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Cache API: Allow external object caches to gracefully degrade to the default object cache. 

Rework logic for how external object caches are detected, so that if
an external cache does not define a `wp_cache_init()`, the built-in
object cache will be used.

Object caches can now wrap their entire contents in logic checks. So a
Redis caching backend could make sure that the `Redis` PHP class is
available before defining all the caching functions. And if Redis is
not available, the site doesn't break or throw errors or think it is
using caching when it isn't. This is particularly useful for doing
local development, where you might want to develop on a site without
running Memcache or Redis like you are in production.

* Accounts for multisite, which may re-initialize the object cache
multiple times.
* Accounts for object caches that may include `object-cache.php` during
`advanced-cache.php` (before WP loads it).

Props jtsternberg, markjaquith.
Fixes #22661.


Built from https://develop.svn.wordpress.org/trunk@42723


git-svn-id: http://core.svn.wordpress.org/trunk@42553 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Mark Jaquith 2018-02-21 14:59:30 +00:00
parent c7c98dd7ea
commit edfe2ece51
2 changed files with 32 additions and 21 deletions
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23
wp-includes/load.php
View File

@ -530,9 +530,19 @@ function wp_using_ext_object_cache( $using = null ) {
*/
function wp_start_object_cache() {
global $wp_filter;
static $first_init = true;
$first_init = false;
// Only perform the following checks once.
if ( $first_init ) {
if ( ! function_exists( 'wp_cache_init' ) ) {
/*
* This is the normal situation. First-run of this function. No
* caching backend has been loaded.
*
* We try to load a custom caching backend, and then, if it
* results in a wp_cache_init() function existing, we note
* that an external object cache is being used.
*/
if ( file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
require_once( WP_CONTENT_DIR . '/object-cache.php' );
if ( function_exists( 'wp_cache_init' ) ) {
@ -544,17 +554,16 @@ function wp_start_object_cache() {
$wp_filter = WP_Hook::build_preinitialized_hooks( $wp_filter );
}
}
$first_init = true;
} elseif ( ! wp_using_ext_object_cache() && file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
/*
* Sometimes advanced-cache.php can load object-cache.php before
* it is loaded here. This breaks the function_exists check above
* and can result in `$_wp_using_ext_object_cache` being set
* incorrectly. Double check if an external cache exists.
* this function is run. This breaks the function_exists() check
* above and can result in wp_using_ext_object_cache() returning
* false when actually an external cache is in use.
*/
wp_using_ext_object_cache( true );
}
}
if ( ! wp_using_ext_object_cache() ) {
require_once( ABSPATH . WPINC . '/cache.php' );
@ -575,6 +584,8 @@ function wp_start_object_cache() {
wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'useremail', 'userslugs', 'site-transient', 'site-options', 'blog-lookup', 'blog-details', 'site-details', 'rss', 'global-posts', 'blog-id-cache', 'networks', 'sites' ) );
wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) );
}
$first_init = false;
}
/**

2
wp-includes/version.php
View File

@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '5.0-alpha-42722';
$wp_version = '5.0-alpha-42723';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.