Golang : Byte insert into [ ] byte - arrays

Question

I'm working on GRPC stream, In server side, I receive the multiple byte inside the for loop, I want to merge in a single array of byte (I tried append method but not use), Here I have attached my sample code. Any one guide me.
Example code
func (s *ServerGRPC) Upload(stream pb.GuploadService_UploadServer) (err error) {
for {
resp, err := stream.Recv()
if err != nil {
if err == io.EOF {
goto END
}
err = errors.Wrapf(err,
"failed unexpectadely while reading chunks from stream")
return err
}
for _, result := range resp.Content {
fmt.Println("result ====>>>", result)
//Actual Output
//result ====>>> 136
//result ====>>> 84
//result ====>>> 232
//result ====>>> 12
//Expectation
//result ===> [136 84 232 12]
}
}
s.logger.Info().Msg("upload received")
END:
err = stream.SendAndClose(&pb.UploadStatus{
Message: "Upload received with success",
Code: pb.UploadStatusCode_Ok,
})
if err != nil {
err = errors.Wrapf(err,
"failed to send status code")
return
}
return
}

Answer 1

You are appending to Sample but printing req.Content
There is nothing wrong with merging slices. if just have to print Sample to see merged result.

Answer 2

func (s *ServerGRPC) Upload(stream pb.GuploadService_UploadServer) (err error) {
var respBytes []byte
for {
resp, err := stream.Recv()
if err != nil {
if err == io.EOF {
goto END // you can use break here
}
err = errors.Wrapf(err,
"failed unexpectadely while reading chunks from stream")
return err
}
for _, result := range resp.Content {
fmt.Println("result ====>>>", result)
respBytes = append(respBytes, result)
}
}
s.logger.Info().Msg("upload received")
// print respBytes here
END:
err = stream.SendAndClose(&pb.UploadStatus{
Message: "Upload received with success",
Code: pb.UploadStatusCode_Ok,
})
if err != nil {
err = errors.Wrapf(err,
"failed to send status code")
return
}
return
}