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Merge pull request #174 from stevvooe/registry-interface-improvements

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Add error return to Repository method on Registry
This commit is contained in:
Stephen Day 2015-02-16 12:05:07 -08:00
commit 61fb9ae16a
14 changed files with 236 additions and 174 deletions
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109
errors.go Normal file
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@ -0,0 +1,109 @@
package distribution
import (
"fmt"
"strings"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
)
var (
// ErrLayerExists returned when layer already exists
ErrLayerExists = fmt.Errorf("layer exists")
// ErrLayerTarSumVersionUnsupported when tarsum is unsupported version.
ErrLayerTarSumVersionUnsupported = fmt.Errorf("unsupported tarsum version")
// ErrLayerUploadUnknown returned when upload is not found.
ErrLayerUploadUnknown = fmt.Errorf("layer upload unknown")
// ErrLayerClosed returned when an operation is attempted on a closed
// Layer or LayerUpload.
ErrLayerClosed = fmt.Errorf("layer closed")
)
// ErrRepositoryUnknown is returned if the named repository is not known by
// the registry.
type ErrRepositoryUnknown struct {
Name string
}
func (err ErrRepositoryUnknown) Error() string {
return fmt.Sprintf("unknown respository name=%s", err.Name)
}
// ErrRepositoryNameInvalid should be used to denote an invalid repository
// name. Reason may set, indicating the cause of invalidity.
type ErrRepositoryNameInvalid struct {
Name string
Reason error
}
func (err ErrRepositoryNameInvalid) Error() string {
return fmt.Sprintf("repository name %q invalid: %v", err.Name, err.Reason)
}
// ErrManifestUnknown is returned if the manifest is not known by the
// registry.
type ErrManifestUnknown struct {
Name string
Tag string
}
func (err ErrManifestUnknown) Error() string {
return fmt.Sprintf("unknown manifest name=%s tag=%s", err.Name, err.Tag)
}
// ErrUnknownManifestRevision is returned when a manifest cannot be found by
// revision within a repository.
type ErrUnknownManifestRevision struct {
Name string
Revision digest.Digest
}
func (err ErrUnknownManifestRevision) Error() string {
return fmt.Sprintf("unknown manifest name=%s revision=%s", err.Name, err.Revision)
}
// ErrManifestUnverified is returned when the registry is unable to verify
// the manifest.
type ErrManifestUnverified struct{}
func (ErrManifestUnverified) Error() string {
return fmt.Sprintf("unverified manifest")
}
// ErrManifestVerification provides a type to collect errors encountered
// during manifest verification. Currently, it accepts errors of all types,
// but it may be narrowed to those involving manifest verification.
type ErrManifestVerification []error
func (errs ErrManifestVerification) Error() string {
var parts []string
for _, err := range errs {
parts = append(parts, err.Error())
}
return fmt.Sprintf("errors verifying manifest: %v", strings.Join(parts, ","))
}
// ErrUnknownLayer returned when layer cannot be found.
type ErrUnknownLayer struct {
FSLayer manifest.FSLayer
}
func (err ErrUnknownLayer) Error() string {
return fmt.Sprintf("unknown layer %v", err.FSLayer.BlobSum)
}
// ErrLayerInvalidDigest returned when tarsum check fails.
type ErrLayerInvalidDigest struct {
Digest digest.Digest
Reason error
}
func (err ErrLayerInvalidDigest) Error() string {
return fmt.Sprintf("invalid digest for referenced layer: %v, %v",
err.Digest, err.Reason)
}

84
layer.go
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@ -1,84 +0,0 @@
package distribution
import (
"fmt"
"io"
"time"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
)
// Layer provides a readable and seekable layer object. Typically,
// implementations are *not* goroutine safe.
type Layer interface {
// http.ServeContent requires an efficient implementation of
// ReadSeeker.Seek(0, os.SEEK_END).
io.ReadSeeker
io.Closer
// Digest returns the unique digest of the blob, which is the tarsum for
// layers.
Digest() digest.Digest
// CreatedAt returns the time this layer was created.
CreatedAt() time.Time
}
// LayerUpload provides a handle for working with in-progress uploads.
// Instances can be obtained from the LayerService.Upload and
// LayerService.Resume.
type LayerUpload interface {
io.WriteSeeker
io.ReaderFrom
io.Closer
// UUID returns the identifier for this upload.
UUID() string
// StartedAt returns the time this layer upload was started.
StartedAt() time.Time
// Finish marks the upload as completed, returning a valid handle to the
// uploaded layer. The digest is validated against the contents of the
// uploaded layer.
Finish(digest digest.Digest) (Layer, error)
// Cancel the layer upload process.
Cancel() error
}
var (
// ErrLayerExists returned when layer already exists
ErrLayerExists = fmt.Errorf("layer exists")
// ErrLayerTarSumVersionUnsupported when tarsum is unsupported version.
ErrLayerTarSumVersionUnsupported = fmt.Errorf("unsupported tarsum version")
// ErrLayerUploadUnknown returned when upload is not found.
ErrLayerUploadUnknown = fmt.Errorf("layer upload unknown")
// ErrLayerClosed returned when an operation is attempted on a closed
// Layer or LayerUpload.
ErrLayerClosed = fmt.Errorf("layer closed")
)
// ErrUnknownLayer returned when layer cannot be found.
type ErrUnknownLayer struct {
FSLayer manifest.FSLayer
}
func (err ErrUnknownLayer) Error() string {
return fmt.Sprintf("unknown layer %v", err.FSLayer.BlobSum)
}
// ErrLayerInvalidDigest returned when tarsum check fails.
type ErrLayerInvalidDigest struct {
Digest digest.Digest
Reason error
}
func (err ErrLayerInvalidDigest) Error() string {
return fmt.Sprintf("invalid digest for referenced layer: %v, %v",
err.Digest, err.Reason)
}

6
notifications/listener_test.go
View File

@ -21,7 +21,11 @@ func TestListener(t *testing.T) {
ops: make(map[string]int),
}
ctx := context.Background()
repository := Listen(registry.Repository(ctx, "foo/bar"), tl)
repository, err := registry.Repository(ctx, "foo/bar")
if err != nil {
t.Fatalf("unexpected error getting repo: %v", err)
}
repository = Listen(repository, tl)
// Now take the registry through a number of operations
checkExerciseRepository(t, repository)

46
registry.go
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@ -1,19 +1,20 @@
package distribution
import (
"io"
"time"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"golang.org/x/net/context"
)
// TODO(stevvooe): These types need to be moved out of the storage package.
// Registry represents a collection of repositories, addressable by name.
type Registry interface {
// Repository should return a reference to the named repository. The
// registry may or may not have the repository but should always return a
// reference.
Repository(ctx context.Context, name string) Repository
Repository(ctx context.Context, name string) (Repository, error)
}
// Repository is a named collection of manifests and layers.
@ -82,3 +83,42 @@ type LayerService interface {
// before proceeding.
Resume(uuid string) (LayerUpload, error)
}
// Layer provides a readable and seekable layer object. Typically,
// implementations are *not* goroutine safe.
type Layer interface {
// http.ServeContent requires an efficient implementation of
// ReadSeeker.Seek(0, os.SEEK_END).
io.ReadSeeker
io.Closer
// Digest returns the unique digest of the blob, which is the tarsum for
// layers.
Digest() digest.Digest
// CreatedAt returns the time this layer was created.
CreatedAt() time.Time
}
// LayerUpload provides a handle for working with in-progress uploads.
// Instances can be obtained from the LayerService.Upload and
// LayerService.Resume.
type LayerUpload interface {
io.WriteSeeker
io.ReaderFrom
io.Closer
// UUID returns the identifier for this upload.
UUID() string
// StartedAt returns the time this layer upload was started.
StartedAt() time.Time
// Finish marks the upload as completed, returning a valid handle to the
// uploaded layer. The digest is validated against the contents of the
// uploaded layer.
Finish(digest digest.Digest) (Layer, error)
// Cancel the layer upload process.
Cancel() error
}

8
registry/api/v2/names.go
View File

@ -6,6 +6,10 @@ import (
"strings"
)
// TODO(stevvooe): Move these definitions back to an exported package. While
// they are used with v2 definitions, their relevance expands beyond.
// "distribution/names" is a candidate package.
const (
// RepositoryNameComponentMinLength is the minimum number of characters in a
// single repository name slash-delimited component
@ -37,10 +41,6 @@ var RepositoryNameComponentRegexp = regexp.MustCompile(`[a-z0-9]+(?:[._-][a-z0-9
// RepositoryNameComponentRegexp which must completely match the content
var RepositoryNameComponentAnchoredRegexp = regexp.MustCompile(`^` + RepositoryNameComponentRegexp.String() + `$`)
// TODO(stevvooe): RepositoryName needs to be limited to some fixed length.
// Looking path prefixes and s3 limitation of 1024, this should likely be
// around 512 bytes. 256 bytes might be more manageable.
// RepositoryNameRegexp builds on RepositoryNameComponentRegexp to allow 1 to
// 5 path components, separated by a forward slash.
var RepositoryNameRegexp = regexp.MustCompile(`(?:` + RepositoryNameComponentRegexp.String() + `/){0,4}` + RepositoryNameComponentRegexp.String())

34
registry/handlers/app.go
View File

@ -227,10 +227,30 @@ func (app *App) dispatcher(dispatch dispatchFunc) http.Handler {
return
}
// decorate the authorized repository with an event bridge.
if app.nameRequired(r) {
repository, err := app.registry.Repository(context, getName(context))
if err != nil {
ctxu.GetLogger(context).Errorf("error resolving repository: %v", err)
switch err := err.(type) {
case distribution.ErrRepositoryUnknown:
context.Errors.Push(v2.ErrorCodeNameUnknown, err)
case distribution.ErrRepositoryNameInvalid:
context.Errors.Push(v2.ErrorCodeNameInvalid, err)
}
w.WriteHeader(http.StatusBadRequest)
serveJSON(w, context.Errors)
return
}
// assign and decorate the authorized repository with an event bridge.
context.Repository = notifications.Listen(
app.registry.Repository(context, getName(context)),
repository,
app.eventBridge(context, r))
}
handler := dispatch(context, r)
ssrw := &singleStatusResponseWriter{ResponseWriter: w}
@ -318,9 +338,7 @@ func (app *App) authorized(w http.ResponseWriter, r *http.Request, context *Cont
}
} else {
// Only allow the name not to be set on the base route.
route := mux.CurrentRoute(r)
if route == nil || route.GetName() != v2.RouteNameBase {
if app.nameRequired(r) {
// For this to be properly secured, repo must always be set for a
// resource that may make a modification. The only condition under
// which name is not set and we still allow access is when the
@ -378,6 +396,12 @@ func (app *App) eventBridge(ctx *Context, r *http.Request) notifications.Listene
return notifications.NewBridge(ctx.urlBuilder, app.events.source, actor, request, app.events.sink)
}
// nameRequired returns true if the route requires a name.
func (app *App) nameRequired(r *http.Request) bool {
route := mux.CurrentRoute(r)
return route == nil || route.GetName() != v2.RouteNameBase
}
// apiBase implements a simple yes-man for doing overall checks against the
// api. This can support auth roundtrips to support docker login.
func apiBase(w http.ResponseWriter, r *http.Request) {

7
registry/handlers/images.go
View File

@ -10,7 +10,6 @@ import (
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/distribution/registry/api/v2"
"github.com/docker/distribution/registry/storage"
"github.com/gorilla/handlers"
)
@ -70,12 +69,12 @@ func (imh *imageManifestHandler) PutImageManifest(w http.ResponseWriter, r *http
// TODO(stevvooe): These error handling switches really need to be
// handled by an app global mapper.
switch err := err.(type) {
case storage.ErrManifestVerification:
case distribution.ErrManifestVerification:
for _, verificationError := range err {
switch verificationError := verificationError.(type) {
case distribution.ErrUnknownLayer:
imh.Errors.Push(v2.ErrorCodeBlobUnknown, verificationError.FSLayer)
case storage.ErrManifestUnverified:
case distribution.ErrManifestUnverified:
imh.Errors.Push(v2.ErrorCodeManifestUnverified)
default:
if verificationError == digest.ErrDigestInvalidFormat {
@ -104,7 +103,7 @@ func (imh *imageManifestHandler) DeleteImageManifest(w http.ResponseWriter, r *h
manifests := imh.Repository.Manifests()
if err := manifests.Delete(imh.Tag); err != nil {
switch err := err.(type) {
case storage.ErrUnknownManifest:
case distribution.ErrManifestUnknown:
imh.Errors.Push(v2.ErrorCodeManifestUnknown, err)
w.WriteHeader(http.StatusNotFound)
default:

4
registry/handlers/tags.go
View File

@ -4,8 +4,8 @@ import (
"encoding/json"
"net/http"
"github.com/docker/distribution"
"github.com/docker/distribution/registry/api/v2"
"github.com/docker/distribution/registry/storage"
"github.com/gorilla/handlers"
)
@ -38,7 +38,7 @@ func (th *tagsHandler) GetTags(w http.ResponseWriter, r *http.Request) {
tags, err := manifests.Tags()
if err != nil {
switch err := err.(type) {
case storage.ErrUnknownRepository:
case distribution.ErrRepositoryUnknown:
w.WriteHeader(404)
th.Errors.Push(v2.ErrorCodeNameUnknown, map[string]string{"name": th.Repository.Name()})
default:

18
registry/storage/layer_test.go
View File

@ -36,7 +36,11 @@ func TestSimpleLayerUpload(t *testing.T) {
imageName := "foo/bar"
driver := inmemory.New()
registry := NewRegistryWithDriver(driver)
ls := registry.Repository(ctx, imageName).Layers()
repository, err := registry.Repository(ctx, imageName)
if err != nil {
t.Fatalf("unexpected error getting repo: %v", err)
}
ls := repository.Layers()
h := sha256.New()
rd := io.TeeReader(randomDataReader, h)
@ -140,7 +144,11 @@ func TestSimpleLayerRead(t *testing.T) {
imageName := "foo/bar"
driver := inmemory.New()
registry := NewRegistryWithDriver(driver)
ls := registry.Repository(ctx, imageName).Layers()
repository, err := registry.Repository(ctx, imageName)
if err != nil {
t.Fatalf("unexpected error getting repo: %v", err)
}
ls := repository.Layers()
randomLayerReader, tarSumStr, err := testutil.CreateRandomTarFile()
if err != nil {
@ -245,7 +253,11 @@ func TestLayerUploadZeroLength(t *testing.T) {
imageName := "foo/bar"
driver := inmemory.New()
registry := NewRegistryWithDriver(driver)
ls := registry.Repository(ctx, imageName).Layers()
repository, err := registry.Repository(ctx, imageName)
if err != nil {
t.Fatalf("unexpected error getting repo: %v", err)
}
ls := repository.Layers()
upload, err := ls.Upload()
if err != nil {

62
registry/storage/manifeststore.go
View File

@ -2,69 +2,13 @@ package storage
import (
"fmt"
"strings"
"github.com/docker/distribution"
ctxu "github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/libtrust"
)
// ErrUnknownRepository is returned if the named repository is not known by
// the registry.
type ErrUnknownRepository struct {
Name string
}
func (err ErrUnknownRepository) Error() string {
return fmt.Sprintf("unknown respository name=%s", err.Name)
}
// ErrUnknownManifest is returned if the manifest is not known by the
// registry.
type ErrUnknownManifest struct {
Name string
Tag string
}
func (err ErrUnknownManifest) Error() string {
return fmt.Sprintf("unknown manifest name=%s tag=%s", err.Name, err.Tag)
}
// ErrUnknownManifestRevision is returned when a manifest cannot be found by
// revision within a repository.
type ErrUnknownManifestRevision struct {
Name string
Revision digest.Digest
}
func (err ErrUnknownManifestRevision) Error() string {
return fmt.Sprintf("unknown manifest name=%s revision=%s", err.Name, err.Revision)
}
// ErrManifestUnverified is returned when the registry is unable to verify
// the manifest.
type ErrManifestUnverified struct{}
func (ErrManifestUnverified) Error() string {
return fmt.Sprintf("unverified manifest")
}
// ErrManifestVerification provides a type to collect errors encountered
// during manifest verification. Currently, it accepts errors of all types,
// but it may be narrowed to those involving manifest verification.
type ErrManifestVerification []error
func (errs ErrManifestVerification) Error() string {
var parts []string
for _, err := range errs {
parts = append(parts, err.Error())
}
return fmt.Sprintf("errors verifying manifest: %v", strings.Join(parts, ","))
}
type manifestStore struct {
repository *repository
@ -147,7 +91,7 @@ func (ms *manifestStore) Delete(tag string) error {
// registry only tries to store valid content, leaving trust policies of that
// content up to consumers.
func (ms *manifestStore) verifyManifest(tag string, mnfst *manifest.SignedManifest) error {
var errs ErrManifestVerification
var errs distribution.ErrManifestVerification
if mnfst.Name != ms.repository.Name() {
// TODO(stevvooe): This needs to be an exported error
errs = append(errs, fmt.Errorf("repository name does not match manifest name"))
@ -161,10 +105,10 @@ func (ms *manifestStore) verifyManifest(tag string, mnfst *manifest.SignedManife
if _, err := manifest.Verify(mnfst); err != nil {
switch err {
case libtrust.ErrMissingSignatureKey, libtrust.ErrInvalidJSONContent, libtrust.ErrMissingSignatureKey:
errs = append(errs, ErrManifestUnverified{})
errs = append(errs, distribution.ErrManifestUnverified{})
default:
if err.Error() == "invalid signature" { // TODO(stevvooe): This should be exported by libtrust
errs = append(errs, ErrManifestUnverified{})
errs = append(errs, distribution.ErrManifestUnverified{})
} else {
errs = append(errs, err)
}

8
registry/storage/manifeststore_test.go
View File

@ -6,6 +6,7 @@ import (
"reflect"
"testing"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/distribution/registry/storage/driver/inmemory"
@ -20,7 +21,10 @@ func TestManifestStorage(t *testing.T) {
tag := "thetag"
driver := inmemory.New()
registry := NewRegistryWithDriver(driver)
repo := registry.Repository(ctx, name)
repo, err := registry.Repository(ctx, name)
if err != nil {
t.Fatalf("unexpected error getting repo: %v", err)
}
ms := repo.Manifests()
exists, err := ms.Exists(tag)
@ -34,7 +38,7 @@ func TestManifestStorage(t *testing.T) {
if _, err := ms.Get(tag); true {
switch err.(type) {
case ErrUnknownManifest:
case distribution.ErrManifestUnknown:
break
default:
t.Fatalf("expected manifest unknown error: %#v", err)

12
registry/storage/registry.go
View File

@ -2,6 +2,7 @@ package storage
import (
"github.com/docker/distribution"
"github.com/docker/distribution/registry/api/v2"
storagedriver "github.com/docker/distribution/registry/storage/driver"
"golang.org/x/net/context"
)
@ -36,12 +37,19 @@ func NewRegistryWithDriver(driver storagedriver.StorageDriver) distribution.Regi
// Repository returns an instance of the repository tied to the registry.
// Instances should not be shared between goroutines but are cheap to
// allocate. In general, they should be request scoped.
func (reg *registry) Repository(ctx context.Context, name string) distribution.Repository {
func (reg *registry) Repository(ctx context.Context, name string) (distribution.Repository, error) {
if err := v2.ValidateRespositoryName(name); err != nil {
return nil, distribution.ErrRepositoryNameInvalid{
Name: name,
Reason: err,
}
}
return &repository{
ctx: ctx,
registry: reg,
name: name,
}
}, nil
}
// repository provides name-scoped access to various services.

3
registry/storage/revisionstore.go
View File

@ -5,6 +5,7 @@ import (
"path"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/libtrust"
@ -40,7 +41,7 @@ func (rs *revisionStore) get(revision digest.Digest) (*manifest.SignedManifest,
if exists, err := rs.exists(revision); err != nil {
return nil, err
} else if !exists {
return nil, ErrUnknownManifestRevision{
return nil, distribution.ErrUnknownManifestRevision{
Name: rs.Name(),
Revision: revision,
}

5
registry/storage/tagstore.go
View File

@ -3,6 +3,7 @@ package storage
import (
"path"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
storagedriver "github.com/docker/distribution/registry/storage/driver"
)
@ -26,7 +27,7 @@ func (ts *tagStore) tags() ([]string, error) {
if err != nil {
switch err := err.(type) {
case storagedriver.PathNotFoundError:
return nil, ErrUnknownRepository{Name: ts.name}
return nil, distribution.ErrRepositoryUnknown{Name: ts.name}
default:
return nil, err
}
@ -104,7 +105,7 @@ func (ts *tagStore) resolve(tag string) (digest.Digest, error) {
if exists, err := exists(ts.driver, currentPath); err != nil {
return "", err
} else if !exists {
return "", ErrUnknownManifest{Name: ts.Name(), Tag: tag}
return "", distribution.ErrManifestUnknown{Name: ts.Name(), Tag: tag}
}
revision, err := ts.blobStore.readlink(currentPath)