Networks and Sites: Lazy load site meta.

In [36566] a framework to lazily load metadata was introduced. This supported term and comment meta by default. In this commit, extends support for site ( blog ) meta. Site meta is not heavily used by core and is used by developers to extend multisite. In this change, `_prime_site_caches` and `WP_Site_Query` now call the new function `wp_lazyload_site_meta`. The function `wp_lazyload_site_meta` accepts an array of ids and adds them to the queue of metadata to be lazily loaded. The function `get_blogs_of_user` was updated to now lazily load site meta. 

Follow on from [55671].

Props spacedmonkey, johnjamesjacoby, peterwilsoncc, mukesh27.
Fixes #58185.
Built from https://develop.svn.wordpress.org/trunk@55747


git-svn-id: http://core.svn.wordpress.org/trunk@55259 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-metadata-lazyloader.php

@@ -61,6 +61,10 @@ class WP_Metadata_Lazyloader {
 				'filter'   => 'get_comment_metadata',
 				'callback' => array( $this, 'lazyload_meta_callback' ),
 			),
+			'blog'    => array(
+				'filter'   => 'get_blog_metadata',
+				'callback' => array( $this, 'lazyload_meta_callback' ),
+			),
 		);
 	}
 

wp-includes/class-wp-site-query.php

@@ -388,6 +388,10 @@ class WP_Site_Query {
 
 		$site_ids = array_map( 'intval', $site_ids );
 
+		if ( $this->query_vars['update_site_meta_cache'] ) {
+			wp_lazyload_site_meta( $site_ids );
+		}
+
 		if ( 'ids' === $this->query_vars['fields'] ) {
 			$this->sites = $site_ids;
 
@@ -396,7 +400,7 @@ class WP_Site_Query {
 
 		// Prime site network caches.
 		if ( $this->query_vars['update_site_cache'] ) {
-			_prime_site_caches( $site_ids, $this->query_vars['update_site_meta_cache'] );
+			_prime_site_caches( $site_ids, false );
 		}
 
 		// Fetch full site objects from the primed cache.

wp-includes/ms-site.php

@@ -340,6 +340,7 @@ function get_site( $site = null ) {
  * @since 4.6.0
  * @since 5.1.0 Introduced the `$update_meta_cache` parameter.
  * @since 6.1.0 This function is no longer marked as "private".
+ * @since 6.3.0 Use wp_lazyload_site_meta() for lazy-loading of site meta.
  *
  * @see update_site_cache()
  * @global wpdb $wpdb WordPress database abstraction object.
@@ -354,8 +355,27 @@ function _prime_site_caches( $ids, $update_meta_cache = true ) {
 	if ( ! empty( $non_cached_ids ) ) {
 		$fresh_sites = $wpdb->get_results( sprintf( "SELECT * FROM $wpdb->blogs WHERE blog_id IN (%s)", implode( ',', array_map( 'intval', $non_cached_ids ) ) ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
 
-		update_site_cache( $fresh_sites, $update_meta_cache );
+		update_site_cache( $fresh_sites, false );
 	}
+
+	if ( $update_meta_cache ) {
+		wp_lazyload_site_meta( $ids );
+	}
+}
+
+/**
+ * Queue site meta for lazy-loading.
+ *
+ * @since 6.3.0
+ *
+ * @param array $site_ids List of site IDs.
+ */
+function wp_lazyload_site_meta( array $site_ids ) {
+	if ( empty( $site_ids ) ) {
+		return;
+	}
+	$lazyloader = wp_metadata_lazyloader();
+	$lazyloader->queue_objects( 'blog', $site_ids );
 }
 
 /**

wp-includes/user.php

@@ -1004,9 +1004,8 @@ function get_blogs_of_user( $user_id, $all = false ) {
 
 	if ( ! empty( $site_ids ) ) {
 		$args = array(
-			'number'                 => '',
-			'site__in'               => $site_ids,
-			'update_site_meta_cache' => false,
+			'number'   => '',
+			'site__in' => $site_ids,
 		);
 		if ( ! $all ) {
 			$args['archived'] = 0;

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55746';
+$wp_version = '6.3-alpha-55747';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.