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_CreateGateway.go
    path of file: ./repos/aws-sdk-go-v2/service/mediaconnect
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package mediaconnect

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

// Creates a new gateway. The request must include at least one network (up to 4).
func (c *Client) CreateGateway(ctx context.Context, params *CreateGatewayInput, optFns ...func(*Options)) (*CreateGatewayOutput, error) {
	if params == nil {
		params = &CreateGatewayInput{}
	}

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

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

// Creates a new gateway. The request must include at least one network (up to 4).
type CreateGatewayInput struct {

	// The range of IP addresses that are allowed to contribute content or initiate
	// output requests for flows communicating with this gateway. These IP addresses
	// should be in the form of a Classless Inter-Domain Routing (CIDR) block; for
	// example, 10.0.0.0/16.
	//
	// This member is required.
	EgressCidrBlocks []string

	// The name of the gateway. This name can not be modified after the gateway is
	// created.
	//
	// This member is required.
	Name *string

	// The list of networks that you want to add.
	//
	// This member is required.
	Networks []types.GatewayNetwork

	noSmithyDocumentSerde
}

type CreateGatewayOutput struct {

	// Th
    
func (c *Client) addOperationCreateGatewayMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsRestjson1_serializeOpCreateGateway{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestjson1_deserializeOpCreateGateway{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "CreateGateway"); 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 = addOpCreateGatewayValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opCreateGateway(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
}