s3 cache client-side support

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/adaptive.go

@@ -0,0 +1,156 @@
+package retry
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/internal/sdk"
+)
+
+const (
+	// DefaultRequestCost is the cost of a single request from the adaptive
+	// rate limited token bucket.
+	DefaultRequestCost uint = 1
+)
+
+// DefaultThrottles provides the set of errors considered throttle errors that
+// are checked by default.
+var DefaultThrottles = []IsErrorThrottle{
+	ThrottleErrorCode{
+		Codes: DefaultThrottleErrorCodes,
+	},
+}
+
+// AdaptiveModeOptions provides the functional options for configuring the
+// adaptive retry mode, and delay behavior.
+type AdaptiveModeOptions struct {
+	// If the adaptive token bucket is empty, when an attempt will be made
+	// AdaptiveMode will sleep until a token is available. This can occur when
+	// attempts fail with throttle errors. Use this option to disable the sleep
+	// until token is available, and return error immediately.
+	FailOnNoAttemptTokens bool
+
+	// The cost of an attempt from the AdaptiveMode's adaptive token bucket.
+	RequestCost uint
+
+	// Set of strategies to determine if the attempt failed due to a throttle
+	// error.
+	//
+	// It is safe to append to this list in NewAdaptiveMode's functional options.
+	Throttles []IsErrorThrottle
+
+	// Set of options for standard retry mode that AdaptiveMode is built on top
+	// of. AdaptiveMode may apply its own defaults to Standard retry mode that
+	// are different than the defaults of NewStandard. Use these options to
+	// override the default options.
+	StandardOptions []func(*StandardOptions)
+}
+
+// AdaptiveMode provides an experimental retry strategy that expands on the
+// Standard retry strategy, adding client attempt rate limits. The attempt rate
+// limit is initially unrestricted, but becomes restricted when the attempt
+// fails with for a throttle error. When restricted AdaptiveMode may need to
+// sleep before an attempt is made, if too many throttles have been received.
+// AdaptiveMode's sleep can be canceled with context cancel. Set
+// AdaptiveModeOptions FailOnNoAttemptTokens to change the behavior from sleep,
+// to fail fast.
+//
+// Eventually unrestricted attempt rate limit will be restored once attempts no
+// longer are failing due to throttle errors.
+type AdaptiveMode struct {
+	options   AdaptiveModeOptions
+	throttles IsErrorThrottles
+
+	retryer   aws.RetryerV2
+	rateLimit *adaptiveRateLimit
+}
+
+// NewAdaptiveMode returns an initialized AdaptiveMode retry strategy.
+func NewAdaptiveMode(optFns ...func(*AdaptiveModeOptions)) *AdaptiveMode {
+	o := AdaptiveModeOptions{
+		RequestCost: DefaultRequestCost,
+		Throttles:   append([]IsErrorThrottle{}, DefaultThrottles...),
+	}
+	for _, fn := range optFns {
+		fn(&o)
+	}
+
+	return &AdaptiveMode{
+		options:   o,
+		throttles: IsErrorThrottles(o.Throttles),
+		retryer:   NewStandard(o.StandardOptions...),
+		rateLimit: newAdaptiveRateLimit(),
+	}
+}
+
+// IsErrorRetryable returns if the failed attempt is retryable. This check
+// should determine if the error can be retried, or if the error is
+// terminal.
+func (a *AdaptiveMode) IsErrorRetryable(err error) bool {
+	return a.retryer.IsErrorRetryable(err)
+}
+
+// MaxAttempts returns the maximum number of attempts that can be made for
+// a attempt before failing. A value of 0 implies that the attempt should
+// be retried until it succeeds if the errors are retryable.
+func (a *AdaptiveMode) MaxAttempts() int {
+	return a.retryer.MaxAttempts()
+}
+
+// RetryDelay returns the delay that should be used before retrying the
+// attempt. Will return error if the if the delay could not be determined.
+func (a *AdaptiveMode) RetryDelay(attempt int, opErr error) (
+	time.Duration, error,
+) {
+	return a.retryer.RetryDelay(attempt, opErr)
+}
+
+// GetRetryToken attempts to deduct the retry cost from the retry token pool.
+// Returning the token release function, or error.
+func (a *AdaptiveMode) GetRetryToken(ctx context.Context, opErr error) (
+	releaseToken func(error) error, err error,
+) {
+	return a.retryer.GetRetryToken(ctx, opErr)
+}
+
+// GetInitialToken returns the initial attempt token that can increment the
+// retry token pool if the attempt is successful.
+//
+// Deprecated: This method does not provide a way to block using Context,
+// nor can it return an error. Use RetryerV2, and GetAttemptToken instead. Only
+// present to implement Retryer interface.
+func (a *AdaptiveMode) GetInitialToken() (releaseToken func(error) error) {
+	return nopRelease
+}
+
+// GetAttemptToken returns the attempt token that can be used to rate limit
+// attempt calls. Will be used by the SDK's retry package's Attempt
+// middleware to get a attempt token prior to calling the temp and releasing
+// the attempt token after the attempt has been made.
+func (a *AdaptiveMode) GetAttemptToken(ctx context.Context) (func(error) error, error) {
+	for {
+		acquiredToken, waitTryAgain := a.rateLimit.AcquireToken(a.options.RequestCost)
+		if acquiredToken {
+			break
+		}
+		if a.options.FailOnNoAttemptTokens {
+			return nil, fmt.Errorf(
+				"unable to get attempt token, and FailOnNoAttemptTokens enables")
+		}
+
+		if err := sdk.SleepWithContext(ctx, waitTryAgain); err != nil {
+			return nil, fmt.Errorf("failed to wait for token to be available, %w", err)
+		}
+	}
+
+	return a.handleResponse, nil
+}
+
+func (a *AdaptiveMode) handleResponse(opErr error) error {
+	throttled := a.throttles.IsErrorThrottle(opErr).Bool()
+
+	a.rateLimit.Update(throttled)
+	return nil
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/adaptive_ratelimit.go

@@ -0,0 +1,158 @@
+package retry
+
+import (
+	"math"
+	"sync"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/internal/sdk"
+)
+
+type adaptiveRateLimit struct {
+	tokenBucketEnabled bool
+
+	smooth        float64
+	beta          float64
+	scaleConstant float64
+	minFillRate   float64
+
+	fillRate         float64
+	calculatedRate   float64
+	lastRefilled     time.Time
+	measuredTxRate   float64
+	lastTxRateBucket float64
+	requestCount     int64
+	lastMaxRate      float64
+	lastThrottleTime time.Time
+	timeWindow       float64
+
+	tokenBucket *adaptiveTokenBucket
+
+	mu sync.Mutex
+}
+
+func newAdaptiveRateLimit() *adaptiveRateLimit {
+	now := sdk.NowTime()
+	return &adaptiveRateLimit{
+		smooth:        0.8,
+		beta:          0.7,
+		scaleConstant: 0.4,
+
+		minFillRate: 0.5,
+
+		lastTxRateBucket: math.Floor(timeFloat64Seconds(now)),
+		lastThrottleTime: now,
+
+		tokenBucket: newAdaptiveTokenBucket(0),
+	}
+}
+
+func (a *adaptiveRateLimit) Enable(v bool) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+
+	a.tokenBucketEnabled = v
+}
+
+func (a *adaptiveRateLimit) AcquireToken(amount uint) (
+	tokenAcquired bool, waitTryAgain time.Duration,
+) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+
+	if !a.tokenBucketEnabled {
+		return true, 0
+	}
+
+	a.tokenBucketRefill()
+
+	available, ok := a.tokenBucket.Retrieve(float64(amount))
+	if !ok {
+		waitDur := float64Seconds((float64(amount) - available) / a.fillRate)
+		return false, waitDur
+	}
+
+	return true, 0
+}
+
+func (a *adaptiveRateLimit) Update(throttled bool) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+
+	a.updateMeasuredRate()
+
+	if throttled {
+		rateToUse := a.measuredTxRate
+		if a.tokenBucketEnabled {
+			rateToUse = math.Min(a.measuredTxRate, a.fillRate)
+		}
+
+		a.lastMaxRate = rateToUse
+		a.calculateTimeWindow()
+		a.lastThrottleTime = sdk.NowTime()
+		a.calculatedRate = a.cubicThrottle(rateToUse)
+		a.tokenBucketEnabled = true
+	} else {
+		a.calculateTimeWindow()
+		a.calculatedRate = a.cubicSuccess(sdk.NowTime())
+	}
+
+	newRate := math.Min(a.calculatedRate, 2*a.measuredTxRate)
+	a.tokenBucketUpdateRate(newRate)
+}
+
+func (a *adaptiveRateLimit) cubicSuccess(t time.Time) float64 {
+	dt := secondsFloat64(t.Sub(a.lastThrottleTime))
+	return (a.scaleConstant * math.Pow(dt-a.timeWindow, 3)) + a.lastMaxRate
+}
+
+func (a *adaptiveRateLimit) cubicThrottle(rateToUse float64) float64 {
+	return rateToUse * a.beta
+}
+
+func (a *adaptiveRateLimit) calculateTimeWindow() {
+	a.timeWindow = math.Pow((a.lastMaxRate*(1.-a.beta))/a.scaleConstant, 1./3.)
+}
+
+func (a *adaptiveRateLimit) tokenBucketUpdateRate(newRPS float64) {
+	a.tokenBucketRefill()
+	a.fillRate = math.Max(newRPS, a.minFillRate)
+	a.tokenBucket.Resize(newRPS)
+}
+
+func (a *adaptiveRateLimit) updateMeasuredRate() {
+	now := sdk.NowTime()
+	timeBucket := math.Floor(timeFloat64Seconds(now)*2.) / 2.
+	a.requestCount++
+
+	if timeBucket > a.lastTxRateBucket {
+		currentRate := float64(a.requestCount) / (timeBucket - a.lastTxRateBucket)
+		a.measuredTxRate = (currentRate * a.smooth) + (a.measuredTxRate * (1. - a.smooth))
+		a.requestCount = 0
+		a.lastTxRateBucket = timeBucket
+	}
+}
+
+func (a *adaptiveRateLimit) tokenBucketRefill() {
+	now := sdk.NowTime()
+	if a.lastRefilled.IsZero() {
+		a.lastRefilled = now
+		return
+	}
+
+	fillAmount := secondsFloat64(now.Sub(a.lastRefilled)) * a.fillRate
+	a.tokenBucket.Refund(fillAmount)
+	a.lastRefilled = now
+}
+
+func float64Seconds(v float64) time.Duration {
+	return time.Duration(v * float64(time.Second))
+}
+
+func secondsFloat64(v time.Duration) float64 {
+	return float64(v) / float64(time.Second)
+}
+
+func timeFloat64Seconds(v time.Time) float64 {
+	return float64(v.UnixNano()) / float64(time.Second)
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/adaptive_token_bucket.go

@@ -0,0 +1,83 @@
+package retry
+
+import (
+	"math"
+	"sync"
+)
+
+// adaptiveTokenBucket provides a concurrency safe utility for adding and
+// removing tokens from the available token bucket.
+type adaptiveTokenBucket struct {
+	remainingTokens float64
+	maxCapacity     float64
+	minCapacity     float64
+	mu              sync.Mutex
+}
+
+// newAdaptiveTokenBucket returns an initialized adaptiveTokenBucket with the
+// capacity specified.
+func newAdaptiveTokenBucket(i float64) *adaptiveTokenBucket {
+	return &adaptiveTokenBucket{
+		remainingTokens: i,
+		maxCapacity:     i,
+		minCapacity:     1,
+	}
+}
+
+// Retrieve attempts to reduce the available tokens by the amount requested. If
+// there are tokens available true will be returned along with the number of
+// available tokens remaining. If amount requested is larger than the available
+// capacity, false will be returned along with the available capacity. If the
+// amount is less than the available capacity, the capacity will be reduced by
+// that amount, and the remaining capacity and true will be returned.
+func (t *adaptiveTokenBucket) Retrieve(amount float64) (available float64, retrieved bool) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	if amount > t.remainingTokens {
+		return t.remainingTokens, false
+	}
+
+	t.remainingTokens -= amount
+	return t.remainingTokens, true
+}
+
+// Refund returns the amount of tokens back to the available token bucket, up
+// to the initial capacity.
+func (t *adaptiveTokenBucket) Refund(amount float64) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	// Capacity cannot exceed max capacity.
+	t.remainingTokens = math.Min(t.remainingTokens+amount, t.maxCapacity)
+}
+
+// Capacity returns the maximum capacity of tokens that the bucket could
+// contain.
+func (t *adaptiveTokenBucket) Capacity() float64 {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	return t.maxCapacity
+}
+
+// Remaining returns the number of tokens that remaining in the bucket.
+func (t *adaptiveTokenBucket) Remaining() float64 {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	return t.remainingTokens
+}
+
+// Resize adjusts the size of the token bucket. Returns the capacity remaining.
+func (t *adaptiveTokenBucket) Resize(size float64) float64 {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	t.maxCapacity = math.Max(size, t.minCapacity)
+
+	// Capacity needs to be capped at max capacity, if max size reduced.
+	t.remainingTokens = math.Min(t.remainingTokens, t.maxCapacity)
+
+	return t.remainingTokens
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/doc.go

@@ -0,0 +1,80 @@
+// Package retry provides interfaces and implementations for SDK request retry behavior.
+//
+// Retryer Interface and Implementations
+//
+// This packages defines Retryer interface that is used to either implement custom retry behavior
+// or to extend the existing retry implementations provided by the SDK. This packages provides a single
+// retry implementations: Standard.
+//
+// Standard
+//
+// Standard is the default retryer implementation used by service clients. The standard retryer is a rate limited
+// retryer that has a configurable max attempts to limit the number of retry attempts when a retryable error occurs.
+// In addition, the retryer uses a configurable token bucket to rate limit the retry attempts across the client,
+// and uses an additional delay policy to limit the time between a requests subsequent attempts.
+//
+// By default the standard retryer uses the DefaultRetryables slice of IsErrorRetryable types to determine whether
+// a given error is retryable. By default this list of retryables includes the following:
+//  - Retrying errors that implement the RetryableError method, and return true.
+//  - Connection Errors
+//    - Errors that implement a ConnectionError, Temporary, or Timeout method that return true.
+//    - Connection Reset Errors.
+//    - net.OpErr types that are dialing errors or are temporary.
+//    - HTTP Status Codes: 500, 502, 503, and 504.
+//  - API Error Codes
+//    - RequestTimeout, RequestTimeoutException
+//    - Throttling, ThrottlingException, ThrottledException, RequestThrottledException, TooManyRequestsException,
+//      RequestThrottled, SlowDown, EC2ThrottledException
+//    - ProvisionedThroughputExceededException, RequestLimitExceeded, BandwidthLimitExceeded, LimitExceededException
+//    - TransactionInProgressException, PriorRequestNotComplete
+//
+// The standard retryer will not retry a request in the event if the context associated with the request
+// has been cancelled. Applications must handle this case explicitly if they wish to retry with a different context
+// value.
+//
+// You can configure the standard retryer implementation to fit your applications by constructing a standard retryer
+// using the NewStandard function, and providing one more functional arguments that mutate the StandardOptions
+// structure. StandardOptions provides the ability to modify the token bucket rate limiter, retryable error conditions,
+// and the retry delay policy.
+//
+// For example to modify the default retry attempts for the standard retryer:
+//
+//  // configure the custom retryer
+//  customRetry := retry.NewStandard(func(o *retry.StandardOptions) {
+//      o.MaxAttempts = 5
+//  })
+//
+//  // create a service client with the retryer
+//  s3.NewFromConfig(cfg, func(o *s3.Options) {
+//      o.Retryer = customRetry
+//  })
+//
+// Utilities
+//
+// A number of package functions have been provided to easily wrap retryer implementations in an implementation agnostic
+// way. These are:
+//
+//   AddWithErrorCodes      - Provides the ability to add additional API error codes that should be considered retryable
+//                           in addition to those considered retryable by the provided retryer.
+//
+//   AddWithMaxAttempts     - Provides the ability to set the max number of attempts for retrying a request by wrapping
+//                            a retryer implementation.
+//
+//   AddWithMaxBackoffDelay - Provides the ability to set the max back off delay that can occur before retrying a
+//                            request by wrapping a retryer implementation.
+//
+// The following package functions have been provided to easily satisfy different retry interfaces to further customize
+// a given retryer's behavior:
+//
+//   BackoffDelayerFunc   - Can be used to wrap a function to satisfy the BackoffDelayer interface. For example,
+//                          you can use this method to easily create custom back off policies to be used with the
+//                          standard retryer.
+//
+//   IsErrorRetryableFunc - Can be used to wrap a function to satisfy the IsErrorRetryable interface. For example,
+//                          this can be used to extend the standard retryer to add additional logic ot determine if a
+//                          error should be retried.
+//
+//   IsErrorTimeoutFunc   - Can be used to wrap a function to satisfy IsErrorTimeout interface. For example,
+//                          this can be used to extend the standard retryer to add additional logic to determine if an
+//                           error should be considered a timeout.
+package retry

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/errors.go

@@ -0,0 +1,20 @@
+package retry
+
+import "fmt"
+
+// MaxAttemptsError provides the error when the maximum number of attempts have
+// been exceeded.
+type MaxAttemptsError struct {
+	Attempt int
+	Err     error
+}
+
+func (e *MaxAttemptsError) Error() string {
+	return fmt.Sprintf("exceeded maximum number of attempts, %d, %v", e.Attempt, e.Err)
+}
+
+// Unwrap returns the nested error causing the max attempts error. Provides the
+// implementation for errors.Is and errors.As to unwrap nested errors.
+func (e *MaxAttemptsError) Unwrap() error {
+	return e.Err
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/jitter_backoff.go

@@ -0,0 +1,49 @@
+package retry
+
+import (
+	"math"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/internal/rand"
+	"github.com/aws/aws-sdk-go-v2/internal/timeconv"
+)
+
+// ExponentialJitterBackoff provides backoff delays with jitter based on the
+// number of attempts.
+type ExponentialJitterBackoff struct {
+	maxBackoff time.Duration
+	// precomputed number of attempts needed to reach max backoff.
+	maxBackoffAttempts float64
+
+	randFloat64 func() (float64, error)
+}
+
+// NewExponentialJitterBackoff returns an ExponentialJitterBackoff configured
+// for the max backoff.
+func NewExponentialJitterBackoff(maxBackoff time.Duration) *ExponentialJitterBackoff {
+	return &ExponentialJitterBackoff{
+		maxBackoff: maxBackoff,
+		maxBackoffAttempts: math.Log2(
+			float64(maxBackoff) / float64(time.Second)),
+		randFloat64: rand.CryptoRandFloat64,
+	}
+}
+
+// BackoffDelay returns the duration to wait before the next attempt should be
+// made. Returns an error if unable get a duration.
+func (j *ExponentialJitterBackoff) BackoffDelay(attempt int, err error) (time.Duration, error) {
+	if attempt > int(j.maxBackoffAttempts) {
+		return j.maxBackoff, nil
+	}
+
+	b, err := j.randFloat64()
+	if err != nil {
+		return 0, err
+	}
+
+	// [0.0, 1.0) * 2 ^ attempts
+	ri := int64(1 << uint64(attempt))
+	delaySeconds := b * float64(ri)
+
+	return timeconv.FloatSecondsDur(delaySeconds), nil
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/metadata.go

@@ -0,0 +1,52 @@
+package retry
+
+import (
+	awsmiddle "github.com/aws/aws-sdk-go-v2/aws/middleware"
+	"github.com/aws/smithy-go/middleware"
+)
+
+// attemptResultsKey is a metadata accessor key to retrieve metadata
+// for all request attempts.
+type attemptResultsKey struct {
+}
+
+// GetAttemptResults retrieves attempts results from middleware metadata.
+func GetAttemptResults(metadata middleware.Metadata) (AttemptResults, bool) {
+	m, ok := metadata.Get(attemptResultsKey{}).(AttemptResults)
+	return m, ok
+}
+
+// AttemptResults represents struct containing metadata returned by all request attempts.
+type AttemptResults struct {
+
+	// Results is a slice consisting attempt result from all request attempts.
+	// Results are stored in order request attempt is made.
+	Results []AttemptResult
+}
+
+// AttemptResult represents attempt result returned by a single request attempt.
+type AttemptResult struct {
+
+	// Err is the error if received for the request attempt.
+	Err error
+
+	// Retryable denotes if request may be retried. This states if an
+	// error is considered retryable.
+	Retryable bool
+
+	// Retried indicates if this request was retried.
+	Retried bool
+
+	// ResponseMetadata is any existing metadata passed via the response middlewares.
+	ResponseMetadata middleware.Metadata
+}
+
+// addAttemptResults adds attempt results to middleware metadata
+func addAttemptResults(metadata *middleware.Metadata, v AttemptResults) {
+	metadata.Set(attemptResultsKey{}, v)
+}
+
+// GetRawResponse returns raw response recorded for the attempt result
+func (a AttemptResult) GetRawResponse() interface{} {
+	return awsmiddle.GetRawResponse(a.ResponseMetadata)
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/middleware.go

@@ -0,0 +1,331 @@
+package retry
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awsmiddle "github.com/aws/aws-sdk-go-v2/aws/middleware"
+	"github.com/aws/aws-sdk-go-v2/internal/sdk"
+	"github.com/aws/smithy-go/logging"
+	"github.com/aws/smithy-go/middleware"
+	smithymiddle "github.com/aws/smithy-go/middleware"
+	"github.com/aws/smithy-go/transport/http"
+)
+
+// RequestCloner is a function that can take an input request type and clone
+// the request for use in a subsequent retry attempt.
+type RequestCloner func(interface{}) interface{}
+
+type retryMetadata struct {
+	AttemptNum       int
+	AttemptTime      time.Time
+	MaxAttempts      int
+	AttemptClockSkew time.Duration
+}
+
+// Attempt is a Smithy Finalize middleware that handles retry attempts using
+// the provided Retryer implementation.
+type Attempt struct {
+	// Enable the logging of retry attempts performed by the SDK. This will
+	// include logging retry attempts, unretryable errors, and when max
+	// attempts are reached.
+	LogAttempts bool
+
+	retryer       aws.RetryerV2
+	requestCloner RequestCloner
+}
+
+// NewAttemptMiddleware returns a new Attempt retry middleware.
+func NewAttemptMiddleware(retryer aws.Retryer, requestCloner RequestCloner, optFns ...func(*Attempt)) *Attempt {
+	m := &Attempt{
+		retryer:       wrapAsRetryerV2(retryer),
+		requestCloner: requestCloner,
+	}
+	for _, fn := range optFns {
+		fn(m)
+	}
+	return m
+}
+
+// ID returns the middleware identifier
+func (r *Attempt) ID() string { return "Retry" }
+
+func (r Attempt) logf(logger logging.Logger, classification logging.Classification, format string, v ...interface{}) {
+	if !r.LogAttempts {
+		return
+	}
+	logger.Logf(classification, format, v...)
+}
+
+// HandleFinalize utilizes the provider Retryer implementation to attempt
+// retries over the next handler
+func (r *Attempt) HandleFinalize(ctx context.Context, in smithymiddle.FinalizeInput, next smithymiddle.FinalizeHandler) (
+	out smithymiddle.FinalizeOutput, metadata smithymiddle.Metadata, err error,
+) {
+	var attemptNum int
+	var attemptClockSkew time.Duration
+	var attemptResults AttemptResults
+
+	maxAttempts := r.retryer.MaxAttempts()
+	releaseRetryToken := nopRelease
+
+	for {
+		attemptNum++
+		attemptInput := in
+		attemptInput.Request = r.requestCloner(attemptInput.Request)
+
+		// Record the metadata for the for attempt being started.
+		attemptCtx := setRetryMetadata(ctx, retryMetadata{
+			AttemptNum:       attemptNum,
+			AttemptTime:      sdk.NowTime().UTC(),
+			MaxAttempts:      maxAttempts,
+			AttemptClockSkew: attemptClockSkew,
+		})
+
+		var attemptResult AttemptResult
+		out, attemptResult, releaseRetryToken, err = r.handleAttempt(attemptCtx, attemptInput, releaseRetryToken, next)
+		attemptClockSkew, _ = awsmiddle.GetAttemptSkew(attemptResult.ResponseMetadata)
+
+		// AttempResult Retried states that the attempt was not successful, and
+		// should be retried.
+		shouldRetry := attemptResult.Retried
+
+		// Add attempt metadata to list of all attempt metadata
+		attemptResults.Results = append(attemptResults.Results, attemptResult)
+
+		if !shouldRetry {
+			// Ensure the last response's metadata is used as the bases for result
+			// metadata returned by the stack. The Slice of attempt results
+			// will be added to this cloned metadata.
+			metadata = attemptResult.ResponseMetadata.Clone()
+
+			break
+		}
+	}
+
+	addAttemptResults(&metadata, attemptResults)
+	return out, metadata, err
+}
+
+// handleAttempt handles an individual request attempt.
+func (r *Attempt) handleAttempt(
+	ctx context.Context, in smithymiddle.FinalizeInput, releaseRetryToken func(error) error, next smithymiddle.FinalizeHandler,
+) (
+	out smithymiddle.FinalizeOutput, attemptResult AttemptResult, _ func(error) error, err error,
+) {
+	defer func() {
+		attemptResult.Err = err
+	}()
+
+	// Short circuit if this attempt never can succeed because the context is
+	// canceled. This reduces the chance of token pools being modified for
+	// attempts that will not be made
+	select {
+	case <-ctx.Done():
+		return out, attemptResult, nopRelease, ctx.Err()
+	default:
+	}
+
+	//------------------------------
+	// Get Attempt Token
+	//------------------------------
+	releaseAttemptToken, err := r.retryer.GetAttemptToken(ctx)
+	if err != nil {
+		return out, attemptResult, nopRelease, fmt.Errorf(
+			"failed to get retry Send token, %w", err)
+	}
+
+	//------------------------------
+	// Send Attempt
+	//------------------------------
+	logger := smithymiddle.GetLogger(ctx)
+	service, operation := awsmiddle.GetServiceID(ctx), awsmiddle.GetOperationName(ctx)
+	retryMetadata, _ := getRetryMetadata(ctx)
+	attemptNum := retryMetadata.AttemptNum
+	maxAttempts := retryMetadata.MaxAttempts
+
+	// Following attempts must ensure the request payload stream starts in a
+	// rewound state.
+	if attemptNum > 1 {
+		if rewindable, ok := in.Request.(interface{ RewindStream() error }); ok {
+			if rewindErr := rewindable.RewindStream(); rewindErr != nil {
+				return out, attemptResult, nopRelease, fmt.Errorf(
+					"failed to rewind transport stream for retry, %w", rewindErr)
+			}
+		}
+
+		r.logf(logger, logging.Debug, "retrying request %s/%s, attempt %d",
+			service, operation, attemptNum)
+	}
+
+	var metadata smithymiddle.Metadata
+	out, metadata, err = next.HandleFinalize(ctx, in)
+	attemptResult.ResponseMetadata = metadata
+
+	//------------------------------
+	// Bookkeeping
+	//------------------------------
+	// Release the retry token based on the state of the attempt's error (if any).
+	if releaseError := releaseRetryToken(err); releaseError != nil && err != nil {
+		return out, attemptResult, nopRelease, fmt.Errorf(
+			"failed to release retry token after request error, %w", err)
+	}
+	// Release the attempt token based on the state of the attempt's error (if any).
+	if releaseError := releaseAttemptToken(err); releaseError != nil && err != nil {
+		return out, attemptResult, nopRelease, fmt.Errorf(
+			"failed to release initial token after request error, %w", err)
+	}
+	// If there was no error making the attempt, nothing further to do. There
+	// will be nothing to retry.
+	if err == nil {
+		return out, attemptResult, nopRelease, err
+	}
+
+	//------------------------------
+	// Is Retryable and Should Retry
+	//------------------------------
+	// If the attempt failed with an unretryable error, nothing further to do
+	// but return, and inform the caller about the terminal failure.
+	retryable := r.retryer.IsErrorRetryable(err)
+	if !retryable {
+		r.logf(logger, logging.Debug, "request failed with unretryable error %v", err)
+		return out, attemptResult, nopRelease, err
+	}
+
+	// set retryable to true
+	attemptResult.Retryable = true
+
+	// Once the maximum number of attempts have been exhausted there is nothing
+	// further to do other than inform the caller about the terminal failure.
+	if maxAttempts > 0 && attemptNum >= maxAttempts {
+		r.logf(logger, logging.Debug, "max retry attempts exhausted, max %d", maxAttempts)
+		err = &MaxAttemptsError{
+			Attempt: attemptNum,
+			Err:     err,
+		}
+		return out, attemptResult, nopRelease, err
+	}
+
+	//------------------------------
+	// Get Retry (aka Retry Quota) Token
+	//------------------------------
+	// Get a retry token that will be released after the
+	releaseRetryToken, retryTokenErr := r.retryer.GetRetryToken(ctx, err)
+	if retryTokenErr != nil {
+		return out, attemptResult, nopRelease, retryTokenErr
+	}
+
+	//------------------------------
+	// Retry Delay and Sleep
+	//------------------------------
+	// Get the retry delay before another attempt can be made, and sleep for
+	// that time. Potentially early exist if the sleep is canceled via the
+	// context.
+	retryDelay, reqErr := r.retryer.RetryDelay(attemptNum, err)
+	if reqErr != nil {
+		return out, attemptResult, releaseRetryToken, reqErr
+	}
+	if reqErr = sdk.SleepWithContext(ctx, retryDelay); reqErr != nil {
+		err = &aws.RequestCanceledError{Err: reqErr}
+		return out, attemptResult, releaseRetryToken, err
+	}
+
+	// The request should be re-attempted.
+	attemptResult.Retried = true
+
+	return out, attemptResult, releaseRetryToken, err
+}
+
+// MetricsHeader attaches SDK request metric header for retries to the transport
+type MetricsHeader struct{}
+
+// ID returns the middleware identifier
+func (r *MetricsHeader) ID() string {
+	return "RetryMetricsHeader"
+}
+
+// HandleFinalize attaches the SDK request metric header to the transport layer
+func (r MetricsHeader) HandleFinalize(ctx context.Context, in smithymiddle.FinalizeInput, next smithymiddle.FinalizeHandler) (
+	out smithymiddle.FinalizeOutput, metadata smithymiddle.Metadata, err error,
+) {
+	retryMetadata, _ := getRetryMetadata(ctx)
+
+	const retryMetricHeader = "Amz-Sdk-Request"
+	var parts []string
+
+	parts = append(parts, "attempt="+strconv.Itoa(retryMetadata.AttemptNum))
+	if retryMetadata.MaxAttempts != 0 {
+		parts = append(parts, "max="+strconv.Itoa(retryMetadata.MaxAttempts))
+	}
+
+	var ttl time.Time
+	if deadline, ok := ctx.Deadline(); ok {
+		ttl = deadline
+	}
+
+	// Only append the TTL if it can be determined.
+	if !ttl.IsZero() && retryMetadata.AttemptClockSkew > 0 {
+		const unixTimeFormat = "20060102T150405Z"
+		ttl = ttl.Add(retryMetadata.AttemptClockSkew)
+		parts = append(parts, "ttl="+ttl.Format(unixTimeFormat))
+	}
+
+	switch req := in.Request.(type) {
+	case *http.Request:
+		req.Header[retryMetricHeader] = append(req.Header[retryMetricHeader][:0], strings.Join(parts, "; "))
+	default:
+		return out, metadata, fmt.Errorf("unknown transport type %T", req)
+	}
+
+	return next.HandleFinalize(ctx, in)
+}
+
+type retryMetadataKey struct{}
+
+// getRetryMetadata retrieves retryMetadata from the context and a bool
+// indicating if it was set.
+//
+// Scoped to stack values. Use github.com/aws/smithy-go/middleware#ClearStackValues
+// to clear all stack values.
+func getRetryMetadata(ctx context.Context) (metadata retryMetadata, ok bool) {
+	metadata, ok = middleware.GetStackValue(ctx, retryMetadataKey{}).(retryMetadata)
+	return metadata, ok
+}
+
+// setRetryMetadata sets the retryMetadata on the context.
+//
+// Scoped to stack values. Use github.com/aws/smithy-go/middleware#ClearStackValues
+// to clear all stack values.
+func setRetryMetadata(ctx context.Context, metadata retryMetadata) context.Context {
+	return middleware.WithStackValue(ctx, retryMetadataKey{}, metadata)
+}
+
+// AddRetryMiddlewaresOptions is the set of options that can be passed to
+// AddRetryMiddlewares for configuring retry associated middleware.
+type AddRetryMiddlewaresOptions struct {
+	Retryer aws.Retryer
+
+	// Enable the logging of retry attempts performed by the SDK. This will
+	// include logging retry attempts, unretryable errors, and when max
+	// attempts are reached.
+	LogRetryAttempts bool
+}
+
+// AddRetryMiddlewares adds retry middleware to operation middleware stack
+func AddRetryMiddlewares(stack *smithymiddle.Stack, options AddRetryMiddlewaresOptions) error {
+	attempt := NewAttemptMiddleware(options.Retryer, http.RequestCloner, func(middleware *Attempt) {
+		middleware.LogAttempts = options.LogRetryAttempts
+	})
+
+	if err := stack.Finalize.Add(attempt, smithymiddle.After); err != nil {
+		return err
+	}
+	if err := stack.Finalize.Add(&MetricsHeader{}, smithymiddle.After); err != nil {
+		return err
+	}
+	return nil
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/retry.go

@@ -0,0 +1,90 @@
+package retry
+
+import (
+	"context"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+// AddWithErrorCodes returns a Retryer with additional error codes considered
+// for determining if the error should be retried.
+func AddWithErrorCodes(r aws.Retryer, codes ...string) aws.Retryer {
+	retryable := &RetryableErrorCode{
+		Codes: map[string]struct{}{},
+	}
+	for _, c := range codes {
+		retryable.Codes[c] = struct{}{}
+	}
+
+	return &withIsErrorRetryable{
+		RetryerV2: wrapAsRetryerV2(r),
+		Retryable: retryable,
+	}
+}
+
+type withIsErrorRetryable struct {
+	aws.RetryerV2
+	Retryable IsErrorRetryable
+}
+
+func (r *withIsErrorRetryable) IsErrorRetryable(err error) bool {
+	if v := r.Retryable.IsErrorRetryable(err); v != aws.UnknownTernary {
+		return v.Bool()
+	}
+	return r.RetryerV2.IsErrorRetryable(err)
+}
+
+// AddWithMaxAttempts returns a Retryer with MaxAttempts set to the value
+// specified.
+func AddWithMaxAttempts(r aws.Retryer, max int) aws.Retryer {
+	return &withMaxAttempts{
+		RetryerV2: wrapAsRetryerV2(r),
+		Max:       max,
+	}
+}
+
+type withMaxAttempts struct {
+	aws.RetryerV2
+	Max int
+}
+
+func (w *withMaxAttempts) MaxAttempts() int {
+	return w.Max
+}
+
+// AddWithMaxBackoffDelay returns a retryer wrapping the passed in retryer
+// overriding the RetryDelay behavior for a alternate minimum initial backoff
+// delay.
+func AddWithMaxBackoffDelay(r aws.Retryer, delay time.Duration) aws.Retryer {
+	return &withMaxBackoffDelay{
+		RetryerV2: wrapAsRetryerV2(r),
+		backoff:   NewExponentialJitterBackoff(delay),
+	}
+}
+
+type withMaxBackoffDelay struct {
+	aws.RetryerV2
+	backoff *ExponentialJitterBackoff
+}
+
+func (r *withMaxBackoffDelay) RetryDelay(attempt int, err error) (time.Duration, error) {
+	return r.backoff.BackoffDelay(attempt, err)
+}
+
+type wrappedAsRetryerV2 struct {
+	aws.Retryer
+}
+
+func wrapAsRetryerV2(r aws.Retryer) aws.RetryerV2 {
+	v, ok := r.(aws.RetryerV2)
+	if !ok {
+		v = wrappedAsRetryerV2{Retryer: r}
+	}
+
+	return v
+}
+
+func (w wrappedAsRetryerV2) GetAttemptToken(context.Context) (func(error) error, error) {
+	return w.Retryer.GetInitialToken(), nil
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/retryable_error.go

@@ -0,0 +1,186 @@
+package retry
+
+import (
+	"errors"
+	"net"
+	"net/url"
+	"strings"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+// IsErrorRetryable provides the interface of an implementation to determine if
+// a error as the result of an operation is retryable.
+type IsErrorRetryable interface {
+	IsErrorRetryable(error) aws.Ternary
+}
+
+// IsErrorRetryables is a collection of checks to determine of the error is
+// retryable.  Iterates through the checks and returns the state of retryable
+// if any check returns something other than unknown.
+type IsErrorRetryables []IsErrorRetryable
+
+// IsErrorRetryable returns if the error is retryable if any of the checks in
+// the list return a value other than unknown.
+func (r IsErrorRetryables) IsErrorRetryable(err error) aws.Ternary {
+	for _, re := range r {
+		if v := re.IsErrorRetryable(err); v != aws.UnknownTernary {
+			return v
+		}
+	}
+	return aws.UnknownTernary
+}
+
+// IsErrorRetryableFunc wraps a function with the IsErrorRetryable interface.
+type IsErrorRetryableFunc func(error) aws.Ternary
+
+// IsErrorRetryable returns if the error is retryable.
+func (fn IsErrorRetryableFunc) IsErrorRetryable(err error) aws.Ternary {
+	return fn(err)
+}
+
+// RetryableError is an IsErrorRetryable implementation which uses the
+// optional interface Retryable on the error value to determine if the error is
+// retryable.
+type RetryableError struct{}
+
+// IsErrorRetryable returns if the error is retryable if it satisfies the
+// Retryable interface, and returns if the attempt should be retried.
+func (RetryableError) IsErrorRetryable(err error) aws.Ternary {
+	var v interface{ RetryableError() bool }
+
+	if !errors.As(err, &v) {
+		return aws.UnknownTernary
+	}
+
+	return aws.BoolTernary(v.RetryableError())
+}
+
+// NoRetryCanceledError detects if the error was an request canceled error and
+// returns if so.
+type NoRetryCanceledError struct{}
+
+// IsErrorRetryable returns the error is not retryable if the request was
+// canceled.
+func (NoRetryCanceledError) IsErrorRetryable(err error) aws.Ternary {
+	var v interface{ CanceledError() bool }
+
+	if !errors.As(err, &v) {
+		return aws.UnknownTernary
+	}
+
+	if v.CanceledError() {
+		return aws.FalseTernary
+	}
+	return aws.UnknownTernary
+}
+
+// RetryableConnectionError determines if the underlying error is an HTTP
+// connection and returns if it should be retried.
+//
+// Includes errors such as connection reset, connection refused, net dial,
+// temporary, and timeout errors.
+type RetryableConnectionError struct{}
+
+// IsErrorRetryable returns if the error is caused by and HTTP connection
+// error, and should be retried.
+func (r RetryableConnectionError) IsErrorRetryable(err error) aws.Ternary {
+	if err == nil {
+		return aws.UnknownTernary
+	}
+	var retryable bool
+
+	var conErr interface{ ConnectionError() bool }
+	var tempErr interface{ Temporary() bool }
+	var timeoutErr interface{ Timeout() bool }
+	var urlErr *url.Error
+	var netOpErr *net.OpError
+
+	switch {
+	case errors.As(err, &conErr) && conErr.ConnectionError():
+		retryable = true
+
+	case strings.Contains(err.Error(), "connection reset"):
+		retryable = true
+
+	case errors.As(err, &urlErr):
+		// Refused connections should be retried as the service may not yet be
+		// running on the port. Go TCP dial considers refused connections as
+		// not temporary.
+		if strings.Contains(urlErr.Error(), "connection refused") {
+			retryable = true
+		} else {
+			return r.IsErrorRetryable(errors.Unwrap(urlErr))
+		}
+
+	case errors.As(err, &netOpErr):
+		// Network dial, or temporary network errors are always retryable.
+		if strings.EqualFold(netOpErr.Op, "dial") || netOpErr.Temporary() {
+			retryable = true
+		} else {
+			return r.IsErrorRetryable(errors.Unwrap(netOpErr))
+		}
+
+	case errors.As(err, &tempErr) && tempErr.Temporary():
+		// Fallback to the generic temporary check, with temporary errors
+		// retryable.
+		retryable = true
+
+	case errors.As(err, &timeoutErr) && timeoutErr.Timeout():
+		// Fallback to the generic timeout check, with timeout errors
+		// retryable.
+		retryable = true
+
+	default:
+		return aws.UnknownTernary
+	}
+
+	return aws.BoolTernary(retryable)
+
+}
+
+// RetryableHTTPStatusCode provides a IsErrorRetryable based on HTTP status
+// codes.
+type RetryableHTTPStatusCode struct {
+	Codes map[int]struct{}
+}
+
+// IsErrorRetryable return if the passed in error is retryable based on the
+// HTTP status code.
+func (r RetryableHTTPStatusCode) IsErrorRetryable(err error) aws.Ternary {
+	var v interface{ HTTPStatusCode() int }
+
+	if !errors.As(err, &v) {
+		return aws.UnknownTernary
+	}
+
+	_, ok := r.Codes[v.HTTPStatusCode()]
+	if !ok {
+		return aws.UnknownTernary
+	}
+
+	return aws.TrueTernary
+}
+
+// RetryableErrorCode determines if an attempt should be retried based on the
+// API error code.
+type RetryableErrorCode struct {
+	Codes map[string]struct{}
+}
+
+// IsErrorRetryable return if the error is retryable based on the error codes.
+// Returns unknown if the error doesn't have a code or it is unknown.
+func (r RetryableErrorCode) IsErrorRetryable(err error) aws.Ternary {
+	var v interface{ ErrorCode() string }
+
+	if !errors.As(err, &v) {
+		return aws.UnknownTernary
+	}
+
+	_, ok := r.Codes[v.ErrorCode()]
+	if !ok {
+		return aws.UnknownTernary
+	}
+
+	return aws.TrueTernary
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/standard.go

@@ -0,0 +1,258 @@
+package retry
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws/ratelimit"
+)
+
+// BackoffDelayer provides the interface for determining the delay to before
+// another request attempt, that previously failed.
+type BackoffDelayer interface {
+	BackoffDelay(attempt int, err error) (time.Duration, error)
+}
+
+// BackoffDelayerFunc provides a wrapper around a function to determine the
+// backoff delay of an attempt retry.
+type BackoffDelayerFunc func(int, error) (time.Duration, error)
+
+// BackoffDelay returns the delay before attempt to retry a request.
+func (fn BackoffDelayerFunc) BackoffDelay(attempt int, err error) (time.Duration, error) {
+	return fn(attempt, err)
+}
+
+const (
+	// DefaultMaxAttempts is the maximum of attempts for an API request
+	DefaultMaxAttempts int = 3
+
+	// DefaultMaxBackoff is the maximum back off delay between attempts
+	DefaultMaxBackoff time.Duration = 20 * time.Second
+)
+
+// Default retry token quota values.
+const (
+	DefaultRetryRateTokens  uint = 500
+	DefaultRetryCost        uint = 5
+	DefaultRetryTimeoutCost uint = 10
+	DefaultNoRetryIncrement uint = 1
+)
+
+// DefaultRetryableHTTPStatusCodes is the default set of HTTP status codes the SDK
+// should consider as retryable errors.
+var DefaultRetryableHTTPStatusCodes = map[int]struct{}{
+	500: {},
+	502: {},
+	503: {},
+	504: {},
+}
+
+// DefaultRetryableErrorCodes provides the set of API error codes that should
+// be retried.
+var DefaultRetryableErrorCodes = map[string]struct{}{
+	"RequestTimeout":          {},
+	"RequestTimeoutException": {},
+}
+
+// DefaultThrottleErrorCodes provides the set of API error codes that are
+// considered throttle errors.
+var DefaultThrottleErrorCodes = map[string]struct{}{
+	"Throttling":                             {},
+	"ThrottlingException":                    {},
+	"ThrottledException":                     {},
+	"RequestThrottledException":              {},
+	"TooManyRequestsException":               {},
+	"ProvisionedThroughputExceededException": {},
+	"TransactionInProgressException":         {},
+	"RequestLimitExceeded":                   {},
+	"BandwidthLimitExceeded":                 {},
+	"LimitExceededException":                 {},
+	"RequestThrottled":                       {},
+	"SlowDown":                               {},
+	"PriorRequestNotComplete":                {},
+	"EC2ThrottledException":                  {},
+}
+
+// DefaultRetryables provides the set of retryable checks that are used by
+// default.
+var DefaultRetryables = []IsErrorRetryable{
+	NoRetryCanceledError{},
+	RetryableError{},
+	RetryableConnectionError{},
+	RetryableHTTPStatusCode{
+		Codes: DefaultRetryableHTTPStatusCodes,
+	},
+	RetryableErrorCode{
+		Codes: DefaultRetryableErrorCodes,
+	},
+	RetryableErrorCode{
+		Codes: DefaultThrottleErrorCodes,
+	},
+}
+
+// DefaultTimeouts provides the set of timeout checks that are used by default.
+var DefaultTimeouts = []IsErrorTimeout{
+	TimeouterError{},
+}
+
+// StandardOptions provides the functional options for configuring the standard
+// retryable, and delay behavior.
+type StandardOptions struct {
+	// Maximum number of attempts that should be made.
+	MaxAttempts int
+
+	// MaxBackoff duration between retried attempts.
+	MaxBackoff time.Duration
+
+	// Provides the backoff strategy the retryer will use to determine the
+	// delay between retry attempts.
+	Backoff BackoffDelayer
+
+	// Set of strategies to determine if the attempt should be retried based on
+	// the error response received.
+	//
+	// It is safe to append to this list in NewStandard's functional options.
+	Retryables []IsErrorRetryable
+
+	// Set of strategies to determine if the attempt failed due to a timeout
+	// error.
+	//
+	// It is safe to append to this list in NewStandard's functional options.
+	Timeouts []IsErrorTimeout
+
+	// Provides the rate limiting strategy for rate limiting attempt retries
+	// across all attempts the retryer is being used with.
+	RateLimiter RateLimiter
+
+	// The cost to deduct from the RateLimiter's token bucket per retry.
+	RetryCost uint
+
+	// The cost to deduct from the RateLimiter's token bucket per retry caused
+	// by timeout error.
+	RetryTimeoutCost uint
+
+	// The cost to payback to the RateLimiter's token bucket for successful
+	// attempts.
+	NoRetryIncrement uint
+}
+
+// RateLimiter provides the interface for limiting the rate of attempt retries
+// allowed by the retryer.
+type RateLimiter interface {
+	GetToken(ctx context.Context, cost uint) (releaseToken func() error, err error)
+	AddTokens(uint) error
+}
+
+// Standard is the standard retry pattern for the SDK. It uses a set of
+// retryable checks to determine of the failed attempt should be retried, and
+// what retry delay should be used.
+type Standard struct {
+	options StandardOptions
+
+	timeout   IsErrorTimeout
+	retryable IsErrorRetryable
+	backoff   BackoffDelayer
+}
+
+// NewStandard initializes a standard retry behavior with defaults that can be
+// overridden via functional options.
+func NewStandard(fnOpts ...func(*StandardOptions)) *Standard {
+	o := StandardOptions{
+		MaxAttempts: DefaultMaxAttempts,
+		MaxBackoff:  DefaultMaxBackoff,
+		Retryables:  append([]IsErrorRetryable{}, DefaultRetryables...),
+		Timeouts:    append([]IsErrorTimeout{}, DefaultTimeouts...),
+
+		RateLimiter:      ratelimit.NewTokenRateLimit(DefaultRetryRateTokens),
+		RetryCost:        DefaultRetryCost,
+		RetryTimeoutCost: DefaultRetryTimeoutCost,
+		NoRetryIncrement: DefaultNoRetryIncrement,
+	}
+	for _, fn := range fnOpts {
+		fn(&o)
+	}
+	if o.MaxAttempts <= 0 {
+		o.MaxAttempts = DefaultMaxAttempts
+	}
+
+	backoff := o.Backoff
+	if backoff == nil {
+		backoff = NewExponentialJitterBackoff(o.MaxBackoff)
+	}
+
+	return &Standard{
+		options:   o,
+		backoff:   backoff,
+		retryable: IsErrorRetryables(o.Retryables),
+		timeout:   IsErrorTimeouts(o.Timeouts),
+	}
+}
+
+// MaxAttempts returns the maximum number of attempts that can be made for a
+// request before failing.
+func (s *Standard) MaxAttempts() int {
+	return s.options.MaxAttempts
+}
+
+// IsErrorRetryable returns if the error is can be retried or not. Should not
+// consider the number of attempts made.
+func (s *Standard) IsErrorRetryable(err error) bool {
+	return s.retryable.IsErrorRetryable(err).Bool()
+}
+
+// RetryDelay returns the delay to use before another request attempt is made.
+func (s *Standard) RetryDelay(attempt int, err error) (time.Duration, error) {
+	return s.backoff.BackoffDelay(attempt, err)
+}
+
+// GetAttemptToken returns the token to be released after then attempt completes.
+// The release token will add NoRetryIncrement to the RateLimiter token pool if
+// the attempt was successful. If the attempt failed, nothing will be done.
+func (s *Standard) GetAttemptToken(context.Context) (func(error) error, error) {
+	return s.GetInitialToken(), nil
+}
+
+// GetInitialToken returns a token for adding the NoRetryIncrement to the
+// RateLimiter token if the attempt completed successfully without error.
+//
+// InitialToken applies to result of the each attempt, including the first.
+// Whereas the RetryToken applies to the result of subsequent attempts.
+//
+// Deprecated: use GetAttemptToken instead.
+func (s *Standard) GetInitialToken() func(error) error {
+	return releaseToken(s.noRetryIncrement).release
+}
+
+func (s *Standard) noRetryIncrement() error {
+	return s.options.RateLimiter.AddTokens(s.options.NoRetryIncrement)
+}
+
+// GetRetryToken attempts to deduct the retry cost from the retry token pool.
+// Returning the token release function, or error.
+func (s *Standard) GetRetryToken(ctx context.Context, opErr error) (func(error) error, error) {
+	cost := s.options.RetryCost
+
+	if s.timeout.IsErrorTimeout(opErr).Bool() {
+		cost = s.options.RetryTimeoutCost
+	}
+
+	fn, err := s.options.RateLimiter.GetToken(ctx, cost)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get rate limit token, %w", err)
+	}
+
+	return releaseToken(fn).release, nil
+}
+
+func nopRelease(error) error { return nil }
+
+type releaseToken func() error
+
+func (f releaseToken) release(err error) error {
+	if err != nil {
+		return nil
+	}
+
+	return f()
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/throttle_error.go

@@ -0,0 +1,60 @@
+package retry
+
+import (
+	"errors"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+// IsErrorThrottle provides the interface of an implementation to determine if
+// a error response from an operation is a throttling error.
+type IsErrorThrottle interface {
+	IsErrorThrottle(error) aws.Ternary
+}
+
+// IsErrorThrottles is a collection of checks to determine of the error a
+// throttle error. Iterates through the checks and returns the state of
+// throttle if any check returns something other than unknown.
+type IsErrorThrottles []IsErrorThrottle
+
+// IsErrorThrottle returns if the error is a throttle error if any of the
+// checks in the list return a value other than unknown.
+func (r IsErrorThrottles) IsErrorThrottle(err error) aws.Ternary {
+	for _, re := range r {
+		if v := re.IsErrorThrottle(err); v != aws.UnknownTernary {
+			return v
+		}
+	}
+	return aws.UnknownTernary
+}
+
+// IsErrorThrottleFunc wraps a function with the IsErrorThrottle interface.
+type IsErrorThrottleFunc func(error) aws.Ternary
+
+// IsErrorThrottle returns if the error is a throttle error.
+func (fn IsErrorThrottleFunc) IsErrorThrottle(err error) aws.Ternary {
+	return fn(err)
+}
+
+// ThrottleErrorCode determines if an attempt should be retried based on the
+// API error code.
+type ThrottleErrorCode struct {
+	Codes map[string]struct{}
+}
+
+// IsErrorThrottle return if the error is a throttle error based on the error
+// codes. Returns unknown if the error doesn't have a code or it is unknown.
+func (r ThrottleErrorCode) IsErrorThrottle(err error) aws.Ternary {
+	var v interface{ ErrorCode() string }
+
+	if !errors.As(err, &v) {
+		return aws.UnknownTernary
+	}
+
+	_, ok := r.Codes[v.ErrorCode()]
+	if !ok {
+		return aws.UnknownTernary
+	}
+
+	return aws.TrueTernary
+}

vendor/github.com/aws/aws-sdk-go-v2/aws/retry/timeout_error.go

@@ -0,0 +1,52 @@
+package retry
+
+import (
+	"errors"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+// IsErrorTimeout provides the interface of an implementation to determine if
+// a error matches.
+type IsErrorTimeout interface {
+	IsErrorTimeout(err error) aws.Ternary
+}
+
+// IsErrorTimeouts is a collection of checks to determine of the error is
+// retryable. Iterates through the checks and returns the state of retryable
+// if any check returns something other than unknown.
+type IsErrorTimeouts []IsErrorTimeout
+
+// IsErrorTimeout returns if the error is retryable if any of the checks in
+// the list return a value other than unknown.
+func (ts IsErrorTimeouts) IsErrorTimeout(err error) aws.Ternary {
+	for _, t := range ts {
+		if v := t.IsErrorTimeout(err); v != aws.UnknownTernary {
+			return v
+		}
+	}
+	return aws.UnknownTernary
+}
+
+// IsErrorTimeoutFunc wraps a function with the IsErrorTimeout interface.
+type IsErrorTimeoutFunc func(error) aws.Ternary
+
+// IsErrorTimeout returns if the error is retryable.
+func (fn IsErrorTimeoutFunc) IsErrorTimeout(err error) aws.Ternary {
+	return fn(err)
+}
+
+// TimeouterError provides the IsErrorTimeout implementation for determining if
+// an error is a timeout based on type with the Timeout method.
+type TimeouterError struct{}
+
+// IsErrorTimeout returns if the error is a timeout error.
+func (t TimeouterError) IsErrorTimeout(err error) aws.Ternary {
+	var v interface{ Timeout() bool }
+
+	if !errors.As(err, &v) {
+		return aws.UnknownTernary
+	}
+
+	return aws.BoolTernary(v.Timeout())
+}