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Cache Global-Styles #25680

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merged 2 commits into from
Nov 13, 2020
Merged

Cache Global-Styles #25680

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7c43a84
Cache for a minute using a transient
aristath Sep 28, 2020
faaa444
Merge branch 'master' into try/global-styles-cache-25678
aristath Oct 9, 2020
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25 changes: 25 additions & 0 deletions lib/global-styles.php
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Original file line number Diff line number Diff line change
Expand Up @@ -586,6 +586,24 @@ function gutenberg_experimental_global_styles_flatten_styles_tree( $styles ) {
* @return string Stylesheet.
*/
function gutenberg_experimental_global_styles_get_stylesheet( $tree ) {

// Check if we can use cached.
$can_use_cached = (
( ! defined( 'WP_DEBUG' ) || ! WP_DEBUG ) &&
( ! defined( 'SCRIPT_DEBUG' ) || ! SCRIPT_DEBUG ) &&
( ! defined( 'REST_REQUEST' ) || ! REST_REQUEST ) &&
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! is_admin()
);

if ( $can_use_cached ) {

// Check if we have the styles already cached.
$cached = get_transient( 'global_styles' );
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When we have extensibility we need to document very well what plugins can do. If a plugin changes global styles depending on the page, for example, the caching solution makes things not work well because we have a global cache, so the value will be equal on all pages.

if ( $cached ) {
return $cached;
}
}

$stylesheet = '';
$block_data = gutenberg_experimental_global_styles_get_block_data();
foreach ( array_keys( $tree ) as $block_name ) {
Expand Down Expand Up @@ -644,6 +662,13 @@ function gutenberg_experimental_global_styles_get_stylesheet( $tree ) {
$stylesheet .= 'a{color:var(--wp--style--color--link, #00e);}';
}

if ( $can_use_cached ) {

// Cache for a minute.
// This cache doesn't need to be any longer, we only want to avoid spikes on high-trafic sites.
set_transient( 'global_styles', $stylesheet, MINUTE_IN_SECONDS );
}

return $stylesheet;
}

Expand Down