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Define dust transaction outputs, and make them non-standard

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This commit is contained in:
Gavin Andresen 2013-04-24 18:27:00 -04:00
parent b8e1dc2e53
commit 8de9bb53af
6 changed files with 74 additions and 27 deletions
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2
src/main.cpp
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@ -384,7 +384,7 @@ 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;

18
src/main.h
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@ -439,6 +439,24 @@ public:
return !(a == b);
}
size_t size() const
{
return sizeof(nValue)+scriptPubKey.size();
}
bool IsDust() const
{
// "Dust" is defined in terms of MIN_RELAY_TX_FEE, 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 32 bytes big, and will
// need a CTxIn of at least 148 bytes to spend,
// so dust is a txout less than 54 uBTC
// (5400 satoshis)
return ((nValue*1000)/(3*(size()+148)) < MIN_RELAY_TX_FEE);
}
std::string ToString() const
{
if (scriptPubKey.size() < 6)

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++)

25
src/wallet.cpp
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@ -1162,7 +1162,12 @@ 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())
return false;
wtxNew.vout.push_back(txout);
}
// Choose coins to use
set<pair<const CWalletTx*,unsigned int> > setCoins;
@ -1208,9 +1213,21 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
CScript scriptChange;
scriptChange.SetDestination(vchPubKey.GetID());
// 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));
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, newTxOut);
}
}
else
reservekey.ReturnKey();