private void RequestExchangeRates(int attemptNumber)
{
if (attemptNumber > MAX_LOOKUP_ATTEMPTS)
{
return;
}
try
{
Logger.Log(this, "Looking up the latest currency exchange rates");
var jsonObj = MiscTools.GetJson($"http://api.fixer.io/latest?base=EUR");
exchangeRates = new Dictionary <string, decimal>();
foreach (var prop in jsonObj["rates"].Children().Cast <JProperty>())
{
exchangeRates[prop.Name] = (decimal)prop.Value;
}
Logger.Log(this, $"Exchange rates for {exchangeRates.Count + 1} currencies have been updated.");
}
catch (WebException e) when(e.Message == "The request timed out" || e.Message == "The remote server returned an error: (500) Internal Server Error.")
{
Logger.Log(this, $"A server error occurred while updating the currency exhange rates. Retrying in {attemptNumber} seconds...");
Task.Delay(TimeSpan.FromSeconds(attemptNumber)).ContinueWith(_ => RequestExchangeRates(++attemptNumber));
}
catch (Exception e)
{
Logger.LogException(this, e, "updating the currency exchange rates");
RequestExchangeRates(++attemptNumber);
}
}