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* Global Search Engine for Moodle
* @package search
* @category core
* @subpackage search_engine
* @author Michael Champanis (mchampan) [], Valery Fremaux [] > 1.8
* @date 2008/03/31
* @license GNU Public License
* The indexer logic -
* Look through each installed module's or block's search document class file (/search/documents)
* for necessary search functions, and if they're present add the content to the index.
* Repeat this for blocks.
* Because the iterator/retrieval functions are now stored in /search/documents/<mod>_document.php,
* /mod/mod/lib.php doesn't have to be modified - and thus the search module becomes quite
* self-sufficient. URL's are now stored in the index, stopping us from needing to require
* the class files to generate a results page.
* Along with the index data, each document's summary gets stored in the database
* and synchronised to the index (flat file) via the primary key ('id') which is mapped
* to the 'dbid' field in the index
* */
//this'll take some time, set up the environment
* includes and requires
ini_set('include_path', $CFG->dirroot.DIRECTORY_SEPARATOR.'search'.DIRECTORY_SEPARATOR.PATH_SEPARATOR.ini_get('include_path'));
/// only administrators can index the moodle installation, because access to all pages is required
if (empty($CFG->enableglobalsearch)) {
error(get_string('globalsearchdisabled', 'search'));
if (!has_capability('moodle/site:doanything', get_context_instance(CONTEXT_SYSTEM))) {
error(get_string('beadmin', 'search'), "$CFG->wwwroot/login/index.php");
/// confirmation flag to prevent accidental reindexing (indexersplash.php is the correct entry point)
$sure = strtolower(optional_param('areyousure', '', PARAM_ALPHA));
if ($sure != 'yes') {
mtrace("<pre>Sorry, you need to confirm indexing via <a href='indexersplash.php'>indexersplash.php</a>"
.". (<a href='index.php'>Back to query page</a>).</pre>");
/// check for php5 (lib.php)
//php5 found, continue including php5-only files
mtrace('<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8" /></head><body>');
mtrace('<pre>Server Time: '.date('r',time())."\n");
if (isset($CFG->search_indexer_busy) && $CFG->search_indexer_busy == '1') {
//means indexing was not finished previously
mtrace("Warning: Indexing was not successfully completed last time, restarting.\n");
/// turn on busy flag
set_config('search_indexer_busy', '1');
$index_path = SEARCH_INDEX_PATH;
$index_db_file = "{$CFG->dirroot}/search/db/$CFG->dbtype.sql";
$dbcontrol = new IndexDBControl();
/// setup directory in data root
if (!file_exists($index_path)) {
mtrace("Data directory ($index_path) does not exist, attempting to create.");
if (!mkdir($index_path)) {
search_pexit("Error creating data directory at: $index_path. Please correct.");
else {
mtrace("Directory successfully created.");
else {
mtrace("Using {$index_path} as data directory.");
Zend_Search_Lucene_Analysis_Analyzer::setDefault(new Zend_Search_Lucene_Analysis_Analyzer_Common_Utf8_CaseInsensitive());
$index = new Zend_Search_Lucene($index_path, true);
OBSOLETE REGENERATION - DB installs with search block by now
if (!$dbcontrol->checkDB()) {
search_pexit("Database error. Please check settings/files.");
/// New regeneration
mtrace('Deleting old index entries.');
/// begin timer
mtrace("Starting activity modules\n");
//the presence of the required search functions -
// * mod_iterator
// * mod_get_content_for_index
//are the sole basis for including a module in the index at the moment.
$searchables = search_collect_searchables();
/// start indexation
if ($searchables){
foreach ($searchables as $mod) {
echo "start {$mod->name}";
$key = 'search_in_'.$mod->name;
if (isset($CFG->$key) && !$CFG->$key) {
mtrace("module $key has been administratively disabled. Skipping...\n");
if ($mod->location == 'internal'){
$class_file = $CFG->dirroot.'/search/documents/'.$mod->name.'_document.php';
} else {
$class_file = $CFG->dirroot.'/'.$mod->location.'/'.$mod->name.'/search_document.php';
if (!file_exists($class_file)){
if (defined("PATH_FOR_SEARCH_TYPE_{$mod->name}")){
eval("\$pluginpath = PATH_FOR_SEARCH_TYPE_{$mod->name}");
$class_file = "{$CFG->dirroot}/{$pluginpath}/searchlib.php";
} else {
mtrace ("No search document found for plugin {$mod->name}. Ignoring.");
if (file_exists($class_file)) {
//build function names
$iter_function = $mod->name.'_iterator';
$index_function = $mod->name.'_get_content_for_index';
$counter = 0;
if (function_exists($index_function) && function_exists($iter_function)) {
mtrace("Processing module function $index_function ...");
$sources = $iter_function();
if ($sources){
foreach ($sources as $i) {
$documents = $index_function($i);
//begin transaction
if ($documents){
foreach($documents as $document) {
//object to insert into db
$dbid = $dbcontrol->addDocument($document);
//synchronise db with index
$document->addField(Zend_Search_Lucene_Field::Keyword('dbid', $dbid));
//add document to index
//commit every x new documents, and print a status message
if (($counter % 2000) == 0) {
mtrace(".. $counter");
//end transaction
//commit left over documents, and finish up
mtrace("-- $counter documents indexed");
} else {
mtrace ("No search document found for plugin {$mod->name}. Ignoring.");
/// finished modules
mtrace('Finished activity modules');
mtrace(".<br/><a href='index.php'>Back to query page</a>.");
/// finished, turn busy flag off
set_config('search_indexer_busy', '0');
/// mark the time we last updated
set_config('search_indexer_run_date', time());
/// and the index size
set_config('search_index_size', (int)$index->count());
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