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238 lines
8.5 KiB
238 lines
8.5 KiB
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Bridge\Doctrine\HttpFoundation;
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use Doctrine\DBAL\Connection;
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use Doctrine\DBAL\Driver\DriverException;
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use Doctrine\DBAL\Platforms\SQLServer2008Platform;
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/**
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* DBAL based session storage.
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*
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* This implementation is very similar to Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler
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* but uses a Doctrine connection and thus also works with non-PDO-based drivers like mysqli and OCI8.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Johannes M. Schmitt <schmittjoh@gmail.com>
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* @author Tobias Schultze <http://tobion.de>
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*/
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class DbalSessionHandler implements \SessionHandlerInterface
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{
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/**
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* @var Connection
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*/
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private $con;
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/**
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* @var string
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*/
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private $table;
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/**
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* @var string Column for session id
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*/
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private $idCol = 'sess_id';
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/**
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* @var string Column for session data
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*/
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private $dataCol = 'sess_data';
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/**
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* @var string Column for timestamp
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*/
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private $timeCol = 'sess_time';
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/**
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* Constructor.
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*
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* @param Connection $con A connection
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* @param string $tableName Table name
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*/
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public function __construct(Connection $con, $tableName = 'sessions')
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{
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$this->con = $con;
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$this->table = $tableName;
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}
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/**
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* {@inheritdoc}
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*/
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public function open($savePath, $sessionName)
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{
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return true;
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}
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/**
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* {@inheritdoc}
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*/
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public function close()
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{
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return true;
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}
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/**
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* {@inheritdoc}
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*/
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public function destroy($sessionId)
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{
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// delete the record associated with this id
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$sql = "DELETE FROM $this->table WHERE $this->idCol = :id";
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try {
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$stmt = $this->con->prepare($sql);
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$stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$stmt->execute();
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} catch (\Exception $e) {
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throw new \RuntimeException(sprintf('Exception was thrown when trying to delete a session: %s', $e->getMessage()), 0, $e);
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}
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return true;
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}
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/**
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* {@inheritdoc}
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*/
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public function gc($maxlifetime)
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{
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// delete the session records that have expired
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$sql = "DELETE FROM $this->table WHERE $this->timeCol < :time";
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try {
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$stmt = $this->con->prepare($sql);
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$stmt->bindValue(':time', time() - $maxlifetime, \PDO::PARAM_INT);
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$stmt->execute();
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} catch (\Exception $e) {
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throw new \RuntimeException(sprintf('Exception was thrown when trying to delete expired sessions: %s', $e->getMessage()), 0, $e);
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}
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return true;
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}
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/**
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* {@inheritdoc}
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*/
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public function read($sessionId)
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{
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$sql = "SELECT $this->dataCol FROM $this->table WHERE $this->idCol = :id";
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try {
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$stmt = $this->con->prepare($sql);
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$stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$stmt->execute();
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// We use fetchAll instead of fetchColumn to make sure the DB cursor gets closed
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$sessionRows = $stmt->fetchAll(\PDO::FETCH_NUM);
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if ($sessionRows) {
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return base64_decode($sessionRows[0][0]);
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}
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return '';
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} catch (\Exception $e) {
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throw new \RuntimeException(sprintf('Exception was thrown when trying to read the session data: %s', $e->getMessage()), 0, $e);
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function write($sessionId, $data)
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{
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$encoded = base64_encode($data);
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try {
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// We use a single MERGE SQL query when supported by the database.
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$mergeSql = $this->getMergeSql();
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if (null !== $mergeSql) {
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$mergeStmt = $this->con->prepare($mergeSql);
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$mergeStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$mergeStmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
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$mergeStmt->bindValue(':time', time(), \PDO::PARAM_INT);
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$mergeStmt->execute();
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return true;
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}
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$updateStmt = $this->con->prepare(
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"UPDATE $this->table SET $this->dataCol = :data, $this->timeCol = :time WHERE $this->idCol = :id"
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);
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$updateStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$updateStmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
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$updateStmt->bindValue(':time', time(), \PDO::PARAM_INT);
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$updateStmt->execute();
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// When MERGE is not supported, like in Postgres, we have to use this approach that can result in
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// duplicate key errors when the same session is written simultaneously. We can just catch such an
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// error and re-execute the update. This is similar to a serializable transaction with retry logic
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// on serialization failures but without the overhead and without possible false positives due to
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// longer gap locking.
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if (!$updateStmt->rowCount()) {
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try {
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$insertStmt = $this->con->prepare(
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"INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time)"
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);
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$insertStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$insertStmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
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$insertStmt->bindValue(':time', time(), \PDO::PARAM_INT);
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$insertStmt->execute();
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} catch (\Exception $e) {
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$driverException = $e->getPrevious();
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// Handle integrity violation SQLSTATE 23000 (or a subclass like 23505 in Postgres) for duplicate keys
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// DriverException only available since DBAL 2.5
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if (
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($driverException instanceof DriverException && 0 === strpos($driverException->getSQLState(), '23')) ||
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($driverException instanceof \PDOException && 0 === strpos($driverException->getCode(), '23'))
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) {
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$updateStmt->execute();
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} else {
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throw $e;
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}
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}
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}
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} catch (\Exception $e) {
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throw new \RuntimeException(sprintf('Exception was thrown when trying to write the session data: %s', $e->getMessage()), 0, $e);
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}
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return true;
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}
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/**
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* Returns a merge/upsert (i.e. insert or update) SQL query when supported by the database.
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*
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* @return string|null The SQL string or null when not supported
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*/
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private function getMergeSql()
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{
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$platform = $this->con->getDatabasePlatform()->getName();
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switch ($platform) {
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case 'mysql':
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return "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) ".
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"ON DUPLICATE KEY UPDATE $this->dataCol = VALUES($this->dataCol), $this->timeCol = VALUES($this->timeCol)";
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case 'oracle':
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// DUAL is Oracle specific dummy table
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return "MERGE INTO $this->table USING DUAL ON ($this->idCol = :id) ".
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"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) ".
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"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data, $this->timeCol = :time";
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case $this->con->getDatabasePlatform() instanceof SQLServer2008Platform:
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// MERGE is only available since SQL Server 2008 and must be terminated by semicolon
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// It also requires HOLDLOCK according to http://weblogs.sqlteam.com/dang/archive/2009/01/31/UPSERT-Race-Condition-With-MERGE.aspx
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return "MERGE INTO $this->table WITH (HOLDLOCK) USING (SELECT 1 AS dummy) AS src ON ($this->idCol = :id) ".
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"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) ".
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"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data, $this->timeCol = :time;";
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case 'sqlite':
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return "INSERT OR REPLACE INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time)";
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}
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}
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}
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