1  // Copyright (c) 2018-2022 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 <interfaces/wallet.h>
  6  
  7  #include <common/args.h>
  8  #include <consensus/amount.h>
  9  #include <interfaces/chain.h>
 10  #include <interfaces/handler.h>
 11  #include <policy/fees.h>
 12  #include <primitives/transaction.h>
 13  #include <rpc/server.h>
 14  #include <scheduler.h>
 15  #include <support/allocators/secure.h>
 16  #include <sync.h>
 17  #include <uint256.h>
 18  #include <util/check.h>
 19  #include <util/translation.h>
 20  #include <util/ui_change_type.h>
 21  #include <wallet/coincontrol.h>
 22  #include <wallet/context.h>
 23  #include <wallet/feebumper.h>
 24  #include <wallet/fees.h>
 25  #include <wallet/types.h>
 26  #include <wallet/load.h>
 27  #include <wallet/receive.h>
 28  #include <wallet/rpc/wallet.h>
 29  #include <wallet/spend.h>
 30  #include <wallet/wallet.h>
 31  
 32  #include <memory>
 33  #include <string>
 34  #include <utility>
 35  #include <vector>
 36  
 37  using interfaces::Chain;
 38  using interfaces::FoundBlock;
 39  using interfaces::Handler;
 40  using interfaces::MakeSignalHandler;
 41  using interfaces::Wallet;
 42  using interfaces::WalletAddress;
 43  using interfaces::WalletBalances;
 44  using interfaces::WalletLoader;
 45  using interfaces::WalletMigrationResult;
 46  using interfaces::WalletOrderForm;
 47  using interfaces::WalletTx;
 48  using interfaces::WalletTxOut;
 49  using interfaces::WalletTxStatus;
 50  using interfaces::WalletValueMap;
 51  
 52  namespace wallet {
 53  // All members of the classes in this namespace are intentionally public, as the
 54  // classes themselves are private.
 55  namespace {
 56  //! Construct wallet tx struct.
 57  WalletTx MakeWalletTx(CWallet& wallet, const CWalletTx& wtx)
 58  {
 59      LOCK(wallet.cs_wallet);
 60      WalletTx result;
 61      result.tx = wtx.tx;
 62      result.txin_is_mine.reserve(wtx.tx->vin.size());
 63      for (const auto& txin : wtx.tx->vin) {
 64          result.txin_is_mine.emplace_back(InputIsMine(wallet, txin));
 65      }
 66      result.txout_is_mine.reserve(wtx.tx->vout.size());
 67      result.txout_address.reserve(wtx.tx->vout.size());
 68      result.txout_address_is_mine.reserve(wtx.tx->vout.size());
 69      for (const auto& txout : wtx.tx->vout) {
 70          result.txout_is_mine.emplace_back(wallet.IsMine(txout));
 71          result.txout_is_change.push_back(OutputIsChange(wallet, txout));
 72          result.txout_address.emplace_back();
 73          result.txout_address_is_mine.emplace_back(ExtractDestination(txout.scriptPubKey, result.txout_address.back()) ?
 74                                                        wallet.IsMine(result.txout_address.back()) :
 75                                                        ISMINE_NO);
 76      }
 77      result.credit = CachedTxGetCredit(wallet, wtx, ISMINE_ALL);
 78      result.debit = CachedTxGetDebit(wallet, wtx, ISMINE_ALL);
 79      result.change = CachedTxGetChange(wallet, wtx);
 80      result.time = wtx.GetTxTime();
 81      result.value_map = wtx.mapValue;
 82      result.is_coinbase = wtx.IsCoinBase();
 83      return result;
 84  }
 85  
 86  //! Construct wallet tx status struct.
 87  WalletTxStatus MakeWalletTxStatus(const CWallet& wallet, const CWalletTx& wtx)
 88      EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
 89  {
 90      AssertLockHeld(wallet.cs_wallet);
 91  
 92      WalletTxStatus result;
 93      result.block_height =
 94          wtx.state<TxStateConfirmed>() ? wtx.state<TxStateConfirmed>()->confirmed_block_height :
 95          wtx.state<TxStateBlockConflicted>() ? wtx.state<TxStateBlockConflicted>()->conflicting_block_height :
 96          std::numeric_limits<int>::max();
 97      result.blocks_to_maturity = wallet.GetTxBlocksToMaturity(wtx);
 98      result.depth_in_main_chain = wallet.GetTxDepthInMainChain(wtx);
 99      result.time_received = wtx.nTimeReceived;
100      result.lock_time = wtx.tx->nLockTime;
101      result.is_trusted = CachedTxIsTrusted(wallet, wtx);
102      result.is_abandoned = wtx.isAbandoned();
103      result.is_coinbase = wtx.IsCoinBase();
104      result.is_in_main_chain = wtx.isConfirmed();
105      return result;
106  }
107  
108  //! Construct wallet TxOut struct.
109  WalletTxOut MakeWalletTxOut(const CWallet& wallet,
110      const CWalletTx& wtx,
111      int n,
112      int depth) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
113  {
114      WalletTxOut result;
115      result.txout = wtx.tx->vout[n];
116      result.time = wtx.GetTxTime();
117      result.depth_in_main_chain = depth;
118      result.is_spent = wallet.IsSpent(COutPoint(wtx.GetHash(), n));
119      return result;
120  }
121  
122  WalletTxOut MakeWalletTxOut(const CWallet& wallet,
123      const COutput& output) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
124  {
125      WalletTxOut result;
126      result.txout = output.txout;
127      result.time = output.time;
128      result.depth_in_main_chain = output.depth;
129      result.is_spent = wallet.IsSpent(output.outpoint);
130      return result;
131  }
132  
133  class WalletImpl : public Wallet
134  {
135  public:
136      explicit WalletImpl(WalletContext& context, const std::shared_ptr<CWallet>& wallet) : m_context(context), m_wallet(wallet) {}
137  
138      bool encryptWallet(const SecureString& wallet_passphrase) override
139      {
140          return m_wallet->EncryptWallet(wallet_passphrase);
141      }
142      bool isCrypted() override { return m_wallet->IsCrypted(); }
143      bool lock() override { return m_wallet->Lock(); }
144      bool unlock(const SecureString& wallet_passphrase) override { return m_wallet->Unlock(wallet_passphrase); }
145      bool isLocked() override { return m_wallet->IsLocked(); }
146      bool changeWalletPassphrase(const SecureString& old_wallet_passphrase,
147          const SecureString& new_wallet_passphrase) override
148      {
149          return m_wallet->ChangeWalletPassphrase(old_wallet_passphrase, new_wallet_passphrase);
150      }
151      void abortRescan() override { m_wallet->AbortRescan(); }
152      bool backupWallet(const std::string& filename) override { return m_wallet->BackupWallet(filename); }
153      std::string getWalletName() override { return m_wallet->GetName(); }
154      util::Result<CTxDestination> getNewDestination(const OutputType type, const std::string& label) override
155      {
156          LOCK(m_wallet->cs_wallet);
157          return m_wallet->GetNewDestination(type, label);
158      }
159      bool getPubKey(const CScript& script, const CKeyID& address, CPubKey& pub_key) override
160      {
161          std::unique_ptr<SigningProvider> provider = m_wallet->GetSolvingProvider(script);
162          if (provider) {
163              return provider->GetPubKey(address, pub_key);
164          }
165          return false;
166      }
167      SigningResult signMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) override
168      {
169          return m_wallet->SignMessage(message, pkhash, str_sig);
170      }
171      bool isSpendable(const CTxDestination& dest) override
172      {
173          LOCK(m_wallet->cs_wallet);
174          return m_wallet->IsMine(dest) & ISMINE_SPENDABLE;
175      }
176      bool haveWatchOnly() override
177      {
178          auto spk_man = m_wallet->GetLegacyScriptPubKeyMan();
179          if (spk_man) {
180              return spk_man->HaveWatchOnly();
181          }
182          return false;
183      };
184      bool setAddressBook(const CTxDestination& dest, const std::string& name, const std::optional<AddressPurpose>& purpose) override
185      {
186          return m_wallet->SetAddressBook(dest, name, purpose);
187      }
188      bool delAddressBook(const CTxDestination& dest) override
189      {
190          return m_wallet->DelAddressBook(dest);
191      }
192      bool getAddress(const CTxDestination& dest,
193          std::string* name,
194          isminetype* is_mine,
195          AddressPurpose* purpose) override
196      {
197          LOCK(m_wallet->cs_wallet);
198          const auto& entry = m_wallet->FindAddressBookEntry(dest, /*allow_change=*/false);
199          if (!entry) return false; // addr not found
200          if (name) {
201              *name = entry->GetLabel();
202          }
203          std::optional<isminetype> dest_is_mine;
204          if (is_mine || purpose) {
205              dest_is_mine = m_wallet->IsMine(dest);
206          }
207          if (is_mine) {
208              *is_mine = *dest_is_mine;
209          }
210          if (purpose) {
211              // In very old wallets, address purpose may not be recorded so we derive it from IsMine
212              *purpose = entry->purpose.value_or(*dest_is_mine ? AddressPurpose::RECEIVE : AddressPurpose::SEND);
213          }
214          return true;
215      }
216      std::vector<WalletAddress> getAddresses() override
217      {
218          LOCK(m_wallet->cs_wallet);
219          std::vector<WalletAddress> result;
220          m_wallet->ForEachAddrBookEntry([&](const CTxDestination& dest, const std::string& label, bool is_change, const std::optional<AddressPurpose>& purpose) EXCLUSIVE_LOCKS_REQUIRED(m_wallet->cs_wallet) {
221              if (is_change) return;
222              isminetype is_mine = m_wallet->IsMine(dest);
223              // In very old wallets, address purpose may not be recorded so we derive it from IsMine
224              result.emplace_back(dest, is_mine, purpose.value_or(is_mine ? AddressPurpose::RECEIVE : AddressPurpose::SEND), label);
225          });
226          return result;
227      }
228      std::vector<std::string> getAddressReceiveRequests() override {
229          LOCK(m_wallet->cs_wallet);
230          return m_wallet->GetAddressReceiveRequests();
231      }
232      bool setAddressReceiveRequest(const CTxDestination& dest, const std::string& id, const std::string& value) override {
233          // Note: The setAddressReceiveRequest interface used by the GUI to store
234          // receive requests is a little awkward and could be improved in the
235          // future:
236          //
237          // - The same method is used to save requests and erase them, but
238          //   having separate methods could be clearer and prevent bugs.
239          //
240          // - Request ids are passed as strings even though they are generated as
241          //   integers.
242          //
243          // - Multiple requests can be stored for the same address, but it might
244          //   be better to only allow one request or only keep the current one.
245          LOCK(m_wallet->cs_wallet);
246          WalletBatch batch{m_wallet->GetDatabase()};
247          return value.empty() ? m_wallet->EraseAddressReceiveRequest(batch, dest, id)
248                               : m_wallet->SetAddressReceiveRequest(batch, dest, id, value);
249      }
250      bool displayAddress(const CTxDestination& dest) override
251      {
252          LOCK(m_wallet->cs_wallet);
253          return m_wallet->DisplayAddress(dest);
254      }
255      bool lockCoin(const COutPoint& output, const bool write_to_db) override
256      {
257          LOCK(m_wallet->cs_wallet);
258          std::unique_ptr<WalletBatch> batch = write_to_db ? std::make_unique<WalletBatch>(m_wallet->GetDatabase()) : nullptr;
259          return m_wallet->LockCoin(output, batch.get());
260      }
261      bool unlockCoin(const COutPoint& output) override
262      {
263          LOCK(m_wallet->cs_wallet);
264          std::unique_ptr<WalletBatch> batch = std::make_unique<WalletBatch>(m_wallet->GetDatabase());
265          return m_wallet->UnlockCoin(output, batch.get());
266      }
267      bool isLockedCoin(const COutPoint& output) override
268      {
269          LOCK(m_wallet->cs_wallet);
270          return m_wallet->IsLockedCoin(output);
271      }
272      void listLockedCoins(std::vector<COutPoint>& outputs) override
273      {
274          LOCK(m_wallet->cs_wallet);
275          return m_wallet->ListLockedCoins(outputs);
276      }
277      util::Result<CTransactionRef> createTransaction(const std::vector<CRecipient>& recipients,
278          const CCoinControl& coin_control,
279          bool sign,
280          int& change_pos,
281          CAmount& fee) override
282      {
283          LOCK(m_wallet->cs_wallet);
284          auto res = CreateTransaction(*m_wallet, recipients, change_pos == -1 ? std::nullopt : std::make_optional(change_pos),
285                                       coin_control, sign);
286          if (!res) return util::Error{util::ErrorString(res)};
287          const auto& txr = *res;
288          fee = txr.fee;
289          change_pos = txr.change_pos ? *txr.change_pos : -1;
290  
291          return txr.tx;
292      }
293      void commitTransaction(CTransactionRef tx,
294          WalletValueMap value_map,
295          WalletOrderForm order_form) override
296      {
297          LOCK(m_wallet->cs_wallet);
298          m_wallet->CommitTransaction(std::move(tx), std::move(value_map), std::move(order_form));
299      }
300      bool transactionCanBeAbandoned(const uint256& txid) override { return m_wallet->TransactionCanBeAbandoned(txid); }
301      bool abandonTransaction(const uint256& txid) override
302      {
303          LOCK(m_wallet->cs_wallet);
304          return m_wallet->AbandonTransaction(txid);
305      }
306      bool transactionCanBeBumped(const uint256& txid) override
307      {
308          return feebumper::TransactionCanBeBumped(*m_wallet.get(), txid);
309      }
310      bool createBumpTransaction(const uint256& txid,
311          const CCoinControl& coin_control,
312          std::vector<bilingual_str>& errors,
313          CAmount& old_fee,
314          CAmount& new_fee,
315          CMutableTransaction& mtx) override
316      {
317          std::vector<CTxOut> outputs; // just an empty list of new recipients for now
318          return feebumper::CreateRateBumpTransaction(*m_wallet.get(), txid, coin_control, errors, old_fee, new_fee, mtx, /* require_mine= */ true, outputs) == feebumper::Result::OK;
319      }
320      bool signBumpTransaction(CMutableTransaction& mtx) override { return feebumper::SignTransaction(*m_wallet.get(), mtx); }
321      bool commitBumpTransaction(const uint256& txid,
322          CMutableTransaction&& mtx,
323          std::vector<bilingual_str>& errors,
324          uint256& bumped_txid) override
325      {
326          return feebumper::CommitTransaction(*m_wallet.get(), txid, std::move(mtx), errors, bumped_txid) ==
327                 feebumper::Result::OK;
328      }
329      CTransactionRef getTx(const uint256& txid) override
330      {
331          LOCK(m_wallet->cs_wallet);
332          auto mi = m_wallet->mapWallet.find(txid);
333          if (mi != m_wallet->mapWallet.end()) {
334              return mi->second.tx;
335          }
336          return {};
337      }
338      WalletTx getWalletTx(const uint256& txid) override
339      {
340          LOCK(m_wallet->cs_wallet);
341          auto mi = m_wallet->mapWallet.find(txid);
342          if (mi != m_wallet->mapWallet.end()) {
343              return MakeWalletTx(*m_wallet, mi->second);
344          }
345          return {};
346      }
347      std::set<WalletTx> getWalletTxs() override
348      {
349          LOCK(m_wallet->cs_wallet);
350          std::set<WalletTx> result;
351          for (const auto& entry : m_wallet->mapWallet) {
352              result.emplace(MakeWalletTx(*m_wallet, entry.second));
353          }
354          return result;
355      }
356      bool tryGetTxStatus(const uint256& txid,
357          interfaces::WalletTxStatus& tx_status,
358          int& num_blocks,
359          int64_t& block_time) override
360      {
361          TRY_LOCK(m_wallet->cs_wallet, locked_wallet);
362          if (!locked_wallet) {
363              return false;
364          }
365          auto mi = m_wallet->mapWallet.find(txid);
366          if (mi == m_wallet->mapWallet.end()) {
367              return false;
368          }
369          num_blocks = m_wallet->GetLastBlockHeight();
370          block_time = -1;
371          CHECK_NONFATAL(m_wallet->chain().findBlock(m_wallet->GetLastBlockHash(), FoundBlock().time(block_time)));
372          tx_status = MakeWalletTxStatus(*m_wallet, mi->second);
373          return true;
374      }
375      WalletTx getWalletTxDetails(const uint256& txid,
376          WalletTxStatus& tx_status,
377          WalletOrderForm& order_form,
378          bool& in_mempool,
379          int& num_blocks) override
380      {
381          LOCK(m_wallet->cs_wallet);
382          auto mi = m_wallet->mapWallet.find(txid);
383          if (mi != m_wallet->mapWallet.end()) {
384              num_blocks = m_wallet->GetLastBlockHeight();
385              in_mempool = mi->second.InMempool();
386              order_form = mi->second.vOrderForm;
387              tx_status = MakeWalletTxStatus(*m_wallet, mi->second);
388              return MakeWalletTx(*m_wallet, mi->second);
389          }
390          return {};
391      }
392      TransactionError fillPSBT(int sighash_type,
393          bool sign,
394          bool bip32derivs,
395          size_t* n_signed,
396          PartiallySignedTransaction& psbtx,
397          bool& complete) override
398      {
399          return m_wallet->FillPSBT(psbtx, complete, sighash_type, sign, bip32derivs, n_signed);
400      }
401      WalletBalances getBalances() override
402      {
403          const auto bal = GetBalance(*m_wallet);
404          WalletBalances result;
405          result.balance = bal.m_mine_trusted;
406          result.unconfirmed_balance = bal.m_mine_untrusted_pending;
407          result.immature_balance = bal.m_mine_immature;
408          result.have_watch_only = haveWatchOnly();
409          if (result.have_watch_only) {
410              result.watch_only_balance = bal.m_watchonly_trusted;
411              result.unconfirmed_watch_only_balance = bal.m_watchonly_untrusted_pending;
412              result.immature_watch_only_balance = bal.m_watchonly_immature;
413          }
414          return result;
415      }
416      bool tryGetBalances(WalletBalances& balances, uint256& block_hash) override
417      {
418          TRY_LOCK(m_wallet->cs_wallet, locked_wallet);
419          if (!locked_wallet) {
420              return false;
421          }
422          block_hash = m_wallet->GetLastBlockHash();
423          balances = getBalances();
424          return true;
425      }
426      CAmount getBalance() override { return GetBalance(*m_wallet).m_mine_trusted; }
427      CAmount getAvailableBalance(const CCoinControl& coin_control) override
428      {
429          LOCK(m_wallet->cs_wallet);
430          CAmount total_amount = 0;
431          // Fetch selected coins total amount
432          if (coin_control.HasSelected()) {
433              FastRandomContext rng{};
434              CoinSelectionParams params(rng);
435              // Note: for now, swallow any error.
436              if (auto res = FetchSelectedInputs(*m_wallet, coin_control, params)) {
437                  total_amount += res->total_amount;
438              }
439          }
440  
441          // And fetch the wallet available coins
442          if (coin_control.m_allow_other_inputs) {
443              total_amount += AvailableCoins(*m_wallet, &coin_control).GetTotalAmount();
444          }
445  
446          return total_amount;
447      }
448      isminetype txinIsMine(const CTxIn& txin) override
449      {
450          LOCK(m_wallet->cs_wallet);
451          return InputIsMine(*m_wallet, txin);
452      }
453      isminetype txoutIsMine(const CTxOut& txout) override
454      {
455          LOCK(m_wallet->cs_wallet);
456          return m_wallet->IsMine(txout);
457      }
458      CAmount getDebit(const CTxIn& txin, isminefilter filter) override
459      {
460          LOCK(m_wallet->cs_wallet);
461          return m_wallet->GetDebit(txin, filter);
462      }
463      CAmount getCredit(const CTxOut& txout, isminefilter filter) override
464      {
465          LOCK(m_wallet->cs_wallet);
466          return OutputGetCredit(*m_wallet, txout, filter);
467      }
468      CoinsList listCoins() override
469      {
470          LOCK(m_wallet->cs_wallet);
471          CoinsList result;
472          for (const auto& entry : ListCoins(*m_wallet)) {
473              auto& group = result[entry.first];
474              for (const auto& coin : entry.second) {
475                  group.emplace_back(coin.outpoint,
476                      MakeWalletTxOut(*m_wallet, coin));
477              }
478          }
479          return result;
480      }
481      std::vector<WalletTxOut> getCoins(const std::vector<COutPoint>& outputs) override
482      {
483          LOCK(m_wallet->cs_wallet);
484          std::vector<WalletTxOut> result;
485          result.reserve(outputs.size());
486          for (const auto& output : outputs) {
487              result.emplace_back();
488              auto it = m_wallet->mapWallet.find(output.hash);
489              if (it != m_wallet->mapWallet.end()) {
490                  int depth = m_wallet->GetTxDepthInMainChain(it->second);
491                  if (depth >= 0) {
492                      result.back() = MakeWalletTxOut(*m_wallet, it->second, output.n, depth);
493                  }
494              }
495          }
496          return result;
497      }
498      CAmount getRequiredFee(unsigned int tx_bytes) override { return GetRequiredFee(*m_wallet, tx_bytes); }
499      CAmount getMinimumFee(unsigned int tx_bytes,
500          const CCoinControl& coin_control,
501          int* returned_target,
502          FeeReason* reason) override
503      {
504          FeeCalculation fee_calc;
505          CAmount result;
506          result = GetMinimumFee(*m_wallet, tx_bytes, coin_control, &fee_calc);
507          if (returned_target) *returned_target = fee_calc.returnedTarget;
508          if (reason) *reason = fee_calc.reason;
509          return result;
510      }
511      unsigned int getConfirmTarget() override { return m_wallet->m_confirm_target; }
512      bool hdEnabled() override { return m_wallet->IsHDEnabled(); }
513      bool canGetAddresses() override { return m_wallet->CanGetAddresses(); }
514      bool hasExternalSigner() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER); }
515      bool privateKeysDisabled() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS); }
516      bool taprootEnabled() override {
517          if (m_wallet->IsLegacy()) return false;
518          auto spk_man = m_wallet->GetScriptPubKeyMan(OutputType::BECH32M, /*internal=*/false);
519          return spk_man != nullptr;
520      }
521      OutputType getDefaultAddressType() override { return m_wallet->m_default_address_type; }
522      CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }
523      void remove() override
524      {
525          RemoveWallet(m_context, m_wallet, /*load_on_start=*/false);
526      }
527      bool isLegacy() override { return m_wallet->IsLegacy(); }
528      std::unique_ptr<Handler> handleUnload(UnloadFn fn) override
529      {
530          return MakeSignalHandler(m_wallet->NotifyUnload.connect(fn));
531      }
532      std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) override
533      {
534          return MakeSignalHandler(m_wallet->ShowProgress.connect(fn));
535      }
536      std::unique_ptr<Handler> handleStatusChanged(StatusChangedFn fn) override
537      {
538          return MakeSignalHandler(m_wallet->NotifyStatusChanged.connect([fn](CWallet*) { fn(); }));
539      }
540      std::unique_ptr<Handler> handleAddressBookChanged(AddressBookChangedFn fn) override
541      {
542          return MakeSignalHandler(m_wallet->NotifyAddressBookChanged.connect(
543              [fn](const CTxDestination& address, const std::string& label, bool is_mine,
544                   AddressPurpose purpose, ChangeType status) { fn(address, label, is_mine, purpose, status); }));
545      }
546      std::unique_ptr<Handler> handleTransactionChanged(TransactionChangedFn fn) override
547      {
548          return MakeSignalHandler(m_wallet->NotifyTransactionChanged.connect(
549              [fn](const uint256& txid, ChangeType status) { fn(txid, status); }));
550      }
551      std::unique_ptr<Handler> handleWatchOnlyChanged(WatchOnlyChangedFn fn) override
552      {
553          return MakeSignalHandler(m_wallet->NotifyWatchonlyChanged.connect(fn));
554      }
555      std::unique_ptr<Handler> handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) override
556      {
557          return MakeSignalHandler(m_wallet->NotifyCanGetAddressesChanged.connect(fn));
558      }
559      CWallet* wallet() override { return m_wallet.get(); }
560  
561      WalletContext& m_context;
562      std::shared_ptr<CWallet> m_wallet;
563  };
564  
565  class WalletLoaderImpl : public WalletLoader
566  {
567  public:
568      WalletLoaderImpl(Chain& chain, ArgsManager& args)
569      {
570          m_context.chain = &chain;
571          m_context.args = &args;
572      }
573      ~WalletLoaderImpl() override { UnloadWallets(m_context); }
574  
575      //! ChainClient methods
576      void registerRpcs() override
577      {
578          for (const CRPCCommand& command : GetWalletRPCCommands()) {
579              m_rpc_commands.emplace_back(command.category, command.name, [this, &command](const JSONRPCRequest& request, UniValue& result, bool last_handler) {
580                  JSONRPCRequest wallet_request = request;
581                  wallet_request.context = &m_context;
582                  return command.actor(wallet_request, result, last_handler);
583              }, command.argNames, command.unique_id);
584              m_rpc_handlers.emplace_back(m_context.chain->handleRpc(m_rpc_commands.back()));
585          }
586      }
587      bool verify() override { return VerifyWallets(m_context); }
588      bool load() override { return LoadWallets(m_context); }
589      void start(CScheduler& scheduler) override
590      {
591          m_context.scheduler = &scheduler;
592          return StartWallets(m_context);
593      }
594      void flush() override { return FlushWallets(m_context); }
595      void stop() override { return StopWallets(m_context); }
596      void setMockTime(int64_t time) override { return SetMockTime(time); }
597      void schedulerMockForward(std::chrono::seconds delta) override { Assert(m_context.scheduler)->MockForward(delta); }
598  
599      //! WalletLoader methods
600      util::Result<std::unique_ptr<Wallet>> createWallet(const std::string& name, const SecureString& passphrase, uint64_t wallet_creation_flags, std::vector<bilingual_str>& warnings) override
601      {
602          DatabaseOptions options;
603          DatabaseStatus status;
604          ReadDatabaseArgs(*m_context.args, options);
605          options.require_create = true;
606          options.create_flags = wallet_creation_flags;
607          options.create_passphrase = passphrase;
608          bilingual_str error;
609          std::unique_ptr<Wallet> wallet{MakeWallet(m_context, CreateWallet(m_context, name, /*load_on_start=*/true, options, status, error, warnings))};
610          if (wallet) {
611              return wallet;
612          } else {
613              return util::Error{error};
614          }
615      }
616      util::Result<std::unique_ptr<Wallet>> loadWallet(const std::string& name, std::vector<bilingual_str>& warnings) override
617      {
618          DatabaseOptions options;
619          DatabaseStatus status;
620          ReadDatabaseArgs(*m_context.args, options);
621          options.require_existing = true;
622          bilingual_str error;
623          std::unique_ptr<Wallet> wallet{MakeWallet(m_context, LoadWallet(m_context, name, /*load_on_start=*/true, options, status, error, warnings))};
624          if (wallet) {
625              return wallet;
626          } else {
627              return util::Error{error};
628          }
629      }
630      util::Result<std::unique_ptr<Wallet>> restoreWallet(const fs::path& backup_file, const std::string& wallet_name, std::vector<bilingual_str>& warnings) override
631      {
632          DatabaseStatus status;
633          bilingual_str error;
634          std::unique_ptr<Wallet> wallet{MakeWallet(m_context, RestoreWallet(m_context, backup_file, wallet_name, /*load_on_start=*/true, status, error, warnings))};
635          if (wallet) {
636              return wallet;
637          } else {
638              return util::Error{error};
639          }
640      }
641      util::Result<WalletMigrationResult> migrateWallet(const std::string& name, const SecureString& passphrase) override
642      {
643          auto res = wallet::MigrateLegacyToDescriptor(name, passphrase, m_context);
644          if (!res) return util::Error{util::ErrorString(res)};
645          WalletMigrationResult out{
646              .wallet = MakeWallet(m_context, res->wallet),
647              .watchonly_wallet_name = res->watchonly_wallet ? std::make_optional(res->watchonly_wallet->GetName()) : std::nullopt,
648              .solvables_wallet_name = res->solvables_wallet ? std::make_optional(res->solvables_wallet->GetName()) : std::nullopt,
649              .backup_path = res->backup_path,
650          };
651          return out;
652      }
653      std::string getWalletDir() override
654      {
655          return fs::PathToString(GetWalletDir());
656      }
657      std::vector<std::string> listWalletDir() override
658      {
659          std::vector<std::string> paths;
660          for (auto& path : ListDatabases(GetWalletDir())) {
661              paths.push_back(fs::PathToString(path));
662          }
663          return paths;
664      }
665      std::vector<std::unique_ptr<Wallet>> getWallets() override
666      {
667          std::vector<std::unique_ptr<Wallet>> wallets;
668          for (const auto& wallet : GetWallets(m_context)) {
669              wallets.emplace_back(MakeWallet(m_context, wallet));
670          }
671          return wallets;
672      }
673      std::unique_ptr<Handler> handleLoadWallet(LoadWalletFn fn) override
674      {
675          return HandleLoadWallet(m_context, std::move(fn));
676      }
677      WalletContext* context() override  { return &m_context; }
678  
679      WalletContext m_context;
680      const std::vector<std::string> m_wallet_filenames;
681      std::vector<std::unique_ptr<Handler>> m_rpc_handlers;
682      std::list<CRPCCommand> m_rpc_commands;
683  };
684  } // namespace
685  } // namespace wallet
686  
687  namespace interfaces {
688  std::unique_ptr<Wallet> MakeWallet(wallet::WalletContext& context, const std::shared_ptr<wallet::CWallet>& wallet) { return wallet ? std::make_unique<wallet::WalletImpl>(context, wallet) : nullptr; }
689  
690  std::unique_ptr<WalletLoader> MakeWalletLoader(Chain& chain, ArgsManager& args)
691  {
692      return std::make_unique<wallet::WalletLoaderImpl>(chain, args);
693  }
694  } // namespace interfaces