/**
 * Describe Spot Datafeed Subscription Action Sample
 * Describes the data feed for spot instances.  
 * @param Amazon_EC2_Interface $service instance of Amazon_EC2_Interface
 * @param mixed $request Amazon_EC2_Model_DescribeSpotDatafeedSubscription or array of parameters
 */
function invokeDescribeSpotDatafeedSubscription(Amazon_EC2_Interface $service, $request)
{
    try {
        $response = $service->describeSpotDatafeedSubscription($request);
        echo "Service Response\n";
        echo "=============================================================================\n";
        echo "        DescribeSpotDatafeedSubscriptionResponse\n";
        if ($response->isSetResponseMetadata()) {
            echo "            ResponseMetadata\n";
            $responseMetadata = $response->getResponseMetadata();
            if ($responseMetadata->isSetRequestId()) {
                echo "                RequestId\n";
                echo "                    " . $responseMetadata->getRequestId() . "\n";
            }
        }
        if ($response->isSetDescribeSpotDatafeedSubscriptionResult()) {
            echo "            DescribeSpotDatafeedSubscriptionResult\n";
            $describeSpotDatafeedSubscriptionResult = $response->getDescribeSpotDatafeedSubscriptionResult();
            if ($describeSpotDatafeedSubscriptionResult->isSetSpotDatafeedSubscription()) {
                echo "                SpotDatafeedSubscription\n";
                $spotDatafeedSubscription = $describeSpotDatafeedSubscriptionResult->getSpotDatafeedSubscription();
                if ($spotDatafeedSubscription->isSetOwnerId()) {
                    echo "                    OwnerId\n";
                    echo "                        " . $spotDatafeedSubscription->getOwnerId() . "\n";
                }
                if ($spotDatafeedSubscription->isSetBucket()) {
                    echo "                    Bucket\n";
                    echo "                        " . $spotDatafeedSubscription->getBucket() . "\n";
                }
                if ($spotDatafeedSubscription->isSetPrefix()) {
                    echo "                    Prefix\n";
                    echo "                        " . $spotDatafeedSubscription->getPrefix() . "\n";
                }
                if ($spotDatafeedSubscription->isSetState()) {
                    echo "                    State\n";
                    echo "                        " . $spotDatafeedSubscription->getState() . "\n";
                }
                if ($spotDatafeedSubscription->isSetFault()) {
                    echo "                    Fault\n";
                    $fault = $spotDatafeedSubscription->getFault();
                    if ($fault->isSetCode()) {
                        echo "                        Code\n";
                        echo "                            " . $fault->getCode() . "\n";
                    }
                    if ($fault->isSetMessage()) {
                        echo "                        Message\n";
                        echo "                            " . $fault->getMessage() . "\n";
                    }
                }
            }
        }
    } catch (Amazon_EC2_Exception $ex) {
        echo "Caught Exception: " . $ex->getMessage() . "\n";
        echo "Response Status Code: " . $ex->getStatusCode() . "\n";
        echo "Error Code: " . $ex->getErrorCode() . "\n";
        echo "Error Type: " . $ex->getErrorType() . "\n";
        echo "Request ID: " . $ex->getRequestId() . "\n";
        echo "XML: " . $ex->getXML() . "\n";
    }
}