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bridge.go
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bridge.go
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package notifications
import (
"net/http"
"time"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/reference"
"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 reference.Named) (string, error)
BuildBlobURL(ref reference.Canonical) (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 reference.Named, sm distribution.Manifest, options ...distribution.ManifestServiceOption) error {
manifestEvent, err := b.createManifestEvent(EventActionPush, repo, sm)
if err != nil {
return err
}
for _, option := range options {
if opt, ok := option.(distribution.WithTagOption); ok {
manifestEvent.Target.Tag = opt.Tag
break
}
}
return b.sink.Write(*manifestEvent)
}
func (b *bridge) ManifestPulled(repo reference.Named, sm distribution.Manifest, options ...distribution.ManifestServiceOption) error {
manifestEvent, err := b.createManifestEvent(EventActionPull, repo, sm)
if err != nil {
return err
}
for _, option := range options {
if opt, ok := option.(distribution.WithTagOption); ok {
manifestEvent.Target.Tag = opt.Tag
break
}
}
return b.sink.Write(*manifestEvent)
}
func (b *bridge) ManifestDeleted(repo reference.Named, dgst digest.Digest) error {
return b.createManifestDeleteEventAndWrite(EventActionDelete, repo, dgst)
}
func (b *bridge) BlobPushed(repo reference.Named, desc distribution.Descriptor) error {
return b.createBlobEventAndWrite(EventActionPush, repo, desc)
}
func (b *bridge) BlobPulled(repo reference.Named, desc distribution.Descriptor) error {
return b.createBlobEventAndWrite(EventActionPull, repo, desc)
}
func (b *bridge) BlobMounted(repo reference.Named, desc distribution.Descriptor, fromRepo reference.Named) error {
event, err := b.createBlobEvent(EventActionMount, repo, desc)
if err != nil {
return err
}
event.Target.FromRepository = fromRepo.Name()
return b.sink.Write(*event)
}
func (b *bridge) BlobDeleted(repo reference.Named, dgst digest.Digest) error {
return b.createBlobDeleteEventAndWrite(EventActionDelete, repo, dgst)
}
func (b *bridge) createManifestEventAndWrite(action string, repo reference.Named, sm distribution.Manifest) error {
manifestEvent, err := b.createManifestEvent(action, repo, sm)
if err != nil {
return err
}
return b.sink.Write(*manifestEvent)
}
func (b *bridge) createManifestDeleteEventAndWrite(action string, repo reference.Named, dgst digest.Digest) error {
event := b.createEvent(action)
event.Target.Repository = repo.Name()
event.Target.Digest = dgst
return b.sink.Write(*event)
}
func (b *bridge) createManifestEvent(action string, repo reference.Named, sm distribution.Manifest) (*Event, error) {
event := b.createEvent(action)
event.Target.Repository = repo.Name()
mt, p, err := sm.Payload()
if err != nil {
return nil, err
}
// Ensure we have the canonical manifest descriptor here
_, desc, err := distribution.UnmarshalManifest(mt, p)
if err != nil {
return nil, err
}
event.Target.MediaType = mt
event.Target.Length = desc.Size
event.Target.Size = desc.Size
event.Target.Digest = desc.Digest
ref, err := reference.WithDigest(repo, event.Target.Digest)
if err != nil {
return nil, err
}
event.Target.URL, err = b.ub.BuildManifestURL(ref)
if err != nil {
return nil, err
}
return event, nil
}
func (b *bridge) createBlobDeleteEventAndWrite(action string, repo reference.Named, dgst digest.Digest) error {
event := b.createEvent(action)
event.Target.Digest = dgst
event.Target.Repository = repo.Name()
return b.sink.Write(*event)
}
func (b *bridge) createBlobEventAndWrite(action string, repo reference.Named, 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 reference.Named, desc distribution.Descriptor) (*Event, error) {
event := b.createEvent(action)
event.Target.Descriptor = desc
event.Target.Length = desc.Size
event.Target.Repository = repo.Name()
ref, err := reference.WithDigest(repo, desc.Digest)
if err != nil {
return nil, err
}
event.Target.URL, err = b.ub.BuildBlobURL(ref)
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,
}
}