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Editing: class.jetpack-sync-module-full-sync.php

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<?php

/**
 * This class does a full resync of the database by
 * enqueuing an outbound action for every single object
 * that we care about.
 *
 * This class, and its related class Jetpack_Sync_Module, contain a few non-obvious optimisations that should be explained:
 * - we fire an action called jetpack_full_sync_start so that WPCOM can erase the contents of the cached database
 * - for each object type, we page through the object IDs and enqueue them by firing some monitored actions
 * - we load the full objects for those IDs in chunks of Jetpack_Sync_Module::ARRAY_CHUNK_SIZE (to reduce the number of MySQL calls)
 * - we fire a trigger for the entire array which the Jetpack_Sync_Listener then serializes and queues.
 */

class Jetpack_Sync_Module_Full_Sync extends Jetpack_Sync_Module {
	const STATUS_OPTION_PREFIX = 'jetpack_sync_full_';
	const FULL_SYNC_TIMEOUT = 3600;

public function name() {
		return 'full-sync';
	}

function init_full_sync_listeners( $callable ) {
		// synthetic actions for full sync
		add_action( 'jetpack_full_sync_start', $callable );
		add_action( 'jetpack_full_sync_end', $callable );
		add_action( 'jetpack_full_sync_cancelled', $callable );
	}

function init_before_send() {
		// this is triggered after actions have been processed on the server
		add_action( 'jetpack_sync_processed_actions', array( $this, 'update_sent_progress_action' ) );
	}

function start( $module_configs = null ) {
		$was_already_running = $this->is_started() && ! $this->is_finished();

// remove all evidence of previous full sync items and status
		$this->reset_data();

if ( $was_already_running ) {
			/**
			 * Fires when a full sync is cancelled.
			 *
			 * @since 4.2.0
			 */
			do_action( 'jetpack_full_sync_cancelled' );
		}

$this->update_status_option( 'started', time() );
		$this->update_status_option( 'params', $module_configs );

$enqueue_status = array();
		$full_sync_config = array();

// default value is full sync
		if ( ! is_array( $module_configs ) ) {
			$module_configs = array();
			foreach ( Jetpack_Sync_Modules::get_modules() as $module ) {
				$module_configs[ $module->name() ] = true;
			}
		}

// set default configuration, calculate totals, and save configuration if totals > 0
		foreach ( Jetpack_Sync_Modules::get_modules() as $module ) {
			$module_name = $module->name();
			$module_config = isset( $module_configs[ $module_name ] ) ? $module_configs[ $module_name ] : false;
			
			if ( ! $module_config ) {
				continue;
			}

if ( 'users' === $module_name && 'initial' === $module_config ) {
				$module_config = $module->get_initial_sync_user_config();
			}

$enqueue_status[ $module_name ] = false;

$total_items = $module->estimate_full_sync_actions( $module_config );

// if there's information to process, configure this module
			if ( ! is_null( $total_items ) && $total_items > 0 ) {
				$full_sync_config[ $module_name ] = $module_config;
				$enqueue_status[ $module_name ] = array(
					$total_items,   // total
					0,              // queued
					false,          // current state
				);
			}
		}

$this->set_config( $full_sync_config );
		$this->set_enqueue_status( $enqueue_status );

/**
		 * Fires when a full sync begins. This action is serialized
		 * and sent to the server so that it knows a full sync is coming.
		 *
		 * @since 4.2.0
		 */
		do_action( 'jetpack_full_sync_start', $full_sync_config );

$this->continue_enqueuing( $full_sync_config, $enqueue_status );

return true;
	}

function continue_enqueuing( $configs = null, $enqueue_status = null ) {
		if ( ! $this->is_started() || $this->get_status_option( 'queue_finished' ) ) {
			return;
		}

// if full sync queue is full, don't enqueue more items
		$max_queue_size_full_sync = Jetpack_Sync_Settings::get_setting( 'max_queue_size_full_sync' );
		$full_sync_queue = new Jetpack_Sync_Queue( 'full_sync' );
		
		$available_queue_slots = $max_queue_size_full_sync - $full_sync_queue->size();

if ( $available_queue_slots <= 0 ) {
			return;
		} else {
			$remaining_items_to_enqueue = min( Jetpack_Sync_Settings::get_setting( 'max_enqueue_full_sync' ), $available_queue_slots );
		}

if ( ! $configs ) {
			$configs = $this->get_config();
		}

if ( ! $enqueue_status ) {
			$enqueue_status = $this->get_enqueue_status();
		}

foreach ( Jetpack_Sync_Modules::get_modules() as $module ) {
			$module_name = $module->name();

// skip module if not configured for this sync or module is done
			if ( ! isset( $configs[ $module_name ] ) 
				|| // no module config
					! $configs[ $module_name ] 
				|| // no enqueue status
					! $enqueue_status[ $module_name ] 
				|| // finished enqueuing this module
					true === $enqueue_status[ $module_name ][ 2 ] ) {
				continue;
			}

list( $items_enqueued, $next_enqueue_state ) = $module->enqueue_full_sync_actions( $configs[ $module_name ], $remaining_items_to_enqueue, $enqueue_status[ $module_name ][ 2 ] );

$enqueue_status[ $module_name ][ 2 ] = $next_enqueue_state;

// if items were processed, subtract them from the limit
			if ( ! is_null( $items_enqueued ) && $items_enqueued > 0 ) {
				$enqueue_status[ $module_name ][ 1 ] += $items_enqueued;
				$remaining_items_to_enqueue -= $items_enqueued;
			}

// stop processing if we've reached our limit of items to enqueue
			if ( 0 >= $remaining_items_to_enqueue ) {
				$this->set_enqueue_status( $enqueue_status );
				return;
			}
		}
		
		$this->set_enqueue_status( $enqueue_status );

// setting autoload to true means that it's faster to check whether we should continue enqueuing
		$this->update_status_option( 'queue_finished', time(), true );

/**
		 * Fires when a full sync ends. This action is serialized
		 * and sent to the server.
		 *
		 * @since 4.2.0
		 */
		do_action( 'jetpack_full_sync_end', '' );
	}

function update_sent_progress_action( $actions ) {

// quick way to map to first items with an array of arrays
		$actions_with_counts = array_count_values( array_filter( array_map( array( $this, 'get_action_name' ), $actions ) ) );

if ( ! $this->is_started() || $this->is_finished() ) {
			return;
		}

if ( isset( $actions_with_counts['jetpack_full_sync_start'] ) ) {
			$this->update_status_option( 'send_started', time() );
		}

foreach ( Jetpack_Sync_Modules::get_modules() as $module ) {
			$module_actions     = $module->get_full_sync_actions();
			$status_option_name = "{$module->name()}_sent";
			$items_sent         = $this->get_status_option( $status_option_name, 0 );

foreach ( $module_actions as $module_action ) {
				if ( isset( $actions_with_counts[ $module_action ] ) ) {
					$items_sent += $actions_with_counts[ $module_action ];
				}
			}

if ( $items_sent > 0 ) {
				$this->update_status_option( $status_option_name, $items_sent );
			}	
		}

if ( isset( $actions_with_counts['jetpack_full_sync_end'] ) ) {
			$this->update_status_option( 'finished', time() );
		}
	}

public function get_action_name( $queue_item ) {
		if ( is_array( $queue_item ) && isset( $queue_item[0] ) ) {
			return $queue_item[0];
		}
		return false;
	}

public function is_started() {
		return !! $this->get_status_option( 'started' );
	}

public function is_finished() {
		return !! $this->get_status_option( 'finished' );
	}

public function get_status() {
		$status = array(
			'started'        => $this->get_status_option( 'started' ),
			'queue_finished' => $this->get_status_option( 'queue_finished' ),
			'send_started'   => $this->get_status_option( 'send_started' ),
			'finished'       => $this->get_status_option( 'finished' ),
			'sent'           => array(),
			'queue'          => array(),
			'config'         => $this->get_status_option( 'params' ),
			'total'          => array(),
		);

$enqueue_status = $this->get_enqueue_status();

foreach ( Jetpack_Sync_Modules::get_modules() as $module ) {
			$name = $module->name();

if ( ! isset( $enqueue_status[ $name ] ) ) {
				continue;
			}

list( $total, $queued, $state ) = $enqueue_status[ $name ];

if ( $total ) {
				$status[ 'total' ][ $name ] = $total;
			}

if ( $queued ) {
				$status[ 'queue' ][ $name ] = $queued;
			}
			
			if ( $sent = $this->get_status_option( "{$name}_sent" ) ) {
				$status[ 'sent' ][ $name ] = $sent;
			}
		}

return $status;
	}

public function clear_status() {
		$prefix = self::STATUS_OPTION_PREFIX;
		Jetpack_Options::delete_raw_option( "{$prefix}_started" );
		Jetpack_Options::delete_raw_option( "{$prefix}_params" );
		Jetpack_Options::delete_raw_option( "{$prefix}_queue_finished" );
		Jetpack_Options::delete_raw_option( "{$prefix}_send_started" );
		Jetpack_Options::delete_raw_option( "{$prefix}_finished" );

foreach ( Jetpack_Sync_Modules::get_modules() as $module ) {
			Jetpack_Options::delete_raw_option( "{$prefix}_{$module->name()}_sent" );
		}
	}

public function reset_data() {
		$this->clear_status();
		require_once dirname( __FILE__ ) . '/class.jetpack-sync-listener.php';
		$listener = Jetpack_Sync_Listener::get_instance();
		$listener->get_full_sync_queue()->reset();
	}

private function get_status_option( $name, $default = null ) {
		$value = Jetpack_Options::get_raw_option( self::STATUS_OPTION_PREFIX . "_$name", $default );

return is_numeric( $value ) ? intval( $value ) : $value;
	}

private function update_status_option( $name, $value, $autoload = false ) {
		Jetpack_Options::update_raw_option( self::STATUS_OPTION_PREFIX . "_$name", $value, $autoload );
	}

private function set_enqueue_status( $new_status ) {
		Jetpack_Options::update_raw_option( 'jetpack_sync_full_enqueue_status', $new_status );
	}

private function get_enqueue_status() {
		return Jetpack_Options::get_raw_option( 'jetpack_sync_full_enqueue_status' );
	}

private function set_config( $config ) {
		Jetpack_Options::update_raw_option( 'jetpack_sync_full_config', $config );
	}
	
	private function get_config() {
		return Jetpack_Options::get_raw_option( 'jetpack_sync_full_config' );
	}

private function write_option( $name, $value ) {
		// we write our own option updating code to bypass filters/caching/etc on set_option/get_option
		global $wpdb;
		$serialized_value = maybe_serialize( $value );
		// try updating, if no update then insert
		// TODO: try to deal with the fact that unchanged values can return updated_num = 0
		// below we used "insert ignore" to at least suppress the resulting error
		$updated_num = $wpdb->query(
			$wpdb->prepare(
				"UPDATE $wpdb->options SET option_value = %s WHERE option_name = %s", 
				$serialized_value,
				$name
			)
		);

if ( ! $updated_num ) {
			$updated_num = $wpdb->query(
				$wpdb->prepare(
					"INSERT IGNORE INTO $wpdb->options ( option_name, option_value, autoload ) VALUES ( %s, %s, 'no' )", 
					$name,
					$serialized_value
				)
			);
		}
		return $updated_num;
	}

private function read_option( $name, $default = null ) {
		global $wpdb;
		$value = $wpdb->get_var( 
			$wpdb->prepare(
				"SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", 
				$name
			)
		);
		$value = maybe_unserialize( $value );

if ( $value === null && $default !== null ) {
			return $default;
		}

return $value;
	}
}

Editing: class.jetpack-sync-module-full-sync.php

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