class MigrateExecutable in Drupal 8

Same name and namespace in other branches

9 core/modules/migrate/src/MigrateExecutable.php \Drupal\migrate\MigrateExecutable

Defines a migrate executable class.

Hierarchy

class \Drupal\migrate\MigrateExecutable implements MigrateExecutableInterface uses StringTranslationTrait

Expanded class hierarchy of MigrateExecutable

35 files declare their use of MigrateExecutable

DownloadFunctionalTest.php in core/modules/migrate/tests/src/Functional/process/DownloadFunctionalTest.php
EntityContentBaseTest.php in core/modules/migrate_drupal/tests/src/Kernel/d6/EntityContentBaseTest.php
ExecuteMigration.php in core/modules/migrate/tests/modules/migrate_no_migrate_drupal_test/src/Controller/ExecuteMigration.php
ExtractTest.php in core/modules/migrate/tests/src/Kernel/process/ExtractTest.php
FileUriTest.php in core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php

... See full list

File

core/modules/migrate/src/MigrateExecutable.php, line 22

Namespace

Drupal\migrate

View source

class MigrateExecutable implements MigrateExecutableInterface {
  use StringTranslationTrait;

  /**
   * The configuration of the migration to do.
   *
   * @var \Drupal\migrate\Plugin\MigrationInterface
   */
  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 = [];

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

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

  /**
   * Migration message service.
   *
   * @todo https://www.drupal.org/node/2822663 Make this protected.
   *
   * @var \Drupal\migrate\MigrateMessageInterface
   */
  public $message;

  /**
   * Constructs a MigrateExecutable and verifies and sets the memory limit.
   *
   * @param \Drupal\migrate\Plugin\MigrationInterface $migration
   *   The migration to run.
   * @param \Drupal\migrate\MigrateMessageInterface $message
   *   (optional) The migrate message service.
   * @param \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher
   *   (optional) The event dispatcher.
   *
   * @throws \Drupal\migrate\MigrateException
   */
  public function __construct(MigrationInterface $migration, MigrateMessageInterface $message = NULL, EventDispatcherInterface $event_dispatcher = NULL) {
    $this->migration = $migration;
    $this->message = $message ?: new MigrateMessage();
    $this
      ->getIdMap()
      ->setMessage($this->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 {
      $this->memoryLimit = Bytes::toInt($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', [
        '@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, $this->message));

    // 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', [
        '@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
      ->getIdMap();
    try {
      $source
        ->rewind();
    } catch (\Exception $e) {
      $this->message
        ->display($this
        ->t('Migration failed with source plugin exception: @e in @file line @line', [
        '@e' => $e
          ->getMessage(),
        '@file' => $e
          ->getFile(),
        '@line' => $e
          ->getLine(),
      ]), '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) {
        $this
          ->getIdMap()
          ->saveIdMapping($row, [], $e
          ->getStatus());
        $this
          ->saveMessage($e
          ->getMessage(), $e
          ->getLevel());
        $save = FALSE;
      } catch (MigrateSkipRowException $e) {
        if ($e
          ->getSaveToMap()) {
          $id_map
            ->saveIdMapping($row, [], MigrateIdMapInterface::STATUS_IGNORED);
        }
        if ($message = trim($e
          ->getMessage())) {
          $this
            ->saveMessage($message, MigrationInterface::MESSAGE_INFORMATIONAL);
        }
        $save = FALSE;
      }
      if ($save) {
        try {
          $this
            ->getEventDispatcher()
            ->dispatch(MigrateEvents::PRE_ROW_SAVE, new MigratePreRowSaveEvent($this->migration, $this->message, $row));
          $destination_ids = $id_map
            ->lookupDestinationIds($this->sourceIdValues);
          $destination_id_values = $destination_ids ? reset($destination_ids) : [];
          $destination_id_values = $destination
            ->import($row, $destination_id_values);
          $this
            ->getEventDispatcher()
            ->dispatch(MigrateEvents::POST_ROW_SAVE, new MigratePostRowSaveEvent($this->migration, $this->message, $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, [], 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) {
          $this
            ->getIdMap()
            ->saveIdMapping($row, [], $e
            ->getStatus());
          $this
            ->saveMessage($e
            ->getMessage(), $e
            ->getLevel());
        } catch (\Exception $e) {
          $this
            ->getIdMap()
            ->saveIdMapping($row, [], MigrateIdMapInterface::STATUS_FAILED);
          $this
            ->handleException($e);
        }
      }
      $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 in @file line @line', [
          '@e' => $e
            ->getMessage(),
          '@file' => $e
            ->getFile(),
          '@line' => $e
            ->getLine(),
        ]), 'error');
        $this->migration
          ->setStatus(MigrationInterface::STATUS_IDLE);
        return MigrationInterface::RESULT_FAILED;
      }
    }
    $this
      ->getEventDispatcher()
      ->dispatch(MigrateEvents::POST_IMPORT, new MigrateImportEvent($this->migration, $this->message));
    $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
      ->getIdMap();
    $destination = $this->migration
      ->getDestinationPlugin();

    // Loop through each row in the map, and try to roll it back.
    $id_map
      ->rewind();
    while ($id_map
      ->valid()) {
      $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);
      }
      else {

        // If there is no destination key the import probably failed and we can
        // remove the row without further action.
        $source_key = $id_map
          ->currentSource();
        $id_map
          ->delete($source_key);
      }
      $id_map
        ->next();

      // 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;
      }
    }

    // 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;
  }

  /**
   * Get the ID map from the current migration.
   *
   * @return \Drupal\migrate\Plugin\MigrateIdMapInterface
   *   The ID map.
   */
  protected function getIdMap() {
    return $this->migration
      ->getIdMap();
  }

  /**
   * {@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']) {
          $new_value = [];
          if (!is_array($value)) {
            throw new MigrateException(sprintf('Pipeline failed at %s plugin for destination %s: %s received instead of an array,', $plugin
              ->getPluginId(), $destination, $value));
          }
          $break = FALSE;
          foreach ($value as $scalar_value) {
            try {
              $new_value[] = $plugin
                ->transform($scalar_value, $this, $row, $destination);
            } catch (MigrateSkipProcessException $e) {
              $new_value[] = NULL;
              $break = TRUE;
            }
          }
          $value = $new_value;
          if ($break) {
            break;
          }
        }
        else {
          try {
            $value = $plugin
              ->transform($value, $this, $row, $destination);
          } catch (MigrateSkipProcessException $e) {
            $value = NULL;
            break;
          }
          $multiple = $plugin
            ->multiple();
        }
      }

      // Ensure all values, including nulls, are migrated.
      if ($plugins) {
        if (isset($value)) {
          $row
            ->setDestinationProperty($destination, $value);
        }
        else {
          $row
            ->setEmptyDestinationProperty($destination);
        }
      }

      // 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) {
    $this
      ->getIdMap()
      ->saveMessage($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.', [
        '@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', [
          '@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', [
          '@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.
    $entity_type_manager = \Drupal::entityTypeManager();
    foreach ($entity_type_manager
      ->getDefinitions() as $id => $definition) {
      $entity_type_manager
        ->getStorage($id)
        ->resetCache();
    }

    // @TODO: explore resetting the container.
    // Run garbage collector to further reduce memory.
    gc_collect_cycles();
    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::$counts	protected	property	An array of counts. Initially used for cache hit/miss tracking.
MigrateExecutable::$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::$message	public	property	Migration message service.
MigrateExecutable::$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::$sourceRowStatus	protected	property	Status of one row.
MigrateExecutable::attemptMemoryReclaim	protected	function	Tries to reclaim memory.	1
MigrateExecutable::checkStatus	protected	function	Checks for exceptional conditions, and display feedback.
MigrateExecutable::currentSourceIds	protected	function	Fetches the key array for the current source record.
MigrateExecutable::formatSize	protected	function	Generates a string representation for the given byte count.	1
MigrateExecutable::getEventDispatcher	protected	function	Gets the event dispatcher.
MigrateExecutable::getIdMap	protected	function	Get the ID map from the current migration.	1
MigrateExecutable::getMemoryUsage	protected	function	Returns the memory usage so far.	1
MigrateExecutable::getSource	protected	function	Returns the source.	1
MigrateExecutable::handleException	protected	function	Takes an Exception object and both saves and displays it.	1
MigrateExecutable::import	public	function	Performs an import operation - migrate items from source to destination. Overrides MigrateExecutableInterface::import
MigrateExecutable::memoryExceeded	protected	function	Tests whether we've exceeded the desired memory threshold.	1
MigrateExecutable::processRow	public	function	Processes a row. Overrides MigrateExecutableInterface::processRow
MigrateExecutable::rollback	public	function	Performs a rollback operation - remove previously-imported items. Overrides MigrateExecutableInterface::rollback
MigrateExecutable::saveMessage	public	function	Passes messages through to the map class. Overrides MigrateExecutableInterface::saveMessage
MigrateExecutable::__construct	public	function	Constructs a MigrateExecutable and verifies and sets the memory limit.
StringTranslationTrait::$stringTranslation	protected	property	The string translation service.	1
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.

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class MigrateExecutable in Drupal 8

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