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<?php
/**
* Abstract WP_Background_Process class.
*
* Uses https://github.com/A5hleyRich/wp-background-processing to handle DB
* updates in the background.
*
* @package WooCommerce\Classes
*/
defined( 'ABSPATH' ) || exit;
if ( ! class_exists( 'WP_Async_Request', false ) ) {
include_once dirname( WC_PLUGIN_FILE ) . '/includes/libraries/wp-async-request.php';
}
if ( ! class_exists( 'WP_Background_Process', false ) ) {
include_once dirname( WC_PLUGIN_FILE ) . '/includes/libraries/wp-background-process.php';
}
/**
* WC_Background_Process class.
*/
abstract class WC_Background_Process extends WP_Background_Process {
/**
* Is queue empty.
*
* @return bool
*/
protected function is_queue_empty() {
global $wpdb;
$table = $wpdb->options;
$column = 'option_name';
if ( is_multisite() ) {
$table = $wpdb->sitemeta;
$column = 'meta_key';
}
$key = $wpdb->esc_like( $this->identifier . '_batch_' ) . '%';
$count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$table} WHERE {$column} LIKE %s", $key ) ); // @codingStandardsIgnoreLine.
return ! ( $count > 0 );
}
/**
* Get batch.
*
* @return stdClass Return the first batch from the queue.
*/
protected function get_batch() {
global $wpdb;
$table = $wpdb->options;
$column = 'option_name';
$key_column = 'option_id';
$value_column = 'option_value';
if ( is_multisite() ) {
$table = $wpdb->sitemeta;
$column = 'meta_key';
$key_column = 'meta_id';
$value_column = 'meta_value';
}
$key = $wpdb->esc_like( $this->identifier . '_batch_' ) . '%';
$query = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$table} WHERE {$column} LIKE %s ORDER BY {$key_column} ASC LIMIT 1", $key ) ); // @codingStandardsIgnoreLine.
$batch = new stdClass();
$batch->key = $query->$column;
$batch->data = array_filter( (array) maybe_unserialize( $query->$value_column ) );
return $batch;
}
/**
* See if the batch limit has been exceeded.
*
* @return bool
*/
protected function batch_limit_exceeded() {
return $this->time_exceeded() || $this->memory_exceeded();
}
/**
* Handle.
*
* Pass each queue item to the task handler, while remaining
* within server memory and time limit constraints.
*/
protected function handle() {
$this->lock_process();
do {
$batch = $this->get_batch();
foreach ( $batch->data as $key => $value ) {
$task = $this->task( $value );
if ( false !== $task ) {
$batch->data[ $key ] = $task;
} else {
unset( $batch->data[ $key ] );
}
if ( $this->batch_limit_exceeded() ) {
// Batch limits reached.
break;
}
}
// Update or delete current batch.
if ( ! empty( $batch->data ) ) {
$this->update( $batch->key, $batch->data );
} else {
$this->delete( $batch->key );
}
} while ( ! $this->batch_limit_exceeded() && ! $this->is_queue_empty() );
$this->unlock_process();
// Start next batch or complete process.
if ( ! $this->is_queue_empty() ) {
$this->dispatch();
} else {
$this->complete();
}
}
/**
* Get memory limit.
*
* @return int
*/
protected function get_memory_limit() {
if ( function_exists( 'ini_get' ) ) {
$memory_limit = ini_get( 'memory_limit' );
} else {
// Sensible default.
$memory_limit = '128M';
}
if ( ! $memory_limit || -1 === intval( $memory_limit ) ) {
// Unlimited, set to 32GB.
$memory_limit = '32G';
}
return wp_convert_hr_to_bytes( $memory_limit );
}
/**
* Schedule cron healthcheck.
*
* @param array $schedules Schedules.
* @return array
*/
public function schedule_cron_healthcheck( $schedules ) {
$interval = apply_filters( $this->identifier . '_cron_interval', 5 );
if ( property_exists( $this, 'cron_interval' ) ) {
$interval = apply_filters( $this->identifier . '_cron_interval', $this->cron_interval );
}
// Adds every 5 minutes to the existing schedules.
$schedules[ $this->identifier . '_cron_interval' ] = array(
'interval' => MINUTE_IN_SECONDS * $interval,
/* translators: %d: interval */
'display' => sprintf( __( 'Every %d minutes', 'woocommerce' ), $interval ),
);
return $schedules;
}
/**
* Delete all batches.
*
* @return WC_Background_Process
*/
public function delete_all_batches() {
global $wpdb;
$table = $wpdb->options;
$column = 'option_name';
if ( is_multisite() ) {
$table = $wpdb->sitemeta;
$column = 'meta_key';
}
$key = $wpdb->esc_like( $this->identifier . '_batch_' ) . '%';
$wpdb->query( $wpdb->prepare( "DELETE FROM {$table} WHERE {$column} LIKE %s", $key ) ); // @codingStandardsIgnoreLine.
return $this;
}
/**
* Kill process.
*
* Stop processing queue items, clear cronjob and delete all batches.
*/
public function kill_process() {
if ( ! $this->is_queue_empty() ) {
$this->delete_all_batches();
wp_clear_scheduled_hook( $this->cron_hook_identifier );
}
}
}
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