const (
	// ExportResponseManifestDesc is a key for the map returned from Exporter.Finalize.
	// The map value is a JSON string of an OCI desciptor of a manifest.
	ExporterResponseManifestDesc = "cache.manifest"
)

type DistributionSourceLabelSetter interface {
	SetDistributionSourceLabel(context.Context, digest.Digest) error
	SetDistributionSourceAnnotation(desc ocispec.Descriptor) ocispec.Descriptor
}

type Exporter interface {
	solver.CacheExporterTarget
	// Finalize finalizes and return metadata that are returned to the client
	// e.g. ExporterResponseManifestDesc
	Finalize(ctx context.Context) (map[string]string, error)
}

type Importer interface {
	Resolve(ctx context.Context, desc ocispec.Descriptor, id string, w worker.Worker) (solver.CacheManager, error)
}

type ResolveCacheExporterFunc func(ctx context.Context, g session.Group, attrs map[string]string) (Exporter, error)

type ResolveCacheImporterFunc func(ctx context.Context, g session.Group, attrs map[string]string) (Importer, ocispec.Descriptor, error)