const (
	LabelExecutor    = labelPrefix + "executor"    // "oci" or "containerd"
	LabelSnapshotter = labelPrefix + "snapshotter" // containerd snapshotter name ("overlay", "native", ...)
	LabelHostname    = labelPrefix + "hostname"
)

type Controller struct {
	// contains filtered or unexported fields
}

type Infos interface {
	GetDefault() (Worker, error)
	WorkerInfos() []client.WorkerInfo
}

type Worker interface {
	// ID needs to be unique in the cluster
	ID() string
	Labels() map[string]string
	Platforms(noCache bool) []specs.Platform

	GCPolicy() []client.PruneInfo
	LoadRef(ctx context.Context, id string, hidden bool) (cache.ImmutableRef, error)
	// ResolveOp resolves Vertex.Sys() to Op implementation.
	ResolveOp(v solver.Vertex, s frontend.FrontendLLBBridge, sm *session.Manager) (solver.Op, error)
	ResolveImageConfig(ctx context.Context, ref string, opt llb.ResolveImageConfigOpt, sm *session.Manager, g session.Group) (digest.Digest, []byte, error)
	DiskUsage(ctx context.Context, opt client.DiskUsageInfo) ([]*client.UsageInfo, error)
	Exporter(name string, sm *session.Manager) (exporter.Exporter, error)
	Prune(ctx context.Context, ch chan client.UsageInfo, opt ...client.PruneInfo) error
	FromRemote(ctx context.Context, remote *solver.Remote) (cache.ImmutableRef, error)
	PruneCacheMounts(ctx context.Context, ids []string) error
	ContentStore() content.Store
	Executor() executor.Executor
	CacheManager() cache.Manager
	MetadataStore() *metadata.Store
}

type WorkerRef struct {
	ImmutableRef cache.ImmutableRef
	Worker       Worker
}