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$xmldb_table->add_field('filearea', XMLDB_TYPE_CHAR, 50, null, XMLDB_NOTNULL, null, null);
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$xmldb_table->add_field('itemid', XMLDB_TYPE_INTEGER, 10, null, XMLDB_NOTNULL, null, null);
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$xmldb_table->add_field('info', XMLDB_TYPE_TEXT, null, null, null, null, null);
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$xmldb_table->add_field('newcontextid', XMLDB_TYPE_INTEGER, 10, null, null, null, null);
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$xmldb_table->add_field('newitemid', XMLDB_TYPE_INTEGER, 10, null, null, null, null);
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$xmldb_table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
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$xmldb_table->add_index('backupid_contextid_component_filearea_itemid_ix', XMLDB_INDEX_NOTUNIQUE, array('backupid','contextid','component','filearea','itemid'));
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$dbman->create_temp_table($xmldb_table); // And create it
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}
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public static function drop_backup_ids_temp_table($backupid) {
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global $DB;
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$dbman = $DB->get_manager(); // We are going to use database_manager services
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$targettablename = 'backup_ids_temp';
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$table = new xmldb_table($targettablename);
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$dbman->drop_table($table); // And drop it
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}
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/**
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* Decode the info field from backup_ids_temp or backup_files_temp.
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*
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* @param mixed $info The info field data to decode, may be an object or a simple integer.
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* @return mixed The decoded information. For simple types it returns, for complex ones we decode.
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*/
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public static function decode_backup_temp_info($info) {
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// We encode all data except null.
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if ($info != null) {
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if (extension_loaded('zlib')) {
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return unserialize(gzuncompress(base64_decode($info)));
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} else {
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return unserialize(base64_decode($info));
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}
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}
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return $info;
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}
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/**
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* Encode the info field for backup_ids_temp or backup_files_temp.
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*
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* @param mixed $info string The info field data to encode.
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* @return string An encoded string of data or null if the input is null.
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*/
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public static function encode_backup_temp_info($info) {
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// We encode if there is any information to keep the translations simpler.
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if ($info != null) {
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// We compress if possible. It reduces db, network and memory storage. The saving is greater than CPU compression cost.
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// Compression level 1 is chosen has it produces good compression with the smallest possible overhead, see MDL-40618.
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if (extension_loaded('zlib')) {
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return base64_encode(gzcompress(serialize($info), 1));
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} else {
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return base64_encode(serialize($info));
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}
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}
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return $info;
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}
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/**
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* Given one type and id from controller, return the corresponding courseid
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*/
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public static function get_courseid_from_type_id($type, $id) {
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global $DB;
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if ($type == backup::TYPE_1COURSE) {
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return $id; // id is the course id
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} else if ($type == backup::TYPE_1SECTION) {
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if (! $courseid = $DB->get_field('course_sections', 'course', array('id' => $id))) {
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throw new backup_dbops_exception('course_not_found_for_section', $id);
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}
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return $courseid;
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} else if ($type == backup::TYPE_1ACTIVITY) {
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if (! $courseid = $DB->get_field('course_modules', 'course', array('id' => $id))) {
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throw new backup_dbops_exception('course_not_found_for_moduleid', $id);
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}
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return $courseid;
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}
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}
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/**
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* Given one activity task, return the activity information and related settings
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* Used by get_moodle_backup_information()
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*/
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private static function get_activity_backup_information($task) {
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$contentinfo = array(
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'moduleid' => $task->get_moduleid(),
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'sectionid' => $task->get_sectionid(),
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'modulename' => $task->get_modulename(),
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'title' => $task->get_name(),
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'directory' => 'activities/' . $task->get_modulename() . '_' . $task->get_moduleid());
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// Now get activity settings
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// Calculate prefix to find valid settings
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$prefix = basename($contentinfo['directory']);
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$settingsinfo = array();
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foreach ($task->get_settings() as $setting) {
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// Discard ones without valid prefix
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if (strpos($setting->get_name(), $prefix) !== 0) {
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continue;
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}
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// Validate level is correct (activity)
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if ($setting->get_level() != backup_setting::ACTIVITY_LEVEL) {
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throw new backup_controller_exception('setting_not_activity_level', $setting);
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}
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$settinginfo = array(
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'level' => 'activity',
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'activity' => $prefix,
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'name' => $setting->get_name(),
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'value' => $setting->get_value());
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$settingsinfo[$setting->get_name()] = (object)$settinginfo;
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}
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return array($contentinfo, $settingsinfo);
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}
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/**
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* Given one section task, return the section information and related settings
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* Used by get_moodle_backup_information()
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*/
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private static function get_section_backup_information($task) {
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$contentinfo = array(
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'sectionid' => $task->get_sectionid(),
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'title' => $task->get_name(),
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'directory' => 'sections/' . 'section_' . $task->get_sectionid());
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// Now get section settings
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// Calculate prefix to find valid settings
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$prefix = basename($contentinfo['directory']);
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$settingsinfo = array();
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foreach ($task->get_settings() as $setting) {
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// Discard ones without valid prefix
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if (strpos($setting->get_name(), $prefix) !== 0) {
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continue;
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}
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// Validate level is correct (section)
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if ($setting->get_level() != backup_setting::SECTION_LEVEL) {
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throw new backup_controller_exception('setting_not_section_level', $setting);
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}
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$settinginfo = array(
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'level' => 'section',
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'section' => $prefix,
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'name' => $setting->get_name(),
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'value' => $setting->get_value());
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$settingsinfo[$setting->get_name()] = (object)$settinginfo;
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}
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return array($contentinfo, $settingsinfo);
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}
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/**
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* Given one course task, return the course information and related settings
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* Used by get_moodle_backup_information()
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*/
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private static function get_course_backup_information($task) {
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$contentinfo = array(
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'courseid' => $task->get_courseid(),
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'title' => $task->get_name(),
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'directory' => 'course');
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// Now get course settings
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// Calculate prefix to find valid settings
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$prefix = basename($contentinfo['directory']);
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$settingsinfo = array();
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foreach ($task->get_settings() as $setting) {
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// Discard ones without valid prefix
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if (strpos($setting->get_name(), $prefix) !== 0) {
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continue;
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}
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// Validate level is correct (course)
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if ($setting->get_level() != backup_setting::COURSE_LEVEL) {
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throw new backup_controller_exception('setting_not_course_level', $setting);
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}
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$settinginfo = array(
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'level' => 'course',
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'name' => $setting->get_name(),
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'value' => $setting->get_value());
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$settingsinfo[$setting->get_name()] = (object)$settinginfo;
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}
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return array($contentinfo, $settingsinfo);
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}
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/**
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* Given one root task, return the course information and related settings
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* Used by get_moodle_backup_information()
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*/
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private static function get_root_backup_information($task) {
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// Now get root settings
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$settingsinfo = array();
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foreach ($task->get_settings() as $setting) {
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// Validate level is correct (root)
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if ($setting->get_level() != backup_setting::ROOT_LEVEL) {
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throw new backup_controller_exception('setting_not_root_level', $setting);
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}
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$settinginfo = array(
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'level' => 'root',
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'name' => $setting->get_name(),
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'value' => $setting->get_value());
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$settingsinfo[$setting->get_name()] = (object)$settinginfo;
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}
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return array(null, $settingsinfo);
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}
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/**
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* Get details information for main moodle_backup.xml file, extracting it from
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* the specified controller
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*/
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public static function get_moodle_backup_information($backupid) {
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$detailsinfo = array(); // Information details
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$contentsinfo= array(); // Information about backup contents
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$settingsinfo= array(); // Information about backup settings
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$bc = self::load_controller($backupid); // Load controller
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// Details info
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$detailsinfo['id'] = $bc->get_id();
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$detailsinfo['backup_id'] = $bc->get_backupid();
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$detailsinfo['type'] = $bc->get_type();
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$detailsinfo['format'] = $bc->get_format();
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$detailsinfo['interactive'] = $bc->get_interactive();
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$detailsinfo['mode'] = $bc->get_mode();
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$detailsinfo['execution'] = $bc->get_execution();
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$detailsinfo['executiontime'] = $bc->get_executiontime();
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$detailsinfo['userid'] = $bc->get_userid();
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$detailsinfo['courseid'] = $bc->get_courseid();
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// Init content placeholders
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$contentsinfo['activities'] = array();
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$contentsinfo['sections'] = array();
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$contentsinfo['course'] = array();
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// Contents info (extract information from tasks)
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foreach ($bc->get_plan()->get_tasks() as $task) {
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if ($task instanceof backup_activity_task) { // Activity task
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if ($task->get_setting_value('included')) { // Only return info about included activities
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list($contentinfo, $settings) = self::get_activity_backup_information($task);
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$contentsinfo['activities'][] = $contentinfo;
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$settingsinfo = array_merge($settingsinfo, $settings);
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}
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} else if ($task instanceof backup_section_task) { // Section task
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if ($task->get_setting_value('included')) { // Only return info about included sections
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list($contentinfo, $settings) = self::get_section_backup_information($task);
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$contentsinfo['sections'][] = $contentinfo;
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$settingsinfo = array_merge($settingsinfo, $settings);
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}
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} else if ($task instanceof backup_course_task) { // Course task
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list($contentinfo, $settings) = self::get_course_backup_information($task);
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$contentsinfo['course'][] = $contentinfo;
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$settingsinfo = array_merge($settingsinfo, $settings);
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} else if ($task instanceof backup_root_task) { // Root task
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list($contentinfo, $settings) = self::get_root_backup_information($task);
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$settingsinfo = array_merge($settingsinfo, $settings);
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}
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}
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$bc->destroy(); // Always need to destroy controller to handle circular references
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return array(array((object)$detailsinfo), $contentsinfo, $settingsinfo);
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}
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/**
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* Update CFG->backup_version and CFG->backup_release if change in
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* version is detected.
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*/
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public static function apply_version_and_release() {
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global $CFG;
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if ($CFG->backup_version < backup::VERSION) {
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set_config('backup_version', backup::VERSION);
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set_config('backup_release', backup::RELEASE);
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}
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}
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/**
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* Given the backupid, detect if the backup includes "mnet" remote users or no
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*/
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public static function backup_includes_mnet_remote_users($backupid) {
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global $CFG, $DB;
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$sql = "SELECT COUNT(*)
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FROM {backup_ids_temp} b
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JOIN {user} u ON u.id = b.itemid
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WHERE b.backupid = ?
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AND b.itemname = 'userfinal'
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AND u.mnethostid != ?";
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$count = $DB->count_records_sql($sql, array($backupid, $CFG->mnet_localhost_id));
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return (int)(bool)$count;
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}
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/**
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* Given the backupid, determine whether this backup should include
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* files from the moodle file storage system.
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*
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* @param string $backupid The ID of the backup.
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* @return int Indicates whether files should be included in backups.
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*/
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public static function backup_includes_files($backupid) {
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// Load controller
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$bc = self::load_controller($backupid);
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return $bc->get_include_files();
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}
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/**
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* Given the backupid, detect if the backup contains references to external contents
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*
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* @copyright 2012 Dongsheng Cai {@link http://dongsheng.org}
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* @return int
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*/
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public static function backup_includes_file_references($backupid) {
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global $CFG, $DB;
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$sql = "SELECT count(r.repositoryid)
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FROM {files} f
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LEFT JOIN {files_reference} r
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ON r.id = f.referencefileid
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JOIN {backup_ids_temp} bi
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ON f.id = bi.itemid
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WHERE bi.backupid = ?
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AND bi.itemname = 'filefinal'";
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$count = $DB->count_records_sql($sql, array($backupid));
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return (int)(bool)$count;
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}
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/**
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* Given the courseid, return some course related information we want to transport
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*
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* @param int $course the id of the course this backup belongs to
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*/
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public static function backup_get_original_course_info($courseid) {
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global $DB;
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return $DB->get_record('course', array('id' => $courseid), 'fullname, shortname, startdate');
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}
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/**
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* Sets the default values for the settings in a backup operation
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*
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* Based on the mode of the backup it will delegate the process to
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* other methods like {@link apply_general_config_defaults} ...
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* to get proper defaults loaded
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*
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* @param backup_controller $controller
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*/
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public static function apply_config_defaults(backup_controller $controller) {
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// Based on the mode of the backup (general, automated, import, hub...)
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// decide the action to perform to get defaults loaded
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$mode = $controller->get_mode();
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switch ($mode) {
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case backup::MODE_GENERAL:
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// Load the general defaults
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self::apply_general_config_defaults($controller);
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break;
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case backup::MODE_AUTOMATED:
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// TODO: Move the loading from automatic stuff to here
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break;
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default:
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// Nothing to do for other modes (IMPORT/HUB...). Some day we
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// can define defaults (admin UI...) for them if we want to
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}
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}
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/**
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* Sets the controller settings default values from the backup config.
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*
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* @param backup_controller $controller
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*/
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private static function apply_general_config_defaults(backup_controller $controller) {
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$settings = array(
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// Config name => Setting name
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'backup_general_users' => 'users',
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'backup_general_anonymize' => 'anonymize',
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'backup_general_role_assignments' => 'role_assignments',
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'backup_general_activities' => 'activities',
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'backup_general_blocks' => 'blocks',
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'backup_general_filters' => 'filters',
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'backup_general_comments' => 'comments',
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'backup_general_badges' => 'badges',
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'backup_general_userscompletion' => 'userscompletion',
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'backup_general_logs' => 'logs',
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'backup_general_histories' => 'grade_histories'
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);
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$plan = $controller->get_plan();
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foreach ($settings as $config=>$settingname) {
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$value = get_config('backup', $config);
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$locked = (get_config('backup', $config.'_locked') == true);
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if ($plan->setting_exists($settingname)) {
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$setting = $plan->get_setting($settingname);
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if ($setting->get_value() != $value || 1==1) {
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$setting->set_value($value);
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if ($locked) {
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$setting->set_status(base_setting::LOCKED_BY_CONFIG);
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}
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}
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}
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}
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}
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}
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