auction key iterator

x/cosmostest/memdb/biddb.go

@@ -152,3 +152,23 @@ func (b *bidDB) ClearAuction(auctionId string) error {
 
 	return err
 }
+
+// Iterate over all auction keys in memory. VIEW-ONLY.
+func (b *bidDB) ForEachAuction(viewFunc func(string) error) error {
+	err := b.db.View(func(txn *badger.Txn) error {
+		opts := badger.DefaultIteratorOptions
+		// can customize options down here if we want
+		iter := txn.NewIterator(opts)
+		defer iter.Close()
+		for iter.Rewind(); iter.Valid(); iter.Next() {
+			item := iter.Item()
+			key := string(item.Key())
+			err := viewFunc(key)
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	return err
+}