nip77: FetchIDsOnly()

nip77/negentropy/storage/empty/empty.go

@@ -0,0 +1,28 @@
+package empty
+
+import (
+	"iter"
+
+	"github.com/nbd-wtf/go-nostr/nip77/negentropy"
+	"github.com/nbd-wtf/go-nostr/nip77/negentropy/storage"
+)
+
+var acc storage.Accumulator
+
+type Empty struct{}
+
+func (Empty) Size() int { return 0 }
+
+func (Empty) Range(begin, end int) iter.Seq2[int, negentropy.Item] {
+	return func(yield func(int, negentropy.Item) bool) {}
+}
+
+func (Empty) FindLowerBound(begin, end int, value negentropy.Bound) int { return begin }
+
+func (Empty) GetBound(idx int) negentropy.Bound {
+	return negentropy.InfiniteBound
+}
+
+func (Empty) Fingerprint(begin, end int) string {
+	return acc.GetFingerprint(end - begin)
+}