You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: api_op_UpdatePublicDnsNamespace.go
    path of file: ./repos/aws-sdk-go-v2/service/servicediscovery
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package servicediscovery

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/servicediscovery/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Updates a public DNS namespace.
func (c *Client) UpdatePublicDnsNamespace(ctx context.Context, params *UpdatePublicDnsNamespaceInput, optFns ...func(*Options)) (*UpdatePublicDnsNamespaceOutput, error) {
	if params == nil {
		params = &UpdatePublicDnsNamespaceInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "UpdatePublicDnsNamespace", params, optFns, c.addOperationUpdatePublicDnsNamespaceMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*UpdatePublicDnsNamespaceOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type UpdatePublicDnsNamespaceInput struct {

	// The ID of the namespace being updated.
	//
	// This member is required.
	Id *string

	// Updated properties for the public DNS namespace.
	//
	// This member is required.
	Namespace *types.PublicDnsNamespaceChange

	// A unique string that identifies the request and that allows failed
	// UpdatePublicDnsNamespace requests to be retried without the risk of running the
	// oper
    
func (c *Client) addOperationUpdatePublicDnsNamespaceMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpUpdatePublicDnsNamespace{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpUpdatePublicDnsNamespace{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "UpdatePublicDnsNamespace"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addIdempotencyToken_opUpdatePublicDnsNamespaceMiddleware(stack, options); err != nil {
		return err
	}
	if err = addOpUpdatePublicDnsNamespaceValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opUpdatePublicDnsNamespace(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}