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

package ecr

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

// Returns the pull through cache rules for a registry.
func (c *Client) DescribePullThroughCacheRules(ctx context.Context, params *DescribePullThroughCacheRulesInput, optFns ...func(*Options)) (*DescribePullThroughCacheRulesOutput, error) {
	if params == nil {
		params = &DescribePullThroughCacheRulesInput{}
	}

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

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

type DescribePullThroughCacheRulesInput struct {

	// The Amazon ECR repository prefixes associated with the pull through cache rules
	// to return. If no repository prefix value is specified, all pull through cache
	// rules are returned.
	EcrRepositoryPrefixes []string

	// The maximum number of pull through cache rules returned by
	// DescribePullThroughCacheRulesRequest in paginated output. When this parameter is
	// used, DescribePullThroughCacheRulesRequest only returns maxResults results in a
	// single page along with a nextToken response element. The remaining results of
	// the initial request can be seen by sending another
	// DescribePullThroughCacheRulesRequest request 
    
func (c *Client) addOperationDescribePullThroughCacheRulesMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpDescribePullThroughCacheRules{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpDescribePullThroughCacheRules{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "DescribePullThroughCacheRules"); 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 = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribePullThroughCacheRules(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
}