/**
 * Describe Vpn Connections Action Sample
 * Gives you information about your VPN connections.
 * Important
 * We strongly recommend you use HTTPS when calling this operation because the
 * response contains sensitive cryptographic information for configuring your customer gateway.
 * You can filter the results to return information only about VPN connections
 * that match criteria you specify. For example, you could ask to get information
 * about a particular VPN connection (or all) only if the VPN's state is pending
 * or available. You can specify multiple filters (e.g., the VPN connection is
 * associated with a particular VPN gateway, and the gateway's state is
 * pending or available). The result includes information for a particular
 * VPN connection only if the VPN connection matches all your filters.
 * If there's no match, no special message is returned; the response is
 * simply empty.  
 * @param Amazon_EC2_Interface $service instance of Amazon_EC2_Interface
 * @param mixed $request Amazon_EC2_Model_DescribeVpnConnections or array of parameters
 */
function invokeDescribeVpnConnections(Amazon_EC2_Interface $service, $request)
{
    try {
        $response = $service->describeVpnConnections($request);
        echo "Service Response\n";
        echo "=============================================================================\n";
        echo "        DescribeVpnConnectionsResponse\n";
        if ($response->isSetResponseMetadata()) {
            echo "            ResponseMetadata\n";
            $responseMetadata = $response->getResponseMetadata();
            if ($responseMetadata->isSetRequestId()) {
                echo "                RequestId\n";
                echo "                    " . $responseMetadata->getRequestId() . "\n";
            }
        }
        if ($response->isSetDescribeVpnConnectionsResult()) {
            echo "            DescribeVpnConnectionsResult\n";
            $describeVpnConnectionsResult = $response->getDescribeVpnConnectionsResult();
            $vpnConnectionList = $describeVpnConnectionsResult->getVpnConnection();
            foreach ($vpnConnectionList as $vpnConnection) {
                echo "                VpnConnection\n";
                if ($vpnConnection->isSetVpnConnectionId()) {
                    echo "                    VpnConnectionId\n";
                    echo "                        " . $vpnConnection->getVpnConnectionId() . "\n";
                }
                if ($vpnConnection->isSetVpnConnectionState()) {
                    echo "                    VpnConnectionState\n";
                    echo "                        " . $vpnConnection->getVpnConnectionState() . "\n";
                }
                if ($vpnConnection->isSetCustomerGatewayConfiguration()) {
                    echo "                    CustomerGatewayConfiguration\n";
                    echo "                        " . $vpnConnection->getCustomerGatewayConfiguration() . "\n";
                }
                if ($vpnConnection->isSetType()) {
                    echo "                    Type\n";
                    echo "                        " . $vpnConnection->getType() . "\n";
                }
                if ($vpnConnection->isSetCustomerGatewayId()) {
                    echo "                    CustomerGatewayId\n";
                    echo "                        " . $vpnConnection->getCustomerGatewayId() . "\n";
                }
                if ($vpnConnection->isSetVpnGatewayId()) {
                    echo "                    VpnGatewayId\n";
                    echo "                        " . $vpnConnection->getVpnGatewayId() . "\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";
    }
}