storj/satellite/payments/stripecoinpayments/conversion.go
JT Olio cb18dc77fc satellite/stripecoinpayments: version is the wrong name
this service exists to do currency conversions, which is
the best I can assume that this was meant to be named.

Change-Id: Ia2416f5475749e8bfe8d05bf491649576f6d77bf
2021-06-29 15:31:11 +00:00

76 lines
1.9 KiB
Go

// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package stripecoinpayments
import (
"context"
"math"
"math/big"
"time"
"github.com/zeebo/errs"
"go.uber.org/zap"
"storj.io/common/sync2"
)
// convertToCents convert amount to cents with given rate.
func convertToCents(rate, amount *big.Float) int64 {
f, _ := new(big.Float).Mul(amount, rate).Float64()
return int64(math.Round(f * 100))
}
// convertFromCents convert amount in cents to big.Float with given rate.
func convertFromCents(rate *big.Float, amount int64) *big.Float {
a := new(big.Float).SetInt64(amount)
a = a.Quo(a, new(big.Float).SetInt64(100))
return new(big.Float).Quo(a, rate)
}
// 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
}