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