[HttpFoundation] implement session locking for PDO
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@ -12,6 +12,14 @@
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/**
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* SessionHandlerInterface for PHP < 5.4
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*
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* The order in which these methods are invoked by PHP are:
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* 1. open [session_start]
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* 2. read
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* 3. gc [optional depending on probability settings: gc_probability / gc_divisor]
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* 4. destroy [optional when session_regenerate_id(true) is used]
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* 5. write [session_write_close] or destroy [session_destroy]
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* 6. close
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*
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* Extensive documentation can be found at php.net, see links:
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*
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* @see http://php.net/sessionhandlerinterface
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@ -19,6 +27,7 @@
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* @see http://php.net/session-set-save-handler
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*
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* @author Drak <drak@zikula.org>
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* @author Tobias Schultze <http://tobion.de>
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*/
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interface SessionHandlerInterface
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{
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@ -57,6 +66,9 @@ interface SessionHandlerInterface
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/**
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* Writes the session data to the storage.
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*
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* Care, the session ID passed to write() can be different from the one previously
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* received in read() when the session ID changed due to session_regenerate_id().
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*
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* @see http://php.net/sessionhandlerinterface.write
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*
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* @param string $sessionId Session ID , see http://php.net/function.session-id
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@ -12,7 +12,19 @@
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namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
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/**
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* PdoSessionHandler.
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* Session handler using a PDO connection to read and write data.
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*
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* It works with MySQL, PostgreSQL, Oracle, SQL Server and SQLite and implements
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* locking of sessions to prevent loss of data by concurrent access to the same session.
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* This means requests for the same session will wait until the other one finished.
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* PHPs internal files session handler also works this way.
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*
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* Attention: Since SQLite does not support row level locks but locks the whole database,
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* it means only one session can be accessed at a time. Even different sessions would wait
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* for another to finish. So saving session in SQLite should only be considered for
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* development or prototypes.
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*
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* @see http://php.net/sessionhandlerinterface
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Michael Williams <michael.williams@funsational.com>
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@ -25,6 +37,11 @@ class PdoSessionHandler implements \SessionHandlerInterface
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*/
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private $pdo;
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/**
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* @var string Database driver
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*/
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private $driver;
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/**
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* @var string Table name
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*/
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@ -45,39 +62,50 @@ class PdoSessionHandler implements \SessionHandlerInterface
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*/
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private $timeCol;
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/**
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* @var bool Whether a transaction is active
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*/
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private $inTransaction = false;
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/**
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* @var bool Whether gc() has been called
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*/
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private $gcCalled = false;
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/**
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* Constructor.
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*
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* List of available options:
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* * db_table: The name of the table [required]
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* * db_table: The name of the table [default: sessions]
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* * db_id_col: The column where to store the session id [default: sess_id]
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* * db_data_col: The column where to store the session data [default: sess_data]
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* * db_time_col: The column where to store the timestamp [default: sess_time]
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*
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* @param \PDO $pdo A \PDO instance
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* @param array $dbOptions An associative array of DB options
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* @param \PDO $pdo A \PDO instance
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* @param array $options An associative array of DB options
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*
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* @throws \InvalidArgumentException When "db_table" option is not provided
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* @throws \InvalidArgumentException When PDO error mode is not PDO::ERRMODE_EXCEPTION
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*/
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public function __construct(\PDO $pdo, array $dbOptions = array())
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public function __construct(\PDO $pdo, array $options = array())
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{
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if (!array_key_exists('db_table', $dbOptions)) {
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throw new \InvalidArgumentException('You must provide the "db_table" option for a PdoSessionStorage.');
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}
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if (\PDO::ERRMODE_EXCEPTION !== $pdo->getAttribute(\PDO::ATTR_ERRMODE)) {
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throw new \InvalidArgumentException(sprintf('"%s" requires PDO error mode attribute be set to throw Exceptions (i.e. $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION))', __CLASS__));
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}
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$this->pdo = $pdo;
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$dbOptions = array_merge(array(
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$this->driver = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME);
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$options = array_replace(array(
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'db_table' => 'sessions',
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'db_id_col' => 'sess_id',
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'db_data_col' => 'sess_data',
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'db_time_col' => 'sess_time',
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), $dbOptions);
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), $options);
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$this->table = $dbOptions['db_table'];
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$this->idCol = $dbOptions['db_id_col'];
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$this->dataCol = $dbOptions['db_data_col'];
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$this->timeCol = $dbOptions['db_time_col'];
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$this->table = $options['db_table'];
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$this->idCol = $options['db_id_col'];
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$this->dataCol = $options['db_data_col'];
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$this->timeCol = $options['db_time_col'];
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}
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/**
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@ -85,14 +113,56 @@ class PdoSessionHandler implements \SessionHandlerInterface
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*/
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public function open($savePath, $sessionName)
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{
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$this->gcCalled = false;
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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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public function read($sessionId)
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{
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$this->beginTransaction();
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try {
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$this->lockSession($sessionId);
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// We need to make sure we do not return session data that is already considered garbage according
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// to the session.gc_maxlifetime setting because gc() is called after read() and only sometimes.
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$maxlifetime = (int) ini_get('session.gc_maxlifetime');
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$sql = "SELECT $this->dataCol FROM $this->table WHERE $this->idCol = :id AND $this->timeCol > :time";
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$stmt = $this->pdo->prepare($sql);
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$stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$stmt->bindValue(':time', time() - $maxlifetime, \PDO::PARAM_INT);
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$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 (\PDOException $e) {
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$this->rollback();
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throw $e;
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function gc($maxlifetime)
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{
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// We delay gc() to close() so that it is executed outside the transactional and blocking read-write process.
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// This way, pruning expired sessions does not block them from being started while the current session is used.
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$this->gcCalled = true;
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return true;
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}
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@ -109,56 +179,14 @@ class PdoSessionHandler implements \SessionHandlerInterface
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$stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$stmt->execute();
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} catch (\PDOException $e) {
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throw new \RuntimeException(sprintf('PDOException was thrown when trying to delete a session: %s', $e->getMessage()), 0, $e);
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$this->rollback();
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throw $e;
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}
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return true;
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}
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/**
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* {@inheritdoc}
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*/
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public function gc($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 = $this->pdo->prepare($sql);
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$stmt->bindValue(':time', time() - $maxlifetime, \PDO::PARAM_INT);
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$stmt->execute();
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} catch (\PDOException $e) {
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throw new \RuntimeException(sprintf('PDOException 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 = $this->pdo->prepare($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 (\PDOException $e) {
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throw new \RuntimeException(sprintf('PDOException was thrown when trying to read the session data: %s', $e->getMessage()), 0, $e);
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}
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}
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/**
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* {@inheritdoc}
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*/
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@ -167,8 +195,10 @@ class PdoSessionHandler implements \SessionHandlerInterface
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// Session data can contain non binary safe characters so we need to encode it.
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$encoded = base64_encode($data);
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// The session ID can be different from the one previously received in read()
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// when the session ID changed due to session_regenerate_id(). So we have to
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// do an insert or update even if we created a row in read() for locking.
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// We use a MERGE SQL query when supported by the database.
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// Otherwise we have to use a transactional DELETE followed by INSERT to prevent duplicate entries under high concurrency.
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try {
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$mergeSql = $this->getMergeSql();
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@ -183,15 +213,18 @@ class PdoSessionHandler implements \SessionHandlerInterface
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return true;
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}
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$this->pdo->beginTransaction();
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try {
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$deleteStmt = $this->pdo->prepare(
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"DELETE FROM $this->table WHERE $this->idCol = :id"
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);
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$deleteStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$deleteStmt->execute();
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$updateStmt = $this->pdo->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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$updateStmt->execute();
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// Since we have a lock on the session, this is safe to do. Otherwise it would be prone to
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// race conditions in high concurrency. And if it's a regenerated session ID it should be
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// unique anyway.
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if (!$updateStmt->rowCount()) {
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$insertStmt = $this->pdo->prepare(
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"INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time)"
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);
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@ -199,20 +232,155 @@ class PdoSessionHandler implements \SessionHandlerInterface
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$insertStmt->bindParam(':data', $encoded, \PDO::PARAM_STR);
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$insertStmt->bindValue(':time', time(), \PDO::PARAM_INT);
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$insertStmt->execute();
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$this->pdo->commit();
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} catch (\PDOException $e) {
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$this->pdo->rollback();
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throw $e;
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}
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} catch (\PDOException $e) {
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throw new \RuntimeException(sprintf('PDOException was thrown when trying to write the session data: %s', $e->getMessage()), 0, $e);
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$this->rollback();
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throw $e;
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}
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return true;
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}
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/**
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* {@inheritdoc}
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*/
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public function close()
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{
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$this->commit();
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if ($this->gcCalled) {
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$maxlifetime = (int) ini_get('session.gc_maxlifetime');
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// delete the session records that have expired
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$sql = "DELETE FROM $this->table WHERE $this->timeCol <= :time";
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$stmt = $this->pdo->prepare($sql);
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$stmt->bindValue(':time', time() - $maxlifetime, \PDO::PARAM_INT);
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$stmt->execute();
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}
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return true;
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}
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/**
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* Helper method to begin a transaction.
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*
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* Since SQLite does not support row level locks, we have to acquire a reserved lock
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* on the database immediately. Because of https://bugs.php.net/42766 we have to create
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* such a transaction manually which also means we cannot use PDO::commit or
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* PDO::rollback or PDO::inTransaction for SQLite.
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*/
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private function beginTransaction()
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{
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if ($this->inTransaction) {
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$this->rollback();
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throw new \BadMethodCallException(
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'Session handler methods have been invoked in wrong sequence. ' .
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'Expected sequence: open() -> read() -> destroy() / write() -> close()');
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}
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if ('sqlite' === $this->driver) {
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$this->pdo->exec('BEGIN IMMEDIATE TRANSACTION');
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} else {
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$this->pdo->beginTransaction();
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}
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$this->inTransaction = true;
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}
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/**
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* Helper method to commit a transaction.
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*/
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private function commit()
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{
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if ($this->inTransaction) {
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try {
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// commit read-write transaction which also releases the lock
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if ('sqlite' === $this->driver) {
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$this->pdo->exec('COMMIT');
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} else {
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$this->pdo->commit();
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}
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$this->inTransaction = false;
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} catch (\PDOException $e) {
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$this->rollback();
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throw $e;
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}
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}
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}
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/**
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* Helper method to rollback a transaction.
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*/
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private function rollback()
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{
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// We only need to rollback if we are in a transaction. Otherwise the resulting
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// error would hide the real problem why rollback was called. We might not be
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// in a transaction when two callbacks (e.g. destroy and write) are invoked that
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// both fail.
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if ($this->inTransaction) {
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if ('sqlite' === $this->driver) {
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$this->pdo->exec('ROLLBACK');
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} else {
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$this->pdo->rollback();
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}
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$this->inTransaction = false;
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}
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}
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/**
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* Exclusively locks the row so other concurrent requests on the same session will block.
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*
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* This prevents loss of data by keeping the data consistent between read() and write().
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* We do not use SELECT FOR UPDATE because it does not lock non-existent rows. And a following
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* INSERT when not found can result in a deadlock for one connection.
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*
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* @param string $sessionId Session ID
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*/
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private function lockSession($sessionId)
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{
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switch ($this->driver) {
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case 'mysql':
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// will also lock the row when actually nothing got updated (id = id)
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$sql = "INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) " .
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"ON DUPLICATE KEY UPDATE $this->idCol = $this->idCol";
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break;
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case 'oci':
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// DUAL is Oracle specific dummy table
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$sql = "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->idCol = $this->idCol";
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break;
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case 'sqlsrv':
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// MS SQL Server requires MERGE be terminated by semicolon
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$sql = "MERGE INTO $this->table USING (SELECT 'x' AS dummy) AS src ON ($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->idCol = $this->idCol;";
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break;
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case 'pgsql':
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// obtain an exclusive transaction level advisory lock
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$sql = 'SELECT pg_advisory_xact_lock(:lock_id)';
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$stmt = $this->pdo->prepare($sql);
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$stmt->bindValue(':lock_id', hexdec(substr($sessionId, 0, 15)), \PDO::PARAM_INT);
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$stmt->execute();
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return;
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default:
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return;
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}
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// We create a DML lock for the session by inserting empty data or updating the row.
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// This is safer than an application level advisory lock because it also prevents concurrent modification
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// of the session from other parts of the application.
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$stmt = $this->pdo->prepare($sql);
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$stmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$stmt->bindValue(':data', '', \PDO::PARAM_STR);
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$stmt->bindValue(':time', time(), \PDO::PARAM_INT);
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$stmt->execute();
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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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@ -220,9 +388,7 @@ class PdoSessionHandler implements \SessionHandlerInterface
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*/
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private function getMergeSql()
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{
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$driver = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME);
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switch ($driver) {
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switch ($this->driver) {
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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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@ -230,12 +396,12 @@ class PdoSessionHandler implements \SessionHandlerInterface
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// DUAL is Oracle specific dummy table
|
||||
return "MERGE INTO $this->table USING DUAL ON ($this->idCol = :id) " .
|
||||
"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) " .
|
||||
"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data";
|
||||
"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data, $this->timeCol = :time";
|
||||
case 'sqlsrv':
|
||||
// MS SQL Server requires MERGE be terminated by semicolon
|
||||
return "MERGE INTO $this->table USING (SELECT 'x' AS dummy) AS src ON ($this->idCol = :id) " .
|
||||
"WHEN NOT MATCHED THEN INSERT ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time) " .
|
||||
"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data;";
|
||||
"WHEN MATCHED THEN UPDATE SET $this->dataCol = :data, $this->timeCol = :time;";
|
||||
case 'sqlite':
|
||||
return "INSERT OR REPLACE INTO $this->table ($this->idCol, $this->dataCol, $this->timeCol) VALUES (:id, :data, :time)";
|
||||
}
|
||||
|
@ -29,74 +29,108 @@ class PdoSessionHandlerTest extends \PHPUnit_Framework_TestCase
|
||||
$this->pdo->exec($sql);
|
||||
}
|
||||
|
||||
public function testIncompleteOptions()
|
||||
{
|
||||
$this->setExpectedException('InvalidArgumentException');
|
||||
$storage = new PdoSessionHandler($this->pdo, array());
|
||||
}
|
||||
|
||||
/**
|
||||
* @expectedException \InvalidArgumentException
|
||||
*/
|
||||
public function testWrongPdoErrMode()
|
||||
{
|
||||
$pdo = new \PDO("sqlite::memory:");
|
||||
$pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_SILENT);
|
||||
$pdo->exec("CREATE TABLE sessions (sess_id VARCHAR(255) PRIMARY KEY, sess_data TEXT, sess_time INTEGER)");
|
||||
$this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_SILENT);
|
||||
|
||||
$this->setExpectedException('InvalidArgumentException');
|
||||
$storage = new PdoSessionHandler($pdo, array('db_table' => 'sessions'));
|
||||
$storage = new PdoSessionHandler($this->pdo);
|
||||
}
|
||||
|
||||
public function testWrongTableOptionsWrite()
|
||||
/**
|
||||
* @expectedException \RuntimeException
|
||||
*/
|
||||
public function testInexistentTable()
|
||||
{
|
||||
$storage = new PdoSessionHandler($this->pdo, array('db_table' => 'bad_name'));
|
||||
$this->setExpectedException('RuntimeException');
|
||||
$storage->write('foo', 'bar');
|
||||
$storage = new PdoSessionHandler($this->pdo, array('db_table' => 'inexistent_table'));
|
||||
$storage->open('', 'sid');
|
||||
$storage->read('id');
|
||||
$storage->write('id', 'data');
|
||||
$storage->close();
|
||||
}
|
||||
|
||||
public function testWrongTableOptionsRead()
|
||||
public function testReadWriteRead()
|
||||
{
|
||||
$storage = new PdoSessionHandler($this->pdo, array('db_table' => 'bad_name'));
|
||||
$this->setExpectedException('RuntimeException');
|
||||
$storage->read('foo', 'bar');
|
||||
$storage = new PdoSessionHandler($this->pdo);
|
||||
$storage->open('', 'sid');
|
||||
$this->assertSame('', $storage->read('id'), 'New session returns empty string data');
|
||||
$storage->write('id', 'data');
|
||||
$storage->close();
|
||||
|
||||
$storage->open('', 'sid');
|
||||
$this->assertSame('data', $storage->read('id'), 'Written value can be read back correctly');
|
||||
$storage->close();
|
||||
}
|
||||
|
||||
public function testWriteRead()
|
||||
/**
|
||||
* Simulates session_regenerate_id(true) which will require an INSERT or UPDATE (replace)
|
||||
*/
|
||||
public function testWriteDifferentSessionIdThanRead()
|
||||
{
|
||||
$storage = new PdoSessionHandler($this->pdo, array('db_table' => 'sessions'));
|
||||
$storage->write('foo', 'bar');
|
||||
$this->assertEquals('bar', $storage->read('foo'), 'written value can be read back correctly');
|
||||
$storage = new PdoSessionHandler($this->pdo);
|
||||
$storage->open('', 'sid');
|
||||
$storage->read('id');
|
||||
$storage->destroy('id');
|
||||
$storage->write('new_id', 'data_of_new_session_id');
|
||||
$storage->close();
|
||||
|
||||
$storage->open('', 'sid');
|
||||
$this->assertSame('data_of_new_session_id', $storage->read('new_id'), 'Data of regenerated session id is available');
|
||||
$storage->close();
|
||||
}
|
||||
|
||||
public function testMultipleInstances()
|
||||
/**
|
||||
* @expectedException \BadMethodCallException
|
||||
*/
|
||||
public function testWrongUsage()
|
||||
{
|
||||
$storage1 = new PdoSessionHandler($this->pdo, array('db_table' => 'sessions'));
|
||||
$storage1->write('foo', 'bar');
|
||||
|
||||
$storage2 = new PdoSessionHandler($this->pdo, array('db_table' => 'sessions'));
|
||||
$this->assertEquals('bar', $storage2->read('foo'), 'values persist between instances');
|
||||
$storage = new PdoSessionHandler($this->pdo);
|
||||
$storage->open('', 'sid');
|
||||
$storage->read('id');
|
||||
$storage->read('id');
|
||||
}
|
||||
|
||||
public function testSessionDestroy()
|
||||
{
|
||||
$storage = new PdoSessionHandler($this->pdo, array('db_table' => 'sessions'));
|
||||
$storage->write('foo', 'bar');
|
||||
$this->assertCount(1, $this->pdo->query('SELECT * FROM sessions')->fetchAll());
|
||||
$storage = new PdoSessionHandler($this->pdo);
|
||||
|
||||
$storage->destroy('foo');
|
||||
$storage->open('', 'sid');
|
||||
$storage->read('id');
|
||||
$storage->write('id', 'data');
|
||||
$storage->close();
|
||||
$this->assertEquals(1, $this->pdo->query('SELECT COUNT(*) FROM sessions')->fetchColumn());
|
||||
|
||||
$this->assertCount(0, $this->pdo->query('SELECT * FROM sessions')->fetchAll());
|
||||
$storage->open('', 'sid');
|
||||
$storage->read('id');
|
||||
$storage->destroy('id');
|
||||
$storage->close();
|
||||
$this->assertEquals(0, $this->pdo->query('SELECT COUNT(*) FROM sessions')->fetchColumn());
|
||||
|
||||
$storage->open('', 'sid');
|
||||
$this->assertSame('', $storage->read('id'), 'Destroyed session returns empty string');
|
||||
$storage->close();
|
||||
}
|
||||
|
||||
public function testSessionGC()
|
||||
{
|
||||
$storage = new PdoSessionHandler($this->pdo, array('db_table' => 'sessions'));
|
||||
$previousLifeTime = ini_set('session.gc_maxlifetime', 0);
|
||||
$storage = new PdoSessionHandler($this->pdo);
|
||||
|
||||
$storage->write('foo', 'bar');
|
||||
$storage->write('baz', 'bar');
|
||||
$storage->open('', 'sid');
|
||||
$storage->read('id');
|
||||
$storage->write('id', 'data');
|
||||
$storage->close();
|
||||
$this->assertEquals(1, $this->pdo->query('SELECT COUNT(*) FROM sessions')->fetchColumn());
|
||||
|
||||
$this->assertCount(2, $this->pdo->query('SELECT * FROM sessions')->fetchAll());
|
||||
$storage->open('', 'sid');
|
||||
$this->assertSame('', $storage->read('id'), 'Session already considered garbage, so not returning data even if it is not pruned yet');
|
||||
$storage->gc(0);
|
||||
$storage->close();
|
||||
$this->assertEquals(0, $this->pdo->query('SELECT COUNT(*) FROM sessions')->fetchColumn());
|
||||
|
||||
$storage->gc(-1);
|
||||
$this->assertCount(0, $this->pdo->query('SELECT * FROM sessions')->fetchAll());
|
||||
ini_set('session.gc_maxlifetime', $previousLifeTime);
|
||||
}
|
||||
|
||||
public function testGetConnection()
|
||||
|
Reference in New Issue
Block a user