service backend

api/fx/storage/storage.go

@@ -0,0 +1,53 @@
+package storage
+
+import (
+	"context"
+	"time"
+
+	"github.com/tech/sendico/fx/storage/model"
+)
+
+type storageError string
+
+func (e storageError) Error() string {
+	return string(e)
+}
+
+var (
+	ErrQuoteExpired         = storageError("fx.storage: quote expired")
+	ErrQuoteConsumed        = storageError("fx.storage: quote consumed")
+	ErrQuoteNotFirm         = storageError("fx.storage: quote is not firm")
+	ErrQuoteConsumptionRace = storageError("fx.storage: quote consumption collision")
+)
+
+type Repository interface {
+	Ping(ctx context.Context) error
+	Rates() RatesStore
+	Quotes() QuotesStore
+	Pairs() PairStore
+	Currencies() CurrencyStore
+}
+
+type RatesStore interface {
+	UpsertSnapshot(ctx context.Context, snapshot *model.RateSnapshot) error
+	LatestSnapshot(ctx context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error)
+}
+
+type QuotesStore interface {
+	Issue(ctx context.Context, quote *model.Quote) error
+	GetByRef(ctx context.Context, quoteRef string) (*model.Quote, error)
+	Consume(ctx context.Context, quoteRef, ledgerTxnRef string, when time.Time) (*model.Quote, error)
+	ExpireIssuedBefore(ctx context.Context, cutoff time.Time) (int, error)
+}
+
+type PairStore interface {
+	ListEnabled(ctx context.Context) ([]*model.Pair, error)
+	Get(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error)
+	Upsert(ctx context.Context, p *model.Pair) error
+}
+
+type CurrencyStore interface {
+	Get(ctx context.Context, code string) (*model.Currency, error)
+	List(ctx context.Context, codes ...string) ([]*model.Currency, error)
+	Upsert(ctx context.Context, currency *model.Currency) error
+}