diff options
Diffstat (limited to 'src/wallet/feebumper.cpp')
-rw-r--r-- | src/wallet/feebumper.cpp | 185 |
1 files changed, 135 insertions, 50 deletions
diff --git a/src/wallet/feebumper.cpp b/src/wallet/feebumper.cpp index 7a71aea715..46cf6b7616 100644 --- a/src/wallet/feebumper.cpp +++ b/src/wallet/feebumper.cpp @@ -1,4 +1,4 @@ -// Copyright (c) 2017-2018 The Bitcoin Core developers +// Copyright (c) 2017-2019 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -10,12 +10,10 @@ #include <wallet/wallet.h> #include <policy/fees.h> #include <policy/policy.h> -#include <policy/rbf.h> -#include <validation.h> //for mempool access -#include <txmempool.h> #include <util/moneystr.h> +#include <util/rbf.h> #include <util/system.h> -#include <net.h> +#include <util/validation.h> //! Check whether transaction has descendant in wallet or mempool, or has been //! mined, or conflicts with a mined transaction. Return a feebumper::Result. @@ -27,9 +25,7 @@ static feebumper::Result PreconditionChecks(interfaces::Chain::Lock& locked_chai } { - LOCK(mempool.cs); - auto it_mp = mempool.mapTx.find(wtx.GetHash()); - if (it_mp != mempool.mapTx.end() && it_mp->GetCountWithDescendants() > 1) { + if (wallet->chain().hasDescendantsInMempool(wtx.GetHash())) { errors.push_back("Transaction has descendants in the mempool"); return feebumper::Result::INVALID_PARAMETER; } @@ -75,9 +71,11 @@ bool TransactionCanBeBumped(const CWallet* wallet, const uint256& txid) return res == feebumper::Result::OK; } -Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoinControl& coin_control, CAmount total_fee, std::vector<std::string>& errors, - CAmount& old_fee, CAmount& new_fee, CMutableTransaction& mtx) +Result CreateTotalBumpTransaction(const CWallet* wallet, const uint256& txid, const CCoinControl& coin_control, CAmount total_fee, std::vector<std::string>& errors, + CAmount& old_fee, CAmount& new_fee, CMutableTransaction& mtx) { + new_fee = total_fee; + auto locked_chain = wallet->chain().lock(); LOCK(wallet->cs_wallet); errors.clear(); @@ -121,49 +119,33 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin // calculate the old fee and fee-rate old_fee = wtx.GetDebit(ISMINE_SPENDABLE) - wtx.tx->GetValueOut(); CFeeRate nOldFeeRate(old_fee, txSize); - CFeeRate nNewFeeRate; // The wallet uses a conservative WALLET_INCREMENTAL_RELAY_FEE value to // future proof against changes to network wide policy for incremental relay // fee that our node may not be aware of. + CFeeRate nodeIncrementalRelayFee = wallet->chain().relayIncrementalFee(); CFeeRate walletIncrementalRelayFee = CFeeRate(WALLET_INCREMENTAL_RELAY_FEE); - if (::incrementalRelayFee > walletIncrementalRelayFee) { - walletIncrementalRelayFee = ::incrementalRelayFee; + if (nodeIncrementalRelayFee > walletIncrementalRelayFee) { + walletIncrementalRelayFee = nodeIncrementalRelayFee; } - if (total_fee > 0) { - CAmount minTotalFee = nOldFeeRate.GetFee(maxNewTxSize) + ::incrementalRelayFee.GetFee(maxNewTxSize); - if (total_fee < minTotalFee) { - errors.push_back(strprintf("Insufficient totalFee, must be at least %s (oldFee %s + incrementalFee %s)", - FormatMoney(minTotalFee), FormatMoney(nOldFeeRate.GetFee(maxNewTxSize)), FormatMoney(::incrementalRelayFee.GetFee(maxNewTxSize)))); - return Result::INVALID_PARAMETER; - } - CAmount requiredFee = GetRequiredFee(*wallet, maxNewTxSize); - if (total_fee < requiredFee) { - errors.push_back(strprintf("Insufficient totalFee (cannot be less than required fee %s)", - FormatMoney(requiredFee))); - return Result::INVALID_PARAMETER; - } - new_fee = total_fee; - nNewFeeRate = CFeeRate(total_fee, maxNewTxSize); - } else { - new_fee = GetMinimumFee(*wallet, maxNewTxSize, coin_control, mempool, ::feeEstimator, nullptr /* FeeCalculation */); - nNewFeeRate = CFeeRate(new_fee, maxNewTxSize); - - // New fee rate must be at least old rate + minimum incremental relay rate - // walletIncrementalRelayFee.GetFeePerK() should be exact, because it's initialized - // in that unit (fee per kb). - // However, nOldFeeRate is a calculated value from the tx fee/size, so - // add 1 satoshi to the result, because it may have been rounded down. - if (nNewFeeRate.GetFeePerK() < nOldFeeRate.GetFeePerK() + 1 + walletIncrementalRelayFee.GetFeePerK()) { - nNewFeeRate = CFeeRate(nOldFeeRate.GetFeePerK() + 1 + walletIncrementalRelayFee.GetFeePerK()); - new_fee = nNewFeeRate.GetFee(maxNewTxSize); - } + CAmount minTotalFee = nOldFeeRate.GetFee(maxNewTxSize) + nodeIncrementalRelayFee.GetFee(maxNewTxSize); + if (total_fee < minTotalFee) { + errors.push_back(strprintf("Insufficient totalFee, must be at least %s (oldFee %s + incrementalFee %s)", + FormatMoney(minTotalFee), FormatMoney(nOldFeeRate.GetFee(maxNewTxSize)), FormatMoney(nodeIncrementalRelayFee.GetFee(maxNewTxSize)))); + return Result::INVALID_PARAMETER; + } + CAmount requiredFee = GetRequiredFee(*wallet, maxNewTxSize); + if (total_fee < requiredFee) { + errors.push_back(strprintf("Insufficient totalFee (cannot be less than required fee %s)", + FormatMoney(requiredFee))); + return Result::INVALID_PARAMETER; } // Check that in all cases the new fee doesn't violate maxTxFee - if (new_fee > maxTxFee) { - errors.push_back(strprintf("Specified or calculated fee %s is too high (cannot be higher than maxTxFee %s)", - FormatMoney(new_fee), FormatMoney(maxTxFee))); + const CAmount max_tx_fee = wallet->m_default_max_tx_fee; + if (new_fee > max_tx_fee) { + errors.push_back(strprintf("Specified or calculated fee %s is too high (cannot be higher than -maxtxfee %s)", + FormatMoney(new_fee), FormatMoney(max_tx_fee))); return Result::WALLET_ERROR; } @@ -172,15 +154,15 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin // This may occur if the user set TotalFee or paytxfee too low, if fallbackfee is too low, or, perhaps, // in a rare situation where the mempool minimum fee increased significantly since the fee estimation just a // moment earlier. In this case, we report an error to the user, who may use total_fee to make an adjustment. - CFeeRate minMempoolFeeRate = mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000); + CFeeRate minMempoolFeeRate = wallet->chain().mempoolMinFee(); + CFeeRate nNewFeeRate = CFeeRate(total_fee, maxNewTxSize); if (nNewFeeRate.GetFeePerK() < minMempoolFeeRate.GetFeePerK()) { errors.push_back(strprintf( "New fee rate (%s) is lower than the minimum fee rate (%s) to get into the mempool -- " - "the totalFee value should be at least %s or the settxfee value should be at least %s to add transaction", + "the totalFee value should be at least %s to add transaction", FormatMoney(nNewFeeRate.GetFeePerK()), FormatMoney(minMempoolFeeRate.GetFeePerK()), - FormatMoney(minMempoolFeeRate.GetFee(maxNewTxSize)), - FormatMoney(minMempoolFeeRate.GetFeePerK()))); + FormatMoney(minMempoolFeeRate.GetFee(maxNewTxSize)))); return Result::WALLET_ERROR; } @@ -197,7 +179,7 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin // If the output would become dust, discard it (converting the dust to fee) poutput->nValue -= nDelta; - if (poutput->nValue <= GetDustThreshold(*poutput, GetDiscardRate(*wallet, ::feeEstimator))) { + if (poutput->nValue <= GetDustThreshold(*poutput, GetDiscardRate(*wallet))) { wallet->WalletLogPrintf("Bumping fee and discarding dust output\n"); new_fee += poutput->nValue; mtx.vout.erase(mtx.vout.begin() + nOutput); @@ -210,6 +192,109 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin } } + return Result::OK; +} + + +Result CreateRateBumpTransaction(CWallet* wallet, const uint256& txid, const CCoinControl& coin_control, std::vector<std::string>& errors, + CAmount& old_fee, CAmount& new_fee, CMutableTransaction& mtx) +{ + // We are going to modify coin control later, copy to re-use + CCoinControl new_coin_control(coin_control); + + auto locked_chain = wallet->chain().lock(); + LOCK(wallet->cs_wallet); + errors.clear(); + auto it = wallet->mapWallet.find(txid); + if (it == wallet->mapWallet.end()) { + errors.push_back("Invalid or non-wallet transaction id"); + return Result::INVALID_ADDRESS_OR_KEY; + } + const CWalletTx& wtx = it->second; + + Result result = PreconditionChecks(*locked_chain, wallet, wtx, errors); + if (result != Result::OK) { + return result; + } + + // Fill in recipients(and preserve a single change key if there is one) + std::vector<CRecipient> recipients; + for (const auto& output : wtx.tx->vout) { + if (!wallet->IsChange(output)) { + CRecipient recipient = {output.scriptPubKey, output.nValue, false}; + recipients.push_back(recipient); + } else { + CTxDestination change_dest; + ExtractDestination(output.scriptPubKey, change_dest); + new_coin_control.destChange = change_dest; + } + } + + // Get the fee rate of the original transaction. This is calculated from + // the tx fee/vsize, so it may have been rounded down. Add 1 satoshi to the + // result. + old_fee = wtx.GetDebit(ISMINE_SPENDABLE) - wtx.tx->GetValueOut(); + int64_t txSize = GetVirtualTransactionSize(*(wtx.tx)); + // Feerate of thing we are bumping + CFeeRate feerate(old_fee, txSize); + feerate += CFeeRate(1); + + // The node has a configurable incremental relay fee. Increment the fee by + // the minimum of that and the wallet's conservative + // WALLET_INCREMENTAL_RELAY_FEE value to future proof against changes to + // network wide policy for incremental relay fee that our node may not be + // aware of. This ensures we're over the over the required relay fee rate + // (BIP 125 rule 4). The replacement tx will be at least as large as the + // original tx, so the total fee will be greater (BIP 125 rule 3) + CFeeRate node_incremental_relay_fee = wallet->chain().relayIncrementalFee(); + CFeeRate wallet_incremental_relay_fee = CFeeRate(WALLET_INCREMENTAL_RELAY_FEE); + feerate += std::max(node_incremental_relay_fee, wallet_incremental_relay_fee); + + // Fee rate must also be at least the wallet's GetMinimumFeeRate + CFeeRate min_feerate(GetMinimumFeeRate(*wallet, new_coin_control, /* feeCalc */ nullptr)); + + // Set the required fee rate for the replacement transaction in coin control. + new_coin_control.m_feerate = std::max(feerate, min_feerate); + + // Fill in required inputs we are double-spending(all of them) + // N.B.: bip125 doesn't require all the inputs in the replaced transaction to be + // used in the replacement transaction, but it's very important for wallets to make + // sure that happens. If not, it would be possible to bump a transaction A twice to + // A2 and A3 where A2 and A3 don't conflict (or alternatively bump A to A2 and A2 + // to A3 where A and A3 don't conflict). If both later get confirmed then the sender + // has accidentally double paid. + for (const auto& inputs : wtx.tx->vin) { + new_coin_control.Select(COutPoint(inputs.prevout)); + } + new_coin_control.fAllowOtherInputs = true; + + // We cannot source new unconfirmed inputs(bip125 rule 2) + new_coin_control.m_min_depth = 1; + + CTransactionRef tx_new = MakeTransactionRef(); + CReserveKey reservekey(wallet); + CAmount fee_ret; + int change_pos_in_out = -1; // No requested location for change + std::string fail_reason; + if (!wallet->CreateTransaction(*locked_chain, recipients, tx_new, reservekey, fee_ret, change_pos_in_out, fail_reason, new_coin_control, false)) { + errors.push_back("Unable to create transaction: " + fail_reason); + return Result::WALLET_ERROR; + } + + // If change key hasn't been ReturnKey'ed by this point, we take it out of keypool + reservekey.KeepKey(); + + // Write back new fee if successful + new_fee = fee_ret; + + // Write back transaction + mtx = CMutableTransaction(*tx_new); + // Mark new tx not replaceable, if requested. + if (!coin_control.m_signal_bip125_rbf.get_value_or(wallet->m_signal_rbf)) { + for (auto& input : mtx.vin) { + if (input.nSequence < 0xfffffffe) input.nSequence = 0xfffffffe; + } + } return Result::OK; } @@ -247,7 +332,7 @@ Result CommitTransaction(CWallet* wallet, const uint256& txid, CMutableTransacti CReserveKey reservekey(wallet); CValidationState state; - if (!wallet->CommitTransaction(tx, std::move(mapValue), oldWtx.vOrderForm, reservekey, g_connman.get(), state)) { + if (!wallet->CommitTransaction(tx, std::move(mapValue), oldWtx.vOrderForm, reservekey, state)) { // NOTE: CommitTransaction never returns false, so this should never happen. errors.push_back(strprintf("The transaction was rejected: %s", FormatStateMessage(state))); return Result::WALLET_ERROR; |