forked from AliyunContainerService/pouch
/
image.go
332 lines (285 loc) · 8.32 KB
/
image.go
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package ctrd
import (
"context"
"fmt"
"io"
"net/http"
"sync"
"time"
"github.com/alibaba/pouch/apis/types"
"github.com/alibaba/pouch/pkg/jsonstream"
"github.com/containerd/containerd"
"github.com/containerd/containerd/errdefs"
ctrdmetaimages "github.com/containerd/containerd/images"
"github.com/containerd/containerd/leases"
"github.com/containerd/containerd/remotes"
"github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// CreateImageReference creates the image in the meta data in the containerd.
func (c *Client) CreateImageReference(ctx context.Context, img ctrdmetaimages.Image) (ctrdmetaimages.Image, error) {
wrapperCli, err := c.Get(ctx)
if err != nil {
return ctrdmetaimages.Image{}, fmt.Errorf("failed to get a containerd grpc client: %v", err)
}
return wrapperCli.client.ImageService().Create(ctx, img)
}
// GetImage returns the containerd's Image.
func (c *Client) GetImage(ctx context.Context, ref string) (containerd.Image, error) {
wrapperCli, err := c.Get(ctx)
if err != nil {
return nil, fmt.Errorf("failed to get a containerd grpc client: %v", err)
}
return wrapperCli.client.GetImage(ctx, ref)
}
// ListImages lists all images.
func (c *Client) ListImages(ctx context.Context, filter ...string) ([]containerd.Image, error) {
wrapperCli, err := c.Get(ctx)
if err != nil {
return nil, fmt.Errorf("failed to get a containerd grpc client: %v", err)
}
return wrapperCli.client.ListImages(ctx, filter...)
}
// RemoveImage deletes an image.
func (c *Client) RemoveImage(ctx context.Context, ref string) error {
wrapperCli, err := c.Get(ctx)
if err != nil {
return fmt.Errorf("failed to get a containerd grpc client: %v", err)
}
if err := wrapperCli.client.ImageService().Delete(ctx, ref); err != nil {
return errors.Wrap(err, "failed to remove image")
}
return nil
}
// ImportImage creates a set of images by tarstream.
//
// NOTE: One tar may have several manifests.
func (c *Client) ImportImage(ctx context.Context, importer ctrdmetaimages.Importer, reader io.Reader) ([]containerd.Image, error) {
wrapperCli, err := c.Get(ctx)
if err != nil {
return nil, fmt.Errorf("failed to get a containerd grpc client: %v", err)
}
// NOTE: The import will store the data into boltdb. But the unpack may
// fail. It is not transaction.
imgs, err := wrapperCli.client.Import(ctx, importer, reader)
if err != nil {
return nil, err
}
for _, img := range imgs {
err = img.Unpack(ctx, containerd.DefaultSnapshotter)
if err != nil {
return nil, err
}
}
return imgs, nil
}
// PullImage downloads an image from the remote repository.
func (c *Client) PullImage(ctx context.Context, ref string, authConfig *types.AuthConfig, stream *jsonstream.JSONStream) (containerd.Image, error) {
wrapperCli, err := c.Get(ctx)
if err != nil {
return nil, fmt.Errorf("failed to get a containerd grpc client: %v", err)
}
resolver, err := resolver(authConfig)
if err != nil {
return nil, err
}
ongoing := newJobs(ref)
options := []containerd.RemoteOpt{
containerd.WithPullUnpack,
containerd.WithSchema1Conversion,
containerd.WithResolver(resolver),
}
handle := func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
if desc.MediaType != ctrdmetaimages.MediaTypeDockerSchema1Manifest {
ongoing.add(desc)
}
return nil, nil
}
options = append(options, containerd.WithImageHandler(ctrdmetaimages.HandlerFunc(handle)))
// fetch progress status, then send to client via out channel.
pctx, cancelProgress := context.WithCancel(ctx)
wait := make(chan struct{})
go func() {
if err := c.fetchProgress(pctx, wrapperCli, ongoing, stream); err != nil {
logrus.Errorf("failed to get pull's progress: %v", err)
}
close(wait)
logrus.Infof("fetch progress exited, ref: %s.", ref)
}()
// start to pull image.
img, err := c.pullImage(ctx, wrapperCli, ref, options)
// cancel fetch progress before handle error.
cancelProgress()
defer stream.Close()
// wait fetch progress to finish.
<-wait
if err != nil {
// Send Error information to client through stream
messages := []ProgressInfo{
{Code: http.StatusInternalServerError, ErrorMessage: err.Error()},
}
stream.WriteObject(messages)
return nil, err
}
logrus.Infof("success to pull image: %s", img.Name())
return img, nil
}
func (c *Client) pullImage(ctx context.Context, wrapperCli *WrapperClient, ref string, options []containerd.RemoteOpt) (containerd.Image, error) {
ctx = leases.WithLease(ctx, wrapperCli.lease.ID())
img, err := wrapperCli.client.Pull(ctx, ref, options...)
if err != nil {
return nil, errors.Wrap(err, "failed to pull image")
}
return img, nil
}
// ProgressInfo represents the status of downloading image.
type ProgressInfo struct {
Ref string
Status string
Offset int64
Total int64
StartedAt time.Time
UpdatedAt time.Time
// For Error handling
Code int // http response code
ErrorMessage string // detail error information
}
func (c *Client) fetchProgress(ctx context.Context, wrapperCli *WrapperClient, ongoing *jobs, stream *jsonstream.JSONStream) error {
var (
ticker = time.NewTicker(100 * time.Millisecond)
cs = wrapperCli.client.ContentStore()
start = time.Now()
progresses = map[string]ProgressInfo{}
done bool
)
defer ticker.Stop()
outer:
for {
select {
case <-ticker.C:
resolved := "resolved"
if !ongoing.isResolved() {
resolved = "resolving"
}
progresses[ongoing.name] = ProgressInfo{
Ref: ongoing.name,
Status: resolved,
}
keys := []string{ongoing.name}
activeSeen := map[string]struct{}{}
if !done {
active, err := cs.ListStatuses(context.TODO(), "")
if err != nil {
logrus.Errorf("failed to list statuses: %v", err)
continue
}
// update status of active entries!
for _, active := range active {
progresses[active.Ref] = ProgressInfo{
Ref: active.Ref,
Status: "downloading",
Offset: active.Offset,
Total: active.Total,
StartedAt: active.StartedAt,
UpdatedAt: active.UpdatedAt,
}
activeSeen[active.Ref] = struct{}{}
}
}
// now, update the items in jobs that are not in active
for _, j := range ongoing.jobs() {
key := remotes.MakeRefKey(ctx, j)
keys = append(keys, key)
if _, ok := activeSeen[key]; ok {
continue
}
status, ok := progresses[key]
if !done && (!ok || status.Status == "downloading") {
info, err := cs.Info(context.TODO(), j.Digest)
if err != nil {
if !errdefs.IsNotFound(err) {
logrus.Errorf("failed to get content info: %v", err)
continue outer
} else {
progresses[key] = ProgressInfo{
Ref: key,
Status: "waiting",
}
}
} else if info.CreatedAt.After(start) {
progresses[key] = ProgressInfo{
Ref: key,
Status: "done",
Offset: info.Size,
Total: info.Size,
UpdatedAt: info.CreatedAt,
}
} else {
progresses[key] = ProgressInfo{
Ref: key,
Status: "exists",
}
}
} else if done {
if ok {
if status.Status != "done" && status.Status != "exists" {
status.Status = "done"
progresses[key] = status
}
} else {
progresses[key] = ProgressInfo{
Ref: key,
Status: "done",
}
}
}
}
var ordered []ProgressInfo
for _, key := range keys {
ordered = append(ordered, progresses[key])
}
stream.WriteObject(ordered)
if done {
return nil
}
case <-ctx.Done():
done = true // allow ui to update once more
}
}
}
type jobs struct {
name string
added map[digest.Digest]struct{}
descs []ocispec.Descriptor
mu sync.Mutex
resolved bool
}
func newJobs(name string) *jobs {
return &jobs{
name: name,
added: map[digest.Digest]struct{}{},
}
}
func (j *jobs) add(desc ocispec.Descriptor) {
j.mu.Lock()
defer j.mu.Unlock()
j.resolved = true
if _, ok := j.added[desc.Digest]; ok {
return
}
j.descs = append(j.descs, desc)
j.added[desc.Digest] = struct{}{}
}
func (j *jobs) jobs() []ocispec.Descriptor {
j.mu.Lock()
defer j.mu.Unlock()
var descs []ocispec.Descriptor
return append(descs, j.descs...)
}
func (j *jobs) isResolved() bool {
j.mu.Lock()
defer j.mu.Unlock()
return j.resolved
}