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Add object caching for WP_Theme_JSON::compute_style_properties #5567

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Add object caching for WP_Theme_JSON::compute_style_properties #5567

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85e9170
Add object caching for `WP_Theme_JSON::compute_style_properties`
Oct 24, 2023
7450d26
The values of the args are only useful for the cache key
Oct 24, 2023
c9b36ea
Deal with cache before updating `$properties`
Oct 24, 2023
dd8c83e
Only use cache if not in dev mode for theme. Ensure we do not process…
Nov 3, 2023
7d97433
Address PHPCS warning. It really does not matter if the value of `$pr…
Nov 3, 2023
bd6f08c
Merge branch 'WordPress:trunk' into add/object-cache-compute-style-pr…
pereirinha Jan 4, 2024
2377348
Remove unecessary dev mode check for cache
Jan 4, 2024
d707a79
Add the global settings to the cache key recipe, so that when it chan…
Jan 4, 2024
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Add the global settings to the cache key recipe, so that when it chan… 
…ges, it invalidates the cache
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Marco Pereirinha committed Jan 4, 2024
commit d707a79b5eb8d9ba81fb808e234138d2ead8264a
3 changes: 2 additions & 1 deletion src/wp-includes/class-wp-theme-json.php
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Expand Up @@ -1934,7 +1934,8 @@ protected static function compute_style_properties( $styles, $settings = array()
return $declarations;
}

$args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.Changed
// The global settings can include dynamic data related to typography. We need evaluate it so that the cache is invalidated when it changes.
$args = array( func_get_args(), wp_get_global_settings() ); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.Changed
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@oandregal oandregal Jan 15, 2024 •
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The way the theme.json code is organized is as follows:

  1. WP_Theme_JSON: private class that deals with a theme.json structure. It doesn't depend on anything else.
  2. WP_Theme_JSON_Resolver: private class that pulls data (theme.json files, theme.json from database) and merges it together appropriately (get_merged_data). It depends on the WP_Theme_JSON class.
  3. Public API: functions such as wp_get_global_settings, wp_get_global_styles, etc. They use and depend on the two previous private classes.

By using a public function such as wp_get_global_settings in the WP_Theme_JSON class, this code is creating a circular dependency. This code is saying: when processing any theme.json structure, read all existing theme.json (core, blocks, theme, user) first.

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@joemcgill joemcgill Jan 17, 2024

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Thanks for the feedback @oandregal. This makes perfect sense. I think we would either need to add the caching to the public function that relies on WP_Theme_JSON::compute_style_properties or find a different approach to invalidation within WP_Theme_JSON.

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@pereirinha pereirinha Jan 17, 2024

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Thanks for the feedback @oandregal. I'll have a closer look at this

$cache_key = 'compute_style_properties_' . md5( wp_json_encode( $args ) );
$cache = wp_cache_get( $cache_key, 'wp-styles' );
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@joemcgill joemcgill Jan 8, 2024

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Rather than introducing a new cache group, I think this should be a part of the existing theme_json group. Would need to change it below where this cache value is set, as well.

Suggested change
$cache = wp_cache_get( $cache_key, 'wp-styles' );
$cache = wp_cache_get( $cache_key, 'theme_json' );


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