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pusher.go
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pusher.go
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/*
Copyright The containerd Authors.
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 docker
import (
"context"
"io"
"io/ioutil"
"net/http"
"path"
"strings"
"time"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/remotes"
digest "github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
type dockerPusher struct {
*dockerBase
tag string
// TODO: namespace tracker
tracker StatusTracker
}
func (p dockerPusher) Push(ctx context.Context, desc ocispec.Descriptor) (content.Writer, error) {
ctx, err := contextWithRepositoryScope(ctx, p.refspec, true)
if err != nil {
return nil, err
}
ref := remotes.MakeRefKey(ctx, desc)
status, err := p.tracker.GetStatus(ref)
if err == nil {
if status.Offset == status.Total {
return nil, errors.Wrapf(errdefs.ErrAlreadyExists, "ref %v", ref)
}
// TODO: Handle incomplete status
} else if !errdefs.IsNotFound(err) {
return nil, errors.Wrap(err, "failed to get status")
}
var (
isManifest bool
existCheck string
)
switch desc.MediaType {
case images.MediaTypeDockerSchema2Manifest, images.MediaTypeDockerSchema2ManifestList,
ocispec.MediaTypeImageManifest, ocispec.MediaTypeImageIndex:
isManifest = true
if p.tag == "" {
existCheck = path.Join("manifests", desc.Digest.String())
} else {
existCheck = path.Join("manifests", p.tag)
}
default:
existCheck = path.Join("blobs", desc.Digest.String())
}
req, err := http.NewRequest(http.MethodHead, p.url(existCheck), nil)
if err != nil {
return nil, err
}
req.Header.Set("Accept", strings.Join([]string{desc.MediaType, `*`}, ", "))
resp, err := p.doRequestWithRetries(ctx, req, nil)
if err != nil {
if errors.Cause(err) != ErrInvalidAuthorization {
return nil, err
}
log.G(ctx).WithError(err).Debugf("Unable to check existence, continuing with push")
} else {
if resp.StatusCode == http.StatusOK {
var exists bool
if isManifest && p.tag != "" {
dgstHeader := digest.Digest(resp.Header.Get("Docker-Content-Digest"))
if dgstHeader == desc.Digest {
exists = true
}
} else {
exists = true
}
if exists {
p.tracker.SetStatus(ref, Status{
Status: content.Status{
Ref: ref,
// TODO: Set updated time?
},
})
return nil, errors.Wrapf(errdefs.ErrAlreadyExists, "content %v on remote", desc.Digest)
}
} else if resp.StatusCode != http.StatusNotFound {
// TODO: log error
return nil, errors.Errorf("unexpected response: %s", resp.Status)
}
}
// TODO: Lookup related objects for cross repository push
if isManifest {
var putPath string
if p.tag != "" {
putPath = path.Join("manifests", p.tag)
} else {
putPath = path.Join("manifests", desc.Digest.String())
}
req, err = http.NewRequest(http.MethodPut, p.url(putPath), nil)
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", desc.MediaType)
} else {
// TODO: Do monolithic upload if size is small
// Start upload request
req, err = http.NewRequest(http.MethodPost, p.url("blobs", "uploads")+"/", nil)
if err != nil {
return nil, err
}
resp, err := p.doRequestWithRetries(ctx, req, nil)
if err != nil {
return nil, err
}
switch resp.StatusCode {
case http.StatusOK, http.StatusAccepted, http.StatusNoContent:
default:
// TODO: log error
return nil, errors.Errorf("unexpected response: %s", resp.Status)
}
location := resp.Header.Get("Location")
// Support paths without host in location
if strings.HasPrefix(location, "/") {
// Support location string containing path and query
qmIndex := strings.Index(location, "?")
if qmIndex > 0 {
u := p.base
u.Path = location[:qmIndex]
u.RawQuery = location[qmIndex+1:]
location = u.String()
} else {
u := p.base
u.Path = location
location = u.String()
}
}
req, err = http.NewRequest(http.MethodPut, location, nil)
if err != nil {
return nil, err
}
q := req.URL.Query()
q.Add("digest", desc.Digest.String())
req.URL.RawQuery = q.Encode()
}
p.tracker.SetStatus(ref, Status{
Status: content.Status{
Ref: ref,
Total: desc.Size,
Expected: desc.Digest,
StartedAt: time.Now(),
},
})
// TODO: Support chunked upload
pr, pw := io.Pipe()
respC := make(chan *http.Response, 1)
req.Body = ioutil.NopCloser(pr)
req.ContentLength = desc.Size
go func() {
defer close(respC)
resp, err = p.doRequest(ctx, req)
if err != nil {
pr.CloseWithError(err)
return
}
switch resp.StatusCode {
case http.StatusOK, http.StatusCreated, http.StatusNoContent:
default:
// TODO: log error
pr.CloseWithError(errors.Errorf("unexpected response: %s", resp.Status))
}
respC <- resp
}()
return &pushWriter{
base: p.dockerBase,
ref: ref,
pipe: pw,
responseC: respC,
isManifest: isManifest,
expected: desc.Digest,
tracker: p.tracker,
}, nil
}
type pushWriter struct {
base *dockerBase
ref string
pipe *io.PipeWriter
responseC <-chan *http.Response
isManifest bool
expected digest.Digest
tracker StatusTracker
}
func (pw *pushWriter) Write(p []byte) (n int, err error) {
status, err := pw.tracker.GetStatus(pw.ref)
if err != nil {
return n, err
}
n, err = pw.pipe.Write(p)
status.Offset += int64(n)
status.UpdatedAt = time.Now()
pw.tracker.SetStatus(pw.ref, status)
return
}
func (pw *pushWriter) Close() error {
return pw.pipe.Close()
}
func (pw *pushWriter) Status() (content.Status, error) {
status, err := pw.tracker.GetStatus(pw.ref)
if err != nil {
return content.Status{}, err
}
return status.Status, nil
}
func (pw *pushWriter) Digest() digest.Digest {
// TODO: Get rid of this function?
return pw.expected
}
func (pw *pushWriter) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error {
// Check whether read has already thrown an error
if _, err := pw.pipe.Write([]byte{}); err != nil && err != io.ErrClosedPipe {
return errors.Wrap(err, "pipe error before commit")
}
if err := pw.pipe.Close(); err != nil {
return err
}
// TODO: Update status to determine committing
// TODO: timeout waiting for response
resp := <-pw.responseC
if resp == nil {
return errors.New("no response")
}
// 201 is specified return status, some registries return
// 200 or 204.
switch resp.StatusCode {
case http.StatusOK, http.StatusCreated, http.StatusNoContent:
default:
return errors.Errorf("unexpected status: %s", resp.Status)
}
status, err := pw.tracker.GetStatus(pw.ref)
if err != nil {
return errors.Wrap(err, "failed to get status")
}
if size > 0 && size != status.Offset {
return errors.Errorf("unxpected size %d, expected %d", status.Offset, size)
}
if expected == "" {
expected = status.Expected
}
actual, err := digest.Parse(resp.Header.Get("Docker-Content-Digest"))
if err != nil {
return errors.Wrap(err, "invalid content digest in response")
}
if actual != expected {
return errors.Errorf("got digest %s, expected %s", actual, expected)
}
return nil
}
func (pw *pushWriter) Truncate(size int64) error {
// TODO: if blob close request and start new request at offset
// TODO: always error on manifest
return errors.New("cannot truncate remote upload")
}