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1 : : // Copyright (c) 2021-2022 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 <algorithm>
6 : : #include <common/args.h>
7 : : #include <common/messages.h>
8 : : #include <common/system.h>
9 : : #include <consensus/amount.h>
10 : : #include <consensus/validation.h>
11 : : #include <interfaces/chain.h>
12 : : #include <node/types.h>
13 : : #include <numeric>
14 : : #include <policy/policy.h>
15 : : #include <primitives/transaction.h>
16 : : #include <script/script.h>
17 : : #include <script/signingprovider.h>
18 : : #include <script/solver.h>
19 : : #include <util/check.h>
20 : : #include <util/moneystr.h>
21 : : #include <util/rbf.h>
22 : : #include <util/trace.h>
23 : : #include <util/translation.h>
24 : : #include <util/transaction_identifier.h>
25 : : #include <wallet/coincontrol.h>
26 : : #include <wallet/fees.h>
27 : : #include <wallet/receive.h>
28 : : #include <wallet/spend.h>
29 : : #include <wallet/transaction.h>
30 : : #include <wallet/wallet.h>
31 : :
32 : : #include <cmath>
33 : :
34 : : using common::StringForFeeReason;
35 : : using common::TransactionErrorString;
36 : : using interfaces::FoundBlock;
37 : : using node::TransactionError;
38 : :
39 : : TRACEPOINT_SEMAPHORE(coin_selection, selected_coins);
40 : : TRACEPOINT_SEMAPHORE(coin_selection, normal_create_tx_internal);
41 : : TRACEPOINT_SEMAPHORE(coin_selection, attempting_aps_create_tx);
42 : : TRACEPOINT_SEMAPHORE(coin_selection, aps_create_tx_internal);
43 : :
44 : : namespace wallet {
45 : : static constexpr size_t OUTPUT_GROUP_MAX_ENTRIES{100};
46 : :
47 : : /** Whether the descriptor represents, directly or not, a witness program. */
48 : 211772 : static bool IsSegwit(const Descriptor& desc) {
49 [ + + ]: 211772 : if (const auto typ = desc.GetOutputType()) return *typ != OutputType::LEGACY;
50 : : return false;
51 : : }
52 : :
53 : : /** Whether to assume ECDSA signatures' will be high-r. */
54 : 200172 : static bool UseMaxSig(const std::optional<CTxIn>& txin, const CCoinControl* coin_control) {
55 : : // Use max sig if watch only inputs were used or if this particular input is an external input
56 : : // to ensure a sufficient fee is attained for the requested feerate.
57 [ + + + + : 200172 : return coin_control && (coin_control->fAllowWatchOnly || (txin && coin_control->IsExternalSelected(txin->prevout)));
+ + + + ]
58 : : }
59 : :
60 : : /** Get the size of an input (in witness units) once it's signed.
61 : : *
62 : : * @param desc The output script descriptor of the coin spent by this input.
63 : : * @param txin Optionally the txin to estimate the size of. Used to determine the size of ECDSA signatures.
64 : : * @param coin_control Information about the context to determine the size of ECDSA signatures.
65 : : * @param tx_is_segwit Whether the transaction has at least a single input spending a segwit coin.
66 : : * @param can_grind_r Whether the signer will be able to grind the R of the signature.
67 : : */
68 : 200186 : static std::optional<int64_t> MaxInputWeight(const Descriptor& desc, const std::optional<CTxIn>& txin,
69 : : const CCoinControl* coin_control, const bool tx_is_segwit,
70 : : const bool can_grind_r) {
71 [ + + + + : 200917 : if (const auto sat_weight = desc.MaxSatisfactionWeight(!can_grind_r || UseMaxSig(txin, coin_control))) {
+ + ]
72 [ + - ]: 200183 : if (const auto elems_count = desc.MaxSatisfactionElems()) {
73 : 200183 : const bool is_segwit = IsSegwit(desc);
74 : : // Account for the size of the scriptsig and the number of elements on the witness stack. Note
75 : : // that if any input in the transaction is spending a witness program, we need to specify the
76 : : // witness stack size for every input regardless of whether it is segwit itself.
77 : : // NOTE: this also works in case of mixed scriptsig-and-witness such as in p2sh-wrapped segwit v0
78 : : // outputs. In this case the size of the scriptsig length will always be one (since the redeemScript
79 : : // is always a push of the witness program in this case, which is smaller than 253 bytes).
80 [ + + + + ]: 200183 : const int64_t scriptsig_len = is_segwit ? 1 : GetSizeOfCompactSize(*sat_weight / WITNESS_SCALE_FACTOR);
81 [ - + + + ]: 200183 : const int64_t witstack_len = is_segwit ? GetSizeOfCompactSize(*elems_count) : (tx_is_segwit ? 1 : 0);
82 : : // previous txid + previous vout + sequence + scriptsig len + witstack size + scriptsig or witness
83 : : // NOTE: sat_weight already accounts for the witness discount accordingly.
84 : 200183 : return (32 + 4 + 4 + scriptsig_len) * WITNESS_SCALE_FACTOR + witstack_len + *sat_weight;
85 : : }
86 : : }
87 : :
88 : 3 : return {};
89 : : }
90 : :
91 : 295394 : int CalculateMaximumSignedInputSize(const CTxOut& txout, const COutPoint outpoint, const SigningProvider* provider, bool can_grind_r, const CCoinControl* coin_control)
92 : : {
93 [ + + ]: 295394 : if (!provider) return -1;
94 : :
95 [ + - ]: 185327 : if (const auto desc = InferDescriptor(txout.scriptPubKey, *provider)) {
96 [ + - + + ]: 370654 : if (const auto weight = MaxInputWeight(*desc, {}, coin_control, true, can_grind_r)) {
97 [ + - ]: 185324 : return static_cast<int>(GetVirtualTransactionSize(*weight, 0, 0));
98 : : }
99 : 185324 : }
100 : :
101 : 3 : return -1;
102 : : }
103 : :
104 : 122282 : int CalculateMaximumSignedInputSize(const CTxOut& txout, const CWallet* wallet, const CCoinControl* coin_control)
105 : : {
106 : 122282 : const std::unique_ptr<SigningProvider> provider = wallet->GetSolvingProvider(txout.scriptPubKey);
107 [ + - + - ]: 244564 : return CalculateMaximumSignedInputSize(txout, COutPoint(), provider.get(), wallet->CanGrindR(), coin_control);
108 : 122282 : }
109 : :
110 : : /** Infer a descriptor for the given output script. */
111 : 26448 : static std::unique_ptr<Descriptor> GetDescriptor(const CWallet* wallet, const CCoinControl* coin_control,
112 : : const CScript script_pubkey)
113 : : {
114 : 26448 : MultiSigningProvider providers;
115 [ + - + + ]: 52840 : for (const auto spkman: wallet->GetScriptPubKeyMans(script_pubkey)) {
116 [ + - + - ]: 26392 : providers.AddProvider(spkman->GetSolvingProvider(script_pubkey));
117 : 0 : }
118 [ + + ]: 26448 : if (coin_control) {
119 [ + - + - : 23851 : providers.AddProvider(std::make_unique<FlatSigningProvider>(coin_control->m_external_provider));
- + ]
120 : : }
121 [ + - ]: 26448 : return InferDescriptor(script_pubkey, providers);
122 : 26448 : }
123 : :
124 : : /** Infer the maximum size of this input after it will be signed. */
125 : 16362 : static std::optional<int64_t> GetSignedTxinWeight(const CWallet* wallet, const CCoinControl* coin_control,
126 : : const CTxIn& txin, const CTxOut& txo, const bool tx_is_segwit,
127 : : const bool can_grind_r)
128 : : {
129 : : // If weight was provided, use that.
130 : 16362 : std::optional<int64_t> weight;
131 [ + + + + ]: 16362 : if (coin_control && (weight = coin_control->GetInputWeight(txin.prevout))) {
132 : 1503 : return weight.value();
133 : : }
134 : :
135 : : // Otherwise, use the maximum satisfaction size provided by the descriptor.
136 [ + - ]: 14859 : std::unique_ptr<Descriptor> desc{GetDescriptor(wallet, coin_control, txo.scriptPubKey)};
137 [ + - + - : 29718 : if (desc) return MaxInputWeight(*desc, {txin}, coin_control, tx_is_segwit, can_grind_r);
+ - ]
138 : :
139 : 0 : return {};
140 : 14859 : }
141 : :
142 : : // txouts needs to be in the order of tx.vin
143 : 3434 : TxSize CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, const std::vector<CTxOut>& txouts, const CCoinControl* coin_control)
144 : : {
145 : : // version + nLockTime + input count + output count
146 [ + + + + ]: 3438 : int64_t weight = (4 + 4 + GetSizeOfCompactSize(tx.vin.size()) + GetSizeOfCompactSize(tx.vout.size())) * WITNESS_SCALE_FACTOR;
147 : : // Whether any input spends a witness program. Necessary to run before the next loop over the
148 : : // inputs in order to accurately compute the compactSize length for the witness data per input.
149 : 3434 : bool is_segwit = std::any_of(txouts.begin(), txouts.end(), [&](const CTxOut& txo) {
150 [ + - ]: 11589 : std::unique_ptr<Descriptor> desc{GetDescriptor(wallet, coin_control, txo.scriptPubKey)};
151 [ + - + - ]: 11589 : if (desc) return IsSegwit(*desc);
152 : : return false;
153 : 11589 : });
154 : : // Segwit marker and flag
155 [ + + ]: 3434 : if (is_segwit) weight += 2;
156 : :
157 : : // Add the size of the transaction outputs.
158 [ + + ]: 46677 : for (const auto& txo : tx.vout) weight += GetSerializeSize(txo) * WITNESS_SCALE_FACTOR;
159 : :
160 : : // Add the size of the transaction inputs as if they were signed.
161 [ + + ]: 19796 : for (uint32_t i = 0; i < txouts.size(); i++) {
162 : 16362 : const auto txin_weight = GetSignedTxinWeight(wallet, coin_control, tx.vin[i], txouts[i], is_segwit, wallet->CanGrindR());
163 [ - + ]: 16362 : if (!txin_weight) return TxSize{-1, -1};
164 [ - + ]: 16362 : assert(*txin_weight > -1);
165 : 16362 : weight += *txin_weight;
166 : : }
167 : :
168 : : // It's ok to use 0 as the number of sigops since we never create any pathological transaction.
169 : 3434 : return TxSize{GetVirtualTransactionSize(weight, 0, 0), weight};
170 : : }
171 : :
172 : 3434 : TxSize CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, const CCoinControl* coin_control)
173 : : {
174 : 3434 : std::vector<CTxOut> txouts;
175 : : // Look up the inputs. The inputs are either in the wallet, or in coin_control.
176 [ + + ]: 19796 : for (const CTxIn& input : tx.vin) {
177 [ + - ]: 16362 : const auto mi = wallet->mapWallet.find(input.prevout.hash);
178 : : // Can not estimate size without knowing the input details
179 [ + + ]: 16362 : if (mi != wallet->mapWallet.end()) {
180 [ - + ]: 16326 : assert(input.prevout.n < mi->second.tx->vout.size());
181 [ + - + - ]: 16326 : txouts.emplace_back(mi->second.tx->vout.at(input.prevout.n));
182 [ + - ]: 36 : } else if (coin_control) {
183 [ + - ]: 36 : const auto& txout{coin_control->GetExternalOutput(input.prevout)};
184 [ - + ]: 36 : if (!txout) return TxSize{-1, -1};
185 [ + - ]: 36 : txouts.emplace_back(*txout);
186 : 36 : } else {
187 : 0 : return TxSize{-1, -1};
188 : : }
189 : : }
190 [ + - ]: 3434 : return CalculateMaximumSignedTxSize(tx, wallet, txouts, coin_control);
191 : 3434 : }
192 : :
193 : 1483 : size_t CoinsResult::Size() const
194 : : {
195 : 1483 : size_t size{0};
196 [ + + ]: 3784 : for (const auto& it : coins) {
197 : 2301 : size += it.second.size();
198 : : }
199 : 1483 : return size;
200 : : }
201 : :
202 : 2661 : std::vector<COutput> CoinsResult::All() const
203 : : {
204 : 2661 : std::vector<COutput> all;
205 [ + - ]: 2661 : all.reserve(coins.size());
206 [ + + ]: 5422 : for (const auto& it : coins) {
207 [ + - ]: 2761 : all.insert(all.end(), it.second.begin(), it.second.end());
208 : : }
209 : 2661 : return all;
210 : 0 : }
211 : :
212 : 707 : void CoinsResult::Clear() {
213 : 707 : coins.clear();
214 : 707 : }
215 : :
216 : 4 : void CoinsResult::Erase(const std::unordered_set<COutPoint, SaltedOutpointHasher>& coins_to_remove)
217 : : {
218 [ + + ]: 8 : for (auto& [type, vec] : coins) {
219 : 4 : auto remove_it = std::remove_if(vec.begin(), vec.end(), [&](const COutput& coin) {
220 : : // remove it if it's on the set
221 [ + + ]: 17 : if (coins_to_remove.count(coin.outpoint) == 0) return false;
222 : :
223 : : // update cached amounts
224 : 5 : total_amount -= coin.txout.nValue;
225 [ + - ]: 5 : if (coin.HasEffectiveValue()) total_effective_amount = *total_effective_amount - coin.GetEffectiveValue();
226 : : return true;
227 : : });
228 : 4 : vec.erase(remove_it, vec.end());
229 : : }
230 : 4 : }
231 : :
232 : 20 : void CoinsResult::Shuffle(FastRandomContext& rng_fast)
233 : : {
234 [ + + ]: 56 : for (auto& it : coins) {
235 : 36 : std::shuffle(it.second.begin(), it.second.end(), rng_fast);
236 : : }
237 : 20 : }
238 : :
239 : 289408 : void CoinsResult::Add(OutputType type, const COutput& out)
240 : : {
241 : 289408 : coins[type].emplace_back(out);
242 : 289408 : total_amount += out.txout.nValue;
243 [ + + ]: 289408 : if (out.HasEffectiveValue()) {
244 [ + - ]: 510558 : total_effective_amount = total_effective_amount.has_value() ?
245 : 510558 : *total_effective_amount + out.GetEffectiveValue() : out.GetEffectiveValue();
246 : : }
247 : 289408 : }
248 : :
249 : 173093 : static OutputType GetOutputType(TxoutType type, bool is_from_p2sh)
250 : : {
251 [ + + + + ]: 173093 : switch (type) {
252 : : case TxoutType::WITNESS_V1_TAPROOT:
253 : : return OutputType::BECH32M;
254 : 130690 : case TxoutType::WITNESS_V0_KEYHASH:
255 : 130690 : case TxoutType::WITNESS_V0_SCRIPTHASH:
256 [ + + ]: 130690 : if (is_from_p2sh) return OutputType::P2SH_SEGWIT;
257 : 116799 : else return OutputType::BECH32;
258 : 39418 : case TxoutType::SCRIPTHASH:
259 : 39418 : case TxoutType::PUBKEYHASH:
260 : 39418 : return OutputType::LEGACY;
261 : 33 : default:
262 : 33 : return OutputType::UNKNOWN;
263 : : }
264 : : }
265 : :
266 : : // Fetch and validate the coin control selected inputs.
267 : : // Coins could be internal (from the wallet) or external.
268 : 453 : util::Result<PreSelectedInputs> FetchSelectedInputs(const CWallet& wallet, const CCoinControl& coin_control,
269 : : const CoinSelectionParams& coin_selection_params)
270 : : {
271 [ + - ]: 453 : PreSelectedInputs result;
272 [ + - ]: 453 : const bool can_grind_r = wallet.CanGrindR();
273 [ + - + - ]: 453 : std::map<COutPoint, CAmount> map_of_bump_fees = wallet.chain().calculateIndividualBumpFees(coin_control.ListSelected(), coin_selection_params.m_effective_feerate);
274 [ + - + + ]: 6083 : for (const COutPoint& outpoint : coin_control.ListSelected()) {
275 [ + - + + ]: 5633 : int64_t input_bytes = coin_control.GetInputWeight(outpoint).value_or(-1);
276 [ + - ]: 2503 : if (input_bytes != -1) {
277 [ + - ]: 2503 : input_bytes = GetVirtualTransactionSize(input_bytes, 0, 0);
278 : : }
279 : 5633 : CTxOut txout;
280 [ + - + + ]: 5633 : if (auto ptr_wtx = wallet.GetWalletTx(outpoint.hash)) {
281 : : // Clearly invalid input, fail
282 [ - + ]: 5593 : if (ptr_wtx->tx->vout.size() <= outpoint.n) {
283 [ # # # # ]: 0 : return util::Error{strprintf(_("Invalid pre-selected input %s"), outpoint.ToString())};
284 : : }
285 [ + - ]: 5593 : txout = ptr_wtx->tx->vout.at(outpoint.n);
286 [ + + ]: 5593 : if (input_bytes == -1) {
287 [ + - ]: 3115 : input_bytes = CalculateMaximumSignedInputSize(txout, &wallet, &coin_control);
288 : : }
289 : : } else {
290 : : // The input is external. We did not find the tx in mapWallet.
291 [ + - ]: 40 : const auto out{coin_control.GetExternalOutput(outpoint)};
292 [ - + ]: 40 : if (!out) {
293 [ # # # # ]: 0 : return util::Error{strprintf(_("Not found pre-selected input %s"), outpoint.ToString())};
294 : : }
295 : :
296 : 40 : txout = *out;
297 : 40 : }
298 : :
299 [ + + ]: 3155 : if (input_bytes == -1) {
300 [ + - ]: 19 : input_bytes = CalculateMaximumSignedInputSize(txout, outpoint, &coin_control.m_external_provider, can_grind_r, &coin_control);
301 : : }
302 : :
303 [ + + ]: 19 : if (input_bytes == -1) {
304 [ + - + - ]: 9 : return util::Error{strprintf(_("Not solvable pre-selected input %s"), outpoint.ToString())}; // Not solvable, can't estimate size for fee
305 : : }
306 : :
307 : : /* Set some defaults for depth, spendable, solvable, safe, time, and from_me as these don't matter for preset inputs since no selection is being done. */
308 [ + - ]: 5630 : COutput output(outpoint, txout, /*depth=*/ 0, input_bytes, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ false, coin_selection_params.m_effective_feerate);
309 [ + - ]: 5630 : output.ApplyBumpFee(map_of_bump_fees.at(output.outpoint));
310 [ + - ]: 5630 : result.Insert(output, coin_selection_params.m_subtract_fee_outputs);
311 : 5633 : }
312 : 450 : return result;
313 : 453 : }
314 : :
315 : 3720 : CoinsResult AvailableCoins(const CWallet& wallet,
316 : : const CCoinControl* coinControl,
317 : : std::optional<CFeeRate> feerate,
318 : : const CoinFilterParams& params)
319 : : {
320 : 3720 : AssertLockHeld(wallet.cs_wallet);
321 : :
322 [ + - ]: 3720 : CoinsResult result;
323 : : // Either the WALLET_FLAG_AVOID_REUSE flag is not set (in which case we always allow), or we default to avoiding, and only in the case where
324 : : // a coin control object is provided, and has the avoid address reuse flag set to false, do we allow already used addresses
325 [ + - + + : 3720 : bool allow_used_addresses = !wallet.IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE) || (coinControl && !coinControl->m_avoid_address_reuse);
+ - + + ]
326 [ + + ]: 3686 : const int min_depth = {coinControl ? coinControl->m_min_depth : DEFAULT_MIN_DEPTH};
327 : 7431 : const int max_depth = {coinControl ? coinControl->m_max_depth : DEFAULT_MAX_DEPTH};
328 [ + + ]: 3711 : const bool only_safe = {coinControl ? !coinControl->m_include_unsafe_inputs : true};
329 [ + - ]: 3720 : const bool can_grind_r = wallet.CanGrindR();
330 : 3720 : std::vector<COutPoint> outpoints;
331 : :
332 : 3720 : std::set<Txid> trusted_parents;
333 [ + + + - ]: 659346 : for (const auto& entry : wallet.mapWallet)
334 : : {
335 : 655626 : const Txid& txid = entry.first;
336 : 655626 : const CWalletTx& wtx = entry.second;
337 : :
338 [ + + + + : 655626 : if (wallet.IsTxImmatureCoinBase(wtx) && !params.include_immature_coinbase)
+ - ]
339 : 220915 : continue;
340 : :
341 [ + - ]: 434711 : int nDepth = wallet.GetTxDepthInMainChain(wtx);
342 [ + + ]: 434711 : if (nDepth < 0)
343 : 4277 : continue;
344 : :
345 : : // We should not consider coins which aren't at least in our mempool
346 : : // It's possible for these to be conflicted via ancestors which we may never be able to detect
347 [ + + + - : 430434 : if (nDepth == 0 && !wtx.InMempool())
+ + ]
348 : 4592 : continue;
349 : :
350 [ + - ]: 425842 : bool safeTx = CachedTxIsTrusted(wallet, wtx, trusted_parents);
351 : :
352 : : // We should not consider coins from transactions that are replacing
353 : : // other transactions.
354 : : //
355 : : // Example: There is a transaction A which is replaced by bumpfee
356 : : // transaction B. In this case, we want to prevent creation of
357 : : // a transaction B' which spends an output of B.
358 : : //
359 : : // Reason: If transaction A were initially confirmed, transactions B
360 : : // and B' would no longer be valid, so the user would have to create
361 : : // a new transaction C to replace B'. However, in the case of a
362 : : // one-block reorg, transactions B' and C might BOTH be accepted,
363 : : // when the user only wanted one of them. Specifically, there could
364 : : // be a 1-block reorg away from the chain where transactions A and C
365 : : // were accepted to another chain where B, B', and C were all
366 : : // accepted.
367 [ + + + - : 496158 : if (nDepth == 0 && wtx.mapValue.count("replaces_txid")) {
+ + + + ]
368 : 148 : safeTx = false;
369 : : }
370 : :
371 : : // Similarly, we should not consider coins from transactions that
372 : : // have been replaced. In the example above, we would want to prevent
373 : : // creation of a transaction A' spending an output of A, because if
374 : : // transaction B were initially confirmed, conflicting with A and
375 : : // A', we wouldn't want to the user to create a transaction D
376 : : // intending to replace A', but potentially resulting in a scenario
377 : : // where A, A', and D could all be accepted (instead of just B and
378 : : // D, or just A and A' like the user would want).
379 [ + + + - : 496158 : if (nDepth == 0 && wtx.mapValue.count("replaced_by_txid")) {
+ + + + ]
380 : 1 : safeTx = false;
381 : : }
382 : :
383 [ + + ]: 425842 : if (only_safe && !safeTx) {
384 : 1963 : continue;
385 : : }
386 : :
387 [ + + ]: 423879 : if (nDepth < min_depth || nDepth > max_depth) {
388 : 3947 : continue;
389 : : }
390 : :
391 [ + - ]: 419932 : bool tx_from_me = CachedTxIsFromMe(wallet, wtx, ISMINE_ALL);
392 : :
393 [ + + ]: 1563558 : for (unsigned int i = 0; i < wtx.tx->vout.size(); i++) {
394 [ + + ]: 1143626 : const CTxOut& output = wtx.tx->vout[i];
395 [ + + ]: 1143626 : const COutPoint outpoint(txid, i);
396 : :
397 [ + + - + ]: 1143626 : if (output.nValue < params.min_amount || output.nValue > params.max_amount)
398 : 153878 : continue;
399 : :
400 : : // Skip manually selected coins (the caller can fetch them directly)
401 [ + + + - : 989748 : if (coinControl && coinControl->HasSelected() && coinControl->IsSelected(outpoint))
+ + + - +
+ ]
402 : 4010 : continue;
403 : :
404 [ + - + + : 985738 : if (wallet.IsLockedCoin(outpoint) && params.skip_locked)
+ + ]
405 : 376 : continue;
406 : :
407 [ + - + + ]: 985362 : if (wallet.IsSpent(outpoint))
408 : 462953 : continue;
409 : :
410 [ + - ]: 522409 : isminetype mine = wallet.IsMine(output);
411 : :
412 [ + + ]: 522409 : if (mine == ISMINE_NO) {
413 : 349316 : continue;
414 : : }
415 : :
416 [ + + + - : 173093 : if (!allow_used_addresses && wallet.IsSpentKey(output.scriptPubKey)) {
+ - ]
417 : 0 : continue;
418 : : }
419 : :
420 [ + - ]: 173093 : std::unique_ptr<SigningProvider> provider = wallet.GetSolvingProvider(output.scriptPubKey);
421 : :
422 [ + - ]: 173093 : int input_bytes = CalculateMaximumSignedInputSize(output, COutPoint(), provider.get(), can_grind_r, coinControl);
423 : : // Because CalculateMaximumSignedInputSize infers a solvable descriptor to get the satisfaction size,
424 : : // it is safe to assume that this input is solvable if input_bytes is greater than -1.
425 : 173093 : bool solvable = input_bytes > -1;
426 [ - + - - : 173093 : bool spendable = ((mine & ISMINE_SPENDABLE) != ISMINE_NO) || (((mine & ISMINE_WATCH_ONLY) != ISMINE_NO) && (coinControl && coinControl->fAllowWatchOnly && solvable));
- - - - -
- ]
427 : :
428 : : // Filter by spendable outputs only
429 [ # # ]: 0 : if (!spendable && params.only_spendable) continue;
430 : :
431 : : // Obtain script type
432 : 173093 : std::vector<std::vector<uint8_t>> script_solutions;
433 [ + - ]: 173093 : TxoutType type = Solver(output.scriptPubKey, script_solutions);
434 : :
435 : : // If the output is P2SH and solvable, we want to know if it is
436 : : // a P2SH (legacy) or one of P2SH-P2WPKH, P2SH-P2WSH (P2SH-Segwit). We can determine
437 : : // this from the redeemScript. If the output is not solvable, it will be classified
438 : : // as a P2SH (legacy), since we have no way of knowing otherwise without the redeemScript
439 : 173093 : bool is_from_p2sh{false};
440 [ + + ]: 173093 : if (type == TxoutType::SCRIPTHASH && solvable) {
441 : 13908 : CScript script;
442 [ + - - + ]: 13908 : if (!provider->GetCScript(CScriptID(uint160(script_solutions[0])), script)) continue;
443 [ + - ]: 13908 : type = Solver(script, script_solutions);
444 : 13908 : is_from_p2sh = true;
445 : 13908 : }
446 : :
447 [ + - ]: 173093 : result.Add(GetOutputType(type, is_from_p2sh),
448 [ + - + - ]: 173093 : COutput(outpoint, output, nDepth, input_bytes, spendable, solvable, safeTx, wtx.GetTxTime(), tx_from_me, feerate));
449 : :
450 [ + - ]: 173093 : outpoints.push_back(outpoint);
451 : :
452 : : // Checks the sum amount of all UTXO's.
453 [ - + ]: 173093 : if (params.min_sum_amount != MAX_MONEY) {
454 [ # # ]: 0 : if (result.GetTotalAmount() >= params.min_sum_amount) {
455 : : return result;
456 : : }
457 : : }
458 : :
459 : : // Checks the maximum number of UTXO's.
460 [ - + - - : 173093 : if (params.max_count > 0 && result.Size() >= params.max_count) {
- - ]
461 : : return result;
462 : : }
463 : 173093 : }
464 : : }
465 : :
466 [ + + ]: 3720 : if (feerate.has_value()) {
467 [ + - ]: 3342 : std::map<COutPoint, CAmount> map_of_bump_fees = wallet.chain().calculateIndividualBumpFees(outpoints, feerate.value());
468 : :
469 [ + + ]: 8488 : for (auto& [_, outputs] : result.coins) {
470 [ + + ]: 144110 : for (auto& output : outputs) {
471 [ + - ]: 138964 : output.ApplyBumpFee(map_of_bump_fees.at(output.outpoint));
472 : : }
473 : : }
474 : 3342 : }
475 : :
476 : : return result;
477 : 3720 : }
478 : :
479 : 368 : CoinsResult AvailableCoinsListUnspent(const CWallet& wallet, const CCoinControl* coinControl, CoinFilterParams params)
480 : : {
481 : 368 : params.only_spendable = false;
482 : 368 : return AvailableCoins(wallet, coinControl, /*feerate=*/ std::nullopt, params);
483 : : }
484 : :
485 : 5 : const CTxOut& FindNonChangeParentOutput(const CWallet& wallet, const COutPoint& outpoint)
486 : : {
487 : 5 : AssertLockHeld(wallet.cs_wallet);
488 : 5 : const CWalletTx* wtx{Assert(wallet.GetWalletTx(outpoint.hash))};
489 : :
490 : 5 : const CTransaction* ptx = wtx->tx.get();
491 : 5 : int n = outpoint.n;
492 [ + - + - ]: 7 : while (OutputIsChange(wallet, ptx->vout[n]) && ptx->vin.size() > 0) {
493 : 7 : const COutPoint& prevout = ptx->vin[0].prevout;
494 : 7 : const CWalletTx* it = wallet.GetWalletTx(prevout.hash);
495 [ + - + - : 9 : if (!it || it->tx->vout.size() <= prevout.n ||
+ + ]
496 : 2 : !wallet.IsMine(it->tx->vout[prevout.n])) {
497 : : break;
498 : : }
499 : 2 : ptx = it->tx.get();
500 : 2 : n = prevout.n;
501 : : }
502 : 5 : return ptx->vout[n];
503 : : }
504 : :
505 : 3 : std::map<CTxDestination, std::vector<COutput>> ListCoins(const CWallet& wallet)
506 : : {
507 : 3 : AssertLockHeld(wallet.cs_wallet);
508 : :
509 [ + - ]: 3 : std::map<CTxDestination, std::vector<COutput>> result;
510 : :
511 [ + - ]: 3 : CCoinControl coin_control;
512 : 3 : CoinFilterParams coins_params;
513 : 3 : coins_params.only_spendable = false;
514 : 3 : coins_params.skip_locked = false;
515 [ + - + - : 8 : for (const COutput& coin : AvailableCoins(wallet, &coin_control, /*feerate=*/std::nullopt, coins_params).All()) {
+ + ]
516 : 5 : CTxDestination address;
517 [ - + - - : 5 : if ((coin.spendable || (wallet.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS) && coin.solvable))) {
- - - - ]
518 [ + - + - : 5 : if (!ExtractDestination(FindNonChangeParentOutput(wallet, coin.outpoint).scriptPubKey, address)) {
+ - ]
519 : : // For backwards compatibility, we convert P2PK output scripts into PKHash destinations
520 [ - + ]: 5 : if (auto pk_dest = std::get_if<PubKeyDestination>(&address)) {
521 [ + - ]: 5 : address = PKHash(pk_dest->GetPubKey());
522 : : } else {
523 : 0 : continue;
524 : : }
525 : : }
526 [ + - + - ]: 5 : result[address].emplace_back(coin);
527 : : }
528 : 8 : }
529 : 3 : return result;
530 : 3 : }
531 : :
532 : 6503 : FilteredOutputGroups GroupOutputs(const CWallet& wallet,
533 : : const CoinsResult& coins,
534 : : const CoinSelectionParams& coin_sel_params,
535 : : const std::vector<SelectionFilter>& filters,
536 : : std::vector<OutputGroup>& ret_discarded_groups)
537 : : {
538 [ + + ]: 6503 : FilteredOutputGroups filtered_groups;
539 : :
540 [ + + ]: 6503 : if (!coin_sel_params.m_avoid_partial_spends) {
541 : : // Allowing partial spends means no grouping. Each COutput gets its own OutputGroup
542 [ + + ]: 10762 : for (const auto& [type, outputs] : coins.coins) {
543 [ + + ]: 522550 : for (const COutput& output : outputs) {
544 : : // Get mempool info
545 : 516804 : size_t ancestors, descendants;
546 [ + - ]: 516804 : wallet.chain().getTransactionAncestry(output.outpoint.hash, ancestors, descendants);
547 : :
548 : : // Create a new group per output and add it to the all groups vector
549 [ + - ]: 516804 : OutputGroup group(coin_sel_params);
550 [ + - + - ]: 516804 : group.Insert(std::make_shared<COutput>(output), ancestors, descendants);
551 : :
552 : : // Each filter maps to a different set of groups
553 : 516804 : bool accepted = false;
554 [ + + ]: 1839178 : for (const auto& sel_filter : filters) {
555 : 1322374 : const auto& filter = sel_filter.filter;
556 [ + - + + ]: 1322374 : if (!group.EligibleForSpending(filter)) continue;
557 [ + - + - ]: 1265379 : filtered_groups[filter].Push(group, type, /*insert_positive=*/true, /*insert_mixed=*/true);
558 : : accepted = true;
559 : : }
560 [ + + + - ]: 516804 : if (!accepted) ret_discarded_groups.emplace_back(group);
561 : 516804 : }
562 : : }
563 : : return filtered_groups;
564 : : }
565 : :
566 : : // We want to combine COutputs that have the same scriptPubKey into single OutputGroups
567 : : // except when there are more than OUTPUT_GROUP_MAX_ENTRIES COutputs grouped in an OutputGroup.
568 : : // To do this, we maintain a map where the key is the scriptPubKey and the value is a vector of OutputGroups.
569 : : // For each COutput, we check if the scriptPubKey is in the map, and if it is, the COutput is added
570 : : // to the last OutputGroup in the vector for the scriptPubKey. When the last OutputGroup has
571 : : // OUTPUT_GROUP_MAX_ENTRIES COutputs, a new OutputGroup is added to the end of the vector.
572 : 1487 : typedef std::map<std::pair<CScript, OutputType>, std::vector<OutputGroup>> ScriptPubKeyToOutgroup;
573 : 121549 : const auto& insert_output = [&](
574 : : const std::shared_ptr<COutput>& output, OutputType type, size_t ancestors, size_t descendants,
575 : : ScriptPubKeyToOutgroup& groups_map) {
576 [ + - ]: 120062 : std::vector<OutputGroup>& groups = groups_map[std::make_pair(output->txout.scriptPubKey,type)];
577 : :
578 [ + + ]: 120062 : if (groups.size() == 0) {
579 : : // No OutputGroups for this scriptPubKey yet, add one
580 : 75610 : groups.emplace_back(coin_sel_params);
581 : : }
582 : :
583 : : // Get the last OutputGroup in the vector so that we can add the COutput to it
584 : : // A pointer is used here so that group can be reassigned later if it is full.
585 : 120062 : OutputGroup* group = &groups.back();
586 : :
587 : : // Check if this OutputGroup is full. We limit to OUTPUT_GROUP_MAX_ENTRIES when using -avoidpartialspends
588 : : // to avoid surprising users with very high fees.
589 [ + + ]: 120062 : if (group->m_outputs.size() >= OUTPUT_GROUP_MAX_ENTRIES) {
590 : : // The last output group is full, add a new group to the vector and use that group for the insertion
591 : 228 : groups.emplace_back(coin_sel_params);
592 : 228 : group = &groups.back();
593 : : }
594 : :
595 : 120062 : group->Insert(output, ancestors, descendants);
596 : 120062 : };
597 : :
598 : 1487 : ScriptPubKeyToOutgroup spk_to_groups_map;
599 : 1487 : ScriptPubKeyToOutgroup spk_to_positive_groups_map;
600 [ + + ]: 3792 : for (const auto& [type, outs] : coins.coins) {
601 [ + + ]: 62345 : for (const COutput& output : outs) {
602 : 60040 : size_t ancestors, descendants;
603 [ + - ]: 60040 : wallet.chain().getTransactionAncestry(output.outpoint.hash, ancestors, descendants);
604 : :
605 [ + - ]: 60040 : const auto& shared_output = std::make_shared<COutput>(output);
606 : : // Filter for positive only before adding the output
607 [ + + ]: 60040 : if (output.GetEffectiveValue() > 0) {
608 [ + - ]: 60022 : insert_output(shared_output, type, ancestors, descendants, spk_to_positive_groups_map);
609 : : }
610 : :
611 : : // 'All' groups
612 [ + - ]: 60040 : insert_output(shared_output, type, ancestors, descendants, spk_to_groups_map);
613 : 60040 : }
614 : : }
615 : :
616 : : // Now we go through the entire maps and pull out the OutputGroups
617 : 4461 : const auto& push_output_groups = [&](const ScriptPubKeyToOutgroup& groups_map, bool positive_only) {
618 [ + + ]: 78584 : for (const auto& [script, groups] : groups_map) {
619 : : // Go through the vector backwards. This allows for the first item we deal with being the partial group.
620 [ + + ]: 151448 : for (auto group_it = groups.rbegin(); group_it != groups.rend(); group_it++) {
621 : 75838 : const OutputGroup& group = *group_it;
622 : :
623 : : // Each filter maps to a different set of groups
624 : 75838 : bool accepted = false;
625 [ + + ]: 530704 : for (const auto& sel_filter : filters) {
626 : 454866 : const auto& filter = sel_filter.filter;
627 [ + + ]: 454866 : if (!group.EligibleForSpending(filter)) continue;
628 : :
629 : : // Don't include partial groups if there are full groups too and we don't want partial groups
630 [ + + + + : 350106 : if (group_it == groups.rbegin() && groups.size() > 1 && !filter.m_include_partial_groups) {
+ + ]
631 : 124 : continue;
632 : : }
633 : :
634 : 349982 : OutputType type = script.second;
635 : : // Either insert the group into the positive-only groups or the mixed ones.
636 : 349982 : filtered_groups[filter].Push(group, type, positive_only, /*insert_mixed=*/!positive_only);
637 : 349982 : accepted = true;
638 : : }
639 [ + + ]: 75838 : if (!accepted) ret_discarded_groups.emplace_back(group);
640 : : }
641 : : }
642 : 4461 : };
643 : :
644 [ + - ]: 1487 : push_output_groups(spk_to_groups_map, /*positive_only=*/ false);
645 [ + - ]: 1487 : push_output_groups(spk_to_positive_groups_map, /*positive_only=*/ true);
646 : :
647 : 1487 : return filtered_groups;
648 : 1487 : }
649 : :
650 : 3427 : FilteredOutputGroups GroupOutputs(const CWallet& wallet,
651 : : const CoinsResult& coins,
652 : : const CoinSelectionParams& params,
653 : : const std::vector<SelectionFilter>& filters)
654 : : {
655 : 3427 : std::vector<OutputGroup> unused;
656 [ + - ]: 6854 : return GroupOutputs(wallet, coins, params, filters, unused);
657 : 3427 : }
658 : :
659 : : // Returns true if the result contains an error and the message is not empty
660 : 11392 : static bool HasErrorMsg(const util::Result<SelectionResult>& res) { return !util::ErrorString(res).empty(); }
661 : :
662 : 3507 : util::Result<SelectionResult> AttemptSelection(interfaces::Chain& chain, const CAmount& nTargetValue, OutputGroupTypeMap& groups,
663 : : const CoinSelectionParams& coin_selection_params, bool allow_mixed_output_types)
664 : : {
665 : : // Run coin selection on each OutputType and compute the Waste Metric
666 : 3507 : std::vector<SelectionResult> results;
667 [ + - + + ]: 8462 : for (auto& [type, group] : groups.groups_by_type) {
668 [ + - ]: 5007 : auto result{ChooseSelectionResult(chain, nTargetValue, group, coin_selection_params)};
669 : : // If any specific error message appears here, then something particularly wrong happened.
670 [ + - + + ]: 5007 : if (HasErrorMsg(result)) return result; // So let's return the specific error.
671 : : // Append the favorable result.
672 [ + + + - ]: 4955 : if (result) results.push_back(*result);
673 : 4955 : }
674 : : // If we have at least one solution for funding the transaction without mixing, choose the minimum one according to waste metric
675 : : // and return the result
676 [ + + + - : 6454 : if (results.size() > 0) return *std::min_element(results.begin(), results.end());
+ - ]
677 : :
678 : : // If we can't fund the transaction from any individual OutputType, run coin selection one last time
679 : : // over all available coins, which would allow mixing.
680 : : // If TypesCount() <= 1, there is nothing to mix.
681 [ + + + + ]: 456 : if (allow_mixed_output_types && groups.TypesCount() > 1) {
682 [ + - ]: 68 : return ChooseSelectionResult(chain, nTargetValue, groups.all_groups, coin_selection_params);
683 : : }
684 : : // Either mixing is not allowed and we couldn't find a solution from any single OutputType, or mixing was allowed and we still couldn't
685 : : // find a solution using all available coins
686 : 776 : return util::Error();
687 : 3507 : };
688 : :
689 : 5075 : util::Result<SelectionResult> ChooseSelectionResult(interfaces::Chain& chain, const CAmount& nTargetValue, Groups& groups, const CoinSelectionParams& coin_selection_params)
690 : : {
691 : : // Vector of results. We will choose the best one based on waste.
692 : 5075 : std::vector<SelectionResult> results;
693 : 5075 : std::vector<util::Result<SelectionResult>> errors;
694 : 11018 : auto append_error = [&] (util::Result<SelectionResult>&& result) {
695 : : // If any specific error message appears here, then something different from a simple "no selection found" happened.
696 : : // Let's save it, so it can be retrieved to the user if no other selection algorithm succeeded.
697 [ + + ]: 5943 : if (HasErrorMsg(result)) {
698 : 91 : errors.emplace_back(std::move(result));
699 : : }
700 : 11018 : };
701 : :
702 : : // Maximum allowed weight for selected coins.
703 [ + + ]: 5075 : int max_transaction_weight = coin_selection_params.m_max_tx_weight.value_or(MAX_STANDARD_TX_WEIGHT);
704 : 5075 : int tx_weight_no_input = coin_selection_params.tx_noinputs_size * WITNESS_SCALE_FACTOR;
705 : 5075 : int max_selection_weight = max_transaction_weight - tx_weight_no_input;
706 [ + + ]: 5075 : if (max_selection_weight <= 0) {
707 [ + - ]: 36 : return util::Error{_("Maximum transaction weight is less than transaction weight without inputs")};
708 : : }
709 : :
710 : : // SFFO frequently causes issues in the context of changeless input sets: skip BnB when SFFO is active
711 [ + + ]: 5063 : if (!coin_selection_params.m_subtract_fee_outputs) {
712 [ + - + + ]: 3621 : if (auto bnb_result{SelectCoinsBnB(groups.positive_group, nTargetValue, coin_selection_params.m_cost_of_change, max_selection_weight)}) {
713 [ + - ]: 114 : results.push_back(*bnb_result);
714 [ + - ]: 7128 : } else append_error(std::move(bnb_result));
715 : : }
716 : :
717 : : // Deduct change weight because remaining Coin Selection algorithms can create change output
718 : 5063 : int change_outputs_weight = coin_selection_params.change_output_size * WITNESS_SCALE_FACTOR;
719 : 5063 : max_selection_weight -= change_outputs_weight;
720 [ + + + - ]: 5063 : if (max_selection_weight < 0 && results.empty()) {
721 [ + - ]: 18 : return util::Error{_("Maximum transaction weight is too low, can not accommodate change output")};
722 : : }
723 : :
724 : : // The knapsack solver has some legacy behavior where it will spend dust outputs. We retain this behavior, so don't filter for positive only here.
725 [ + - + + ]: 5057 : if (auto knapsack_result{KnapsackSolver(groups.mixed_group, nTargetValue, coin_selection_params.m_min_change_target, coin_selection_params.rng_fast, max_selection_weight)}) {
726 [ + - ]: 4032 : results.push_back(*knapsack_result);
727 [ + - ]: 1025 : } else append_error(std::move(knapsack_result));
728 : :
729 [ + + ]: 5057 : if (coin_selection_params.m_effective_feerate > CFeeRate{3 * coin_selection_params.m_long_term_feerate}) { // Minimize input set for feerates of at least 3×LTFRE (default: 30 ṩ/vB+)
730 [ + - + + ]: 812 : if (auto cg_result{CoinGrinder(groups.positive_group, nTargetValue, coin_selection_params.m_min_change_target, max_selection_weight)}) {
731 [ + - ]: 476 : cg_result->RecalculateWaste(coin_selection_params.min_viable_change, coin_selection_params.m_cost_of_change, coin_selection_params.m_change_fee);
732 [ + - ]: 476 : results.push_back(*cg_result);
733 : : } else {
734 [ + - ]: 336 : append_error(std::move(cg_result));
735 : 812 : }
736 : : }
737 : :
738 [ + - + + ]: 5057 : if (auto srd_result{SelectCoinsSRD(groups.positive_group, nTargetValue, coin_selection_params.m_change_fee, coin_selection_params.rng_fast, max_selection_weight)}) {
739 [ + - ]: 3982 : results.push_back(*srd_result);
740 [ + - ]: 1075 : } else append_error(std::move(srd_result));
741 : :
742 [ + + ]: 5057 : if (results.empty()) {
743 : : // No solution found, retrieve the first explicit error (if any).
744 : : // future: add 'severity level' to errors so the worst one can be retrieved instead of the first one.
745 [ + + ]: 2016 : return errors.empty() ? util::Error() : std::move(errors.front());
746 : : }
747 : :
748 : : // If the chosen input set has unconfirmed inputs, check for synergies from overlapping ancestry
749 [ + + ]: 12636 : for (auto& result : results) {
750 : 8604 : std::vector<COutPoint> outpoints;
751 [ + - + - ]: 8604 : std::set<std::shared_ptr<COutput>> coins = result.GetInputSet();
752 : 8604 : CAmount summed_bump_fees = 0;
753 [ + + ]: 175882 : for (auto& coin : coins) {
754 [ + + ]: 167278 : if (coin->depth > 0) continue; // Bump fees only exist for unconfirmed inputs
755 [ + - ]: 1713 : outpoints.push_back(coin->outpoint);
756 : 1713 : summed_bump_fees += coin->ancestor_bump_fees;
757 : : }
758 [ + - ]: 8604 : std::optional<CAmount> combined_bump_fee = chain.calculateCombinedBumpFee(outpoints, coin_selection_params.m_effective_feerate);
759 [ - + ]: 8604 : if (!combined_bump_fee.has_value()) {
760 [ # # ]: 0 : return util::Error{_("Failed to calculate bump fees, because unconfirmed UTXOs depend on enormous cluster of unconfirmed transactions.")};
761 : : }
762 [ + + ]: 8604 : CAmount bump_fee_overestimate = summed_bump_fees - combined_bump_fee.value();
763 [ + + ]: 8604 : if (bump_fee_overestimate) {
764 [ + - ]: 14 : result.SetBumpFeeDiscount(bump_fee_overestimate);
765 : : }
766 [ + - ]: 8604 : result.RecalculateWaste(coin_selection_params.min_viable_change, coin_selection_params.m_cost_of_change, coin_selection_params.m_change_fee);
767 : 8604 : }
768 : :
769 : : // Choose the result with the least waste
770 : : // If the waste is the same, choose the one which spends more inputs.
771 [ + - + - ]: 8064 : return *std::min_element(results.begin(), results.end());
772 : 5075 : }
773 : :
774 : 3457 : util::Result<SelectionResult> SelectCoins(const CWallet& wallet, CoinsResult& available_coins, const PreSelectedInputs& pre_set_inputs,
775 : : const CAmount& nTargetValue, const CCoinControl& coin_control,
776 : : const CoinSelectionParams& coin_selection_params)
777 : : {
778 : : // Deduct preset inputs amount from the search target
779 : 3457 : CAmount selection_target = nTargetValue - pre_set_inputs.total_amount;
780 : :
781 : : // Return if automatic coin selection is disabled, and we don't cover the selection target
782 [ + + + + ]: 3457 : if (!coin_control.m_allow_other_inputs && selection_target > 0) {
783 : 24 : return util::Error{_("The preselected coins total amount does not cover the transaction target. "
784 : 12 : "Please allow other inputs to be automatically selected or include more coins manually")};
785 : : }
786 : :
787 : : // Return if we can cover the target only with the preset inputs
788 [ + + ]: 3445 : if (selection_target <= 0) {
789 [ + - ]: 355 : SelectionResult result(nTargetValue, SelectionAlgorithm::MANUAL);
790 [ + - ]: 355 : result.AddInputs(pre_set_inputs.coins, coin_selection_params.m_subtract_fee_outputs);
791 [ + - ]: 355 : result.RecalculateWaste(coin_selection_params.min_viable_change, coin_selection_params.m_cost_of_change, coin_selection_params.m_change_fee);
792 : 355 : return result;
793 : 355 : }
794 : :
795 : : // Return early if we cannot cover the target with the wallet's UTXO.
796 : : // We use the total effective value if we are not subtracting fee from outputs and 'available_coins' contains the data.
797 [ + + ]: 3090 : CAmount available_coins_total_amount = coin_selection_params.m_subtract_fee_outputs ? available_coins.GetTotalAmount() :
798 [ + - ]: 2470 : (available_coins.GetEffectiveTotalAmount().has_value() ? *available_coins.GetEffectiveTotalAmount() : 0);
799 [ + + ]: 3090 : if (selection_target > available_coins_total_amount) {
800 : 28 : return util::Error(); // Insufficient funds
801 : : }
802 : :
803 : : // Start wallet Coin Selection procedure
804 : 3076 : auto op_selection_result = AutomaticCoinSelection(wallet, available_coins, selection_target, coin_selection_params);
805 [ + + ]: 3076 : if (!op_selection_result) return op_selection_result;
806 : :
807 : : // If needed, add preset inputs to the automatic coin selection result
808 [ + + ]: 3065 : if (!pre_set_inputs.coins.empty()) {
809 [ + - ]: 80 : SelectionResult preselected(pre_set_inputs.total_amount, SelectionAlgorithm::MANUAL);
810 [ + - ]: 80 : preselected.AddInputs(pre_set_inputs.coins, coin_selection_params.m_subtract_fee_outputs);
811 [ + - ]: 80 : op_selection_result->Merge(preselected);
812 : 80 : op_selection_result->RecalculateWaste(coin_selection_params.min_viable_change,
813 : 80 : coin_selection_params.m_cost_of_change,
814 [ + - ]: 80 : coin_selection_params.m_change_fee);
815 : :
816 : : // Verify we haven't exceeded the maximum allowed weight
817 [ + + ]: 80 : int max_inputs_weight = coin_selection_params.m_max_tx_weight.value_or(MAX_STANDARD_TX_WEIGHT) - (coin_selection_params.tx_noinputs_size * WITNESS_SCALE_FACTOR);
818 [ + + ]: 80 : if (op_selection_result->GetWeight() > max_inputs_weight) {
819 [ + - ]: 4 : return util::Error{_("The combination of the pre-selected inputs and the wallet automatic inputs selection exceeds the transaction maximum weight. "
820 : 2 : "Please try sending a smaller amount or manually consolidating your wallet's UTXOs")};
821 : : }
822 : 80 : }
823 : 3063 : return op_selection_result;
824 : 3076 : }
825 : :
826 : 3076 : util::Result<SelectionResult> AutomaticCoinSelection(const CWallet& wallet, CoinsResult& available_coins, const CAmount& value_to_select, const CoinSelectionParams& coin_selection_params)
827 : : {
828 : 3076 : unsigned int limit_ancestor_count = 0;
829 : 3076 : unsigned int limit_descendant_count = 0;
830 : 3076 : wallet.chain().getPackageLimits(limit_ancestor_count, limit_descendant_count);
831 [ - + ]: 3076 : const size_t max_ancestors = (size_t)std::max<int64_t>(1, limit_ancestor_count);
832 [ - + ]: 3076 : const size_t max_descendants = (size_t)std::max<int64_t>(1, limit_descendant_count);
833 [ + - ]: 3076 : const bool fRejectLongChains = gArgs.GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS);
834 : :
835 : : // Cases where we have 101+ outputs all pointing to the same destination may result in
836 : : // privacy leaks as they will potentially be deterministically sorted. We solve that by
837 : : // explicitly shuffling the outputs before processing
838 [ + + + + ]: 3076 : if (coin_selection_params.m_avoid_partial_spends && available_coins.Size() > OUTPUT_GROUP_MAX_ENTRIES) {
839 : 20 : available_coins.Shuffle(coin_selection_params.rng_fast);
840 : : }
841 : :
842 : : // Coin Selection attempts to select inputs from a pool of eligible UTXOs to fund the
843 : : // transaction at a target feerate. If an attempt fails, more attempts may be made using a more
844 : : // permissive CoinEligibilityFilter.
845 : 3076 : {
846 : : // Place coins eligibility filters on a scope increasing order.
847 : 3076 : std::vector<SelectionFilter> ordered_filters{
848 : : // If possible, fund the transaction with confirmed UTXOs only. Prefer at least six
849 : : // confirmations on outputs received from other wallets and only spend confirmed change.
850 : : {CoinEligibilityFilter(1, 6, 0), /*allow_mixed_output_types=*/false},
851 : : {CoinEligibilityFilter(1, 1, 0)},
852 : 3076 : };
853 : : // Fall back to using zero confirmation change (but with as few ancestors in the mempool as
854 : : // possible) if we cannot fund the transaction otherwise.
855 [ + + ]: 3076 : if (wallet.m_spend_zero_conf_change) {
856 [ + - ]: 3074 : ordered_filters.push_back({CoinEligibilityFilter(0, 1, 2)});
857 [ + + + + : 9180 : ordered_filters.push_back({CoinEligibilityFilter(0, 1, std::min(size_t{4}, max_ancestors/3), std::min(size_t{4}, max_descendants/3))});
+ - ]
858 [ + - ]: 3074 : ordered_filters.push_back({CoinEligibilityFilter(0, 1, max_ancestors/2, max_descendants/2)});
859 : : // If partial groups are allowed, relax the requirement of spending OutputGroups (groups
860 : : // of UTXOs sent to the same address, which are obviously controlled by a single wallet)
861 : : // in their entirety.
862 [ + - ]: 3074 : ordered_filters.push_back({CoinEligibilityFilter(0, 1, max_ancestors-1, max_descendants-1, /*include_partial=*/true)});
863 : : // Try with unsafe inputs if they are allowed. This may spend unconfirmed outputs
864 : : // received from other wallets.
865 [ + + ]: 3074 : if (coin_selection_params.m_include_unsafe_inputs) {
866 [ + - ]: 7 : ordered_filters.push_back({CoinEligibilityFilter(/*conf_mine=*/0, /*conf_theirs*/0, max_ancestors-1, max_descendants-1, /*include_partial=*/true)});
867 : : }
868 : : // Try with unlimited ancestors/descendants. The transaction will still need to meet
869 : : // mempool ancestor/descendant policy to be accepted to mempool and broadcasted, but
870 : : // OutputGroups use heuristics that may overestimate ancestor/descendant counts.
871 [ + + ]: 3074 : if (!fRejectLongChains) {
872 [ + - ]: 58 : ordered_filters.push_back({CoinEligibilityFilter(0, 1, std::numeric_limits<uint64_t>::max(),
873 : : std::numeric_limits<uint64_t>::max(),
874 : : /*include_partial=*/true)});
875 : : }
876 : : }
877 : :
878 : : // Group outputs and map them by coin eligibility filter
879 : 3076 : std::vector<OutputGroup> discarded_groups;
880 [ + - ]: 3076 : FilteredOutputGroups filtered_groups = GroupOutputs(wallet, available_coins, coin_selection_params, ordered_filters, discarded_groups);
881 : :
882 : : // Check if we still have enough balance after applying filters (some coins might be discarded)
883 : 3076 : CAmount total_discarded = 0;
884 : 3076 : CAmount total_unconf_long_chain = 0;
885 [ + + ]: 3106 : for (const auto& group : discarded_groups) {
886 [ + - ]: 30 : total_discarded += group.GetSelectionAmount();
887 [ + + + + : 30 : if (group.m_ancestors >= max_ancestors || group.m_descendants >= max_descendants) total_unconf_long_chain += group.GetSelectionAmount();
+ - ]
888 : : }
889 : :
890 [ + + ]: 3076 : if (CAmount total_amount = available_coins.GetTotalAmount() - total_discarded < value_to_select) {
891 : : // Special case, too-long-mempool cluster.
892 [ + + ]: 2 : if (total_amount + total_unconf_long_chain > value_to_select) {
893 [ + - ]: 3 : return util::Error{_("Unconfirmed UTXOs are available, but spending them creates a chain of transactions that will be rejected by the mempool")};
894 : : }
895 : 2 : return util::Error{}; // General "Insufficient Funds"
896 : : }
897 : :
898 : : // Walk-through the filters until the solution gets found.
899 : : // If no solution is found, return the first detailed error (if any).
900 : : // future: add "error level" so the worst one can be picked instead.
901 : 3074 : std::vector<util::Result<SelectionResult>> res_detailed_errors;
902 [ + + ]: 5207 : for (const auto& select_filter : ordered_filters) {
903 : 5198 : auto it = filtered_groups.find(select_filter.filter);
904 [ + + ]: 5198 : if (it == filtered_groups.end()) continue;
905 : 7014 : if (auto res{AttemptSelection(wallet.chain(), value_to_select, it->second,
906 [ + - + + ]: 3507 : coin_selection_params, select_filter.allow_mixed_output_types)}) {
907 : 3065 : return res; // result found
908 : : } else {
909 : : // If any specific error message appears here, then something particularly wrong might have happened.
910 : : // Save the error and continue the selection process. So if no solutions gets found, we can return
911 : : // the detailed error to the upper layers.
912 [ + - + + : 442 : if (HasErrorMsg(res)) res_detailed_errors.emplace_back(std::move(res));
+ - ]
913 : 3507 : }
914 : : }
915 : :
916 : : // Return right away if we have a detailed error
917 [ + - ]: 9 : if (!res_detailed_errors.empty()) return std::move(res_detailed_errors.front());
918 : :
919 : :
920 : : // General "Insufficient Funds"
921 : 0 : return util::Error{};
922 : 6150 : }
923 : : }
924 : :
925 : 2606 : static bool IsCurrentForAntiFeeSniping(interfaces::Chain& chain, const uint256& block_hash)
926 : : {
927 [ + - ]: 2606 : if (chain.isInitialBlockDownload()) {
928 : : return false;
929 : : }
930 : 2606 : constexpr int64_t MAX_ANTI_FEE_SNIPING_TIP_AGE = 8 * 60 * 60; // in seconds
931 : 2606 : int64_t block_time;
932 : 2606 : CHECK_NONFATAL(chain.findBlock(block_hash, FoundBlock().time(block_time)));
933 [ + + ]: 2606 : if (block_time < (GetTime() - MAX_ANTI_FEE_SNIPING_TIP_AGE)) {
934 : 8 : return false;
935 : : }
936 : : return true;
937 : : }
938 : :
939 : : /**
940 : : * Set a height-based locktime for new transactions (uses the height of the
941 : : * current chain tip unless we are not synced with the current chain
942 : : */
943 : 2606 : static void DiscourageFeeSniping(CMutableTransaction& tx, FastRandomContext& rng_fast,
944 : : interfaces::Chain& chain, const uint256& block_hash, int block_height)
945 : : {
946 : : // All inputs must be added by now
947 [ - + ]: 2606 : assert(!tx.vin.empty());
948 : : // Discourage fee sniping.
949 : : //
950 : : // For a large miner the value of the transactions in the best block and
951 : : // the mempool can exceed the cost of deliberately attempting to mine two
952 : : // blocks to orphan the current best block. By setting nLockTime such that
953 : : // only the next block can include the transaction, we discourage this
954 : : // practice as the height restricted and limited blocksize gives miners
955 : : // considering fee sniping fewer options for pulling off this attack.
956 : : //
957 : : // A simple way to think about this is from the wallet's point of view we
958 : : // always want the blockchain to move forward. By setting nLockTime this
959 : : // way we're basically making the statement that we only want this
960 : : // transaction to appear in the next block; we don't want to potentially
961 : : // encourage reorgs by allowing transactions to appear at lower heights
962 : : // than the next block in forks of the best chain.
963 : : //
964 : : // Of course, the subsidy is high enough, and transaction volume low
965 : : // enough, that fee sniping isn't a problem yet, but by implementing a fix
966 : : // now we ensure code won't be written that makes assumptions about
967 : : // nLockTime that preclude a fix later.
968 [ + + ]: 2606 : if (IsCurrentForAntiFeeSniping(chain, block_hash)) {
969 : 2598 : tx.nLockTime = block_height;
970 : :
971 : : // Secondly occasionally randomly pick a nLockTime even further back, so
972 : : // that transactions that are delayed after signing for whatever reason,
973 : : // e.g. high-latency mix networks and some CoinJoin implementations, have
974 : : // better privacy.
975 [ + + ]: 5196 : if (rng_fast.randrange(10) == 0) {
976 [ - + ]: 500 : tx.nLockTime = std::max(0, int(tx.nLockTime) - int(rng_fast.randrange(100)));
977 : : }
978 : : } else {
979 : : // If our chain is lagging behind, we can't discourage fee sniping nor help
980 : : // the privacy of high-latency transactions. To avoid leaking a potentially
981 : : // unique "nLockTime fingerprint", set nLockTime to a constant.
982 : 8 : tx.nLockTime = 0;
983 : : }
984 : : // Sanity check all values
985 [ - + ]: 2606 : assert(tx.nLockTime < LOCKTIME_THRESHOLD); // Type must be block height
986 [ - + ]: 2606 : assert(tx.nLockTime <= uint64_t(block_height));
987 [ + + ]: 11218 : for (const auto& in : tx.vin) {
988 : : // Can not be FINAL for locktime to work
989 [ - + ]: 8612 : assert(in.nSequence != CTxIn::SEQUENCE_FINAL);
990 : : // May be MAX NONFINAL to disable both BIP68 and BIP125
991 [ + + ]: 8612 : if (in.nSequence == CTxIn::MAX_SEQUENCE_NONFINAL) continue;
992 : : // May be MAX BIP125 to disable BIP68 and enable BIP125
993 [ + - ]: 8405 : if (in.nSequence == MAX_BIP125_RBF_SEQUENCE) continue;
994 : : // The wallet does not support any other sequence-use right now.
995 : 0 : assert(false);
996 : : }
997 : 2606 : }
998 : :
999 : 39913 : size_t GetSerializeSizeForRecipient(const CRecipient& recipient)
1000 : : {
1001 [ + - ]: 39913 : return ::GetSerializeSize(CTxOut(recipient.nAmount, GetScriptForDestination(recipient.dest)));
1002 : : }
1003 : :
1004 : 39913 : bool IsDust(const CRecipient& recipient, const CFeeRate& dustRelayFee)
1005 : : {
1006 [ + - + - ]: 39913 : return ::IsDust(CTxOut(recipient.nAmount, GetScriptForDestination(recipient.dest)), dustRelayFee);
1007 : : }
1008 : :
1009 : 3381 : static util::Result<CreatedTransactionResult> CreateTransactionInternal(
1010 : : CWallet& wallet,
1011 : : const std::vector<CRecipient>& vecSend,
1012 : : std::optional<unsigned int> change_pos,
1013 : : const CCoinControl& coin_control,
1014 : : bool sign) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
1015 : : {
1016 : 3381 : AssertLockHeld(wallet.cs_wallet);
1017 : :
1018 : 3381 : FastRandomContext rng_fast;
1019 [ + - ]: 3381 : CMutableTransaction txNew; // The resulting transaction that we make
1020 : :
1021 [ + + ]: 3381 : if (coin_control.m_version) {
1022 : 761 : txNew.version = coin_control.m_version.value();
1023 : : }
1024 : :
1025 [ + + ]: 3381 : CoinSelectionParams coin_selection_params{rng_fast}; // Parameters for coin selection, init with dummy
1026 : 3381 : coin_selection_params.m_avoid_partial_spends = coin_control.m_avoid_partial_spends;
1027 : 3381 : coin_selection_params.m_include_unsafe_inputs = coin_control.m_include_unsafe_inputs;
1028 [ + + + - ]: 3390 : coin_selection_params.m_max_tx_weight = coin_control.m_max_tx_weight.value_or(MAX_STANDARD_TX_WEIGHT);
1029 : 3381 : int minimum_tx_weight = MIN_STANDARD_TX_NONWITNESS_SIZE * WITNESS_SCALE_FACTOR;
1030 [ + - + + : 3381 : if (coin_selection_params.m_max_tx_weight.value() < minimum_tx_weight || coin_selection_params.m_max_tx_weight.value() > MAX_STANDARD_TX_WEIGHT) {
+ + ]
1031 [ + - ]: 9 : return util::Error{strprintf(_("Maximum transaction weight must be between %d and %d"), minimum_tx_weight, MAX_STANDARD_TX_WEIGHT)};
1032 : : }
1033 : : // Set the long term feerate estimate to the wallet's consolidate feerate
1034 : 3378 : coin_selection_params.m_long_term_feerate = wallet.m_consolidate_feerate;
1035 : : // Static vsize overhead + outputs vsize. 4 nVersion, 4 nLocktime, 1 input count, 1 witness overhead (dummy, flag, stack size)
1036 [ + + ]: 3378 : coin_selection_params.tx_noinputs_size = 10 + GetSizeOfCompactSize(vecSend.size()); // bytes for output count
1037 : :
1038 : 3378 : CAmount recipients_sum = 0;
1039 [ + + + - ]: 3378 : const OutputType change_type = wallet.TransactionChangeType(coin_control.m_change_type ? *coin_control.m_change_type : wallet.m_default_change_type, vecSend);
1040 : 3378 : ReserveDestination reservedest(&wallet, change_type);
1041 : 3378 : unsigned int outputs_to_subtract_fee_from = 0; // The number of outputs which we are subtracting the fee from
1042 [ + + ]: 43291 : for (const auto& recipient : vecSend) {
1043 [ + - + - : 39913 : if (IsDust(recipient, wallet.chain().relayDustFee())) {
- + ]
1044 [ # # ]: 0 : return util::Error{_("Transaction amount too small")};
1045 : : }
1046 : :
1047 : : // Include the fee cost for outputs.
1048 [ + - ]: 39913 : coin_selection_params.tx_noinputs_size += GetSerializeSizeForRecipient(recipient);
1049 : 39913 : recipients_sum += recipient.nAmount;
1050 : :
1051 [ + + ]: 39913 : if (recipient.fSubtractFeeFromAmount) {
1052 : 640 : outputs_to_subtract_fee_from++;
1053 : 640 : coin_selection_params.m_subtract_fee_outputs = true;
1054 : : }
1055 : : }
1056 : :
1057 : : // Create change script that will be used if we need change
1058 : 3378 : CScript scriptChange;
1059 [ + - ]: 3378 : bilingual_str error; // possible error str
1060 : :
1061 : : // coin control: send change to custom address
1062 [ + - ]: 3378 : if (!std::get_if<CNoDestination>(&coin_control.destChange)) {
1063 [ + - ]: 3382 : scriptChange = GetScriptForDestination(coin_control.destChange);
1064 : : } else { // no coin control: send change to newly generated address
1065 : : // Note: We use a new key here to keep it from being obvious which side is the change.
1066 : : // The drawback is that by not reusing a previous key, the change may be lost if a
1067 : : // backup is restored, if the backup doesn't have the new private key for the change.
1068 : : // If we reused the old key, it would be possible to add code to look for and
1069 : : // rediscover unknown transactions that were written with keys of ours to recover
1070 : : // post-backup change.
1071 : :
1072 : : // Reserve a new key pair from key pool. If it fails, provide a dummy
1073 : : // destination in case we don't need change.
1074 : 1687 : CTxDestination dest;
1075 [ + - ]: 1687 : auto op_dest = reservedest.GetReservedDestination(true);
1076 [ + + ]: 1687 : if (!op_dest) {
1077 [ + - + - : 84 : error = _("Transaction needs a change address, but we can't generate it.") + Untranslated(" ") + util::ErrorString(op_dest);
+ - + - ]
1078 : : } else {
1079 [ + - ]: 1673 : dest = *op_dest;
1080 [ + - ]: 3346 : scriptChange = GetScriptForDestination(dest);
1081 : : }
1082 : : // A valid destination implies a change script (and
1083 : : // vice-versa). An empty change script will abort later, if the
1084 : : // change keypool ran out, but change is required.
1085 [ + - + + : 2011 : CHECK_NONFATAL(IsValidDestination(dest) != scriptChange.empty());
+ - ]
1086 : 1687 : }
1087 [ + - ]: 3378 : CTxOut change_prototype_txout(0, scriptChange);
1088 : 3378 : coin_selection_params.change_output_size = GetSerializeSize(change_prototype_txout);
1089 : :
1090 : : // Get size of spending the change output
1091 [ + - ]: 3378 : int change_spend_size = CalculateMaximumSignedInputSize(change_prototype_txout, &wallet, /*coin_control=*/nullptr);
1092 : : // If the wallet doesn't know how to sign change output, assume p2sh-p2wpkh
1093 : : // as lower-bound to allow BnB to do it's thing
1094 [ + + ]: 3378 : if (change_spend_size == -1) {
1095 : 24 : coin_selection_params.change_spend_size = DUMMY_NESTED_P2WPKH_INPUT_SIZE;
1096 : : } else {
1097 : 3354 : coin_selection_params.change_spend_size = change_spend_size;
1098 : : }
1099 : :
1100 : : // Set discard feerate
1101 [ + - ]: 3378 : coin_selection_params.m_discard_feerate = GetDiscardRate(wallet);
1102 : :
1103 : : // Get the fee rate to use effective values in coin selection
1104 : 3378 : FeeCalculation feeCalc;
1105 [ + - ]: 3378 : coin_selection_params.m_effective_feerate = GetMinimumFeeRate(wallet, coin_control, &feeCalc);
1106 : : // Do not, ever, assume that it's fine to change the fee rate if the user has explicitly
1107 : : // provided one
1108 [ + + + + ]: 3378 : if (coin_control.m_feerate && coin_selection_params.m_effective_feerate > *coin_control.m_feerate) {
1109 [ + - + - : 63 : return util::Error{strprintf(_("Fee rate (%s) is lower than the minimum fee rate setting (%s)"), coin_control.m_feerate->ToString(FeeEstimateMode::SAT_VB), coin_selection_params.m_effective_feerate.ToString(FeeEstimateMode::SAT_VB))};
+ - ]
1110 : : }
1111 [ + + + + ]: 3357 : if (feeCalc.reason == FeeReason::FALLBACK && !wallet.m_allow_fallback_fee) {
1112 : : // eventually allow a fallback fee
1113 [ + - ]: 9 : return util::Error{strprintf(_("Fee estimation failed. Fallbackfee is disabled. Wait a few blocks or enable %s."), "-fallbackfee")};
1114 : : }
1115 : :
1116 : : // Calculate the cost of change
1117 : : // Cost of change is the cost of creating the change output + cost of spending the change output in the future.
1118 : : // For creating the change output now, we use the effective feerate.
1119 : : // For spending the change output in the future, we use the discard feerate for now.
1120 : : // So cost of change = (change output size * effective feerate) + (size of spending change output * discard feerate)
1121 [ + - ]: 3354 : coin_selection_params.m_change_fee = coin_selection_params.m_effective_feerate.GetFee(coin_selection_params.change_output_size);
1122 [ + - ]: 3354 : coin_selection_params.m_cost_of_change = coin_selection_params.m_discard_feerate.GetFee(coin_selection_params.change_spend_size) + coin_selection_params.m_change_fee;
1123 : :
1124 [ + - ]: 3354 : coin_selection_params.m_min_change_target = GenerateChangeTarget(std::floor(recipients_sum / vecSend.size()), coin_selection_params.m_change_fee, rng_fast);
1125 : :
1126 : : // The smallest change amount should be:
1127 : : // 1. at least equal to dust threshold
1128 : : // 2. at least 1 sat greater than fees to spend it at m_discard_feerate
1129 [ + - ]: 3354 : const auto dust = GetDustThreshold(change_prototype_txout, coin_selection_params.m_discard_feerate);
1130 [ + - ]: 3354 : const auto change_spend_fee = coin_selection_params.m_discard_feerate.GetFee(coin_selection_params.change_spend_size);
1131 [ + + ]: 3354 : coin_selection_params.min_viable_change = std::max(change_spend_fee + 1, dust);
1132 : :
1133 : : // Include the fees for things that aren't inputs, excluding the change output
1134 [ + + + - ]: 3354 : const CAmount not_input_fees = coin_selection_params.m_effective_feerate.GetFee(coin_selection_params.m_subtract_fee_outputs ? 0 : coin_selection_params.tx_noinputs_size);
1135 : 3354 : CAmount selection_target = recipients_sum + not_input_fees;
1136 : :
1137 : : // This can only happen if feerate is 0, and requested destinations are value of 0 (e.g. OP_RETURN)
1138 : : // and no pre-selected inputs. This will result in 0-input transaction, which is consensus-invalid anyways
1139 [ + + + - : 3354 : if (selection_target == 0 && !coin_control.HasSelected()) {
- + ]
1140 [ + - ]: 3 : return util::Error{_("Transaction requires one destination of non-zero value, a non-zero feerate, or a pre-selected input")};
1141 : : }
1142 : :
1143 : : // Fetch manually selected coins
1144 [ + - ]: 3353 : PreSelectedInputs preset_inputs;
1145 [ + - + + ]: 3353 : if (coin_control.HasSelected()) {
1146 [ + - ]: 452 : auto res_fetch_inputs = FetchSelectedInputs(wallet, coin_control, coin_selection_params);
1147 [ + + + - ]: 458 : if (!res_fetch_inputs) return util::Error{util::ErrorString(res_fetch_inputs)};
1148 [ + - ]: 449 : preset_inputs = *res_fetch_inputs;
1149 : 452 : }
1150 : :
1151 : : // Fetch wallet available coins if "other inputs" are
1152 : : // allowed (coins automatically selected by the wallet)
1153 [ + + ]: 3350 : CoinsResult available_coins;
1154 [ + + ]: 3350 : if (coin_control.m_allow_other_inputs) {
1155 [ + - ]: 6524 : available_coins = AvailableCoins(wallet, &coin_control, coin_selection_params.m_effective_feerate);
1156 : : }
1157 : :
1158 : : // Choose coins to use
1159 [ + - ]: 3350 : auto select_coins_res = SelectCoins(wallet, available_coins, preset_inputs, /*nTargetValue=*/selection_target, coin_control, coin_selection_params);
1160 [ + + ]: 3350 : if (!select_coins_res) {
1161 : : // 'SelectCoins' either returns a specific error message or, if empty, means a general "Insufficient funds".
1162 [ + - ]: 37 : const bilingual_str& err = util::ErrorString(select_coins_res);
1163 [ + + + - : 111 : return util::Error{err.empty() ?_("Insufficient funds") : err};
+ - ]
1164 : 37 : }
1165 : 3313 : const SelectionResult& result = *select_coins_res;
1166 : : TRACEPOINT(coin_selection, selected_coins,
1167 : : wallet.GetName().c_str(),
1168 : : GetAlgorithmName(result.GetAlgo()).c_str(),
1169 : : result.GetTarget(),
1170 : : result.GetWaste(),
1171 : 3313 : result.GetSelectedValue());
1172 : :
1173 : : // vouts to the payees
1174 [ + - ]: 3313 : txNew.vout.reserve(vecSend.size() + 1); // + 1 because of possible later insert
1175 [ + + ]: 43156 : for (const auto& recipient : vecSend)
1176 : : {
1177 [ + - + - ]: 79686 : txNew.vout.emplace_back(recipient.nAmount, GetScriptForDestination(recipient.dest));
1178 : : }
1179 [ + - ]: 3313 : const CAmount change_amount = result.GetChange(coin_selection_params.min_viable_change, coin_selection_params.m_change_fee);
1180 [ + + ]: 3313 : if (change_amount > 0) {
1181 [ + - ]: 3243 : CTxOut newTxOut(change_amount, scriptChange);
1182 [ + + ]: 3243 : if (!change_pos) {
1183 : : // Insert change txn at random position:
1184 : 3175 : change_pos = rng_fast.randrange(txNew.vout.size() + 1);
1185 [ - + ]: 68 : } else if ((unsigned int)*change_pos > txNew.vout.size()) {
1186 [ # # ]: 0 : return util::Error{_("Transaction change output index out of range")};
1187 : : }
1188 [ + - ]: 3243 : txNew.vout.insert(txNew.vout.begin() + *change_pos, newTxOut);
1189 : 3243 : } else {
1190 [ + + ]: 70 : change_pos = std::nullopt;
1191 : : }
1192 : :
1193 : : // Shuffle selected coins and fill in final vin
1194 [ + - ]: 3313 : std::vector<std::shared_ptr<COutput>> selected_coins = result.GetShuffledInputVector();
1195 : :
1196 [ + - + + : 3313 : if (coin_control.HasSelected() && coin_control.HasSelectedOrder()) {
+ + ]
1197 : : // When there are preselected inputs, we need to move them to be the first UTXOs
1198 : : // and have them be in the order selected. We can use stable_sort for this, where we
1199 : : // compare with the positions stored in coin_control. The COutputs that have positions
1200 : : // will be placed before those that don't, and those positions will be in order.
1201 [ + - ]: 430 : std::stable_sort(selected_coins.begin(), selected_coins.end(),
1202 : 15306 : [&coin_control](const std::shared_ptr<COutput>& a, const std::shared_ptr<COutput>& b) {
1203 : 15306 : auto a_pos = coin_control.GetSelectionPos(a->outpoint);
1204 : 15306 : auto b_pos = coin_control.GetSelectionPos(b->outpoint);
1205 [ + + + + ]: 15306 : if (a_pos.has_value() && b_pos.has_value()) {
1206 : 14781 : return a_pos.value() < b_pos.value();
1207 [ + + + - ]: 525 : } else if (a_pos.has_value() && !b_pos.has_value()) {
1208 : 89 : return true;
1209 : : } else {
1210 : : return false;
1211 : : }
1212 : : });
1213 : : }
1214 : :
1215 : : // The sequence number is set to non-maxint so that DiscourageFeeSniping
1216 : : // works.
1217 : : //
1218 : : // BIP125 defines opt-in RBF as any nSequence < maxint-1, so
1219 : : // we use the highest possible value in that range (maxint-2)
1220 : : // to avoid conflicting with other possible uses of nSequence,
1221 : : // and in the spirit of "smallest possible change from prior
1222 : : // behavior."
1223 : 3313 : bool use_anti_fee_sniping = true;
1224 [ + + + + ]: 6626 : const uint32_t default_sequence{coin_control.m_signal_bip125_rbf.value_or(wallet.m_signal_rbf) ? MAX_BIP125_RBF_SEQUENCE : CTxIn::MAX_SEQUENCE_NONFINAL};
1225 [ + - ]: 3313 : txNew.vin.reserve(selected_coins.size());
1226 [ + + ]: 17170 : for (const auto& coin : selected_coins) {
1227 [ + - ]: 13857 : std::optional<uint32_t> sequence = coin_control.GetSequence(coin->outpoint);
1228 [ + + ]: 13857 : if (sequence) {
1229 : : // If an input has a preset sequence, we can't do anti-fee-sniping
1230 : 1757 : use_anti_fee_sniping = false;
1231 : : }
1232 [ + + + - ]: 15614 : txNew.vin.emplace_back(coin->outpoint, CScript{}, sequence.value_or(default_sequence));
1233 : :
1234 [ + - ]: 13857 : auto scripts = coin_control.GetScripts(coin->outpoint);
1235 [ + + ]: 13857 : if (scripts.first) {
1236 : 1757 : txNew.vin.back().scriptSig = *scripts.first;
1237 : : }
1238 [ + + ]: 13857 : if (scripts.second) {
1239 [ + - ]: 13857 : txNew.vin.back().scriptWitness = *scripts.second;
1240 : : }
1241 : 13857 : }
1242 [ + + ]: 3313 : if (coin_control.m_locktime) {
1243 : 707 : txNew.nLockTime = coin_control.m_locktime.value();
1244 : : // If we have a locktime set, we can't use anti-fee-sniping
1245 : 707 : use_anti_fee_sniping = false;
1246 : : }
1247 [ + - ]: 3313 : if (use_anti_fee_sniping) {
1248 [ + - ]: 2606 : DiscourageFeeSniping(txNew, rng_fast, wallet.chain(), wallet.GetLastBlockHash(), wallet.GetLastBlockHeight());
1249 : : }
1250 : :
1251 : : // Calculate the transaction fee
1252 [ + - + - ]: 3313 : TxSize tx_sizes = CalculateMaximumSignedTxSize(CTransaction(txNew), &wallet, &coin_control);
1253 : 3313 : int nBytes = tx_sizes.vsize;
1254 [ - + ]: 3313 : if (nBytes == -1) {
1255 [ # # ]: 0 : return util::Error{_("Missing solving data for estimating transaction size")};
1256 : : }
1257 [ + - + - ]: 3313 : CAmount fee_needed = coin_selection_params.m_effective_feerate.GetFee(nBytes) + result.GetTotalBumpFees();
1258 : 3313 : const CAmount output_value = CalculateOutputValue(txNew);
1259 : 3313 : Assume(recipients_sum + change_amount == output_value);
1260 [ + - ]: 3313 : CAmount current_fee = result.GetSelectedValue() - output_value;
1261 : :
1262 : : // Sanity check that the fee cannot be negative as that means we have more output value than input value
1263 [ - + ]: 3313 : if (current_fee < 0) {
1264 [ # # # # ]: 0 : return util::Error{Untranslated(STR_INTERNAL_BUG("Fee paid < 0"))};
1265 : : }
1266 : :
1267 : : // If there is a change output and we overpay the fees then increase the change to match the fee needed
1268 [ + + + + ]: 3313 : if (change_pos && fee_needed < current_fee) {
1269 [ + - ]: 996 : auto& change = txNew.vout.at(*change_pos);
1270 : 996 : change.nValue += current_fee - fee_needed;
1271 [ + - ]: 996 : current_fee = result.GetSelectedValue() - CalculateOutputValue(txNew);
1272 [ - + ]: 996 : if (fee_needed != current_fee) {
1273 [ # # # # ]: 0 : return util::Error{Untranslated(STR_INTERNAL_BUG("Change adjustment: Fee needed != fee paid"))};
1274 : : }
1275 : : }
1276 : :
1277 : : // Reduce output values for subtractFeeFromAmount
1278 [ + + ]: 3313 : if (coin_selection_params.m_subtract_fee_outputs) {
1279 : 628 : CAmount to_reduce = fee_needed - current_fee;
1280 : 628 : unsigned int i = 0;
1281 : 628 : bool fFirst = true;
1282 [ + + ]: 1267 : for (const auto& recipient : vecSend)
1283 : : {
1284 [ + + + + ]: 640 : if (change_pos && i == *change_pos) {
1285 : 307 : ++i;
1286 : : }
1287 [ + + ]: 640 : CTxOut& txout = txNew.vout[i];
1288 : :
1289 [ + + ]: 640 : if (recipient.fSubtractFeeFromAmount)
1290 : : {
1291 : 638 : txout.nValue -= to_reduce / outputs_to_subtract_fee_from; // Subtract fee equally from each selected recipient
1292 : :
1293 [ + + ]: 638 : if (fFirst) // first receiver pays the remainder not divisible by output count
1294 : : {
1295 : 628 : fFirst = false;
1296 : 628 : txout.nValue -= to_reduce % outputs_to_subtract_fee_from;
1297 : : }
1298 : :
1299 : : // Error if this output is reduced to be below dust
1300 [ + - + - : 638 : if (IsDust(txout, wallet.chain().relayDustFee())) {
+ + ]
1301 [ + - ]: 1 : if (txout.nValue < 0) {
1302 [ + - ]: 3 : return util::Error{_("The transaction amount is too small to pay the fee")};
1303 : : } else {
1304 [ # # ]: 0 : return util::Error{_("The transaction amount is too small to send after the fee has been deducted")};
1305 : : }
1306 : : }
1307 : : }
1308 : 639 : ++i;
1309 : : }
1310 [ + - ]: 627 : current_fee = result.GetSelectedValue() - CalculateOutputValue(txNew);
1311 [ - + ]: 627 : if (fee_needed != current_fee) {
1312 [ # # # # ]: 0 : return util::Error{Untranslated(STR_INTERNAL_BUG("SFFO: Fee needed != fee paid"))};
1313 : : }
1314 : : }
1315 : :
1316 : : // fee_needed should now always be less than or equal to the current fees that we pay.
1317 : : // If it is not, it is a bug.
1318 [ - + ]: 3312 : if (fee_needed > current_fee) {
1319 [ # # # # ]: 0 : return util::Error{Untranslated(STR_INTERNAL_BUG("Fee needed > fee paid"))};
1320 : : }
1321 : :
1322 : : // Give up if change keypool ran out and change is required
1323 [ + + + + : 3962 : if (scriptChange.empty() && change_pos) {
+ + ]
1324 [ + - ]: 6 : return util::Error{error};
1325 : : }
1326 : :
1327 [ + + + - : 3310 : if (sign && !wallet.SignTransaction(txNew)) {
+ - ]
1328 [ # # ]: 0 : return util::Error{_("Signing transaction failed")};
1329 : : }
1330 : :
1331 : : // Return the constructed transaction data.
1332 [ + - ]: 3310 : CTransactionRef tx = MakeTransactionRef(std::move(txNew));
1333 : :
1334 : : // Limit size
1335 [ + + - + ]: 3310 : if ((sign && GetTransactionWeight(*tx) > MAX_STANDARD_TX_WEIGHT) ||
1336 [ + + ]: 918 : (!sign && tx_sizes.weight > MAX_STANDARD_TX_WEIGHT))
1337 : : {
1338 [ + - ]: 6 : return util::Error{_("Transaction too large")};
1339 : : }
1340 : :
1341 [ + + ]: 3308 : if (current_fee > wallet.m_default_max_tx_fee) {
1342 [ + - ]: 57 : return util::Error{TransactionErrorString(TransactionError::MAX_FEE_EXCEEDED)};
1343 : : }
1344 : :
1345 [ + - + - : 3289 : if (gArgs.GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS)) {
+ + ]
1346 : : // Lastly, ensure this tx will pass the mempool's chain limits
1347 [ + - ]: 3227 : auto result = wallet.chain().checkChainLimits(tx);
1348 [ + + ]: 3227 : if (!result) {
1349 [ + - ]: 3 : return util::Error{util::ErrorString(result)};
1350 : : }
1351 : 3227 : }
1352 : :
1353 : : // Before we return success, we assume any change key will be used to prevent
1354 : : // accidental reuse.
1355 [ + - ]: 3288 : reservedest.KeepDestination();
1356 : :
1357 [ + - + - : 3288 : wallet.WalletLogPrintf("Coin Selection: Algorithm:%s, Waste Metric Score:%d\n", GetAlgorithmName(result.GetAlgo()), result.GetWaste());
+ - ]
1358 [ + - ]: 3288 : wallet.WalletLogPrintf("Fee Calculation: Fee:%d Bytes:%u Tgt:%d (requested %d) Reason:\"%s\" Decay %.5f: Estimation: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out) Fail: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out)\n",
1359 : 0 : current_fee, nBytes, feeCalc.returnedTarget, feeCalc.desiredTarget, StringForFeeReason(feeCalc.reason), feeCalc.est.decay,
1360 : : feeCalc.est.pass.start, feeCalc.est.pass.end,
1361 [ + - ]: 3288 : (feeCalc.est.pass.totalConfirmed + feeCalc.est.pass.inMempool + feeCalc.est.pass.leftMempool) > 0.0 ? 100 * feeCalc.est.pass.withinTarget / (feeCalc.est.pass.totalConfirmed + feeCalc.est.pass.inMempool + feeCalc.est.pass.leftMempool) : 0.0,
1362 : : feeCalc.est.pass.withinTarget, feeCalc.est.pass.totalConfirmed, feeCalc.est.pass.inMempool, feeCalc.est.pass.leftMempool,
1363 : : feeCalc.est.fail.start, feeCalc.est.fail.end,
1364 [ + + + + ]: 3288 : (feeCalc.est.fail.totalConfirmed + feeCalc.est.fail.inMempool + feeCalc.est.fail.leftMempool) > 0.0 ? 100 * feeCalc.est.fail.withinTarget / (feeCalc.est.fail.totalConfirmed + feeCalc.est.fail.inMempool + feeCalc.est.fail.leftMempool) : 0.0,
1365 : : feeCalc.est.fail.withinTarget, feeCalc.est.fail.totalConfirmed, feeCalc.est.fail.inMempool, feeCalc.est.fail.leftMempool);
1366 [ + - - + : 9864 : return CreatedTransactionResult(tx, current_fee, change_pos, feeCalc);
+ - ]
1367 : 23531 : }
1368 : :
1369 : 1765 : util::Result<CreatedTransactionResult> CreateTransaction(
1370 : : CWallet& wallet,
1371 : : const std::vector<CRecipient>& vecSend,
1372 : : std::optional<unsigned int> change_pos,
1373 : : const CCoinControl& coin_control,
1374 : : bool sign)
1375 : : {
1376 [ - + ]: 1765 : if (vecSend.empty()) {
1377 : 0 : return util::Error{_("Transaction must have at least one recipient")};
1378 : : }
1379 : :
1380 [ - + - + : 8505 : if (std::any_of(vecSend.cbegin(), vecSend.cend(), [](const auto& recipient){ return recipient.nAmount < 0; })) {
- + - + -
+ - + - +
- + ]
1381 : 0 : return util::Error{_("Transaction amounts must not be negative")};
1382 : : }
1383 : :
1384 : 1765 : LOCK(wallet.cs_wallet);
1385 : :
1386 [ + - ]: 1765 : auto res = CreateTransactionInternal(wallet, vecSend, change_pos, coin_control, sign);
1387 : : TRACEPOINT(coin_selection, normal_create_tx_internal,
1388 : : wallet.GetName().c_str(),
1389 : : bool(res),
1390 : : res ? res->fee : 0,
1391 : 1765 : res && res->change_pos.has_value() ? int32_t(*res->change_pos) : -1);
1392 [ + + ]: 1765 : if (!res) return res;
1393 : 1676 : const auto& txr_ungrouped = *res;
1394 : : // try with avoidpartialspends unless it's enabled already
1395 [ + + + - : 1676 : if (txr_ungrouped.fee > 0 /* 0 means non-functional fee rate estimation */ && wallet.m_max_aps_fee > -1 && !coin_control.m_avoid_partial_spends) {
+ + ]
1396 : 1616 : TRACEPOINT(coin_selection, attempting_aps_create_tx, wallet.GetName().c_str());
1397 [ + - ]: 1616 : CCoinControl tmp_cc = coin_control;
1398 : 1616 : tmp_cc.m_avoid_partial_spends = true;
1399 : :
1400 : : // Reuse the change destination from the first creation attempt to avoid skipping BIP44 indexes
1401 [ + + ]: 1616 : if (txr_ungrouped.change_pos) {
1402 [ + - ]: 1581 : ExtractDestination(txr_ungrouped.tx->vout[*txr_ungrouped.change_pos].scriptPubKey, tmp_cc.destChange);
1403 : : }
1404 : :
1405 [ + - ]: 1616 : auto txr_grouped = CreateTransactionInternal(wallet, vecSend, change_pos, tmp_cc, sign);
1406 : : // if fee of this alternative one is within the range of the max fee, we use this one
1407 [ + + ]: 3228 : const bool use_aps{txr_grouped.has_value() ? (txr_grouped->fee <= txr_ungrouped.fee + wallet.m_max_aps_fee) : false};
1408 : : TRACEPOINT(coin_selection, aps_create_tx_internal,
1409 : : wallet.GetName().c_str(),
1410 : : use_aps,
1411 : : txr_grouped.has_value(),
1412 : : txr_grouped.has_value() ? txr_grouped->fee : 0,
1413 : 1616 : txr_grouped.has_value() && txr_grouped->change_pos.has_value() ? int32_t(*txr_grouped->change_pos) : -1);
1414 [ + + ]: 1616 : if (txr_grouped) {
1415 : 3224 : wallet.WalletLogPrintf("Fee non-grouped = %lld, grouped = %lld, using %s\n",
1416 [ + + + - ]: 1866 : txr_ungrouped.fee, txr_grouped->fee, use_aps ? "grouped" : "non-grouped");
1417 [ + + ]: 1612 : if (use_aps) return txr_grouped;
1418 : : }
1419 : 1616 : }
1420 : 318 : return res;
1421 [ + - ]: 3530 : }
1422 : :
1423 : 428 : util::Result<CreatedTransactionResult> FundTransaction(CWallet& wallet, const CMutableTransaction& tx, const std::vector<CRecipient>& vecSend, std::optional<unsigned int> change_pos, bool lockUnspents, CCoinControl coinControl)
1424 : : {
1425 : : // We want to make sure tx.vout is not used now that we are passing outputs as a vector of recipients.
1426 : : // This sets us up to remove tx completely in a future PR in favor of passing the inputs directly.
1427 [ - + ]: 428 : assert(tx.vout.empty());
1428 : :
1429 : : // Set the user desired locktime
1430 : 428 : coinControl.m_locktime = tx.nLockTime;
1431 : :
1432 : : // Set the user desired version
1433 : 428 : coinControl.m_version = tx.version;
1434 : :
1435 : : // Acquire the locks to prevent races to the new locked unspents between the
1436 : : // CreateTransaction call and LockCoin calls (when lockUnspents is true).
1437 : 428 : LOCK(wallet.cs_wallet);
1438 : :
1439 : : // Fetch specified UTXOs from the UTXO set to get the scriptPubKeys and values of the outputs being selected
1440 : : // and to match with the given solving_data. Only used for non-wallet outputs.
1441 : 428 : std::map<COutPoint, Coin> coins;
1442 [ + + ]: 3093 : for (const CTxIn& txin : tx.vin) {
1443 [ + - ]: 2665 : coins[txin.prevout]; // Create empty map entry keyed by prevout.
1444 : : }
1445 [ + - ]: 428 : wallet.chain().findCoins(coins);
1446 : :
1447 [ + + ]: 3092 : for (const CTxIn& txin : tx.vin) {
1448 : 2665 : const auto& outPoint = txin.prevout;
1449 [ + - ]: 2665 : PreselectedInput& preset_txin = coinControl.Select(outPoint);
1450 [ + - + + ]: 2665 : if (!wallet.IsMine(outPoint)) {
1451 [ + - + + ]: 24 : if (coins[outPoint].out.IsNull()) {
1452 [ + - ]: 3 : return util::Error{_("Unable to find UTXO for external input")};
1453 : : }
1454 : :
1455 : : // The input was not in the wallet, but is in the UTXO set, so select as external
1456 [ + - + - ]: 23 : preset_txin.SetTxOut(coins[outPoint].out);
1457 : : }
1458 [ + - ]: 2664 : preset_txin.SetSequence(txin.nSequence);
1459 [ + - ]: 2664 : preset_txin.SetScriptSig(txin.scriptSig);
1460 [ + - ]: 2664 : preset_txin.SetScriptWitness(txin.scriptWitness);
1461 : : }
1462 : :
1463 [ + - ]: 427 : auto res = CreateTransaction(wallet, vecSend, change_pos, coinControl, false);
1464 [ + + ]: 427 : if (!res) {
1465 : 68 : return res;
1466 : : }
1467 : :
1468 [ + + ]: 359 : if (lockUnspents) {
1469 [ + + ]: 8 : for (const CTxIn& txin : res->tx->vin) {
1470 [ + - ]: 4 : wallet.LockCoin(txin.prevout);
1471 : : }
1472 : : }
1473 : :
1474 : 359 : return res;
1475 [ + - ]: 1283 : }
1476 : : } // namespace wallet
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