class MigrateExecutable in Zircon Profile 8

Defines a migrate executable class.

Hierarchy

• class \Drupal\migrate\MigrateExecutable implements MigrateExecutableInterface uses StringTranslationTrait

15 files declare their use of MigrateExecutable

FileUriTest.php in core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php

Contains \Drupal\Tests\file\Unit\Plugin\migrate\process\d6\FileUriTest.

IteratorTest.php in core/modules/migrate/tests/src/Unit/process/IteratorTest.php

Contains \Drupal\Tests\migrate\Unit\process\IteratorTest.

MigrateDependenciesTest.php in core/modules/migrate_drupal/src/Tests/dependencies/MigrateDependenciesTest.php

Contains \Drupal\migrate_drupal\Tests\dependencies\MigrateDependenciesTest.

MigrateEventsTest.php in core/modules/migrate/src/Tests/MigrateEventsTest.php

Contains \Drupal\migrate\Tests\MigrateEventsTest.

MigrateInterruptionTest.php in core/modules/migrate/src/Tests/MigrateInterruptionTest.php

Contains \Drupal\migrate\Tests\MigrateInterruptionTest.

... See full list

File

core/modules/migrate/src/MigrateExecutable.php, line 26

Contains \Drupal\migrate\MigrateExecutable.

Namespace

Drupal\migrate

class MigrateExecutable implements MigrateExecutableInterface {
  use StringTranslationTrait;

  /**
   * The configuration of the migration to do.
   *
   * @var \Drupal\migrate\Entity\Migration
   */
  protected $migration;

  /**
   * Status of one row.
   *
   * The value is a MigrateIdMapInterface::STATUS_* constant, for example:
   * STATUS_IMPORTED.
   *
   * @var int
   */
  protected $sourceRowStatus;

  /**
   * The ratio of the memory limit at which an operation will be interrupted.
   *
   * @var float
   */
  protected $memoryThreshold = 0.85;

  /**
   * The PHP memory_limit expressed in bytes.
   *
   * @var int
   */
  protected $memoryLimit;

  /**
   * The configuration values of the source.
   *
   * @var array
   */
  protected $sourceIdValues;

  /**
   * An array of counts. Initially used for cache hit/miss tracking.
   *
   * @var array
   */
  protected $counts = array();

  /**
   * The object currently being constructed.
   *
   * @var \stdClass
   */
  protected $destinationValues;

  /**
   * The source.
   *
   * @var \Drupal\migrate\Plugin\MigrateSourceInterface
   */
  protected $source;

  /**
   * The current data row retrieved from the source.
   *
   * @var \stdClass
   */
  protected $sourceValues;

  /**
   * The event dispatcher.
   *
   * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface
   */
  protected $eventDispatcher;

  /**
   * Constructs a MigrateExecutable and verifies and sets the memory limit.
   *
   * @param \Drupal\migrate\Entity\MigrationInterface $migration
   *   The migration to run.
   * @param \Drupal\migrate\MigrateMessageInterface $message
   *   The message to record.
   * @param \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher
   *   The event dispatcher.
   *
   * @throws \Drupal\migrate\MigrateException
   */
  public function __construct(MigrationInterface $migration, MigrateMessageInterface $message, EventDispatcherInterface $event_dispatcher = NULL) {
    $this->migration = $migration;
    $this->message = $message;
    $this->migration
      ->getIdMap()
      ->setMessage($message);
    $this->eventDispatcher = $event_dispatcher;

    // Record the memory limit in bytes
    $limit = trim(ini_get('memory_limit'));
    if ($limit == '-1') {
      $this->memoryLimit = PHP_INT_MAX;
    }
    else {
      if (!is_numeric($limit)) {
        $last = strtolower(substr($limit, -1));
        switch ($last) {
          case 'g':
            $limit *= 1024;
          case 'm':
            $limit *= 1024;
          case 'k':
            $limit *= 1024;
            break;
          default:
            $limit = PHP_INT_MAX;
            $this->message
              ->display($this
              ->t('Invalid PHP memory_limit @limit, setting to unlimited.', array(
              '@limit' => $limit,
            )));
        }
      }
      $this->memoryLimit = $limit;
    }
  }

  /**
   * Returns the source.
   *
   * Makes sure source is initialized based on migration settings.
   *
   * @return \Drupal\migrate\Plugin\MigrateSourceInterface
   *   The source.
   */
  protected function getSource() {
    if (!isset($this->source)) {
      $this->source = $this->migration
        ->getSourcePlugin();
    }
    return $this->source;
  }

  /**
   * Gets the event dispatcher.
   *
   * @return \Symfony\Component\EventDispatcher\EventDispatcherInterface
   */
  protected function getEventDispatcher() {
    if (!$this->eventDispatcher) {
      $this->eventDispatcher = \Drupal::service('event_dispatcher');
    }
    return $this->eventDispatcher;
  }

  /**
   * {@inheritdoc}
   */
  public function import() {

    // Only begin the import operation if the migration is currently idle.
    if ($this->migration
      ->getStatus() !== MigrationInterface::STATUS_IDLE) {
      $this->message
        ->display($this
        ->t('Migration @id is busy with another operation: @status', array(
        '@id' => $this->migration
          ->id(),
        '@status' => $this
          ->t($this->migration
          ->getStatusLabel()),
      )), 'error');
      return MigrationInterface::RESULT_FAILED;
    }
    $this
      ->getEventDispatcher()
      ->dispatch(MigrateEvents::PRE_IMPORT, new MigrateImportEvent($this->migration));

    // Knock off migration if the requirements haven't been met.
    try {
      $this->migration
        ->checkRequirements();
    } catch (RequirementsException $e) {
      $this->message
        ->display($this
        ->t('Migration @id did not meet the requirements. @message @requirements', array(
        '@id' => $this->migration
          ->id(),
        '@message' => $e
          ->getMessage(),
        '@requirements' => $e
          ->getRequirementsString(),
      )), 'error');
      return MigrationInterface::RESULT_FAILED;
    }
    $this->migration
      ->setStatus(MigrationInterface::STATUS_IMPORTING);
    $return = MigrationInterface::RESULT_COMPLETED;
    $source = $this
      ->getSource();
    $id_map = $this->migration
      ->getIdMap();
    try {
      $source
        ->rewind();
    } catch (\Exception $e) {
      $this->message
        ->display($this
        ->t('Migration failed with source plugin exception: @e', array(
        '@e' => $e
          ->getMessage(),
      )), 'error');
      $this->migration
        ->setStatus(MigrationInterface::STATUS_IDLE);
      return MigrationInterface::RESULT_FAILED;
    }
    $destination = $this->migration
      ->getDestinationPlugin();
    while ($source
      ->valid()) {
      $row = $source
        ->current();
      $this->sourceIdValues = $row
        ->getSourceIdValues();
      try {
        $this
          ->processRow($row);
        $save = TRUE;
      } catch (MigrateException $e) {
        $this->migration
          ->getIdMap()
          ->saveIdMapping($row, array(), $e
          ->getStatus());
        $this
          ->saveMessage($e
          ->getMessage(), $e
          ->getLevel());
        $save = FALSE;
      } catch (MigrateSkipRowException $e) {
        $id_map
          ->saveIdMapping($row, array(), MigrateIdMapInterface::STATUS_IGNORED);
        $save = FALSE;
      }
      if ($save) {
        try {
          $this
            ->getEventDispatcher()
            ->dispatch(MigrateEvents::PRE_ROW_SAVE, new MigratePreRowSaveEvent($this->migration, $row));
          $destination_id_values = $destination
            ->import($row, $id_map
            ->lookupDestinationId($this->sourceIdValues));
          $this
            ->getEventDispatcher()
            ->dispatch(MigrateEvents::POST_ROW_SAVE, new MigratePostRowSaveEvent($this->migration, $row, $destination_id_values));
          if ($destination_id_values) {

            // We do not save an idMap entry for config.
            if ($destination_id_values !== TRUE) {
              $id_map
                ->saveIdMapping($row, $destination_id_values, $this->sourceRowStatus, $destination
                ->rollbackAction());
            }
          }
          else {
            $id_map
              ->saveIdMapping($row, array(), MigrateIdMapInterface::STATUS_FAILED);
            if (!$id_map
              ->messageCount()) {
              $message = $this
                ->t('New object was not saved, no error provided');
              $this
                ->saveMessage($message);
              $this->message
                ->display($message);
            }
          }
        } catch (MigrateException $e) {
          $this->migration
            ->getIdMap()
            ->saveIdMapping($row, array(), $e
            ->getStatus());
          $this
            ->saveMessage($e
            ->getMessage(), $e
            ->getLevel());
        } catch (\Exception $e) {
          $this->migration
            ->getIdMap()
            ->saveIdMapping($row, array(), MigrateIdMapInterface::STATUS_FAILED);
          $this
            ->handleException($e);
        }
      }
      if ($high_water_property = $this->migration
        ->get('highWaterProperty')) {
        $this->migration
          ->saveHighWater($row
          ->getSourceProperty($high_water_property['name']));
      }

      // Reset row properties.
      unset($sourceValues, $destinationValues);
      $this->sourceRowStatus = MigrateIdMapInterface::STATUS_IMPORTED;

      // Check for memory exhaustion.
      if (($return = $this
        ->checkStatus()) != MigrationInterface::RESULT_COMPLETED) {
        break;
      }

      // If anyone has requested we stop, return the requested result.
      if ($this->migration
        ->getStatus() == MigrationInterface::STATUS_STOPPING) {
        $return = $this->migration
          ->getInterruptionResult();
        $this->migration
          ->clearInterruptionResult();
        break;
      }
      try {
        $source
          ->next();
      } catch (\Exception $e) {
        $this->message
          ->display($this
          ->t('Migration failed with source plugin exception: @e', array(
          '@e' => $e
            ->getMessage(),
        )), 'error');
        $this->migration
          ->setStatus(MigrationInterface::STATUS_IDLE);
        return MigrationInterface::RESULT_FAILED;
      }
    }
    $this
      ->getEventDispatcher()
      ->dispatch(MigrateEvents::POST_IMPORT, new MigrateImportEvent($this->migration));
    $this->migration
      ->setStatus(MigrationInterface::STATUS_IDLE);
    return $return;
  }

  /**
   * {@inheritdoc}
   */
  public function rollback() {

    // Only begin the rollback operation if the migration is currently idle.
    if ($this->migration
      ->getStatus() !== MigrationInterface::STATUS_IDLE) {
      $this->message
        ->display($this
        ->t('Migration @id is busy with another operation: @status', [
        '@id' => $this->migration
          ->id(),
        '@status' => $this
          ->t($this->migration
          ->getStatusLabel()),
      ]), 'error');
      return MigrationInterface::RESULT_FAILED;
    }

    // Announce that rollback is about to happen.
    $this
      ->getEventDispatcher()
      ->dispatch(MigrateEvents::PRE_ROLLBACK, new MigrateRollbackEvent($this->migration));

    // Optimistically assume things are going to work out; if not, $return will be
    // updated to some other status.
    $return = MigrationInterface::RESULT_COMPLETED;
    $this->migration
      ->setStatus(MigrationInterface::STATUS_ROLLING_BACK);
    $id_map = $this->migration
      ->getIdMap();
    $destination = $this->migration
      ->getDestinationPlugin();

    // Loop through each row in the map, and try to roll it back.
    foreach ($id_map as $map_row) {
      $destination_key = $id_map
        ->currentDestination();
      if ($destination_key) {
        $map_row = $id_map
          ->getRowByDestination($destination_key);
        if ($map_row['rollback_action'] == MigrateIdMapInterface::ROLLBACK_DELETE) {
          $this
            ->getEventDispatcher()
            ->dispatch(MigrateEvents::PRE_ROW_DELETE, new MigrateRowDeleteEvent($this->migration, $destination_key));
          $destination
            ->rollback($destination_key);
          $this
            ->getEventDispatcher()
            ->dispatch(MigrateEvents::POST_ROW_DELETE, new MigrateRowDeleteEvent($this->migration, $destination_key));
        }

        // We're now done with this row, so remove it from the map.
        $id_map
          ->deleteDestination($destination_key);
      }

      // Check for memory exhaustion.
      if (($return = $this
        ->checkStatus()) != MigrationInterface::RESULT_COMPLETED) {
        break;
      }

      // If anyone has requested we stop, return the requested result.
      if ($this->migration
        ->getStatus() == MigrationInterface::STATUS_STOPPING) {
        $return = $this->migration
          ->getInterruptionResult();
        $this->migration
          ->clearInterruptionResult();
        break;
      }
    }

    // If rollback completed successfully, reset the high water mark.
    if ($return == MigrationInterface::RESULT_COMPLETED) {
      $this->migration
        ->saveHighWater(NULL);
    }

    // Notify modules that rollback attempt was complete.
    $this
      ->getEventDispatcher()
      ->dispatch(MigrateEvents::POST_ROLLBACK, new MigrateRollbackEvent($this->migration));
    $this->migration
      ->setStatus(MigrationInterface::STATUS_IDLE);
    return $return;
  }

  /**
   * {@inheritdoc}
   */
  public function processRow(Row $row, array $process = NULL, $value = NULL) {
    foreach ($this->migration
      ->getProcessPlugins($process) as $destination => $plugins) {
      $multiple = FALSE;

      /** @var $plugin \Drupal\migrate\Plugin\MigrateProcessInterface */
      foreach ($plugins as $plugin) {
        $definition = $plugin
          ->getPluginDefinition();

        // Many plugins expect a scalar value but the current value of the
        // pipeline might be multiple scalars (this is set by the previous
        // plugin) and in this case the current value needs to be iterated
        // and each scalar separately transformed.
        if ($multiple && !$definition['handle_multiples']) {
          $new_value = array();
          if (!is_array($value)) {
            throw new MigrateException(sprintf('Pipeline failed for destination %s: %s got instead of an array,', $destination, $value));
          }
          $break = FALSE;
          foreach ($value as $scalar_value) {
            try {
              $new_value[] = $plugin
                ->transform($scalar_value, $this, $row, $destination);
            } catch (MigrateSkipProcessException $e) {
              $break = TRUE;
            }
          }
          $value = $new_value;
          if ($break) {
            break;
          }
        }
        else {
          try {
            $value = $plugin
              ->transform($value, $this, $row, $destination);
          } catch (MigrateSkipProcessException $e) {
            break;
          }
          $multiple = $multiple || $plugin
            ->multiple();
        }
      }

      // No plugins or no value means do not set.
      if ($plugins && !is_null($value)) {
        $row
          ->setDestinationProperty($destination, $value);
      }

      // Reset the value.
      $value = NULL;
    }
  }

  /**
   * Fetches the key array for the current source record.
   *
   * @return array
   *   The current source IDs.
   */
  protected function currentSourceIds() {
    return $this
      ->getSource()
      ->getCurrentIds();
  }

  /**
   * {@inheritdoc}
   */
  public function saveMessage($message, $level = MigrationInterface::MESSAGE_ERROR) {
    $this->migration
      ->getIdMap()
      ->saveMessage($this->sourceIdValues, $message, $level);
  }

  /**
   * Takes an Exception object and both saves and displays it.
   *
   * Pulls in additional information on the location triggering the exception.
   *
   * @param \Exception $exception
   *   Object representing the exception.
   * @param bool $save
   *   (optional) Whether to save the message in the migration's mapping table.
   *   Set to FALSE in contexts where this doesn't make sense.
   */
  protected function handleException(\Exception $exception, $save = TRUE) {
    $result = Error::decodeException($exception);
    $message = $result['@message'] . ' (' . $result['%file'] . ':' . $result['%line'] . ')';
    if ($save) {
      $this
        ->saveMessage($message);
    }
    $this->message
      ->display($message, 'error');
  }

  /**
   * Checks for exceptional conditions, and display feedback.
   */
  protected function checkStatus() {
    if ($this
      ->memoryExceeded()) {
      return MigrationInterface::RESULT_INCOMPLETE;
    }
    return MigrationInterface::RESULT_COMPLETED;
  }

  /**
   * Tests whether we've exceeded the desired memory threshold.
   *
   * If so, output a message.
   *
   * @return bool
   *   TRUE if the threshold is exceeded, otherwise FALSE.
   */
  protected function memoryExceeded() {
    $usage = $this
      ->getMemoryUsage();
    $pct_memory = $usage / $this->memoryLimit;
    if (!($threshold = $this->memoryThreshold)) {
      return FALSE;
    }
    if ($pct_memory > $threshold) {
      $this->message
        ->display($this
        ->t('Memory usage is @usage (@pct% of limit @limit), reclaiming memory.', array(
        '@pct' => round($pct_memory * 100),
        '@usage' => $this
          ->formatSize($usage),
        '@limit' => $this
          ->formatSize($this->memoryLimit),
      )), 'warning');
      $usage = $this
        ->attemptMemoryReclaim();
      $pct_memory = $usage / $this->memoryLimit;

      // Use a lower threshold - we don't want to be in a situation where we keep
      // coming back here and trimming a tiny amount
      if ($pct_memory > 0.9 * $threshold) {
        $this->message
          ->display($this
          ->t('Memory usage is now @usage (@pct% of limit @limit), not enough reclaimed, starting new batch', array(
          '@pct' => round($pct_memory * 100),
          '@usage' => $this
            ->formatSize($usage),
          '@limit' => $this
            ->formatSize($this->memoryLimit),
        )), 'warning');
        return TRUE;
      }
      else {
        $this->message
          ->display($this
          ->t('Memory usage is now @usage (@pct% of limit @limit), reclaimed enough, continuing', array(
          '@pct' => round($pct_memory * 100),
          '@usage' => $this
            ->formatSize($usage),
          '@limit' => $this
            ->formatSize($this->memoryLimit),
        )), 'warning');
        return FALSE;
      }
    }
    else {
      return FALSE;
    }
  }

  /**
   * Returns the memory usage so far.
   *
   * @return int
   *   The memory usage.
   */
  protected function getMemoryUsage() {
    return memory_get_usage();
  }

  /**
   * Tries to reclaim memory.
   *
   * @return int
   *   The memory usage after reclaim.
   */
  protected function attemptMemoryReclaim() {

    // First, try resetting Drupal's static storage - this frequently releases
    // plenty of memory to continue.
    drupal_static_reset();

    // Entity storage can blow up with caches so clear them out.
    $manager = \Drupal::entityManager();
    foreach ($manager
      ->getDefinitions() as $id => $definition) {
      $manager
        ->getStorage($id)
        ->resetCache();
    }

    // @TODO: explore resetting the container.
    return memory_get_usage();
  }

  /**
   * Generates a string representation for the given byte count.
   *
   * @param int $size
   *   A size in bytes.
   *
   * @return string
   *   A translated string representation of the size.
   */
  protected function formatSize($size) {
    return format_size($size);
  }

}

Members

Name	Modifiers	Type	Description	Overrides
MigrateExecutable::$counts	protected	property	An array of counts. Initially used for cache hit/miss tracking.
MigrateExecutable::$destinationValues	protected	property	The object currently being constructed.
MigrateExecutable::$eventDispatcher	protected	property	The event dispatcher.
MigrateExecutable::$memoryLimit	protected	property	The PHP memory_limit expressed in bytes.
MigrateExecutable::$memoryThreshold	protected	property	The ratio of the memory limit at which an operation will be interrupted.
MigrateExecutable::$migration	protected	property	The configuration of the migration to do.
MigrateExecutable::$source	protected	property	The source.
MigrateExecutable::$sourceIdValues	protected	property	The configuration values of the source.
MigrateExecutable::$sourceRowStatus	protected	property	Status of one row.
MigrateExecutable::$sourceValues	protected	property	The current data row retrieved from the source.
MigrateExecutable::attemptMemoryReclaim	protected	function	Tries to reclaim memory.	1
MigrateExecutable::checkStatus	protected	function	Checks for exceptional conditions, and display feedback.
MigrateExecutable::currentSourceIds	protected	function	Fetches the key array for the current source record.
MigrateExecutable::formatSize	protected	function	Generates a string representation for the given byte count.	1
MigrateExecutable::getEventDispatcher	protected	function	Gets the event dispatcher.
MigrateExecutable::getMemoryUsage	protected	function	Returns the memory usage so far.	1
MigrateExecutable::getSource	protected	function	Returns the source.
MigrateExecutable::handleException	protected	function	Takes an Exception object and both saves and displays it.	1
MigrateExecutable::import	public	function	Performs an import operation - migrate items from source to destination. Overrides MigrateExecutableInterface::import
MigrateExecutable::memoryExceeded	protected	function	Tests whether we've exceeded the desired memory threshold.	1
MigrateExecutable::processRow	public	function	Processes a row. Overrides MigrateExecutableInterface::processRow
MigrateExecutable::rollback	public	function	Performs a rollback operation - remove previously-imported items. Overrides MigrateExecutableInterface::rollback
MigrateExecutable::saveMessage	public	function	Passes messages through to the map class. Overrides MigrateExecutableInterface::saveMessage
MigrateExecutable::__construct	public	function	Constructs a MigrateExecutable and verifies and sets the memory limit.
StringTranslationTrait::$stringTranslation	protected	property	The string translation service.
StringTranslationTrait::formatPlural	protected	function	Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals	protected	function	Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation	protected	function	Gets the string translation service.
StringTranslationTrait::setStringTranslation	public	function	Sets the string translation service to use.	2
StringTranslationTrait::t	protected	function	Translates a string to the current language or to a given language.