Method BidirectionalStreamingEcho

examples/features/metadata/server/main.go:156–195

(stream pb.Echo_BidirectionalStreamingEchoServer)

}

func (s *server) BidirectionalStreamingEcho(stream pb.Echo_BidirectionalStreamingEchoServer) error {
	fmt.Printf("--- BidirectionalStreamingEcho ---\n")
	// Create trailer in defer to record function return time.
	defer func() {
		trailer := metadata.Pairs("timestamp", time.Now().Format(timestampFormat))
		stream.SetTrailer(trailer)
	}()

	// Read metadata from client.
	md, ok := metadata.FromIncomingContext(stream.Context())
	if !ok {
		return status.Errorf(codes.DataLoss, "BidirectionalStreamingEcho: failed to get metadata")
	}

	if t, ok := md["timestamp"]; ok {
		fmt.Printf("timestamp from metadata:\n")
		for i, e := range t {
			fmt.Printf(" %d. %s\n", i, e)
		}
	}

	// Create and send header.
	header := metadata.New(map[string]string{"location": "MTV", "timestamp": time.Now().Format(timestampFormat)})
	stream.SendHeader(header)

	// Read requests and send responses.
	for {
		in, err := stream.Recv()
		if err == io.EOF {
			return nil
		}
		if err != nil {
			return err
		}
		fmt.Printf("request received %v, sending echo\n", in)
		if err := stream.Send(&pb.EchoResponse{Message: in.Message}); err != nil {
			return err
		}
	}
}

func main() {
	flag.Parse()