How does the backend currency rates import work

dmitry_fedyuk · January 1, 2016, 5:31am

magento/magento2/blob/2.0.0/app/code/Magento/CurrencySymbol/Controller/Adminhtml/System/Currency/FetchRates.php#L36


if (!$service) {
    throw new LocalizedException(__('Please specify a correct Import Service.'));
}
try {
    /** @var \Magento\Directory\Model\Currency\Import\ImportInterface $importModel */
    $importModel = $this->_objectManager->get('Magento\Directory\Model\Currency\Import\Factory')
        ->create($service);
} catch (\Exception $e) {
    throw new LocalizedException(__('We can\'t initialize the import model.'));
}
$rates = $importModel->fetchRates();
$errors = $importModel->getMessages();
if (sizeof($errors) > 0) {
    foreach ($errors as $error) {
        $this->messageManager->addWarning($error);
    }
    $this->messageManager->addWarning(
        __('Click "Save" to apply the rates we found.')
    );
} else {
    $this->messageManager->addSuccess(__('Click "Save" to apply the rates we found.'));

github.com

magento/magento2/blob/2.0.0/app/code/Magento/Directory/Model/Currency/Import/AbstractImport.php#L108


    foreach ($defaultCurrencies as $currencyFrom) {
        if (!isset($data[$currencyFrom])) {
            $data[$currencyFrom] = [];
        }


        foreach ($currencies as $currencyTo) {
            if ($currencyFrom == $currencyTo) {
                $data[$currencyFrom][$currencyTo] = $this->_numberFormat(1);
            } else {
                $data[$currencyFrom][$currencyTo] = $this->_numberFormat(
                    $this->_convert($currencyFrom, $currencyTo)
                );
            }
        }
        ksort($data[$currencyFrom]);
    }


    return $data;
}


/**

github.com

magento/magento2/blob/2.0.0/app/code/Magento/Directory/Model/Currency/Import/Webservicex.php#L19-L19


const CURRENCY_CONVERTER_URL = 'http://www.webservicex.net/CurrencyConvertor.asmx/ConversionRate?FromCurrency={{CURRENCY_FROM}}&ToCurrency={{CURRENCY_TO}}';

github.com

magento/magento2/blob/2.0.0/app/code/Magento/Directory/Model/Currency/Import/Webservicex.php#L56-L57


$url = str_replace('{{CURRENCY_FROM}}', $currencyFrom, self::CURRENCY_CONVERTER_URL);
$url = str_replace('{{CURRENCY_TO}}', $currencyTo, $url);

github.com

magento/magento2/blob/2.0.0/app/code/Magento/Directory/Model/Currency/Import/Webservicex.php#L60-L78


$response = $this->_httpClient->setUri(
    $url
)->setConfig(
    [
        'timeout' => $this->_scopeConfig->getValue(
            'currency/webservicex/timeout',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        ),
    ]
)->request(
    'GET'
)->getBody();


$xml = simplexml_load_string($response, null, LIBXML_NOERROR);
if (!$xml) {
    $this->_messages[] = __('We can\'t retrieve a rate from %1.', $url);
    return null;
}
return (double)$xml;

github.com

magento/magento2/blob/2.0.0/app/code/Magento/CurrencySymbol/Controller/Adminhtml/System/Currency/FetchRates.php#L49


            foreach ($errors as $error) {
                $this->messageManager->addWarning($error);
            }
            $this->messageManager->addWarning(
                __('Click "Save" to apply the rates we found.')
            );
        } else {
            $this->messageManager->addSuccess(__('Click "Save" to apply the rates we found.'));
        }


        $backendSession->setRates($rates);
    } catch (\Exception $e) {
        $this->messageManager->addError($e->getMessage());
    }


    /** @var \Magento\Backend\Model\View\Result\Redirect $resultRedirect */
    $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
    return $resultRedirect->setPath('adminhtml/*/');
}
}

github.com

magento/magento2/blob/2.0.0/app/code/Magento/CurrencySymbol/Controller/Adminhtml/System/Currency/FetchRates.php#L56-L57


    return $resultRedirect->setPath('adminhtml/*/');
}

github.com

magento/magento2/blob/2.0.0/app/code/Magento/CurrencySymbol/Block/Adminhtml/System/Currency/Rate/Matrix.php#L47


    parent::__construct($context, $data);
}


/**
 * Prepare layout
 *
 * @return \Magento\Framework\View\Element\AbstractBlock
 */
protected function _prepareLayout()
{
    $newRates = $this->_backendSession->getRates();
    $this->_backendSession->unsetData('rates');


    $currencyModel = $this->_dirCurrencyFactory->create();
    $currencies = $currencyModel->getConfigAllowCurrencies();
    $defaultCurrencies = $currencyModel->getConfigBaseCurrencies();
    $oldCurrencies = $this->_prepareRates($currencyModel->getCurrencyRates($defaultCurrencies, $currencies));


    foreach ($currencies as $currency) {
        foreach ($oldCurrencies as $key => $value) {
            if (!array_key_exists($currency, $oldCurrencies[$key])) {

github.com

magento/magento2/blob/2.0.0/app/code/Magento/CurrencySymbol/Block/Adminhtml/System/Currency/Rate/Matrix.php#L69-L77


$this->setAllowedCurrencies(
    $currencies
)->setDefaultCurrencies(
    $defaultCurrencies
)->setOldRates(
    $oldCurrencies
)->setNewRates(
    $this->_prepareRates($newRates)
);

dmitry_fedyuk · January 1, 2016, 5:45am