Created
September 20, 2024 17:12
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| package payment | |
| import ( | |
| "database/sql" | |
| "errors" | |
| "github.com/google/uuid" | |
| ) | |
| type PaymentRequest struct { | |
| UserID string | |
| Amount float64 | |
| IdempotentKey string | |
| } | |
| type PaymentService struct { | |
| DB *sql.DB | |
| } | |
| func (s *PaymentService) ProcessPayment(request PaymentRequest) error { | |
| // ตรวจสอบว่า Idempotent Key ถูกใช้งานไปหรือยัง | |
| var existingPaymentID string | |
| err := s.DB.QueryRow("SELECT id FROM payments WHERE idempotent_key = ?", request.IdempotentKey).Scan(&existingPaymentID) | |
| if err != nil && err != sql.ErrNoRows { | |
| return err | |
| } | |
| // ถ้า Idempotent Key มีอยู่แล้ว แสดงว่าคำขอถูกประมวลผลแล้ว | |
| if existingPaymentID != "" { | |
| return errors.New("payment already processed") | |
| } | |
| // เริ่มการประมวลผลธุรกรรม | |
| tx, err := s.DB.Begin() | |
| if err != nil { | |
| return err | |
| } | |
| _, err = tx.Exec("INSERT INTO payments (user_id, amount, idempotent_key) VALUES (?, ?, ?)", request.UserID, request.Amount, request.IdempotentKey) | |
| if err != nil { | |
| tx.Rollback() | |
| return err | |
| } | |
| // ยืนยันการทำธุรกรรม | |
| err = tx.Commit() | |
| if err != nil { | |
| return err | |
| } | |
| return nil | |
| } |
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