Issue #2458817 by Berdir, dawehner: Creating new user entities for anonymous users is very slow

core/modules/comment/comment.module

@@ -631,31 +631,6 @@ function comment_preprocess_block(&$variables) {
   }
 }
 
-/**
- * Prepares a user account object for rendering comment authors.
- *
- * This helper handles anonymous authors in addition to registered comment
- * authors.
- *
- * @param \Drupal\comment\CommentInterface $comment
- *   The comment to which the author replied.
- *
- * @return \Drupal\user\UserInterface
- *   A user account, for use with theme_username() or the user_picture template.
- */
-function comment_prepare_author(CommentInterface $comment) {
-  // The account has been pre-loaded by CommentViewBuilder::buildComponents().
-  $account = $comment->getOwner();
-  if (empty($account->uid->value)) {
-    // @todo Avoid creating a new entity by just creating a new instance
-    //   directly, see https://drupal.org/node/1867228.
-    $account = entity_create('user', array('uid' => 0, 'name' => $comment->getAuthorName(), 'homepage' => $comment->getHomepage()));
-    // The anonymous user is not a new account, do not treat it as one.
-    $account->enforceIsNew(FALSE);
-  }
-  return $account;
-}
-
 /**
  * Prepares variables for comment templates.
  *
@@ -673,7 +648,7 @@ function template_preprocess_comment(&$variables) {
   $variables['comment'] = $comment;
   $variables['commented_entity'] = $commented_entity;
 
-  $account = comment_prepare_author($comment);
+  $account = $comment->getOwner();
   $username = array(
     '#theme' => 'username',
     '#account' => $account,
@@ -718,7 +693,7 @@ function template_preprocess_comment(&$variables) {
   if ($comment->hasParentComment()) {
     // Fetch and store the parent comment information for use in templates.
     $comment_parent = $comment->getParentComment();
-    $account_parent = comment_prepare_author($comment_parent);
+    $account_parent = $comment_parent->getOwner();
     $variables['parent_comment'] = $comment_parent;
     $username = array(
       '#theme' => 'username',

core/modules/comment/src/Entity/Comment.php

@@ -14,6 +14,7 @@ use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Field\BaseFieldDefinition;
 use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\user\Entity\User;
 use Drupal\user\UserInterface;
 
 /**
@@ -534,7 +535,13 @@ class Comment extends ContentEntityBase implements CommentInterface {
    * {@inheritdoc}
    */
   public function getOwner() {
-    return $this->get('uid')->entity;
+    $user = $this->get('uid')->entity;
+    if (!$user || $user->isAnonymous()) {
+      $user = User::getAnonymousUser();
+      $user->name = $this->getAuthorName();
+      $user->homepage = $this->getHomepage();
+    }
+    return $user;
   }
 
   /**

core/modules/comment/src/Form/CommentAdminOverview.php

@@ -185,7 +185,7 @@ class CommentAdminOverview extends FormBase {
       $commented_entity = $commented_entities[$comment->getCommentedEntityTypeId()][$comment->getCommentedEntityId()];
       $username = array(
         '#theme' => 'username',
-        '#account' => comment_prepare_author($comment),
+        '#account' => $comment->getOwner(),
       );
       $body = '';
       if (!empty($comment->comment_body->value)) {

core/modules/node/src/NodeViewBuilder.php

@@ -11,6 +11,7 @@ use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityViewBuilder;
 use Drupal\node\Entity\Node;
+use Drupal\user\Entity\User;
 
 /**
  * Render controller for nodes.
@@ -26,9 +27,6 @@ class NodeViewBuilder extends EntityViewBuilder {
       return;
     }
 
-    // Attach user account.
-    user_attach_accounts($build, $entities);
-
     parent::buildComponents($build, $entities, $displays, $view_mode, $langcode);
 
     foreach ($entities as $id => $entity) {

core/modules/user/src/Entity/User.php

@@ -62,6 +62,13 @@ use Drupal\user\UserInterface;
  */
 class User extends ContentEntityBase implements UserInterface {
 
+  /**
+   * Stores a reference for a reusable anonymous user entity.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected static $anonymousUser;
+
   /**
    * The hostname for this user.
    *
@@ -424,6 +431,26 @@ class User extends ContentEntityBase implements UserInterface {
     return !empty($this->get('pass')->existing) && \Drupal::service('password')->check(trim($this->get('pass')->existing), $account_unchanged);
   }
 
+  /**
+   * Returns an anonymous user entity.
+   *
+   * @return \Drupal\user\UserInterface
+   *   An anonymous user entity.
+   */
+  public static function getAnonymousUser() {
+    if (!isset(static::$anonymousUser)) {
+
+      // @todo Use the entity factory once available, see
+      //   https://www.drupal.org/node/1867228.
+      $entity_manager = \Drupal::entityManager();
+      $entity_type = $entity_manager->getDefinition('user');
+      $class = $entity_type->getClass();
+
+      static::$anonymousUser = new $class(['uid' => [LanguageInterface::LANGCODE_DEFAULT => 0]], $entity_type->id());
+    }
+    return clone static::$anonymousUser;
+  }
+
   /**
    * {@inheritdoc}
    */

core/modules/user/src/Plugin/Field/FieldFormatter/AuthorFormatter.php

@@ -9,7 +9,7 @@ namespace Drupal\user\Plugin\Field\FieldFormatter;
 
 use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\FieldItemListInterface;
-use Drupal\Core\Field\FormatterBase;
+use Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceFormatterBase;
 
 /**
  * Plugin implementation of the 'author' formatter.
@@ -23,7 +23,7 @@ use Drupal\Core\Field\FormatterBase;
  *   }
  * )
  */
-class AuthorFormatter extends FormatterBase {
+class AuthorFormatter extends EntityReferenceFormatterBase {
 
   /**
    * {@inheritdoc}

core/modules/user/user.module

@@ -116,36 +116,6 @@ function user_js_settings_alter(&$settings, AttachedAssetsInterface $assets) {
   $settings['user']['permissionsHash'] = \Drupal::service('user_permissions_hash_generator')->generate($user);
 }
 
-/**
- * Populates $entity->account for each prepared entity.
- *
- * Called by Drupal\Core\Entity\EntityViewBuilderInterface::buildComponents()
- * implementations.
- *
- * @param array &$build
- *   A renderable array representing the entity content.
- * @param \Drupal\user\EntityOwnerInterface[] $entities
- *   The entities keyed by entity ID.
- */
-function user_attach_accounts(array &$build, array $entities) {
-  $uids = array();
-  foreach ($entities as $entity) {
-    $uids[] = $entity->getOwnerId();
-  }
-  $uids = array_unique($uids);
-  $accounts = user_load_multiple($uids);
-  $anonymous = entity_create('user', array('uid' => 0));
-
-  foreach ($entities as $id => $entity) {
-    if (isset($accounts[$entity->getOwnerId()])) {
-      $entities[$id]->setOwner($accounts[$entity->getOwnerId()]);
-    }
-    else {
-      $entities[$id]->setOwner($anonymous);
-    }
-  }
-}
-
 /**
  * Returns whether this site supports the default user picture feature.
  *