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Persist last known exchange rates even if rate provider is down #163

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Merged
jeffyanta merged 1 commit into from
Mar 30, 2026
Merged

Persist last known exchange rates even if rate provider is down #163

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21 changes: 20 additions & 1 deletion ocp/worker/currency/exchangerate/runtime.go
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Original file line number Diff line number Diff line change
Expand Up @@ -13,12 +13,15 @@ import (

currency_lib "github.com/code-payments/ocp-server/currency"
ocp_data "github.com/code-payments/ocp-server/ocp/data"
"github.com/code-payments/ocp-server/ocp/data/currency"
"github.com/code-payments/ocp-server/ocp/worker"
)

type exchangeRateRuntime struct {
log *zap.Logger
data ocp_data.Provider

lastRates *currency.MultiRateRecord
}

func New(log *zap.Logger, data ocp_data.Provider) worker.Runtime {
Expand Down Expand Up @@ -70,7 +73,21 @@ func (p *exchangeRateRuntime) Start(runtimeCtx context.Context, interval time.Du
func (p *exchangeRateRuntime) GetCurrentExchangeRates(ctx context.Context) error {
data, err := p.data.GetCurrentExchangeRatesFromExternalProviders(ctx)
if err != nil {
return errors.Wrap(err, "failed to get current rate data")
p.log.With(zap.Error(err)).Warn("failed to get current rate data, persisting last known rates")

lastRates := p.lastRates
if lastRates == nil {
lastRates, _ = p.data.GetAllExchangeRates(ctx, time.Now())
}

if lastRates == nil {
return errors.Wrap(err, "failed to get current rate data")
}

data = &currency.MultiRateRecord{
Time: time.Now(),
Rates: lastRates.Rates,
}
}

delete(data.Rates, string(currency_lib.BTC))
Expand All @@ -97,5 +114,7 @@ func (p *exchangeRateRuntime) GetCurrentExchangeRates(ctx context.Context) error
return errors.Wrap(err, "failed to store rate data")
}

p.lastRates = data

return nil
}
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