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listener.go
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listener.go
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package notifications
import (
"github.com/Sirupsen/logrus"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
)
// ManifestListener describes a set of methods for listening to events related to manifests.
type ManifestListener interface {
ManifestPushed(repo distribution.Repository, sm *manifest.SignedManifest) error
ManifestPulled(repo distribution.Repository, sm *manifest.SignedManifest) error
// TODO(stevvooe): Please note that delete support is still a little shaky
// and we'll need to propagate these in the future.
ManifestDeleted(repo distribution.Repository, sm *manifest.SignedManifest) error
}
// LayerListener describes a listener that can respond to layer related events.
type LayerListener interface {
LayerPushed(repo distribution.Repository, layer distribution.Layer) error
LayerPulled(repo distribution.Repository, layer distribution.Layer) error
// TODO(stevvooe): Please note that delete support is still a little shaky
// and we'll need to propagate these in the future.
LayerDeleted(repo distribution.Repository, layer distribution.Layer) error
}
// Listener combines all repository events into a single interface.
type Listener interface {
ManifestListener
LayerListener
}
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() distribution.ManifestService {
return &manifestServiceListener{
ManifestService: rl.Repository.Manifests(),
parent: rl,
}
}
func (rl *repositoryListener) Layers() distribution.LayerService {
return &layerServiceListener{
LayerService: rl.Repository.Layers(),
parent: rl,
}
}
type manifestServiceListener struct {
distribution.ManifestService
parent *repositoryListener
}
func (msl *manifestServiceListener) Get(dgst digest.Digest) (*manifest.SignedManifest, error) {
sm, err := msl.ManifestService.Get(dgst)
if err == nil {
if err := msl.parent.listener.ManifestPulled(msl.parent.Repository, sm); err != nil {
logrus.Errorf("error dispatching manifest pull to listener: %v", err)
}
}
return sm, err
}
func (msl *manifestServiceListener) Put(sm *manifest.SignedManifest) error {
err := msl.ManifestService.Put(sm)
if err == nil {
if err := msl.parent.listener.ManifestPushed(msl.parent.Repository, sm); err != nil {
logrus.Errorf("error dispatching manifest push to listener: %v", err)
}
}
return err
}
func (msl *manifestServiceListener) GetByTag(tag string) (*manifest.SignedManifest, error) {
sm, err := msl.ManifestService.GetByTag(tag)
if err == nil {
if err := msl.parent.listener.ManifestPulled(msl.parent.Repository, sm); err != nil {
logrus.Errorf("error dispatching manifest pull to listener: %v", err)
}
}
return sm, err
}
type layerServiceListener struct {
distribution.LayerService
parent *repositoryListener
}
func (lsl *layerServiceListener) Fetch(dgst digest.Digest) (distribution.Layer, error) {
layer, err := lsl.LayerService.Fetch(dgst)
if err == nil {
if err := lsl.parent.listener.LayerPulled(lsl.parent.Repository, layer); err != nil {
logrus.Errorf("error dispatching layer pull to listener: %v", err)
}
}
return layer, err
}
func (lsl *layerServiceListener) Upload() (distribution.LayerUpload, error) {
lu, err := lsl.LayerService.Upload()
return lsl.decorateUpload(lu), err
}
func (lsl *layerServiceListener) Resume(uuid string) (distribution.LayerUpload, error) {
lu, err := lsl.LayerService.Resume(uuid)
return lsl.decorateUpload(lu), err
}
func (lsl *layerServiceListener) decorateUpload(lu distribution.LayerUpload) distribution.LayerUpload {
return &layerUploadListener{
LayerUpload: lu,
parent: lsl,
}
}
type layerUploadListener struct {
distribution.LayerUpload
parent *layerServiceListener
}
func (lul *layerUploadListener) Finish(dgst digest.Digest) (distribution.Layer, error) {
layer, err := lul.LayerUpload.Finish(dgst)
if err == nil {
if err := lul.parent.parent.listener.LayerPushed(lul.parent.parent.Repository, layer); err != nil {
logrus.Errorf("error dispatching layer push to listener: %v", err)
}
}
return layer, err
}