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package request
import (
"net"
"net/url"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
)
// Retryer provides the interface drive the SDK's request retry behavior. The
// Retryer implementation is responsible for implementing exponential backoff,
// and determine if a request API error should be retried.
//
// client.DefaultRetryer is the SDK's default implementation of the Retryer. It
// uses the Request.IsErrorRetryable and Request.IsErrorThrottle methods to
// determine if the request is retried.
type Retryer interface {
// RetryRules return the retry delay that should be used by the SDK before
// making another request attempt for the failed request.
RetryRules(*Request) time.Duration
// ShouldRetry returns if the failed request is retryable.
//
// Implementations may consider request attempt count when determining if a
// request is retryable, but the SDK will use MaxRetries to limit the
// number of attempts a request are made.
ShouldRetry(*Request) bool
// MaxRetries is the number of times a request may be retried before
// failing.
MaxRetries() int
}
// WithRetryer sets a Retryer value to the given Config returning the Config
// value for chaining. The value must not be nil.
func WithRetryer(cfg *aws.Config, retryer Retryer) *aws.Config {
if retryer == nil {
if cfg.Logger != nil {
cfg.Logger.Log("ERROR: Request.WithRetryer called with nil retryer. Replacing with retry disabled Retryer.")
}
retryer = noOpRetryer{}
}
cfg.Retryer = retryer
return cfg
}
// noOpRetryer is a internal no op retryer used when a request is created
// without a retryer.
//
// Provides a retryer that performs no retries.
// It should be used when we do not want retries to be performed.
type noOpRetryer struct{}
// MaxRetries returns the number of maximum returns the service will use to make
// an individual API; For NoOpRetryer the MaxRetries will always be zero.
func (d noOpRetryer) MaxRetries() int {
return 0
}
// ShouldRetry will always return false for NoOpRetryer, as it should never retry.
func (d noOpRetryer) ShouldRetry(_ *Request) bool {
return false
}
// RetryRules returns the delay duration before retrying this request again;
// since NoOpRetryer does not retry, RetryRules always returns 0.
func (d noOpRetryer) RetryRules(_ *Request) time.Duration {
return 0
}
// retryableCodes is a collection of service response codes which are retry-able
// without any further action.
var retryableCodes = map[string]struct{}{
ErrCodeRequestError: {},
"RequestTimeout": {},
ErrCodeResponseTimeout: {},
"RequestTimeoutException": {}, // Glacier's flavor of RequestTimeout
}
var throttleCodes = map[string]struct{}{
"ProvisionedThroughputExceededException": {},
"ThrottledException": {}, // SNS, XRay, ResourceGroupsTagging API
"Throttling": {},
"ThrottlingException": {},
"RequestLimitExceeded": {},
"RequestThrottled": {},
"RequestThrottledException": {},
"TooManyRequestsException": {}, // Lambda functions
"PriorRequestNotComplete": {}, // Route53
"TransactionInProgressException": {},
"EC2ThrottledException": {}, // EC2
}
// credsExpiredCodes is a collection of error codes which signify the credentials
// need to be refreshed. Expired tokens require refreshing of credentials, and
// resigning before the request can be retried.
var credsExpiredCodes = map[string]struct{}{
"ExpiredToken": {},
"ExpiredTokenException": {},
"RequestExpired": {}, // EC2 Only
}
func isCodeThrottle(code string) bool {
_, ok := throttleCodes[code]
return ok
}
func isCodeRetryable(code string) bool {
if _, ok := retryableCodes[code]; ok {
return true
}
return isCodeExpiredCreds(code)
}
func isCodeExpiredCreds(code string) bool {
_, ok := credsExpiredCodes[code]
return ok
}
var validParentCodes = map[string]struct{}{
ErrCodeSerialization: {},
ErrCodeRead: {},
}
func isNestedErrorRetryable(parentErr awserr.Error) bool {
if parentErr == nil {
return false
}
if _, ok := validParentCodes[parentErr.Code()]; !ok {
return false
}
err := parentErr.OrigErr()
if err == nil {
return false
}
if aerr, ok := err.(awserr.Error); ok {
return isCodeRetryable(aerr.Code())
}
if t, ok := err.(temporary); ok {
return t.Temporary() || isErrConnectionReset(err)
}
return isErrConnectionReset(err)
}
// IsErrorRetryable returns whether the error is retryable, based on its Code.
// Returns false if error is nil.
func IsErrorRetryable(err error) bool {
if err == nil {
return false
}
return shouldRetryError(err)
}
type temporary interface {
Temporary() bool
}
func shouldRetryError(origErr error) bool {
switch err := origErr.(type) {
case awserr.Error:
if err.Code() == CanceledErrorCode {
return false
}
if isNestedErrorRetryable(err) {
return true
}
origErr := err.OrigErr()
var shouldRetry bool
if origErr != nil {
shouldRetry = shouldRetryError(origErr)
if err.Code() == ErrCodeRequestError && !shouldRetry {
return false
}
}
if isCodeRetryable(err.Code()) {
return true
}
return shouldRetry
case *url.Error:
if strings.Contains(err.Error(), "connection refused") {
// 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.
return true
}
// *url.Error only implements Temporary after golang 1.6 but since
// url.Error only wraps the error:
return shouldRetryError(err.Err)
case temporary:
if netErr, ok := err.(*net.OpError); ok && netErr.Op == "dial" {
return true
}
// If the error is temporary, we want to allow continuation of the
// retry process
return err.Temporary() || isErrConnectionReset(origErr)
case nil:
// `awserr.Error.OrigErr()` can be nil, meaning there was an error but
// because we don't know the cause, it is marked as retryable. See
// TestRequest4xxUnretryable for an example.
return true
default:
switch err.Error() {
case "net/http: request canceled",
"net/http: request canceled while waiting for connection":
// known 1.5 error case when an http request is cancelled
return false
}
// here we don't know the error; so we allow a retry.
return true
}
}
// IsErrorThrottle returns whether the error is to be throttled based on its code.
// Returns false if error is nil.
func IsErrorThrottle(err error) bool {
if aerr, ok := err.(awserr.Error); ok && aerr != nil {
return isCodeThrottle(aerr.Code())
}
return false
}
// IsErrorExpiredCreds returns whether the error code is a credential expiry
// error. Returns false if error is nil.
func IsErrorExpiredCreds(err error) bool {
if aerr, ok := err.(awserr.Error); ok && aerr != nil {
return isCodeExpiredCreds(aerr.Code())
}
return false
}
// IsErrorRetryable returns whether the error is retryable, based on its Code.
// Returns false if the request has no Error set.
//
// Alias for the utility function IsErrorRetryable
func (r *Request) IsErrorRetryable() bool {
if isErrCode(r.Error, r.RetryErrorCodes) {
return true
}
// HTTP response status code 501 should not be retried.
// 501 represents Not Implemented which means the request method is not
// supported by the server and cannot be handled.
if r.HTTPResponse != nil {
// HTTP response status code 500 represents internal server error and
// should be retried without any throttle.
if r.HTTPResponse.StatusCode == 500 {
return true
}
}
return IsErrorRetryable(r.Error)
}
// IsErrorThrottle returns whether the error is to be throttled based on its
// code. Returns false if the request has no Error set.
//
// Alias for the utility function IsErrorThrottle
func (r *Request) IsErrorThrottle() bool {
if isErrCode(r.Error, r.ThrottleErrorCodes) {
return true
}
if r.HTTPResponse != nil {
switch r.HTTPResponse.StatusCode {
case
429, // error caused due to too many requests
502, // Bad Gateway error should be throttled
503, // caused when service is unavailable
504: // error occurred due to gateway timeout
return true
}
}
return IsErrorThrottle(r.Error)
}
func isErrCode(err error, codes []string) bool {
if aerr, ok := err.(awserr.Error); ok && aerr != nil {
for _, code := range codes {
if code == aerr.Code() {
return true
}
}
}
return false
}
// IsErrorExpired returns whether the error code is a credential expiry error.
// Returns false if the request has no Error set.
//
// Alias for the utility function IsErrorExpiredCreds
func (r *Request) IsErrorExpired() bool {
return IsErrorExpiredCreds(r.Error)
}