diff --git a/src/init.cpp b/src/init.cpp index 9ac69b7d3..07af9acc8 100644 --- a/src/init.cpp +++ b/src/init.cpp @@ -467,8 +467,11 @@ std::string HelpMessage(HelpMessageMode mode) AppendParamsHelpMessages(strUsage, showDebug); strUsage += HelpMessageGroup(_("Node relay options:")); - if (showDebug) + if (showDebug) { strUsage += HelpMessageOpt("-acceptnonstdtxn", strprintf("Relay and mine \"non-standard\" transactions (%sdefault: %u)", "testnet/regtest only; ", !Params(CBaseChainParams::TESTNET).RequireStandard())); + strUsage += HelpMessageOpt("-incrementalrelayfee=", strprintf("Fee rate (in %s/kB) used to define cost of relay, used for mempool limiting and BIP 125 replacement. (default: %s)", CURRENCY_UNIT, FormatMoney(DEFAULT_INCREMENTAL_RELAY_FEE))); + strUsage += HelpMessageOpt("-dustrelayfee=", strprintf("Fee rate (in %s/kB) used to defined dust, the value of an output such that it will cost about 1/3 of its value in fees at this fee rate to spend it. (default: %s)", CURRENCY_UNIT, FormatMoney(DUST_RELAY_TX_FEE))); + } strUsage += HelpMessageOpt("-bytespersigop", strprintf(_("Equivalent bytes per sigop in transactions for relay and mining (default: %u)"), DEFAULT_BYTES_PER_SIGOP)); strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), DEFAULT_ACCEPT_DATACARRIER)); strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY)); @@ -478,6 +481,7 @@ std::string HelpMessage(HelpMessageMode mode) strUsage += HelpMessageOpt("-blockmaxweight=", strprintf(_("Set maximum BIP141 block weight (default: %d)"), DEFAULT_BLOCK_MAX_WEIGHT)); strUsage += HelpMessageOpt("-blockmaxsize=", strprintf(_("Set maximum block size in bytes (default: %d)"), DEFAULT_BLOCK_MAX_SIZE)); strUsage += HelpMessageOpt("-blockprioritysize=", strprintf(_("Set maximum size of high-priority/low-fee transactions in bytes (default: %d)"), DEFAULT_BLOCK_PRIORITY_SIZE)); + strUsage += HelpMessageOpt("-blockmintxfee=", strprintf(_("Set lowest fee rate (in %s/kB) for transactions to be included in block creation. (default: %s)"), CURRENCY_UNIT, FormatMoney(DEFAULT_BLOCK_MIN_TX_FEE))); if (showDebug) strUsage += HelpMessageOpt("-blockversion=", "Override block version to test forking scenarios"); @@ -925,6 +929,15 @@ bool AppInitParameterInteraction() int64_t nMempoolSizeMin = GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000 * 40; if (nMempoolSizeMax < 0 || nMempoolSizeMax < nMempoolSizeMin) return InitError(strprintf(_("-maxmempool must be at least %d MB"), std::ceil(nMempoolSizeMin / 1000000.0))); + // incremental relay fee sets the minimimum feerate increase necessary for BIP 125 replacement in the mempool + // and the amount the mempool min fee increases above the feerate of txs evicted due to mempool limiting. + if (IsArgSet("-incrementalrelayfee")) + { + CAmount n = 0; + if (!ParseMoney(GetArg("-incrementalrelayfee", ""), n)) + return InitError(AmountErrMsg("incrementalrelayfee", GetArg("-incrementalrelayfee", ""))); + incrementalRelayFee = CFeeRate(n); + } // -par=0 means autodetect, but nScriptCheckThreads==0 means no concurrency nScriptCheckThreads = GetArg("-par", DEFAULT_SCRIPTCHECK_THREADS); @@ -975,6 +988,29 @@ bool AppInitParameterInteraction() return InitError(AmountErrMsg("minrelaytxfee", GetArg("-minrelaytxfee", ""))); // High fee check is done afterward in CWallet::ParameterInteraction() ::minRelayTxFee = CFeeRate(n); + } else if (incrementalRelayFee > ::minRelayTxFee) { + // Allow only setting incrementalRelayFee to control both + ::minRelayTxFee = incrementalRelayFee; + LogPrintf("Increasing minrelaytxfee to %s to match incrementalrelayfee\n",::minRelayTxFee.ToString()); + } + + // Sanity check argument for min fee for including tx in block + // TODO: Harmonize which arguments need sanity checking and where that happens + if (IsArgSet("-blockmintxfee")) + { + CAmount n = 0; + if (!ParseMoney(GetArg("-blockmintxfee", ""), n)) + return InitError(AmountErrMsg("blockmintxfee", GetArg("-blockmintxfee", ""))); + } + + // Feerate used to define dust. Shouldn't be changed lightly as old + // implementations may inadvertently create non-standard transactions + if (IsArgSet("-dustrelayfee")) + { + CAmount n = 0; + if (!ParseMoney(GetArg("-dustrelayfee", ""), n) || 0 == n) + return InitError(AmountErrMsg("dustrelayfee", GetArg("-dustrelayfee", ""))); + dustRelayFee = CFeeRate(n); } fRequireStandard = !GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard()); diff --git a/src/miner.cpp b/src/miner.cpp index 856e9edc1..acded9416 100644 --- a/src/miner.cpp +++ b/src/miner.cpp @@ -95,12 +95,18 @@ BlockAssembler::BlockAssembler(const CChainParams& _chainparams) nBlockMaxWeight = nBlockMaxSize * WITNESS_SCALE_FACTOR; } } + if (IsArgSet("-blockmintxfee")) { + CAmount n = 0; + ParseMoney(GetArg("-blockmintxfee", ""), n); + blockMinFeeRate = CFeeRate(n); + } else { + blockMinFeeRate = CFeeRate(DEFAULT_BLOCK_MIN_TX_FEE); + } // Limit weight to between 4K and MAX_BLOCK_WEIGHT-4K for sanity: nBlockMaxWeight = std::max((unsigned int)4000, std::min((unsigned int)(MAX_BLOCK_WEIGHT-4000), nBlockMaxWeight)); // Limit size to between 1K and MAX_BLOCK_SERIALIZED_SIZE-1K for sanity: nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SERIALIZED_SIZE-1000), nBlockMaxSize)); - // Whether we need to account for byte usage (in addition to weight usage) fNeedSizeAccounting = (nBlockMaxSize < MAX_BLOCK_SERIALIZED_SIZE-1000); } @@ -460,7 +466,7 @@ void BlockAssembler::addPackageTxs() packageSigOpsCost = modit->nSigOpCostWithAncestors; } - if (packageFees < ::minRelayTxFee.GetFee(packageSize)) { + if (packageFees < blockMinFeeRate.GetFee(packageSize)) { // Everything else we might consider has a lower fee rate return; } diff --git a/src/miner.h b/src/miner.h index 3dd9bf4ca..3ba92b16b 100644 --- a/src/miner.h +++ b/src/miner.h @@ -143,6 +143,7 @@ private: bool fIncludeWitness; unsigned int nBlockMaxWeight, nBlockMaxSize; bool fNeedSizeAccounting; + CFeeRate blockMinFeeRate; // Information on the current status of the block uint64_t nBlockWeight; diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp index d318a0997..ec398f662 100644 --- a/src/policy/policy.cpp +++ b/src/policy/policy.cpp @@ -105,7 +105,7 @@ bool IsStandardTx(const CTransaction& tx, std::string& reason, const bool witnes else if ((whichType == TX_MULTISIG) && (!fIsBareMultisigStd)) { reason = "bare-multisig"; return false; - } else if (txout.IsDust(::minRelayTxFee)) { + } else if (txout.IsDust(dustRelayFee)) { reason = "dust"; return false; } @@ -206,6 +206,8 @@ bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs) return true; } +CFeeRate incrementalRelayFee = CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE); +CFeeRate dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE); unsigned int nBytesPerSigOp = DEFAULT_BYTES_PER_SIGOP; int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost) diff --git a/src/policy/policy.h b/src/policy/policy.h index 764ee2780..9b1323ac2 100644 --- a/src/policy/policy.h +++ b/src/policy/policy.h @@ -20,6 +20,8 @@ static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 750000; static const unsigned int DEFAULT_BLOCK_PRIORITY_SIZE = 0; /** Default for -blockmaxweight, which controls the range of block weights the mining code will create **/ static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = 3000000; +/** Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code **/ +static const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 1000; /** The maximum weight for transactions we're willing to relay/mine */ static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000; /** Maximum number of signature check operations in an IsStandard() P2SH script */ @@ -28,6 +30,8 @@ static const unsigned int MAX_P2SH_SIGOPS = 15; static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5; /** Default for -maxmempool, maximum megabytes of mempool memory usage */ static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300; +/** Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement **/ +static const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 1000; /** Default for -bytespersigop */ static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20; /** The maximum number of witness stack items in a standard P2WSH script */ @@ -36,6 +40,12 @@ static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS = 100; static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE = 80; /** The maximum size of a standard witnessScript */ static const unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE = 3600; +/** Min feerate for defining dust. Historically this has been the same as the + * minRelayTxFee, however changing the dust limit changes which transactions are + * standard and should be done with care and ideally rarely. It makes sense to + * only increase the dust limit after prior releases were already not creating + * outputs below the new threshold */ +static const unsigned int DUST_RELAY_TX_FEE = 1000; /** * Standard script verification flags that standard transactions will comply * with. However scripts violating these flags may still be present in valid @@ -83,6 +93,8 @@ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs) */ bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs); +extern CFeeRate incrementalRelayFee; +extern CFeeRate dustRelayFee; extern unsigned int nBytesPerSigOp; /** Compute the virtual transaction size (weight reinterpreted as bytes). */ diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp index a0c281347..f8aba70d9 100644 --- a/src/qt/coincontroldialog.cpp +++ b/src/qt/coincontroldialog.cpp @@ -15,7 +15,8 @@ #include "wallet/coincontrol.h" #include "init.h" -#include "validation.h" // For minRelayTxFee +#include "policy/policy.h" +#include "validation.h" // For mempool #include "wallet/wallet.h" #include // for 'map_list_of()' @@ -432,7 +433,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog) { CTxOut txout(amount, (CScript)std::vector(24, 0)); txDummy.vout.push_back(txout); - if (txout.IsDust(::minRelayTxFee)) + if (txout.IsDust(dustRelayFee)) fDust = true; } } @@ -545,10 +546,10 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog) if (nChange > 0 && nChange < MIN_CHANGE) { CTxOut txout(nChange, (CScript)std::vector(24, 0)); - if (txout.IsDust(::minRelayTxFee)) + if (txout.IsDust(dustRelayFee)) { if (CoinControlDialog::fSubtractFeeFromAmount) // dust-change will be raised until no dust - nChange = txout.GetDustThreshold(::minRelayTxFee); + nChange = txout.GetDustThreshold(dustRelayFee); else { nPayFee += nChange; diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp index bc865c992..ea80a1f54 100644 --- a/src/qt/guiutil.cpp +++ b/src/qt/guiutil.cpp @@ -11,7 +11,7 @@ #include "primitives/transaction.h" #include "init.h" -#include "validation.h" // For minRelayTxFee +#include "policy/policy.h" #include "protocol.h" #include "script/script.h" #include "script/standard.h" @@ -257,7 +257,7 @@ bool isDust(const QString& address, const CAmount& amount) CTxDestination dest = CBitcoinAddress(address.toStdString()).Get(); CScript script = GetScriptForDestination(dest); CTxOut txOut(amount, script); - return txOut.IsDust(::minRelayTxFee); + return txOut.IsDust(dustRelayFee); } QString HtmlEscape(const QString& str, bool fMultiLine) diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp index 6b2871424..688e8123a 100644 --- a/src/qt/paymentserver.cpp +++ b/src/qt/paymentserver.cpp @@ -10,7 +10,7 @@ #include "base58.h" #include "chainparams.h" -#include "validation.h" // For minRelayTxFee +#include "policy/policy.h" #include "ui_interface.h" #include "util.h" #include "wallet/wallet.h" @@ -582,7 +582,7 @@ bool PaymentServer::processPaymentRequest(const PaymentRequestPlus& request, Sen // Extract and check amounts CTxOut txOut(sendingTo.second, sendingTo.first); - if (txOut.IsDust(::minRelayTxFee)) { + if (txOut.IsDust(dustRelayFee)) { Q_EMIT message(tr("Payment request error"), tr("Requested payment amount of %1 is too small (considered dust).") .arg(BitcoinUnits::formatWithUnit(optionsModel->getDisplayUnit(), sendingTo.second)), CClientUIInterface::MSG_ERROR); diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp index 8c9aaef02..374423179 100644 --- a/src/test/transaction_tests.cpp +++ b/src/test/transaction_tests.cpp @@ -690,7 +690,7 @@ BOOST_AUTO_TEST_CASE(test_IsStandard) BOOST_CHECK(IsStandardTx(t, reason)); // Check dust with default relay fee: - CAmount nDustThreshold = 182 * minRelayTxFee.GetFeePerK()/1000 * 3; + CAmount nDustThreshold = 182 * dustRelayFee.GetFeePerK()/1000 * 3; BOOST_CHECK_EQUAL(nDustThreshold, 546); // dust: t.vout[0].nValue = nDustThreshold - 1; @@ -701,14 +701,14 @@ BOOST_AUTO_TEST_CASE(test_IsStandard) // Check dust with odd relay fee to verify rounding: // nDustThreshold = 182 * 1234 / 1000 * 3 - minRelayTxFee = CFeeRate(1234); + dustRelayFee = CFeeRate(1234); // dust: t.vout[0].nValue = 672 - 1; BOOST_CHECK(!IsStandardTx(t, reason)); // not dust: t.vout[0].nValue = 672; BOOST_CHECK(IsStandardTx(t, reason)); - minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE); + dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE); t.vout[0].scriptPubKey = CScript() << OP_1; BOOST_CHECK(!IsStandardTx(t, reason)); diff --git a/src/txmempool.cpp b/src/txmempool.cpp index 373687430..5b085f492 100644 --- a/src/txmempool.cpp +++ b/src/txmempool.cpp @@ -359,7 +359,6 @@ CTxMemPool::CTxMemPool(const CFeeRate& _minReasonableRelayFee) : nCheckFrequency = 0; minerPolicyEstimator = new CBlockPolicyEstimator(_minReasonableRelayFee); - minReasonableRelayFee = _minReasonableRelayFee; } CTxMemPool::~CTxMemPool() @@ -1076,12 +1075,12 @@ CFeeRate CTxMemPool::GetMinFee(size_t sizelimit) const { rollingMinimumFeeRate = rollingMinimumFeeRate / pow(2.0, (time - lastRollingFeeUpdate) / halflife); lastRollingFeeUpdate = time; - if (rollingMinimumFeeRate < (double)minReasonableRelayFee.GetFeePerK() / 2) { + if (rollingMinimumFeeRate < (double)incrementalRelayFee.GetFeePerK() / 2) { rollingMinimumFeeRate = 0; return CFeeRate(0); } } - return std::max(CFeeRate(rollingMinimumFeeRate), minReasonableRelayFee); + return std::max(CFeeRate(rollingMinimumFeeRate), incrementalRelayFee); } void CTxMemPool::trackPackageRemoved(const CFeeRate& rate) { @@ -1105,7 +1104,7 @@ void CTxMemPool::TrimToSize(size_t sizelimit, std::vector* pvNoSpendsRe // to have 0 fee). This way, we don't allow txn to enter mempool with feerate // equal to txn which were removed with no block in between. CFeeRate removed(it->GetModFeesWithDescendants(), it->GetSizeWithDescendants()); - removed += minReasonableRelayFee; + removed += incrementalRelayFee; trackPackageRemoved(removed); maxFeeRateRemoved = std::max(maxFeeRateRemoved, removed); diff --git a/src/txmempool.h b/src/txmempool.h index 6a00b540a..ffb1c1309 100644 --- a/src/txmempool.h +++ b/src/txmempool.h @@ -423,8 +423,6 @@ private: uint64_t totalTxSize; //!< sum of all mempool tx's virtual sizes. Differs from serialized tx size since witness data is discounted. Defined in BIP 141. uint64_t cachedInnerUsage; //!< sum of dynamic memory usage of all the map elements (NOT the maps themselves) - CFeeRate minReasonableRelayFee; - mutable int64_t lastRollingFeeUpdate; mutable bool blockSinceLastRollingFeeBump; mutable double rollingMinimumFeeRate; //!< minimum fee to get into the pool, decreases exponentially @@ -503,9 +501,6 @@ public: std::map > mapDeltas; /** Create a new CTxMemPool. - * minReasonableRelayFee should be a feerate which is, roughly, somewhere - * around what it "costs" to relay a transaction around the network and - * below which we would reasonably say a transaction has 0-effective-fee. */ CTxMemPool(const CFeeRate& _minReasonableRelayFee); ~CTxMemPool(); @@ -588,7 +583,7 @@ public: /** The minimum fee to get into the mempool, which may itself not be enough * for larger-sized transactions. - * The minReasonableRelayFee constructor arg is used to bound the time it + * The incrementalRelayFee policy variable is used to bound the time it * takes the fee rate to go back down all the way to 0. When the feerate * would otherwise be half of this, it is set to 0 instead. */ diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp index ccda4a7c7..b4ea77a8f 100644 --- a/src/wallet/wallet.cpp +++ b/src/wallet/wallet.cpp @@ -2341,7 +2341,7 @@ bool CWallet::CreateTransaction(const vector& vecSend, CWalletTx& wt } } - if (txout.IsDust(::minRelayTxFee)) + if (txout.IsDust(dustRelayFee)) { if (recipient.fSubtractFeeFromAmount && nFeeRet > 0) { @@ -2419,16 +2419,16 @@ bool CWallet::CreateTransaction(const vector& vecSend, CWalletTx& wt // We do not move dust-change to fees, because the sender would end up paying more than requested. // This would be against the purpose of the all-inclusive feature. // So instead we raise the change and deduct from the recipient. - if (nSubtractFeeFromAmount > 0 && newTxOut.IsDust(::minRelayTxFee)) + if (nSubtractFeeFromAmount > 0 && newTxOut.IsDust(dustRelayFee)) { - CAmount nDust = newTxOut.GetDustThreshold(::minRelayTxFee) - newTxOut.nValue; + CAmount nDust = newTxOut.GetDustThreshold(dustRelayFee) - newTxOut.nValue; newTxOut.nValue += nDust; // raise change until no more dust for (unsigned int i = 0; i < vecSend.size(); i++) // subtract from first recipient { if (vecSend[i].fSubtractFeeFromAmount) { txNew.vout[i].nValue -= nDust; - if (txNew.vout[i].IsDust(::minRelayTxFee)) + if (txNew.vout[i].IsDust(dustRelayFee)) { strFailReason = _("The transaction amount is too small to send after the fee has been deducted"); return false; @@ -2440,7 +2440,7 @@ bool CWallet::CreateTransaction(const vector& vecSend, CWalletTx& wt // Never create dust outputs; if we would, just // add the dust to the fee. - if (newTxOut.IsDust(::minRelayTxFee)) + if (newTxOut.IsDust(dustRelayFee)) { nChangePosInOut = -1; nFeeRet += nChange;