Add PeerStorer interface

dht.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/anacrolix/dht/v2"
 	"github.com/anacrolix/dht/v2/krpc"
+	peer_store "github.com/anacrolix/dht/v2/peer-store"
 )
 
 type DhtServer interface {
@@ -18,6 +19,11 @@ type DhtServer interface {
 	WriteStatus(io.Writer)
 }
 
+// Optional interface for DhtServer's that can expose their peer store (if any).
+type PeerStorer interface {
+	PeerStore() peer_store.Interface
+}
+
 type DhtAnnounce interface {
 	Close()
 	Peers() <-chan dht.PeersValues