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_EnableTransitGatewayRouteTablePropagation.go
    path of file: ./repos/aws-sdk-go-v2/service/ec2
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package ec2

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/ec2/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Enables the specified attachment to propagate routes to the specified
// propagation route table.
func (c *Client) EnableTransitGatewayRouteTablePropagation(ctx context.Context, params *EnableTransitGatewayRouteTablePropagationInput, optFns ...func(*Options)) (*EnableTransitGatewayRouteTablePropagationOutput, error) {
	if params == nil {
		params = &EnableTransitGatewayRouteTablePropagationInput{}
	}

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

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

type EnableTransitGatewayRouteTablePropagationInput struct {

	// The ID of the propagation route table.
	//
	// This member is required.
	TransitGatewayRouteTableId *string

	// Checks whether you have the required permissions for the action, without
	// actually making the request, and provides an error response. If you have the
	// required permissions, the error response is DryRunOperation . Otherwise, it is
	// UnauthorizedOperation .
	DryRun *bool

	// The ID of the attachment.
	TransitGatewayAttachmentId
    
func (c *Client) addOperationEnableTransitGatewayRouteTablePropagationMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsEc2query_serializeOpEnableTransitGatewayRouteTablePropagation{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsEc2query_deserializeOpEnableTransitGatewayRouteTablePropagation{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "EnableTransitGatewayRouteTablePropagation"); 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 = addOpEnableTransitGatewayRouteTablePropagationValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opEnableTransitGatewayRouteTablePropagation(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
}