package notifications import ( "net/http" "time" "github.com/docker/distribution" "github.com/docker/distribution/context" "github.com/docker/distribution/digest" "github.com/docker/distribution/manifest" "github.com/docker/distribution/uuid" ) type bridge struct { ub URLBuilder actor ActorRecord source SourceRecord request RequestRecord sink Sink } var _ Listener = &bridge{} // URLBuilder defines a subset of url builder to be used by the event listener. type URLBuilder interface { BuildManifestURL(name, tag string) (string, error) BuildBlobURL(name string, dgst digest.Digest) (string, error) } // NewBridge returns a notification listener that writes records to sink, // using the actor and source. Any urls populated in the events created by // this bridge will be created using the URLBuilder. // TODO(stevvooe): Update this to simply take a context.Context object. func NewBridge(ub URLBuilder, source SourceRecord, actor ActorRecord, request RequestRecord, sink Sink) Listener { return &bridge{ ub: ub, actor: actor, source: source, request: request, sink: sink, } } // NewRequestRecord builds a RequestRecord for use in NewBridge from an // http.Request, associating it with a request id. func NewRequestRecord(id string, r *http.Request) RequestRecord { return RequestRecord{ ID: id, Addr: context.RemoteAddr(r), Host: r.Host, Method: r.Method, UserAgent: r.UserAgent(), } } func (b *bridge) ManifestPushed(repo distribution.Repository, sm *manifest.SignedManifest) error { return b.createManifestEventAndWrite(EventActionPush, repo, sm) } func (b *bridge) ManifestPulled(repo distribution.Repository, sm *manifest.SignedManifest) error { return b.createManifestEventAndWrite(EventActionPull, repo, sm) } func (b *bridge) ManifestDeleted(repo distribution.Repository, sm *manifest.SignedManifest) error { return b.createManifestEventAndWrite(EventActionDelete, repo, sm) } func (b *bridge) BlobPushed(repo distribution.Repository, desc distribution.Descriptor) error { return b.createBlobEventAndWrite(EventActionPush, repo, desc) } func (b *bridge) BlobPulled(repo distribution.Repository, desc distribution.Descriptor) error { return b.createBlobEventAndWrite(EventActionPull, repo, desc) } func (b *bridge) BlobDeleted(repo distribution.Repository, desc distribution.Descriptor) error { return b.createBlobEventAndWrite(EventActionDelete, repo, desc) } func (b *bridge) createManifestEventAndWrite(action string, repo distribution.Repository, sm *manifest.SignedManifest) error { manifestEvent, err := b.createManifestEvent(action, repo, sm) if err != nil { return err } return b.sink.Write(*manifestEvent) } func (b *bridge) createManifestEvent(action string, repo distribution.Repository, sm *manifest.SignedManifest) (*Event, error) { event := b.createEvent(action) event.Target.MediaType = manifest.ManifestMediaType event.Target.Repository = repo.Name() p, err := sm.Payload() if err != nil { return nil, err } event.Target.Length = int64(len(p)) event.Target.Digest, err = digest.FromBytes(p) if err != nil { return nil, err } // TODO(stevvooe): Currently, the is the "tag" url: once the digest url is // implemented, this should be replaced. event.Target.URL, err = b.ub.BuildManifestURL(sm.Name, sm.Tag) if err != nil { return nil, err } return event, nil } func (b *bridge) createBlobEventAndWrite(action string, repo distribution.Repository, desc distribution.Descriptor) error { event, err := b.createBlobEvent(action, repo, desc) if err != nil { return err } return b.sink.Write(*event) } func (b *bridge) createBlobEvent(action string, repo distribution.Repository, desc distribution.Descriptor) (*Event, error) { event := b.createEvent(action) event.Target.Descriptor = desc event.Target.Repository = repo.Name() var err error event.Target.URL, err = b.ub.BuildBlobURL(repo.Name(), desc.Digest) if err != nil { return nil, err } return event, nil } // createEvent creates an event with actor and source populated. func (b *bridge) createEvent(action string) *Event { event := createEvent(action) event.Source = b.source event.Actor = b.actor event.Request = b.request return event } // createEvent returns a new event, timestamped, with the specified action. func createEvent(action string) *Event { return &Event{ ID: uuid.Generate().String(), Timestamp: time.Now(), Action: action, } }