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// Copyright 2018 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package transport
import (
"net/http"
"time"
"github.com/google/go-containerregistry/internal/retry"
)
// Sleep for 0.1 then 0.3 seconds. This should cover networking blips.
var defaultBackoff = retry.Backoff{
Duration: 100 * time.Millisecond,
Factor: 3.0,
Jitter: 0.1,
Steps: 3,
}
var _ http.RoundTripper = (*retryTransport)(nil)
// retryTransport wraps a RoundTripper and retries temporary network errors.
type retryTransport struct {
inner http.RoundTripper
backoff retry.Backoff
predicate retry.Predicate
codes []int
}
// Option is a functional option for retryTransport.
type Option func(*options)
type options struct {
backoff retry.Backoff
predicate retry.Predicate
codes []int
}
// Backoff is an alias of retry.Backoff to expose this configuration option to consumers of this lib
type Backoff = retry.Backoff
// WithRetryBackoff sets the backoff for retry operations.
func WithRetryBackoff(backoff Backoff) Option {
return func(o *options) {
o.backoff = backoff
}
}
// WithRetryPredicate sets the predicate for retry operations.
func WithRetryPredicate(predicate func(error) bool) Option {
return func(o *options) {
o.predicate = predicate
}
}
// WithRetryStatusCodes sets which http response codes will be retried.
func WithRetryStatusCodes(codes ...int) Option {
return func(o *options) {
o.codes = codes
}
}
// NewRetry returns a transport that retries errors.
func NewRetry(inner http.RoundTripper, opts ...Option) http.RoundTripper {
o := &options{
backoff: defaultBackoff,
predicate: retry.IsTemporary,
}
for _, opt := range opts {
opt(o)
}
return &retryTransport{
inner: inner,
backoff: o.backoff,
predicate: o.predicate,
codes: o.codes,
}
}
func (t *retryTransport) RoundTrip(in *http.Request) (out *http.Response, err error) {
roundtrip := func() error {
out, err = t.inner.RoundTrip(in)
if !retry.Ever(in.Context()) {
return nil
}
if out != nil {
for _, code := range t.codes {
if out.StatusCode == code {
return CheckError(out)
}
}
}
return err
}
retry.Retry(roundtrip, t.predicate, t.backoff)
return
}
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