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Users: Cache database queries within WP_User_Query class.

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Cache the results of database queries within `WP_User_Query` class. Only cache queries that are requesting 3 or less fields so that caches are not storing full user objects. Cache results are stored in a new global cache group named `users-queries`. Add a new parameter to `WP_User_Query` called `cache_results` to allow developers to opt out of a receiving cached results. `cache_results` parameter defaults to true. Also add a new helper function called `wp_cache_set_users_last_changed`, similar to `wp_cache_set_posts_last_changed` that incroments last changed value in cache group `users`.  Ensure that `wp_cache_set_users_last_changed` is called whenever user / user meta is modified for proper cache invalidation. 

Props johnjamesjacoby, spacedmonkey, westi, dd32, strategio, srikanthmeenakshi, OllieJones, khoipro, rjasdfiii, flixos90, mukesh27, peterwilsoncc. 
Fixes #40613.
Built from https://develop.svn.wordpress.org/trunk@55657


git-svn-id: http://core.svn.wordpress.org/trunk@55169 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
spacedmonkey 2023-04-18 11:50:27 +00:00
parent cc03c195c1
commit 2a82f1527d
7 changed files with 117 additions and 20 deletions
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113
wp-includes/class-wp-user-query.php
View File

@ -119,6 +119,7 @@ class WP_User_Query {
'login' => '',
'login__in' => array(),
'login__not_in' => array(),
'cache_results' => true,
);
return wp_parse_args( $args, $defaults );
@ -140,6 +141,7 @@ class WP_User_Query {
* @since 5.1.0 Introduced the 'meta_compare_key' parameter.
* @since 5.3.0 Introduced the 'meta_type_key' parameter.
* @since 5.9.0 Added 'capability', 'capability__in', and 'capability__not_in' parameters.
* @since 6.3.0 Added 'cache_results' parameter.
*
* @global wpdb $wpdb WordPress database abstraction object.
* @global WP_Roles $wp_roles WordPress role management object.
@ -254,6 +256,7 @@ class WP_User_Query {
* logins will be included in results. Default empty array.
* @type string[] $login__not_in An array of logins to exclude. Users matching one of these
* logins will not be included in results. Default empty array.
* @type bool $cache_results Whether to cache user information. Default true.
* }
*/
public function prepare_query( $query = array() ) {
@ -790,6 +793,11 @@ class WP_User_Query {
$qv =& $this->query_vars;
// Do not cache results if more than 3 fields are requested.
if ( is_array( $qv['fields'] ) && count( $qv['fields'] ) > 3 ) {
$qv['cache_results'] = false;
}
/**
* Filters the users array before the query takes place.
*
@ -816,28 +824,47 @@ class WP_User_Query {
{$this->query_orderby}
{$this->query_limit}
";
if ( is_array( $qv['fields'] ) ) {
$this->results = $wpdb->get_results( $this->request );
} else {
$this->results = $wpdb->get_col( $this->request );
$cache_value = false;
$cache_key = $this->generate_cache_key( $qv, $this->request );
$cache_group = 'users-queries';
if ( $qv['cache_results'] ) {
$cache_value = wp_cache_get( $cache_key, $cache_group );
}
if ( false !== $cache_value ) {
$this->results = $cache_value['user_data'];
$this->total_users = $cache_value['total_users'];
} else {
if ( isset( $qv['count_total'] ) && $qv['count_total'] ) {
/**
* Filters SELECT FOUND_ROWS() query for the current WP_User_Query instance.
*
* @since 3.2.0
* @since 5.1.0 Added the `$this` parameter.
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $sql The SELECT FOUND_ROWS() query for the current WP_User_Query.
* @param WP_User_Query $query The current WP_User_Query instance.
*/
$found_users_query = apply_filters( 'found_users_query', 'SELECT FOUND_ROWS()', $this );
if ( is_array( $qv['fields'] ) ) {
$this->results = $wpdb->get_results( $this->request );
} else {
$this->results = $wpdb->get_col( $this->request );
}
$this->total_users = (int) $wpdb->get_var( $found_users_query );
if ( isset( $qv['count_total'] ) && $qv['count_total'] ) {
/**
* Filters SELECT FOUND_ROWS() query for the current WP_User_Query instance.
*
* @since 3.2.0
* @since 5.1.0 Added the `$this` parameter.
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $sql The SELECT FOUND_ROWS() query for the current WP_User_Query.
* @param WP_User_Query $query The current WP_User_Query instance.
*/
$found_users_query = apply_filters( 'found_users_query', 'SELECT FOUND_ROWS()', $this );
$this->total_users = (int) $wpdb->get_var( $found_users_query );
}
if ( $qv['cache_results'] ) {
$cache_value = array(
'user_data' => $this->results,
'total_users' => $this->total_users,
);
wp_cache_add( $cache_key, $cache_value, $cache_group );
}
}
}
@ -1010,6 +1037,54 @@ class WP_User_Query {
return $_orderby;
}
/**
* Generate cache key.
*
* @since 6.3.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param array $args Query arguments.
* @param string $sql SQL statement.
* @return string Cache key.
*/
protected function generate_cache_key( array $args, $sql ) {
global $wpdb;
// Replace wpdb placeholder in the SQL statement used by the cache key.
$sql = $wpdb->remove_placeholder_escape( $sql );
$key = md5( $sql );
$last_changed = wp_cache_get_last_changed( 'users' );
if ( empty( $args['orderby'] ) ) {
// Default order is by 'user_login'.
$ordersby = array( 'user_login' => '' );
} elseif ( is_array( $args['orderby'] ) ) {
$ordersby = $args['orderby'];
} else {
// 'orderby' values may be a comma- or space-separated list.
$ordersby = preg_split( '/[,\s]+/', $args['orderby'] );
}
$blog_id = 0;
if ( isset( $args['blog_id'] ) ) {
$blog_id = absint( $args['blog_id'] );
}
if ( ( $args['has_published_posts'] && $blog_id ) || in_array( 'post_count', $ordersby, true ) ) {
$switch = get_current_blog_id() !== $blog_id;
if ( $switch ) {
switch_to_blog( $blog_id );
}
$last_changed .= wp_cache_get_last_changed( 'posts' );
if ( $switch ) {
restore_current_blog();
}
}
return "get_users:$key:$last_changed";
}
/**
* Parses an 'order' query variable and casts it to ASC or DESC as necessary.
*

8
wp-includes/default-filters.php
View File

@ -115,6 +115,14 @@ add_action( 'added_post_meta', 'wp_cache_set_posts_last_changed' );
add_action( 'updated_post_meta', 'wp_cache_set_posts_last_changed' );
add_action( 'deleted_post_meta', 'wp_cache_set_posts_last_changed' );
// User meta.
add_action( 'added_user_meta', 'wp_cache_set_users_last_changed' );
add_action( 'updated_user_meta', 'wp_cache_set_users_last_changed' );
add_action( 'deleted_user_meta', 'wp_cache_set_users_last_changed' );
add_action( 'add_user_role', 'wp_cache_set_users_last_changed' );
add_action( 'set_user_role', 'wp_cache_set_users_last_changed' );
add_action( 'remove_user_role', 'wp_cache_set_users_last_changed' );
// Term meta.
add_action( 'added_term_meta', 'wp_cache_set_terms_last_changed' );
add_action( 'updated_term_meta', 'wp_cache_set_terms_last_changed' );

1
wp-includes/load.php
View File

@ -776,6 +776,7 @@ function wp_start_object_cache() {
'usermeta',
'user_meta',
'userslugs',
'users-queries',
)
);

2
wp-includes/ms-blogs.php
View File

@ -573,6 +573,7 @@ function switch_to_blog( $new_blog_id, $deprecated = null ) {
'usermeta',
'user_meta',
'userslugs',
'users-queries',
)
);
}
@ -666,6 +667,7 @@ function restore_current_blog() {
'usermeta',
'user_meta',
'userslugs',
'users-queries',
)
);
}

1
wp-includes/ms-functions.php
View File

@ -295,6 +295,7 @@ function remove_user_from_blog( $user_id, $blog_id = 0, $reassign = 0 ) {
}
}
clean_user_cache( $user_id );
restore_current_blog();
return true;

10
wp-includes/user.php
View File

@ -1907,6 +1907,7 @@ function clean_user_cache( $user ) {
}
wp_cache_delete( $user->ID, 'user_meta' );
wp_cache_set_users_last_changed();
/**
* Fires immediately after the given user's cache is cleaned.
@ -5016,3 +5017,12 @@ function wp_register_persisted_preferences_meta() {
)
);
}
/**
* Sets the last changed time for the 'users' cache group.
*
* @since 6.3.0
*/
function wp_cache_set_users_last_changed() {
wp_cache_set( 'last_changed', microtime(), 'users' );
}

2
wp-includes/version.php
View File

@ -16,7 +16,7 @@
*
* @global string $wp_version
*/
$wp_version = '6.3-alpha-55656';
$wp_version = '6.3-alpha-55657';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.