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<?php |
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/** |
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* This class does a full resync of the database by |
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* enqueuing an outbound action for every single object |
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* that we care about. |
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* |
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* This class, and its related class Jetpack_Sync_Module, contain a few non-obvious optimisations that should be explained: |
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* - we fire an action called jetpack_full_sync_start so that WPCOM can erase the contents of the cached database |
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* - for each object type, we page through the object IDs and enqueue them by firing some monitored actions |
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* - we load the full objects for those IDs in chunks of Jetpack_Sync_Module::ARRAY_CHUNK_SIZE (to reduce the number of MySQL calls) |
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* - we fire a trigger for the entire array which the Jetpack_Sync_Listener then serializes and queues. |
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*/ |
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require_once 'class.jetpack-sync-wp-replicastore.php'; |
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class Jetpack_Sync_Module_Full_Sync extends Jetpack_Sync_Module { |
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const STATUS_OPTION = 'jetpack_full_sync_status'; |
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const FULL_SYNC_TIMEOUT = 3600; |
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public function name() { |
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return 'full-sync'; |
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} |
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function init_listeners( $callable ) { |
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// synthetic actions for full sync |
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add_action( 'jetpack_full_sync_start', $callable ); |
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add_action( 'jetpack_full_sync_end', $callable ); |
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} |
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function init_before_send() { |
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// this is triggered after actions have been processed on the server |
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add_action( 'jetpack_sync_processed_actions', array( $this, 'update_sent_progress_action' ) ); |
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} |
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function start( $modules = null ) { |
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if ( ! $this->should_start_full_sync() ) { |
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return false; |
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} |
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// ensure listener is loaded so we can guarantee full sync actions are enqueued |
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require_once dirname( __FILE__ ) . '/class.jetpack-sync-listener.php'; |
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Jetpack_Sync_Listener::get_instance(); |
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/** |
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* Fires when a full sync begins. This action is serialized |
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* and sent to the server so that it knows a full sync is coming. |
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* |
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* @since 4.2.0 |
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*/ |
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do_action( 'jetpack_full_sync_start' ); |
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$this->set_status_queuing_started(); |
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foreach ( Jetpack_Sync_Modules::get_modules() as $module ) { |
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$module_name = $module->name(); |
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if ( is_array( $modules ) && ! in_array( $module_name, $modules ) ) { |
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continue; |
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} |
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$items_enqueued = $module->enqueue_full_sync_actions(); |
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if ( $items_enqueued !== 0 ) { |
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$status = $this->get_status(); |
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if ( ! isset( $status['queue'][ $module_name ] ) ) { |
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$status['queue'][ $module_name ] = 0; |
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} |
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$status['queue'][ $module_name ] += $items_enqueued; |
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$this->update_status( $status ); |
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} |
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} |
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$this->set_status_queuing_finished(); |
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$store = new Jetpack_Sync_WP_Replicastore(); |
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/** |
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* Fires when a full sync ends. This action is serialized |
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* and sent to the server with checksums so that we can confirm the |
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* sync was successful. |
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* |
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* @since 4.2.0 |
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*/ |
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do_action( 'jetpack_full_sync_end', $store->checksum_all() ); |
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return true; |
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} |
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private function should_start_full_sync() { |
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$status = $this->get_status(); |
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// We should try sync if we haven't started it yet or if we have finished it. |
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if ( is_null( $status['started'] ) || is_integer( $status['finished'] ) ) { |
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return true; |
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} |
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// allow enqueuing if last full sync was started more than FULL_SYNC_TIMEOUT seconds ago |
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if ( intval( $status['started'] ) + self::FULL_SYNC_TIMEOUT < time() ) { |
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return true; |
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} |
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return false; |
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} |
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function update_sent_progress_action( $actions ) { |
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// quick way to map to first items with an array of arrays |
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$actions_with_counts = array_count_values( array_map( 'reset', $actions ) ); |
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$status = $this->get_status(); |
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if ( is_null( $status['started'] ) || $status['finished'] ) { |
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return; |
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} |
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if ( isset( $actions_with_counts['jetpack_full_sync_start'] ) ) { |
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$status['sent_started'] = time(); |
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} |
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foreach ( Jetpack_Sync_Modules::get_modules() as $module ) { |
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$module_name = $module->name(); |
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$module_actions = $module->get_full_sync_actions(); |
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foreach ( $module_actions as $module_action ) { |
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if ( isset( $actions_with_counts[ $module_action ] ) ) { |
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if ( ! isset( $status['sent'][ $module_name ] ) ) { |
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$status['sent'][ $module_name ] = 0; |
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} |
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$status['sent'][ $module_name ] += $actions_with_counts[ $module_action ]; |
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} |
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} |
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} |
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if ( isset( $actions_with_counts['jetpack_full_sync_end'] ) ) { |
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$status['finished'] = time(); |
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} |
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$this->update_status( $status ); |
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} |
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private function set_status_queuing_started() { |
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$status = $this->initial_status; |
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$status['started'] = time(); |
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$this->update_status( $status ); |
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} |
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private function set_status_queuing_finished() { |
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$this->update_status( array( 'queue_finished' => time() ) ); |
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} |
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private $initial_status = array( |
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'started' => null, |
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'queue_finished' => null, |
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'sent_started' => null, |
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'finished' => null, |
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'sent' => array(), |
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'queue' => array(), |
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); |
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public function get_status() { |
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return get_option( self::STATUS_OPTION, $this->initial_status ); |
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} |
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public function update_status( $status ) { |
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return update_option( |
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self::STATUS_OPTION, |
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array_merge( $this->get_status(), $status ) |
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); |
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} |
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public function clear_status() { |
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delete_option( self::STATUS_OPTION ); |
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} |
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} |
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Automattic /
jetpack
