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<?php |
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/****************************************************************************** |
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* Wikipedia Account Creation Assistance tool * |
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* * |
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* All code in this file is released into the public domain by the ACC * |
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* Development Team. Please see team.json for a list of contributors. * |
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******************************************************************************/ |
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namespace Waca; |
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use Exception; |
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use PDO; |
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use PDOException; |
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use Waca\Exceptions\EnvironmentException; |
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class PdoDatabase extends PDO |
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{ |
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public const ISOLATION_SERIALIZABLE = 'SERIALIZABLE'; |
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public const ISOLATION_READ_COMMITTED = 'READ COMMITTED'; |
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public const ISOLATION_READ_ONLY = 'READ ONLY'; |
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private static ?PdoDatabase $connection = null; |
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/** |
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* @var bool True if a transaction is active |
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*/ |
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protected bool $hasActiveTransaction = false; |
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/** |
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* Unless you're doing low-level work, this is not the function you want. |
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* |
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* @throws Exception |
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*/ |
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public static function getDatabaseConnection(SiteConfiguration $configuration): PdoDatabase |
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{ |
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if (self::$connection === null) { |
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$dbConfig = $configuration->getDatabaseConfig(); |
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try { |
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$databaseObject = new PdoDatabase( |
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$dbConfig['datasource'], |
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$dbConfig['username'], |
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$dbConfig['password'], |
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[PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8mb4 COLLATE utf8mb4_unicode_520_ci'] |
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); |
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} |
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catch (PDOException $ex) { |
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// wrap around any potential stack traces which may include passwords |
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throw new EnvironmentException('Error connecting to database: ' . $ex->getMessage()); |
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} |
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$databaseObject->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); |
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// emulating prepared statements gives a performance boost on MySQL. |
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// |
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// however, our version of PDO doesn't seem to understand parameter types when emulating |
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// the prepared statements, so we're forced to turn this off for now. |
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// -- stw 2014-02-11 |
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// |
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// and that's not the only problem with emulated prepares. We've now got code that relies |
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// on real prepares. |
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// -- stw 2023-09-30 |
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$databaseObject->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); |
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// Set the default transaction mode |
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$databaseObject->exec('SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;'); |
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self::$connection = $databaseObject; |
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} |
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return self::$connection; |
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} |
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/** |
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* Determines if this connection has a transaction in progress or not |
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* @return boolean true if there is a transaction in progress. |
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*/ |
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public function hasActiveTransaction(): bool |
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{ |
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return $this->hasActiveTransaction; |
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} |
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public function beginTransaction(string $isolationLevel = self::ISOLATION_READ_COMMITTED): bool |
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{ |
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// Override the pre-existing method, which doesn't stop you from |
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// starting transactions within transactions - which doesn't work and |
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// will throw an exception. This eliminates the need to catch exceptions |
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// all over the rest of the code |
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if ($this->hasActiveTransaction) { |
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return false; |
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} |
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else { |
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$accessMode = 'READ WRITE'; |
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switch ($isolationLevel) { |
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case self::ISOLATION_SERIALIZABLE: |
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case self::ISOLATION_READ_COMMITTED: |
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break; |
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case self::ISOLATION_READ_ONLY: |
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$isolationLevel = self::ISOLATION_READ_COMMITTED; |
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$accessMode = 'READ ONLY'; |
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break; |
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default: |
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throw new Exception('Invalid transaction isolation level'); |
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} |
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// set the transaction isolation level for every transaction. |
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// string substitution is safe here; values can only be one of the above constants |
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parent::exec("SET TRANSACTION ISOLATION LEVEL ${isolationLevel}, ${accessMode};"); |
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// start a new transaction, and return whether the start was successful |
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$this->hasActiveTransaction = parent::beginTransaction(); |
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return $this->hasActiveTransaction; |
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} |
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} |
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/** |
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* Commits the active transaction |
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*/ |
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public function commit(): void |
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{ |
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if ($this->hasActiveTransaction) { |
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parent::commit(); |
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$this->hasActiveTransaction = false; |
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} |
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} |
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/** |
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* Rolls back a transaction |
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*/ |
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public function rollBack(): void |
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{ |
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if ($this->hasActiveTransaction) { |
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parent::rollback(); |
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$this->hasActiveTransaction = false; |
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} |
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} |
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} |
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enwikipedia-acc /
waca
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