cb18dc77fc
this service exists to do currency conversions, which is the best I can assume that this was meant to be named. Change-Id: Ia2416f5475749e8bfe8d05bf491649576f6d77bf
76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package stripecoinpayments
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import (
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"context"
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"math"
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"math/big"
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"time"
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"github.com/zeebo/errs"
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"go.uber.org/zap"
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"storj.io/common/sync2"
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)
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// convertToCents convert amount to cents with given rate.
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func convertToCents(rate, amount *big.Float) int64 {
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f, _ := new(big.Float).Mul(amount, rate).Float64()
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return int64(math.Round(f * 100))
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}
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// convertFromCents convert amount in cents to big.Float with given rate.
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func convertFromCents(rate *big.Float, amount int64) *big.Float {
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a := new(big.Float).SetInt64(amount)
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a = a.Quo(a, new(big.Float).SetInt64(100))
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return new(big.Float).Quo(a, rate)
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}
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// ErrConversion defines version service error.
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var ErrConversion = errs.Class("conversion service")
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// ConversionService updates conversion rates in a loop.
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//
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// architecture: Service
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type ConversionService struct {
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log *zap.Logger
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service *Service
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Cycle sync2.Cycle
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}
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// NewConversionService creates new instance of ConversionService.
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func NewConversionService(log *zap.Logger, service *Service, interval time.Duration) *ConversionService {
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return &ConversionService{
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log: log,
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service: service,
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Cycle: *sync2.NewCycle(interval),
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}
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}
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// Run runs loop which updates conversion rates for service.
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func (conversion *ConversionService) Run(ctx context.Context) (err error) {
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defer mon.Task()(&ctx)(&err)
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return ErrConversion.Wrap(conversion.Cycle.Run(ctx,
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func(ctx context.Context) error {
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conversion.log.Debug("running conversion rates update cycle")
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if err := conversion.service.UpdateRates(ctx); err != nil {
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conversion.log.Error("conversion rates update cycle failed", zap.Error(ErrChore.Wrap(err)))
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}
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return nil
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},
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))
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}
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// Close closes underlying cycle.
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func (conversion *ConversionService) Close() (err error) {
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defer mon.Task()(nil)(&err)
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conversion.Cycle.Close()
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return nil
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}
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