JezK

Edit File: TransactionLevel.php

<?php /** * Matomo - free/libre analytics platform * * @link https://matomo.org * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later */ namespace Piwik\Db; use Piwik\Db; use Piwik\Option; class TransactionLevel { public const TEST_OPTION_NAME = 'TransactionLevel.testOption'; private $statusBackup; /** * @var TransactionalDatabaseInterface $transactionalDatabase */ private $transactionalDatabase; public function __construct(\Piwik\Db\TransactionalDatabaseInterface $transactionalDatabase) { $this->transactionalDatabase = $transactionalDatabase; } public function canLikelySetTransactionLevel() { $dbSettings = new Db\Settings(); return strtolower($dbSettings->getEngine()) === 'innodb'; } /** * @deprecated Use `setTransactionLevelForNonLockingReads` */ public function setUncommitted() { return $this->setTransactionLevelForNonLockingReads(); } public function setTransactionLevelForNonLockingReads() : bool { if ($this->transactionalDatabase->getSupportsTransactionLevelForNonLockingReads() === \false) { // we know "Uncommitted" transaction level is not supported, we don't need to do anything as it won't work to set the status return \false; } try { $backup = $this->transactionalDatabase->getCurrentTransactionIsolationLevelForSession(); } catch (\Exception $e) { $this->transactionalDatabase->setSupportsTransactionLevelForNonLockingReads(\false); return \false; } try { $this->transactionalDatabase->setTransactionIsolationLevel(\Piwik\Db\Schema::getInstance()->getSupportedReadIsolationTransactionLevel()); $this->statusBackup = $backup; if ($this->transactionalDatabase->getSupportsTransactionLevelForNonLockingReads() === null) { // the first time we need to check if the transaction level actually works by // trying to set something w/ the new transaction isolation level Option::set(self::TEST_OPTION_NAME, '1'); } $this->transactionalDatabase->setSupportsTransactionLevelForNonLockingReads(\true); } catch (\Exception $e) { // setting the transaction level status did not work // catch eg 1665 Cannot execute statement: impossible to write to binary log since BINLOG_FORMAT = STATEMENT and at least one table uses a storage engine limited to row-based logging. InnoDB is limited to row-logging when transaction isolation level is READ COMMITTED or READ UNCOMMITTED $this->transactionalDatabase->setSupportsTransactionLevelForNonLockingReads(\false); $this->restorePreviousStatus(); return \false; } return \true; } public function restorePreviousStatus() { if ($this->statusBackup) { $value = strtoupper($this->statusBackup); $this->statusBackup = null; $value = str_replace('-', ' ', $value); if (in_array($value, array('REPEATABLE READ', 'READ COMMITTED', 'SERIALIZABLE'))) { $this->transactionalDatabase->setTransactionIsolationLevel($value); } elseif ($value !== 'READ UNCOMMITTED') { $this->transactionalDatabase->setTransactionIsolationLevel('REPEATABLE READ'); } } } }