mirror of
https://github.com/friendica/friendica
synced 2025-02-09 22:58:51 +00:00
53 lines
2.1 KiB
PHP
53 lines
2.1 KiB
PHP
<?php
|
|
|
|
// Copyright (C) 2010-2024, the Friendica project
|
|
// SPDX-FileCopyrightText: 2010-2024 the Friendica project
|
|
//
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
|
|
namespace Friendica\Database;
|
|
|
|
/**
|
|
* Full-text search on a haystack string that isn't present in the database.
|
|
* The haystack is inserted in a temporary table with a FULLTEXT index, then any number of
|
|
* matches can be performed on it before the row is deleted when the class instance is destroyed,
|
|
* either manually or at the end of the script at the latest.
|
|
*/
|
|
class DisposableFullTextSearch
|
|
{
|
|
private Database $db;
|
|
/** @var int Unique identifier of the haystack in the database. */
|
|
private int $identifier;
|
|
|
|
public function __construct(Database $database, string $haystack)
|
|
{
|
|
$this->db = $database;
|
|
|
|
// Unique identifier generation. Two DisposableFullTextSearch object should never have the same as the first object destruction
|
|
// would delete both check-full-text-search rows before the second object destruction is called, leading to unexpected behavior.
|
|
do {
|
|
// Maximum value is indicated by the INT UNSIGNED type of the check-full-text-search.pid field
|
|
$this->identifier = random_int(0, pow(2, 32) - 1);
|
|
} while ($this->db->exists('check-full-text-search', ['pid' => $this->identifier]));
|
|
|
|
// If the `exists()` call fails and return false because the database is unavailable, the `insert()` call will likely fail as well, which means
|
|
// all subsequent calls to `match()` will return false because the haystack won't have been inserted.
|
|
// However, at this point there may be bigger problems to worry about.
|
|
$this->db->insert('check-full-text-search', ['pid' => $this->identifier, 'searchtext' => $haystack]);
|
|
}
|
|
|
|
public function __destruct()
|
|
{
|
|
$this->db->delete('check-full-text-search', ['pid' => $this->identifier]);
|
|
}
|
|
|
|
/**
|
|
* @param string $needle Boolean mode search string
|
|
* @return bool
|
|
* @throws \Exception
|
|
*/
|
|
public function match(string $needle): bool
|
|
{
|
|
return $this->db->exists('check-full-text-search', ["`pid` = ? AND MATCH (`searchtext`) AGAINST (? IN BOOLEAN MODE)", $this->identifier, $needle]);
|
|
}
|
|
}
|