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sweep: allow specified outputs to sweep tx

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We'll use this to attach an output for the value reserved for anchor
commitments fee bumping if the user requests a send_all transaction.
This commit is contained in:
Johan T. Halseth
2021-01-14 11:49:27 +01:00
parent eaf97418be
commit 185ba77f8e
7 changed files with 80 additions and 33 deletions
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43
sweep/walletsweep.go
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@@ -148,13 +148,24 @@ type WalletSweepPackage struct {
CancelSweepAttempt func()
}
// DeliveryAddr is a pair of (address, amount) used to craft a transaction
// paying to more than one specified address.
type DeliveryAddr struct {
// Addr is the address to pay to.
Addr btcutil.Address
// Amt is the amount to pay to the given address.
Amt btcutil.Amount
}
// CraftSweepAllTx attempts to craft a WalletSweepPackage which will allow the
// caller to sweep ALL outputs within the wallet to a single UTXO, as specified
// by the delivery address. The sweep transaction will be crafted with the
// target fee rate, and will use the utxoSource and outpointLocker as sources
// for wallet funds.
// caller to sweep ALL outputs within the wallet to a list of outputs. Any
// leftover amount after these outputs and transaction fee, is sent to a single
// output, as specified by the change address. The sweep transaction will be
// crafted with the target fee rate, and will use the utxoSource and
// outpointLocker as sources for wallet funds.
func CraftSweepAllTx(feeRate chainfee.SatPerKWeight, dustLimit btcutil.Amount,
blockHeight uint32, deliveryAddr btcutil.Address,
blockHeight uint32, deliveryAddrs []DeliveryAddr, changeAddr btcutil.Address,
coinSelectLocker CoinSelectionLocker, utxoSource UtxoSource,
outpointLocker OutpointLocker, feeEstimator chainfee.Estimator,
signer input.Signer) (*WalletSweepPackage, error) {
@@ -261,9 +272,25 @@ func CraftSweepAllTx(feeRate chainfee.SatPerKWeight, dustLimit btcutil.Amount,
inputsToSweep = append(inputsToSweep, &input)
}
// Next, we'll convert the delivery addr to a pkScript that we can use
// Create a list of TxOuts from the given delivery addresses.
var txOuts []*wire.TxOut
for _, d := range deliveryAddrs {
pkScript, err := txscript.PayToAddrScript(d.Addr)
if err != nil {
unlockOutputs()
return nil, err
}
txOuts = append(txOuts, &wire.TxOut{
PkScript: pkScript,
Value: int64(d.Amt),
})
}
// Next, we'll convert the change addr to a pkScript that we can use
// to create the sweep transaction.
deliveryPkScript, err := txscript.PayToAddrScript(deliveryAddr)
changePkScript, err := txscript.PayToAddrScript(changeAddr)
if err != nil {
unlockOutputs()
@@ -273,7 +300,7 @@ func CraftSweepAllTx(feeRate chainfee.SatPerKWeight, dustLimit btcutil.Amount,
// Finally, we'll ask the sweeper to craft a sweep transaction which
// respects our fee preference and targets all the UTXOs of the wallet.
sweepTx, err := createSweepTx(
inputsToSweep, deliveryPkScript, blockHeight, feeRate,
inputsToSweep, txOuts, changePkScript, blockHeight, feeRate,
dustLimit, signer,
)
if err != nil {