LoggerEntry.php

<?php

/**
 * @file
 * Contains \Drupal\rules\Plugin\DataType\LoggerEntry.
 */

namespace Drupal\rules\Plugin\DataType;

use Drupal\Core\TypedData\Plugin\DataType\Map;

/**
 * The logger entry data type.
 *
 * @see: https://www.drupal.org/node/2625238
 *
 * @ingroup typed_data
 *
 * @DataType(
 *   id = "loggerentry",
 *   label = @Translation("Logger Entry"),
 *   definition_class = "\Drupal\Core\TypedData\MapDataDefinition"
 * )
 */
class LoggerEntry extends Map {

  /**
   * The data definition.
   *
   * @var \Drupal\Core\TypedData\ComplexDataDefinitionInterface
   */
  protected $definition;

  /**
   * An array of values for the contained properties.
   *
   * @var array
   */
  protected $values = array();

  /**
   * The array of properties.
   *
   * @var \Drupal\Core\TypedData\TypedDataInterface[]
   */
  protected $properties = array();

  public function __construct(DataDefinitionInterface $definition, $name, TypedDataInterface $parent, $logger_entry_context) {
    parent::__construct($definition, $name, $parent);

    $this->values = $this->createLoggerEntryFromContext($logger_entry_context)
  }

  // Plain copy from \Drupal\rules\Logger\RulesLog
  protected function createLoggerEntryFromContext($context) {
    // Remove any backtraces since they may contain an unserializable variable.
    unset($context['backtrace']);

    // Convert PSR3-style messages to SafeMarkup::format() style, so they can be
    // translated too in runtime.
    $message_placeholders = $this->parser->parseMessagePlaceholders($message, $context);

    $logger_entry = array(
      'uid' => $context['uid'],
      'type' => $context['channel'],
      'message' => $message,
      'variables' => $message_placeholders,
      'severity' => $level,
      'link' => $context['link'],
      'location' => $context['request_uri'],
      'referer' => $context['referer'],
      'hostname' => $context['ip'],
      'timestamp' => $context['timestamp'],
    );

    return $logger_entry;
  }
}