/
api_op_ListFaces.go
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/
api_op_ListFaces.go
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// Code generated by smithy-go-codegen DO NOT EDIT.
package rekognition
import (
"context"
"fmt"
awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
"github.com/aws/aws-sdk-go-v2/service/rekognition/types"
"github.com/aws/smithy-go/middleware"
smithyhttp "github.com/aws/smithy-go/transport/http"
)
// Returns metadata for faces in the specified collection. This metadata includes
// information such as the bounding box coordinates, the confidence (that the
// bounding box contains a face), and face ID. For an example, see Listing Faces in
// a Collection in the Amazon Rekognition Developer Guide. This operation requires
// permissions to perform the rekognition:ListFaces action.
func (c *Client) ListFaces(ctx context.Context, params *ListFacesInput, optFns ...func(*Options)) (*ListFacesOutput, error) {
if params == nil {
params = &ListFacesInput{}
}
result, metadata, err := c.invokeOperation(ctx, "ListFaces", params, optFns, addOperationListFacesMiddlewares)
if err != nil {
return nil, err
}
out := result.(*ListFacesOutput)
out.ResultMetadata = metadata
return out, nil
}
type ListFacesInput struct {
// ID of the collection from which to list the faces.
//
// This member is required.
CollectionId *string
// Maximum number of faces to return.
MaxResults *int32
// If the previous response was incomplete (because there is more data to
// retrieve), Amazon Rekognition returns a pagination token in the response. You
// can use this pagination token to retrieve the next set of faces.
NextToken *string
}
type ListFacesOutput struct {
// Version number of the face detection model associated with the input collection
// (CollectionId).
FaceModelVersion *string
// An array of Face objects.
Faces []types.Face
// If the response is truncated, Amazon Rekognition returns this token that you can
// use in the subsequent request to retrieve the next set of faces.
NextToken *string
// Metadata pertaining to the operation's result.
ResultMetadata middleware.Metadata
}
func addOperationListFacesMiddlewares(stack *middleware.Stack, options Options) (err error) {
err = stack.Serialize.Add(&awsAwsjson11_serializeOpListFaces{}, middleware.After)
if err != nil {
return err
}
err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpListFaces{}, middleware.After)
if err != nil {
return err
}
if err = addSetLoggerMiddleware(stack, options); err != nil {
return err
}
if err = awsmiddleware.AddClientRequestIDMiddleware(stack); err != nil {
return err
}
if err = smithyhttp.AddComputeContentLengthMiddleware(stack); err != nil {
return err
}
if err = addResolveEndpointMiddleware(stack, options); err != nil {
return err
}
if err = v4.AddComputePayloadSHA256Middleware(stack); err != nil {
return err
}
if err = addRetryMiddlewares(stack, options); err != nil {
return err
}
if err = addHTTPSignerV4Middleware(stack, options); err != nil {
return err
}
if err = awsmiddleware.AddRawResponseToMetadata(stack); err != nil {
return err
}
if err = awsmiddleware.AddRecordResponseTiming(stack); err != nil {
return err
}
if err = addClientUserAgent(stack); err != nil {
return err
}
if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
return err
}
if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
return err
}
if err = addOpListFacesValidationMiddleware(stack); err != nil {
return err
}
if err = stack.Initialize.Add(newServiceMetadataMiddleware_opListFaces(options.Region), middleware.Before); 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
}
return nil
}
// ListFacesAPIClient is a client that implements the ListFaces operation.
type ListFacesAPIClient interface {
ListFaces(context.Context, *ListFacesInput, ...func(*Options)) (*ListFacesOutput, error)
}
var _ ListFacesAPIClient = (*Client)(nil)
// ListFacesPaginatorOptions is the paginator options for ListFaces
type ListFacesPaginatorOptions struct {
// Maximum number of faces to return.
Limit int32
// Set to true if pagination should stop if the service returns a pagination token
// that matches the most recent token provided to the service.
StopOnDuplicateToken bool
}
// ListFacesPaginator is a paginator for ListFaces
type ListFacesPaginator struct {
options ListFacesPaginatorOptions
client ListFacesAPIClient
params *ListFacesInput
nextToken *string
firstPage bool
}
// NewListFacesPaginator returns a new ListFacesPaginator
func NewListFacesPaginator(client ListFacesAPIClient, params *ListFacesInput, optFns ...func(*ListFacesPaginatorOptions)) *ListFacesPaginator {
options := ListFacesPaginatorOptions{}
if params.MaxResults != nil {
options.Limit = *params.MaxResults
}
for _, fn := range optFns {
fn(&options)
}
if params == nil {
params = &ListFacesInput{}
}
return &ListFacesPaginator{
options: options,
client: client,
params: params,
firstPage: true,
}
}
// HasMorePages returns a boolean indicating whether more pages are available
func (p *ListFacesPaginator) HasMorePages() bool {
return p.firstPage || p.nextToken != nil
}
// NextPage retrieves the next ListFaces page.
func (p *ListFacesPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*ListFacesOutput, error) {
if !p.HasMorePages() {
return nil, fmt.Errorf("no more pages available")
}
params := *p.params
params.NextToken = p.nextToken
var limit *int32
if p.options.Limit > 0 {
limit = &p.options.Limit
}
params.MaxResults = limit
result, err := p.client.ListFaces(ctx, ¶ms, optFns...)
if err != nil {
return nil, err
}
p.firstPage = false
prevToken := p.nextToken
p.nextToken = result.NextToken
if p.options.StopOnDuplicateToken && prevToken != nil && p.nextToken != nil && *prevToken == *p.nextToken {
p.nextToken = nil
}
return result, nil
}
func newServiceMetadataMiddleware_opListFaces(region string) *awsmiddleware.RegisterServiceMetadata {
return &awsmiddleware.RegisterServiceMetadata{
Region: region,
ServiceID: ServiceID,
SigningName: "rekognition",
OperationName: "ListFaces",
}
}