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repository.go
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repository.go
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package repository
import (
"github.com/dgraph-io/badger"
"github.com/google/uuid"
"github.com/mysza/paymentsapi/domain"
)
// PaymentsRepository provides access to the payments database.
type PaymentsRepository struct {
db *badger.DB
}
// New creates a new repository using SQLite database.
func New(db *badger.DB) *PaymentsRepository {
return &PaymentsRepository{db}
}
func (r *PaymentsRepository) set(payment *domain.Payment) error {
encoded, err := domain.PaymentToByteSlice(payment)
if err != nil {
return err
}
return r.db.Update(func(txn *badger.Txn) error {
err := txn.Set([]byte(payment.ID), encoded)
return err
})
}
// Add adds a payment to the database.
func (r *PaymentsRepository) Add(payment *domain.Payment) (string, error) {
payment.ID = uuid.New().String()
err := r.set(payment)
if err != nil {
return "", err
}
return payment.ID, nil
}
// Get retrieves single payment from the database.
func (r *PaymentsRepository) Get(id string) (*domain.Payment, error) {
var encodedPayment []byte
err := r.db.View(func(txn *badger.Txn) error {
item, err := txn.Get([]byte(id))
if err != nil {
return err
}
encodedPayment, err = item.ValueCopy(nil)
return err
})
if err != nil {
return nil, err
}
return domain.PaymentFromByteSlice(encodedPayment)
}
// GetAll retrieves all payments from the database.
func (r *PaymentsRepository) GetAll() ([]*domain.Payment, error) {
var encodedPayment []byte
var payments []*domain.Payment
err := r.db.View(func(txn *badger.Txn) error {
it := txn.NewIterator(badger.IteratorOptions{
PrefetchValues: true,
PrefetchSize: 100,
})
defer it.Close()
for it.Rewind(); it.Valid(); it.Next() {
encodedPayment, err := it.Item().ValueCopy(encodedPayment)
p, err := domain.PaymentFromByteSlice(encodedPayment)
if err != nil {
return err
}
payments = append(payments, p)
}
return nil
})
if err != nil {
return nil, err
}
return payments, nil
}
// Update updates a payment in the database.
func (r *PaymentsRepository) Update(payment *domain.Payment) error {
return r.set(payment)
}
// Delete deletes a payment from the database.
func (r *PaymentsRepository) Delete(id string) error {
return r.db.Update(func(txn *badger.Txn) error {
return txn.Delete([]byte(id))
})
}
// Exists is a helper function to check if payment with give ID exists.
func (r *PaymentsRepository) Exists(id string) bool {
payment, _ := r.Get(id)
return payment != nil
}