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package proxy
import (
"context"
"github.com/docker/distribution"
)
// proxyTagService supports local and remote lookup of tags.
type proxyTagService struct {
localTags distribution.TagService
remoteTags distribution.TagService
authChallenger authChallenger
}
var _ distribution.TagService = proxyTagService{}
// Get attempts to get the most recent digest for the tag by checking the remote
// tag service first and then caching it locally. If the remote is unavailable
// the local association is returned
func (pt proxyTagService) Get(ctx context.Context, tag string) (distribution.Descriptor, error) {
err := pt.authChallenger.tryEstablishChallenges(ctx)
if err == nil {
desc, err := pt.remoteTags.Get(ctx, tag)
if err == nil {
err := pt.localTags.Tag(ctx, tag, desc)
if err != nil {
return distribution.Descriptor{}, err
}
return desc, nil
}
}
desc, err := pt.localTags.Get(ctx, tag)
if err != nil {
return distribution.Descriptor{}, err
}
return desc, nil
}
func (pt proxyTagService) Tag(ctx context.Context, tag string, desc distribution.Descriptor) error {
return distribution.ErrUnsupported
}
func (pt proxyTagService) Untag(ctx context.Context, tag string) error {
err := pt.localTags.Untag(ctx, tag)
if err != nil {
return err
}
return nil
}
func (pt proxyTagService) All(ctx context.Context) ([]string, error) {
err := pt.authChallenger.tryEstablishChallenges(ctx)
if err == nil {
tags, err := pt.remoteTags.All(ctx)
if err == nil {
return tags, err
}
}
return pt.localTags.All(ctx)
}
func (pt proxyTagService) Lookup(ctx context.Context, digest distribution.Descriptor) ([]string, error) {
return []string{}, distribution.ErrUnsupported
}
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