// BuildBlobURL constructs the url for the blob identified by name and dgst.
func (ub *URLBuilder) BuildBlobURL(ref reference.Canonical) (string, error) {
route := ub.cloneRoute(RouteNameBlob)
layerURL, err := route.URL("name", ref.Name(), "digest", ref.Digest().String())
if err != nil {
return "", err
}
return layerURL.String(), nil
}
// NewRegistryPullThroughCache creates a registry acting as a pull through cache
func NewRegistryPullThroughCache(ctx context.Context, registry distribution.Namespace, driver driver.StorageDriver, config configuration.Proxy) (distribution.Namespace, error) {
remoteURL, err := url.Parse(config.RemoteURL)
if err != nil {
return nil, err
}
v := storage.NewVacuum(ctx, driver)
s := scheduler.New(ctx, driver, "/scheduler-state.json")
s.OnBlobExpire(func(ref reference.Reference) error {
var r reference.Canonical
var ok bool
if r, ok = ref.(reference.Canonical); !ok {
return fmt.Errorf("unexpected reference type : %T", ref)
}
repo, err := registry.Repository(ctx, r)
if err != nil {
return err
}
blobs := repo.Blobs(ctx)
// Clear the repository reference and descriptor caches
err = blobs.Delete(ctx, r.Digest())
if err != nil {
return err
}
err = v.RemoveBlob(r.Digest().String())
if err != nil {
return err
}
return nil
})
s.OnManifestExpire(func(ref reference.Reference) error {
var r reference.Canonical
var ok bool
if r, ok = ref.(reference.Canonical); !ok {
return fmt.Errorf("unexpected reference type : %T", ref)
}
repo, err := registry.Repository(ctx, r)
if err != nil {
return err
}
manifests, err := repo.Manifests(ctx)
if err != nil {
return err
}
err = manifests.Delete(ctx, r.Digest())
if err != nil {
return err
}
return nil
})
err = s.Start()
if err != nil {
return nil, err
}
cs, err := configureAuth(config.Username, config.Password, config.RemoteURL)
if err != nil {
return nil, err
}
return &proxyingRegistry{
embedded: registry,
scheduler: s,
remoteURL: *remoteURL,
authChallenger: &remoteAuthChallenger{
remoteURL: *remoteURL,
cm: auth.NewSimpleChallengeManager(),
cs: cs,
},
}, nil
}