api_op_DescribeImages.go

// Code generated by smithy-go-codegen DO NOT EDIT.

package ec2

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

// Describes the specified images (AMIs, AKIs, and ARIs) available to you or all
// of the images available to you.
//
// The images available to you include public images, private images that you own,
// and private images owned by other Amazon Web Services accounts for which you
// have explicit launch permissions.
//
// Recently deregistered images appear in the returned results for a short
// interval and then return empty results. After all instances that reference a
// deregistered AMI are terminated, specifying the ID of the image will eventually
// return an error indicating that the AMI ID cannot be found.
//
// We strongly recommend using only paginated requests. Unpaginated requests are
// susceptible to throttling and timeouts.
//
// The order of the elements in the response, including those within nested
// structures, might vary. Applications should not assume the elements appear in a
// particular order.
func (c *Client) DescribeImages(ctx context.Context, params *DescribeImagesInput, optFns ...func(*Options)) (*DescribeImagesOutput, error) {
	if params == nil {
		params = &DescribeImagesInput{}
	}

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

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

type DescribeImagesInput struct {

	// 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

	// Scopes the images by users with explicit launch permissions. Specify an Amazon
	// Web Services account ID, self (the sender of the request), or all (public AMIs).
	//
	//   - If you specify an Amazon Web Services account ID that is not your own, only
	//   AMIs shared with that specific Amazon Web Services account ID are returned.
	//   However, AMIs that are shared with the account’s organization or organizational
	//   unit (OU) are not returned.
	//
	//   - If you specify self or your own Amazon Web Services account ID, AMIs shared
	//   with your account are returned. In addition, AMIs that are shared with the
	//   organization or OU of which you are member are also returned.
	//
	//   - If you specify all , all public AMIs are returned.
	ExecutableUsers []string

	// The filters.
	//
	//   - architecture - The image architecture ( i386 | x86_64 | arm64 | x86_64_mac |
	//   arm64_mac ).
	//
	//   - block-device-mapping.delete-on-termination - A Boolean value that indicates
	//   whether the Amazon EBS volume is deleted on instance termination.
	//
	//   - block-device-mapping.device-name - The device name specified in the block
	//   device mapping (for example, /dev/sdh or xvdh ).
	//
	//   - block-device-mapping.snapshot-id - The ID of the snapshot used for the
	//   Amazon EBS volume.
	//
	//   - block-device-mapping.volume-size - The volume size of the Amazon EBS volume,
	//   in GiB.
	//
	//   - block-device-mapping.volume-type - The volume type of the Amazon EBS volume (
	//   io1 | io2 | gp2 | gp3 | sc1 | st1 | standard ).
	//
	//   - block-device-mapping.encrypted - A Boolean that indicates whether the Amazon
	//   EBS volume is encrypted.
	//
	//   - creation-date - The time when the image was created, in the ISO 8601 format
	//   in the UTC time zone (YYYY-MM-DDThh:mm:ss.sssZ), for example,
	//   2021-09-29T11:04:43.305Z . You can use a wildcard ( * ), for example,
	//   2021-09-29T* , which matches an entire day.
	//
	//   - description - The description of the image (provided during image creation).
	//
	//   - ena-support - A Boolean that indicates whether enhanced networking with ENA
	//   is enabled.
	//
	//   - hypervisor - The hypervisor type ( ovm | xen ).
	//
	//   - image-id - The ID of the image.
	//
	//   - image-type - The image type ( machine | kernel | ramdisk ).
	//
	//   - is-public - A Boolean that indicates whether the image is public.
	//
	//   - kernel-id - The kernel ID.
	//
	//   - manifest-location - The location of the image manifest.
	//
	//   - name - The name of the AMI (provided during image creation).
	//
	//   - owner-alias - The owner alias ( amazon | aws-marketplace ). The valid
	//   aliases are defined in an Amazon-maintained list. This is not the Amazon Web
	//   Services account alias that can be set using the IAM console. We recommend that
	//   you use the Owner request parameter instead of this filter.
	//
	//   - owner-id - The Amazon Web Services account ID of the owner. We recommend
	//   that you use the Owner request parameter instead of this filter.
	//
	//   - platform - The platform. The only supported value is windows .
	//
	//   - product-code - The product code.
	//
	//   - product-code.type - The type of the product code ( marketplace ).
	//
	//   - ramdisk-id - The RAM disk ID.
	//
	//   - root-device-name - The device name of the root device volume (for example,
	//   /dev/sda1 ).
	//
	//   - root-device-type - The type of the root device volume ( ebs | instance-store
	//   ).
	//
	//   - source-instance-id - The ID of the instance that the AMI was created from if
	//   the AMI was created using CreateImage. This filter is applicable only if the AMI
	//   was created using [CreateImage].
	//
	//   - state - The state of the image ( available | pending | failed ).
	//
	//   - state-reason-code - The reason code for the state change.
	//
	//   - state-reason-message - The message for the state change.
	//
	//   - sriov-net-support - A value of simple indicates that enhanced networking
	//   with the Intel 82599 VF interface is enabled.
	//
	//   - tag : - The key/value combination of a tag assigned to the resource. Use the
	//   tag key in the filter name and the tag value as the filter value. For example,
	//   to find all resources that have a tag with the key Owner and the value TeamA ,
	//   specify tag:Owner for the filter name and TeamA for the filter value.
	//
	//   - tag-key - The key of a tag assigned to the resource. Use this filter to find
	//   all resources assigned a tag with a specific key, regardless of the tag value.
	//
	//   - virtualization-type - The virtualization type ( paravirtual | hvm ).
	//
	// [CreateImage]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateImage.html
	Filters []types.Filter

	// The image IDs.
	//
	// Default: Describes all images available to you.
	ImageIds []string

	// Specifies whether to include deprecated AMIs.
	//
	// Default: No deprecated AMIs are included in the response.
	//
	// If you are the AMI owner, all deprecated AMIs appear in the response regardless
	// of what you specify for this parameter.
	IncludeDeprecated *bool

	// Specifies whether to include disabled AMIs.
	//
	// Default: No disabled AMIs are included in the response.
	IncludeDisabled *bool

	// The maximum number of items to return for this request. To get the next page of
	// items, make another request with the token returned in the output. For more
	// information, see [Pagination].
	//
	// [Pagination]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html#api-pagination
	MaxResults *int32

	// The token returned from a previous paginated request. Pagination continues from
	// the end of the items returned by the previous request.
	NextToken *string

	// Scopes the results to images with the specified owners. You can specify a
	// combination of Amazon Web Services account IDs, self , amazon , and
	// aws-marketplace . If you omit this parameter, the results include all images for
	// which you have launch permissions, regardless of ownership.
	Owners []string

	noSmithyDocumentSerde
}

type DescribeImagesOutput struct {

	// Information about the images.
	Images []types.Image

	// The token to include in another request to get the next page of items. This
	// value is null when there are no more items to return.
	NextToken *string

	// Metadata pertaining to the operation's result.
	ResultMetadata middleware.Metadata

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeImagesMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsEc2query_serializeOpDescribeImages{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsEc2query_deserializeOpDescribeImages{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "DescribeImages"); 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 = addSpanRetryLoop(stack, options); 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 = addTimeOffsetBuild(stack, c); err != nil {
		return err
	}
	if err = addUserAgentRetryMode(stack, options); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeImages(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
	}
	if err = addSpanInitializeStart(stack); err != nil {
		return err
	}
	if err = addSpanInitializeEnd(stack); err != nil {
		return err
	}
	if err = addSpanBuildRequestStart(stack); err != nil {
		return err
	}
	if err = addSpanBuildRequestEnd(stack); err != nil {
		return err
	}
	return nil
}

// ImageAvailableWaiterOptions are waiter options for ImageAvailableWaiter
type ImageAvailableWaiterOptions struct {

	// Set of options to modify how an operation is invoked. These apply to all
	// operations invoked for this client. Use functional options on operation call to
	// modify this list for per operation behavior.
	//
	// Passing options here is functionally equivalent to passing values to this
	// config's ClientOptions field that extend the inner client's APIOptions directly.
	APIOptions []func(*middleware.Stack) error

	// Functional options to be passed to all operations invoked by this client.
	//
	// Function values that modify the inner APIOptions are applied after the waiter
	// config's own APIOptions modifiers.
	ClientOptions []func(*Options)

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// ImageAvailableWaiter will use default minimum delay of 15 seconds. Note that
	// MinDelay must resolve to a value lesser than or equal to the MaxDelay.
	MinDelay time.Duration

	// MaxDelay is the maximum amount of time to delay between retries. If unset or
	// set to zero, ImageAvailableWaiter will use default max delay of 120 seconds.
	// Note that MaxDelay must resolve to value greater than or equal to the MinDelay.
	MaxDelay time.Duration

	// LogWaitAttempts is used to enable logging for waiter retry attempts
	LogWaitAttempts bool

	// Retryable is function that can be used to override the service defined
	// waiter-behavior based on operation output, or returned error. This function is
	// used by the waiter to decide if a state is retryable or a terminal state.
	//
	// By default service-modeled logic will populate this option. This option can
	// thus be used to define a custom waiter state with fall-back to service-modeled
	// waiter state mutators.The function returns an error in case of a failure state.
	// In case of retry state, this function returns a bool value of true and nil
	// error, while in case of success it returns a bool value of false and nil error.
	Retryable func(context.Context, *DescribeImagesInput, *DescribeImagesOutput, error) (bool, error)
}

// ImageAvailableWaiter defines the waiters for ImageAvailable
type ImageAvailableWaiter struct {
	client DescribeImagesAPIClient

	options ImageAvailableWaiterOptions
}

// NewImageAvailableWaiter constructs a ImageAvailableWaiter.
func NewImageAvailableWaiter(client DescribeImagesAPIClient, optFns ...func(*ImageAvailableWaiterOptions)) *ImageAvailableWaiter {
	options := ImageAvailableWaiterOptions{}
	options.MinDelay = 15 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = imageAvailableStateRetryable

	for _, fn := range optFns {
		fn(&options)
	}
	return &ImageAvailableWaiter{
		client:  client,
		options: options,
	}
}

// Wait calls the waiter function for ImageAvailable waiter. The maxWaitDur is the
// maximum wait duration the waiter will wait. The maxWaitDur is required and must
// be greater than zero.
func (w *ImageAvailableWaiter) Wait(ctx context.Context, params *DescribeImagesInput, maxWaitDur time.Duration, optFns ...func(*ImageAvailableWaiterOptions)) error {
	_, err := w.WaitForOutput(ctx, params, maxWaitDur, optFns...)
	return err
}

// WaitForOutput calls the waiter function for ImageAvailable waiter and returns
// the output of the successful operation. The maxWaitDur is the maximum wait
// duration the waiter will wait. The maxWaitDur is required and must be greater
// than zero.
func (w *ImageAvailableWaiter) WaitForOutput(ctx context.Context, params *DescribeImagesInput, maxWaitDur time.Duration, optFns ...func(*ImageAvailableWaiterOptions)) (*DescribeImagesOutput, error) {
	if maxWaitDur <= 0 {
		return nil, fmt.Errorf("maximum wait time for waiter must be greater than zero")
	}

	options := w.options
	for _, fn := range optFns {
		fn(&options)
	}

	if options.MaxDelay <= 0 {
		options.MaxDelay = 120 * time.Second
	}

	if options.MinDelay > options.MaxDelay {
		return nil, fmt.Errorf("minimum waiter delay %v must be lesser than or equal to maximum waiter delay of %v.", options.MinDelay, options.MaxDelay)
	}

	ctx, cancelFn := context.WithTimeout(ctx, maxWaitDur)
	defer cancelFn()

	logger := smithywaiter.Logger{}
	remainingTime := maxWaitDur

	var attempt int64
	for {

		attempt++
		apiOptions := options.APIOptions
		start := time.Now()

		if options.LogWaitAttempts {
			logger.Attempt = attempt
			apiOptions = append([]func(*middleware.Stack) error{}, options.APIOptions...)
			apiOptions = append(apiOptions, logger.AddLogger)
		}

		out, err := w.client.DescribeImages(ctx, params, func(o *Options) {
			baseOpts := []func(*Options){
				addIsWaiterUserAgent,
			}
			o.APIOptions = append(o.APIOptions, apiOptions...)
			for _, opt := range baseOpts {
				opt(o)
			}
			for _, opt := range options.ClientOptions {
				opt(o)
			}
		})

		retryable, err := options.Retryable(ctx, params, out, err)
		if err != nil {
			return nil, err
		}
		if !retryable {
			return out, nil
		}

		remainingTime -= time.Since(start)
		if remainingTime < options.MinDelay || remainingTime <= 0 {
			break
		}

		// compute exponential backoff between waiter retries
		delay, err := smithywaiter.ComputeDelay(
			attempt, options.MinDelay, options.MaxDelay, remainingTime,
		)
		if err != nil {
			return nil, fmt.Errorf("error computing waiter delay, %w", err)
		}

		remainingTime -= delay
		// sleep for the delay amount before invoking a request
		if err := smithytime.SleepWithContext(ctx, delay); err != nil {
			return nil, fmt.Errorf("request cancelled while waiting, %w", err)
		}
	}
	return nil, fmt.Errorf("exceeded max wait time for ImageAvailable waiter")
}

func imageAvailableStateRetryable(ctx context.Context, input *DescribeImagesInput, output *DescribeImagesOutput, err error) (bool, error) {

	if err == nil {
		v1 := output.Images
		var v2 []types.ImageState
		for _, v := range v1 {
			v3 := v.State
			v2 = append(v2, v3)
		}
		expectedValue := "available"
		match := len(v2) > 0
		for _, v := range v2 {
			if string(v) != expectedValue {
				match = false
				break
			}
		}

		if match {
			return false, nil
		}
	}

	if err == nil {
		v1 := output.Images
		var v2 []types.ImageState
		for _, v := range v1 {
			v3 := v.State
			v2 = append(v2, v3)
		}
		expectedValue := "failed"
		var match bool
		for _, v := range v2 {
			if string(v) == expectedValue {
				match = true
				break
			}
		}

		if match {
			return false, fmt.Errorf("waiter state transitioned to Failure")
		}
	}

	return true, nil
}

// ImageExistsWaiterOptions are waiter options for ImageExistsWaiter
type ImageExistsWaiterOptions struct {

	// Set of options to modify how an operation is invoked. These apply to all
	// operations invoked for this client. Use functional options on operation call to
	// modify this list for per operation behavior.
	//
	// Passing options here is functionally equivalent to passing values to this
	// config's ClientOptions field that extend the inner client's APIOptions directly.
	APIOptions []func(*middleware.Stack) error

	// Functional options to be passed to all operations invoked by this client.
	//
	// Function values that modify the inner APIOptions are applied after the waiter
	// config's own APIOptions modifiers.
	ClientOptions []func(*Options)

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// ImageExistsWaiter will use default minimum delay of 15 seconds. Note that
	// MinDelay must resolve to a value lesser than or equal to the MaxDelay.
	MinDelay time.Duration

	// MaxDelay is the maximum amount of time to delay between retries. If unset or
	// set to zero, ImageExistsWaiter will use default max delay of 120 seconds. Note
	// that MaxDelay must resolve to value greater than or equal to the MinDelay.
	MaxDelay time.Duration

	// LogWaitAttempts is used to enable logging for waiter retry attempts
	LogWaitAttempts bool

	// Retryable is function that can be used to override the service defined
	// waiter-behavior based on operation output, or returned error. This function is
	// used by the waiter to decide if a state is retryable or a terminal state.
	//
	// By default service-modeled logic will populate this option. This option can
	// thus be used to define a custom waiter state with fall-back to service-modeled
	// waiter state mutators.The function returns an error in case of a failure state.
	// In case of retry state, this function returns a bool value of true and nil
	// error, while in case of success it returns a bool value of false and nil error.
	Retryable func(context.Context, *DescribeImagesInput, *DescribeImagesOutput, error) (bool, error)
}

// ImageExistsWaiter defines the waiters for ImageExists
type ImageExistsWaiter struct {
	client DescribeImagesAPIClient

	options ImageExistsWaiterOptions
}

// NewImageExistsWaiter constructs a ImageExistsWaiter.
func NewImageExistsWaiter(client DescribeImagesAPIClient, optFns ...func(*ImageExistsWaiterOptions)) *ImageExistsWaiter {
	options := ImageExistsWaiterOptions{}
	options.MinDelay = 15 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = imageExistsStateRetryable

	for _, fn := range optFns {
		fn(&options)
	}
	return &ImageExistsWaiter{
		client:  client,
		options: options,
	}
}

// Wait calls the waiter function for ImageExists waiter. The maxWaitDur is the
// maximum wait duration the waiter will wait. The maxWaitDur is required and must
// be greater than zero.
func (w *ImageExistsWaiter) Wait(ctx context.Context, params *DescribeImagesInput, maxWaitDur time.Duration, optFns ...func(*ImageExistsWaiterOptions)) error {
	_, err := w.WaitForOutput(ctx, params, maxWaitDur, optFns...)
	return err
}

// WaitForOutput calls the waiter function for ImageExists waiter and returns the
// output of the successful operation. The maxWaitDur is the maximum wait duration
// the waiter will wait. The maxWaitDur is required and must be greater than zero.
func (w *ImageExistsWaiter) WaitForOutput(ctx context.Context, params *DescribeImagesInput, maxWaitDur time.Duration, optFns ...func(*ImageExistsWaiterOptions)) (*DescribeImagesOutput, error) {
	if maxWaitDur <= 0 {
		return nil, fmt.Errorf("maximum wait time for waiter must be greater than zero")
	}

	options := w.options
	for _, fn := range optFns {
		fn(&options)
	}

	if options.MaxDelay <= 0 {
		options.MaxDelay = 120 * time.Second
	}

	if options.MinDelay > options.MaxDelay {
		return nil, fmt.Errorf("minimum waiter delay %v must be lesser than or equal to maximum waiter delay of %v.", options.MinDelay, options.MaxDelay)
	}

	ctx, cancelFn := context.WithTimeout(ctx, maxWaitDur)
	defer cancelFn()

	logger := smithywaiter.Logger{}
	remainingTime := maxWaitDur

	var attempt int64
	for {

		attempt++
		apiOptions := options.APIOptions
		start := time.Now()

		if options.LogWaitAttempts {
			logger.Attempt = attempt
			apiOptions = append([]func(*middleware.Stack) error{}, options.APIOptions...)
			apiOptions = append(apiOptions, logger.AddLogger)
		}

		out, err := w.client.DescribeImages(ctx, params, func(o *Options) {
			baseOpts := []func(*Options){
				addIsWaiterUserAgent,
			}
			o.APIOptions = append(o.APIOptions, apiOptions...)
			for _, opt := range baseOpts {
				opt(o)
			}
			for _, opt := range options.ClientOptions {
				opt(o)
			}
		})

		retryable, err := options.Retryable(ctx, params, out, err)
		if err != nil {
			return nil, err
		}
		if !retryable {
			return out, nil
		}

		remainingTime -= time.Since(start)
		if remainingTime < options.MinDelay || remainingTime <= 0 {
			break
		}

		// compute exponential backoff between waiter retries
		delay, err := smithywaiter.ComputeDelay(
			attempt, options.MinDelay, options.MaxDelay, remainingTime,
		)
		if err != nil {
			return nil, fmt.Errorf("error computing waiter delay, %w", err)
		}

		remainingTime -= delay
		// sleep for the delay amount before invoking a request
		if err := smithytime.SleepWithContext(ctx, delay); err != nil {
			return nil, fmt.Errorf("request cancelled while waiting, %w", err)
		}
	}
	return nil, fmt.Errorf("exceeded max wait time for ImageExists waiter")
}

func imageExistsStateRetryable(ctx context.Context, input *DescribeImagesInput, output *DescribeImagesOutput, err error) (bool, error) {

	if err == nil {
		v1 := output.Images
		v2 := len(v1)
		v3 := 0
		v4 := int64(v2) > int64(v3)
		expectedValue := "true"
		bv, err := strconv.ParseBool(expectedValue)
		if err != nil {
			return false, fmt.Errorf("error parsing boolean from string %w", err)
		}
		if v4 == bv {
			return false, nil
		}
	}

	if err != nil {
		var apiErr smithy.APIError
		ok := errors.As(err, &apiErr)
		if !ok {
			return false, fmt.Errorf("expected err to be of type smithy.APIError, got %w", err)
		}

		if "InvalidAMIID.NotFound" == apiErr.ErrorCode() {
			return true, nil
		}
	}

	return true, nil
}

// DescribeImagesPaginatorOptions is the paginator options for DescribeImages
type DescribeImagesPaginatorOptions struct {
	// The maximum number of items to return for this request. To get the next page of
	// items, make another request with the token returned in the output. For more
	// information, see [Pagination].
	//
	// [Pagination]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html#api-pagination
	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
}

// DescribeImagesPaginator is a paginator for DescribeImages
type DescribeImagesPaginator struct {
	options   DescribeImagesPaginatorOptions
	client    DescribeImagesAPIClient
	params    *DescribeImagesInput
	nextToken *string
	firstPage bool
}

// NewDescribeImagesPaginator returns a new DescribeImagesPaginator
func NewDescribeImagesPaginator(client DescribeImagesAPIClient, params *DescribeImagesInput, optFns ...func(*DescribeImagesPaginatorOptions)) *DescribeImagesPaginator {
	if params == nil {
		params = &DescribeImagesInput{}
	}

	options := DescribeImagesPaginatorOptions{}
	if params.MaxResults != nil {
		options.Limit = *params.MaxResults
	}

	for _, fn := range optFns {
		fn(&options)
	}

	return &DescribeImagesPaginator{
		options:   options,
		client:    client,
		params:    params,
		firstPage: true,
		nextToken: params.NextToken,
	}
}

// HasMorePages returns a boolean indicating whether more pages are available
func (p *DescribeImagesPaginator) HasMorePages() bool {
	return p.firstPage || (p.nextToken != nil && len(*p.nextToken) != 0)
}

// NextPage retrieves the next DescribeImages page.
func (p *DescribeImagesPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*DescribeImagesOutput, 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

	optFns = append([]func(*Options){
		addIsPaginatorUserAgent,
	}, optFns...)
	result, err := p.client.DescribeImages(ctx, &params, 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
}

// DescribeImagesAPIClient is a client that implements the DescribeImages
// operation.
type DescribeImagesAPIClient interface {
	DescribeImages(context.Context, *DescribeImagesInput, ...func(*Options)) (*DescribeImagesOutput, error)
}

var _ DescribeImagesAPIClient = (*Client)(nil)

func newServiceMetadataMiddleware_opDescribeImages(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		OperationName: "DescribeImages",
	}
}