/**
 * Describe Security Groups Action Sample
 * The DescribeSecurityGroups operation returns information about security groups
 * that you own.
 * If you specify security group names, information about those security group is
 * returned. Otherwise, information for all security group is returned. If you
 * specify a group that does not exist, a fault is returned.  
 * @param Amazon_EC2_Interface $service instance of Amazon_EC2_Interface
 * @param mixed $request Amazon_EC2_Model_DescribeSecurityGroups or array of parameters
 */
function invokeDescribeSecurityGroups(Amazon_EC2_Interface $service, $request)
{
    try {
        $response = $service->describeSecurityGroups($request);
        echo "Service Response\n";
        echo "=============================================================================\n";
        echo "        DescribeSecurityGroupsResponse\n";
        if ($response->isSetResponseMetadata()) {
            echo "            ResponseMetadata\n";
            $responseMetadata = $response->getResponseMetadata();
            if ($responseMetadata->isSetRequestId()) {
                echo "                RequestId\n";
                echo "                    " . $responseMetadata->getRequestId() . "\n";
            }
        }
        if ($response->isSetDescribeSecurityGroupsResult()) {
            echo "            DescribeSecurityGroupsResult\n";
            $describeSecurityGroupsResult = $response->getDescribeSecurityGroupsResult();
            $securityGroupList = $describeSecurityGroupsResult->getSecurityGroup();
            foreach ($securityGroupList as $securityGroup) {
                echo "                SecurityGroup\n";
                if ($securityGroup->isSetOwnerId()) {
                    echo "                    OwnerId\n";
                    echo "                        " . $securityGroup->getOwnerId() . "\n";
                }
                if ($securityGroup->isSetGroupName()) {
                    echo "                    GroupName\n";
                    echo "                        " . $securityGroup->getGroupName() . "\n";
                }
                if ($securityGroup->isSetGroupDescription()) {
                    echo "                    GroupDescription\n";
                    echo "                        " . $securityGroup->getGroupDescription() . "\n";
                }
                $ipPermissionList = $securityGroup->getIpPermission();
                foreach ($ipPermissionList as $ipPermission) {
                    echo "                    IpPermission\n";
                    if ($ipPermission->isSetIpProtocol()) {
                        echo "                        IpProtocol\n";
                        echo "                            " . $ipPermission->getIpProtocol() . "\n";
                    }
                    if ($ipPermission->isSetFromPort()) {
                        echo "                        FromPort\n";
                        echo "                            " . $ipPermission->getFromPort() . "\n";
                    }
                    if ($ipPermission->isSetToPort()) {
                        echo "                        ToPort\n";
                        echo "                            " . $ipPermission->getToPort() . "\n";
                    }
                    $userIdGroupPairList = $ipPermission->getUserIdGroupPair();
                    foreach ($userIdGroupPairList as $userIdGroupPair) {
                        echo "                        UserIdGroupPair\n";
                        if ($userIdGroupPair->isSetUserId()) {
                            echo "                            UserId\n";
                            echo "                                " . $userIdGroupPair->getUserId() . "\n";
                        }
                        if ($userIdGroupPair->isSetGroupName()) {
                            echo "                            GroupName\n";
                            echo "                                " . $userIdGroupPair->getGroupName() . "\n";
                        }
                    }
                    $ipRangeList = $ipPermission->getIpRange();
                    foreach ($ipRangeList as $ipRange) {
                        echo "                        IpRange\n";
                        echo "                            " . $ipRange;
                    }
                }
            }
        }
    } 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";
    }
}