public override WalletError Consolidate(IEnumerable <string> tagFrom, string tagTo, BigInteger feeMax, BigInteger feeUnit, out IEnumerable <WalletTx> wtxs, int minConfs = 0, string replaceTxId = null)
{
wtxs = new List <WalletTx>();
// generate new address to send to
var to = NewOrUnusedAddress(tagTo);
// calc amount in tagFrom
BigInteger amount = 0;
foreach (var tag in tagFrom)
{
amount += this.GetBalance(tag);
}
// check we have enough funds
if (amount <= 0)
{
logger.LogError("insufficient funds: balance is less then or equal to 0");
return(WalletError.InsufficientFunds);
}
// create tx template with destination as first output
var tx = Transaction.Create(GetNetwork());
var money = new Money((ulong)amount);
var toaddr = BitcoinAddress.Create(to.Address, GetNetwork());
var output = tx.Outputs.Add(money, toaddr);
// create list of candidate coins to spend based on (a tx we might want to replace and) UTXOs from the selected tag
var candidates = new List <CoinCandidate>();
if (replaceTxId != null)
{
// if we are replacing a tx we need to replace at least one of its inputs
var replaceTx = GetTransaction(replaceTxId);
if (replaceTx == null)
{
return(WalletError.NothingToReplace);
}
var res = WalletError.UnableToReplace;
foreach (var tag in tagFrom)
{
var addrs = GetAddresses(tag);
if (UseReplacedTxCoins(addrs, candidates, replaceTxId, replaceTx) == WalletError.Success)
{
res = WalletError.Success;
}
}
if (res != WalletError.Success)
{
return(res);
}
}
var utxos = GetClient().GetUTXOs(pubkey);
foreach (var tag in tagFrom)
{
var addrs = GetAddresses(tag);
UseUtxoCoins(addrs, candidates, utxos, minConfs);
}
// add all inputs so we can satisfy our output
BigInteger totalInput = 0;
var toBeSpent = new List <CoinSpend>();
foreach (var candidate in candidates)
{
// add to list of coins and private keys to spend
var txin = new TxIn(candidate.Coin.Outpoint);
txin.Sequence = 0; // RBF: BIP125
tx.Inputs.Add(txin);
totalInput += candidate.Coin.Amount.Satoshi;
var privateKey = key.ExtKey.Derive(new KeyPath(candidate.Addr.Path)).PrivateKey;
toBeSpent.Add(new CoinSpend(candidate.Addr.Address, candidate.Addr, candidate.Coin, privateKey));
}
// check we have enough inputs
if (totalInput < amount)
{
logger.LogError("insufficient funds: total inputs are less then sending amount");
return(WalletError.InsufficientFunds);
}
// adjust fee rate by reducing the output incrementally
var feeRate = new FeeRate(new Money(0L));
decimal currentSatsPerByte = 0;
while (currentSatsPerByte < (decimal)feeUnit)
{
tx.Outputs[0].Value -= 1L;
amount -= 1;
if (amount <= 0)
{
logger.LogError("insufficient funds: after fees the amount sent is 0");
return(WalletError.InsufficientFunds);
}
feeRate = GetFeeRate(tx, toBeSpent);
currentSatsPerByte = feeRate.SatoshiPerByte;
}
// sign inputs
var coins = from a in toBeSpent select a.Coin;
var keys = from a in toBeSpent select a.Key;
// check coins are represented as incoming wallet txs
CheckCoinsAreInWallet(candidates, utxos.CurrentHeight);
tx.Sign(keys.ToArray(), coins.ToArray());
// recalculate fee rate and check it is less then the max fee
var fee = tx.GetFee(coins.ToArray());
if (fee.Satoshi > feeMax)
{
return(WalletError.MaxFeeBreached);
}
// broadcast transaction
var result = GetClient().Broadcast(tx);
if (result.Success)
{
// log outgoing transaction
var coinOutput = new CoinOutput(to.Address, amount);
var wtxs_ = AddOutgoingTx(tx, toBeSpent, new List <CoinOutput> {
coinOutput
}, fee.Satoshi, null);
((List <WalletTx>)wtxs).AddRange(wtxs_);
return(WalletError.Success);
}
else
{
logger.LogError("{0}, {1}, {2}", result.RPCCode, result.RPCCodeMessage, result.RPCMessage);
return(WalletError.FailedBroadcast);
}
}
public override WalletError Spend(string tag, string tagChange, string to, BigInteger amount, BigInteger feeMax, BigInteger feeUnit, out IEnumerable <WalletTx> wtxs, WalletTag tagFor = null, string replaceTxId = null)
{
wtxs = new List <WalletTx>();
var tagChange_ = db.TagGet(tagChange);
Util.WalletAssert(tagChange_ != null, $"Tag '{tagChange}' does not exist");
// create tx template with destination as first output
var tx = Transaction.Create(GetNetwork());
var money = new Money((ulong)amount);
var toaddr = BitcoinAddress.Create(to, GetNetwork());
var output = tx.Outputs.Add(money, toaddr);
// create list of candidate coins to spend based on (a tx we might want to replace and) UTXOs from the selected tag
var addrs = GetAddresses(tag);
var candidates = new List <CoinCandidate>();
var res = UseReplacedTxCoins(addrs, candidates, replaceTxId);
if (res != WalletError.Success)
{
return(res);
}
var utxos = GetClient().GetUTXOs(pubkey);
UseUtxoCoins(addrs, candidates, utxos);
// add inputs until we can satisfy our output
BigInteger totalInput = 0;
var toBeSpent = new List <CoinSpend>();
foreach (var candidate in candidates)
{
// add to list of coins and private keys to spend
var txin = new TxIn(candidate.Coin.Outpoint);
txin.Sequence = 0; // RBF: BIP125
tx.Inputs.Add(txin);
totalInput += candidate.Coin.Amount.Satoshi;
var privateKey = key.ExtKey.Derive(new KeyPath(candidate.Addr.Path)).PrivateKey;
toBeSpent.Add(new CoinSpend(candidate.Addr.Address, candidate.Addr, candidate.Coin, privateKey));
// check if we have enough inputs
if (totalInput >= amount)
{
// check if we have enough fee
if (GetFeeRate(tx, toBeSpent).SatoshiPerByte > (decimal)feeUnit)
{
break;
}
}
}
// check we have enough inputs
logger.LogDebug($"totalInput {totalInput}, amount: {amount}");
if (totalInput < amount)
{
logger.LogError("insufficient funds: total inputs are less then sending amount");
return(WalletError.InsufficientFunds);
}
// check fee rate
var feeRate = GetFeeRate(tx, toBeSpent);
if (feeRate.SatoshiPerByte > (decimal)feeUnit)
{
// create a change address
var changeAddress = AddChangeAddress(tagChange_);
// calculate the target fee
var currentFee = feeRate.GetFee(tx.GetVirtualSize());
var targetFee = tx.GetVirtualSize() * (long)feeUnit;
var changeOutput = new TxOut(currentFee - targetFee, changeAddress);
targetFee += output.GetSerializedSize() * (long)feeUnit;
// add the change output
changeOutput = tx.Outputs.Add(currentFee - targetFee, changeAddress);
}
else if (feeRate.SatoshiPerByte < (decimal)feeUnit)
{
logger.LogError($"insufficient funds: fee rate ({feeRate.SatoshiPerByte} sats/byte) is less then {feeUnit}");
return(WalletError.InsufficientFunds);
}
var coins = from a in toBeSpent select a.Coin;
var keys = from a in toBeSpent select a.Key;
// check coins are represented as incoming wallet txs
CheckCoinsAreInWallet(candidates, utxos.CurrentHeight);
// sign inputs (after adding a change output)
tx.Sign(keys.ToArray(), coins.ToArray());
// recalculate fee rate and check it is less then the max fee
var fee = tx.GetFee(coins.ToArray());
if (fee.Satoshi > feeMax)
{
return(WalletError.MaxFeeBreached);
}
// broadcast transaction
var result = GetClient().Broadcast(tx);
if (result.Success)
{
// log outgoing transaction
var coinOutput = new CoinOutput(to, amount);
var wtxs_ = AddOutgoingTx(tx, toBeSpent, new List <CoinOutput> {
coinOutput
}, fee.Satoshi, tagFor);
((List <WalletTx>)wtxs).AddRange(wtxs_);
return(WalletError.Success);
}
else
{
logger.LogError("{0}, {1}, {2}", result.RPCCode, result.RPCCodeMessage, result.RPCMessage);
return(WalletError.FailedBroadcast);
}
}
