func (s *codec) writeHeaderData(header *rpc4.Header, data []byte) (err error) {
if len(data) > 0 {
header.PayloadPresent = proto.Bool(true)
}
if err = writeProto(s.w, header); err == nil && header.GetPayloadPresent() {
err = writeData(s.w, data)
}
return
}
func (s *codec) WriteResponse(resp *rpc.Response, pb interface{}) error {
var header rpc4.Header
header.Method, header.Sequence, header.MessageType = &resp.ServiceMethod, &resp.Seq, rpc4.Header_RESPONSE.Enum()
var data []byte
if resp.Error == "" {
var err error
if data, err = proto.Marshal(pb.(proto.Message)); err != nil {
resp.Error = err.Error()
}
}
if resp.Error != "" {
header.MessageType = rpc4.Header_ERROR.Enum()
data = []byte(resp.Error)
}
return s.writeHeaderData(&header, data)
}
func (s *codec) ReadResponseHeader(resp *rpc.Response) error {
if s.Shutdown {
return rpc.ErrShutdown
}
var header rpc4.Header
if err := readProto(s.r, &header); err != nil {
return err
}
if header.GetMethod() == "" {
return fmt.Errorf("header missing method: %s", header)
}
resp.ServiceMethod = header.GetMethod()
resp.Seq = header.GetSequence()
s.responsePayload = header.GetPayloadPresent()
return nil
}