WC_Coupon_Data_Store_CPT::check_and_hold_coupon() │ public │ WC 1.0

Check and records coupon usage tentatively for short period of time so that counts validation is correct. Returns early if there is no limit defined for the coupon.

Метод класса: WC_Coupon_Data_Store_CPT{}

Хуки из метода

Возвращает

true|false|int|Строку|null. Returns meta key if coupon was held, null if returned early.

Использование

$WC_Coupon_Data_Store_CPT = new WC_Coupon_Data_Store_CPT();
$WC_Coupon_Data_Store_CPT->check_and_hold_coupon( $coupon );
$coupon(WC_Coupon) (обязательный)
Coupon object.

Код WC_Coupon_Data_Store_CPT::check_and_hold_coupon() WC 8.7.0

woocommerce/includes/data-stores/class-wc-coupon-data-store-cpt.php 
public function check_and_hold_coupon( $coupon ) {
	global $wpdb;

	$usage_limit = $coupon->get_usage_limit();
	$held_time   = $this->get_tentative_held_time();

	if ( 0 >= $usage_limit || 0 >= $held_time ) {
		return null;
	}

	if ( ! apply_filters( 'woocommerce_hold_stock_for_checkout', true ) ) {
		return null;
	}

	// Make sure we have usage_count meta key for this coupon because its required for `$query_for_usages`.
	// We are not directly modifying `$query_for_usages` to allow for `usage_count` not present only keep that query simple.
	if ( ! metadata_exists( 'post', $coupon->get_id(), 'usage_count' ) ) {
		$coupon->set_usage_count( $coupon->get_usage_count() ); // Use `get_usage_count` here to write default value, which may changed by a filter.
		$coupon->save();
	}

	$query_for_usages = $wpdb->prepare(
		"
		SELECT meta_value from $wpdb->postmeta
		WHERE {$wpdb->postmeta}.meta_key = 'usage_count'
		AND {$wpdb->postmeta}.post_id = %d
		LIMIT 1
		FOR UPDATE
		",
		$coupon->get_id()
	);

	$query_for_tentative_usages = $this->get_tentative_usage_query( $coupon->get_id() );
	$db_timestamp               = $wpdb->get_var( 'SELECT UNIX_TIMESTAMP() FROM ' . $wpdb->posts . ' LIMIT 1' );

	$coupon_usage_key = '_coupon_held_' . ( (int) $db_timestamp + $held_time ) . '_' . wp_generate_password( 6, false );

	$insert_statement = $wpdb->prepare(
		"
		INSERT INTO $wpdb->postmeta ( post_id, meta_key, meta_value )
		SELECT %d, %s, %s FROM $wpdb->posts
		WHERE ( $query_for_usages ) + ( $query_for_tentative_usages ) < %d
		LIMIT 1",
		$coupon->get_id(),
		$coupon_usage_key,
		'',
		$usage_limit
	); // WPCS: unprepared SQL ok.

	/**
	 * In some cases, specifically when there is a combined index on post_id,meta_key, the insert statement above could end up in a deadlock.
	 * We will try to insert 3 times before giving up to recover from deadlock.
	 */
	for ( $count = 0; $count < 3; $count++ ) {
		$result = $wpdb->query( $insert_statement ); // WPCS: unprepared SQL ok.
		if ( false !== $result ) {
			// Clear meta cache.
			$this->refresh_coupon_data( $coupon );
			break;
		}
	}

	return $result > 0 ? $coupon_usage_key : $result;
}