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