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Merge pull request #2577 from gavinandresen/fee_bandaid

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Treat dust outputs as non-standard, un-hardcode TX_FEE constants
This commit is contained in:
Gavin Andresen 2013-05-04 10:15:39 -07:00
commit 33edd0a477
11 changed files with 147 additions and 67 deletions
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22
src/init.cpp
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@ -582,6 +582,28 @@ bool AppInit2(boost::thread_group& threadGroup)
const char* pszP2SH = "/P2SH/";
COINBASE_FLAGS << std::vector<unsigned char>(pszP2SH, pszP2SH+strlen(pszP2SH));
// Fee-per-kilobyte amount considered the same as "free"
// If you are mining, be careful setting this:
// if you set it to zero then
// a transaction spammer can cheaply fill blocks using
// 1-satoshi-fee transactions. It should be set above the real
// cost to you of processing a transaction.
if (mapArgs.count("-mintxfee"))
{
int64 n = 0;
if (ParseMoney(mapArgs["-mintxfee"], n) && n > 0)
CTransaction::nMinTxFee = n;
else
return InitError(strprintf(_("Invalid amount for -mintxfee=<amount>: '%s'"), mapArgs["-mintxfee"].c_str()));
}
if (mapArgs.count("-minrelaytxfee"))
{
int64 n = 0;
if (ParseMoney(mapArgs["-minrelaytxfee"], n) && n > 0)
CTransaction::nMinRelayTxFee = n;
else
return InitError(strprintf(_("Invalid amount for -minrelaytxfee=<amount>: '%s'"), mapArgs["-minrelaytxfee"].c_str()));
}
if (mapArgs.count("-paytxfee"))
{

41
src/main.cpp
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@ -48,6 +48,11 @@ bool fBenchmark = false;
bool fTxIndex = false;
unsigned int nCoinCacheSize = 5000;
/** Fees smaller than this (in satoshi) are considered zero fee (for transaction creation) */
int64 CTransaction::nMinTxFee = 10000; // Override with -mintxfee
/** Fees smaller than this (in satoshi) are considered zero fee (for relaying) */
int64 CTransaction::nMinRelayTxFee = 10000;
CMedianFilter<int> cPeerBlockCounts(8, 0); // Amount of blocks that other nodes claim to have
map<uint256, CBlock*> mapOrphanBlocks;
@ -352,9 +357,22 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
//////////////////////////////////////////////////////////////////////////////
//
// CTransaction
// CTransaction / CTxOut
//
bool CTxOut::IsDust() const
{
// "Dust" is defined in terms of CTransaction::nMinRelayTxFee,
// which has units satoshis-per-kilobyte.
// If you'd pay more than 1/3 in fees
// to spend something, then we consider it dust.
// A typical txout is 33 bytes big, and will
// need a CTxIn of at least 148 bytes to spend,
// so dust is a txout less than 54 uBTC
// (5430 satoshis) with default nMinRelayTxFee
return ((nValue*1000)/(3*((int)GetSerializeSize(SER_DISK,0)+148)) < CTransaction::nMinRelayTxFee);
}
bool CTransaction::IsStandard() const
{
if (nVersion > CTransaction::CURRENT_VERSION)
@ -384,7 +402,7 @@ bool CTransaction::IsStandard() const
BOOST_FOREACH(const CTxOut& txout, vout) {
if (!::IsStandard(txout.scriptPubKey))
return false;
if (txout.nValue == 0)
if (txout.IsDust())
return false;
}
return true;
@ -574,8 +592,8 @@ bool CTransaction::CheckTransaction(CValidationState &state) const
int64 CTransaction::GetMinFee(unsigned int nBlockSize, bool fAllowFree,
enum GetMinFee_mode mode) const
{
// Base fee is either MIN_TX_FEE or MIN_RELAY_TX_FEE
int64 nBaseFee = (mode == GMF_RELAY) ? MIN_RELAY_TX_FEE : MIN_TX_FEE;
// Base fee is either nMinTxFee or nMinRelayTxFee
int64 nBaseFee = (mode == GMF_RELAY) ? nMinRelayTxFee : nMinTxFee;
unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION);
unsigned int nNewBlockSize = nBlockSize + nBytes;
@ -598,7 +616,7 @@ int64 CTransaction::GetMinFee(unsigned int nBlockSize, bool fAllowFree,
}
}
// To limit dust spam, require MIN_TX_FEE/MIN_RELAY_TX_FEE if any output is less than 0.01
// To limit dust spam, require base fee if any output is less than 0.01
if (nMinFee < nBaseFee)
{
BOOST_FOREACH(const CTxOut& txout, vout)
@ -746,7 +764,7 @@ bool CTxMemPool::accept(CValidationState &state, CTransaction &tx, bool fCheckIn
// Continuously rate-limit free transactions
// This mitigates 'penny-flooding' -- sending thousands of free transactions just to
// be annoying or make others' transactions take longer to confirm.
if (fLimitFree && nFees < MIN_RELAY_TX_FEE)
if (fLimitFree && nFees < CTransaction::nMinRelayTxFee)
{
static double dFreeCount;
static int64 nLastTime;
@ -4187,15 +4205,6 @@ CBlockTemplate* CreateNewBlock(CReserveKey& reservekey)
unsigned int nBlockMinSize = GetArg("-blockminsize", 0);
nBlockMinSize = std::min(nBlockMaxSize, nBlockMinSize);
// Fee-per-kilobyte amount considered the same as "free"
// Be careful setting this: if you set it to zero then
// a transaction spammer can cheaply fill blocks using
// 1-satoshi-fee transactions. It should be set above the real
// cost to you of processing a transaction.
int64 nMinTxFee = MIN_TX_FEE;
if (mapArgs.count("-mintxfee"))
ParseMoney(mapArgs["-mintxfee"], nMinTxFee);
// Collect memory pool transactions into the block
int64 nFees = 0;
{
@ -4313,7 +4322,7 @@ CBlockTemplate* CreateNewBlock(CReserveKey& reservekey)
continue;
// Skip free transactions if we're past the minimum block size:
if (fSortedByFee && (dFeePerKb < nMinTxFee) && (nBlockSize + nTxSize >= nBlockMinSize))
if (fSortedByFee && (dFeePerKb < CTransaction::nMinTxFee) && (nBlockSize + nTxSize >= nBlockMinSize))
continue;
// Prioritize by fee once past the priority size or we run out of high-priority

8
src/main.h
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@ -44,10 +44,6 @@ static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
/** Fake height value used in CCoins to signify they are only in the memory pool (since 0.8) */
static const unsigned int MEMPOOL_HEIGHT = 0x7FFFFFFF;
/** Fees smaller than this (in satoshi) are considered zero fee (for transaction creation) */
static const int64 MIN_TX_FEE = 10000;
/** Fees smaller than this (in satoshi) are considered zero fee (for relaying) */
static const int64 MIN_RELAY_TX_FEE = 10000;
/** No amount larger than this (in satoshi) is valid */
static const int64 MAX_MONEY = 21000000 * COIN;
inline bool MoneyRange(int64 nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
@ -439,6 +435,8 @@ public:
return !(a == b);
}
bool IsDust() const;
std::string ToString() const
{
if (scriptPubKey.size() < 6)
@ -467,6 +465,8 @@ enum GetMinFee_mode
class CTransaction
{
public:
static int64 nMinTxFee;
static int64 nMinRelayTxFee;
static const int CURRENT_VERSION=1;
int nVersion;
std::vector<CTxIn> vin;

2
src/qt/bitcoin.cpp
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@ -73,7 +73,7 @@ static bool ThreadSafeAskFee(int64 nFeeRequired)
{
if(!guiref)
return false;
if(nFeeRequired < MIN_TX_FEE || nFeeRequired <= nTransactionFee || fDaemon)
if(nFeeRequired < CTransaction::nMinTxFee || nFeeRequired <= nTransactionFee || fDaemon)
return true;
bool payFee = false;

5
src/qt/walletmodel.cpp
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@ -181,7 +181,8 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipie
CWalletTx wtx;
CReserveKey keyChange(wallet);
int64 nFeeRequired = 0;
bool fCreated = wallet->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired);
std::string strFailReason;
bool fCreated = wallet->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired, strFailReason);
if(!fCreated)
{
@ -189,6 +190,8 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipie
{
return SendCoinsReturn(AmountWithFeeExceedsBalance, nFeeRequired);
}
emit message(tr("Send Coins"), QString::fromStdString(strFailReason),
CClientUIInterface::MSG_ERROR);
return TransactionCreationFailed;
}
if(!uiInterface.ThreadSafeAskFee(nFeeRequired))

9
src/rpcwallet.cpp
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@ -694,13 +694,10 @@ Value sendmany(const Array& params, bool fHelp)
// Send
CReserveKey keyChange(pwalletMain);
int64 nFeeRequired = 0;
bool fCreated = pwalletMain->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired);
string strFailReason;
bool fCreated = pwalletMain->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired, strFailReason);
if (!fCreated)
{
if (totalAmount + nFeeRequired > pwalletMain->GetBalance())
throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, "Insufficient funds");
throw JSONRPCError(RPC_WALLET_ERROR, "Transaction creation failed");
}
throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, strFailReason);
if (!pwalletMain->CommitTransaction(wtx, keyChange))
throw JSONRPCError(RPC_WALLET_ERROR, "Transaction commit failed");

5
src/test/script_P2SH_tests.cpp
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@ -78,7 +78,9 @@ BOOST_AUTO_TEST_CASE(sign)
for (int i = 0; i < 4; i++)
{
txFrom.vout[i].scriptPubKey = evalScripts[i];
txFrom.vout[i].nValue = COIN;
txFrom.vout[i+4].scriptPubKey = standardScripts[i];
txFrom.vout[i+4].nValue = COIN;
}
BOOST_CHECK(txFrom.IsStandard());
@ -169,6 +171,7 @@ BOOST_AUTO_TEST_CASE(set)
for (int i = 0; i < 4; i++)
{
txFrom.vout[i].scriptPubKey = outer[i];
txFrom.vout[i].nValue = CENT;
}
BOOST_CHECK(txFrom.IsStandard());
@ -179,7 +182,7 @@ BOOST_AUTO_TEST_CASE(set)
txTo[i].vout.resize(1);
txTo[i].vin[0].prevout.n = i;
txTo[i].vin[0].prevout.hash = txFrom.GetHash();
txTo[i].vout[0].nValue = 1;
txTo[i].vout[0].nValue = 1*CENT;
txTo[i].vout[0].scriptPubKey = inner[i];
BOOST_CHECK_MESSAGE(IsMine(keystore, txFrom.vout[i].scriptPubKey), strprintf("IsMine %d", i));
}

34
src/test/transaction_tests.cpp
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@ -242,24 +242,34 @@ BOOST_AUTO_TEST_CASE(test_Get)
BOOST_CHECK(!t1.AreInputsStandard(coins));
}
BOOST_AUTO_TEST_CASE(test_GetThrow)
BOOST_AUTO_TEST_CASE(test_IsStandard)
{
CBasicKeyStore keystore;
CCoinsView coinsDummy;
CCoinsViewCache coins(coinsDummy);
std::vector<CTransaction> dummyTransactions = SetupDummyInputs(keystore, coins);
CTransaction t1;
t1.vin.resize(3);
t1.vin[0].prevout.hash = dummyTransactions[0].GetHash();
t1.vin[0].prevout.n = 0;
t1.vin[1].prevout.hash = dummyTransactions[1].GetHash();;
t1.vin[1].prevout.n = 0;
t1.vin[2].prevout.hash = dummyTransactions[1].GetHash();;
t1.vin[2].prevout.n = 1;
t1.vout.resize(2);
t1.vout[0].nValue = 90*CENT;
t1.vout[0].scriptPubKey << OP_1;
CTransaction t;
t.vin.resize(1);
t.vin[0].prevout.hash = dummyTransactions[0].GetHash();
t.vin[0].prevout.n = 1;
t.vin[0].scriptSig << std::vector<unsigned char>(65, 0);
t.vout.resize(1);
t.vout[0].nValue = 90*CENT;
CKey key;
key.MakeNewKey(true);
t.vout[0].scriptPubKey.SetDestination(key.GetPubKey().GetID());
BOOST_CHECK(t.IsStandard());
t.vout[0].nValue = 5011; // dust
BOOST_CHECK(!t.IsStandard());
t.vout[0].nValue = 6011; // not dust
BOOST_CHECK(t.IsStandard());
t.vout[0].scriptPubKey = CScript() << OP_1;
BOOST_CHECK(!t.IsStandard());
}
BOOST_AUTO_TEST_SUITE_END()

17
src/test/wallet_tests.cpp
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@ -21,13 +21,12 @@ static vector<COutput> vCoins;
static void add_coin(int64 nValue, int nAge = 6*24, bool fIsFromMe = false, int nInput=0)
{
static int i;
CTransaction* tx = new CTransaction;
tx->nLockTime = i++; // so all transactions get different hashes
tx->vout.resize(nInput+1);
tx->vout[nInput].nValue = nValue;
CWalletTx* wtx = new CWalletTx(&wallet, *tx);
delete tx;
static int nextLockTime = 0;
CTransaction tx;
tx.nLockTime = nextLockTime++; // so all transactions get different hashes
tx.vout.resize(nInput+1);
tx.vout[nInput].nValue = nValue;
CWalletTx* wtx = new CWalletTx(&wallet, tx);
if (fIsFromMe)
{
// IsFromMe() returns (GetDebit() > 0), and GetDebit() is 0 if vin.empty(),
@ -55,8 +54,8 @@ static bool equal_sets(CoinSet a, CoinSet b)
BOOST_AUTO_TEST_CASE(coin_selection_tests)
{
static CoinSet setCoinsRet, setCoinsRet2;
static int64 nValueRet;
CoinSet setCoinsRet, setCoinsRet2;
int64 nValueRet;
// test multiple times to allow for differences in the shuffle order
for (int i = 0; i < RUN_TESTS; i++)

61
src/wallet.cpp
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@ -1141,17 +1141,24 @@ bool CWallet::SelectCoins(int64 nTargetValue, set<pair<const CWalletTx*,unsigned
bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet)
bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend,
CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string& strFailReason)
{
int64 nValue = 0;
BOOST_FOREACH (const PAIRTYPE(CScript, int64)& s, vecSend)
{
if (nValue < 0)
{
strFailReason = _("Transaction amounts must be positive");
return false;
}
nValue += s.second;
}
if (vecSend.empty() || nValue < 0)
{
strFailReason = _("Transaction amounts must be positive");
return false;
}
wtxNew.BindWallet(this);
@ -1169,13 +1176,24 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
double dPriority = 0;
// vouts to the payees
BOOST_FOREACH (const PAIRTYPE(CScript, int64)& s, vecSend)
wtxNew.vout.push_back(CTxOut(s.second, s.first));
{
CTxOut txout(s.second, s.first);
if (txout.IsDust())
{
strFailReason = _("Transaction amount too small");
return false;
}
wtxNew.vout.push_back(txout);
}
// Choose coins to use
set<pair<const CWalletTx*,unsigned int> > setCoins;
int64 nValueIn = 0;
if (!SelectCoins(nTotalValue, setCoins, nValueIn))
{
strFailReason = _("Insufficient funds");
return false;
}
BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
{
int64 nCredit = pcoin.first->vout[pcoin.second].nValue;
@ -1186,12 +1204,12 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
}
int64 nChange = nValueIn - nValue - nFeeRet;
// if sub-cent change is required, the fee must be raised to at least MIN_TX_FEE
// if sub-cent change is required, the fee must be raised to at least nMinTxFee
// or until nChange becomes zero
// NOTE: this depends on the exact behaviour of GetMinFee
if (nFeeRet < MIN_TX_FEE && nChange > 0 && nChange < CENT)
if (nFeeRet < CTransaction::nMinTxFee && nChange > 0 && nChange < CENT)
{
int64 nMoveToFee = min(nChange, MIN_TX_FEE - nFeeRet);
int64 nMoveToFee = min(nChange, CTransaction::nMinTxFee - nFeeRet);
nChange -= nMoveToFee;
nFeeRet += nMoveToFee;
}
@ -1215,9 +1233,21 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
CScript scriptChange;
scriptChange.SetDestination(vchPubKey.GetID());
CTxOut newTxOut(nChange, scriptChange);
// Never create dust outputs; if we would, just
// add the dust to the fee.
if (newTxOut.IsDust())
{
nFeeRet += nChange;
reservekey.ReturnKey();
}
else
{
// Insert change txn at random position:
vector<CTxOut>::iterator position = wtxNew.vout.begin()+GetRandInt(wtxNew.vout.size()+1);
wtxNew.vout.insert(position, CTxOut(nChange, scriptChange));
wtxNew.vout.insert(position, newTxOut);
}
}
else
reservekey.ReturnKey();
@ -1230,12 +1260,18 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
int nIn = 0;
BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
if (!SignSignature(*this, *coin.first, wtxNew, nIn++))
{
strFailReason = _("Signing transaction failed");
return false;
}
// Limit size
unsigned int nBytes = ::GetSerializeSize(*(CTransaction*)&wtxNew, SER_NETWORK, PROTOCOL_VERSION);
if (nBytes >= MAX_STANDARD_TX_SIZE)
{
strFailReason = _("Transaction too large");
return false;
}
dPriority /= nBytes;
// Check that enough fee is included
@ -1259,11 +1295,12 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
return true;
}
bool CWallet::CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet)
bool CWallet::CreateTransaction(CScript scriptPubKey, int64 nValue,
CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string& strFailReason)
{
vector< pair<CScript, int64> > vecSend;
vecSend.push_back(make_pair(scriptPubKey, nValue));
return CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet);
return CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet, strFailReason);
}
// Call after CreateTransaction unless you want to abort
@ -1329,14 +1366,12 @@ string CWallet::SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew,
printf("SendMoney() : %s", strError.c_str());
return strError;
}
if (!CreateTransaction(scriptPubKey, nValue, wtxNew, reservekey, nFeeRequired))
{
string strError;
if (!CreateTransaction(scriptPubKey, nValue, wtxNew, reservekey, nFeeRequired, strError))
{
if (nValue + nFeeRequired > GetBalance())
strError = strprintf(_("Error: This transaction requires a transaction fee of at least %s because of its amount, complexity, or use of recently received funds!"), FormatMoney(nFeeRequired).c_str());
else
strError = _("Error: Transaction creation failed!");
printf("SendMoney() : %s", strError.c_str());
printf("SendMoney() : %s\n", strError.c_str());
return strError;
}

6
src/wallet.h
View File

@ -178,8 +178,10 @@ public:
int64 GetBalance() const;
int64 GetUnconfirmedBalance() const;
int64 GetImmatureBalance() const;
bool CreateTransaction(const std::vector<std::pair<CScript, int64> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
bool CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
bool CreateTransaction(const std::vector<std::pair<CScript, int64> >& vecSend,
CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string& strFailReason);
bool CreateTransaction(CScript scriptPubKey, int64 nValue,
CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string& strFailReason);
bool CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey);
std::string SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);
std::string SendMoneyToDestination(const CTxDestination &address, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);