Md Mofijur Rahman

1// High-throughput order processing flow (Golang)
2
3func (s *OrderService) ProcessOrder(ctx context.Context, order *pb.OrderRequest) (*pb.OrderResponse, error) {
4    // 1. Validate and Parse with high-performance logic
5    if err := s.validator.Validate(order); err != nil {
6        return nil, status.Errorf(codes.InvalidArgument, "invalid order: %v", err)
7    }
8
9    // 2. Persist to PostgreSQL via sqlc for low-latency writes
10    savedOrder, err := s.queries.CreateOrder(ctx, db.CreateOrderParams{
11        Symbol:    order.Symbol,
12        Price:     order.Price,
13        Quantity:  order.Quantity,
14        Side:      order.Side,
15    })
16
17    // 3. Publish to Kafka for asynchronous downstream processing
18    payload, _ := json.Marshal(savedOrder)
19    err = s.kafkaWriter.WriteMessages(ctx, kafka.Message{
20        Key:   []byte(savedOrder.OrderID.String()),
21        Value: payload,
22    })
23
24    // 4. Update real-time state in Redis for fast retrieval
25    s.redis.Set(ctx, fmt.Sprintf("order:%s", savedOrder.OrderID), payload, time.Hour)
26
27    return &pb.OrderResponse{
28        OrderId: savedOrder.OrderID.String(),
29        Status:  "ACCEPTED",
30    }, nil
31}