CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool)
{
if (answerFoundAtTarget)
*answerFoundAtTarget = confTarget;
// Return failure if trying to analyze a target we're not tracking
if (confTarget <= 0 || (unsigned int)confTarget > feeStats.GetMaxConfirms())
return CFeeRate(0);
double median = -1;
while (median < 0 && (unsigned int)confTarget <= feeStats.GetMaxConfirms()) {
median = feeStats.EstimateMedianVal(confTarget++, SUFFICIENT_FEETXS, MIN_SUCCESS_PCT, true, nBestSeenHeight);
}
if (answerFoundAtTarget)
*answerFoundAtTarget = confTarget - 1;
// If mempool is limiting txs , return at least the min fee from the mempool
CAmount minPoolFee = pool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
if (minPoolFee > 0 && minPoolFee > median)
return CFeeRate(minPoolFee);
if (median < 0)
return CFeeRate(0);
return CFeeRate(median);
}
CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc)
{
/* User control of how to calculate fee uses the following parameter precedence:
1. coin_control.m_feerate
2. coin_control.m_confirm_target
3. payTxFee (user-set global variable)
4. nTxConfirmTarget (user-set global variable)
The first parameter that is set is used.
*/
CAmount fee_needed;
if (coin_control.m_feerate) { // 1.
fee_needed = coin_control.m_feerate->GetFee(nTxBytes);
if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
// Allow to override automatic min/max check over coin control instance
if (coin_control.fOverrideFeeRate) return fee_needed;
}
else if (!coin_control.m_confirm_target && ::payTxFee != CFeeRate(0)) { // 3. TODO: remove magic value of 0 for global payTxFee
fee_needed = ::payTxFee.GetFee(nTxBytes);
if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
}
else { // 2. or 4.
// We will use smart fee estimation
unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : ::nTxConfirmTarget;
// By default estimates are economical iff we are signaling opt-in-RBF
bool conservative_estimate = !coin_control.signalRbf;
// Allow to override the default fee estimate mode over the CoinControl instance
if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE) conservative_estimate = true;
else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL) conservative_estimate = false;
fee_needed = estimator.estimateSmartFee(target, feeCalc, conservative_estimate).GetFee(nTxBytes);
if (fee_needed == 0) {
// if we don't have enough data for estimateSmartFee, then use fallbackFee
fee_needed = CWallet::fallbackFee.GetFee(nTxBytes);
if (feeCalc) feeCalc->reason = FeeReason::FALLBACK;
}
// Obey mempool min fee when using smart fee estimation
CAmount min_mempool_fee = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nTxBytes);
if (fee_needed < min_mempool_fee) {
fee_needed = min_mempool_fee;
if (feeCalc) feeCalc->reason = FeeReason::MEMPOOL_MIN;
}
}
// prevent user from paying a fee below minRelayTxFee or minTxFee
CAmount required_fee = GetRequiredFee(nTxBytes);
if (required_fee > fee_needed) {
fee_needed = required_fee;
if (feeCalc) feeCalc->reason = FeeReason::REQUIRED;
}
// But always obey the maximum
if (fee_needed > maxTxFee) {
fee_needed = maxTxFee;
if (feeCalc) feeCalc->reason = FeeReason::MAXTXFEE;
}
return fee_needed;
}
double CBlockPolicyEstimator::estimateSmartPriority(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool)
{
if (answerFoundAtTarget)
*answerFoundAtTarget = confTarget;
// If mempool is limiting txs, no priority txs are allowed
CAmount minPoolFee = pool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
if (minPoolFee > 0)
return INF_PRIORITY;
return -1;
}
double CBlockPolicyEstimator::estimateSmartPriority(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool)
{
if (answerFoundAtTarget)
*answerFoundAtTarget = confTarget;
// Return failure if trying to analyze a target we're not tracking
if (confTarget <= 0 || (unsigned int)confTarget > priStats.GetMaxConfirms())
return -1;
// If mempool is limiting txs, no priority txs are allowed
CAmount minPoolFee = pool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
if (minPoolFee > 0)
return INF_PRIORITY;
double median = -1;
while (median < 0 && (unsigned int)confTarget <= priStats.GetMaxConfirms()) {
median = priStats.EstimateMedianVal(confTarget++, SUFFICIENT_PRITXS, MIN_SUCCESS_PCT, true, nBestSeenHeight);
}
if (answerFoundAtTarget)
*answerFoundAtTarget = confTarget - 1;
return median;
}
CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool& pool) const
{
if (answerFoundAtTarget)
*answerFoundAtTarget = confTarget;
double median = -1;
{
LOCK(cs_feeEstimator);
// Return failure if trying to analyze a target we're not tracking
if (confTarget <= 0 || (unsigned int)confTarget > feeStats->GetMaxConfirms())
return CFeeRate(0);
// It's not possible to get reasonable estimates for confTarget of 1
if (confTarget == 1)
confTarget = 2;
while (median < 0 && (unsigned int)confTarget <= feeStats->GetMaxConfirms()) {
median = feeStats->EstimateMedianVal(confTarget++, SUFFICIENT_FEETXS, MIN_SUCCESS_PCT, true, nBestSeenHeight);
}
} // Must unlock cs_feeEstimator before taking mempool locks
if (answerFoundAtTarget)
*answerFoundAtTarget = confTarget - 1;
// If mempool is limiting txs , return at least the min feerate from the mempool
CAmount minPoolFee = pool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
if (minPoolFee > 0 && minPoolFee > median)
return CFeeRate(minPoolFee);
if (median < 0)
return CFeeRate(0);
return CFeeRate(median);
}
