refactor once again

grain-pool.go

@@ -17,7 +17,7 @@ import (
 //   from the new CartID base62 representation). For backward compatibility,
 //   a deprecated legacy map keyed by CartId is maintained so existing code
 //   that directly indexes pool.grains with a CartId continues to compile
-//   until the full refactor across SyncedPool / remoteIndex is completed.
+//   until the full refactor across SyncedPool is completed.
 //
 //   Authoritative storage: grains (map[uint64]*CartGrain)
 //   Legacy compatibility:  grainsLegacy (map[CartId]*CartGrain) - kept in sync.
@@ -46,6 +46,10 @@ var (
 type GrainPool interface {
 	Apply(id CartId, mutation interface{}) (*CartGrain, error)
 	Get(id CartId) (*CartGrain, error)
+	// OwnerHost returns the primary owner host for a given cart id.
+	OwnerHost(id CartId) string
+	// Hostname returns the hostname of the local pool implementation.
+	Hostname() string
 }
 
 // Ttl keeps expiry info
@@ -242,3 +246,16 @@ func (p *GrainLocalPool) UnsafePointerToLegacyMap() uintptr {
 	// Legacy map removed; retained only to satisfy any transitional callers.
 	return 0
 }
+
+// OwnerHost implements the extended GrainPool interface for the standalone
+// local pool. Since the local pool has no concept of multi-host ownership,
+// it returns an empty string. Callers can treat empty as "local host".
+func (p *GrainLocalPool) OwnerHost(id CartId) string {
+	return ""
+}
+
+// Hostname returns a blank string because GrainLocalPool does not track a node
+// identity. (SyncedPool will return the real hostname.)
+func (p *GrainLocalPool) Hostname() string {
+	return ""
+}