/**
* @param CurrencyPair $currencyPair
* @return Rate
* @throws Exception
*/
public function fetchRate(CurrencyPair $currencyPair)
{
$providers = [$this->mainProvider => CurrencyRateProvider::getByName($this->mainProvider), $this->secondProvider => CurrencyRateProvider::getByName($this->secondProvider)];
if (count($providers) !== 2) {
throw new Exception('One of providers not found');
}
$rates = [];
/** @var CurrencyRateProvider $provider */
foreach ($providers as $name => $provider) {
if (null === $provider) {
throw new Exception("Provider \"{$name}\" not found!");
}
try {
$providerHandler = $provider->getImplementationInstance($this->httpAdapter);
if ($providerHandler !== null) {
$swap = new Swap($providerHandler);
$rate = $swap->quote($currencyPair->getBaseCurrency() . '/' . $currencyPair->getQuoteCurrency())->getValue();
$rates[] = floatval($rate);
} else {
throw new Exception('Provider "' . $provider->name . '" not found');
}
} catch (\Exception $e) {
throw new Exception('One or more currency providers did not return result');
}
}
$min = min($rates);
$max = max($rates);
return new Rate($max - $min >= $max * $this->criticalDifference / 100 ? $max : $rates[0], new \DateTime());
}
/**
* Relation to CurrencyRateProvider model
*
* @return CurrencyRateProvider
*/
public function getRateProvider()
{
return CurrencyRateProvider::getByName($this->currency_rate_provider_name);
}
