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Merge #11145: Fix rounding bug in calculation of minimum change

6af49dd Output a bit more information for fee calculation report. (Alex Morcos)
a54c7b9 Fix rounding errors in calculation of minimum change size (Alex Morcos)

Pull request description:

  Thanks to @juscamarena for reporting this.

  Please backport to 0.15.

  There was a potential rounding error where the fee for the change added to the fee for the original tx could be less than the fee for the tx including change.

  This is fixed in the first commit.  The second commit adds one more snippet of information in the fee calculation report.  I actually realized that there is more information that would be nice to report, but we can add that post 0.15.

  An open question is whether we should be returning failure if the test in line 2885 is hit or just resetting pick_new_inputs and continuing.  Originally I made it a failure to avoid any possible infinite loops.  But the case hit here is an example of where that logic possibly backfired.

Tree-SHA512: efe049781acc1f6a8ad429a689359ac6f7b7c44cdfc9578a866dff4a2f6596e8de474a89d25c704f31ef4f8c89af770e98b75ef06c25419d5a6dfc87247bf274
0.16
Wladimir J. van der Laan 7 years ago
parent
commit
9c833f471c
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GPG Key ID: 1E4AED62986CD25D
  1. 17
      src/wallet/wallet.cpp

17
src/wallet/wallet.cpp

@ -2612,6 +2612,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT @@ -2612,6 +2612,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
assert(txNew.nLockTime <= (unsigned int)chainActive.Height());
assert(txNew.nLockTime < LOCKTIME_THRESHOLD);
FeeCalculation feeCalc;
CAmount nFeeNeeded;
unsigned int nBytes;
{
std::set<CInputCoin> setCoins;
@ -2773,7 +2774,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT @@ -2773,7 +2774,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
vin.scriptWitness.SetNull();
}
CAmount nFeeNeeded = GetMinimumFee(nBytes, coin_control, ::mempool, ::feeEstimator, &feeCalc);
nFeeNeeded = GetMinimumFee(nBytes, coin_control, ::mempool, ::feeEstimator, &feeCalc);
// If we made it here and we aren't even able to meet the relay fee on the next pass, give up
// because we must be at the maximum allowed fee.
@ -2794,14 +2795,16 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT @@ -2794,14 +2795,16 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
// new inputs. We now know we only need the smaller fee
// (because of reduced tx size) and so we should add a
// change output. Only try this once.
CAmount fee_needed_for_change = GetMinimumFee(change_prototype_size, coin_control, ::mempool, ::feeEstimator, nullptr);
if (nChangePosInOut == -1 && nSubtractFeeFromAmount == 0 && pick_new_inputs) {
unsigned int tx_size_with_change = nBytes + change_prototype_size + 2; // Add 2 as a buffer in case increasing # of outputs changes compact size
CAmount fee_needed_with_change = GetMinimumFee(tx_size_with_change, coin_control, ::mempool, ::feeEstimator, nullptr);
CAmount minimum_value_for_change = GetDustThreshold(change_prototype_txout, discard_rate);
CAmount max_excess_fee = fee_needed_for_change + minimum_value_for_change;
if (nFeeRet > nFeeNeeded + max_excess_fee && nChangePosInOut == -1 && nSubtractFeeFromAmount == 0 && pick_new_inputs) {
if (nFeeRet >= fee_needed_with_change + minimum_value_for_change) {
pick_new_inputs = false;
nFeeRet = nFeeNeeded + fee_needed_for_change;
nFeeRet = fee_needed_with_change;
continue;
}
}
// If we have change output already, just increase it
if (nFeeRet > nFeeNeeded && nChangePosInOut != -1 && nSubtractFeeFromAmount == 0) {
@ -2895,8 +2898,8 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT @@ -2895,8 +2898,8 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
}
}
LogPrintf("Fee Calculation: Fee:%d Bytes:%u Tgt:%d (requested %d) Reason:\"%s\" Decay %.5f: Estimation: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out) Fail: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out)\n",
nFeeRet, nBytes, feeCalc.returnedTarget, feeCalc.desiredTarget, StringForFeeReason(feeCalc.reason), feeCalc.est.decay,
LogPrintf("Fee Calculation: Fee:%d Bytes:%u Needed:%d Tgt:%d (requested %d) Reason:\"%s\" Decay %.5f: Estimation: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out) Fail: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out)\n",
nFeeRet, nBytes, nFeeNeeded, feeCalc.returnedTarget, feeCalc.desiredTarget, StringForFeeReason(feeCalc.reason), feeCalc.est.decay,
feeCalc.est.pass.start, feeCalc.est.pass.end,
100 * feeCalc.est.pass.withinTarget / (feeCalc.est.pass.totalConfirmed + feeCalc.est.pass.inMempool + feeCalc.est.pass.leftMempool),
feeCalc.est.pass.withinTarget, feeCalc.est.pass.totalConfirmed, feeCalc.est.pass.inMempool, feeCalc.est.pass.leftMempool,

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