private async Task <decimal> GetExchangeRateAsync()
{
var ukrainianNow = TimeZones.GetTimeZoneNow(TimeZones.UkrainianTime);
const string LocalCurrencyCode = "UAH";
const string ForeignCurrencyCode = "PLN";
// todo: cache
var exchangeRate = await _centralBankExchangeRateManager.GetCurrentRateAsync(LocalCurrencyCode, ForeignCurrencyCode, ukrainianNow);
if (exchangeRate == null)
{
throw new InvalidOperationException($"CB exchange rate for {LocalCurrencyCode}-{ForeignCurrencyCode} is not presented.");
}
return(exchangeRate.Value);
}
public async Task AutoUpdateRatesAsync(CancellationToken cancellationToken)
{
try
{
// NBU
string nbuRatesStatusMessage;
var nbuRates = await _uaCentralBankApiProxy.GetRatesAsync();
if (nbuRates.Count > 0)
{
var lastAppliedNbuRatesDateString = await _persistentCache.GetValueAsync(LastAppliedNbuRatesDateKey, cancellationToken);
// at the moment NBU returns rates only for one date
var nbuRateDate = nbuRates[0].Date;
var nbuRateDateString = nbuRateDate.ToString("yyyy-MM-dd");
if (lastAppliedNbuRatesDateString == nbuRateDateString)
{
nbuRatesStatusMessage = $"INFO: NBU rates are already updated to {nbuRateDateString}.";
}
else
{
// tomorrow 00:00
var uahRateUpdateStartTime = TimeZones.GetTimeZoneNow(TimeZones.UkrainianTime).Date.AddDays(1);
var uahRates = await _dbContext.CentralBankExchangeRates
.Where(x => x.LocalCurrencyCode == "UAH")
.Select(x => new
{
x.Id,
x.LocalCurrencyCode,
x.ForeignCurrencyCode,
})
.ToArrayAsync(cancellationToken);
var updatedCurrencies = new List <string>();
foreach (var uahRate in uahRates)
{
var nbuRate = nbuRates
.Where(x => x.LocalCurrencyCode == uahRate.LocalCurrencyCode &&
x.ForeignCurrencyCode == uahRate.ForeignCurrencyCode)
.FirstOrDefault();
if (nbuRate != null)
{
_dbContext.CentralBankExchangeRateUpdates.Add(
new CentralBankExchangeRateUpdate()
{
CentralBankExchangeRateId = uahRate.Id,
Rate = nbuRate.Rate,
StartTime = uahRateUpdateStartTime,
});
updatedCurrencies.Add(nbuRate.ForeignCurrencyCode);
}
}
await _dbContext.SaveChangesAsync(cancellationToken);
await _persistentCache.SetValueAsync(LastAppliedNbuRatesDateKey, nbuRateDateString, CancellationToken.None);
nbuRatesStatusMessage = $"SUCCESS: NBU rates for {string.Join(", ", updatedCurrencies)} were updated to {nbuRateDateString}.";
}
}
else
{
nbuRatesStatusMessage = "WARNING: No NBU rates.";
}
await _notificationManager.SendWorkerMessageAsync(nbuRatesStatusMessage);
}
catch (Exception ex)
{
_logger.LogError(LoggingEvents.UnhandledException, ex, $"{nameof(AutoUpdateRatesAsync)} failed.");
await _notificationManager.SendWorkerMessageAsync($"ERROR: {nameof(AutoUpdateRatesAsync)} failed: {ex.Message}.");
}
}