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sweep: make sweeper aware of unconfirmed parent transactions.

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Extend the fee estimator to take into account parent transactions with
their weights and fees.

Do not try to cpfp parent transactions that have a higher fee rate than
the sweep tx fee rate.
This commit is contained in:
Joost Jager
2020-09-04 11:28:17 +02:00
parent 3e3d8487fb
commit 681496b474
13 changed files with 334 additions and 30 deletions
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22
sweep/txgenerator.go
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@@ -134,9 +134,9 @@ func createSweepTx(inputs []input.Input, outputPkScript []byte,
currentBlockHeight uint32, feePerKw chainfee.SatPerKWeight,
signer input.Signer) (*wire.MsgTx, error) {
inputs, txWeight := getWeightEstimate(inputs)
inputs, estimator := getWeightEstimate(inputs, feePerKw)
txFee := feePerKw.FeeForWeight(txWeight)
txFee := estimator.fee()
// Sum up the total value contained in the inputs.
var totalSum btcutil.Amount
@@ -208,21 +208,29 @@ func createSweepTx(inputs []input.Input, outputPkScript []byte,
}
log.Infof("Creating sweep transaction %v for %v inputs (%s) "+
"using %v sat/kw, tx_fee=%v", sweepTx.TxHash(), len(inputs),
inputTypeSummary(inputs), int64(feePerKw), txFee)
"using %v sat/kw, tx_weight=%v, tx_fee=%v, parents_count=%v, "+
"parents_fee=%v, parents_weight=%v",
sweepTx.TxHash(), len(inputs),
inputTypeSummary(inputs), int64(feePerKw),
estimator.weight(), txFee,
len(estimator.parents), estimator.parentsFee,
estimator.parentsWeight,
)
return sweepTx, nil
}
// getWeightEstimate returns a weight estimate for the given inputs.
// Additionally, it returns counts for the number of csv and cltv inputs.
func getWeightEstimate(inputs []input.Input) ([]input.Input, int64) {
func getWeightEstimate(inputs []input.Input, feeRate chainfee.SatPerKWeight) (
[]input.Input, *weightEstimator) {
// We initialize a weight estimator so we can accurately asses the
// amount of fees we need to pay for this sweep transaction.
//
// TODO(roasbeef): can be more intelligent about buffering outputs to
// be more efficient on-chain.
weightEstimate := newWeightEstimator()
weightEstimate := newWeightEstimator(feeRate)
// Our sweep transaction will pay to a single segwit p2wkh address,
// ensure it contributes to our weight estimate.
@@ -247,7 +255,7 @@ func getWeightEstimate(inputs []input.Input) ([]input.Input, int64) {
sweepInputs = append(sweepInputs, inp)
}
return sweepInputs, int64(weightEstimate.weight())
return sweepInputs, weightEstimate
}
// inputSummary returns a string containing a human readable summary about the