merge bitcoin#15778: Move maxtxfee from node to wallet

src/coinjoin/coinjoin.cpp

@@ -22,6 +22,8 @@
 
 #include <string>
 
+constexpr static CAmount DEFAULT_MAX_RAW_TX_FEE{COIN / 10};
+
 bool CCoinJoinEntry::AddScriptSig(const CTxIn& txin)
 {
     for (auto& txdsin : vecTxDSIn) {
@@ -370,7 +372,7 @@ bool CCoinJoin::IsCollateralValid(const CTransaction& txCollateral)
     {
         LOCK(cs_main);
         CValidationState validationState;
-        if (!AcceptToMemoryPool(mempool, validationState, MakeTransactionRef(txCollateral), nullptr /* pfMissingInputs */, false /* bypass_limits */, maxTxFee /* nAbsurdFee */, true /* fDryRun */)) {
+        if (!AcceptToMemoryPool(mempool, validationState, MakeTransactionRef(txCollateral), nullptr /* pfMissingInputs */, false /* bypass_limits */, DEFAULT_MAX_RAW_TX_FEE /* nAbsurdFee */, true /* fDryRun */)) {
             LogPrint(BCLog::COINJOIN, "CCoinJoin::IsCollateralValid -- didn't pass AcceptToMemoryPool()\n");
             return false;
         }

src/coinjoin/server.cpp

@@ -23,6 +23,7 @@
 #include <univalue.h>
 
 CCoinJoinServer coinJoinServer;
+constexpr static CAmount DEFAULT_MAX_RAW_TX_FEE{COIN / 10};
 
 void CCoinJoinServer::ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStream& vRecv, CConnman& connman, bool enable_bip61)
 {
@@ -341,7 +342,7 @@ void CCoinJoinServer::CommitFinalTransaction(CConnman& connman)
         TRY_LOCK(cs_main, lockMain);
         CValidationState validationState;
         mempool.PrioritiseTransaction(hashTx, 0.1 * COIN);
-        if (!lockMain || !AcceptToMemoryPool(mempool, validationState, finalTransaction, nullptr /* pfMissingInputs */, false /* bypass_limits */, maxTxFee /* nAbsurdFee */)) {
+        if (!lockMain || !AcceptToMemoryPool(mempool, validationState, finalTransaction, nullptr /* pfMissingInputs */, false /* bypass_limits */, DEFAULT_MAX_RAW_TX_FEE /* nAbsurdFee */)) {
             LogPrint(BCLog::COINJOIN, "CCoinJoinServer::CommitFinalTransaction -- AcceptToMemoryPool() error: Transaction not valid\n");
             SetNull();
             // not much we can do in this case, just notify clients

src/coinjoin/util.cpp

@@ -236,8 +236,8 @@ CAmount CTransactionBuilder::GetFee(unsigned int nBytes) const
     if (nRequiredFee > nFeeCalc) {
         nFeeCalc = nRequiredFee;
     }
-    if (nFeeCalc > ::maxTxFee) {
+    if (nFeeCalc > pwallet->m_default_max_tx_fee) {
-        nFeeCalc = ::maxTxFee;
+        nFeeCalc = pwallet->m_default_max_tx_fee;
     }
     return nFeeCalc;
 }

src/dummywallet.cpp

@@ -37,6 +37,7 @@ void DummyWalletInit::AddWalletOptions() const
         "-disablewallet",
         "-instantsendnotify=<cmd>",
         "-keypool=<n>",
+        "-maxtxfee=<amt>",
         "-rescan=<mode>",
         "-salvagewallet",
         "-spendzeroconfchange",

src/init.cpp

@@ -685,8 +685,6 @@ void SetupServerArgs()
     gArgs.AddArg("-maxsigcachesize=<n>", strprintf("Limit sum of signature cache and script execution cache sizes to <n> MiB (default: %u)", DEFAULT_MAX_SIG_CACHE_SIZE), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-maxtipage=<n>", strprintf("Maximum tip age in seconds to consider node in initial block download (default: %u)", DEFAULT_MAX_TIP_AGE), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-mocktime=<n>", "Replace actual time with <n> seconds since epoch (default: 0)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
-    gArgs.AddArg("-maxtxfee=<amt>", strprintf("Maximum total fees (in %s) to use in a single wallet transaction; setting this too low may abort large transactions (default: %s)",
-        CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)), ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST); // TODO move setting to wallet
     gArgs.AddArg("-minsporkkeys=<n>", "Overrides minimum spork signers to change spork value. Only useful for regtest and devnet. Using this on mainnet or testnet will ban you.", ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-printpriority", strprintf("Log transaction fee per kB when mining blocks (default: %u)", DEFAULT_PRINTPRIORITY), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-printtoconsole", "Send trace/debug info to console (default: 1 when no -daemon. To disable logging to file, set -nodebuglogfile)", ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
@@ -1496,22 +1494,6 @@ bool AppInitParameterInteraction()
         dustRelayFee = CFeeRate(n);
     }
 
-    // This is required by both the wallet and node
-    if (gArgs.IsArgSet("-maxtxfee"))
-    {
-        CAmount nMaxFee = 0;
-        if (!ParseMoney(gArgs.GetArg("-maxtxfee", ""), nMaxFee))
-            return InitError(AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", "")));
-        if (nMaxFee > HIGH_MAX_TX_FEE)
-            InitWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction."));
-        maxTxFee = nMaxFee;
-        if (CFeeRate(maxTxFee, 1000) < ::minRelayTxFee)
-        {
-            return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
-                                       gArgs.GetArg("-maxtxfee", ""), ::minRelayTxFee.ToString()));
-        }
-    }
-
     fRequireStandard = !gArgs.GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
     if (chainparams.RequireStandard() && !fRequireStandard)
         return InitError(strprintf("acceptnonstdtxn is not currently supported for %s chain", chainparams.NetworkIDString()));

src/interfaces/chain.cpp

@@ -356,7 +356,6 @@ public:
     CFeeRate relayMinFee() override { return ::minRelayTxFee; }
     CFeeRate relayIncrementalFee() override { return ::incrementalRelayFee; }
     CFeeRate relayDustFee() override { return ::dustRelayFee; }
-    CAmount maxTxFee() override { return ::maxTxFee; }
     bool getPruneMode() override { return ::fPruneMode; }
     bool p2pEnabled() override { return g_connman != nullptr; }
     bool isReadyToBroadcast() override { return !::fImporting && !::fReindex && !::ChainstateActive().IsInitialBlockDownload(); }

src/interfaces/chain.h

@@ -211,12 +211,6 @@ public:
     //! Relay dust fee setting (-dustrelayfee), reflecting lowest rate it's economical to spend.
     virtual CFeeRate relayDustFee() = 0;
 
-    //! Node max tx fee setting (-maxtxfee).
-    //! This could be replaced by a per-wallet max fee, as proposed at
-    //! https://github.com/bitcoin/bitcoin/issues/15355
-    //! But for the time being, wallets call this to access the node setting.
-    virtual CAmount maxTxFee() = 0;
-
     //! Check if pruning is enabled.
     virtual bool getPruneMode() = 0;
 

src/interfaces/node.cpp

@@ -344,7 +344,6 @@ public:
         }
     }
     bool getNetworkActive() override { return g_connman && g_connman->GetNetworkActive(); }
-    CAmount getMaxTxFee() override { return ::maxTxFee; }
     CFeeRate estimateSmartFee(int num_blocks, bool conservative, int* returned_target = nullptr) override
     {
         FeeCalculation fee_calc;

src/interfaces/node.h

@@ -229,9 +229,6 @@ public:
     //! Get network active.
     virtual bool getNetworkActive() = 0;
 
-    //! Get max tx fee.
-    virtual CAmount getMaxTxFee() = 0;
-
     //! Estimate smart fee.
     virtual CFeeRate estimateSmartFee(int num_blocks, bool conservative, int* returned_target = nullptr) = 0;
 

src/interfaces/wallet.cpp

@@ -544,6 +544,7 @@ public:
     bool hdEnabled() override { return m_wallet->IsHDEnabled(); }
     bool IsWalletFlagSet(uint64_t flag) override { return m_wallet->IsWalletFlagSet(flag); }
     CoinJoin::Client& coinJoin() override { return m_coinjoin; }
+    CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }
     void remove() override
     {
         RemoveWallet(m_wallet);

src/interfaces/wallet.h

@@ -266,6 +266,9 @@ public:
 
     virtual CoinJoin::Client& coinJoin() = 0;
 
+    //! Get max tx fee.
+    virtual CAmount getDefaultMaxTxFee() = 0;
+
     // Remove wallet.
     virtual void remove() = 0;
 

src/qt/sendcoinsdialog.cpp

@@ -666,7 +666,7 @@ void SendCoinsDialog::processSendCoinsReturn(const WalletModel::SendCoinsReturn
         msgParams.second = CClientUIInterface::MSG_ERROR;
         break;
     case WalletModel::AbsurdFee:
-        msgParams.first = tr("A fee higher than %1 is considered an absurdly high fee.").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), model->node().getMaxTxFee()));
+        msgParams.first = tr("A fee higher than %1 is considered an absurdly high fee.").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), model->wallet().getDefaultMaxTxFee()));
         break;
     case WalletModel::PaymentRequestExpired:
         msgParams.first = tr("Payment request expired.");

src/qt/walletmodel.cpp

@@ -270,9 +270,9 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
     }
 
     // reject absurdly high fee. (This can never happen because the
-    // wallet caps the fee at maxTxFee. This merely serves as a
+    // wallet caps the fee at m_default_max_tx_fee. This merely serves as a
     // belt-and-suspenders check)
-    if (nFeeRequired > m_node.getMaxTxFee())
+    if (nFeeRequired > m_wallet->getDefaultMaxTxFee())
         return AbsurdFee;
 
     return SendCoinsReturn(OK);

src/validation.cpp

@@ -156,7 +156,6 @@ uint256 hashAssumeValid;
 arith_uint256 nMinimumChainWork;
 
 CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE);
-CAmount maxTxFee = DEFAULT_TRANSACTION_MAXFEE;
 
 CBlockPolicyEstimator feeEstimator;
 CTxMemPool mempool(&feeEstimator);

src/validation.h

@@ -53,12 +53,6 @@ struct LockPoints;
 
 /** Default for -minrelaytxfee, minimum relay fee for transactions */
 static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 1000;
-//! -maxtxfee default
-static const CAmount DEFAULT_TRANSACTION_MAXFEE = COIN / 10;
-//! Discourage users to set fees higher than this amount (in duffs) per kB
-static const CAmount HIGH_TX_FEE_PER_KB = COIN / 100;
-//! -maxtxfee will warn if called with a higher fee than this amount (in duffs)
-static const CAmount HIGH_MAX_TX_FEE = 100 * HIGH_TX_FEE_PER_KB;
 /** Default for -limitancestorcount, max number of in-mempool ancestors */
 static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
 /** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool ancestors */
@@ -146,8 +140,6 @@ extern bool fCheckpointsEnabled;
 extern size_t nCoinCacheUsage;
 /** A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation) */
 extern CFeeRate minRelayTxFee;
-/** Absolute maximum transaction fee (in duffs) used by wallet and mempool (rejects high fee in sendrawtransaction) */
-extern CAmount maxTxFee;
 /** If the tip is older than this (in seconds), the node is considered to be in initial block download. */
 extern int64_t nMaxTipAge;
 

src/wallet/fees.cpp

@@ -22,7 +22,7 @@ CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinC
 {
     CAmount fee_needed = GetMinimumFeeRate(wallet, coin_control, feeCalc).GetFee(nTxBytes);
     // Always obey the maximum
-    const CAmount max_tx_fee = wallet.chain().maxTxFee();
+    const CAmount max_tx_fee = wallet.m_default_max_tx_fee;
     if (fee_needed > max_tx_fee) {
         fee_needed = max_tx_fee;
         if (feeCalc) feeCalc->reason = FeeReason::MAXTXFEE;

src/wallet/init.cpp

@@ -71,6 +71,8 @@ void WalletInit::AddWalletOptions() const
                                                               CURRENCY_UNIT, FormatMoney(DEFAULT_DISCARD_FEE)), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET_FEE);
     gArgs.AddArg("-fallbackfee=<amt>", strprintf("A fee rate (in %s/kB) that will be used when fee estimation has insufficient data (default: %s)",
                                                                CURRENCY_UNIT, FormatMoney(DEFAULT_FALLBACK_FEE)), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET_FEE);
+    gArgs.AddArg("-maxtxfee=<amt>", strprintf("Maximum total fees (in %s) to use in a single wallet transaction; setting this too low may abort large transactions (default: %s)",
+                                                            CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)), ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-mintxfee=<amt>", strprintf("Fees (in %s/kB) smaller than this are considered zero fee for transaction creation (default: %s)",
                                                             CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MINFEE)), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET_FEE);
     gArgs.AddArg("-paytxfee=<amt>", strprintf("Fee (in %s/kB) to add to transactions you send (default: %s)",
@@ -165,10 +167,6 @@ bool WalletInit::ParameterInteraction() const
     if (gArgs.GetArg("-prune", 0) && gArgs.GetBoolArg("-rescan", false))
         return InitError(_("Rescans are not possible in pruned mode. You will need to use -reindex which will download the whole blockchain again."));
 
-    if (::minRelayTxFee.GetFeePerK() > HIGH_TX_FEE_PER_KB)
-        InitWarning(AmountHighWarn("-minrelaytxfee") + " " +
-                    _("The wallet will avoid paying less than the minimum relay fee."));
-
     if (gArgs.IsArgSet("-walletbackupsdir")) {
         if (!fs::is_directory(gArgs.GetArg("-walletbackupsdir", ""))) {
             InitWarning(strprintf(_("Warning: incorrect parameter %s, path must exist! Using default path."), "-walletbackupsdir"));

src/wallet/wallet.cpp

@@ -3066,7 +3066,7 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, const CoinEligibil
             utxo_pool.push_back(group);
         }
         bnb_used = false;
-        return KnapsackSolver(nTargetValue, utxo_pool, setCoinsRet, nValueRet, nCoinType == CoinType::ONLY_FULLY_MIXED, maxTxFee);
+        return KnapsackSolver(nTargetValue, utxo_pool, setCoinsRet, nValueRet, nCoinType == CoinType::ONLY_FULLY_MIXED, m_default_max_tx_fee);
     }
 }
 
@@ -5120,6 +5120,29 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
             return nullptr;
         }
     }
+
+    if (gArgs.IsArgSet("-maxtxfee"))
+    {
+        CAmount nMaxFee = 0;
+        if (!ParseMoney(gArgs.GetArg("-maxtxfee", ""), nMaxFee)) {
+            chain.initError(AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", "")));
+            return nullptr;
+        }
+        if (nMaxFee > HIGH_MAX_TX_FEE) {
+            chain.initWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction."));
+        }
+        if (CFeeRate(nMaxFee, 1000) < chain.relayMinFee()) {
+            chain.initError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
+                                       gArgs.GetArg("-maxtxfee", ""), chain.relayMinFee().ToString()));
+            return nullptr;
+        }
+        walletInstance->m_default_max_tx_fee = nMaxFee;
+    }
+
+    if (chain.relayMinFee().GetFeePerK() > HIGH_TX_FEE_PER_KB)
+        chain.initWarning(AmountHighWarn("-minrelaytxfee") + " " +
+                    _("The wallet will avoid paying less than the minimum relay fee."));
+
     walletInstance->m_confirm_target = gArgs.GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
     walletInstance->m_spend_zero_conf_change = gArgs.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
 
@@ -5528,7 +5551,7 @@ bool CWalletTx::AcceptToMemoryPool(interfaces::Chain::Lock& locked_chain, CValid
     // user could call sendmoney in a loop and hit spurious out of funds errors
     // because we think that this newly generated transaction's change is
     // unavailable as we're not yet aware that it is in the mempool.
-    bool ret = locked_chain.submitToMemoryPool(tx, pwallet->chain().maxTxFee(), state);
+    bool ret = locked_chain.submitToMemoryPool(tx, pwallet->m_default_max_tx_fee, state);
     fInMempool |= ret;
     return ret;
 }

src/wallet/wallet.h

@@ -74,6 +74,12 @@ static const bool DEFAULT_AVOIDPARTIALSPENDS = false;
 static const unsigned int DEFAULT_TX_CONFIRM_TARGET = 6;
 static const bool DEFAULT_WALLETBROADCAST = true;
 static const bool DEFAULT_DISABLE_WALLET = false;
+//! -maxtxfee default
+static const CAmount DEFAULT_TRANSACTION_MAXFEE = COIN / 10;
+//! Discourage users to set fees higher than this amount (in duffs) per kB
+static const CAmount HIGH_TX_FEE_PER_KB = COIN / 100;
+//! -maxtxfee will warn if called with a higher fee than this amount (in duffs)
+static const CAmount HIGH_MAX_TX_FEE = 100 * HIGH_TX_FEE_PER_KB;
 
 //! if set, all keys will be derived by using BIP39/BIP44
 static const bool DEFAULT_USE_HD_WALLET = false;
@@ -1065,6 +1071,8 @@ public:
      */
     CFeeRate m_fallback_fee{DEFAULT_FALLBACK_FEE};
     CFeeRate m_discard_rate{DEFAULT_DISCARD_FEE};
+    /** Absolute maximum transaction fee (in satoshis) used by default for the wallet */
+    CAmount m_default_max_tx_fee{DEFAULT_TRANSACTION_MAXFEE};
 
     bool NewKeyPool();
     size_t KeypoolCountExternalKeys() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);