public async Task <ConvertedCurrencyDto> Handle(CurrencyExchangeRequest request,
CancellationToken cancellationToken)
{
// Note: Applied robustness principle in this case.
// Another option is to only accepts requests with exact API contract
try
{
var exchangeRate = await _exchangeRateService.GetRate(request.SourceCurrency,
request.TargetCurrency);
var result = new ConvertedCurrencyDto
{
ConvertedAmount = request.Amount * exchangeRate,
TargetCurrency = request.TargetCurrency
};
return(result);
}
catch (Exception e)
{
_logger.LogError(_logFormatter.FormatMessage(LogType.Error, ""), e);
throw;
}
}
public IOrder ConvertToAnotherCurrency(IOrder order, string currencyCode)
{
var newOrder = _factory.Create();
foreach (var item in order.GetItems())
{
var newItem = new Item(item.Article, item.Count * (int)_exchangeRateService.GetRate("CZK"));
newOrder.AddItem(newItem);
}
return(newOrder);
}
private async Task HandleGetExchangeRateRequest(string userId, string currencyFrom, string currencyTo)
{
decimal rate = 0;
try
{
rate = await _service.GetRate(currencyFrom, currencyTo);
}
catch (Exception e)
{
_logger.Error(e, "Error while try to get exchange rate");
var serviceUnawailableMessage = _helpCommandTextBuilder.BuildErrorMessage(e);
await _provider.SendMessage(userId, serviceUnawailableMessage);
throw;
}
string response = $"1 {currencyFrom} = {rate} {currencyTo} {UserCommands.GetHelp}";
await _provider.SendMessage(userId, response);
}