public double AddOrUpdateUsdExchangeRates()
{
if (_usdBtcExchangeRate == null)
{
var cryptoCompareResult = CryptoCompareService.GetUsdBtcExchangeRate();
_usdBtcExchangeRate = cryptoCompareResult.ExchangeRates.Values.FirstOrDefault();
}
return(_usdBtcExchangeRate.Value);
}
public void UpdateUsdExchangeRates()
{
using (GmiUnitOfWork gmiUnitOfWork = new GmiUnitOfWork())
{
//Get Coins from DB,
int allCoinsInDBCount = gmiUnitOfWork.GenericRepository.Count(new SearchCriteria <Coin>(int.MaxValue, 1)
{
FilterExpression = c => c.Difficulty > 0 && c.BlockReward > 0 && c.LastBlock > 0
});
int pageNumber = 1;
int pageSize = 30;
int lastPage = (int)Math.Ceiling((double)allCoinsInDBCount / pageSize);
string usdCode = "USD";
while (pageNumber <= lastPage)
{
var searchCriteria = new SearchCriteria <Coin>(pageSize, pageNumber)
{
FilterExpression = c => c.Difficulty > 0 && c.BlockReward > 0 && c.LastBlock > 0
};
var partialResult = gmiUnitOfWork.GenericRepository.Search(searchCriteria).Result;
var coinNames = partialResult.Select(s => s.Tag.ToUpper()).ToList();
List <CryptoComparePriceResult> exchangeRatesPartial = CryptoCompareService.GetCryptoComparePriceExchangeRateMultiSource(coinNames, usdCode);
foreach (var cryptoComparePriceResult in exchangeRatesPartial)
{
var coin = partialResult.FirstOrDefault(c =>
c.Tag.ToUpper() == cryptoComparePriceResult.SourceCurrenceCode.ToUpper());
if (coin == null)
{
continue;
}
coin.ExchangeRateUsd = cryptoComparePriceResult.ExchangeRates[usdCode];
}
pageNumber++;
}
gmiUnitOfWork.Commit();
}
}
public double GetLiveUsdExchangeRate(string cryptoCurrencyCode)
{
return(CryptoCompareService.GetCryptoComparePriceExchangeRate(cryptoCurrencyCode, "USD")?.ExchangeRates.Values.FirstOrDefault() ?? 0);
}
