add support for repo deleted event also

by having another interface RepositoryRemover that is implemented by
registry instance and is injected in app context for event tracking

Signed-off-by: Manish Tomar <manish.tomar@docker.com>

notifications/bridge.go

@@ -116,6 +116,13 @@ func (b *bridge) TagDeleted(repo reference.Named, tag string) error {
 	return b.sink.Write(*event)
 }
 
+func (b *bridge) RepoDeleted(repo reference.Named) error {
+	event := b.createEvent(EventActionDelete)
+	event.Target.Repository = repo.Name()
+
+	return b.sink.Write(*event)
+}
+
 func (b *bridge) createManifestEventAndWrite(action string, repo reference.Named, sm distribution.Manifest) error {
 	manifestEvent, err := b.createManifestEvent(action, repo, sm)
 	if err != nil {

notifications/bridge_test.go

@@ -124,6 +124,18 @@ func TestEventBridgeTagDeleted(t *testing.T) {
 	}
 }
 
+func TestEventBridgeRepoDeleted(t *testing.T) {
+	l := createTestEnv(t, testSinkFn(func(events ...Event) error {
+		checkDeleted(t, EventActionDelete, events...)
+		return nil
+	}))
+
+	repoRef, _ := reference.WithName(repo)
+	if err := l.RepoDeleted(repoRef); err != nil {
+		t.Fatalf("unexpected error notifying repo deletion: %v", err)
+	}
+}
+
 func createTestEnv(t *testing.T, fn testSinkFn) Listener {
 	pk, err := libtrust.GenerateECP256PrivateKey()
 	if err != nil {

notifications/listener.go

@@ -26,9 +26,9 @@ type BlobListener interface {
 	BlobDeleted(repo reference.Named, desc digest.Digest) error
 }
 
-// RepoListener describes a listener that can respond to repository related events.
 type RepoListener interface {
 	TagDeleted(repo reference.Named, tag string) error
+	RepoDeleted(repo reference.Named) error
 }
 
 // Listener combines all repository events into a single interface.
@@ -43,12 +43,28 @@ type repositoryListener struct {
 	listener Listener
 }
 
+type removerListener struct {
+	distribution.RepositoryRemover
+	listener Listener
+}
+
 // Listen dispatches events on the repository to the listener.
-func Listen(repo distribution.Repository, listener Listener) distribution.Repository {
+func Listen(repo distribution.Repository, remover distribution.RepositoryRemover, listener Listener) (distribution.Repository, distribution.RepositoryRemover) {
 	return &repositoryListener{
-		Repository: repo,
-		listener:   listener,
+			Repository: repo,
+			listener:   listener,
+		}, &removerListener{
+			RepositoryRemover: remover,
+			listener:          listener,
+		}
+}
+
+func (nl *removerListener) Remove(ctx context.Context, name reference.Named) error {
+	err := nl.RepositoryRemover.Remove(ctx, name)
+	if err != nil {
+		return err
 	}
+	return nl.listener.RepoDeleted(name)
 }
 
 func (rl *repositoryListener) Manifests(ctx context.Context, options ...distribution.ManifestServiceOption) (distribution.ManifestService, error) {

notifications/listener_test.go

@@ -38,10 +38,15 @@ func TestListener(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unexpected error getting repo: %v", err)
 	}
-	repository = Listen(repository, tl)
+
+	remover, ok := registry.(distribution.RepositoryRemover)
+	if !ok {
+		t.Fatal("registry does not implement RepositoryRemover")
+	}
+	repository, remover = Listen(repository, remover, tl)
 
 	// Now take the registry through a number of operations
-	checkExerciseRepository(t, repository)
+	checkExerciseRepository(t, repository, remover)
 
 	expectedOps := map[string]int{
 		"manifest:push":   1,
@@ -51,6 +56,7 @@ func TestListener(t *testing.T) {
 		"layer:pull":      2,
 		"layer:delete":    2,
 		"tag:delete":      1,
+		"repo:delete":     1,
 	}
 
 	if !reflect.DeepEqual(tl.ops, expectedOps) {
@@ -102,9 +108,14 @@ func (tl *testListener) TagDeleted(repo reference.Named, tag string) error {
 	return nil
 }
 
+func (tl *testListener) RepoDeleted(repo reference.Named) error {
+	tl.ops["repo:delete"]++
+	return nil
+}
+
 // checkExerciseRegistry takes the registry through all of its operations,
 // carrying out generic checks.
-func checkExerciseRepository(t *testing.T, repository distribution.Repository) {
+func checkExerciseRepository(t *testing.T, repository distribution.Repository, remover distribution.RepositoryRemover) {
 	// TODO(stevvooe): This would be a nice testutil function. Basically, it
 	// takes the registry through a common set of operations. This could be
 	// used to make cross-cutting updates by changing internals that affect
@@ -210,4 +221,9 @@ func checkExerciseRepository(t *testing.T, repository distribution.Repository) {
 	if err != nil {
 		t.Fatalf("unexpected error deleting tag: %v", err)
 	}
+
+	err = remover.Remove(ctx, repository.Named())
+	if err != nil {
+		t.Fatalf("unexpected error deleting repo: %v", err)
+	}
 }

registry.go

@@ -54,6 +54,11 @@ type RepositoryEnumerator interface {
 	Enumerate(ctx context.Context, ingester func(string) error) error
 }
 
+// RepositoryRemover removes given repository
+type RepositoryRemover interface {
+	Remove(ctx context.Context, name reference.Named) error
+}
+
 // ManifestServiceOption is a function argument for Manifest Service methods
 type ManifestServiceOption interface {
 	Apply(ManifestService) error

registry/storage/catalog.go

@@ -7,6 +7,7 @@ import (
 	"path"
 	"strings"
 
+	"github.com/docker/distribution/reference"
 	"github.com/docker/distribution/registry/storage/driver"
 )
 
@@ -70,6 +71,16 @@ func (reg *registry) Enumerate(ctx context.Context, ingester func(string) error)
 	return err
 }
 
+// Remove removes a repository from storage
+func (r *registry) Remove(ctx context.Context, name reference.Named) error {
+	root, err := pathFor(repositoriesRootPathSpec{})
+	if err != nil {
+		return err
+	}
+	repoDir := path.Join(root, name.Name())
+	return r.driver.Delete(ctx, repoDir)
+}
+
 // lessPath returns true if one path a is less than path b.
 //
 // A component-wise comparison is done, rather than the lexical comparison of

registry/storage/registry.go

@@ -23,6 +23,7 @@ type registry struct {
 	schema1SigningKey            libtrust.PrivateKey
 	blobDescriptorServiceFactory distribution.BlobDescriptorServiceFactory
 	manifestURLs                 manifestURLs
+	driver                       storagedriver.StorageDriver
 }
 
 // manifestURLs holds regular expressions for controlling manifest URL whitelisting
@@ -133,6 +134,7 @@ func NewRegistry(ctx context.Context, driver storagedriver.StorageDriver, option
 		},
 		statter:                statter,
 		resumableDigestEnabled: true,
+		driver:                 driver,
 	}
 
 	for _, option := range options {