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<?php
/**
* Global Search Engine for Moodle
*
* @package search
* @category core
* @subpackage search_engine
* @author Michael Champanis (mchampan) [cynnical@gmail.com], Valery Fremaux [valery.fremaux@club-internet.fr] > 1.8
* @date 2008/03/31
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
*
* Index asynchronous updator
*
* Major chages in this review is passing the xxxx_db_names return to
* multiple arity to handle multiple document types modules
*/
/**
* includes and requires
*/
require_once('../config.php');
if (!defined('MOODLE_INTERNAL')) {
die('Direct access to this script is forbidden.'); /// It must be included from the cron script
}
/// makes inclusions of the Zend Engine more reliable
ini_set('include_path', $CFG->dirroot.DIRECTORY_SEPARATOR.'search'.DIRECTORY_SEPARATOR.PATH_SEPARATOR.ini_get('include_path'));
require_once($CFG->dirroot.'/search/lib.php');
require_once($CFG->dirroot.'/search/indexlib.php');
/// checks global search activation
// require_login();
if (empty($CFG->enableglobalsearch)) {
error(get_string('globalsearchdisabled', 'search'));
}
/*
Obsolete with the MOODLE INTERNAL check
if (!has_capability('moodle/site:doanything', get_context_instance(CONTEXT_SYSTEM))) {
error(get_string('beadmin', 'search'), "$CFG->wwwroot/login/index.php");
}
*/
try {
$index = new Zend_Search_Lucene(SEARCH_INDEX_PATH);
} catch(LuceneException $e) {
mtrace("Could not construct a valid index. Maybe the first indexation was never made, or files might be corrupted. Run complete indexation again.");
return;
}
$dbcontrol = new IndexDBControl();
$update_count = 0;
$indexdate = @$CFG->search_indexer_update_date;
$startupdatedate = time();
/// indexing changed resources
mtrace("Starting index update (updates)...\n");
if ($mods = get_records_select('modules')) {
$mods = array_merge($mods, search_get_additional_modules());
foreach ($mods as $mod) {
$class_file = $CFG->dirroot.'/search/documents/'.$mod->name.'_document.php';
$get_document_function = $mod->name.'_single_document';
$delete_function = $mod->name.'_delete';
$db_names_function = $mod->name.'_db_names';
$updates = array();
if (file_exists($class_file)) {
require_once($class_file);
//if both required functions exist
if (function_exists($delete_function) and function_exists($db_names_function) and function_exists($get_document_function)) {
mtrace("Checking $mod->name module for updates.");
$valuesArray = $db_names_function();
if ($valuesArray){
foreach($valuesArray as $values){
$where = (!empty($values[5])) ? 'AND ('.$values[5].')' : '';
$itemtypes = ($values[4] != '*' && $values[4] != 'any') ? " AND itemtype = '{$values[4]}' " : '' ;
//TODO: check 'in' syntax with other RDBMS' (add and update.php as well)
$table = SEARCH_DATABASE_TABLE;
$query = "
SELECT
docid,
itemtype
FROM
{$CFG->prefix}{$table}
WHERE
doctype = '{$values[1]}'
$itemtypes
";
$docIds = get_records_sql_menu($query, array($mod->name));
$docIdList = ($docIds) ? implode("','", array_keys($docIds)) : '' ;
$query = "
SELECT
id,
{$values[0]} as docid
FROM
{$CFG->prefix}{$values[1]}
WHERE
{$values[3]} > {$indexdate} AND
id IN ('{$docIdList}')
$where
";
$records = get_records_sql($query);
if (is_array($records)) {
foreach($records as $record) {
$updates[] = $delete_function($record->docid, $docIds[$record->docid]);
}
}
}
foreach ($updates as $update) {
++$update_count;
//delete old document
$doc = $index->find("+docid:{$update->id} +doctype:{$mod->name} +itemtype:{$update->itemtype}");
//get the record, should only be one
foreach ($doc as $thisdoc) {
mtrace(" Delete: $thisdoc->title (database id = $thisdoc->dbid, index id = $thisdoc->id, moodle instance id = $thisdoc->docid)");
$dbcontrol->delDocument($thisdoc);
$index->delete($thisdoc->id);
}
//add new modified document back into index
if (!$add = $get_document_function($update->id, $update->itemtype)){
// ignore on errors
continue;
}
//object to insert into db
$dbid = $dbcontrol->addDocument($add);
//synchronise db with index
$add->addField(Zend_Search_Lucene_Field::Keyword('dbid', $dbid));
mtrace(" Add: $add->title (database id = $add->dbid, moodle instance id = $add->docid)");
$index->addDocument($add);
}
}
else{
mtrace("No types to update.\n");
}
mtrace("Finished $mod->name.\n");
}
}
}
}
//commit changes
$index->commit();
//update index date
set_config("search_indexer_update_date", $startupdatedate);
mtrace("Finished $update_count updates");
?>
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