storj/satellite/payments/stripecoinpayments/conversion.go

78 lines
2.0 KiB
Go
Raw Normal View History

// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package stripecoinpayments
import (
"context"
"time"
"github.com/shopspring/decimal"
"github.com/zeebo/errs"
"go.uber.org/zap"
"storj.io/common/currency"
"storj.io/common/sync2"
)
// convertToCents convert amount to USD cents with given rate.
func convertToCents(rate decimal.Decimal, amount currency.Amount) int64 {
amountDecimal := amount.AsDecimal()
usd := amountDecimal.Mul(rate)
usdCents := usd.Shift(2)
return usdCents.Round(0).IntPart()
}
// convertFromCents convert amount in cents to a StorjTokenAmount with given rate.
func convertFromCents(rate decimal.Decimal, usdCents int64) currency.Amount {
usd := decimal.NewFromInt(usdCents).Shift(-2)
numStorj := usd.Div(rate)
return currency.AmountFromDecimal(numStorj, currency.USDollars)
}
// ErrConversion defines version service error.
var ErrConversion = errs.Class("conversion service")
// ConversionService updates conversion rates in a loop.
//
// architecture: Service
type ConversionService struct {
log *zap.Logger
service *Service
Cycle sync2.Cycle
}
// NewConversionService creates new instance of ConversionService.
func NewConversionService(log *zap.Logger, service *Service, interval time.Duration) *ConversionService {
return &ConversionService{
log: log,
service: service,
Cycle: *sync2.NewCycle(interval),
}
}
// Run runs loop which updates conversion rates for service.
func (conversion *ConversionService) Run(ctx context.Context) (err error) {
defer mon.Task()(&ctx)(&err)
return ErrConversion.Wrap(conversion.Cycle.Run(ctx,
func(ctx context.Context) error {
conversion.log.Debug("running conversion rates update cycle")
if err := conversion.service.UpdateRates(ctx); err != nil {
conversion.log.Error("conversion rates update cycle failed", zap.Error(ErrChore.Wrap(err)))
}
return nil
},
))
}
// Close closes underlying cycle.
func (conversion *ConversionService) Close() (err error) {
defer mon.Task()(nil)(&err)
conversion.Cycle.Close()
return nil
}