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package xfer // import "github.com/docker/docker/distribution/xfer"
import (
"context"
"errors"
"time"
"github.com/containerd/log"
"github.com/docker/distribution"
"github.com/docker/docker/layer"
"github.com/docker/docker/pkg/progress"
)
const maxUploadAttempts = 5
// LayerUploadManager provides task management and progress reporting for
// uploads.
type LayerUploadManager struct {
tm *transferManager
waitDuration time.Duration
}
// SetConcurrency sets the max concurrent uploads for each push
func (lum *LayerUploadManager) SetConcurrency(concurrency int) {
lum.tm.setConcurrency(concurrency)
}
// NewLayerUploadManager returns a new LayerUploadManager.
func NewLayerUploadManager(concurrencyLimit int, options ...func(*LayerUploadManager)) *LayerUploadManager {
manager := LayerUploadManager{
tm: newTransferManager(concurrencyLimit),
waitDuration: time.Second,
}
for _, option := range options {
option(&manager)
}
return &manager
}
type uploadTransfer struct {
transfer
remoteDescriptor distribution.Descriptor
err error
}
// An UploadDescriptor references a layer that may need to be uploaded.
type UploadDescriptor interface {
// Key returns the key used to deduplicate uploads.
Key() string
// ID returns the ID for display purposes.
ID() string
// DiffID should return the DiffID for this layer.
DiffID() layer.DiffID
// Upload is called to perform the Upload.
Upload(ctx context.Context, progressOutput progress.Output) (distribution.Descriptor, error)
// SetRemoteDescriptor provides the distribution.Descriptor that was
// returned by Upload. This descriptor is not to be confused with
// the UploadDescriptor interface, which is used for internally
// identifying layers that are being uploaded.
SetRemoteDescriptor(descriptor distribution.Descriptor)
}
// Upload is a blocking function which ensures the listed layers are present on
// the remote registry. It uses the string returned by the Key method to
// deduplicate uploads.
func (lum *LayerUploadManager) Upload(ctx context.Context, layers []UploadDescriptor, progressOutput progress.Output) error {
var (
uploads []*uploadTransfer
dedupDescriptors = make(map[string]*uploadTransfer)
)
for _, descriptor := range layers {
progress.Update(progressOutput, descriptor.ID(), "Preparing")
key := descriptor.Key()
if _, present := dedupDescriptors[key]; present {
continue
}
xferFunc := lum.makeUploadFunc(descriptor)
upload, watcher := lum.tm.transfer(descriptor.Key(), xferFunc, progressOutput)
defer upload.release(watcher)
uploads = append(uploads, upload.(*uploadTransfer))
dedupDescriptors[key] = upload.(*uploadTransfer)
}
for _, upload := range uploads {
select {
case <-ctx.Done():
return ctx.Err()
case <-upload.transfer.done():
if upload.err != nil {
return upload.err
}
}
}
for _, l := range layers {
l.SetRemoteDescriptor(dedupDescriptors[l.Key()].remoteDescriptor)
}
return nil
}
func (lum *LayerUploadManager) makeUploadFunc(descriptor UploadDescriptor) doFunc {
return func(progressChan chan<- progress.Progress, start <-chan struct{}, inactive chan<- struct{}) transfer {
u := &uploadTransfer{
transfer: newTransfer(),
}
go func() {
defer func() {
close(progressChan)
}()
progressOutput := progress.ChanOutput(progressChan)
select {
case <-start:
default:
progress.Update(progressOutput, descriptor.ID(), "Waiting")
<-start
}
retries := 0
for {
remoteDescriptor, err := descriptor.Upload(u.transfer.context(), progressOutput)
if err == nil {
u.remoteDescriptor = remoteDescriptor
break
}
// If an error was returned because the context
// was cancelled, we shouldn't retry.
select {
case <-u.transfer.context().Done():
u.err = err
return
default:
}
retries++
if _, isDNR := err.(DoNotRetry); isDNR || retries == maxUploadAttempts {
log.G(context.TODO()).Errorf("Upload failed: %v", err)
u.err = err
return
}
log.G(context.TODO()).Errorf("Upload failed, retrying: %v", err)
delay := retries * 5
ticker := time.NewTicker(lum.waitDuration)
selectLoop:
for {
progress.Updatef(progressOutput, descriptor.ID(), "Retrying in %d second%s", delay, (map[bool]string{true: "s"})[delay != 1])
select {
case <-ticker.C:
delay--
if delay == 0 {
ticker.Stop()
break selectLoop
}
case <-u.transfer.context().Done():
ticker.Stop()
u.err = errors.New("upload cancelled during retry delay")
return
}
}
}
}()
return u
}
}
|
