distribution/notifications/listener.go
Manish Tomar 0d8f4ac7b8 add tag deletion event
whenever a tag is deleted an event is sent out via the regular
notification channels

Signed-off-by: Manish Tomar <manish.tomar@docker.com>
2018-07-18 11:34:09 -07:00

246 lines
8 KiB
Go

package notifications
import (
"context"
"net/http"
"github.com/docker/distribution"
dcontext "github.com/docker/distribution/context"
"github.com/docker/distribution/reference"
"github.com/opencontainers/go-digest"
)
// ManifestListener describes a set of methods for listening to events related to manifests.
type ManifestListener interface {
ManifestPushed(repo reference.Named, sm distribution.Manifest, options ...distribution.ManifestServiceOption) error
ManifestPulled(repo reference.Named, sm distribution.Manifest, options ...distribution.ManifestServiceOption) error
ManifestDeleted(repo reference.Named, dgst digest.Digest) error
}
// BlobListener describes a listener that can respond to layer related events.
type BlobListener interface {
BlobPushed(repo reference.Named, desc distribution.Descriptor) error
BlobPulled(repo reference.Named, desc distribution.Descriptor) error
BlobMounted(repo reference.Named, desc distribution.Descriptor, fromRepo reference.Named) error
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
}
// Listener combines all repository events into a single interface.
type Listener interface {
ManifestListener
BlobListener
RepoListener
}
type repositoryListener struct {
distribution.Repository
listener Listener
}
// Listen dispatches events on the repository to the listener.
func Listen(repo distribution.Repository, listener Listener) distribution.Repository {
return &repositoryListener{
Repository: repo,
listener: listener,
}
}
func (rl *repositoryListener) Manifests(ctx context.Context, options ...distribution.ManifestServiceOption) (distribution.ManifestService, error) {
manifests, err := rl.Repository.Manifests(ctx, options...)
if err != nil {
return nil, err
}
return &manifestServiceListener{
ManifestService: manifests,
parent: rl,
}, nil
}
func (rl *repositoryListener) Blobs(ctx context.Context) distribution.BlobStore {
return &blobServiceListener{
BlobStore: rl.Repository.Blobs(ctx),
parent: rl,
}
}
type manifestServiceListener struct {
distribution.ManifestService
parent *repositoryListener
}
func (msl *manifestServiceListener) Delete(ctx context.Context, dgst digest.Digest) error {
err := msl.ManifestService.Delete(ctx, dgst)
if err == nil {
if err := msl.parent.listener.ManifestDeleted(msl.parent.Repository.Named(), dgst); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching manifest delete to listener: %v", err)
}
}
return err
}
func (msl *manifestServiceListener) Get(ctx context.Context, dgst digest.Digest, options ...distribution.ManifestServiceOption) (distribution.Manifest, error) {
sm, err := msl.ManifestService.Get(ctx, dgst, options...)
if err == nil {
if err := msl.parent.listener.ManifestPulled(msl.parent.Repository.Named(), sm, options...); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching manifest pull to listener: %v", err)
}
}
return sm, err
}
func (msl *manifestServiceListener) Put(ctx context.Context, sm distribution.Manifest, options ...distribution.ManifestServiceOption) (digest.Digest, error) {
dgst, err := msl.ManifestService.Put(ctx, sm, options...)
if err == nil {
if err := msl.parent.listener.ManifestPushed(msl.parent.Repository.Named(), sm, options...); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching manifest push to listener: %v", err)
}
}
return dgst, err
}
type blobServiceListener struct {
distribution.BlobStore
parent *repositoryListener
}
var _ distribution.BlobStore = &blobServiceListener{}
func (bsl *blobServiceListener) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
p, err := bsl.BlobStore.Get(ctx, dgst)
if err == nil {
if desc, err := bsl.Stat(ctx, dgst); err != nil {
dcontext.GetLogger(ctx).Errorf("error resolving descriptor in ServeBlob listener: %v", err)
} else {
if err := bsl.parent.listener.BlobPulled(bsl.parent.Repository.Named(), desc); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching layer pull to listener: %v", err)
}
}
}
return p, err
}
func (bsl *blobServiceListener) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
rc, err := bsl.BlobStore.Open(ctx, dgst)
if err == nil {
if desc, err := bsl.Stat(ctx, dgst); err != nil {
dcontext.GetLogger(ctx).Errorf("error resolving descriptor in ServeBlob listener: %v", err)
} else {
if err := bsl.parent.listener.BlobPulled(bsl.parent.Repository.Named(), desc); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching layer pull to listener: %v", err)
}
}
}
return rc, err
}
func (bsl *blobServiceListener) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {
err := bsl.BlobStore.ServeBlob(ctx, w, r, dgst)
if err == nil {
if desc, err := bsl.Stat(ctx, dgst); err != nil {
dcontext.GetLogger(ctx).Errorf("error resolving descriptor in ServeBlob listener: %v", err)
} else {
if err := bsl.parent.listener.BlobPulled(bsl.parent.Repository.Named(), desc); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching layer pull to listener: %v", err)
}
}
}
return err
}
func (bsl *blobServiceListener) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
desc, err := bsl.BlobStore.Put(ctx, mediaType, p)
if err == nil {
if err := bsl.parent.listener.BlobPushed(bsl.parent.Repository.Named(), desc); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching layer push to listener: %v", err)
}
}
return desc, err
}
func (bsl *blobServiceListener) Create(ctx context.Context, options ...distribution.BlobCreateOption) (distribution.BlobWriter, error) {
wr, err := bsl.BlobStore.Create(ctx, options...)
switch err := err.(type) {
case distribution.ErrBlobMounted:
if err := bsl.parent.listener.BlobMounted(bsl.parent.Repository.Named(), err.Descriptor, err.From); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching blob mount to listener: %v", err)
}
return nil, err
}
return bsl.decorateWriter(wr), err
}
func (bsl *blobServiceListener) Delete(ctx context.Context, dgst digest.Digest) error {
err := bsl.BlobStore.Delete(ctx, dgst)
if err == nil {
if err := bsl.parent.listener.BlobDeleted(bsl.parent.Repository.Named(), dgst); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching layer delete to listener: %v", err)
}
}
return err
}
func (bsl *blobServiceListener) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
wr, err := bsl.BlobStore.Resume(ctx, id)
return bsl.decorateWriter(wr), err
}
func (bsl *blobServiceListener) decorateWriter(wr distribution.BlobWriter) distribution.BlobWriter {
return &blobWriterListener{
BlobWriter: wr,
parent: bsl,
}
}
type blobWriterListener struct {
distribution.BlobWriter
parent *blobServiceListener
}
func (bwl *blobWriterListener) Commit(ctx context.Context, desc distribution.Descriptor) (distribution.Descriptor, error) {
committed, err := bwl.BlobWriter.Commit(ctx, desc)
if err == nil {
if err := bwl.parent.parent.listener.BlobPushed(bwl.parent.parent.Repository.Named(), committed); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching blob push to listener: %v", err)
}
}
return committed, err
}
type tagServiceListener struct {
distribution.TagService
parent *repositoryListener
}
func (rl *repositoryListener) Tags(ctx context.Context) distribution.TagService {
return &tagServiceListener{
TagService: rl.Repository.Tags(ctx),
parent: rl,
}
}
func (tagSL *tagServiceListener) Untag(ctx context.Context, tag string) error {
if err := tagSL.TagService.Untag(ctx, tag); err != nil {
return err
}
if err := tagSL.parent.listener.TagDeleted(tagSL.parent.Repository.Named(), tag); err != nil {
dcontext.GetLogger(ctx).Errorf("error dispatching tag deleted to listener: %v", err)
return err
}
return nil
}