/**
 * Revoke Security Group Ingress Action Sample
 * The RevokeSecurityGroupIngress operation revokes permissions from a security
 * group. The permissions used to revoke must be specified using the same values
 * used to grant the permissions.
 * Permissions are specified by IP protocol (TCP, UDP, or ICMP), the source of the
 * request (by IP range or an Amazon EC2 user-group pair), the source and
 * destination port ranges (for TCP and UDP), and the ICMP codes and types (for
 * ICMP).
 * Permission changes are quickly propagated to instances within the security
 * group. However, depending on the number of instances in the group, a small
 * delay is might occur, .
 * When revoking a user/group pair permission, GroupName, SourceSecurityGroupName
 * and SourceSecurityGroupOwnerId must be specified. When authorizing a CIDR IP
 * permission, GroupName, IpProtocol, FromPort, ToPort and CidrIp must be
 * specified. Mixing these two types of parameters is not allowed.
 *   
 * @param Amazon_EC2_Interface $service instance of Amazon_EC2_Interface
 * @param mixed $request Amazon_EC2_Model_RevokeSecurityGroupIngress or array of parameters
 */
function invokeRevokeSecurityGroupIngress(Amazon_EC2_Interface $service, $request)
{
    try {
        $response = $service->revokeSecurityGroupIngress($request);
        echo "Service Response\n";
        echo "=============================================================================\n";
        echo "        RevokeSecurityGroupIngressResponse\n";
        if ($response->isSetResponseMetadata()) {
            echo "            ResponseMetadata\n";
            $responseMetadata = $response->getResponseMetadata();
            if ($responseMetadata->isSetRequestId()) {
                echo "                RequestId\n";
                echo "                    " . $responseMetadata->getRequestId() . "\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";
    }
}