private static void GetRatesFromAPI(ref List <APICurrencyRates> rates, Sources source)
{
if (rates.Any())
{
//get rate from api
if (source == Sources.CurrencyLayer)
{
if (!rates.Any(r => r.CurrencyCdFrom == "USD")) //if usd isn't the list, need it to be, so create them
{
CurrencySourceLists sourceList = new CurrencySourceLists(getActiveOnly, SourceCodes[(int)source]);
List <CurrencySource> usdOnly = new List <CurrencySource>();
usdOnly.Add(new CurrencySource {
CurrencyCd = "USD", SourceFrom = "LAYER", SourceTo = "LAYER", Active = true
});
rates.AddRange(CreateCurrencyPairsForSourceListAsync(sourceList, usdOnly, source).Result); //build all the pairs for usd that are in the database and add
}
//Debug.WriteLine("calling currencylayer");
Data.APIHandlers.CurrencyLayerAPIHandler clAPI = new Data.APIHandlers.CurrencyLayerAPIHandler();
List <Data.Entities.BasicRateEntity> clRates = clAPI.GetUSDCurrencyRates();
//Debug.WriteLine("have rates?:" + clRates.Any());
foreach (Data.Entities.BasicRateEntity clr in clRates)
{
if (clr.CurrencyFrom != null)
{
APICurrencyRates ar = rates.SingleOrDefault(rr => rr.CurrencyCdFrom == clr.CurrencyFrom && rr.CurrencyCdTo == clr.CurrencyTo);
if (ar != null)
{
ar.Rate = clr.Rate;
ar.TimeUpdated = clr.TimeUpdated;
}
}
}
if (clRates.Any())
{
CalculateCrossRates(ref rates, clRates.FirstOrDefault().CurrencyFrom);
CalculateOppositePairsAndAddToList(ref rates);
}
// Debug.WriteLine("Done currencylayer");
}
else if (source == Sources.Cryptonator)
{
//use btc if in db, else just get the first one and deal
string baseRate = (rates.Any(r => r.CurrencyCdFrom == "BTC")) ? "BTC" : rates.FirstOrDefault(r => r.Rate == -1).CurrencyCdFrom;
IEnumerable <APICurrencyRates> nextBaseRates = rates.Where(r => r.CurrencyCdFrom == baseRate);
//Debug.WriteLine("got base rates to call: " + nextBaseRates.Any());
// while (.Any()) //while pairs in the queue
for (int i = 0; i < nextBaseRates.Count(); i++)
{
APICurrencyRates pair = nextBaseRates.ElementAt(i); //calculateQueue.Dequeue();
//call api handler
Data.APIHandlers.CryptonatorAPIHandler crAPI = new Data.APIHandlers.CryptonatorAPIHandler();
BasicRateEntity clr = crAPI.GetRateForCurrency(pair.CurrencyPairID);
Debug.WriteLine("rate retrieved");
//we got something back
if (clr.CurrencyFrom != null)
{
//update the rate
APICurrencyRates ar = rates.SingleOrDefault(rr => rr.CurrencyCdFrom == clr.CurrencyFrom && rr.CurrencyCdTo == clr.CurrencyTo);
if (ar != null)
{
ar.Rate = clr.Rate;
ar.TimeUpdated = clr.TimeUpdated;
}
}
}
//then see if we can calculate any other pairs from this call given a pair set using cross rates. This keeps the api calls down, hopefully.
CalculateCrossRates(ref rates, baseRate);
CalculateOppositePairsAndAddToList(ref rates); //this should also keep calls down, doing this here.
//Debug.WriteLine("Done crypto");
}
else if (source == Sources.Yahoo)
{
//nothing right now
}
else
{
throw new NotSupportedException("The source provided is not a supported currency source.");
}
}
}
