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();
}
}
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 List<Transaction.Output> SelectInpoints(List<Transaction.Output> availableInpoints, Money amountToSend, Money fee, out Money change) {
var selectedInpoints = new List<Transaction.Output>();
foreach(var output in availableInpoints) {
if(selectedInpoints.Select(o => o.Value).Sum() >= amountToSend + fee) break;
selectedInpoints.Add(output);
}
Money selectedTotal = selectedInpoints.Select(o => o.Value).Sum();
if(selectedTotal < amountToSend + fee)
throw new InsufficientFundsException();
change = selectedTotal - (amountToSend + fee);
return selectedInpoints;
}
public virtual Money ExchangeWith(Money money, CurrencyType currency) {
return Money.Create(money.Currency == currency ? money.Value : money.Value * GetRate(from: money.Currency, to: currency), currency);
}
public Delta(Transaction tx, Money value) {
Transaction = tx;
Value = value;
}
public static async Task<decimal> GetExchangeRateAsync(Money.CurrencyType c1, Money.CurrencyType c2) {
return await Protocol.GetExchangeRateAsync(c1, c2);
}
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"));
}
protected void ReadFromJson(JToken data) {
Value = Money.Create(Decimal.Parse(data["value"].Value<string>()), "BTC");
// Console.WriteLine("BTC: {0}\nSAT: {1}", btc, Value);
ScriptPubKey = Script.FromString(data["scriptPubKey"].Value<string>());
}
protected void ReadPayload(BinaryReader reader) {
Value = new Money(reader.ReadInt64(), "BTC");
UInt64 scriptLength = VarInt.Read(reader).Value;
ScriptPubKey = new Script(reader.ReadBytes((int)scriptLength));
}
public Output(Script scriptPubKey, Money value, Transaction transaction = null, UInt32 index = 0) {
ScriptPubKey = scriptPubKey;
Value = value;
Transaction = transaction;
Index = index;
}
public static List<Transaction.Output> SelectInpoints(List<Transaction.Output> availableInpoints, Dictionary<Address, Money> destinations, Money fee, out Money change) {
return SelectInpoints(availableInpoints, destinations.Values.Sum(), fee, out change);
}
public static List<Transaction.Output> SelectInpoints(List<Transaction.Output> availableInpoints, Dictionary<Address, Money> destinations, out Money change) {
long approxNumberOfInputs = SelectInpoints(availableInpoints, destinations, new Money(0, "BTC"), out change).Count + 1;
return SelectInpoints(availableInpoints, destinations, ApproxFeeForTx(approxNumberOfInputs, destinations.Count + 1), out change);
}
