aboutsummaryrefslogtreecommitdiff
path: root/src/wallet/feebumper.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/wallet/feebumper.cpp')
-rw-r--r--src/wallet/feebumper.cpp155
1 files changed, 121 insertions, 34 deletions
diff --git a/src/wallet/feebumper.cpp b/src/wallet/feebumper.cpp
index b547ea21d9..4ec9dca420 100644
--- a/src/wallet/feebumper.cpp
+++ b/src/wallet/feebumper.cpp
@@ -75,9 +75,11 @@ 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();
@@ -121,7 +123,6 @@ 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.
@@ -131,34 +132,17 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
walletIncrementalRelayFee = nodeIncrementalRelayFee;
}
- if (total_fee > 0) {
- 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;
- }
- new_fee = total_fee;
- nNewFeeRate = CFeeRate(total_fee, maxNewTxSize);
- } else {
- new_fee = GetMinimumFee(*wallet, maxNewTxSize, coin_control, 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
@@ -175,14 +159,14 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
// 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 = 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;
}
@@ -212,6 +196,109 @@ 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;
}