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Adds functional options arguments to the Blobs Create method

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Removes the Mount operation and instead implements this behavior as part
of Create a From option is provided, which in turn returns a rich
ErrBlobMounted indicating that a blob upload session was not initiated,
but instead the blob was mounted from another repository

Signed-off-by: Brian Bland <brian.bland@docker.com>
This commit is contained in:
Brian Bland 2016-01-13 11:44:42 -08:00
parent 66b492e69f
commit 36023174db
7 changed files with 146 additions and 93 deletions
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79
docs/client/repository.go
View file

@ -10,7 +10,6 @@ import (
"net/http"
"net/url"
"strconv"
"sync"
"time"
"github.com/docker/distribution"
@ -19,6 +18,7 @@ import (
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/api/v2"
"github.com/docker/distribution/registry/client/transport"
"github.com/docker/distribution/registry/storage"
"github.com/docker/distribution/registry/storage/cache"
"github.com/docker/distribution/registry/storage/cache/memory"
)
@ -500,9 +500,6 @@ type blobs struct {
statter distribution.BlobDescriptorService
distribution.BlobDeleter
cacheLock sync.Mutex
cachedBlobUpload distribution.BlobWriter
}
func sanitizeLocation(location, base string) (string, error) {
@ -576,18 +573,23 @@ func (bs *blobs) Put(ctx context.Context, mediaType string, p []byte) (distribut
return writer.Commit(ctx, desc)
}
func (bs *blobs) Create(ctx context.Context) (distribution.BlobWriter, error) {
bs.cacheLock.Lock()
if bs.cachedBlobUpload != nil {
upload := bs.cachedBlobUpload
bs.cachedBlobUpload = nil
bs.cacheLock.Unlock()
func (bs *blobs) Create(ctx context.Context, options ...distribution.BlobCreateOption) (distribution.BlobWriter, error) {
var opts storage.CreateOptions
return upload, nil
for _, option := range options {
err := option.Apply(&opts)
if err != nil {
return nil, err
}
}
bs.cacheLock.Unlock()
u, err := bs.ub.BuildBlobUploadURL(bs.name)
var values []url.Values
if opts.Mount.ShouldMount {
values = append(values, url.Values{"from": {opts.Mount.From.Name()}, "mount": {opts.Mount.From.Digest().String()}})
}
u, err := bs.ub.BuildBlobUploadURL(bs.name, values...)
if err != nil {
return nil, err
}
@ -598,7 +600,14 @@ func (bs *blobs) Create(ctx context.Context) (distribution.BlobWriter, error) {
}
defer resp.Body.Close()
if SuccessStatus(resp.StatusCode) {
switch resp.StatusCode {
case http.StatusCreated:
desc, err := bs.statter.Stat(ctx, opts.Mount.From.Digest())
if err != nil {
return nil, err
}
return nil, distribution.ErrBlobMounted{From: opts.Mount.From, Descriptor: desc}
case http.StatusAccepted:
// TODO(dmcgowan): Check for invalid UUID
uuid := resp.Header.Get("Docker-Upload-UUID")
location, err := sanitizeLocation(resp.Header.Get("Location"), u)
@ -613,53 +622,15 @@ func (bs *blobs) Create(ctx context.Context) (distribution.BlobWriter, error) {
startedAt: time.Now(),
location: location,
}, nil
default:
return nil, HandleErrorResponse(resp)
}
return nil, HandleErrorResponse(resp)
}
func (bs *blobs) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
panic("not implemented")
}
func (bs *blobs) Mount(ctx context.Context, sourceRepo string, dgst digest.Digest) (distribution.Descriptor, error) {
u, err := bs.ub.BuildBlobUploadURL(bs.name, url.Values{"from": {sourceRepo}, "mount": {dgst.String()}})
if err != nil {
return distribution.Descriptor{}, err
}
resp, err := bs.client.Post(u, "", nil)
if err != nil {
return distribution.Descriptor{}, err
}
defer resp.Body.Close()
switch resp.StatusCode {
case http.StatusCreated:
return bs.Stat(ctx, dgst)
case http.StatusAccepted:
// Triggered a blob upload (legacy behavior), so cache the creation info
uuid := resp.Header.Get("Docker-Upload-UUID")
location, err := sanitizeLocation(resp.Header.Get("Location"), u)
if err != nil {
return distribution.Descriptor{}, err
}
bs.cacheLock.Lock()
bs.cachedBlobUpload = &httpBlobUpload{
statter: bs.statter,
client: bs.client,
uuid: uuid,
startedAt: time.Now(),
location: location,
}
bs.cacheLock.Unlock()
return distribution.Descriptor{}, HandleErrorResponse(resp)
default:
return distribution.Descriptor{}, HandleErrorResponse(resp)
}
}
func (bs *blobs) Delete(ctx context.Context, dgst digest.Digest) error {
return bs.statter.Clear(ctx, dgst)
}

29
docs/client/repository_test.go
View file

@ -18,7 +18,9 @@ import (
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/api/errcode"
"github.com/docker/distribution/registry/storage"
"github.com/docker/distribution/testutil"
"github.com/docker/distribution/uuid"
"github.com/docker/libtrust"
@ -471,6 +473,16 @@ func TestBlobMount(t *testing.T) {
var m testutil.RequestResponseMap
repo := "test.example.com/uploadrepo"
sourceRepo := "test.example.com/sourcerepo"
namedRef, err := reference.ParseNamed(sourceRepo)
if err != nil {
t.Fatal(err)
}
canonicalRef, err := reference.WithDigest(namedRef, dgst)
if err != nil {
t.Fatal(err)
}
m = append(m, testutil.RequestResponseMapping{
Request: testutil.Request{
Method: "POST",
@ -511,13 +523,20 @@ func TestBlobMount(t *testing.T) {
l := r.Blobs(ctx)
stat, err := l.Mount(ctx, sourceRepo, dgst)
if err != nil {
t.Fatal(err)
bw, err := l.Create(ctx, storage.WithMountFrom(canonicalRef))
if bw != nil {
t.Fatalf("Expected blob writer to be nil, was %v", bw)
}
if stat.Digest != dgst {
t.Fatalf("Unexpected digest: %s, expected %s", stat.Digest, dgst)
if ebm, ok := err.(distribution.ErrBlobMounted); ok {
if ebm.From.Digest() != dgst {
t.Fatalf("Unexpected digest: %s, expected %s", ebm.From.Digest(), dgst)
}
if ebm.From.Name() != sourceRepo {
t.Fatalf("Unexpected from: %s, expected %s", ebm.From.Name(), sourceRepo)
}
} else {
t.Fatalf("Unexpected error: %v, expected an ErrBlobMounted", err)
}
}

42
docs/handlers/blobupload.go
View file

@ -9,8 +9,10 @@ import (
"github.com/docker/distribution"
ctxu "github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/api/errcode"
"github.com/docker/distribution/registry/api/v2"
"github.com/docker/distribution/registry/storage"
"github.com/gorilla/handlers"
)
@ -118,19 +120,27 @@ type blobUploadHandler struct {
// StartBlobUpload begins the blob upload process and allocates a server-side
// blob writer session, optionally mounting the blob from a separate repository.
func (buh *blobUploadHandler) StartBlobUpload(w http.ResponseWriter, r *http.Request) {
var options []distribution.BlobCreateOption
fromRepo := r.FormValue("from")
mountDigest := r.FormValue("mount")
if mountDigest != "" && fromRepo != "" {
buh.mountBlob(w, fromRepo, mountDigest)
return
opt, err := buh.createBlobMountOption(fromRepo, mountDigest)
if err != nil {
options = append(options, opt)
}
}
blobs := buh.Repository.Blobs(buh)
upload, err := blobs.Create(buh)
upload, err := blobs.Create(buh, options...)
if err != nil {
if err == distribution.ErrUnsupported {
if ebm, ok := err.(distribution.ErrBlobMounted); ok {
if err := buh.writeBlobCreatedHeaders(w, ebm.Descriptor); err != nil {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
}
} else if err == distribution.ErrUnsupported {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnsupported)
} else {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
@ -339,27 +349,23 @@ func (buh *blobUploadHandler) blobUploadResponse(w http.ResponseWriter, r *http.
// mountBlob attempts to mount a blob from another repository by its digest. If
// successful, the blob is linked into the blob store and 201 Created is
// returned with the canonical url of the blob.
func (buh *blobUploadHandler) mountBlob(w http.ResponseWriter, fromRepo, mountDigest string) {
func (buh *blobUploadHandler) createBlobMountOption(fromRepo, mountDigest string) (distribution.BlobCreateOption, error) {
dgst, err := digest.ParseDigest(mountDigest)
if err != nil {
buh.Errors = append(buh.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
return
return nil, err
}
blobs := buh.Repository.Blobs(buh)
desc, err := blobs.Mount(buh, fromRepo, dgst)
ref, err := reference.ParseNamed(fromRepo)
if err != nil {
if err == distribution.ErrBlobUnknown {
buh.Errors = append(buh.Errors, v2.ErrorCodeBlobUnknown.WithDetail(dgst))
} else {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
}
return
return nil, err
}
if err := buh.writeBlobCreatedHeaders(w, desc); err != nil {
buh.Errors = append(buh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
canonical, err := reference.WithDigest(ref, dgst)
if err != nil {
return nil, err
}
return storage.WithMountFrom(canonical), nil
}
// writeBlobCreatedHeaders writes the standard headers describing a newly

2
docs/proxy/proxyblobstore.go
View file

@ -161,7 +161,7 @@ func (pbs *proxyBlobStore) Put(ctx context.Context, mediaType string, p []byte)
return distribution.Descriptor{}, distribution.ErrUnsupported
}
func (pbs *proxyBlobStore) Create(ctx context.Context) (distribution.BlobWriter, error) {
func (pbs *proxyBlobStore) Create(ctx context.Context, options ...distribution.BlobCreateOption) (distribution.BlobWriter, error) {
return nil, distribution.ErrUnsupported
}

12
docs/proxy/proxyblobstore_test.go
View file

@ -42,12 +42,12 @@ func (sbs statsBlobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte,
return sbs.blobs.Get(ctx, dgst)
}
func (sbs statsBlobStore) Create(ctx context.Context) (distribution.BlobWriter, error) {
func (sbs statsBlobStore) Create(ctx context.Context, options ...distribution.BlobCreateOption) (distribution.BlobWriter, error) {
sbsMu.Lock()
sbs.stats["create"]++
sbsMu.Unlock()
return sbs.blobs.Create(ctx)
return sbs.blobs.Create(ctx, options...)
}
func (sbs statsBlobStore) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
@ -58,14 +58,6 @@ func (sbs statsBlobStore) Resume(ctx context.Context, id string) (distribution.B
return sbs.blobs.Resume(ctx, id)
}
func (sbs statsBlobStore) Mount(ctx context.Context, sourceRepo string, dgst digest.Digest) (distribution.Descriptor, error) {
sbsMu.Lock()
sbs.stats["mount"]++
sbsMu.Unlock()
return sbs.blobs.Mount(ctx, sourceRepo, dgst)
}
func (sbs statsBlobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
sbsMu.Lock()
sbs.stats["open"]++

21
docs/storage/blob_test.go
View file

@ -12,6 +12,7 @@ import (
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/storage/cache/memory"
"github.com/docker/distribution/registry/storage/driver/inmemory"
"github.com/docker/distribution/testutil"
@ -377,13 +378,27 @@ func TestBlobMount(t *testing.T) {
t.Fatalf("unexpected non-error stating unmounted blob: %v", desc)
}
mountDesc, err := bs.Mount(ctx, sourceRepository.Name(), desc.Digest)
namedRef, err := reference.ParseNamed(sourceRepository.Name())
if err != nil {
t.Fatal(err)
}
canonicalRef, err := reference.WithDigest(namedRef, desc.Digest)
if err != nil {
t.Fatal(err)
}
bw, err := bs.Create(ctx, WithMountFrom(canonicalRef))
if bw != nil {
t.Fatal("unexpected blobwriter returned from Create call, should mount instead")
}
ebm, ok := err.(distribution.ErrBlobMounted)
if !ok {
t.Fatalf("unexpected error mounting layer: %v", err)
}
if mountDesc != desc {
t.Fatalf("descriptors not equal: %v != %v", mountDesc, desc)
if ebm.Descriptor != desc {
t.Fatalf("descriptors not equal: %v != %v", ebm.Descriptor, desc)
}
// Test for existence.

54
docs/storage/linkedblobstore.go
View file

@ -1,12 +1,14 @@
package storage
import (
"fmt"
"net/http"
"time"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/storage/driver"
"github.com/docker/distribution/uuid"
)
@ -95,10 +97,58 @@ func (lbs *linkedBlobStore) Put(ctx context.Context, mediaType string, p []byte)
return desc, lbs.linkBlob(ctx, desc)
}
// CreateOptions is a collection of blob creation modifiers relevant to general
// blob storage intended to be configured by the BlobCreateOption.Apply method.
type CreateOptions struct {
Mount struct {
ShouldMount bool
From reference.Canonical
}
}
type optionFunc func(interface{}) error
func (f optionFunc) Apply(v interface{}) error {
return f(v)
}
// WithMountFrom returns a BlobCreateOption which designates that the blob should be
// mounted from the given canonical reference.
func WithMountFrom(ref reference.Canonical) distribution.BlobCreateOption {
return optionFunc(func(v interface{}) error {
opts, ok := v.(*CreateOptions)
if !ok {
return fmt.Errorf("unexpected options type: %T", v)
}
opts.Mount.ShouldMount = true
opts.Mount.From = ref
return nil
})
}
// Writer begins a blob write session, returning a handle.
func (lbs *linkedBlobStore) Create(ctx context.Context) (distribution.BlobWriter, error) {
func (lbs *linkedBlobStore) Create(ctx context.Context, options ...distribution.BlobCreateOption) (distribution.BlobWriter, error) {
context.GetLogger(ctx).Debug("(*linkedBlobStore).Writer")
var opts CreateOptions
for _, option := range options {
err := option.Apply(&opts)
if err != nil {
return nil, err
}
}
if opts.Mount.ShouldMount {
desc, err := lbs.mount(ctx, opts.Mount.From.Name(), opts.Mount.From.Digest())
if err == nil {
// Mount successful, no need to initiate an upload session
return nil, distribution.ErrBlobMounted{From: opts.Mount.From, Descriptor: desc}
}
}
uuid := uuid.Generate().String()
startedAt := time.Now().UTC()
@ -186,7 +236,7 @@ func (lbs *linkedBlobStore) Delete(ctx context.Context, dgst digest.Digest) erro
return nil
}
func (lbs *linkedBlobStore) Mount(ctx context.Context, sourceRepo string, dgst digest.Digest) (distribution.Descriptor, error) {
func (lbs *linkedBlobStore) mount(ctx context.Context, sourceRepo string, dgst digest.Digest) (distribution.Descriptor, error) {
repo, err := lbs.registry.Repository(ctx, sourceRepo)
if err != nil {
return distribution.Descriptor{}, err