silverstripe-fulltextsearch/code/search/SearchUpdater.php

168 lines
5.9 KiB
PHP

<?php
/**
* This class is responsible for capturing changes to DataObjects and triggering index updates of the resulting dirty index
* items.
*
* Attached automatically by _config calling SearchUpdater#bind_manipulation_capture. Overloads the current database connector's
* manipulate method - basically we need to capture a manipulation _after_ all the augmentManipulation code (for instance Version's)
* is run
*
* Pretty closely tied to the field structure of SearchIndex.
*
* TODO: The way we bind in is awful hacky.
*/
class SearchUpdater extends Object {
/**
* Replace the database object with a subclass that captures all manipulations and passes them to us
*/
static function bind_manipulation_capture() {
global $databaseConfig;
$current = DB::getConn();
if (!$current || @$current->isManipulationCapture) return; // If not yet set, or its already captured, just return
$type = get_class($current);
$file = TEMP_FOLDER."/.cache.SMC.$type";
if (!is_file($file)) {
file_put_contents($file, "<?php
class SearchManipulateCapture_$type extends $type {
public \$isManipulationCapture = true;
function manipulate(\$manipulation) {
\$res = parent::manipulate(\$manipulation);
SearchUpdater::handle_manipulation(\$manipulation);
return \$res;
}
}
");
}
require_once($file);
$dbClass = 'SearchManipulateCapture_'.$type;
$captured = new $dbClass($databaseConfig);
// The connection might have had it's name changed (like if we're currently in a test)
$captured->selectDatabase($current->currentDatabase());
DB::setConn($captured);
}
static $registered = false;
/** @var SearchUpdateProcessor */
static $processor = null;
/**
* Called by the SearchManiplateCapture database adapter with every manipulation made against the database.
*
* Check every index to see what objects need re-inserting into what indexes to keep the index fresh,
* but doesn't actually do it yet.
*
* TODO: This is pretty sensitive to the format of manipulation that DataObject::write produces. Specifically,
* it expects the actual class of the object to be present as a table, regardless of if any fields changed in that table
* (so a class => array( 'fields' => array() ) item), in order to find the actual class for a set of table manipulations
*/
static function handle_manipulation($manipulation) {
// First, extract any state that is in the manipulation itself
foreach ($manipulation as $table => $details) {
$manipulation[$table]['class'] = $table;
$manipulation[$table]['state'] = array();
}
SearchVariant::call('extractManipulationState', $manipulation);
// Then combine the manipulation back into object field sets
$writes = array();
foreach ($manipulation as $table => $details) {
if (!isset($details['id']) || !isset($details['fields'])) continue;
$id = $details['id'];
$state = $details['state'];
$class = $details['class'];
$fields = $details['fields'];
$base = ClassInfo::baseDataClass($class);
$key = "$id:$base:".serialize($state);
$statefulids = array(array('id' => $id, 'state' => $state));
// Is this the first table for this particular object? Then add an item to $writes
if (!isset($writes[$key])) $writes[$key] = array('base' => $base, 'class' => $class, 'id' => $id, 'statefulids' => $statefulids, 'fields' => array());
// Otherwise update the class label if it's more specific than the currently recorded one
else if (is_subclass_of($class, $writes[$key]['class'])) $writes[$key]['class'] = $class;
// Update the fields
foreach ($fields as $field => $value) {
$writes[$key]['fields']["$class:$field"] = $value;
}
}
// Then extract any state that is needed for the writes
SearchVariant::call('extractManipulationWriteState', $writes);
// Then for each write, figure out what objects need updating
foreach ($writes as $write) {
// For every index
foreach (FullTextSearch::get_indexes() as $index => $instance) {
// If that index as a field from this class
if (SearchIntrospection::is_subclass_of($write['class'], $instance->dependancyList)) {
// Get the dirty IDs
$dirtyids = $instance->getDirtyIDs($write['class'], $write['id'], $write['statefulids'], $write['fields']);
// Then add then then to the global list to deal with later
foreach ($dirtyids as $dirtyclass => $ids) {
if ($ids) {
if (!self::$processor) self::$processor = Injector::inst()->create('SearchUpdateProcessor');
self::$processor->addDirtyIDs($dirtyclass, $ids, $index);
}
}
}
}
}
// Finally, if we do have some work to do register the shutdown function to actually do the work
// Don't do it if we're testing - there's no database connection outside the test methods, so we'd
// just get errors
$runningTests = class_exists('SapphireTest',false) && SapphireTest::is_running_test();
if (self::$processor && !self::$registered && !$runningTests) {
register_shutdown_function(array("SearchUpdater", "flush_dirty_indexes"));
self::$registered = true;
}
}
/**
* Throw away the recorded dirty IDs without doing anything with them.
*/
static function clear_dirty_indexes() {
self::$processor = null;
}
/**
* Do something with the recorded dirty IDs, where that "something" depends on the value of self::$update_method,
* either immediately update the indexes, queue a messsage to update the indexes at some point in the future, or
* just throw the dirty IDs away.
*/
static function flush_dirty_indexes() {
if (!self::$processor) return;
self::$processor->triggerProcessing();
self::$processor = null;
}
}
class SearchUpdater_BindManipulationCaptureFilter implements RequestFilter {
public function preRequest(SS_HTTPRequest $request, Session $session, DataModel $model) {
SearchUpdater::bind_manipulation_capture();
}
public function postRequest(SS_HTTPRequest $request, SS_HTTPResponse $response, DataModel $model) {
/* NOP */
}
}