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rpc bumpfee: move feerate estimation logic into separate method

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ezegom 2019-07-29 17:43:43 -04:00 committed by Gregory Sanders
parent adff8fe321
commit 1a4c791cf4
1 changed files with 29 additions and 25 deletions
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54
src/wallet/feebumper.cpp
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@ -57,6 +57,34 @@ static feebumper::Result PreconditionChecks(interfaces::Chain::Lock& locked_chai
return feebumper::Result::OK;
}
static CFeeRate EstimateFeeRate(CWallet* wallet, const CWalletTx& wtx, CCoinControl& coin_control, CAmount& old_fee)
{
// 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));
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, coin_control, /* feeCalc */ nullptr));
// Set the required fee rate for the replacement transaction in coin control.
return std::max(feerate, min_feerate);
}
namespace feebumper {
bool TransactionCanBeBumped(const CWallet* wallet, const uint256& txid)
@ -230,31 +258,7 @@ Result CreateRateBumpTransaction(CWallet* wallet, const uint256& txid, const CCo
}
}
// 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);
new_coin_control.m_feerate = EstimateFeeRate(wallet, wtx, new_coin_control, old_fee);
// 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