Issue #2733675 by smccabe, murilohp, andregp, Johnny Santos, ankithashetty,... (feae261b) · Commits · project / drupal

core/assets/scaffold/files/default.settings.php

+15 −0

Original line number	Diff line number	Diff line
		@@ -138,6 +138,21 @@
		* request as needed. The fourth line creates a new database with a name of
		* "extra".
		*
		* For MySQL, MariaDB or equivalent databases the 'isolation_level' option can
		* be set. The recommended transaction isolation level for Drupal sites is
		* 'READ COMMITTED'. The 'REPEATABLE READ' option is supported but can result
		* in deadlocks, the other two options are 'READ UNCOMMITTED' and 'SERIALIZABLE'.
		* They are available but not supported; use them at your own risk. For more
		* info:
		* https://dev.mysql.com/doc/refman/5.7/en/innodb-transaction-isolation-levels.html
		*
		* On your settings.php, change the isolation level:
		* @code
		* $databases['default']['default']['init_commands'] = [
		* 'isolation_level' => 'SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED',
		* ];
		* @endcode
		*
		* You can optionally set a prefix for all database table names by using the
		* 'prefix' setting. If a prefix is specified, the table name will be prepended
		* with its value. Be sure to use valid database characters only, usually

core/modules/mysql/mysql.install

0 → 100644

+45 −0

Original line number	Diff line number	Diff line
		<?php

		/**
		* @file
		* Install, update and uninstall functions for the mysql module.
		*/

		use Drupal\Core\Database\Database;

		/**
		* Implements hook_requirements().
		*/
		function mysql_requirements($phase) {
		$requirements = [];

		if ($phase === 'runtime') {
		// Test with MySql databases.
		if (Database::isActiveConnection()) {
		$connection = Database::getConnection();

		$query = 'SELECT @@SESSION.tx_isolation';
		// The database variable "tx_isolation" has been removed in MySQL v8.0 and
		// has been replaced by "transaction_isolation".
		// @see https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_tx_isolation
		if (!$connection->isMariaDb() && version_compare($connection->version(), '8.0.0-AnyName', '>')) {
		$query = 'SELECT @@SESSION.transaction_isolation';
		}

		$isolation_level = $connection->query($query)->fetchField();

		if ($isolation_level !== 'READ-COMMITTED') {
		$requirements['mysql_transaction_level'] = [
		'title' => t('Database Isolation Level'),
		'severity' => REQUIREMENT_WARNING,
		'value' => t('Transaction Isolation Level: @value', ['@value' => $isolation_level]),
		'description' => t('For the best performance and to minimize locking issues, the READ-COMMITTED transaction isolation level is <a href=":performance_doc">recommended</a>.', [
		':performance_doc' => 'https://www.drupal.org/docs/system-requirements/setting-the-mysql-transaction-isolation-level',
		]),
		];
		}
		}
		}

		return $requirements;
		}

core/modules/mysql/tests/src/Functional/RequirementsTest.php

0 → 100644

+88 −0

Original line number	Diff line number	Diff line
		<?php

		namespace Drupal\Tests\mysql\Functional;

		use Drupal\Core\Database\Database;
		use Drupal\Tests\BrowserTestBase;

		/**
		* Tests isolation level warning when the config is set in settings.php.
		*
		* @group mysql
		*/
		class RequirementsTest extends BrowserTestBase {

		/**
		* {@inheritdoc}
		*/
		protected static $modules = ['mysql'];

		/**
		* {@inheritdoc}
		*/
		protected $defaultTheme = 'stark';

		/**
		* {@inheritdoc}
		*/
		protected function setUp(): void {
		parent::setUp();

		// The isolation_level option is only available for MySQL.
		$connectionInfo = Database::getConnectionInfo();
		if ($connectionInfo['default']['driver'] !== 'mysql') {
		$this->markTestSkipped("This test does not support the {$connectionInfo['default']['driver']} database driver.");
		}
		}

		/**
		* Test the isolation level warning message on status page.
		*/
		public function testIsolationLevelWarningNotDisplaying() {
		$admin_user = $this->drupalCreateUser([
		'administer site configuration',
		'access site reports',
		]);
		$this->drupalLogin($admin_user);

		// Change the isolation level to force the warning message.
		$this->writeIsolationLevelSettings('REPEATABLE READ');

		// Check if the warning message is being displayed.
		$this->drupalGet('admin/reports/status');
		$elements = $this->xpath('//details[@class="system-status-report__entry"]//div[contains(text(), :text)]', [
		':text' => 'For the best performance and to minimize locking issues, the READ-COMMITTED',
		]);
		$this->assertCount(1, $elements);
		$this->assertStringStartsWith('Transaction Isolation Level', $elements[0]->getParent()->getText());

		// Rollback the isolation level to read committed.
		$this->writeIsolationLevelSettings('READ COMMITTED');

		// Check if the warning message is gone.
		$this->drupalGet('admin/reports/status');
		$this->assertSession()->pageTextNotContains('Database Isolation Level');
		$elements = $this->xpath('//details[@class="system-status-report__entry"]//div[contains(text(), :text)]', [
		':text' => 'For the best performance and to minimize locking issues, the READ-COMMITTED',
		]);

		$this->assertCount(0, $elements);
		}

		/**
		* Writes the isolation level in settings.php.
		*
		* @param string $isolation_level
		* The isolation level.
		*/
		private function writeIsolationLevelSettings(string $isolation_level) {
		$settings['databases']['default']['default']['init_commands'] = (object) [
		'value' => [
		'isolation' => "SET SESSION TRANSACTION ISOLATION LEVEL {$isolation_level}",
		],
		'required' => TRUE,
		];
		$this->writeSettings($settings);
		}

		}

sites/default/default.settings.php

+15 −0

Original line number	Diff line number	Diff line
		@@ -138,6 +138,21 @@
		* request as needed. The fourth line creates a new database with a name of
		* "extra".
		*
		* For MySQL, MariaDB or equivalent databases the 'isolation_level' option can
		* be set. The recommended transaction isolation level for Drupal sites is
		* 'READ COMMITTED'. The 'REPEATABLE READ' option is supported but can result
		* in deadlocks, the other two options are 'READ UNCOMMITTED' and 'SERIALIZABLE'.
		* They are available but not supported; use them at your own risk. For more
		* info:
		* https://dev.mysql.com/doc/refman/5.7/en/innodb-transaction-isolation-levels.html
		*
		* On your settings.php, change the isolation level:
		* @code
		* $databases['default']['default']['init_commands'] = [
		* 'isolation_level' => 'SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED',
		* ];
		* @endcode
		*
		* You can optionally set a prefix for all database table names by using the
		* 'prefix' setting. If a prefix is specified, the table name will be prepended
		* with its value. Be sure to use valid database characters only, usually