swarm/network: fix light node code so that it compiles

swarm/network/light/lightnode.go

@@ -117,6 +117,8 @@ func (r *RemoteSectionReader) Read(b []byte) (n int64, err error) {
 	}
 }
 
+func (r *RemoteSectionReader) Close() {}
+
 // RemoteSectionServer implements OutgoingStreamer
 type RemoteSectionServer struct {
 	// quit chan struct{}
@@ -134,12 +136,12 @@ func NewRemoteSectionServer(db *storage.DBAPI, r *storage.LazyChunkReader) *Remo
 }
 
 // GetData retrieves the actual chunk from localstore
-func (s *RemoteSectionServer) GetData(key []byte) []byte {
+func (s *RemoteSectionServer) GetData(key []byte) ([]byte, error) {
 	chunk, err := s.db.Get(storage.Key(key))
 	if err != nil {
-		return nil
+		return nil, err
 	}
-	return chunk.SData
+	return chunk.SData, nil
 }
 
 // GetBatch retrieves the next batch of hashes from the dbstore
@@ -152,6 +154,8 @@ func (s *RemoteSectionServer) SetNextBatch(from, to uint64) ([]byte, uint64, uin
 	return batch, from, to, nil, nil
 }
 
+func (s *RemoteSectionServer) Close() {}
+
 // RegisterRemoteSectionReader registers RemoteSectionReader on light downstream node
 func RegisterRemoteSectionReader(s *stream.Registry, db *storage.DBAPI) {
 	s.RegisterClientFunc("REMOTE_SECTION", func(p *stream.Peer, t []byte) (stream.Client, error) {

swarm/network/simulations/discovery/discovery.go

@@ -0,0 +1 @@
+package discovery

swarm/network/simulations/discovery/discovery_test.go

@@ -1,4 +1,4 @@
-package discovery_test
+package discovery
 
 import (
 	"context"