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<?php
namespace Drupal\Core\Batch;
use Drupal\Core\Database\Connection;
use Drupal\Core\Database\SchemaObjectExistsException;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Drupal\Core\Access\CsrfTokenGenerator;
class BatchStorage implements BatchStorageInterface {
/**
* The table name.
*/
const TABLE_NAME = 'batch';
/**
* The database connection.
*
* @var \Drupal\Core\Database\Connection
*/
protected $connection;
/**
* The session.
*
* @var \Symfony\Component\HttpFoundation\Session\SessionInterface
*/
protected $session;
/**
* The CSRF token generator.
*
* @var \Drupal\Core\Access\CsrfTokenGenerator
*/
protected $csrfToken;
/**
* Constructs the database batch storage service.
*
* @param \Drupal\Core\Database\Connection $connection
* The database connection.
* @param \Symfony\Component\HttpFoundation\Session\SessionInterface $session
* The session.
* @param \Drupal\Core\Access\CsrfTokenGenerator $csrf_token
* The CSRF token generator.
*/
public function __construct(Connection $connection, SessionInterface $session, CsrfTokenGenerator $csrf_token) {
$this->connection = $connection;
$this->session = $session;
$this->csrfToken = $csrf_token;
}
/**
* {@inheritdoc}
*/
public function load($id) {
// Ensure that a session is started before using the CSRF token generator.
$this->session->start();
try {
$batch = $this->connection->query("SELECT batch FROM {batch} WHERE bid = :bid AND token = :token", [
':bid' => $id,
':token' => $this->csrfToken->get($id),
])->fetchField();
}
catch (\Exception $e) {
$this->catchException($e);
$batch = FALSE;
}
if ($batch) {
return unserialize($batch);
}
return FALSE;
}
/**
* {@inheritdoc}
*/
public function delete($id) {
try {
$this->connection->delete('batch')
->condition('bid', $id)
->execute();
}
catch (\Exception $e) {
$this->catchException($e);
}
}
/**
* {@inheritdoc}
*/
public function update(array $batch) {
try {
$this->connection->update('batch')
->fields(['batch' => serialize($batch)])
->condition('bid', $batch['id'])
->execute();
}
catch (\Exception $e) {
$this->catchException($e);
}
}
/**
* {@inheritdoc}
*/
public function cleanup() {
try {
// Cleanup the batch table and the queue for failed batches.
$this->connection->delete('batch')
->condition('timestamp', REQUEST_TIME - 864000, '<')
->execute();
}
catch (\Exception $e) {
$this->catchException($e);
}
}
/**
* {@inheritdoc}
*/
public function create(array $batch) {
// Ensure that a session is started before using the CSRF token generator.
$this->session->start();
$try_again = FALSE;
try {
// The batch table might not yet exist.
$this->doCreate($batch);
}
catch (\Exception $e) {
// If there was an exception, try to create the table.
if (!$try_again = $this->ensureTableExists()) {
// If the exception happened for other reason than the missing table,
// propagate the exception.
throw $e;
}
}
// Now that the table has been created, try again if necessary.
if ($try_again) {
$this->doCreate($batch);
}
}
/**
* Saves a batch.
*
* @param array $batch
* The array representing the batch to create.
*/
protected function doCreate(array $batch) {
$this->connection->insert('batch')
->fields([
'bid' => $batch['id'],
'timestamp' => REQUEST_TIME,
'token' => $this->csrfToken->get($batch['id']),
'batch' => serialize($batch),
])
->execute();
}
/**
* Check if the table exists and create it if not.
*/
protected function ensureTableExists() {
try {
$database_schema = $this->connection->schema();
if (!$database_schema->tableExists(static::TABLE_NAME)) {
$schema_definition = $this->schemaDefinition();
$database_schema->createTable(static::TABLE_NAME, $schema_definition);
return TRUE;
}
}
// If another process has already created the batch table, attempting to
// recreate it will throw an exception. In this case just catch the
// exception and do nothing.
catch (SchemaObjectExistsException $e) {
return TRUE;
}
return FALSE;
}
/**
* Act on an exception when batch might be stale.
*
* If the table does not yet exist, that's fine, but if the table exists and
* yet the query failed, then the batch is stale and the exception needs to
* propagate.
*
* @param $e
* The exception.
*
* @throws \Exception
*/
protected function catchException(\Exception $e) {
if ($this->connection->schema()->tableExists(static::TABLE_NAME)) {
throw $e;
}
}
/**
* Defines the schema for the batch table.
*/
public function schemaDefinition() {
return [
'description' => 'Stores details about batches (processes that run in multiple HTTP requests).',
'fields' => [
'bid' => [
'description' => 'Primary Key: Unique batch ID.',
// This is not a serial column, to allow both progressive and
// non-progressive batches. See batch_process().
'type' => 'int',
'unsigned' => TRUE,
'not null' => TRUE,
],
'token' => [
'description' => "A string token generated against the current user's session id and the batch id, used to ensure that only the user who submitted the batch can effectively access it.",
'type' => 'varchar_ascii',
'length' => 64,
'not null' => TRUE,
],
'timestamp' => [
'description' => 'A Unix timestamp indicating when this batch was submitted for processing. Stale batches are purged at cron time.',
'type' => 'int',
'not null' => TRUE,
],
'batch' => [
'description' => 'A serialized array containing the processing data for the batch.',
'type' => 'blob',
'not null' => FALSE,
'size' => 'big',
],
],
'primary key' => ['bid'],
'indexes' => [
'token' => ['token'],
],
];
}
}