RBFTransactionState IsRBFOptIn(const CTransaction &tx, CTxMemPool &pool) { AssertLockHeld(pool.cs); CTxMemPool::setEntries setAncestors; // First check the transaction itself. if (SignalsOptInRBF(tx)) { return RBF_TRANSACTIONSTATE_REPLACEABLE_BIP125; } // If this transaction is not in our mempool, then we can't be sure // we will know about all its inputs. if (!pool.exists(tx.GetHash())) { return RBF_TRANSACTIONSTATE_UNKNOWN; } // If all the inputs have nSequence >= maxint-1, it still might be // signaled for RBF if any unconfirmed parents have signaled. uint64_t noLimit = std::numeric_limits<uint64_t>::max(); std::string dummy; CTxMemPoolEntry entry = *pool.mapTx.find(tx.GetHash()); pool.CalculateMemPoolAncestors(entry, setAncestors, noLimit, noLimit, noLimit, noLimit, dummy, false); BOOST_FOREACH(CTxMemPool::txiter it, setAncestors) { if (SignalsOptInRBF(it->GetTx())) { return RBF_TRANSACTIONSTATE_REPLACEABLE_BIP125; } } return RBF_TRANSACTIONSTATE_FINAL; }
bool IsRBFOptIn(const CTxMemPoolEntry &entry, CTxMemPool &pool) { AssertLockHeld(pool.cs); CTxMemPool::setEntries setAncestors; // First check the transaction itself. if (SignalsOptInRBF(entry.GetTx())) { return true; } // If this transaction is not in our mempool, then we can't be sure // we will know about all its inputs. if (!pool.exists(entry.GetTx().GetHash())) { throw std::runtime_error("Cannot determine RBF opt-in signal for non-mempool transaction\n"); } // If all the inputs have nSequence >= maxint-1, it still might be // signaled for RBF if any unconfirmed parents have signaled. uint64_t noLimit = std::numeric_limits<uint64_t>::max(); std::string dummy; pool.CalculateMemPoolAncestors(entry, setAncestors, noLimit, noLimit, noLimit, noLimit, dummy, false); BOOST_FOREACH(CTxMemPool::txiter it, setAncestors) { if (SignalsOptInRBF(it->GetTx())) { return true; } } return false; }
CFeeBumper::CFeeBumper(const CWallet *pWallet, const uint256 txidIn, int newConfirmTarget, bool specifiedConfirmTarget, CAmount totalFee, bool newTxReplaceable) : txid(std::move(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 (!preconditionChecks(pWallet, wtx)) { 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(*wtx.tx, pWallet); 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 = CWallet::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 = CWallet::GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool, ::feeEstimator, true); } // otherwise use the regular wallet logic to select payTxFee or default confirm target else { nNewFee = CWallet::GetMinimumFee(maxNewTxSize, newConfirmTarget, mempool, ::feeEstimator); } 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 <= GetDustThreshold(*poutput, ::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 TransactionCanBeBumped(CWallet* wallet, const uint256& txid) { LOCK2(cs_main, wallet->cs_wallet); const CWalletTx* wtx = wallet->GetWalletTx(txid); return wtx && SignalsOptInRBF(*wtx->tx) && !wtx->mapValue.count("replaced_by_txid"); }
UniValue createrawtransaction(const JSONRPCRequest& request) { if (request.fHelp || request.params.size() < 2 || request.params.size() > 4) throw std::runtime_error( "createrawtransaction [{\"txid\":\"id\",\"vout\":n},...] {\"address\":amount,\"data\":\"hex\",...} ( locktime ) ( replaceable )\n" "\nCreate a transaction spending the given inputs and creating new outputs.\n" "Outputs can be addresses or data.\n" "Returns hex-encoded raw transaction.\n" "Note that the transaction's inputs are not signed, and\n" "it is not stored in the wallet or transmitted to the network.\n" "\nArguments:\n" "1. \"inputs\" (array, required) A json array of json objects\n" " [\n" " {\n" " \"txid\":\"id\", (string, required) The transaction id\n" " \"vout\":n, (numeric, required) The output number\n" " \"sequence\":n (numeric, optional) The sequence number\n" " } \n" " ,...\n" " ]\n" "2. \"outputs\" (object, required) a json object with outputs\n" " {\n" " \"address\": x.xxx, (numeric or string, required) The key is the bitcoin address, the numeric value (can be string) is the " + CURRENCY_UNIT + " amount\n" " \"data\": \"hex\" (string, required) The key is \"data\", the value is hex encoded data\n" " ,...\n" " }\n" "3. locktime (numeric, optional, default=0) Raw locktime. Non-0 value also locktime-activates inputs\n" "4. replaceable (boolean, optional, default=false) Marks this transaction as BIP125 replaceable.\n" " Allows this transaction to be replaced by a transaction with higher fees. If provided, it is an error if explicit sequence numbers are incompatible.\n" "\nResult:\n" "\"transaction\" (string) hex string of the transaction\n" "\nExamples:\n" + HelpExampleCli("createrawtransaction", "\"[{\\\"txid\\\":\\\"myid\\\",\\\"vout\\\":0}]\" \"{\\\"address\\\":0.01}\"") + HelpExampleCli("createrawtransaction", "\"[{\\\"txid\\\":\\\"myid\\\",\\\"vout\\\":0}]\" \"{\\\"data\\\":\\\"00010203\\\"}\"") + HelpExampleRpc("createrawtransaction", "\"[{\\\"txid\\\":\\\"myid\\\",\\\"vout\\\":0}]\", \"{\\\"address\\\":0.01}\"") + HelpExampleRpc("createrawtransaction", "\"[{\\\"txid\\\":\\\"myid\\\",\\\"vout\\\":0}]\", \"{\\\"data\\\":\\\"00010203\\\"}\"") ); RPCTypeCheck(request.params, {UniValue::VARR, UniValue::VOBJ, UniValue::VNUM}, true); if (request.params[0].isNull() || request.params[1].isNull()) throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, arguments 1 and 2 must be non-null"); UniValue inputs = request.params[0].get_array(); UniValue sendTo = request.params[1].get_obj(); CMutableTransaction rawTx; if (!request.params[2].isNull()) { int64_t nLockTime = request.params[2].get_int64(); if (nLockTime < 0 || nLockTime > std::numeric_limits<uint32_t>::max()) throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, locktime out of range"); rawTx.nLockTime = nLockTime; } bool rbfOptIn = request.params[3].isTrue(); for (unsigned int idx = 0; idx < inputs.size(); idx++) { const UniValue& input = inputs[idx]; const UniValue& o = input.get_obj(); uint256 txid = ParseHashO(o, "txid"); const UniValue& vout_v = find_value(o, "vout"); if (!vout_v.isNum()) throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, missing vout key"); int nOutput = vout_v.get_int(); if (nOutput < 0) throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout must be positive"); uint32_t nSequence; if (rbfOptIn) { nSequence = MAX_BIP125_RBF_SEQUENCE; } else if (rawTx.nLockTime) { nSequence = std::numeric_limits<uint32_t>::max() - 1; } else { nSequence = std::numeric_limits<uint32_t>::max(); } // set the sequence number if passed in the parameters object const UniValue& sequenceObj = find_value(o, "sequence"); if (sequenceObj.isNum()) { int64_t seqNr64 = sequenceObj.get_int64(); if (seqNr64 < 0 || seqNr64 > std::numeric_limits<uint32_t>::max()) { throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, sequence number is out of range"); } else { nSequence = (uint32_t)seqNr64; } } CTxIn in(COutPoint(txid, nOutput), CScript(), nSequence); rawTx.vin.push_back(in); } std::set<CTxDestination> destinations; std::vector<std::string> addrList = sendTo.getKeys(); for (const std::string& name_ : addrList) { if (name_ == "data") { std::vector<unsigned char> data = ParseHexV(sendTo[name_].getValStr(),"Data"); CTxOut out(0, CScript() << OP_RETURN << data); rawTx.vout.push_back(out); } else { CTxDestination destination = DecodeDestination(name_); if (!IsValidDestination(destination)) { throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string("Invalid Bitcoin address: ") + name_); } if (!destinations.insert(destination).second) { throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated address: ") + name_); } CScript scriptPubKey = GetScriptForDestination(destination); CAmount nAmount = AmountFromValue(sendTo[name_]); CTxOut out(nAmount, scriptPubKey); rawTx.vout.push_back(out); } } if (!request.params[3].isNull() && rbfOptIn != SignalsOptInRBF(rawTx)) { throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter combination: Sequence number(s) contradict replaceable option"); } return EncodeHexTx(rawTx); }