func readEntryFrom(r io.Reader, ent *raftpb.Entry) error {
var l uint64
if err := binary.Read(r, binary.BigEndian, &l); err != nil {
return err
}
buf := make([]byte, int(l))
if _, err := io.ReadFull(r, buf); err != nil {
return err
}
return ent.Unmarshal(buf)
}
