<?php
/**
* Handle product stock reservation during checkout.
*/
namespace Automattic\WooCommerce\Checkout\Helpers;
defined( 'ABSPATH' ) || exit;
/**
* Stock Reservation class.
*/
final class ReserveStock {
/**
* Is stock reservation enabled?
*
* @var boolean
*/
private $enabled = true;
/**
* Constructor
*/
public function __construct() {
// Table needed for this feature are added in 4.3.
$this->enabled = get_option( 'woocommerce_schema_version', 0 ) >= 430;
}
/**
* Is stock reservation enabled?
*
* @return boolean
*/
protected function is_enabled() {
return $this->enabled;
}
/**
* Query for any existing holds on stock for this item.
*
* @param \WC_Product $product Product to get reserved stock for.
* @param integer $exclude_order_id Optional order to exclude from the results.
*
* @return integer Amount of stock already reserved.
*/
public function get_reserved_stock( $product, $exclude_order_id = 0 ) {
global $wpdb;
if ( ! $this->is_enabled() ) {
return 0;
}
// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQL.NotPrepared
return (int) $wpdb->get_var( $this->get_query_for_reserved_stock( $product->get_stock_managed_by_id(), $exclude_order_id ) );
}
/**
* Put a temporary hold on stock for an order if enough is available.
*
* @throws ReserveStockException If stock cannot be reserved.
*
* @param \WC_Order $order Order object.
* @param int $minutes How long to reserve stock in minutes. Defaults to woocommerce_hold_stock_minutes.
*/
public function reserve_stock_for_order( $order, $minutes = 0 ) {
$minutes = $minutes ? $minutes : (int) get_option( 'woocommerce_hold_stock_minutes', 60 );
if ( ! $minutes || ! $this->is_enabled() ) {
return;
}
try {
$items = array_filter(
$order->get_items(),
function( $item ) {
return $item->is_type( 'line_item' ) && $item->get_product() instanceof \WC_Product && $item->get_quantity() > 0;
}
);
$rows = array();
foreach ( $items as $item ) {
$product = $item->get_product();
if ( ! $product->is_in_stock() ) {
throw new ReserveStockException(
'woocommerce_product_out_of_stock',
sprintf(
/* translators: %s: product name */
__( '"%s" is out of stock and cannot be purchased.', 'woocommerce' ),
$product->get_name()
),
403
);
}
// If stock management is off, no need to reserve any stock here.
if ( ! $product->managing_stock() || $product->backorders_allowed() ) {
continue;
}
$managed_by_id = $product->get_stock_managed_by_id();
/**
* Filter order item quantity.
*
* @param int|float $quantity Quantity.
* @param WC_Order $order Order data.
* @param WC_Order_Item_Product $item Order item data.
*/
$item_quantity = apply_filters( 'woocommerce_order_item_quantity', $item->get_quantity(), $order, $item );
$rows[ $managed_by_id ] = isset( $rows[ $managed_by_id ] ) ? $rows[ $managed_by_id ] + $item_quantity : $item_quantity;
}
if ( ! empty( $rows ) ) {
foreach ( $rows as $product_id => $quantity ) {
$this->reserve_stock_for_product( $product_id, $quantity, $order, $minutes );
}
}
} catch ( ReserveStockException $e ) {
$this->release_stock_for_order( $order );
throw $e;
}
}
/**
* Release a temporary hold on stock for an order.
*
* @param \WC_Order $order Order object.
*/
public function release_stock_for_order( $order ) {
global $wpdb;
if ( ! $this->is_enabled() ) {
return;
}
$wpdb->delete(
$wpdb->wc_reserved_stock,
array(
'order_id' => $order->get_id(),
)
);
}
/**
* Reserve stock for a product by inserting rows into the DB.
*
* @throws ReserveStockException If a row cannot be inserted.
*
* @param int $product_id Product ID which is having stock reserved.
* @param int $stock_quantity Stock amount to reserve.
* @param \WC_Order $order Order object which contains the product.
* @param int $minutes How long to reserve stock in minutes.
*/
private function reserve_stock_for_product( $product_id, $stock_quantity, $order, $minutes ) {
global $wpdb;
$product_data_store = \WC_Data_Store::load( 'product' );
$query_for_stock = $product_data_store->get_query_for_stock( $product_id );
$query_for_reserved_stock = $this->get_query_for_reserved_stock( $product_id, $order->get_id() );
// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQL.NotPrepared
$result = $wpdb->query(
$wpdb->prepare(
"
INSERT INTO {$wpdb->wc_reserved_stock} ( `order_id`, `product_id`, `stock_quantity`, `timestamp`, `expires` )
SELECT %d, %d, %d, NOW(), ( NOW() + INTERVAL %d MINUTE ) FROM DUAL
WHERE ( $query_for_stock FOR UPDATE ) - ( $query_for_reserved_stock FOR UPDATE ) >= %d
ON DUPLICATE KEY UPDATE `expires` = VALUES( `expires` ), `stock_quantity` = VALUES( `stock_quantity` )
",
$order->get_id(),
$product_id,
$stock_quantity,
$minutes,
$stock_quantity
)
);
// phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQL.NotPrepared
if ( ! $result ) {
$product = wc_get_product( $product_id );
throw new ReserveStockException(
'woocommerce_product_not_enough_stock',
sprintf(
/* translators: %s: product name */
__( 'Not enough units of %s are available in stock to fulfil this order.', 'woocommerce' ),
$product ? $product->get_name() : '#' . $product_id
),
403
);
}
}
/**
* Returns query statement for getting reserved stock of a product.
*
* @param int $product_id Product ID.
* @param integer $exclude_order_id Optional order to exclude from the results.
* @return string|void Query statement.
*/
private function get_query_for_reserved_stock( $product_id, $exclude_order_id = 0 ) {
global $wpdb;
$query = $wpdb->prepare(
"
SELECT COALESCE( SUM( stock_table.`stock_quantity` ), 0 ) FROM $wpdb->wc_reserved_stock stock_table
LEFT JOIN $wpdb->posts posts ON stock_table.`order_id` = posts.ID
WHERE posts.post_status IN ( 'wc-checkout-draft', 'wc-pending' )
AND stock_table.`expires` > NOW()
AND stock_table.`product_id` = %d
AND stock_table.`order_id` != %d
",
$product_id,
$exclude_order_id
);
/**
* Filter: woocommerce_query_for_reserved_stock
* Allows to filter the query for getting reserved stock of a product.
*
* @since 4.5.0
* @param string $query The query for getting reserved stock of a product.
* @param int $product_id Product ID.
* @param int $exclude_order_id Order to exclude from the results.
*/
return apply_filters( 'woocommerce_query_for_reserved_stock', $query, $product_id, $exclude_order_id );
}
}