Branch data Line data Source code
1 : : // Copyright (c) 2017-2022 The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #include <consensus/amount.h>
6 : : #include <node/context.h>
7 : : #include <policy/policy.h>
8 : : #include <primitives/transaction.h>
9 : : #include <random.h>
10 : : #include <test/util/setup_common.h>
11 : : #include <util/translation.h>
12 : : #include <wallet/coincontrol.h>
13 : : #include <wallet/coinselection.h>
14 : : #include <wallet/spend.h>
15 : : #include <wallet/test/util.h>
16 : : #include <wallet/test/wallet_test_fixture.h>
17 : : #include <wallet/wallet.h>
18 : :
19 : : #include <algorithm>
20 : : #include <boost/test/unit_test.hpp>
21 : : #include <random>
22 : :
23 : : namespace wallet {
24 : : BOOST_FIXTURE_TEST_SUITE(coinselector_tests, WalletTestingSetup)
25 : :
26 : : // how many times to run all the tests to have a chance to catch errors that only show up with particular random shuffles
27 : : #define RUN_TESTS 100
28 : :
29 : : // some tests fail 1% of the time due to bad luck.
30 : : // we repeat those tests this many times and only complain if all iterations of the test fail
31 : : #define RANDOM_REPEATS 5
32 : :
33 : : typedef std::set<std::shared_ptr<COutput>> CoinSet;
34 : :
35 : : static const CoinEligibilityFilter filter_standard(1, 6, 0);
36 : : static const CoinEligibilityFilter filter_confirmed(1, 1, 0);
37 : : static const CoinEligibilityFilter filter_standard_extra(6, 6, 0);
38 : : static int nextLockTime = 0;
39 : :
40 : 50088 : static void add_coin(const CAmount& nValue, int nInput, std::vector<COutput>& set)
41 : : {
42 : 50088 : CMutableTransaction tx;
43 [ + - ]: 50088 : tx.vout.resize(nInput + 1);
44 [ + - ]: 50088 : tx.vout[nInput].nValue = nValue;
45 : 50088 : tx.nLockTime = nextLockTime++; // so all transactions get different hashes
46 [ + - + - : 50088 : set.emplace_back(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 1, /*input_bytes=*/ -1, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, /*fees=*/ 0);
+ - ]
47 : 50088 : }
48 : :
49 : 33 : static void add_coin(const CAmount& nValue, int nInput, SelectionResult& result)
50 : : {
51 : 33 : CMutableTransaction tx;
52 [ + - ]: 33 : tx.vout.resize(nInput + 1);
53 [ + - ]: 33 : tx.vout[nInput].nValue = nValue;
54 : 33 : tx.nLockTime = nextLockTime++; // so all transactions get different hashes
55 [ + - + - : 33 : COutput output(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 1, /*input_bytes=*/ -1, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, /*fees=*/ 0);
+ - ]
56 [ + - ]: 33 : OutputGroup group;
57 [ + - + - ]: 33 : group.Insert(std::make_shared<COutput>(output), /*ancestors=*/ 0, /*descendants=*/ 0);
58 [ + - ]: 33 : result.AddInput(group);
59 : 66 : }
60 : :
61 : 28 : static void add_coin(const CAmount& nValue, int nInput, SelectionResult& result, CAmount fee, CAmount long_term_fee)
62 : : {
63 : 28 : CMutableTransaction tx;
64 [ + - ]: 28 : tx.vout.resize(nInput + 1);
65 [ + - ]: 28 : tx.vout[nInput].nValue = nValue;
66 : 28 : tx.nLockTime = nextLockTime++; // so all transactions get different hashes
67 [ + - + - : 28 : std::shared_ptr<COutput> coin = std::make_shared<COutput>(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 1, /*input_bytes=*/ 148, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, fee);
+ - ]
68 [ + - ]: 28 : OutputGroup group;
69 [ + - ]: 28 : group.Insert(coin, /*ancestors=*/ 0, /*descendants=*/ 0);
70 [ + - ]: 28 : coin->long_term_fee = long_term_fee; // group.Insert() will modify long_term_fee, so we need to set it afterwards
71 [ + - ]: 28 : result.AddInput(group);
72 [ + - ]: 84 : }
73 : :
74 : 116197 : static void add_coin(CoinsResult& available_coins, CWallet& wallet, const CAmount& nValue, CFeeRate feerate = CFeeRate(0), int nAge = 6*24, bool fIsFromMe = false, int nInput =0, bool spendable = false, int custom_size = 0)
75 : : {
76 : 116197 : CMutableTransaction tx;
77 : 116197 : tx.nLockTime = nextLockTime++; // so all transactions get different hashes
78 [ + - ]: 116197 : tx.vout.resize(nInput + 1);
79 [ + + ]: 116197 : tx.vout[nInput].nValue = nValue;
80 [ + + ]: 116197 : if (spendable) {
81 [ + - + - : 6158 : tx.vout[nInput].scriptPubKey = GetScriptForDestination(*Assert(wallet.GetNewDestination(OutputType::BECH32, "")));
+ - + - ]
82 : : }
83 [ + - ]: 116197 : uint256 txid = tx.GetHash();
84 : :
85 [ + - ]: 116197 : LOCK(wallet.cs_wallet);
86 [ + - + - : 232394 : auto ret = wallet.mapWallet.emplace(std::piecewise_construct, std::forward_as_tuple(txid), std::forward_as_tuple(MakeTransactionRef(std::move(tx)), TxStateInactive{}));
- + ]
87 [ - + ]: 116197 : assert(ret.second);
88 [ + - ]: 116197 : CWalletTx& wtx = (*ret.first).second;
89 [ + - ]: 116197 : const auto& txout = wtx.tx->vout.at(nInput);
90 [ + + + - : 232394 : available_coins.Add(OutputType::BECH32, {COutPoint(wtx.GetHash(), nInput), txout, nAge, custom_size == 0 ? CalculateMaximumSignedInputSize(txout, &wallet, /*coin_control=*/nullptr) : custom_size, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, wtx.GetTxTime(), fIsFromMe, feerate});
+ - + - +
- + - ]
91 : 232394 : }
92 : :
93 : : // Helpers
94 : 5601 : std::optional<SelectionResult> KnapsackSolver(std::vector<OutputGroup>& groups, const CAmount& nTargetValue,
95 : : CAmount change_target, FastRandomContext& rng)
96 : : {
97 : 5601 : auto res{KnapsackSolver(groups, nTargetValue, change_target, rng, MAX_STANDARD_TX_WEIGHT)};
98 [ + + + - ]: 10602 : return res ? std::optional<SelectionResult>(*res) : std::nullopt;
99 : 5601 : }
100 : :
101 : 115 : std::optional<SelectionResult> SelectCoinsBnB(std::vector<OutputGroup>& utxo_pool, const CAmount& selection_target, const CAmount& cost_of_change)
102 : : {
103 : 115 : auto res{SelectCoinsBnB(utxo_pool, selection_target, cost_of_change, MAX_STANDARD_TX_WEIGHT)};
104 [ + + + - ]: 124 : return res ? std::optional<SelectionResult>(*res) : std::nullopt;
105 : 115 : }
106 : :
107 : : /** Check if SelectionResult a is equivalent to SelectionResult b.
108 : : * Equivalent means same input values, but maybe different inputs (i.e. same value, different prevout) */
109 : 14 : static bool EquivalentResult(const SelectionResult& a, const SelectionResult& b)
110 : : {
111 : 14 : std::vector<CAmount> a_amts;
112 : 14 : std::vector<CAmount> b_amts;
113 [ + - + + ]: 47 : for (const auto& coin : a.GetInputSet()) {
114 [ + - ]: 33 : a_amts.push_back(coin->txout.nValue);
115 : : }
116 [ + - + + ]: 47 : for (const auto& coin : b.GetInputSet()) {
117 [ + - ]: 33 : b_amts.push_back(coin->txout.nValue);
118 : : }
119 : 14 : std::sort(a_amts.begin(), a_amts.end());
120 : 14 : std::sort(b_amts.begin(), b_amts.end());
121 : :
122 : 14 : std::pair<std::vector<CAmount>::iterator, std::vector<CAmount>::iterator> ret = std::mismatch(a_amts.begin(), a_amts.end(), b_amts.begin());
123 [ + - - + ]: 14 : return ret.first == a_amts.end() && ret.second == b_amts.end();
124 : 14 : }
125 : :
126 : : /** Check if this selection is equal to another one. Equal means same inputs (i.e same value and prevout) */
127 : 1100 : static bool EqualResult(const SelectionResult& a, const SelectionResult& b)
128 : : {
129 : 1100 : std::pair<CoinSet::iterator, CoinSet::iterator> ret = std::mismatch(a.GetInputSet().begin(), a.GetInputSet().end(), b.GetInputSet().begin(),
130 : 1102 : [](const std::shared_ptr<COutput>& a, const std::shared_ptr<COutput>& b) {
131 [ + + ]: 1102 : return a->outpoint == b->outpoint;
132 : : });
133 [ + + - + ]: 1100 : return ret.first == a.GetInputSet().end() && ret.second == b.GetInputSet().end();
134 : : }
135 : :
136 : 2 : static CAmount make_hard_case(int utxos, std::vector<COutput>& utxo_pool)
137 : : {
138 : 2 : utxo_pool.clear();
139 : 2 : CAmount target = 0;
140 [ + + ]: 33 : for (int i = 0; i < utxos; ++i) {
141 : 31 : target += CAmount{1} << (utxos+i);
142 : 31 : add_coin(CAmount{1} << (utxos+i), 2*i, utxo_pool);
143 : 31 : add_coin((CAmount{1} << (utxos+i)) + (CAmount{1} << (utxos-1-i)), 2*i + 1, utxo_pool);
144 : : }
145 : 2 : return target;
146 : : }
147 : :
148 : 2316 : inline std::vector<OutputGroup>& GroupCoins(const std::vector<COutput>& available_coins, bool subtract_fee_outputs = false)
149 : : {
150 [ + + + - ]: 2317 : static std::vector<OutputGroup> static_groups;
151 : 2316 : static_groups.clear();
152 [ + + ]: 279032 : for (auto& coin : available_coins) {
153 : 276716 : static_groups.emplace_back();
154 : 276716 : OutputGroup& group = static_groups.back();
155 [ + - ]: 276716 : group.Insert(std::make_shared<COutput>(coin), /*ancestors=*/ 0, /*descendants=*/ 0);
156 : 276716 : group.m_subtract_fee_outputs = subtract_fee_outputs;
157 : : }
158 : 2316 : return static_groups;
159 : : }
160 : :
161 : 3401 : inline std::vector<OutputGroup>& KnapsackGroupOutputs(const CoinsResult& available_coins, CWallet& wallet, const CoinEligibilityFilter& filter)
162 : : {
163 : 3401 : FastRandomContext rand{};
164 [ + + ]: 3401 : CoinSelectionParams coin_selection_params{
165 : : rand,
166 : : /*change_output_size=*/ 0,
167 : : /*change_spend_size=*/ 0,
168 : : /*min_change_target=*/ CENT,
169 : 3401 : /*effective_feerate=*/ CFeeRate(0),
170 : 3401 : /*long_term_feerate=*/ CFeeRate(0),
171 [ + + ]: 3401 : /*discard_feerate=*/ CFeeRate(0),
172 : : /*tx_noinputs_size=*/ 0,
173 : : /*avoid_partial=*/ false,
174 : 3401 : };
175 [ + + + - ]: 3401 : static OutputGroupTypeMap static_groups;
176 [ + - + - : 6802 : static_groups = GroupOutputs(wallet, available_coins, coin_selection_params, {{filter}})[filter];
+ - + - ]
177 : 3401 : return static_groups.all_groups.mixed_group;
178 : 3401 : }
179 : :
180 : 24 : static std::unique_ptr<CWallet> NewWallet(const node::NodeContext& m_node, const std::string& wallet_name = "")
181 : : {
182 [ + - + - ]: 24 : std::unique_ptr<CWallet> wallet = std::make_unique<CWallet>(m_node.chain.get(), wallet_name, CreateMockableWalletDatabase());
183 [ + - + - : 48 : BOOST_CHECK(wallet->LoadWallet() == DBErrors::LOAD_OK);
+ - + - ]
184 [ + - ]: 24 : LOCK(wallet->cs_wallet);
185 [ + - ]: 24 : wallet->SetWalletFlag(WALLET_FLAG_DESCRIPTORS);
186 [ + - ]: 24 : wallet->SetupDescriptorScriptPubKeyMans();
187 [ + - ]: 24 : return wallet;
188 : 24 : }
189 : :
190 : : // Branch and bound coin selection tests
191 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(bnb_search_test)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
192 : : {
193 : 1 : FastRandomContext rand{};
194 : : // Setup
195 : 1 : std::vector<COutput> utxo_pool;
196 [ + - ]: 1 : SelectionResult expected_result(CAmount(0), SelectionAlgorithm::BNB);
197 : :
198 : : /////////////////////////
199 : : // Known Outcome tests //
200 : : /////////////////////////
201 : :
202 : : // Empty utxo pool
203 [ + - + - : 2 : BOOST_CHECK(!SelectCoinsBnB(GroupCoins(utxo_pool), 1 * CENT, 0.5 * CENT));
+ - + - +
- ]
204 : :
205 : : // Add utxos
206 [ + - ]: 1 : add_coin(1 * CENT, 1, utxo_pool);
207 [ + - ]: 1 : add_coin(2 * CENT, 2, utxo_pool);
208 [ + - ]: 1 : add_coin(3 * CENT, 3, utxo_pool);
209 [ + - ]: 1 : add_coin(4 * CENT, 4, utxo_pool);
210 : :
211 : : // Select 1 Cent
212 [ + - ]: 1 : add_coin(1 * CENT, 1, expected_result);
213 [ + - + - ]: 1 : const auto result1 = SelectCoinsBnB(GroupCoins(utxo_pool), 1 * CENT, 0.5 * CENT);
214 [ + - + - : 2 : BOOST_CHECK(result1);
+ - ]
215 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result1));
+ - + - ]
216 [ + - + - : 1 : BOOST_CHECK_EQUAL(result1->GetSelectedValue(), 1 * CENT);
+ - ]
217 [ + - ]: 1 : expected_result.Clear();
218 : :
219 : : // Select 2 Cent
220 [ + - ]: 1 : add_coin(2 * CENT, 2, expected_result);
221 [ + - + - ]: 1 : const auto result2 = SelectCoinsBnB(GroupCoins(utxo_pool), 2 * CENT, 0.5 * CENT);
222 [ + - + - : 2 : BOOST_CHECK(result2);
+ - ]
223 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result2));
+ - + - ]
224 [ + - + - : 1 : BOOST_CHECK_EQUAL(result2->GetSelectedValue(), 2 * CENT);
+ - ]
225 [ + - ]: 1 : expected_result.Clear();
226 : :
227 : : // Select 5 Cent
228 [ + - ]: 1 : add_coin(3 * CENT, 3, expected_result);
229 [ + - ]: 1 : add_coin(2 * CENT, 2, expected_result);
230 [ + - + - ]: 1 : const auto result3 = SelectCoinsBnB(GroupCoins(utxo_pool), 5 * CENT, 0.5 * CENT);
231 [ + - + - : 2 : BOOST_CHECK(result3);
+ - ]
232 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result3));
+ - + - ]
233 [ + - + - : 1 : BOOST_CHECK_EQUAL(result3->GetSelectedValue(), 5 * CENT);
+ - ]
234 [ + - ]: 1 : expected_result.Clear();
235 : :
236 : : // Select 11 Cent, not possible
237 [ + - + - : 2 : BOOST_CHECK(!SelectCoinsBnB(GroupCoins(utxo_pool), 11 * CENT, 0.5 * CENT));
+ - + - +
- ]
238 [ + - ]: 1 : expected_result.Clear();
239 : :
240 : : // Cost of change is greater than the difference between target value and utxo sum
241 [ + - ]: 1 : add_coin(1 * CENT, 1, expected_result);
242 [ + - + - ]: 1 : const auto result4 = SelectCoinsBnB(GroupCoins(utxo_pool), 0.9 * CENT, 0.5 * CENT);
243 [ + - + - : 2 : BOOST_CHECK(result4);
+ - ]
244 [ + - + - : 1 : BOOST_CHECK_EQUAL(result4->GetSelectedValue(), 1 * CENT);
+ - ]
245 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result4));
+ - + - ]
246 [ + - ]: 1 : expected_result.Clear();
247 : :
248 : : // Cost of change is less than the difference between target value and utxo sum
249 [ + - + - : 2 : BOOST_CHECK(!SelectCoinsBnB(GroupCoins(utxo_pool), 0.9 * CENT, 0));
+ - + - +
- ]
250 [ + - ]: 1 : expected_result.Clear();
251 : :
252 : : // Select 10 Cent
253 [ + - ]: 1 : add_coin(5 * CENT, 5, utxo_pool);
254 [ + - ]: 1 : add_coin(4 * CENT, 4, expected_result);
255 [ + - ]: 1 : add_coin(3 * CENT, 3, expected_result);
256 [ + - ]: 1 : add_coin(2 * CENT, 2, expected_result);
257 [ + - ]: 1 : add_coin(1 * CENT, 1, expected_result);
258 [ + - + - ]: 1 : const auto result5 = SelectCoinsBnB(GroupCoins(utxo_pool), 10 * CENT, 0.5 * CENT);
259 [ + - + - : 2 : BOOST_CHECK(result5);
+ - ]
260 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result5));
+ - + - ]
261 [ + - + - : 1 : BOOST_CHECK_EQUAL(result5->GetSelectedValue(), 10 * CENT);
+ - ]
262 [ + - ]: 1 : expected_result.Clear();
263 : :
264 : : // Select 0.25 Cent, not possible
265 [ + - + - : 2 : BOOST_CHECK(!SelectCoinsBnB(GroupCoins(utxo_pool), 0.25 * CENT, 0.5 * CENT));
+ - + - +
- ]
266 [ + - ]: 1 : expected_result.Clear();
267 : :
268 : : // Iteration exhaustion test
269 [ + - ]: 1 : CAmount target = make_hard_case(17, utxo_pool);
270 [ + - + - : 2 : BOOST_CHECK(!SelectCoinsBnB(GroupCoins(utxo_pool), target, 1)); // Should exhaust
+ - + - +
- ]
271 [ + - ]: 1 : target = make_hard_case(14, utxo_pool);
272 [ + - + - ]: 1 : const auto result7 = SelectCoinsBnB(GroupCoins(utxo_pool), target, 1); // Should not exhaust
273 [ + - + - ]: 2 : BOOST_CHECK(result7);
274 : :
275 : : // Test same value early bailout optimization
276 : 1 : utxo_pool.clear();
277 [ + - ]: 1 : add_coin(7 * CENT, 7, expected_result);
278 [ + - ]: 1 : add_coin(7 * CENT, 7, expected_result);
279 [ + - ]: 1 : add_coin(7 * CENT, 7, expected_result);
280 [ + - ]: 1 : add_coin(7 * CENT, 7, expected_result);
281 [ + - ]: 1 : add_coin(2 * CENT, 7, expected_result);
282 [ + - ]: 1 : add_coin(7 * CENT, 7, utxo_pool);
283 [ + - ]: 1 : add_coin(7 * CENT, 7, utxo_pool);
284 [ + - ]: 1 : add_coin(7 * CENT, 7, utxo_pool);
285 [ + - ]: 1 : add_coin(7 * CENT, 7, utxo_pool);
286 [ + - ]: 1 : add_coin(2 * CENT, 7, utxo_pool);
287 [ + + ]: 50001 : for (int i = 0; i < 50000; ++i) {
288 [ + - ]: 50000 : add_coin(5 * CENT, 7, utxo_pool);
289 : : }
290 [ + - + - ]: 1 : const auto result8 = SelectCoinsBnB(GroupCoins(utxo_pool), 30 * CENT, 5000);
291 [ + - + - : 2 : BOOST_CHECK(result8);
+ - ]
292 [ + - + - : 1 : BOOST_CHECK_EQUAL(result8->GetSelectedValue(), 30 * CENT);
+ - ]
293 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result8));
+ - ]
294 : :
295 : : ////////////////////
296 : : // Behavior tests //
297 : : ////////////////////
298 : : // Select 1 Cent with pool of only greater than 5 Cent
299 : 1 : utxo_pool.clear();
300 [ + + ]: 17 : for (int i = 5; i <= 20; ++i) {
301 [ + - ]: 16 : add_coin(i * CENT, i, utxo_pool);
302 : : }
303 : : // Run 100 times, to make sure it is never finding a solution
304 [ + + ]: 101 : for (int i = 0; i < 100; ++i) {
305 [ + - + - : 200 : BOOST_CHECK(!SelectCoinsBnB(GroupCoins(utxo_pool), 1 * CENT, 2 * CENT));
+ - + - ]
306 : : }
307 : :
308 : : // Make sure that effective value is working in AttemptSelection when BnB is used
309 [ + - ]: 1 : CoinSelectionParams coin_selection_params_bnb{
310 : : rand,
311 : : /*change_output_size=*/ 31,
312 : : /*change_spend_size=*/ 68,
313 : : /*min_change_target=*/ 0,
314 : 1 : /*effective_feerate=*/ CFeeRate(3000),
315 : 1 : /*long_term_feerate=*/ CFeeRate(1000),
316 [ + - ]: 1 : /*discard_feerate=*/ CFeeRate(1000),
317 : : /*tx_noinputs_size=*/ 0,
318 : : /*avoid_partial=*/ false,
319 : 1 : };
320 [ + - ]: 1 : coin_selection_params_bnb.m_change_fee = coin_selection_params_bnb.m_effective_feerate.GetFee(coin_selection_params_bnb.change_output_size);
321 [ + - ]: 1 : coin_selection_params_bnb.m_cost_of_change = coin_selection_params_bnb.m_effective_feerate.GetFee(coin_selection_params_bnb.change_spend_size) + coin_selection_params_bnb.m_change_fee;
322 [ + - ]: 1 : coin_selection_params_bnb.min_viable_change = coin_selection_params_bnb.m_effective_feerate.GetFee(coin_selection_params_bnb.change_spend_size);
323 : :
324 : 1 : {
325 [ + - + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
326 : :
327 [ + - ]: 1 : CoinsResult available_coins;
328 : :
329 [ + - ]: 1 : add_coin(available_coins, *wallet, 1, coin_selection_params_bnb.m_effective_feerate);
330 [ + - ]: 2 : available_coins.All().at(0).input_bytes = 40; // Make sure that it has a negative effective value. The next check should assert if this somehow got through. Otherwise it will fail
331 [ + - + - : 2 : BOOST_CHECK(!SelectCoinsBnB(GroupCoins(available_coins.All()), 1 * CENT, coin_selection_params_bnb.m_cost_of_change));
+ - + - +
- + - ]
332 : :
333 : : // Test fees subtracted from output:
334 [ + - ]: 1 : available_coins.Clear();
335 [ + - ]: 1 : add_coin(available_coins, *wallet, 1 * CENT, coin_selection_params_bnb.m_effective_feerate);
336 [ + - ]: 2 : available_coins.All().at(0).input_bytes = 40;
337 [ + - + - : 1 : const auto result9 = SelectCoinsBnB(GroupCoins(available_coins.All()), 1 * CENT, coin_selection_params_bnb.m_cost_of_change);
+ - ]
338 [ + - + - : 2 : BOOST_CHECK(result9);
+ - ]
339 [ + - + - : 1 : BOOST_CHECK_EQUAL(result9->GetSelectedValue(), 1 * CENT);
+ - ]
340 [ + - ]: 1 : }
341 : :
342 : 1 : {
343 [ + - + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
344 : :
345 [ + - ]: 1 : CoinsResult available_coins;
346 : :
347 [ + - ]: 1 : coin_selection_params_bnb.m_effective_feerate = CFeeRate(0);
348 [ + - ]: 1 : add_coin(available_coins, *wallet, 5 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
349 [ + - ]: 1 : add_coin(available_coins, *wallet, 3 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
350 [ + - ]: 1 : add_coin(available_coins, *wallet, 2 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
351 [ + - ]: 1 : CCoinControl coin_control;
352 : 1 : coin_control.m_allow_other_inputs = true;
353 [ + - ]: 2 : COutput select_coin = available_coins.All().at(0);
354 [ + - ]: 1 : coin_control.Select(select_coin.outpoint);
355 [ + - ]: 1 : PreSelectedInputs selected_input;
356 [ + - ]: 1 : selected_input.Insert(select_coin, coin_selection_params_bnb.m_subtract_fee_outputs);
357 [ + - + - : 3 : available_coins.Erase({available_coins.coins[OutputType::BECH32].begin()->outpoint});
+ - + - ]
358 : :
359 [ + - ]: 1 : LOCK(wallet->cs_wallet);
360 [ + - ]: 1 : const auto result10 = SelectCoins(*wallet, available_coins, selected_input, 10 * CENT, coin_control, coin_selection_params_bnb);
361 [ + - + - ]: 2 : BOOST_CHECK(result10);
362 [ + - + - ]: 2 : }
363 : 1 : {
364 [ + - + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
365 [ + - ]: 1 : LOCK(wallet->cs_wallet); // Every 'SelectCoins' call requires it
366 : :
367 [ + - ]: 1 : CoinsResult available_coins;
368 : :
369 : : // single coin should be selected when effective fee > long term fee
370 [ + - ]: 1 : coin_selection_params_bnb.m_effective_feerate = CFeeRate(5000);
371 : 1 : coin_selection_params_bnb.m_long_term_feerate = CFeeRate(3000);
372 : :
373 : : // Add selectable outputs, increasing their raw amounts by their input fee to make the effective value equal to the raw amount
374 [ + - ]: 1 : CAmount input_fee = coin_selection_params_bnb.m_effective_feerate.GetFee(/*num_bytes=*/68); // bech32 input size (default test output type)
375 [ + - ]: 1 : add_coin(available_coins, *wallet, 10 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
376 [ + - ]: 1 : add_coin(available_coins, *wallet, 9 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
377 [ + - ]: 1 : add_coin(available_coins, *wallet, 1 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
378 : :
379 [ + - ]: 1 : expected_result.Clear();
380 [ + - ]: 1 : add_coin(10 * CENT + input_fee, 2, expected_result);
381 [ + - ]: 1 : CCoinControl coin_control;
382 : 0 : const auto result11 = SelectCoins(*wallet, available_coins, /*pre_set_inputs=*/{}, 10 * CENT, coin_control, coin_selection_params_bnb);
383 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result11));
+ - + - ]
384 [ + - ]: 1 : available_coins.Clear();
385 : :
386 : : // more coins should be selected when effective fee < long term fee
387 [ + - ]: 1 : coin_selection_params_bnb.m_effective_feerate = CFeeRate(3000);
388 : 1 : coin_selection_params_bnb.m_long_term_feerate = CFeeRate(5000);
389 : :
390 : : // Add selectable outputs, increasing their raw amounts by their input fee to make the effective value equal to the raw amount
391 [ + - ]: 1 : input_fee = coin_selection_params_bnb.m_effective_feerate.GetFee(/*num_bytes=*/68); // bech32 input size (default test output type)
392 [ + - ]: 1 : add_coin(available_coins, *wallet, 10 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
393 [ + - ]: 1 : add_coin(available_coins, *wallet, 9 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
394 [ + - ]: 1 : add_coin(available_coins, *wallet, 1 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
395 : :
396 [ + - ]: 1 : expected_result.Clear();
397 [ + - ]: 1 : add_coin(9 * CENT + input_fee, 2, expected_result);
398 [ + - ]: 1 : add_coin(1 * CENT + input_fee, 2, expected_result);
399 : 0 : const auto result12 = SelectCoins(*wallet, available_coins, /*pre_set_inputs=*/{}, 10 * CENT, coin_control, coin_selection_params_bnb);
400 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result12));
+ - + - ]
401 [ + - ]: 1 : available_coins.Clear();
402 : :
403 : : // pre selected coin should be selected even if disadvantageous
404 [ + - ]: 1 : coin_selection_params_bnb.m_effective_feerate = CFeeRate(5000);
405 : 1 : coin_selection_params_bnb.m_long_term_feerate = CFeeRate(3000);
406 : :
407 : : // Add selectable outputs, increasing their raw amounts by their input fee to make the effective value equal to the raw amount
408 [ + - ]: 1 : input_fee = coin_selection_params_bnb.m_effective_feerate.GetFee(/*num_bytes=*/68); // bech32 input size (default test output type)
409 [ + - ]: 1 : add_coin(available_coins, *wallet, 10 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
410 [ + - ]: 1 : add_coin(available_coins, *wallet, 9 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
411 [ + - ]: 1 : add_coin(available_coins, *wallet, 1 * CENT + input_fee, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
412 : :
413 [ + - ]: 1 : expected_result.Clear();
414 [ + - ]: 1 : add_coin(9 * CENT + input_fee, 2, expected_result);
415 [ + - ]: 1 : add_coin(1 * CENT + input_fee, 2, expected_result);
416 : 1 : coin_control.m_allow_other_inputs = true;
417 [ + - ]: 2 : COutput select_coin = available_coins.All().at(1); // pre select 9 coin
418 [ + - ]: 1 : coin_control.Select(select_coin.outpoint);
419 [ + - ]: 1 : PreSelectedInputs selected_input;
420 [ + - ]: 1 : selected_input.Insert(select_coin, coin_selection_params_bnb.m_subtract_fee_outputs);
421 [ + - + - : 3 : available_coins.Erase({(++available_coins.coins[OutputType::BECH32].begin())->outpoint});
+ - + - ]
422 [ + - ]: 1 : const auto result13 = SelectCoins(*wallet, available_coins, selected_input, 10 * CENT, coin_control, coin_selection_params_bnb);
423 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *result13));
+ - ]
424 [ + - + - ]: 2 : }
425 : :
426 : 1 : {
427 : : // Test bnb max weight exceeded
428 : : // Inputs set [10, 9, 8, 5, 3, 1], Selection Target = 16 and coin 5 exceeding the max weight.
429 : :
430 [ + - + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
431 : :
432 [ + - ]: 1 : CoinsResult available_coins;
433 [ + - ]: 1 : add_coin(available_coins, *wallet, 10 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
434 [ + - ]: 1 : add_coin(available_coins, *wallet, 9 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
435 [ + - ]: 1 : add_coin(available_coins, *wallet, 8 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
436 [ + - ]: 1 : add_coin(available_coins, *wallet, 5 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true, /*custom_size=*/MAX_STANDARD_TX_WEIGHT);
437 [ + - ]: 1 : add_coin(available_coins, *wallet, 3 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
438 [ + - ]: 1 : add_coin(available_coins, *wallet, 1 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
439 : :
440 : 1 : CAmount selection_target = 16 * CENT;
441 : 0 : const auto& no_res = SelectCoinsBnB(GroupCoins(available_coins.All(), /*subtract_fee_outputs*/true),
442 [ + - + - : 1 : selection_target, /*cost_of_change=*/0, MAX_STANDARD_TX_WEIGHT);
+ - ]
443 [ + - + - : 2 : BOOST_REQUIRE(!no_res);
+ - ]
444 [ + - + - : 3 : BOOST_CHECK(util::ErrorString(no_res).original.find("The inputs size exceeds the maximum weight") != std::string::npos);
+ - + - ]
445 : :
446 : : // Now add same coin value with a good size and check that it gets selected
447 [ + - ]: 1 : add_coin(available_coins, *wallet, 5 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
448 [ + - + - : 1 : const auto& res = SelectCoinsBnB(GroupCoins(available_coins.All(), /*subtract_fee_outputs*/true), selection_target, /*cost_of_change=*/0);
+ - ]
449 : :
450 [ + - ]: 1 : expected_result.Clear();
451 [ + - ]: 1 : add_coin(8 * CENT, 2, expected_result);
452 [ + - ]: 1 : add_coin(5 * CENT, 2, expected_result);
453 [ + - ]: 1 : add_coin(3 * CENT, 2, expected_result);
454 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *res));
+ - ]
455 [ + - ]: 2 : }
456 [ + - + - ]: 3 : }
457 : :
458 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(bnb_sffo_restriction)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
459 : : {
460 : : // Verify the coin selection process does not produce a BnB solution when SFFO is enabled.
461 : : // This is currently problematic because it could require a change output. And BnB is specialized on changeless solutions.
462 [ + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
463 [ + - ]: 2 : WITH_LOCK(wallet->cs_wallet, wallet->SetLastBlockProcessed(300, uint256{})); // set a high block so internal UTXOs are selectable
464 : :
465 : 1 : FastRandomContext rand{};
466 [ + - ]: 1 : CoinSelectionParams params{
467 : : rand,
468 : : /*change_output_size=*/ 31, // unused value, p2wpkh output size (wallet default change type)
469 : : /*change_spend_size=*/ 68, // unused value, p2wpkh input size (high-r signature)
470 : : /*min_change_target=*/ 0, // dummy, set later
471 : 1 : /*effective_feerate=*/ CFeeRate(3000),
472 : 1 : /*long_term_feerate=*/ CFeeRate(1000),
473 [ + - ]: 1 : /*discard_feerate=*/ CFeeRate(1000),
474 : : /*tx_noinputs_size=*/ 0,
475 : : /*avoid_partial=*/ false,
476 : 1 : };
477 : 1 : params.m_subtract_fee_outputs = true;
478 [ + - ]: 1 : params.m_change_fee = params.m_effective_feerate.GetFee(params.change_output_size);
479 [ + - ]: 1 : params.m_cost_of_change = params.m_discard_feerate.GetFee(params.change_spend_size) + params.m_change_fee;
480 : 1 : params.m_min_change_target = params.m_cost_of_change + 1;
481 : : // Add spendable coin at the BnB selection upper bound
482 [ + - ]: 1 : CoinsResult available_coins;
483 [ + - ]: 1 : add_coin(available_coins, *wallet, COIN + params.m_cost_of_change, /*feerate=*/params.m_effective_feerate, /*nAge=*/6, /*fIsFromMe=*/true, /*nInput=*/0, /*spendable=*/true);
484 [ + - ]: 1 : add_coin(available_coins, *wallet, 0.5 * COIN + params.m_cost_of_change, /*feerate=*/params.m_effective_feerate, /*nAge=*/6, /*fIsFromMe=*/true, /*nInput=*/0, /*spendable=*/true);
485 [ + - ]: 1 : add_coin(available_coins, *wallet, 0.5 * COIN, /*feerate=*/params.m_effective_feerate, /*nAge=*/6, /*fIsFromMe=*/true, /*nInput=*/0, /*spendable=*/true);
486 : : // Knapsack will only find a changeless solution on an exact match to the satoshi, SRD doesn’t look for changeless
487 : : // If BnB were run, it would produce a single input solution with the best waste score
488 [ + - + - : 4 : auto result = WITH_LOCK(wallet->cs_wallet, return SelectCoins(*wallet, available_coins, /*pre_set_inputs=*/{}, COIN, /*coin_control=*/{}, params));
+ - ]
489 [ + - + - : 2 : BOOST_CHECK(result.has_value());
+ - ]
490 [ + - + - ]: 1 : BOOST_CHECK_NE(result->GetAlgo(), SelectionAlgorithm::BNB);
491 [ + - + - : 2 : BOOST_CHECK(result->GetInputSet().size() == 2);
+ - + - ]
492 : : // We have only considered BnB, SRD, and Knapsack. Test needs to be reevaluated if new algo is added
493 [ + - + - : 3 : BOOST_CHECK(result->GetAlgo() == SelectionAlgorithm::SRD || result->GetAlgo() == SelectionAlgorithm::KNAPSACK);
+ - + - ]
494 [ + - ]: 2 : }
495 : :
496 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(knapsack_solver_test)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
497 : : {
498 : 1 : FastRandomContext rand{};
499 : 5601 : const auto temp1{[&rand](std::vector<OutputGroup>& g, const CAmount& v, CAmount c) { return KnapsackSolver(g, v, c, rand); }};
500 : 1 : const auto KnapsackSolver{temp1};
501 [ + - + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
502 : :
503 : 1 : CoinsResult available_coins;
504 : :
505 : : // test multiple times to allow for differences in the shuffle order
506 [ + + ]: 101 : for (int i = 0; i < RUN_TESTS; i++)
507 : : {
508 [ + - ]: 100 : available_coins.Clear();
509 : :
510 : : // with an empty wallet we can't even pay one cent
511 [ + - + - : 200 : BOOST_CHECK(!KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_standard), 1 * CENT, CENT));
+ - + - +
- ]
512 : :
513 [ + - ]: 100 : add_coin(available_coins, *wallet, 1*CENT, CFeeRate(0), 4); // add a new 1 cent coin
514 : :
515 : : // with a new 1 cent coin, we still can't find a mature 1 cent
516 [ + - + - : 200 : BOOST_CHECK(!KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_standard), 1 * CENT, CENT));
+ - + - +
- ]
517 : :
518 : : // but we can find a new 1 cent
519 [ + - + - ]: 100 : const auto result1 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 1 * CENT, CENT);
520 [ + - + - : 200 : BOOST_CHECK(result1);
+ - ]
521 [ + - + - : 100 : BOOST_CHECK_EQUAL(result1->GetSelectedValue(), 1 * CENT);
+ - ]
522 : :
523 [ + - ]: 100 : add_coin(available_coins, *wallet, 2*CENT); // add a mature 2 cent coin
524 : :
525 : : // we can't make 3 cents of mature coins
526 [ + - + - : 200 : BOOST_CHECK(!KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_standard), 3 * CENT, CENT));
+ - + - +
- ]
527 : :
528 : : // we can make 3 cents of new coins
529 [ + - + - ]: 100 : const auto result2 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 3 * CENT, CENT);
530 [ + - + - : 200 : BOOST_CHECK(result2);
+ - ]
531 [ + - + - : 100 : BOOST_CHECK_EQUAL(result2->GetSelectedValue(), 3 * CENT);
+ - ]
532 : :
533 [ + - ]: 100 : add_coin(available_coins, *wallet, 5*CENT); // add a mature 5 cent coin,
534 [ + - ]: 100 : add_coin(available_coins, *wallet, 10*CENT, CFeeRate(0), 3, true); // a new 10 cent coin sent from one of our own addresses
535 [ + - ]: 100 : add_coin(available_coins, *wallet, 20*CENT); // and a mature 20 cent coin
536 : :
537 : : // now we have new: 1+10=11 (of which 10 was self-sent), and mature: 2+5+20=27. total = 38
538 : :
539 : : // we can't make 38 cents only if we disallow new coins:
540 [ + - + - : 200 : BOOST_CHECK(!KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_standard), 38 * CENT, CENT));
+ - + - +
- ]
541 : : // we can't even make 37 cents if we don't allow new coins even if they're from us
542 [ + - + - : 200 : BOOST_CHECK(!KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_standard_extra), 38 * CENT, CENT));
+ - + - +
- ]
543 : : // but we can make 37 cents if we accept new coins from ourself
544 [ + - + - ]: 100 : const auto result3 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_standard), 37 * CENT, CENT);
545 [ + - + - : 200 : BOOST_CHECK(result3);
+ - ]
546 [ + - + - : 100 : BOOST_CHECK_EQUAL(result3->GetSelectedValue(), 37 * CENT);
+ - ]
547 : : // and we can make 38 cents if we accept all new coins
548 [ + - + - ]: 100 : const auto result4 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 38 * CENT, CENT);
549 [ + - + - : 200 : BOOST_CHECK(result4);
+ - ]
550 [ + - + - : 100 : BOOST_CHECK_EQUAL(result4->GetSelectedValue(), 38 * CENT);
+ - ]
551 : :
552 : : // try making 34 cents from 1,2,5,10,20 - we can't do it exactly
553 [ + - + - ]: 100 : const auto result5 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 34 * CENT, CENT);
554 [ + - + - : 200 : BOOST_CHECK(result5);
+ - ]
555 [ + - + - : 100 : BOOST_CHECK_EQUAL(result5->GetSelectedValue(), 35 * CENT); // but 35 cents is closest
+ - ]
556 [ + - + - : 100 : BOOST_CHECK_EQUAL(result5->GetInputSet().size(), 3U); // the best should be 20+10+5. it's incredibly unlikely the 1 or 2 got included (but possible)
+ - ]
557 : :
558 : : // when we try making 7 cents, the smaller coins (1,2,5) are enough. We should see just 2+5
559 [ + - + - ]: 100 : const auto result6 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 7 * CENT, CENT);
560 [ + - + - : 200 : BOOST_CHECK(result6);
+ - ]
561 [ + - + - : 100 : BOOST_CHECK_EQUAL(result6->GetSelectedValue(), 7 * CENT);
+ - ]
562 [ + - + - : 100 : BOOST_CHECK_EQUAL(result6->GetInputSet().size(), 2U);
+ - ]
563 : :
564 : : // when we try making 8 cents, the smaller coins (1,2,5) are exactly enough.
565 [ + - + - ]: 100 : const auto result7 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 8 * CENT, CENT);
566 [ + - + - : 200 : BOOST_CHECK(result7);
+ - ]
567 [ + - + - : 200 : BOOST_CHECK(result7->GetSelectedValue() == 8 * CENT);
+ - + - ]
568 [ + - + - : 100 : BOOST_CHECK_EQUAL(result7->GetInputSet().size(), 3U);
+ - ]
569 : :
570 : : // when we try making 9 cents, no subset of smaller coins is enough, and we get the next bigger coin (10)
571 [ + - + - ]: 100 : const auto result8 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 9 * CENT, CENT);
572 [ + - + - : 200 : BOOST_CHECK(result8);
+ - ]
573 [ + - + - : 100 : BOOST_CHECK_EQUAL(result8->GetSelectedValue(), 10 * CENT);
+ - ]
574 [ + - + - : 100 : BOOST_CHECK_EQUAL(result8->GetInputSet().size(), 1U);
+ - ]
575 : :
576 : : // now clear out the wallet and start again to test choosing between subsets of smaller coins and the next biggest coin
577 [ + - ]: 100 : available_coins.Clear();
578 : :
579 [ + - ]: 100 : add_coin(available_coins, *wallet, 6*CENT);
580 [ + - ]: 100 : add_coin(available_coins, *wallet, 7*CENT);
581 [ + - ]: 100 : add_coin(available_coins, *wallet, 8*CENT);
582 [ + - ]: 100 : add_coin(available_coins, *wallet, 20*CENT);
583 [ + - ]: 100 : add_coin(available_coins, *wallet, 30*CENT); // now we have 6+7+8+20+30 = 71 cents total
584 : :
585 : : // check that we have 71 and not 72
586 [ + - + - ]: 100 : const auto result9 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 71 * CENT, CENT);
587 [ + - + - : 200 : BOOST_CHECK(result9);
+ - ]
588 [ + - + - : 200 : BOOST_CHECK(!KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 72 * CENT, CENT));
+ - + - +
- ]
589 : :
590 : : // now try making 16 cents. the best smaller coins can do is 6+7+8 = 21; not as good at the next biggest coin, 20
591 [ + - + - ]: 100 : const auto result10 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 16 * CENT, CENT);
592 [ + - + - : 200 : BOOST_CHECK(result10);
+ - ]
593 [ + - + - : 100 : BOOST_CHECK_EQUAL(result10->GetSelectedValue(), 20 * CENT); // we should get 20 in one coin
+ - ]
594 [ + - + - : 100 : BOOST_CHECK_EQUAL(result10->GetInputSet().size(), 1U);
+ - ]
595 : :
596 [ + - ]: 100 : add_coin(available_coins, *wallet, 5*CENT); // now we have 5+6+7+8+20+30 = 75 cents total
597 : :
598 : : // now if we try making 16 cents again, the smaller coins can make 5+6+7 = 18 cents, better than the next biggest coin, 20
599 [ + - + - ]: 100 : const auto result11 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 16 * CENT, CENT);
600 [ + - + - : 200 : BOOST_CHECK(result11);
+ - ]
601 [ + - + - : 100 : BOOST_CHECK_EQUAL(result11->GetSelectedValue(), 18 * CENT); // we should get 18 in 3 coins
+ - ]
602 [ + - + - : 100 : BOOST_CHECK_EQUAL(result11->GetInputSet().size(), 3U);
+ - ]
603 : :
604 [ + - ]: 100 : add_coin(available_coins, *wallet, 18*CENT); // now we have 5+6+7+8+18+20+30
605 : :
606 : : // and now if we try making 16 cents again, the smaller coins can make 5+6+7 = 18 cents, the same as the next biggest coin, 18
607 [ + - + - ]: 100 : const auto result12 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 16 * CENT, CENT);
608 [ + - + - : 200 : BOOST_CHECK(result12);
+ - ]
609 [ + - + - : 100 : BOOST_CHECK_EQUAL(result12->GetSelectedValue(), 18 * CENT); // we should get 18 in 1 coin
+ - ]
610 [ + - + - : 100 : BOOST_CHECK_EQUAL(result12->GetInputSet().size(), 1U); // because in the event of a tie, the biggest coin wins
+ - ]
611 : :
612 : : // now try making 11 cents. we should get 5+6
613 [ + - + - ]: 100 : const auto result13 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 11 * CENT, CENT);
614 [ + - + - : 200 : BOOST_CHECK(result13);
+ - ]
615 [ + - + - : 100 : BOOST_CHECK_EQUAL(result13->GetSelectedValue(), 11 * CENT);
+ - ]
616 [ + - + - : 100 : BOOST_CHECK_EQUAL(result13->GetInputSet().size(), 2U);
+ - ]
617 : :
618 : : // check that the smallest bigger coin is used
619 [ + - ]: 100 : add_coin(available_coins, *wallet, 1*COIN);
620 [ + - ]: 100 : add_coin(available_coins, *wallet, 2*COIN);
621 [ + - ]: 100 : add_coin(available_coins, *wallet, 3*COIN);
622 [ + - ]: 100 : add_coin(available_coins, *wallet, 4*COIN); // now we have 5+6+7+8+18+20+30+100+200+300+400 = 1094 cents
623 [ + - + - ]: 100 : const auto result14 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 95 * CENT, CENT);
624 [ + - + - : 200 : BOOST_CHECK(result14);
+ - ]
625 [ + - + - : 100 : BOOST_CHECK_EQUAL(result14->GetSelectedValue(), 1 * COIN); // we should get 1 BTC in 1 coin
+ - ]
626 [ + - + - : 100 : BOOST_CHECK_EQUAL(result14->GetInputSet().size(), 1U);
+ - ]
627 : :
628 [ + - + - ]: 100 : const auto result15 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 195 * CENT, CENT);
629 [ + - + - : 200 : BOOST_CHECK(result15);
+ - ]
630 [ + - + - : 100 : BOOST_CHECK_EQUAL(result15->GetSelectedValue(), 2 * COIN); // we should get 2 BTC in 1 coin
+ - ]
631 [ + - + - : 100 : BOOST_CHECK_EQUAL(result15->GetInputSet().size(), 1U);
+ - ]
632 : :
633 : : // empty the wallet and start again, now with fractions of a cent, to test small change avoidance
634 : :
635 [ + - ]: 100 : available_coins.Clear();
636 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 1 / 10);
637 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 2 / 10);
638 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 3 / 10);
639 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 4 / 10);
640 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 5 / 10);
641 : :
642 : : // try making 1 * CENT from the 1.5 * CENT
643 : : // we'll get change smaller than CENT whatever happens, so can expect CENT exactly
644 [ + - + - ]: 100 : const auto result16 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), CENT, CENT);
645 [ + - + - : 200 : BOOST_CHECK(result16);
+ - ]
646 [ + - + - : 100 : BOOST_CHECK_EQUAL(result16->GetSelectedValue(), CENT);
+ - ]
647 : :
648 : : // but if we add a bigger coin, small change is avoided
649 [ + - ]: 100 : add_coin(available_coins, *wallet, 1111*CENT);
650 : :
651 : : // try making 1 from 0.1 + 0.2 + 0.3 + 0.4 + 0.5 + 1111 = 1112.5
652 [ + - + - ]: 100 : const auto result17 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 1 * CENT, CENT);
653 [ + - + - : 200 : BOOST_CHECK(result17);
+ - ]
654 [ + - + - : 100 : BOOST_CHECK_EQUAL(result17->GetSelectedValue(), 1 * CENT); // we should get the exact amount
+ - ]
655 : :
656 : : // if we add more small coins:
657 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 6 / 10);
658 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 7 / 10);
659 : :
660 : : // and try again to make 1.0 * CENT
661 [ + - + - ]: 100 : const auto result18 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 1 * CENT, CENT);
662 [ + - + - : 200 : BOOST_CHECK(result18);
+ - ]
663 [ + - + - : 100 : BOOST_CHECK_EQUAL(result18->GetSelectedValue(), 1 * CENT); // we should get the exact amount
+ - ]
664 : :
665 : : // run the 'mtgox' test (see https://blockexplorer.com/tx/29a3efd3ef04f9153d47a990bd7b048a4b2d213daaa5fb8ed670fb85f13bdbcf)
666 : : // they tried to consolidate 10 50k coins into one 500k coin, and ended up with 50k in change
667 [ + - ]: 100 : available_coins.Clear();
668 [ + + ]: 2100 : for (int j = 0; j < 20; j++)
669 [ + - ]: 2000 : add_coin(available_coins, *wallet, 50000 * COIN);
670 : :
671 [ + - + - ]: 100 : const auto result19 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 500000 * COIN, CENT);
672 [ + - + - : 200 : BOOST_CHECK(result19);
+ - ]
673 [ + - + - : 100 : BOOST_CHECK_EQUAL(result19->GetSelectedValue(), 500000 * COIN); // we should get the exact amount
+ - ]
674 [ + - + - : 100 : BOOST_CHECK_EQUAL(result19->GetInputSet().size(), 10U); // in ten coins
+ - ]
675 : :
676 : : // 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),
677 : : // we need to try finding an exact subset anyway
678 : :
679 : : // sometimes it will fail, and so we use the next biggest coin:
680 [ + - ]: 100 : available_coins.Clear();
681 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 5 / 10);
682 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 6 / 10);
683 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 7 / 10);
684 [ + - ]: 100 : add_coin(available_coins, *wallet, 1111 * CENT);
685 [ + - + - ]: 100 : const auto result20 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 1 * CENT, CENT);
686 [ + - + - : 200 : BOOST_CHECK(result20);
+ - ]
687 [ + - + - : 100 : BOOST_CHECK_EQUAL(result20->GetSelectedValue(), 1111 * CENT); // we get the bigger coin
+ - ]
688 [ + - + - : 100 : BOOST_CHECK_EQUAL(result20->GetInputSet().size(), 1U);
+ - ]
689 : :
690 : : // but sometimes it's possible, and we use an exact subset (0.4 + 0.6 = 1.0)
691 [ + - ]: 100 : available_coins.Clear();
692 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 4 / 10);
693 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 6 / 10);
694 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 8 / 10);
695 [ + - ]: 100 : add_coin(available_coins, *wallet, 1111 * CENT);
696 [ + - + - ]: 100 : const auto result21 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), CENT, CENT);
697 [ + - + - : 200 : BOOST_CHECK(result21);
+ - ]
698 [ + - + - : 100 : BOOST_CHECK_EQUAL(result21->GetSelectedValue(), CENT); // we should get the exact amount
+ - ]
699 [ + - + - : 100 : BOOST_CHECK_EQUAL(result21->GetInputSet().size(), 2U); // in two coins 0.4+0.6
+ - ]
700 : :
701 : : // test avoiding small change
702 [ + - ]: 100 : available_coins.Clear();
703 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 5 / 100);
704 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 1);
705 [ + - ]: 100 : add_coin(available_coins, *wallet, CENT * 100);
706 : :
707 : : // trying to make 100.01 from these three coins
708 [ + - + - ]: 100 : const auto result22 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), CENT * 10001 / 100, CENT);
709 [ + - + - : 200 : BOOST_CHECK(result22);
+ - ]
710 [ + - + - : 100 : BOOST_CHECK_EQUAL(result22->GetSelectedValue(), CENT * 10105 / 100); // we should get all coins
+ - ]
711 [ + - + - : 100 : BOOST_CHECK_EQUAL(result22->GetInputSet().size(), 3U);
+ - ]
712 : :
713 : : // but if we try to make 99.9, we should take the bigger of the two small coins to avoid small change
714 [ + - + - ]: 100 : const auto result23 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), CENT * 9990 / 100, CENT);
715 [ + - + - : 200 : BOOST_CHECK(result23);
+ - ]
716 [ + - + - : 100 : BOOST_CHECK_EQUAL(result23->GetSelectedValue(), 101 * CENT);
+ - ]
717 [ + - + - : 100 : BOOST_CHECK_EQUAL(result23->GetInputSet().size(), 2U);
+ - ]
718 : 100 : }
719 : :
720 : : // test with many inputs
721 [ + + ]: 6 : for (CAmount amt=1500; amt < COIN; amt*=10) {
722 [ + - ]: 5 : available_coins.Clear();
723 : : // Create 676 inputs (= (old MAX_STANDARD_TX_SIZE == 100000) / 148 bytes per input)
724 [ + + ]: 3385 : for (uint16_t j = 0; j < 676; j++)
725 [ + - ]: 3380 : add_coin(available_coins, *wallet, amt);
726 : :
727 : : // We only create the wallet once to save time, but we still run the coin selection RUN_TESTS times.
728 [ + + ]: 505 : for (int i = 0; i < RUN_TESTS; i++) {
729 [ + - + - ]: 500 : const auto result24 = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_confirmed), 2000, CENT);
730 [ + - + - : 1000 : BOOST_CHECK(result24);
+ + ]
731 : :
732 [ + + ]: 500 : if (amt - 2000 < CENT) {
733 : : // needs more than one input:
734 : 300 : uint16_t returnSize = std::ceil((2000.0 + CENT)/amt);
735 : 300 : CAmount returnValue = amt * returnSize;
736 [ + - + - : 300 : BOOST_CHECK_EQUAL(result24->GetSelectedValue(), returnValue);
+ - ]
737 [ + - + - : 300 : BOOST_CHECK_EQUAL(result24->GetInputSet().size(), returnSize);
+ - ]
738 : : } else {
739 : : // one input is sufficient:
740 [ + - + - : 200 : BOOST_CHECK_EQUAL(result24->GetSelectedValue(), amt);
+ - ]
741 [ + - + - : 200 : BOOST_CHECK_EQUAL(result24->GetInputSet().size(), 1U);
+ - ]
742 : : }
743 : 500 : }
744 : : }
745 : :
746 : : // test randomness
747 : 1 : {
748 [ + - ]: 1 : available_coins.Clear();
749 [ + + ]: 101 : for (int i2 = 0; i2 < 100; i2++)
750 [ + - ]: 100 : add_coin(available_coins, *wallet, COIN);
751 : :
752 : : // Again, we only create the wallet once to save time, but we still run the coin selection RUN_TESTS times.
753 [ + + ]: 101 : for (int i = 0; i < RUN_TESTS; i++) {
754 : : // picking 50 from 100 coins doesn't depend on the shuffle,
755 : : // but does depend on randomness in the stochastic approximation code
756 [ + - + - : 100 : const auto result25 = KnapsackSolver(GroupCoins(available_coins.All()), 50 * COIN, CENT);
+ - ]
757 [ + - + - : 200 : BOOST_CHECK(result25);
+ - ]
758 [ + - + - : 100 : const auto result26 = KnapsackSolver(GroupCoins(available_coins.All()), 50 * COIN, CENT);
+ - ]
759 [ + - + - : 200 : BOOST_CHECK(result26);
+ - ]
760 [ + - + - : 200 : BOOST_CHECK(!EqualResult(*result25, *result26));
+ - ]
761 : :
762 : 100 : int fails = 0;
763 [ + + ]: 600 : for (int j = 0; j < RANDOM_REPEATS; j++)
764 : : {
765 : : // Test that the KnapsackSolver selects randomly from equivalent coins (same value and same input size).
766 : : // When choosing 1 from 100 identical coins, 1% of the time, this test will choose the same coin twice
767 : : // which will cause it to fail.
768 : : // To avoid that issue, run the test RANDOM_REPEATS times and only complain if all of them fail
769 [ + - + - : 500 : const auto result27 = KnapsackSolver(GroupCoins(available_coins.All()), COIN, CENT);
+ - ]
770 [ + - + - : 1000 : BOOST_CHECK(result27);
+ - ]
771 [ + - + - : 500 : const auto result28 = KnapsackSolver(GroupCoins(available_coins.All()), COIN, CENT);
+ - ]
772 [ + - + - : 1000 : BOOST_CHECK(result28);
+ - ]
773 [ + - + + ]: 500 : if (EqualResult(*result27, *result28))
774 : 7 : fails++;
775 : 500 : }
776 [ + - + - ]: 100 : BOOST_CHECK_NE(fails, RANDOM_REPEATS);
777 : 100 : }
778 : :
779 : : // add 75 cents in small change. not enough to make 90 cents,
780 : : // then try making 90 cents. there are multiple competing "smallest bigger" coins,
781 : : // one of which should be picked at random
782 [ + - ]: 1 : add_coin(available_coins, *wallet, 5 * CENT);
783 [ + - ]: 1 : add_coin(available_coins, *wallet, 10 * CENT);
784 [ + - ]: 1 : add_coin(available_coins, *wallet, 15 * CENT);
785 [ + - ]: 1 : add_coin(available_coins, *wallet, 20 * CENT);
786 [ + - ]: 1 : add_coin(available_coins, *wallet, 25 * CENT);
787 : :
788 [ + + ]: 101 : for (int i = 0; i < RUN_TESTS; i++) {
789 : 100 : int fails = 0;
790 [ + + ]: 600 : for (int j = 0; j < RANDOM_REPEATS; j++)
791 : : {
792 [ + - + - : 500 : const auto result29 = KnapsackSolver(GroupCoins(available_coins.All()), 90 * CENT, CENT);
+ - ]
793 [ + - + - : 1000 : BOOST_CHECK(result29);
+ - ]
794 [ + - + - : 500 : const auto result30 = KnapsackSolver(GroupCoins(available_coins.All()), 90 * CENT, CENT);
+ - ]
795 [ + - + - : 1000 : BOOST_CHECK(result30);
+ - ]
796 [ + - + + ]: 500 : if (EqualResult(*result29, *result30))
797 : 8 : fails++;
798 : 500 : }
799 [ + - + - ]: 100 : BOOST_CHECK_NE(fails, RANDOM_REPEATS);
800 : : }
801 : : }
802 [ + - ]: 2 : }
803 : :
804 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(ApproximateBestSubset)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
805 : : {
806 : 1 : FastRandomContext rand{};
807 [ + - + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
808 : :
809 : 1 : CoinsResult available_coins;
810 : :
811 : : // Test vValue sort order
812 [ + + ]: 1001 : for (int i = 0; i < 1000; i++)
813 [ + - ]: 1000 : add_coin(available_coins, *wallet, 1000 * COIN);
814 [ + - ]: 1 : add_coin(available_coins, *wallet, 3 * COIN);
815 : :
816 [ + - + - ]: 1 : const auto result = KnapsackSolver(KnapsackGroupOutputs(available_coins, *wallet, filter_standard), 1003 * COIN, CENT, rand);
817 [ + - + - : 2 : BOOST_CHECK(result);
+ - ]
818 [ + - + - : 1 : BOOST_CHECK_EQUAL(result->GetSelectedValue(), 1003 * COIN);
+ - ]
819 [ + - + - : 1 : BOOST_CHECK_EQUAL(result->GetInputSet().size(), 2U);
+ - ]
820 [ + - ]: 2 : }
821 : :
822 : : // Tests that with the ideal conditions, the coin selector will always be able to find a solution that can pay the target value
823 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(SelectCoins_test)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
824 : : {
825 [ + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
826 [ + - ]: 1 : LOCK(wallet->cs_wallet); // Every 'SelectCoins' call requires it
827 : :
828 : : // Random generator stuff
829 : 1 : std::default_random_engine generator;
830 : 1 : std::exponential_distribution<double> distribution (100);
831 : 1 : FastRandomContext rand;
832 : :
833 : : // Run this test 100 times
834 [ + + ]: 101 : for (int i = 0; i < 100; ++i)
835 : : {
836 : 100 : CoinsResult available_coins;
837 : 100 : CAmount balance{0};
838 : :
839 : : // Make a wallet with 1000 exponentially distributed random inputs
840 [ + + ]: 100100 : for (int j = 0; j < 1000; ++j)
841 : : {
842 : 100000 : CAmount val = distribution(generator)*10000000;
843 [ + - ]: 100000 : add_coin(available_coins, *wallet, val);
844 : 100000 : balance += val;
845 : : }
846 : :
847 : : // Generate a random fee rate in the range of 100 - 400
848 : 100 : CFeeRate rate(rand.randrange(300) + 100);
849 : :
850 : : // Generate a random target value between 1000 and wallet balance
851 : 100 : CAmount target = rand.randrange(balance - 1000) + 1000;
852 : :
853 : : // Perform selection
854 [ + - ]: 100 : CoinSelectionParams cs_params{
855 : : rand,
856 : : /*change_output_size=*/ 34,
857 : : /*change_spend_size=*/ 148,
858 : : /*min_change_target=*/ CENT,
859 : 100 : /*effective_feerate=*/ CFeeRate(0),
860 : 100 : /*long_term_feerate=*/ CFeeRate(0),
861 [ + - ]: 100 : /*discard_feerate=*/ CFeeRate(0),
862 : : /*tx_noinputs_size=*/ 0,
863 : : /*avoid_partial=*/ false,
864 : 100 : };
865 : 100 : cs_params.m_cost_of_change = 1;
866 : 100 : cs_params.min_viable_change = 1;
867 [ + - ]: 100 : CCoinControl cc;
868 : 0 : const auto result = SelectCoins(*wallet, available_coins, /*pre_set_inputs=*/{}, target, cc, cs_params);
869 [ + - + - : 200 : BOOST_CHECK(result);
+ - ]
870 [ + - + - : 100 : BOOST_CHECK_GE(result->GetSelectedValue(), target);
+ - ]
871 : 100 : }
872 [ + - + - : 103 : }
+ - ]
873 : :
874 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(waste_test)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
875 : : {
876 : 1 : const CAmount fee{100};
877 : 1 : const CAmount min_viable_change{300};
878 : 1 : const CAmount change_cost{125};
879 : 1 : const CAmount change_fee{30};
880 : 1 : const CAmount fee_diff{40};
881 : 1 : const CAmount in_amt{3 * COIN};
882 : 1 : const CAmount target{2 * COIN};
883 : 1 : const CAmount excess{80};
884 : 1 : const CAmount exact_target{in_amt - fee * 2}; // Maximum spendable amount after fees: no change, no excess
885 : :
886 : : // In the following, we test that the waste is calculated correctly in various scenarios.
887 : : // Usually, RecalculateWaste would compute change_fee and change_cost on basis of the
888 : : // change output type, current feerate, and discard_feerate, but we use fixed values
889 : : // across this test to make the test easier to understand.
890 : 1 : {
891 : : // Waste with change is the change cost and difference between fee and long term fee
892 [ + - ]: 1 : SelectionResult selection1{target, SelectionAlgorithm::MANUAL};
893 [ + - ]: 1 : add_coin(1 * COIN, 1, selection1, /*fee=*/fee, /*long_term_fee=*/fee - fee_diff);
894 [ + - ]: 1 : add_coin(2 * COIN, 2, selection1, fee, fee - fee_diff);
895 [ + - ]: 1 : selection1.RecalculateWaste(min_viable_change, change_cost, change_fee);
896 [ + - + - : 1 : BOOST_CHECK_EQUAL(fee_diff * 2 + change_cost, selection1.GetWaste());
+ - ]
897 : :
898 : : // Waste will be greater when fee is greater, but long term fee is the same
899 [ + - ]: 1 : SelectionResult selection2{target, SelectionAlgorithm::MANUAL};
900 [ + - ]: 1 : add_coin(1 * COIN, 1, selection2, fee * 2, fee - fee_diff);
901 [ + - ]: 1 : add_coin(2 * COIN, 2, selection2, fee * 2, fee - fee_diff);
902 [ + - ]: 1 : selection2.RecalculateWaste(min_viable_change, change_cost, change_fee);
903 [ + - + - : 1 : BOOST_CHECK_GT(selection2.GetWaste(), selection1.GetWaste());
+ - + - ]
904 : :
905 : : // Waste with change is the change cost and difference between fee and long term fee
906 : : // With long term fee greater than fee, waste should be less than when long term fee is less than fee
907 [ + - ]: 1 : SelectionResult selection3{target, SelectionAlgorithm::MANUAL};
908 [ + - ]: 1 : add_coin(1 * COIN, 1, selection3, fee, fee + fee_diff);
909 [ + - ]: 1 : add_coin(2 * COIN, 2, selection3, fee, fee + fee_diff);
910 [ + - ]: 1 : selection3.RecalculateWaste(min_viable_change, change_cost, change_fee);
911 [ + - + - : 1 : BOOST_CHECK_EQUAL(fee_diff * -2 + change_cost, selection3.GetWaste());
+ - ]
912 [ + - + - : 1 : BOOST_CHECK_LT(selection3.GetWaste(), selection1.GetWaste());
+ - + - ]
913 : 1 : }
914 : :
915 : 1 : {
916 : : // Waste without change is the excess and difference between fee and long term fee
917 [ + - ]: 1 : SelectionResult selection_nochange1{exact_target - excess, SelectionAlgorithm::MANUAL};
918 [ + - ]: 1 : add_coin(1 * COIN, 1, selection_nochange1, fee, fee - fee_diff);
919 [ + - ]: 1 : add_coin(2 * COIN, 2, selection_nochange1, fee, fee - fee_diff);
920 [ + - ]: 1 : selection_nochange1.RecalculateWaste(min_viable_change, change_cost, change_fee);
921 [ + - + - : 1 : BOOST_CHECK_EQUAL(fee_diff * 2 + excess, selection_nochange1.GetWaste());
+ - ]
922 : :
923 : : // Waste without change is the excess and difference between fee and long term fee
924 : : // With long term fee greater than fee, waste should be less than when long term fee is less than fee
925 [ + - ]: 1 : SelectionResult selection_nochange2{exact_target - excess, SelectionAlgorithm::MANUAL};
926 [ + - ]: 1 : add_coin(1 * COIN, 1, selection_nochange2, fee, fee + fee_diff);
927 [ + - ]: 1 : add_coin(2 * COIN, 2, selection_nochange2, fee, fee + fee_diff);
928 [ + - ]: 1 : selection_nochange2.RecalculateWaste(min_viable_change, change_cost, change_fee);
929 [ + - + - : 1 : BOOST_CHECK_EQUAL(fee_diff * -2 + excess, selection_nochange2.GetWaste());
+ - ]
930 [ + - + - : 1 : BOOST_CHECK_LT(selection_nochange2.GetWaste(), selection_nochange1.GetWaste());
+ - + - ]
931 : 1 : }
932 : :
933 : 1 : {
934 : : // Waste with change and fee == long term fee is just cost of change
935 [ + - ]: 1 : SelectionResult selection{target, SelectionAlgorithm::MANUAL};
936 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, fee, fee);
937 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee);
938 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
939 [ + - + - : 1 : BOOST_CHECK_EQUAL(change_cost, selection.GetWaste());
+ - ]
940 : 0 : }
941 : :
942 : 1 : {
943 : : // Waste without change and fee == long term fee is just the excess
944 [ + - ]: 1 : SelectionResult selection{exact_target - excess, SelectionAlgorithm::MANUAL};
945 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, fee, fee);
946 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee);
947 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
948 [ + - + - : 1 : BOOST_CHECK_EQUAL(excess, selection.GetWaste());
+ - ]
949 : 0 : }
950 : :
951 : 1 : {
952 : : // Waste is 0 when fee == long_term_fee, no change, and no excess
953 [ + - ]: 1 : SelectionResult selection{exact_target, SelectionAlgorithm::MANUAL};
954 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, fee, fee);
955 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee);
956 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost , change_fee);
957 [ + - + - : 1 : BOOST_CHECK_EQUAL(0, selection.GetWaste());
+ - ]
958 : 0 : }
959 : :
960 : 1 : {
961 : : // Waste is 0 when (fee - long_term_fee) == (-cost_of_change), and no excess
962 [ + - ]: 1 : SelectionResult selection{target, SelectionAlgorithm::MANUAL};
963 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, fee, fee + fee_diff);
964 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee + fee_diff);
965 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, /*change_cost=*/fee_diff * 2, change_fee);
966 [ + - + - : 1 : BOOST_CHECK_EQUAL(0, selection.GetWaste());
+ - ]
967 : 0 : }
968 : :
969 : 1 : {
970 : : // Waste is 0 when (fee - long_term_fee) == (-excess), no change cost
971 : 1 : const CAmount new_target{exact_target - /*excess=*/fee_diff * 2};
972 [ + - ]: 1 : SelectionResult selection{new_target, SelectionAlgorithm::MANUAL};
973 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, fee, fee + fee_diff);
974 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee + fee_diff);
975 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
976 [ + - + - : 1 : BOOST_CHECK_EQUAL(0, selection.GetWaste());
+ - ]
977 : 0 : }
978 : :
979 : 1 : {
980 : : // Negative waste when the long term fee is greater than the current fee and the selected value == target
981 [ + - ]: 1 : SelectionResult selection{exact_target, SelectionAlgorithm::MANUAL};
982 : 1 : const CAmount target_waste1{-2 * fee_diff}; // = (2 * fee) - (2 * (fee + fee_diff))
983 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, fee, fee + fee_diff);
984 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee + fee_diff);
985 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
986 [ + - + - : 1 : BOOST_CHECK_EQUAL(target_waste1, selection.GetWaste());
+ - ]
987 : 0 : }
988 : :
989 : 1 : {
990 : : // Negative waste when the long term fee is greater than the current fee and change_cost < - (inputs * (fee - long_term_fee))
991 [ + - ]: 1 : SelectionResult selection{target, SelectionAlgorithm::MANUAL};
992 : 1 : const CAmount large_fee_diff{90};
993 : 1 : const CAmount target_waste2{-2 * large_fee_diff + change_cost};
994 : : // = (2 * fee) - (2 * (fee + large_fee_diff)) + change_cost
995 : : // = (2 * 100) - (2 * (100 + 90)) + 125
996 : : // = 200 - 380 + 125 = -55
997 : 1 : assert(target_waste2 == -55);
998 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, fee, fee + large_fee_diff);
999 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee + large_fee_diff);
1000 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
1001 [ + - + - : 1 : BOOST_CHECK_EQUAL(target_waste2, selection.GetWaste());
+ - ]
1002 : 1 : }
1003 : 1 : }
1004 : :
1005 : :
1006 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(bump_fee_test)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
1007 : : {
1008 : 1 : const CAmount fee{100};
1009 : 1 : const CAmount min_viable_change{200};
1010 : 1 : const CAmount change_cost{125};
1011 : 1 : const CAmount change_fee{35};
1012 : 1 : const CAmount fee_diff{40};
1013 : 1 : const CAmount target{2 * COIN};
1014 : :
1015 : 1 : {
1016 [ + - ]: 1 : SelectionResult selection{target, SelectionAlgorithm::MANUAL};
1017 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, /*fee=*/fee, /*long_term_fee=*/fee + fee_diff);
1018 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee + fee_diff);
1019 [ + - ]: 1 : const std::vector<std::shared_ptr<COutput>> inputs = selection.GetShuffledInputVector();
1020 : :
1021 [ + + ]: 3 : for (size_t i = 0; i < inputs.size(); ++i) {
1022 : 2 : inputs[i]->ApplyBumpFee(20*(i+1));
1023 : : }
1024 : :
1025 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
1026 : 1 : CAmount expected_waste = fee_diff * -2 + change_cost + /*bump_fees=*/60;
1027 [ + - + - : 1 : BOOST_CHECK_EQUAL(expected_waste, selection.GetWaste());
+ - ]
1028 : :
1029 [ + - ]: 1 : selection.SetBumpFeeDiscount(30);
1030 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
1031 : 1 : expected_waste = fee_diff * -2 + change_cost + /*bump_fees=*/60 - /*group_discount=*/30;
1032 [ + - + - : 1 : BOOST_CHECK_EQUAL(expected_waste, selection.GetWaste());
+ - ]
1033 : 1 : }
1034 : :
1035 : 1 : {
1036 : : // Test with changeless transaction
1037 : : //
1038 : : // Bump fees and excess both contribute fully to the waste score,
1039 : : // therefore, a bump fee group discount will not change the waste
1040 : : // score as long as we do not create change in both instances.
1041 : 1 : CAmount changeless_target = 3 * COIN - 2 * fee - 100;
1042 [ + - ]: 1 : SelectionResult selection{changeless_target, SelectionAlgorithm::MANUAL};
1043 [ + - ]: 1 : add_coin(1 * COIN, 1, selection, /*fee=*/fee, /*long_term_fee=*/fee + fee_diff);
1044 [ + - ]: 1 : add_coin(2 * COIN, 2, selection, fee, fee + fee_diff);
1045 [ + - ]: 1 : const std::vector<std::shared_ptr<COutput>> inputs = selection.GetShuffledInputVector();
1046 : :
1047 [ + + ]: 3 : for (size_t i = 0; i < inputs.size(); ++i) {
1048 : 2 : inputs[i]->ApplyBumpFee(20*(i+1));
1049 : : }
1050 : :
1051 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
1052 : 1 : CAmount expected_waste = fee_diff * -2 + /*bump_fees=*/60 + /*excess = 100 - bump_fees*/40;
1053 [ + - + - : 1 : BOOST_CHECK_EQUAL(expected_waste, selection.GetWaste());
+ - ]
1054 : :
1055 [ + - ]: 1 : selection.SetBumpFeeDiscount(30);
1056 [ + - ]: 1 : selection.RecalculateWaste(min_viable_change, change_cost, change_fee);
1057 : 1 : expected_waste = fee_diff * -2 + /*bump_fees=*/60 - /*group_discount=*/30 + /*excess = 100 - bump_fees + group_discount*/70;
1058 [ + - + - : 1 : BOOST_CHECK_EQUAL(expected_waste, selection.GetWaste());
+ - ]
1059 : 1 : }
1060 : 1 : }
1061 : :
1062 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(effective_value_test)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
1063 : : {
1064 : 1 : const int input_bytes = 148;
1065 : 1 : const CFeeRate feerate(1000);
1066 : 1 : const CAmount nValue = 10000;
1067 : 1 : const int nInput = 0;
1068 : :
1069 : 1 : CMutableTransaction tx;
1070 [ + - ]: 1 : tx.vout.resize(1);
1071 [ + - ]: 1 : tx.vout[nInput].nValue = nValue;
1072 : :
1073 : : // standard case, pass feerate in constructor
1074 [ + - + - : 1 : COutput output1(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 1, input_bytes, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, feerate);
+ - ]
1075 : 1 : const CAmount expected_ev1 = 9852; // 10000 - 148
1076 [ + - + - ]: 1 : BOOST_CHECK_EQUAL(output1.GetEffectiveValue(), expected_ev1);
1077 : :
1078 : : // input bytes unknown (input_bytes = -1), pass feerate in constructor
1079 [ + - + - : 1 : COutput output2(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 1, /*input_bytes=*/ -1, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, feerate);
+ - ]
1080 [ + - + - ]: 1 : BOOST_CHECK_EQUAL(output2.GetEffectiveValue(), nValue); // The effective value should be equal to the absolute value if input_bytes is -1
1081 : :
1082 : : // negative effective value, pass feerate in constructor
1083 [ + - + - : 1 : COutput output3(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 1, input_bytes, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, CFeeRate(100000));
+ - ]
1084 : 1 : const CAmount expected_ev3 = -4800; // 10000 - 14800
1085 [ + - + - ]: 1 : BOOST_CHECK_EQUAL(output3.GetEffectiveValue(), expected_ev3);
1086 : :
1087 : : // standard case, pass fees in constructor
1088 : 1 : const CAmount fees = 148;
1089 [ + - + - : 1 : COutput output4(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 1, input_bytes, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, fees);
+ - ]
1090 [ + - + - ]: 1 : BOOST_CHECK_EQUAL(output4.GetEffectiveValue(), expected_ev1);
1091 : :
1092 : : // input bytes unknown (input_bytes = -1), pass fees in constructor
1093 [ + - + - : 1 : COutput output5(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 1, /*input_bytes=*/ -1, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, /*fees=*/ 0);
+ - ]
1094 [ + - + - ]: 1 : BOOST_CHECK_EQUAL(output5.GetEffectiveValue(), nValue); // The effective value should be equal to the absolute value if input_bytes is -1
1095 : 2 : }
1096 : :
1097 : 7 : static util::Result<SelectionResult> CoinGrinder(const CAmount& target,
1098 : : const CoinSelectionParams& cs_params,
1099 : : const node::NodeContext& m_node,
1100 : : int max_selection_weight,
1101 : : std::function<CoinsResult(CWallet&)> coin_setup)
1102 : : {
1103 [ + - ]: 7 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
1104 [ + - ]: 7 : CoinEligibilityFilter filter(0, 0, 0); // accept all coins without ancestors
1105 [ + - + - : 14 : Groups group = GroupOutputs(*wallet, coin_setup(*wallet), cs_params, {{filter}})[filter].all_groups;
+ - + - +
- + - ]
1106 [ + - ]: 7 : return CoinGrinder(group.positive_group, target, cs_params.m_min_change_target, max_selection_weight);
1107 [ + - ]: 14 : }
1108 : :
1109 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(coin_grinder_tests)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
1110 : : {
1111 : : // Test Coin Grinder:
1112 : : // 1) Insufficient funds, select all provided coins and fail.
1113 : : // 2) Exceeded max weight, coin selection always surpasses the max allowed weight.
1114 : : // 3) Select coins without surpassing the max weight (some coins surpasses the max allowed weight, some others not)
1115 : : // 4) Test that two less valuable UTXOs with a combined lower weight are preferred over a more valuable heavier UTXO
1116 : : // 5) Test finding a solution in a UTXO pool with mixed weights
1117 : : // 6) Test that the lightest solution among many clones is found
1118 : : // 7) Test that lots of tiny UTXOs can be skipped if they are too heavy while there are enough funds in lookahead
1119 : :
1120 : 1 : FastRandomContext rand;
1121 [ + - ]: 1 : CoinSelectionParams dummy_params{ // Only used to provide the 'avoid_partial' flag.
1122 : : rand,
1123 : : /*change_output_size=*/34,
1124 : : /*change_spend_size=*/68,
1125 : : /*min_change_target=*/CENT,
1126 : 1 : /*effective_feerate=*/CFeeRate(5000),
1127 : 1 : /*long_term_feerate=*/CFeeRate(2000),
1128 [ + - ]: 1 : /*discard_feerate=*/CFeeRate(1000),
1129 : : /*tx_noinputs_size=*/10 + 34, // static header size + output size
1130 : : /*avoid_partial=*/false,
1131 : 1 : };
1132 : :
1133 : 1 : {
1134 : : // #########################################################
1135 : : // 1) Insufficient funds, select all provided coins and fail
1136 : : // #########################################################
1137 : 1 : CAmount target = 49.5L * COIN;
1138 : 1 : int max_selection_weight = 10'000; // high enough to not fail for this reason.
1139 [ + - ]: 2 : const auto& res = CoinGrinder(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1140 : 1 : CoinsResult available_coins;
1141 [ + + ]: 11 : for (int j = 0; j < 10; ++j) {
1142 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(1 * COIN));
1143 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(2 * COIN));
1144 : : }
1145 : 1 : return available_coins;
1146 [ + - ]: 1 : });
1147 [ + - + - : 2 : BOOST_CHECK(!res);
+ - ]
1148 [ + - + - : 3 : BOOST_CHECK(util::ErrorString(res).empty()); // empty means "insufficient funds"
+ - ]
1149 : 0 : }
1150 : :
1151 : 1 : {
1152 : : // ###########################
1153 : : // 2) Test max weight exceeded
1154 : : // ###########################
1155 : 1 : CAmount target = 29.5L * COIN;
1156 : 1 : int max_selection_weight = 3000;
1157 [ + - ]: 2 : const auto& res = CoinGrinder(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1158 : 1 : CoinsResult available_coins;
1159 [ + + ]: 11 : for (int j = 0; j < 10; ++j) {
1160 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(1 * COIN), CFeeRate(5000), 144, false, 0, true);
1161 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(2 * COIN), CFeeRate(5000), 144, false, 0, true);
1162 : : }
1163 : 1 : return available_coins;
1164 [ + - ]: 1 : });
1165 [ + - + - : 2 : BOOST_CHECK(!res);
+ - ]
1166 [ + - + - : 3 : BOOST_CHECK(util::ErrorString(res).original.find("The inputs size exceeds the maximum weight") != std::string::npos);
+ - ]
1167 : 0 : }
1168 : :
1169 : 1 : {
1170 : : // ###############################################################################################################
1171 : : // 3) Test selection when some coins surpass the max allowed weight while others not. --> must find a good solution
1172 : : // ################################################################################################################
1173 : 1 : CAmount target = 25.33L * COIN;
1174 : 1 : int max_selection_weight = 10'000; // WU
1175 [ + - ]: 2 : const auto& res = CoinGrinder(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1176 : 1 : CoinsResult available_coins;
1177 [ + + ]: 61 : for (int j = 0; j < 60; ++j) { // 60 UTXO --> 19,8 BTC total --> 60 × 272 WU = 16320 WU
1178 [ + - ]: 60 : add_coin(available_coins, wallet, CAmount(0.33 * COIN), CFeeRate(5000), 144, false, 0, true);
1179 : : }
1180 [ + + ]: 11 : for (int i = 0; i < 10; i++) { // 10 UTXO --> 20 BTC total --> 10 × 272 WU = 2720 WU
1181 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(2 * COIN), CFeeRate(5000), 144, false, 0, true);
1182 : : }
1183 : 1 : return available_coins;
1184 [ + - ]: 1 : });
1185 [ + - + - : 2 : BOOST_CHECK(res);
+ - ]
1186 : : // Demonstrate how following improvements reduce iteration count and catch any regressions in the future.
1187 : 1 : size_t expected_attempts = 37;
1188 [ + - + - : 2 : BOOST_CHECK_MESSAGE(res->GetSelectionsEvaluated() == expected_attempts, strprintf("Expected %i attempts, but got %i", expected_attempts, res->GetSelectionsEvaluated()));
+ - + - +
- ]
1189 : 0 : }
1190 : :
1191 : 1 : {
1192 : : // #################################################################################################################
1193 : : // 4) Test that two less valuable UTXOs with a combined lower weight are preferred over a more valuable heavier UTXO
1194 : : // #################################################################################################################
1195 : 1 : CAmount target = 1.9L * COIN;
1196 : 1 : int max_selection_weight = 400'000; // WU
1197 [ + - ]: 2 : const auto& res = CoinGrinder(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1198 [ + - ]: 1 : CoinsResult available_coins;
1199 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(2 * COIN), CFeeRate(5000), 144, false, 0, true, 148);
1200 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(1 * COIN), CFeeRate(5000), 144, false, 0, true, 68);
1201 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(1 * COIN), CFeeRate(5000), 144, false, 0, true, 68);
1202 : 1 : return available_coins;
1203 [ + - ]: 1 : });
1204 [ + - ]: 1 : SelectionResult expected_result(CAmount(0), SelectionAlgorithm::CG);
1205 [ + - ]: 1 : add_coin(1 * COIN, 1, expected_result);
1206 [ + - ]: 1 : add_coin(1 * COIN, 2, expected_result);
1207 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *res));
+ - + - ]
1208 : : // Demonstrate how following improvements reduce iteration count and catch any regressions in the future.
1209 : 1 : size_t expected_attempts = 3;
1210 [ + - + - : 2 : BOOST_CHECK_MESSAGE(res->GetSelectionsEvaluated() == expected_attempts, strprintf("Expected %i attempts, but got %i", expected_attempts, res->GetSelectionsEvaluated()));
+ - + - +
- ]
1211 : 1 : }
1212 : :
1213 : 1 : {
1214 : : // ###############################################################################################################
1215 : : // 5) Test finding a solution in a UTXO pool with mixed weights
1216 : : // ################################################################################################################
1217 : 1 : CAmount target = 30L * COIN;
1218 : 1 : int max_selection_weight = 400'000; // WU
1219 [ + - ]: 2 : const auto& res = CoinGrinder(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1220 : 1 : CoinsResult available_coins;
1221 [ + + ]: 6 : for (int j = 0; j < 5; ++j) {
1222 : : // Add heavy coins {3, 6, 9, 12, 15}
1223 [ + - ]: 5 : add_coin(available_coins, wallet, CAmount((3 + 3 * j) * COIN), CFeeRate(5000), 144, false, 0, true, 350);
1224 : : // Add medium coins {2, 5, 8, 11, 14}
1225 [ + - ]: 5 : add_coin(available_coins, wallet, CAmount((2 + 3 * j) * COIN), CFeeRate(5000), 144, false, 0, true, 250);
1226 : : // Add light coins {1, 4, 7, 10, 13}
1227 [ + - ]: 5 : add_coin(available_coins, wallet, CAmount((1 + 3 * j) * COIN), CFeeRate(5000), 144, false, 0, true, 150);
1228 : : }
1229 : 1 : return available_coins;
1230 [ + - ]: 1 : });
1231 [ + - + - : 2 : BOOST_CHECK(res);
+ - ]
1232 [ + - ]: 1 : SelectionResult expected_result(CAmount(0), SelectionAlgorithm::CG);
1233 [ + - ]: 1 : add_coin(14 * COIN, 1, expected_result);
1234 [ + - ]: 1 : add_coin(13 * COIN, 2, expected_result);
1235 [ + - ]: 1 : add_coin(4 * COIN, 3, expected_result);
1236 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *res));
+ - + - ]
1237 : : // Demonstrate how following improvements reduce iteration count and catch any regressions in the future.
1238 : 1 : size_t expected_attempts = 92;
1239 [ + - + - : 2 : BOOST_CHECK_MESSAGE(res->GetSelectionsEvaluated() == expected_attempts, strprintf("Expected %i attempts, but got %i", expected_attempts, res->GetSelectionsEvaluated()));
+ - + - +
- ]
1240 : 1 : }
1241 : :
1242 : 1 : {
1243 : : // #################################################################################################################
1244 : : // 6) Test that the lightest solution among many clones is found
1245 : : // #################################################################################################################
1246 : 1 : CAmount target = 9.9L * COIN;
1247 : 1 : int max_selection_weight = 400'000; // WU
1248 [ + - ]: 2 : const auto& res = CoinGrinder(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1249 [ + - ]: 1 : CoinsResult available_coins;
1250 : : // Expected Result: 4 + 3 + 2 + 1 = 10 BTC at 400 vB
1251 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(4 * COIN), CFeeRate(5000), 144, false, 0, true, 100);
1252 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(3 * COIN), CFeeRate(5000), 144, false, 0, true, 100);
1253 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(2 * COIN), CFeeRate(5000), 144, false, 0, true, 100);
1254 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(1 * COIN), CFeeRate(5000), 144, false, 0, true, 100);
1255 : : // Distracting clones:
1256 [ + + ]: 101 : for (int j = 0; j < 100; ++j) {
1257 [ + - ]: 100 : add_coin(available_coins, wallet, CAmount(8 * COIN), CFeeRate(5000), 144, false, 0, true, 1000);
1258 : : }
1259 [ + + ]: 101 : for (int j = 0; j < 100; ++j) {
1260 [ + - ]: 100 : add_coin(available_coins, wallet, CAmount(7 * COIN), CFeeRate(5000), 144, false, 0, true, 800);
1261 : : }
1262 [ + + ]: 101 : for (int j = 0; j < 100; ++j) {
1263 [ + - ]: 100 : add_coin(available_coins, wallet, CAmount(6 * COIN), CFeeRate(5000), 144, false, 0, true, 600);
1264 : : }
1265 [ + + ]: 101 : for (int j = 0; j < 100; ++j) {
1266 [ + - ]: 100 : add_coin(available_coins, wallet, CAmount(5 * COIN), CFeeRate(5000), 144, false, 0, true, 400);
1267 : : }
1268 : 1 : return available_coins;
1269 [ + - ]: 1 : });
1270 [ + - ]: 1 : SelectionResult expected_result(CAmount(0), SelectionAlgorithm::CG);
1271 [ + - ]: 1 : add_coin(4 * COIN, 0, expected_result);
1272 [ + - ]: 1 : add_coin(3 * COIN, 0, expected_result);
1273 [ + - ]: 1 : add_coin(2 * COIN, 0, expected_result);
1274 [ + - ]: 1 : add_coin(1 * COIN, 0, expected_result);
1275 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *res));
+ - + - ]
1276 : : // Demonstrate how following improvements reduce iteration count and catch any regressions in the future.
1277 : 1 : size_t expected_attempts = 38;
1278 [ + - + - : 2 : BOOST_CHECK_MESSAGE(res->GetSelectionsEvaluated() == expected_attempts, strprintf("Expected %i attempts, but got %i", expected_attempts, res->GetSelectionsEvaluated()));
+ - + - +
- ]
1279 : 1 : }
1280 : :
1281 : 1 : {
1282 : : // #################################################################################################################
1283 : : // 7) Test that lots of tiny UTXOs can be skipped if they are too heavy while there are enough funds in lookahead
1284 : : // #################################################################################################################
1285 : 1 : CAmount target = 1.9L * COIN;
1286 : 1 : int max_selection_weight = 40000; // WU
1287 [ + - ]: 2 : const auto& res = CoinGrinder(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1288 [ + - ]: 1 : CoinsResult available_coins;
1289 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(1.8 * COIN), CFeeRate(5000), 144, false, 0, true, 2500);
1290 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(1 * COIN), CFeeRate(5000), 144, false, 0, true, 1000);
1291 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(1 * COIN), CFeeRate(5000), 144, false, 0, true, 1000);
1292 [ + + ]: 101 : for (int j = 0; j < 100; ++j) {
1293 : : // make a 100 unique coins only differing by one sat
1294 [ + - ]: 100 : add_coin(available_coins, wallet, CAmount(0.01 * COIN + j), CFeeRate(5000), 144, false, 0, true, 110);
1295 : : }
1296 : 1 : return available_coins;
1297 [ + - ]: 1 : });
1298 [ + - ]: 1 : SelectionResult expected_result(CAmount(0), SelectionAlgorithm::CG);
1299 [ + - ]: 1 : add_coin(1 * COIN, 1, expected_result);
1300 [ + - ]: 1 : add_coin(1 * COIN, 2, expected_result);
1301 [ + - + - : 2 : BOOST_CHECK(EquivalentResult(expected_result, *res));
+ - + - ]
1302 : : // Demonstrate how following improvements reduce iteration count and catch any regressions in the future.
1303 : 1 : size_t expected_attempts = 7;
1304 [ + - + - : 2 : BOOST_CHECK_MESSAGE(res->GetSelectionsEvaluated() == expected_attempts, strprintf("Expected %i attempts, but got %i", expected_attempts, res->GetSelectionsEvaluated()));
+ - + - +
- ]
1305 : 1 : }
1306 : 1 : }
1307 : :
1308 : 3 : static util::Result<SelectionResult> SelectCoinsSRD(const CAmount& target,
1309 : : const CoinSelectionParams& cs_params,
1310 : : const node::NodeContext& m_node,
1311 : : int max_selection_weight,
1312 : : std::function<CoinsResult(CWallet&)> coin_setup)
1313 : : {
1314 [ + - ]: 3 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
1315 [ + - ]: 3 : CoinEligibilityFilter filter(0, 0, 0); // accept all coins without ancestors
1316 [ + - + - : 6 : Groups group = GroupOutputs(*wallet, coin_setup(*wallet), cs_params, {{filter}})[filter].all_groups;
+ - + - +
- + - ]
1317 [ + - ]: 3 : return SelectCoinsSRD(group.positive_group, target, cs_params.m_change_fee, cs_params.rng_fast, max_selection_weight);
1318 [ + - ]: 6 : }
1319 : :
1320 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(srd_tests)
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- + - + -
+ - + - +
- ]
1321 : : {
1322 : : // Test SRD:
1323 : : // 1) Insufficient funds, select all provided coins and fail.
1324 : : // 2) Exceeded max weight, coin selection always surpasses the max allowed weight.
1325 : : // 3) Select coins without surpassing the max weight (some coins surpasses the max allowed weight, some others not)
1326 : :
1327 : 1 : FastRandomContext rand;
1328 [ + - ]: 1 : CoinSelectionParams dummy_params{ // Only used to provide the 'avoid_partial' flag.
1329 : : rand,
1330 : : /*change_output_size=*/34,
1331 : : /*change_spend_size=*/68,
1332 : : /*min_change_target=*/CENT,
1333 : 1 : /*effective_feerate=*/CFeeRate(0),
1334 : 1 : /*long_term_feerate=*/CFeeRate(0),
1335 [ + - ]: 1 : /*discard_feerate=*/CFeeRate(0),
1336 : : /*tx_noinputs_size=*/10 + 34, // static header size + output size
1337 : : /*avoid_partial=*/false,
1338 : 1 : };
1339 : :
1340 : 1 : {
1341 : : // #########################################################
1342 : : // 1) Insufficient funds, select all provided coins and fail
1343 : : // #########################################################
1344 : 1 : CAmount target = 49.5L * COIN;
1345 : 1 : int max_selection_weight = 10000; // high enough to not fail for this reason.
1346 [ + - ]: 2 : const auto& res = SelectCoinsSRD(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1347 : 1 : CoinsResult available_coins;
1348 [ + + ]: 11 : for (int j = 0; j < 10; ++j) {
1349 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(1 * COIN));
1350 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(2 * COIN));
1351 : : }
1352 : 1 : return available_coins;
1353 [ + - ]: 1 : });
1354 [ + - + - : 2 : BOOST_CHECK(!res);
+ - ]
1355 [ + - + - : 3 : BOOST_CHECK(util::ErrorString(res).empty()); // empty means "insufficient funds"
+ - ]
1356 : 0 : }
1357 : :
1358 : 1 : {
1359 : : // ###########################
1360 : : // 2) Test max weight exceeded
1361 : : // ###########################
1362 : 1 : CAmount target = 49.5L * COIN;
1363 : 1 : int max_selection_weight = 3000;
1364 [ + - ]: 2 : const auto& res = SelectCoinsSRD(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1365 : 1 : CoinsResult available_coins;
1366 [ + + ]: 11 : for (int j = 0; j < 10; ++j) {
1367 : : /* 10 × 1 BTC + 10 × 2 BTC = 30 BTC. 20 × 272 WU = 5440 WU */
1368 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(1 * COIN), CFeeRate(0), 144, false, 0, true);
1369 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(2 * COIN), CFeeRate(0), 144, false, 0, true);
1370 : : }
1371 : 1 : return available_coins;
1372 [ + - ]: 1 : });
1373 [ + - + - : 2 : BOOST_CHECK(!res);
+ - ]
1374 [ + - + - : 3 : BOOST_CHECK(util::ErrorString(res).original.find("The inputs size exceeds the maximum weight") != std::string::npos);
+ - ]
1375 : 0 : }
1376 : :
1377 : 1 : {
1378 : : // ################################################################################################################
1379 : : // 3) Test selection when some coins surpass the max allowed weight while others not. --> must find a good solution
1380 : : // ################################################################################################################
1381 : 1 : CAmount target = 25.33L * COIN;
1382 : 1 : int max_selection_weight = 10000; // WU
1383 [ + - ]: 2 : const auto& res = SelectCoinsSRD(target, dummy_params, m_node, max_selection_weight, [&](CWallet& wallet) {
1384 : 1 : CoinsResult available_coins;
1385 [ + + ]: 61 : for (int j = 0; j < 60; ++j) { // 60 UTXO --> 19,8 BTC total --> 60 × 272 WU = 16320 WU
1386 [ + - ]: 60 : add_coin(available_coins, wallet, CAmount(0.33 * COIN), CFeeRate(0), 144, false, 0, true);
1387 : : }
1388 [ + + ]: 11 : for (int i = 0; i < 10; i++) { // 10 UTXO --> 20 BTC total --> 10 × 272 WU = 2720 WU
1389 [ + - ]: 10 : add_coin(available_coins, wallet, CAmount(2 * COIN), CFeeRate(0), 144, false, 0, true);
1390 : : }
1391 : 1 : return available_coins;
1392 [ + - ]: 1 : });
1393 [ + - + - ]: 2 : BOOST_CHECK(res);
1394 : 1 : }
1395 : 1 : }
1396 : :
1397 : 3 : static util::Result<SelectionResult> select_coins(const CAmount& target, const CoinSelectionParams& cs_params, const CCoinControl& cc, std::function<CoinsResult(CWallet&)> coin_setup, const node::NodeContext& m_node)
1398 : : {
1399 [ + - ]: 3 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
1400 [ + - ]: 3 : auto available_coins = coin_setup(*wallet);
1401 : :
1402 [ + - ]: 3 : LOCK(wallet->cs_wallet);
1403 : 0 : auto result = SelectCoins(*wallet, available_coins, /*pre_set_inputs=*/ {}, target, cc, cs_params);
1404 [ + + ]: 3 : if (result) {
1405 [ + - + - ]: 2 : const auto signedTxSize = 10 + 34 + 68 * result->GetInputSet().size(); // static header size + output size + inputs size (P2WPKH)
1406 [ + - + - ]: 2 : BOOST_CHECK_LE(signedTxSize * WITNESS_SCALE_FACTOR, MAX_STANDARD_TX_WEIGHT);
1407 : :
1408 [ + - + - : 2 : BOOST_CHECK_GE(result->GetSelectedValue(), target);
+ - ]
1409 : : }
1410 [ + - ]: 3 : return result;
1411 [ + - + - ]: 9 : }
1412 : :
1413 : 3 : static bool has_coin(const CoinSet& set, CAmount amount)
1414 : : {
1415 [ + + ]: 1147 : return std::any_of(set.begin(), set.end(), [&](const auto& coin) { return coin->GetEffectiveValue() == amount; });
1416 : : }
1417 : :
1418 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(check_max_selection_weight)
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1419 : : {
1420 : 1 : const CAmount target = 49.5L * COIN;
1421 : 1 : CCoinControl cc;
1422 : :
1423 : 1 : FastRandomContext rand;
1424 [ + - ]: 1 : CoinSelectionParams cs_params{
1425 : : rand,
1426 : : /*change_output_size=*/34,
1427 : : /*change_spend_size=*/68,
1428 : : /*min_change_target=*/CENT,
1429 : 1 : /*effective_feerate=*/CFeeRate(0),
1430 : 1 : /*long_term_feerate=*/CFeeRate(0),
1431 [ + - ]: 1 : /*discard_feerate=*/CFeeRate(0),
1432 : : /*tx_noinputs_size=*/10 + 34, // static header size + output size
1433 : : /*avoid_partial=*/false,
1434 : 1 : };
1435 : :
1436 : 1 : int max_weight = MAX_STANDARD_TX_WEIGHT - WITNESS_SCALE_FACTOR * (cs_params.tx_noinputs_size + cs_params.change_output_size);
1437 : 1 : {
1438 : : // Scenario 1:
1439 : : // The actor starts with 1x 50.0 BTC and 1515x 0.033 BTC (~100.0 BTC total) unspent outputs
1440 : : // Then tries to spend 49.5 BTC
1441 : : // The 50.0 BTC output should be selected, because the transaction would otherwise be too large
1442 : :
1443 : : // Perform selection
1444 : :
1445 : 0 : const auto result = select_coins(
1446 : 1 : target, cs_params, cc, [&](CWallet& wallet) {
1447 : 1 : CoinsResult available_coins;
1448 [ + + ]: 1516 : for (int j = 0; j < 1515; ++j) {
1449 [ + - ]: 1515 : add_coin(available_coins, wallet, CAmount(0.033 * COIN), CFeeRate(0), 144, false, 0, true);
1450 : : }
1451 : :
1452 [ + - ]: 1 : add_coin(available_coins, wallet, CAmount(50 * COIN), CFeeRate(0), 144, false, 0, true);
1453 : 1 : return available_coins;
1454 : 0 : },
1455 [ + - ]: 1 : m_node);
1456 : :
1457 [ + - + - : 2 : BOOST_CHECK(result);
+ - ]
1458 : : // Verify that the 50 BTC UTXO was selected, and result is below max_weight
1459 [ + - + - : 2 : BOOST_CHECK(has_coin(result->GetInputSet(), CAmount(50 * COIN)));
+ - + - ]
1460 [ + - + - ]: 1 : BOOST_CHECK_LE(result->GetWeight(), max_weight);
1461 : 0 : }
1462 : :
1463 : 1 : {
1464 : : // Scenario 2:
1465 : :
1466 : : // The actor starts with 400x 0.0625 BTC and 2000x 0.025 BTC (75.0 BTC total) unspent outputs
1467 : : // Then tries to spend 49.5 BTC
1468 : : // A combination of coins should be selected, such that the created transaction is not too large
1469 : :
1470 : : // Perform selection
1471 : 0 : const auto result = select_coins(
1472 : 1 : target, cs_params, cc, [&](CWallet& wallet) {
1473 : 1 : CoinsResult available_coins;
1474 [ + + ]: 401 : for (int j = 0; j < 400; ++j) {
1475 [ + - ]: 400 : add_coin(available_coins, wallet, CAmount(0.0625 * COIN), CFeeRate(0), 144, false, 0, true);
1476 : : }
1477 [ + + ]: 2001 : for (int j = 0; j < 2000; ++j) {
1478 [ + - ]: 2000 : add_coin(available_coins, wallet, CAmount(0.025 * COIN), CFeeRate(0), 144, false, 0, true);
1479 : : }
1480 : 1 : return available_coins;
1481 : 0 : },
1482 [ + - ]: 1 : m_node);
1483 : :
1484 [ + - + - : 2 : BOOST_CHECK(has_coin(result->GetInputSet(), CAmount(0.0625 * COIN)));
+ - + - ]
1485 [ + - + - : 2 : BOOST_CHECK(has_coin(result->GetInputSet(), CAmount(0.025 * COIN)));
+ - + - ]
1486 [ + - + - ]: 1 : BOOST_CHECK_LE(result->GetWeight(), max_weight);
1487 : 0 : }
1488 : :
1489 : 1 : {
1490 : : // Scenario 3:
1491 : :
1492 : : // The actor starts with 1515x 0.033 BTC (49.995 BTC total) unspent outputs
1493 : : // No results should be returned, because the transaction would be too large
1494 : :
1495 : : // Perform selection
1496 : 0 : const auto result = select_coins(
1497 : 1 : target, cs_params, cc, [&](CWallet& wallet) {
1498 : 1 : CoinsResult available_coins;
1499 [ + + ]: 1516 : for (int j = 0; j < 1515; ++j) {
1500 [ + - ]: 1515 : add_coin(available_coins, wallet, CAmount(0.033 * COIN), CFeeRate(0), 144, false, 0, true);
1501 : : }
1502 : 1 : return available_coins;
1503 : 0 : },
1504 [ + - ]: 1 : m_node);
1505 : :
1506 : : // No results
1507 : : // 1515 inputs * 68 bytes = 103,020 bytes
1508 : : // 103,020 bytes * 4 = 412,080 weight, which is above the MAX_STANDARD_TX_WEIGHT of 400,000
1509 [ + - + - ]: 2 : BOOST_CHECK(!result);
1510 : 1 : }
1511 : 1 : }
1512 : :
1513 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(SelectCoins_effective_value_test)
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1514 : : {
1515 : : // Test that the effective value is used to check whether preset inputs provide sufficient funds when subtract_fee_outputs is not used.
1516 : : // This test creates a coin whose value is higher than the target but whose effective value is lower than the target.
1517 : : // The coin is selected using coin control, with m_allow_other_inputs = false. SelectCoins should fail due to insufficient funds.
1518 : :
1519 [ + - ]: 1 : std::unique_ptr<CWallet> wallet = NewWallet(m_node);
1520 : :
1521 [ + - ]: 1 : CoinsResult available_coins;
1522 : 1 : {
1523 [ + - + - ]: 1 : std::unique_ptr<CWallet> dummyWallet = NewWallet(m_node, /*wallet_name=*/"dummy");
1524 [ + - ]: 1 : add_coin(available_coins, *dummyWallet, 100000); // 0.001 BTC
1525 : 0 : }
1526 : :
1527 : 1 : CAmount target{99900}; // 0.000999 BTC
1528 : :
1529 : 1 : FastRandomContext rand;
1530 [ + - ]: 1 : CoinSelectionParams cs_params{
1531 : : rand,
1532 : : /*change_output_size=*/34,
1533 : : /*change_spend_size=*/148,
1534 : : /*min_change_target=*/1000,
1535 : 1 : /*effective_feerate=*/CFeeRate(3000),
1536 : 1 : /*long_term_feerate=*/CFeeRate(1000),
1537 [ + - ]: 1 : /*discard_feerate=*/CFeeRate(1000),
1538 : : /*tx_noinputs_size=*/0,
1539 : : /*avoid_partial=*/false,
1540 : 1 : };
1541 [ + - ]: 1 : CCoinControl cc;
1542 : 1 : cc.m_allow_other_inputs = false;
1543 [ + - ]: 2 : COutput output = available_coins.All().at(0);
1544 [ + - ]: 1 : cc.SetInputWeight(output.outpoint, 148);
1545 [ + - + - ]: 1 : cc.Select(output.outpoint).SetTxOut(output.txout);
1546 : :
1547 [ + - ]: 1 : LOCK(wallet->cs_wallet);
1548 [ + - + - : 1 : const auto preset_inputs = *Assert(FetchSelectedInputs(*wallet, cc, cs_params));
+ - ]
1549 [ + - + - : 3 : available_coins.Erase({available_coins.coins[OutputType::BECH32].begin()->outpoint});
+ - + - ]
1550 : :
1551 [ + - ]: 1 : const auto result = SelectCoins(*wallet, available_coins, preset_inputs, target, cc, cs_params);
1552 [ + - + - ]: 2 : BOOST_CHECK(!result);
1553 [ + - + - ]: 3 : }
1554 : :
1555 [ + - + - : 7 : BOOST_FIXTURE_TEST_CASE(wallet_coinsresult_test, BasicTestingSetup)
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1556 : : {
1557 : : // Test case to verify CoinsResult object sanity.
1558 [ + - ]: 1 : CoinsResult available_coins;
1559 : 1 : {
1560 [ + - + - ]: 1 : std::unique_ptr<CWallet> dummyWallet = NewWallet(m_node, /*wallet_name=*/"dummy");
1561 : :
1562 : : // Add some coins to 'available_coins'
1563 [ + + ]: 11 : for (int i=0; i<10; i++) {
1564 [ + - ]: 10 : add_coin(available_coins, *dummyWallet, 1 * COIN);
1565 : : }
1566 : 0 : }
1567 : :
1568 : 1 : {
1569 : : // First test case, check that 'CoinsResult::Erase' function works as expected.
1570 : : // By trying to erase two elements from the 'available_coins' object.
1571 [ + - ]: 1 : std::unordered_set<COutPoint, SaltedOutpointHasher> outs_to_remove;
1572 [ + - ]: 1 : const auto& coins = available_coins.All();
1573 [ + + ]: 3 : for (int i = 0; i < 2; i++) {
1574 [ + - ]: 2 : outs_to_remove.emplace(coins[i].outpoint);
1575 : : }
1576 [ + - ]: 1 : available_coins.Erase(outs_to_remove);
1577 : :
1578 : : // Check that the elements were actually removed.
1579 [ + - ]: 1 : const auto& updated_coins = available_coins.All();
1580 [ + + ]: 3 : for (const auto& out: outs_to_remove) {
1581 [ + - ]: 18 : auto it = std::find_if(updated_coins.begin(), updated_coins.end(), [&out](const COutput &coin) {
1582 [ - + - + : 4 : return coin.outpoint == out;
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- - - -
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1583 : : });
1584 [ + - + - ]: 4 : BOOST_CHECK(it == updated_coins.end());
1585 : : }
1586 : : // And verify that no extra element were removed
1587 [ + - + - : 1 : BOOST_CHECK_EQUAL(available_coins.Size(), 8);
+ - ]
1588 : 1 : }
1589 : 1 : }
1590 : :
1591 : : BOOST_AUTO_TEST_SUITE_END()
1592 : : } // namespace wallet
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