diff options
| -rw-r--r-- | src/init.cpp | 15 | ||||
| -rw-r--r-- | src/wallet.cpp | 47 | ||||
| -rw-r--r-- | src/wallet.h | 5 |
3 files changed, 48 insertions, 19 deletions
diff --git a/src/init.cpp b/src/init.cpp index 11329c16aa..c5ced8654e 100644 --- a/src/init.cpp +++ b/src/init.cpp @@ -288,6 +288,7 @@ std::string HelpMessage(HelpMessageMode mode) strUsage += " -sendfreetransactions " + strprintf(_("Send transactions as zero-fee transactions if possible (default: %u)"), 0) + "\n"; strUsage += " -spendzeroconfchange " + strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), 1) + "\n"; strUsage += " -txconfirmtarget=<n> " + strprintf(_("If paytxfee is not set, include enough fee so transactions are confirmed on average within n blocks (default: %u)"), 1) + "\n"; + strUsage += " -maxtxfee=<amt> " + strprintf(_("Maximum total fees to use in a single wallet transaction, setting too low may abort large transactions (default: %s)"), FormatMoney(maxTxFee)) + "\n"; strUsage += " -upgradewallet " + _("Upgrade wallet to latest format") + " " + _("on startup") + "\n"; strUsage += " -wallet=<file> " + _("Specify wallet file (within data directory)") + " " + strprintf(_("(default: %s)"), "wallet.dat") + "\n"; strUsage += " -walletnotify=<cmd> " + _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)") + "\n"; @@ -697,6 +698,20 @@ bool AppInit2(boost::thread_group& threadGroup) mapArgs["-paytxfee"], ::minRelayTxFee.ToString())); } } + if (mapArgs.count("-maxtxfee")) + { + CAmount nMaxFee = 0; + if (!ParseMoney(mapArgs["-maxtxfee"], nMaxFee)) + return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s'"), mapArgs["-maptxfee"])); + if (nMaxFee > nHighTransactionMaxFeeWarning) + InitWarning(_("Warning: -maxtxfee is set very high! Fees this large could be paid on a single transaction.")); + maxTxFee = nMaxFee; + if (CFeeRate(maxTxFee, 1000) < ::minRelayTxFee) + { + return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"), + mapArgs["-maxtxfee"], ::minRelayTxFee.ToString())); + } + } nTxConfirmTarget = GetArg("-txconfirmtarget", 1); bSpendZeroConfChange = GetArg("-spendzeroconfchange", true); fSendFreeTransactions = GetArg("-sendfreetransactions", false); diff --git a/src/wallet.cpp b/src/wallet.cpp index 32a64daac0..dd87fab44b 100644 --- a/src/wallet.cpp +++ b/src/wallet.cpp @@ -26,6 +26,7 @@ using namespace std; * Settings */ CFeeRate payTxFee(DEFAULT_TRANSACTION_FEE); +CAmount maxTxFee = DEFAULT_TRANSACTION_MAXFEE; unsigned int nTxConfirmTarget = 1; bool bSpendZeroConfChange = true; bool fSendFreeTransactions = false; @@ -1499,27 +1500,32 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, CAmount> >& vecSend, } dPriority = wtxNew.ComputePriority(dPriority, nBytes); - CAmount nFeeNeeded = GetMinimumFee(nBytes, nTxConfirmTarget, mempool); + // Can we complete this as a free transaction? + if (fSendFreeTransactions && nBytes <= MAX_FREE_TRANSACTION_CREATE_SIZE) + { + // Not enough fee: enough priority? + double dPriorityNeeded = mempool.estimatePriority(nTxConfirmTarget); + // Not enough mempool history to estimate: use hard-coded AllowFree. + if (dPriorityNeeded <= 0 && AllowFree(dPriority)) + break; + + // Small enough, and priority high enough, to send for free + if (dPriorityNeeded > 0 && dPriority >= dPriorityNeeded) + break; + } - if (nFeeRet >= nFeeNeeded) - break; // Done, enough fee included. + CAmount nFeeNeeded = GetMinimumFee(nBytes, nTxConfirmTarget, mempool); - // Too big to send for free? Include more fee and try again: - if (!fSendFreeTransactions || nBytes > MAX_FREE_TRANSACTION_CREATE_SIZE) + // If we made it here and we aren't even able to meet the relay fee on the next pass, give up + // because we must be at the maximum allowed fee. + if (nFeeNeeded < ::minRelayTxFee.GetFee(nBytes)) { - nFeeRet = nFeeNeeded; - continue; + strFailReason = _("Transaction too large for fee policy"); + return false; } - // Not enough fee: enough priority? - double dPriorityNeeded = mempool.estimatePriority(nTxConfirmTarget); - // Not enough mempool history to estimate: use hard-coded AllowFree. - if (dPriorityNeeded <= 0 && AllowFree(dPriority)) - break; - - // Small enough, and priority high enough, to send for free - if (dPriorityNeeded > 0 && dPriority >= dPriorityNeeded) - break; + if (nFeeRet >= nFeeNeeded) + break; // Done, enough fee included. // Include more fee and try again. nFeeRet = nFeeNeeded; @@ -1591,9 +1597,6 @@ CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarge { // payTxFee is user-set "I want to pay this much" CAmount nFeeNeeded = payTxFee.GetFee(nTxBytes); - // prevent user from paying a non-sense fee (like 1 satoshi): 0 < fee < minRelayFee - if (nFeeNeeded > 0 && nFeeNeeded < ::minRelayTxFee.GetFee(nTxBytes)) - nFeeNeeded = ::minRelayTxFee.GetFee(nTxBytes); // user selected total at least (default=true) if (fPayAtLeastCustomFee && nFeeNeeded > 0 && nFeeNeeded < payTxFee.GetFeePerK()) nFeeNeeded = payTxFee.GetFeePerK(); @@ -1604,6 +1607,12 @@ CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarge // back to a hard-coded fee if (nFeeNeeded == 0) nFeeNeeded = minTxFee.GetFee(nTxBytes); + // prevent user from paying a non-sense fee (like 1 satoshi): 0 < fee < minRelayFee + if (nFeeNeeded < ::minRelayTxFee.GetFee(nTxBytes)) + nFeeNeeded = ::minRelayTxFee.GetFee(nTxBytes); + // But always obey the maximum + if (nFeeNeeded > maxTxFee) + nFeeNeeded = maxTxFee; return nFeeNeeded; } diff --git a/src/wallet.h b/src/wallet.h index 2dd2146e8c..058107edf1 100644 --- a/src/wallet.h +++ b/src/wallet.h @@ -30,6 +30,7 @@ * Settings */ extern CFeeRate payTxFee; +extern CAmount maxTxFee; extern unsigned int nTxConfirmTarget; extern bool bSpendZeroConfChange; extern bool fSendFreeTransactions; @@ -39,6 +40,10 @@ extern bool fPayAtLeastCustomFee; static const CAmount DEFAULT_TRANSACTION_FEE = 0; //! -paytxfee will warn if called with a higher fee than this amount (in satoshis) per KB static const CAmount nHighTransactionFeeWarning = 0.01 * COIN; +//! -maxtxfee default +static const CAmount DEFAULT_TRANSACTION_MAXFEE = 0.1 * COIN; +//! -maxtxfee will warn if called with a higher fee than this amount (in satoshis) +static const CAmount nHighTransactionMaxFeeWarning = 100 * nHighTransactionFeeWarning; //! Largest (in bytes) free transaction we're willing to create static const unsigned int MAX_FREE_TRANSACTION_CREATE_SIZE = 1000; |