kvazar
/
kevacoin
mirror of https://github.com/kvazar-network/kevacoin.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

[wallet] Refactor to use new MIN_CHANGE 

* Introduce new constant MIN_CHANGE and use it instead of the
hardcoded "CENT"
* Add test case for MIN_CHANGE
* Introduce new constant for -mintxfee default:
  DEFAULT_TRANSACTION_MINFEE = 1000
0.13
MarcoFalke 9 years ago
parent
0143a1f228
commit
6b0e622c25
4 changed files with 85 additions and 56 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 2
      src/qt/coincontroldialog.cpp
  2. 113
      src/wallet/test/wallet_tests.cpp
  3. 15
      src/wallet/wallet.cpp
  4. 11
      src/wallet/wallet.h

2
src/qt/coincontroldialog.cpp
Unescape View File

@ -567,7 +567,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog) @@ -567,7 +567,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
nChange -= nPayFee;
// Never create dust outputs; if we would, just add the dust to the fee.
if (nChange > 0 && nChange < CENT)
if (nChange > 0 && nChange < MIN_CHANGE)
{
CTxOut txout(nChange, (CScript)std::vector<unsigned char>(24, 0));
if (txout.IsDust(::minRelayTxFee))

113
src/wallet/test/wallet_tests.cpp
Unescape View File

@ -117,7 +117,7 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests) @@ -117,7 +117,7 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
// try making 34 cents from 1,2,5,10,20 - we can't do it exactly
BOOST_CHECK( wallet.SelectCoinsMinConf(34 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_GT(nValueRet, 34 * CENT); // but should get more than 34 cents
BOOST_CHECK_EQUAL(nValueRet, 35 * CENT); // but 35 cents is closest
BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U); // the best should be 20+10+5. it's incredibly unlikely the 1 or 2 got included (but possible)
// when we try making 7 cents, the smaller coins (1,2,5) are enough. We should see just 2+5
@ -185,33 +185,34 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests) @@ -185,33 +185,34 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
BOOST_CHECK_EQUAL(nValueRet, 2 * COIN); // we should get 2 BTC in 1 coin
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);
// empty the wallet and start again, now with fractions of a cent, to test sub-cent change avoidance
// empty the wallet and start again, now with fractions of a cent, to test small change avoidance
empty_wallet();
add_coin(0.1*CENT);
add_coin(0.2*CENT);
add_coin(0.3*CENT);
add_coin(0.4*CENT);
add_coin(0.5*CENT);
// try making 1 cent from 0.1 + 0.2 + 0.3 + 0.4 + 0.5 = 1.5 cents
// we'll get sub-cent change whatever happens, so can expect 1.0 exactly
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1 * CENT);
add_coin(0.1*MIN_CHANGE);
add_coin(0.2*MIN_CHANGE);
add_coin(0.3*MIN_CHANGE);
add_coin(0.4*MIN_CHANGE);
add_coin(0.5*MIN_CHANGE);
// try making 1 * MIN_CHANGE from the 1.5 * MIN_CHANGE
// we'll get change smaller than MIN_CHANGE whatever happens, so can expect MIN_CHANGE exactly
BOOST_CHECK( wallet.SelectCoinsMinConf(MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, MIN_CHANGE);
// but if we add a bigger coin, making it possible to avoid sub-cent change, things change:
add_coin(1111*CENT);
// but if we add a bigger coin, small change is avoided
add_coin(1111*MIN_CHANGE);
// try making 1 cent from 0.1 + 0.2 + 0.3 + 0.4 + 0.5 + 1111 = 1112.5 cents
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1 * CENT); // we should get the exact amount
// try making 1 from 0.1 + 0.2 + 0.3 + 0.4 + 0.5 + 1111 = 1112.5
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1 * MIN_CHANGE); // we should get the exact amount
// if we add more sub-cent coins:
add_coin(0.6*CENT);
add_coin(0.7*CENT);
// if we add more small coins:
add_coin(0.6*MIN_CHANGE);
add_coin(0.7*MIN_CHANGE);
// and try again to make 1.0 cents, we can still make 1.0 cents
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1 * CENT); // we should get the exact amount
// and try again to make 1.0 * MIN_CHANGE
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1 * MIN_CHANGE); // we should get the exact amount
// run the 'mtgox' test (see http://blockexplorer.com/tx/29a3efd3ef04f9153d47a990bd7b048a4b2d213daaa5fb8ed670fb85f13bdbcf)
// they tried to consolidate 10 50k coins into one 500k coin, and ended up with 50k in change
@ -223,45 +224,65 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests) @@ -223,45 +224,65 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
BOOST_CHECK_EQUAL(nValueRet, 500000 * COIN); // we should get the exact amount
BOOST_CHECK_EQUAL(setCoinsRet.size(), 10U); // in ten coins
// if there's not enough in the smaller coins to make at least 1 cent change (0.5+0.6+0.7 < 1.0+1.0),
// if there's not enough in the smaller coins to make at least 1 * MIN_CHANGE change (0.5+0.6+0.7 < 1.0+1.0),
// we need to try finding an exact subset anyway
// sometimes it will fail, and so we use the next biggest coin:
empty_wallet();
add_coin(0.5 * CENT);
add_coin(0.6 * CENT);
add_coin(0.7 * CENT);
add_coin(1111 * CENT);
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1111 * CENT); // we get the bigger coin
add_coin(0.5 * MIN_CHANGE);
add_coin(0.6 * MIN_CHANGE);
add_coin(0.7 * MIN_CHANGE);
add_coin(1111 * MIN_CHANGE);
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1111 * MIN_CHANGE); // we get the bigger coin
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);
// but sometimes it's possible, and we use an exact subset (0.4 + 0.6 = 1.0)
empty_wallet();
add_coin(0.4 * CENT);
add_coin(0.6 * CENT);
add_coin(0.8 * CENT);
add_coin(1111 * CENT);
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1 * CENT); // we should get the exact amount
add_coin(0.4 * MIN_CHANGE);
add_coin(0.6 * MIN_CHANGE);
add_coin(0.8 * MIN_CHANGE);
add_coin(1111 * MIN_CHANGE);
BOOST_CHECK( wallet.SelectCoinsMinConf(MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, MIN_CHANGE); // we should get the exact amount
BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U); // in two coins 0.4+0.6
// test avoiding sub-cent change
// test avoiding small change
empty_wallet();
add_coin(0.0005 * COIN);
add_coin(0.01 * COIN);
add_coin(1 * COIN);
add_coin(0.05 * MIN_CHANGE);
add_coin(1 * MIN_CHANGE);
add_coin(100 * MIN_CHANGE);
// trying to make 1.0001 from these three coins
BOOST_CHECK( wallet.SelectCoinsMinConf(1.0001 * COIN, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1.0105 * COIN); // we should get all coins
// trying to make 100.01 from these three coins
BOOST_CHECK( wallet.SelectCoinsMinConf(100.01 * MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 101.05 * MIN_CHANGE); // we should get all coins
BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U);
// but if we try to make 0.999, we should take the bigger of the two small coins to avoid sub-cent change
BOOST_CHECK( wallet.SelectCoinsMinConf(0.999 * COIN, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 1.01 * COIN); // we should get 1 + 0.01
// but if we try to make 99.9, we should take the bigger of the two small coins to avoid small change
BOOST_CHECK( wallet.SelectCoinsMinConf(99.9 * MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
BOOST_CHECK_EQUAL(nValueRet, 101 * MIN_CHANGE);
BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U);
// test with many inputs
for (CAmount amt=1500; amt < COIN; amt*=10) {
empty_wallet();
// Create 676 inputs (= MAX_STANDARD_TX_SIZE / 148 bytes per input)
for (uint16_t j = 0; j < 676; j++)
add_coin(amt);
BOOST_CHECK(wallet.SelectCoinsMinConf(2000, 1, 1, vCoins, setCoinsRet, nValueRet));
if (amt - 2000 < MIN_CHANGE) {
// needs more than one input:
uint16_t returnSize = std::ceil((2000.0 + MIN_CHANGE)/amt);
CAmount returnValue = amt * returnSize;
BOOST_CHECK_EQUAL(nValueRet, returnValue);
BOOST_CHECK_EQUAL(setCoinsRet.size(), returnSize);
} else {
// one input is sufficient:
BOOST_CHECK_EQUAL(nValueRet, amt);
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);
}
}
// test randomness
{
empty_wallet();

15
src/wallet/wallet.cpp
Unescape View File

@ -47,7 +47,7 @@ bool fPayAtLeastCustomFee = true; @@ -47,7 +47,7 @@ bool fPayAtLeastCustomFee = true;
* Fees smaller than this (in satoshi) are considered zero fee (for transaction creation)
* Override with -mintxfee
*/
CFeeRate CWallet::minTxFee = CFeeRate(1000);
CFeeRate CWallet::minTxFee = CFeeRate(DEFAULT_TRANSACTION_MINFEE);
/** @defgroup mapWallet
*
@ -1498,9 +1498,6 @@ CAmount CWallet::GetImmatureWatchOnlyBalance() const @@ -1498,9 +1498,6 @@ CAmount CWallet::GetImmatureWatchOnlyBalance() const
return nTotal;
}
/**
* populate vCoins with vector of available COutputs.
*/
void CWallet::AvailableCoins(vector<COutput>& vCoins, bool fOnlyConfirmed, const CCoinControl *coinControl, bool fIncludeZeroValue) const
{
vCoins.clear();
@ -1620,7 +1617,7 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, int nConfMine, int @@ -1620,7 +1617,7 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, int nConfMine, int
nValueRet += coin.first;
return true;
}
else if (n < nTargetValue + CENT)
else if (n < nTargetValue + MIN_CHANGE)
{
vValue.push_back(coin);
nTotalLower += n;
@ -1655,14 +1652,14 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, int nConfMine, int @@ -1655,14 +1652,14 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, int nConfMine, int
vector<char> vfBest;
CAmount nBest;
ApproximateBestSubset(vValue, nTotalLower, nTargetValue, vfBest, nBest, 1000);
if (nBest != nTargetValue && nTotalLower >= nTargetValue + CENT)
ApproximateBestSubset(vValue, nTotalLower, nTargetValue + CENT, vfBest, nBest, 1000);
ApproximateBestSubset(vValue, nTotalLower, nTargetValue, vfBest, nBest);
if (nBest != nTargetValue && nTotalLower >= nTargetValue + MIN_CHANGE)
ApproximateBestSubset(vValue, nTotalLower, nTargetValue + MIN_CHANGE, vfBest, nBest);
// If we have a bigger coin and (either the stochastic approximation didn't find a good solution,
// or the next bigger coin is closer), return the bigger coin
if (coinLowestLarger.second.first &&
((nBest != nTargetValue && nBest < nTargetValue + CENT) || coinLowestLarger.first <= nBest))
((nBest != nTargetValue && nBest < nTargetValue + MIN_CHANGE) || coinLowestLarger.first <= nBest))
{
setCoinsRet.insert(coinLowestLarger.second);
nValueRet += coinLowestLarger.first;

11
src/wallet/wallet.h
Unescape View File

@ -41,8 +41,12 @@ extern bool fPayAtLeastCustomFee; @@ -41,8 +41,12 @@ 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;
//! -mintxfee default
static const CAmount DEFAULT_TRANSACTION_MINFEE = 1000;
//! -maxtxfee default
static const CAmount DEFAULT_TRANSACTION_MAXFEE = 0.1 * COIN;
//! minimum change amount
static const CAmount MIN_CHANGE = CENT;
//! -txconfirmtarget default
static const unsigned int DEFAULT_TX_CONFIRM_TARGET = 2;
//! -maxtxfee will warn if called with a higher fee than this amount (in satoshis)
@ -544,7 +548,14 @@ public: @@ -544,7 +548,14 @@ public:
//! check whether we are allowed to upgrade (or already support) to the named feature
bool CanSupportFeature(enum WalletFeature wf) { AssertLockHeld(cs_wallet); return nWalletMaxVersion >= wf; }
/**
* populate vCoins with vector of available COutputs.
*/
void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlyConfirmed=true, const CCoinControl *coinControl = NULL, bool fIncludeZeroValue=false) const;
/**
* Select coins until nTargetValue is reached. Return the actual value
* and the corresponding coin set.
*/
bool SelectCoinsMinConf(const CAmount& nTargetValue, int nConfMine, int nConfTheirs, std::vector<COutput> vCoins, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, CAmount& nValueRet) const;
bool IsSpent(const uint256& hash, unsigned int n) const;

Write Preview
Loading…
Cancel
Save