152 lines
4.1 KiB
Go
152 lines
4.1 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"
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"github.com/docker/distribution/context"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/uuid"
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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: context.RemoteAddr(r),
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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 string, sm distribution.Manifest) error {
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return b.createManifestEventAndWrite(EventActionPush, repo, sm)
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}
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func (b *bridge) ManifestPulled(repo string, sm distribution.Manifest) error {
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return b.createManifestEventAndWrite(EventActionPull, repo, sm)
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}
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func (b *bridge) ManifestDeleted(repo string, sm distribution.Manifest) error {
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return b.createManifestEventAndWrite(EventActionDelete, repo, sm)
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}
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func (b *bridge) BlobPushed(repo string, desc distribution.Descriptor) error {
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return b.createBlobEventAndWrite(EventActionPush, repo, desc)
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}
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func (b *bridge) BlobPulled(repo string, desc distribution.Descriptor) error {
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return b.createBlobEventAndWrite(EventActionPull, repo, desc)
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}
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func (b *bridge) BlobDeleted(repo string, desc distribution.Descriptor) error {
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return b.createBlobEventAndWrite(EventActionDelete, repo, desc)
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}
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func (b *bridge) createManifestEventAndWrite(action string, repo string, sm distribution.Manifest) error {
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manifestEvent, 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(*manifestEvent)
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}
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func (b *bridge) createManifestEvent(action string, repo string, sm distribution.Manifest) (*Event, error) {
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event := b.createEvent(action)
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event.Target.Repository = repo
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mt, 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.MediaType = mt
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event.Target.Length = int64(len(p))
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event.Target.Size = int64(len(p))
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event.Target.Digest = digest.FromBytes(p)
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event.Target.URL, err = b.ub.BuildManifestURL(repo, event.Target.Digest.String())
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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) createBlobEventAndWrite(action string, repo string, desc distribution.Descriptor) error {
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event, err := b.createBlobEvent(action, repo, desc)
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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) createBlobEvent(action string, repo string, desc distribution.Descriptor) (*Event, error) {
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event := b.createEvent(action)
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event.Target.Descriptor = desc
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event.Target.Length = desc.Size
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event.Target.Repository = repo
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var err error
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event.Target.URL, err = b.ub.BuildBlobURL(repo, desc.Digest)
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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.Generate().String(),
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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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