BTCPrivate
/
BTCP-Rebase
mirror of https://github.com/BTCPrivate/BTCP-Rebase.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Refactor Bumpfee core functionality

This commit is contained in:
Jonas Schnelli 2017-03-03 16:15:47 +01:00
parent d1a95e8d3d
commit 0337a39d31
No known key found for this signature in database
GPG Key ID: 1EB776BB03C7922D
6 changed files with 382 additions and 221 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/Makefile.am
View File

@ -156,6 +156,7 @@ BITCOIN_CORE_H = \
wallet/coincontrol.h \
wallet/crypter.h \
wallet/db.h \
wallet/feebumper.h \
wallet/rpcwallet.h \
wallet/wallet.h \
wallet/walletdb.h \
@ -230,6 +231,7 @@ libbitcoin_wallet_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
libbitcoin_wallet_a_SOURCES = \
wallet/crypter.cpp \
wallet/db.cpp \
wallet/feebumper.cpp \
wallet/rpcdump.cpp \
wallet/rpcwallet.cpp \
wallet/wallet.cpp \

275
src/wallet/feebumper.cpp Normal file
View File

@ -0,0 +1,275 @@
// Copyright (c) 2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "consensus/validation.h"
#include "wallet/feebumper.h"
#include "wallet/wallet.h"
#include "policy/policy.h"
#include "policy/rbf.h"
#include "validation.h" //for mempool access
#include "txmempool.h"
#include "utilmoneystr.h"
#include "util.h"
#include "net.h"
// Calculate the size of the transaction assuming all signatures are max size
// Use DummySignatureCreator, which inserts 72 byte signatures everywhere.
// TODO: re-use this in CWallet::CreateTransaction (right now
// CreateTransaction uses the constructed dummy-signed tx to do a priority
// calculation, but we should be able to refactor after priority is removed).
// NOTE: this requires that all inputs must be in mapWallet (eg the tx should
// be IsAllFromMe).
int64_t CalculateMaximumSignedTxSize(const CWallet *pWallet, const CTransaction &tx)
{
CMutableTransaction txNew(tx);
std::vector<std::pair<const CWalletTx *, unsigned int>> vCoins;
// Look up the inputs. We should have already checked that this transaction
// IsAllFromMe(ISMINE_SPENDABLE), so every input should already be in our
// wallet, with a valid index into the vout array.
for (auto& input : tx.vin) {
const auto mi = pWallet->mapWallet.find(input.prevout.hash);
assert(mi != pWallet->mapWallet.end() && input.prevout.n < mi->second.tx->vout.size());
vCoins.emplace_back(std::make_pair(&(mi->second), input.prevout.n));
}
if (!pWallet->DummySignTx(txNew, vCoins)) {
// This should never happen, because IsAllFromMe(ISMINE_SPENDABLE)
// implies that we can sign for every input.
return -1;
}
return GetVirtualTransactionSize(txNew);
}
CFeeBumper::CFeeBumper(const CWallet *pWallet, const uint256 txidIn, int newConfirmTarget, bool specifiedConfirmTarget, CAmount totalFee, bool newTxReplaceable)
:
txid(txidIn),
nOldFee(0),
nNewFee(0)
{
vErrors.clear();
bumpedTxid.SetNull();
AssertLockHeld(pWallet->cs_wallet);
if (!pWallet->mapWallet.count(txid)) {
vErrors.push_back("Invalid or non-wallet transaction id");
currentResult = BumpFeeResult::INVALID_ADDRESS_OR_KEY;
return;
}
auto it = pWallet->mapWallet.find(txid);
const CWalletTx& wtx = it->second;
if (pWallet->HasWalletSpend(txid)) {
vErrors.push_back("Transaction has descendants in the wallet");
currentResult = BumpFeeResult::INVALID_PARAMETER;
return;
}
{
LOCK(mempool.cs);
auto it_mp = mempool.mapTx.find(txid);
if (it_mp != mempool.mapTx.end() && it_mp->GetCountWithDescendants() > 1) {
vErrors.push_back("Transaction has descendants in the mempool");
currentResult = BumpFeeResult::INVALID_PARAMETER;
return;
}
}
if (wtx.GetDepthInMainChain() != 0) {
vErrors.push_back("Transaction has been mined, or is conflicted with a mined transaction");
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
if (!SignalsOptInRBF(wtx)) {
vErrors.push_back("Transaction is not BIP 125 replaceable");
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
if (wtx.mapValue.count("replaced_by_txid")) {
vErrors.push_back(strprintf("Cannot bump transaction %s which was already bumped by transaction %s", txid.ToString(), wtx.mapValue.at("replaced_by_txid")));
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
// check that original tx consists entirely of our inputs
// if not, we can't bump the fee, because the wallet has no way of knowing the value of the other inputs (thus the fee)
if (!pWallet->IsAllFromMe(wtx, ISMINE_SPENDABLE)) {
vErrors.push_back("Transaction contains inputs that don't belong to this wallet");
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
// figure out which output was change
// if there was no change output or multiple change outputs, fail
int nOutput = -1;
for (size_t i = 0; i < wtx.tx->vout.size(); ++i) {
if (pWallet->IsChange(wtx.tx->vout[i])) {
if (nOutput != -1) {
vErrors.push_back("Transaction has multiple change outputs");
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
nOutput = i;
}
}
if (nOutput == -1) {
vErrors.push_back("Transaction does not have a change output");
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
// Calculate the expected size of the new transaction.
int64_t txSize = GetVirtualTransactionSize(*(wtx.tx));
const int64_t maxNewTxSize = CalculateMaximumSignedTxSize(pWallet, *wtx.tx);
if (maxNewTxSize < 0) {
vErrors.push_back("Transaction contains inputs that cannot be signed");
currentResult = BumpFeeResult::INVALID_ADDRESS_OR_KEY;
return;
}
// calculate the old fee and fee-rate
nOldFee = wtx.GetDebit(ISMINE_SPENDABLE) - wtx.tx->GetValueOut();
CFeeRate nOldFeeRate(nOldFee, 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 walletIncrementalRelayFee = CFeeRate(WALLET_INCREMENTAL_RELAY_FEE);
if (::incrementalRelayFee > walletIncrementalRelayFee) {
walletIncrementalRelayFee = ::incrementalRelayFee;
}
if (totalFee > 0) {
CAmount minTotalFee = nOldFeeRate.GetFee(maxNewTxSize) + ::incrementalRelayFee.GetFee(maxNewTxSize);
if (totalFee < minTotalFee) {
vErrors.push_back(strprintf("Insufficient totalFee, must be at least %s (oldFee %s + incrementalFee %s)",
FormatMoney(minTotalFee), FormatMoney(nOldFeeRate.GetFee(maxNewTxSize)), FormatMoney(::incrementalRelayFee.GetFee(maxNewTxSize))));
currentResult = BumpFeeResult::INVALID_PARAMETER;
return;
}
CAmount requiredFee = pWallet->GetRequiredFee(maxNewTxSize);
if (totalFee < requiredFee) {
vErrors.push_back(strprintf("Insufficient totalFee (cannot be less than required fee %s)",
FormatMoney(requiredFee)));
currentResult = BumpFeeResult::INVALID_PARAMETER;
return;
}
nNewFee = totalFee;
nNewFeeRate = CFeeRate(totalFee, maxNewTxSize);
} else {
// if user specified a confirm target then don't consider any global payTxFee
if (specifiedConfirmTarget) {
nNewFee = pWallet->GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool, CAmount(0));
}
// otherwise use the regular wallet logic to select payTxFee or default confirm target
else {
nNewFee = pWallet->GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool);
}
nNewFeeRate = CFeeRate(nNewFee, 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());
nNewFee = nNewFeeRate.GetFee(maxNewTxSize);
}
}
// Check that in all cases the new fee doesn't violate maxTxFee
if (nNewFee > maxTxFee) {
vErrors.push_back(strprintf("Specified or calculated fee %s is too high (cannot be higher than maxTxFee %s)",
FormatMoney(nNewFee), FormatMoney(maxTxFee)));
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
// check that fee rate is higher than mempool's minimum fee
// (no point in bumping fee if we know that the new tx won't be accepted to the mempool)
// 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 totalFee to make an adjustment.
CFeeRate minMempoolFeeRate = mempool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
if (nNewFeeRate.GetFeePerK() < minMempoolFeeRate.GetFeePerK()) {
vErrors.push_back(strprintf("New fee rate (%s) is less than the minimum fee rate (%s) to get into the mempool. totalFee value should to be at least %s or settxfee value should be at least %s to add transaction.", FormatMoney(nNewFeeRate.GetFeePerK()), FormatMoney(minMempoolFeeRate.GetFeePerK()), FormatMoney(minMempoolFeeRate.GetFee(maxNewTxSize)), FormatMoney(minMempoolFeeRate.GetFeePerK())));
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
// Now modify the output to increase the fee.
// If the output is not large enough to pay the fee, fail.
CAmount nDelta = nNewFee - nOldFee;
assert(nDelta > 0);
mtx = *wtx.tx;
CTxOut* poutput = &(mtx.vout[nOutput]);
if (poutput->nValue < nDelta) {
vErrors.push_back("Change output is too small to bump the fee");
currentResult = BumpFeeResult::WALLET_ERROR;
return;
}
// If the output would become dust, discard it (converting the dust to fee)
poutput->nValue -= nDelta;
if (poutput->nValue <= poutput->GetDustThreshold(::dustRelayFee)) {
LogPrint(BCLog::RPC, "Bumping fee and discarding dust output\n");
nNewFee += poutput->nValue;
mtx.vout.erase(mtx.vout.begin() + nOutput);
}
// Mark new tx not replaceable, if requested.
if (!newTxReplaceable) {
for (auto& input : mtx.vin) {
if (input.nSequence < 0xfffffffe) input.nSequence = 0xfffffffe;
}
}
currentResult = BumpFeeResult::OK;
}
bool CFeeBumper::commit(CWallet *pWallet)
{
AssertLockHeld(pWallet->cs_wallet);
vErrors.clear();
if (txid.IsNull() || !pWallet->mapWallet.count(txid)) {
vErrors.push_back("Invalid or non-wallet transaction id");
currentResult = BumpFeeResult::MISC_ERROR;
}
CWalletTx& oldWtx = pWallet->mapWallet[txid];
CWalletTx wtxBumped(pWallet, MakeTransactionRef(std::move(mtx)));
// commit/broadcast the tx
CReserveKey reservekey(pWallet);
wtxBumped.mapValue = oldWtx.mapValue;
wtxBumped.mapValue["replaces_txid"] = oldWtx.GetHash().ToString();
wtxBumped.vOrderForm = oldWtx.vOrderForm;
wtxBumped.strFromAccount = oldWtx.strFromAccount;
wtxBumped.fTimeReceivedIsTxTime = true;
wtxBumped.fFromMe = true;
CValidationState state;
if (!pWallet->CommitTransaction(wtxBumped, reservekey, g_connman.get(), state)) {
// NOTE: CommitTransaction never returns false, so this should never happen.
vErrors.push_back(strprintf("Error: The transaction was rejected! Reason given: %s", state.GetRejectReason()));
return false;
}
bumpedTxid = wtxBumped.GetHash();
if (state.IsInvalid()) {
// This can happen if the mempool rejected the transaction. Report
// what happened in the "errors" response.
vErrors.push_back(strprintf("Error: The transaction was rejected: %s", FormatStateMessage(state)));
}
// mark the original tx as bumped
if (!pWallet->MarkReplaced(oldWtx.GetHash(), wtxBumped.GetHash())) {
// TODO: see if JSON-RPC has a standard way of returning a response
// along with an exception. It would be good to return information about
// wtxBumped to the caller even if marking the original transaction
// replaced does not succeed for some reason.
vErrors.push_back("Error: Created new bumpfee transaction but could not mark the original transaction as replaced.");
}
return true;
}

46
src/wallet/feebumper.h Normal file
View File

@ -0,0 +1,46 @@
// Copyright (c) 2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_WALLET_FEEBUMPER_H
#define BITCOIN_WALLET_FEEBUMPER_H
#include <primitives/transaction.h>
class CWallet;
class uint256;
enum class BumpFeeResult
{
OK,
INVALID_ADDRESS_OR_KEY,
INVALID_REQUEST,
INVALID_PARAMETER,
WALLET_ERROR,
MISC_ERROR,
};
class CFeeBumper
{
public:
CFeeBumper(const CWallet *pWalletIn, const uint256 txidIn, int newConfirmTarget, bool specifiedConfirmTarget, CAmount totalFee, bool newTxReplaceable);
BumpFeeResult getResult() const { return currentResult; }
const std::vector<std::string>& getErrors() const { return vErrors; }
CAmount getOldFee() const { return nOldFee; }
CAmount getNewFee() const { return nNewFee; }
CMutableTransaction* getBumpedTxRef() { return &mtx; }
uint256 getBumpedTxId() const { return bumpedTxid; }
bool commit(CWallet *pWalletNonConst);
private:
const uint256 txid;
uint256 bumpedTxid;
CMutableTransaction mtx;
std::vector<std::string> vErrors;
BumpFeeResult currentResult;
CAmount nOldFee;
CAmount nNewFee;
};
#endif // BITCOIN_WALLET_FEEBUMPER_H

254
src/wallet/rpcwallet.cpp
View File

@ -18,8 +18,9 @@
#include "timedata.h"
#include "util.h"
#include "utilmoneystr.h"
#include "wallet.h"
#include "walletdb.h"
#include "wallet/feebumper.h"
#include "wallet/wallet.h"
#include "wallet/walletdb.h"
#include <stdint.h>
@ -2778,33 +2779,6 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
return result;
}
// Calculate the size of the transaction assuming all signatures are max size
// Use DummySignatureCreator, which inserts 72 byte signatures everywhere.
// TODO: re-use this in CWallet::CreateTransaction (right now
// CreateTransaction uses the constructed dummy-signed tx to do a priority
// calculation, but we should be able to refactor after priority is removed).
// NOTE: this requires that all inputs must be in mapWallet (eg the tx should
// be IsAllFromMe).
int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, CWallet &wallet)
{
CMutableTransaction txNew(tx);
std::vector<std::pair<CWalletTx*, unsigned int>> vCoins;
// Look up the inputs. We should have already checked that this transaction
// IsAllFromMe(ISMINE_SPENDABLE), so every input should already be in our
// wallet, with a valid index into the vout array.
for (auto& input : tx.vin) {
const auto mi = wallet.mapWallet.find(input.prevout.hash);
assert(mi != wallet.mapWallet.end() && input.prevout.n < mi->second.tx->vout.size());
vCoins.emplace_back(std::make_pair(&(mi->second), input.prevout.n));
}
if (!wallet.DummySignTx(txNew, vCoins)) {
// This should never happen, because IsAllFromMe(ISMINE_SPENDABLE)
// implies that we can sign for every input.
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction contains inputs that cannot be signed");
}
return GetVirtualTransactionSize(txNew);
}
UniValue bumpfee(const JSONRPCRequest& request)
{
CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
@ -2891,206 +2865,48 @@ UniValue bumpfee(const JSONRPCRequest& request)
}
}
// retrieve the original tx from the wallet
LOCK2(cs_main, pwallet->cs_wallet);
EnsureWalletIsUnlocked(pwallet);
if (!pwallet->mapWallet.count(hash)) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid or non-wallet transaction id");
}
CWalletTx& wtx = pwallet->mapWallet[hash];
if (pwallet->HasWalletSpend(hash)) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Transaction has descendants in the wallet");
}
CFeeBumper feeBump(pwallet, hash, newConfirmTarget, specifiedConfirmTarget, totalFee, replaceable);
BumpFeeResult res = feeBump.getResult();
if (res != BumpFeeResult::OK)
{
LOCK(mempool.cs);
auto it = mempool.mapTx.find(hash);
if (it != mempool.mapTx.end() && it->GetCountWithDescendants() > 1) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Transaction has descendants in the mempool");
switch(res) {
case BumpFeeResult::INVALID_ADDRESS_OR_KEY:
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, feeBump.getErrors()[0]);
break;
case BumpFeeResult::INVALID_REQUEST:
throw JSONRPCError(RPC_INVALID_REQUEST, feeBump.getErrors()[0]);
break;
case BumpFeeResult::INVALID_PARAMETER:
throw JSONRPCError(RPC_INVALID_PARAMETER, feeBump.getErrors()[0]);
break;
case BumpFeeResult::WALLET_ERROR:
throw JSONRPCError(RPC_WALLET_ERROR, feeBump.getErrors()[0]);
break;
default:
throw JSONRPCError(RPC_MISC_ERROR, feeBump.getErrors()[0]);
break;
}
}
if (wtx.GetDepthInMainChain() != 0) {
throw JSONRPCError(RPC_WALLET_ERROR, "Transaction has been mined, or is conflicted with a mined transaction");
// sign bumped transaction
if (!pwallet->SignTransaction(*feeBump.getBumpedTxRef())) {
throw JSONRPCError(RPC_WALLET_ERROR, "Can't sign transaction.");
}
if (!SignalsOptInRBF(wtx)) {
throw JSONRPCError(RPC_WALLET_ERROR, "Transaction is not BIP 125 replaceable");
// commit the bumped transaction
if(!feeBump.commit(pwallet)) {
throw JSONRPCError(RPC_WALLET_ERROR, feeBump.getErrors()[0]);
}
if (wtx.mapValue.count("replaced_by_txid")) {
throw JSONRPCError(RPC_WALLET_ERROR, strprintf("Cannot bump transaction %s which was already bumped by transaction %s", hash.ToString(), wtx.mapValue.at("replaced_by_txid")));
}
// check that original tx consists entirely of our inputs
// if not, we can't bump the fee, because the wallet has no way of knowing the value of the other inputs (thus the fee)
if (!pwallet->IsAllFromMe(wtx, ISMINE_SPENDABLE)) {
throw JSONRPCError(RPC_WALLET_ERROR, "Transaction contains inputs that don't belong to this wallet");
}
// figure out which output was change
// if there was no change output or multiple change outputs, fail
int nOutput = -1;
for (size_t i = 0; i < wtx.tx->vout.size(); ++i) {
if (pwallet->IsChange(wtx.tx->vout[i])) {
if (nOutput != -1) {
throw JSONRPCError(RPC_WALLET_ERROR, "Transaction has multiple change outputs");
}
nOutput = i;
}
}
if (nOutput == -1) {
throw JSONRPCError(RPC_WALLET_ERROR, "Transaction does not have a change output");
}
// Calculate the expected size of the new transaction.
int64_t txSize = GetVirtualTransactionSize(*(wtx.tx));
const int64_t maxNewTxSize = CalculateMaximumSignedTxSize(*wtx.tx, *pwallet);
// calculate the old fee and fee-rate
CAmount nOldFee = wtx.GetDebit(ISMINE_SPENDABLE) - wtx.tx->GetValueOut();
CFeeRate nOldFeeRate(nOldFee, txSize);
CAmount nNewFee;
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 walletIncrementalRelayFee = CFeeRate(WALLET_INCREMENTAL_RELAY_FEE);
if (::incrementalRelayFee > walletIncrementalRelayFee) {
walletIncrementalRelayFee = ::incrementalRelayFee;
}
if (totalFee > 0) {
CAmount minTotalFee = nOldFeeRate.GetFee(maxNewTxSize) + ::incrementalRelayFee.GetFee(maxNewTxSize);
if (totalFee < minTotalFee) {
throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Insufficient totalFee, must be at least %s (oldFee %s + incrementalFee %s)",
FormatMoney(minTotalFee), FormatMoney(nOldFeeRate.GetFee(maxNewTxSize)), FormatMoney(::incrementalRelayFee.GetFee(maxNewTxSize))));
}
CAmount requiredFee = CWallet::GetRequiredFee(maxNewTxSize);
if (totalFee < requiredFee ) {
throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Insufficient totalFee (cannot be less than required fee %s)",
FormatMoney(requiredFee)));
}
nNewFee = totalFee;
nNewFeeRate = CFeeRate(totalFee, maxNewTxSize);
} else {
// if user specified a confirm target then don't consider any global payTxFee
if (specifiedConfirmTarget) {
nNewFee = CWallet::GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool, CAmount(0));
}
// otherwise use the regular wallet logic to select payTxFee or default confirm target
else {
nNewFee = CWallet::GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool);
}
nNewFeeRate = CFeeRate(nNewFee, 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());
nNewFee = nNewFeeRate.GetFee(maxNewTxSize);
}
}
// Check that in all cases the new fee doesn't violate maxTxFee
if (nNewFee > maxTxFee) {
throw JSONRPCError(RPC_WALLET_ERROR,
strprintf("Specified or calculated fee %s is too high (cannot be higher than maxTxFee %s)",
FormatMoney(nNewFee), FormatMoney(maxTxFee)));
}
// check that fee rate is higher than mempool's minimum fee
// (no point in bumping fee if we know that the new tx won't be accepted to the mempool)
// 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 totalFee to make an adjustment.
CFeeRate minMempoolFeeRate = mempool.GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
if (nNewFeeRate.GetFeePerK() < minMempoolFeeRate.GetFeePerK()) {
throw JSONRPCError(RPC_WALLET_ERROR, strprintf("New fee rate (%s) is less than the minimum fee rate (%s) to get into the mempool. totalFee value should to be at least %s or settxfee value should be at least %s to add transaction.", FormatMoney(nNewFeeRate.GetFeePerK()), FormatMoney(minMempoolFeeRate.GetFeePerK()), FormatMoney(minMempoolFeeRate.GetFee(maxNewTxSize)), FormatMoney(minMempoolFeeRate.GetFeePerK())));
}
// Now modify the output to increase the fee.
// If the output is not large enough to pay the fee, fail.
CAmount nDelta = nNewFee - nOldFee;
assert(nDelta > 0);
CMutableTransaction tx(*(wtx.tx));
CTxOut* poutput = &(tx.vout[nOutput]);
if (poutput->nValue < nDelta) {
throw JSONRPCError(RPC_WALLET_ERROR, "Change output is too small to bump the fee");
}
// If the output would become dust, discard it (converting the dust to fee)
poutput->nValue -= nDelta;
if (poutput->nValue <= poutput->GetDustThreshold(::dustRelayFee)) {
LogPrint(BCLog::RPC, "Bumping fee and discarding dust output\n");
nNewFee += poutput->nValue;
tx.vout.erase(tx.vout.begin() + nOutput);
}
// Mark new tx not replaceable, if requested.
if (!replaceable) {
for (auto& input : tx.vin) {
if (input.nSequence < 0xfffffffe) input.nSequence = 0xfffffffe;
}
}
// sign the new tx
CTransaction txNewConst(tx);
int nIn = 0;
for (auto& input : tx.vin) {
std::map<uint256, CWalletTx>::const_iterator mi = pwallet->mapWallet.find(input.prevout.hash);
assert(mi != pwallet->mapWallet.end() && input.prevout.n < mi->second.tx->vout.size());
const CScript& scriptPubKey = mi->second.tx->vout[input.prevout.n].scriptPubKey;
const CAmount& amount = mi->second.tx->vout[input.prevout.n].nValue;
SignatureData sigdata;
if (!ProduceSignature(TransactionSignatureCreator(pwallet, &txNewConst, nIn, amount, SIGHASH_ALL), scriptPubKey, sigdata)) {
throw JSONRPCError(RPC_WALLET_ERROR, "Can't sign transaction.");
}
UpdateTransaction(tx, nIn, sigdata);
nIn++;
}
// commit/broadcast the tx
CReserveKey reservekey(pwallet);
CWalletTx wtxBumped(pwallet, MakeTransactionRef(std::move(tx)));
wtxBumped.mapValue = wtx.mapValue;
wtxBumped.mapValue["replaces_txid"] = hash.ToString();
wtxBumped.vOrderForm = wtx.vOrderForm;
wtxBumped.strFromAccount = wtx.strFromAccount;
wtxBumped.fTimeReceivedIsTxTime = true;
wtxBumped.fFromMe = true;
CValidationState state;
if (!pwallet->CommitTransaction(wtxBumped, reservekey, g_connman.get(), state)) {
// NOTE: CommitTransaction never returns false, so this should never happen.
throw JSONRPCError(RPC_WALLET_ERROR, strprintf("Error: The transaction was rejected! Reason given: %s", state.GetRejectReason()));
}
UniValue vErrors(UniValue::VARR);
if (state.IsInvalid()) {
// This can happen if the mempool rejected the transaction. Report
// what happened in the "errors" response.
vErrors.push_back(strprintf("Error: The transaction was rejected: %s", FormatStateMessage(state)));
}
// mark the original tx as bumped
if (!pwallet->MarkReplaced(wtx.GetHash(), wtxBumped.GetHash())) {
// TODO: see if JSON-RPC has a standard way of returning a response
// along with an exception. It would be good to return information about
// wtxBumped to the caller even if marking the original transaction
// replaced does not succeed for some reason.
vErrors.push_back("Error: Created new bumpfee transaction but could not mark the original transaction as replaced.");
}
UniValue result(UniValue::VOBJ);
result.push_back(Pair("txid", wtxBumped.GetHash().GetHex()));
result.push_back(Pair("origfee", ValueFromAmount(nOldFee)));
result.push_back(Pair("fee", ValueFromAmount(nNewFee)));
result.push_back(Pair("errors", vErrors));
result.push_back(Pair("txid", feeBump.getBumpedTxId().GetHex()));
result.push_back(Pair("origfee", ValueFromAmount(feeBump.getOldFee())));
result.push_back(Pair("fee", ValueFromAmount(feeBump.getNewFee())));
UniValue errors(UniValue::VARR);
for (const std::string& err: feeBump.getErrors())
errors.push_back(err);
result.push_back(errors);
return result;
}

21
src/wallet/wallet.cpp
View File

@ -16,6 +16,7 @@
#include "validation.h"
#include "net.h"
#include "policy/policy.h"
#include "policy/rbf.h"
#include "primitives/block.h"
#include "primitives/transaction.h"
#include "script/script.h"
@ -2255,6 +2256,26 @@ bool CWallet::SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAm
return res;
}
bool CWallet::SignTransaction(CMutableTransaction &tx)
{
// sign the new tx
CTransaction txNewConst(tx);
int nIn = 0;
for (auto& input : tx.vin) {
std::map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(input.prevout.hash);
assert(mi != mapWallet.end() && input.prevout.n < mi->second.tx->vout.size());
const CScript& scriptPubKey = mi->second.tx->vout[input.prevout.n].scriptPubKey;
const CAmount& amount = mi->second.tx->vout[input.prevout.n].nValue;
SignatureData sigdata;
if (!ProduceSignature(TransactionSignatureCreator(this, &txNewConst, nIn, amount, SIGHASH_ALL), scriptPubKey, sigdata)) {
return false;
}
UpdateTransaction(tx, nIn, sigdata);
nIn++;
}
return true;
}
bool CWallet::FundTransaction(CMutableTransaction& tx, CAmount& nFeeRet, bool overrideEstimatedFeeRate, const CFeeRate& specificFeeRate, int& nChangePosInOut, std::string& strFailReason, bool includeWatching, bool lockUnspents, const std::set<int>& setSubtractFeeFromOutputs, bool keepReserveKey, const CTxDestination& destChange)
{
std::vector<CRecipient> vecSend;

5
src/wallet/wallet.h
View File

@ -867,6 +867,7 @@ public:
* calling CreateTransaction();
*/
bool FundTransaction(CMutableTransaction& tx, CAmount& nFeeRet, bool overrideEstimatedFeeRate, const CFeeRate& specificFeeRate, int& nChangePosInOut, std::string& strFailReason, bool includeWatching, bool lockUnspents, const std::set<int>& setSubtractFeeFromOutputs, bool keepReserveKey = true, const CTxDestination& destChange = CNoDestination());
bool SignTransaction(CMutableTransaction& tx);
/**
* Create a new transaction paying the recipients with a set of coins
@ -881,7 +882,7 @@ public:
bool AddAccountingEntry(const CAccountingEntry&);
bool AddAccountingEntry(const CAccountingEntry&, CWalletDB *pwalletdb);
template <typename ContainerType>
bool DummySignTx(CMutableTransaction &txNew, const ContainerType &coins);
bool DummySignTx(CMutableTransaction &txNew, const ContainerType &coins) const;
static CFeeRate minTxFee;
static CFeeRate fallbackFee;
@ -1125,7 +1126,7 @@ public:
// ContainerType is meant to hold pair<CWalletTx *, int>, and be iterable
// so that each entry corresponds to each vIn, in order.
template <typename ContainerType>
bool CWallet::DummySignTx(CMutableTransaction &txNew, const ContainerType &coins)
bool CWallet::DummySignTx(CMutableTransaction &txNew, const ContainerType &coins) const
{
// Fill in dummy signatures for fee calculation.
int nIn = 0;