PHP code example of shipsaas / never-throw

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

shipsaas / never-throw example snippets

use NeverThrow\SuccessResult;
use NeverThrow\ErrorResult;

// Success
class BookShipperOkResult extends SuccessResult
{
    public function __construct(
        public string $bookingId
    ) {}
}

enum BookingErrors {
    case NO_SHIPPER_AVAILABLE;
    case OVERWEIGHT_PACKAGE;
    case INVALID_ADDRESS;
}

// Error
class BookShipperErrorResult extends ErrorResult
{
    public function __construct(
        public BookingErrors $outcome
    ) {}
}

use NeverThrow\Result;

class BookShipperResult extends Result
{
    public function getOkResult(): BookShipperOkResult
    {
        return parent::getOkResult();
    }
    
    public function getErrorResult(): BookShipperErrorResult
    {
        return parent::getErrorResult();
    }
}

public function createBooking(User $user, BookingOrder $order): BookShipperResult
{
    $hasAnyShipperAvailable = $this->shipperService->hasAnyShipperAvailable();
    if (!$hasAnyShipperAvailable) {
        return new BookShipperResult(
            new BookShipperErrorResult(
                BookingErrors::NO_SHIPPER_AVAILABLE
            )
        );
    }
    
    $isOverweight = !$this->weightService->isValid($order);
    if ($isOverweight) {
        return new BookShipperResult(
            new BookShipperErrorResult(
                BookingErrors::OVERWEIGHT_PACKAGE
            )
        );
    }
    
    $bookingId = $this->book($user, $order);
   
    return new BookShipperResult(new BookShipperOkResult($bookingId));
}

$bookingResult = $this->service->createBooking($user, $order);

if ($bookingResult->isError()) {
    $errorResult = $bookingResult->getErrorResult();

    // handle error
    return showError(match ($errorResult->outcome) {
        BookingErrors::NO_SHIPPER_AVAILABLE => 'No shipper available at the moment. Please wait',
        BookingErrors::OVERWEIGHT_PACKAGE => 'Your package is overweight',
    });
}

return showBooking($bookingResult->getOkResult()->bookingId);

function transfer(): Transaction
{
    if (!$hasEnoughBalance) {
        thrown new InsufficientBalanceError();
    }
    
    if (!$invalidRecipient) {
        throw new InvalidRecipientError();
    }
    
    if (!$invalidMoney) {
        throw new InvalidTransferMoneyError();
    }
    
    $transaction = $this->transferService->transfer(...);
    if (!$transaction) {
        throw new TransferFailedError();
    }
    
    return $transaction;
}