public override async Task <decimal> GetExchangeRateAsync(Money.CurrencyType c1, Money.CurrencyType c2)
{
await exchangeRateLock.WaitAsync();
try {
if (ExchangeRateCache.ContainsKey(c2))
{
return(1m / (await GetExchangeRateAsync(c2, c1)));
}
if (!ExchangeRateCache.ContainsKey(c1))
{
ExchangeRateCache.Add(c1, new Dictionary <Money.CurrencyType, ExchangeRateInfo>());
}
if (ExchangeRateCache[c1].ContainsKey(c2))
{
if (ExchangeRateCache[c1][c2].Age <= MaxExchangeRateAge)
{
return(ExchangeRateCache[c1][c2].Rate);
}
ExchangeRateCache[c1].Remove(c2);
}
decimal rate = await base.GetExchangeRateAsync(c1, c2);
ExchangeRateCache[c1].Add(c2, new ExchangeRateInfo(rate));
return(rate);
}
finally {
exchangeRateLock.Release();
}
}
public async override Task <decimal> GetExchangeRateAsync(Money.CurrencyType c1, Money.CurrencyType c2)
{
if (c2 != Money.CurrencyType.FindByCode("BTC"))
{
return(await NextProtocol.GetExchangeRateAsync(c1, c2));
}
return(GetExchangeRate(c1, c2, await GetJsonAsync("/ticker")));
}
static decimal GetExchangeRate(Money.CurrencyType c1, Money.CurrencyType c2, JToken rates)
{
if (c2 != Money.CurrencyType.FindByCode("BTC"))
{
throw new NotImplementedException();
}
JToken rate = rates[c1.Code];
if (rate == null)
{
throw new Money.UnknownExchangeRateException();
}
return(rates[c1.Code]["last"].Value <decimal>());
}
public static async Task <decimal> GetExchangeRateAsync(Money.CurrencyType c1, Money.CurrencyType c2)
{
return(await Protocol.GetExchangeRateAsync(c1, c2));
}
public static Money Sum(this IEnumerable <Money> source)
{
Money.CurrencyType currency = source.Any() ? source.First().Currency : Money.DefaultCurrencyType;
return(source.Aggregate(new Money(0, currency), (a, b) => a + b));
}
