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| 1 | <?php |
| 2 | |
| 3 | namespace Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache; |
| 4 | |
| 5 | use Automattic\Jetpack_Boost\Contracts\Has_Activate; |
| 6 | use Automattic\Jetpack_Boost\Contracts\Has_Deactivate; |
| 7 | use Automattic\Jetpack_Boost\Contracts\Is_Always_On; |
| 8 | use Automattic\Jetpack_Boost\Contracts\Sub_Feature; |
| 9 | use Automattic\Jetpack_Boost\Lib\Cornerstone\Cornerstone_Utils; |
| 10 | use Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache\Pre_WordPress\Boost_Cache; |
| 11 | use Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache\Pre_WordPress\Logger; |
| 12 | |
| 13 | /** |
| 14 | * Class Cache_Preload |
| 15 | * |
| 16 | * Handles the rebuilding/preloading of cache for pages, currently only for Cornerstone Pages. |
| 17 | * This module automagically preloads the cache after cache invalidation events such as rebuilds, or when |
| 18 | * Cornerstone Pages are updated, to ensure that important pages always have a cache. |
| 19 | * |
| 20 | * @since 3.11.0 |
| 21 | * @package Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache |
| 22 | */ |
| 23 | class Cache_Preload implements Sub_Feature, Has_Activate, Has_Deactivate, Is_Always_On { |
| 24 | |
| 25 | /** |
| 26 | * @since 3.11.0 |
| 27 | */ |
| 28 | public function setup() { |
| 29 | add_action( 'update_option_jetpack_boost_ds_cornerstone_pages_list', array( $this, 'schedule_cornerstone' ) ); |
| 30 | add_action( 'jetpack_boost_preload_cornerstone', array( $this, 'preload_cornerstone' ) ); |
| 31 | add_action( 'jetpack_boost_preload', array( $this, 'preload' ) ); |
| 32 | |
| 33 | add_action( 'post_updated', array( $this, 'handle_post_update' ) ); |
| 34 | add_action( 'jetpack_boost_invalidate_cache_success', array( $this, 'handle_cache_invalidation' ), 10, 3 ); |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * @since 3.11.0 |
| 39 | */ |
| 40 | public static function get_slug() { |
| 41 | return 'cache_preload'; |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * @since 3.11.0 |
| 46 | */ |
| 47 | public static function is_available() { |
| 48 | return true; |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * As this is a submodule, this activate is triggered when the parent module is activated, |
| 53 | * despite the module having Is_Always_On. |
| 54 | * |
| 55 | * @since 3.12.0 |
| 56 | */ |
| 57 | public static function activate() { |
| 58 | $instance = new self(); |
| 59 | $instance->schedule_cornerstone_cronjob(); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * |
| 64 | * @since 3.12.0 |
| 65 | */ |
| 66 | public static function deactivate() { |
| 67 | wp_unschedule_hook( 'jetpack_boost_preload_cornerstone' ); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Schedule the cronjob to preload the cache for Cornerstone Pages. |
| 72 | * |
| 73 | * @since 3.12.0 |
| 74 | * @return void |
| 75 | */ |
| 76 | public function schedule_cornerstone_cronjob() { |
| 77 | if ( ! wp_next_scheduled( 'jetpack_boost_preload_cornerstone' ) ) { |
| 78 | wp_schedule_event( time(), 'twicehourly', 'jetpack_boost_preload_cornerstone' ); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Schedule Preload for all Cornerstone Pages. |
| 84 | * |
| 85 | * This method is triggered when the Cornerstone Pages list is updated, |
| 86 | * ensuring all Cornerstone Pages have their cache rebuilt. |
| 87 | * |
| 88 | * @since 3.12.0 |
| 89 | * @return void |
| 90 | */ |
| 91 | public function schedule_cornerstone() { |
| 92 | wp_schedule_single_event( time(), 'jetpack_boost_preload_cornerstone' ); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Schedule a rebuild for the given URLs. |
| 97 | * |
| 98 | * @since 3.12.0 |
| 99 | * @param array $urls The URLs of the Cornerstone Pages to rebuild. |
| 100 | * @return void |
| 101 | */ |
| 102 | public function schedule( array $urls ) { |
| 103 | Logger::debug( sprintf( 'Scheduling preload for %d pages', count( $urls ) ) ); |
| 104 | wp_schedule_single_event( time(), 'jetpack_boost_preload', array( $urls ) ); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Rebuild the cache for all Cornerstone Pages. |
| 109 | * |
| 110 | * @since 3.12.0 |
| 111 | * @return void |
| 112 | */ |
| 113 | public function preload_cornerstone() { |
| 114 | $urls = Cornerstone_Utils::get_list(); |
| 115 | $this->preload( $urls ); |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Rebuild the cache for the given URLs. |
| 120 | * |
| 121 | * @since 3.12.0 |
| 122 | * @param array $urls The URLs of the pages to preload. |
| 123 | * @return void |
| 124 | */ |
| 125 | public function preload( array $urls ) { |
| 126 | Logger::debug( sprintf( 'Preload started for %d pages', count( $urls ) ) ); |
| 127 | |
| 128 | // Pause the hook here to avoid an infinite loop of: invalidation → preload → invalidation. |
| 129 | remove_action( 'jetpack_boost_invalidate_cache_success', array( $this, 'handle_cache_invalidation' ) ); |
| 130 | $boost_cache = new Boost_Cache(); |
| 131 | foreach ( $urls as $url ) { |
| 132 | $boost_cache->rebuild_page( $url ); |
| 133 | $this->request_page( $url ); |
| 134 | } |
| 135 | add_action( 'jetpack_boost_invalidate_cache_success', array( $this, 'handle_cache_invalidation' ), 10, 3 ); |
| 136 | |
| 137 | Logger::debug( sprintf( 'Preload completed for %d pages', count( $urls ) ) ); |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Requests the pages scheduled for preload. |
| 142 | * |
| 143 | * @since 3.11.0 |
| 144 | * @param array $posts The posts to preload. |
| 145 | * @return void |
| 146 | */ |
| 147 | public function request_pages( $posts ) { |
| 148 | if ( empty( $posts ) ) { |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | foreach ( $posts as $url ) { |
| 153 | $this->request_page( $url ); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Make an HTTP request to the specified URL to generate a fresh cache entry. |
| 159 | * |
| 160 | * @since 3.11.0 |
| 161 | * @param string $page The URL of the page to preload. |
| 162 | * @return void |
| 163 | */ |
| 164 | private function request_page( string $page ) { |
| 165 | // Add a cache-busting header to ensure our response is fresh. |
| 166 | $args = array( |
| 167 | 'headers' => array( |
| 168 | 'Cache-Control' => 'no-cache, no-store, must-revalidate, max-age=0', |
| 169 | 'Pragma' => 'no-cache', |
| 170 | 'Expires' => '0', |
| 171 | ), |
| 172 | ); |
| 173 | |
| 174 | $response = wp_remote_get( $page, $args ); |
| 175 | |
| 176 | if ( is_wp_error( $response ) ) { |
| 177 | Logger::debug( 'Error preloading page: ' . $response->get_error_message() ); |
| 178 | return; |
| 179 | } |
| 180 | |
| 181 | $status_code = wp_remote_retrieve_response_code( $response ); |
| 182 | if ( $status_code !== 200 ) { |
| 183 | Logger::debug( sprintf( 'Error preloading page %s: HTTP status code %d', $page, $status_code ) ); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Handle post updates to check if the post is a cornerstone page and schedule preload if needed. |
| 189 | * |
| 190 | * @since 3.11.0 |
| 191 | * @param int $post_id The ID of the post being updated. |
| 192 | * @return void |
| 193 | */ |
| 194 | public function handle_post_update( int $post_id ) { |
| 195 | if ( Cornerstone_Utils::is_cornerstone_page( $post_id ) ) { |
| 196 | $this->schedule( array( get_permalink( $post_id ) ) ); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * Handle cache invalidation events to schedule preloading for affected pages. |
| 202 | * |
| 203 | * If cache for Cornerstone Pages is invalidated, this method schedules those pages |
| 204 | * for preloading to ensure they have fresh cache. |
| 205 | * |
| 206 | * @since 3.11.0 |
| 207 | * @param string $path The path that was invalidated. |
| 208 | * @param string $type The type of invalidation that occurred (rebuild or delete). |
| 209 | * @param string $scope The scope of the invalidation (page or recursive). |
| 210 | * @return void |
| 211 | */ |
| 212 | public function handle_cache_invalidation( string $path, string $type, string $scope ) { |
| 213 | if ( $path === home_url() && $scope === 'recursive' ) { |
| 214 | Logger::debug( 'Invalidating all files, scheduling preload for all Cornerstone Pages.' ); |
| 215 | // If the cache is invalidated for all files, schedule preload for all Cornerstone Pages. |
| 216 | $this->schedule_cornerstone(); |
| 217 | return; |
| 218 | } |
| 219 | |
| 220 | // Otherwise identify if a Cornerstone Page cache file is being deleted and schedule preload that page if it is. |
| 221 | Logger::debug( 'Invalidating a specific page, scheduling preload for that page if it is a Cornerstone Page.' ); |
| 222 | $cornerstone_pages = Cornerstone_Utils::get_list(); |
| 223 | $cornerstone_pages = array_map( 'untrailingslashit', $cornerstone_pages ); |
| 224 | // If the $path is in the Cornerstone Page list, add it to the preload list. |
| 225 | if ( in_array( untrailingslashit( $path ), $cornerstone_pages, true ) ) { |
| 226 | $this->schedule( array( $path ) ); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | public static function get_parent_features(): array { |
| 231 | return array( |
| 232 | Page_Cache::class, |
| 233 | ); |
| 234 | } |
| 235 | } |