text: // Copyright (c) 2018-2020 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <interfaces/wallet.h>
  
  #include <amount.h>
  #include <interfaces/chain.h>
  #include <interfaces/handler.h>
  #include <policy/fees.h>
  #include <primitives/transaction.h>
  #include <rpc/server.h>
  #include <script/standard.h>
  #include <support/allocators/secure.h>
  #include <sync.h>
  #include <uint256.h>
  #include <util/check.h>
  #include <util/ref.h>
  #include <util/system.h>
  #include <util/ui_change_type.h>
  #include <wallet/context.h>
  #include <wallet/feebumper.h>
  #include <wallet/fees.h>
  #include <wallet/ismine.h>
  #include <wallet/load.h>
  #include <wallet/rpcwallet.h>
  #include <wallet/wallet.h>
  
  #include <memory>
  #include <string>
  #include <utility>
  #include <vector>
  
  namespace interfaces {
  namespace {
  
  //! Construct wallet tx struct.
  WalletTx MakeWalletTx(CWallet& wallet, const CWalletTx& wtx)
  {
      LOCK(wallet.cs_wallet);
      WalletTx result;
      result.tx = wtx.tx;
      result.txin_is_mine.reserve(wtx.tx->vin.size());
      for (const auto& txin : wtx.tx->vin) {
          result.txin_is_mine.emplace_back(wallet.IsMine(txin));
      }
      result.txout_is_mine.reserve(wtx.tx->vout.size());
      result.txout_address.reserve(wtx.tx->vout.size());
      result.txout_address_is_mine.reserve(wtx.tx->vout.size());
      for (const auto& txout : wtx.tx->vout) {
          result.txout_is_mine.emplace_back(wallet.IsMine(txout));
          result.txout_address.emplace_back();
          result.txout_address_is_mine.emplace_back(ExtractDestination(txout.scriptPubKey, result.txout_address.back()) ?
                                                        wallet.IsMine(result.txout_address.back()) :
                                                        ISMINE_NO);
      }
      result.credit = wtx.GetCredit(ISMINE_ALL);
      result.debit = wtx.GetDebit(ISMINE_ALL);
      result.change = wtx.GetChange();
      result.time = wtx.GetTxTime();
      result.value_map = wtx.mapValue;
      result.is_coinbase = wtx.IsCoinBase();
      return result;
  }
  
  //! Construct wallet tx status struct.
  WalletTxStatus MakeWalletTxStatus(CWallet& wallet, const CWalletTx& wtx)
  {
      WalletTxStatus result;
      result.block_height = wtx.m_confirm.block_height > 0 ? wtx.m_confirm.block_height : std::numeric_limits<int>::max();
      result.blocks_to_maturity = wtx.GetBlocksToMaturity();
      result.depth_in_main_chain = wtx.GetDepthInMainChain();
      result.time_received = wtx.nTimeReceived;
      result.lock_time = wtx.tx->nLockTime;
      result.is_final = wallet.chain().checkFinalTx(*wtx.tx);
      result.is_trusted = wtx.IsTrusted();
      result.is_abandoned = wtx.isAbandoned();
      result.is_coinbase = wtx.IsCoinBase();
      result.is_in_main_chain = wtx.IsInMainChain();
      return result;
  }
  
  //! Construct wallet TxOut struct.
  WalletTxOut MakeWalletTxOut(CWallet& wallet,
      const CWalletTx& wtx,
      int n,
      int depth) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
  {
      WalletTxOut result;
      result.txout = wtx.tx->vout[n];
      result.time = wtx.GetTxTime();
      result.depth_in_main_chain = depth;
      result.is_spent = wallet.IsSpent(wtx.GetHash(), n);
      return result;
  }
  
  class WalletImpl : public Wallet
  {
  public:
      explicit WalletImpl(const std::shared_ptr<CWallet>& wallet) : m_wallet(wallet) {}
  
      bool encryptWallet(const SecureString& wallet_passphrase) override
      {
          return m_wallet->EncryptWallet(wallet_passphrase);
      }
      bool isCrypted() override { return m_wallet->IsCrypted(); }
      bool lock() override { return m_wallet->Lock(); }
      bool unlock(const SecureString& wallet_passphrase) override { return m_wallet->Unlock(wallet_passphrase); }
      bool isLocked() override { return m_wallet->IsLocked(); }
      bool changeWalletPassphrase(const SecureString& old_wallet_passphrase,
          const SecureString& new_wallet_passphrase) override
      {
          return m_wallet->ChangeWalletPassphrase(old_wallet_passphrase, new_wallet_passphrase);
      }
      void abortRescan() override { m_wallet->AbortRescan(); }
      bool backupWallet(const std::string& filename) override { return m_wallet->BackupWallet(filename); }
      std::string getWalletName() override { return m_wallet->GetName(); }
      bool getNewDestination(const OutputType type, const std::string label, CTxDestination& dest) override
      {
          LOCK(m_wallet->cs_wallet);
          std::string error;
          return m_wallet->GetNewDestination(type, label, dest, error);
      }
      bool getPubKey(const CScript& script, const CKeyID& address, CPubKey& pub_key) override
      {
          std::unique_ptr<SigningProvider> provider = m_wallet->GetSolvingProvider(script);
          if (provider) {
              return provider->GetPubKey(address, pub_key);
          }
          return false;
      }
      SigningResult signMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) override
      {
          return m_wallet->SignMessage(message, pkhash, str_sig);
      }
      bool isSpendable(const CTxDestination& dest) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->IsMine(dest) & ISMINE_SPENDABLE;
      }
      bool haveWatchOnly() override
      {
          auto spk_man = m_wallet->GetLegacyScriptPubKeyMan();
          if (spk_man) {
              return spk_man->HaveWatchOnly();
          }
          return false;
      };
      bool setAddressBook(const CTxDestination& dest, const std::string& name, const std::string& purpose) override
      {
          return m_wallet->SetAddressBook(dest, name, purpose);
      }
      bool delAddressBook(const CTxDestination& dest) override
      {
          return m_wallet->DelAddressBook(dest);
      }
      bool getAddress(const CTxDestination& dest,
          std::string* name,
          isminetype* is_mine,
          std::string* purpose) override
      {
          LOCK(m_wallet->cs_wallet);
          auto it = m_wallet->m_address_book.find(dest);
          if (it == m_wallet->m_address_book.end() || it->second.IsChange()) {
              return false;
          }
          if (name) {
              *name = it->second.GetLabel();
          }
          if (is_mine) {
              *is_mine = m_wallet->IsMine(dest);
          }
          if (purpose) {
              *purpose = it->second.purpose;
          }
          return true;
      }
      std::vector<WalletAddress> getAddresses() override
      {
          LOCK(m_wallet->cs_wallet);
          std::vector<WalletAddress> result;
          for (const auto& item : m_wallet->m_address_book) {
              if (item.second.IsChange()) continue;
              result.emplace_back(item.first, m_wallet->IsMine(item.first), item.second.GetLabel(), item.second.purpose);
          }
          return result;
      }
      bool addDestData(const CTxDestination& dest, const std::string& key, const std::string& value) override
      {
          LOCK(m_wallet->cs_wallet);
          WalletBatch batch{m_wallet->GetDatabase()};
          return m_wallet->AddDestData(batch, dest, key, value);
      }
      bool eraseDestData(const CTxDestination& dest, const std::string& key) override
      {
          LOCK(m_wallet->cs_wallet);
          WalletBatch batch{m_wallet->GetDatabase()};
          return m_wallet->EraseDestData(batch, dest, key);
      }
      std::vector<std::string> getDestValues(const std::string& prefix) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->GetDestValues(prefix);
      }
      void lockCoin(const COutPoint& output) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->LockCoin(output);
      }
      void unlockCoin(const COutPoint& output) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->UnlockCoin(output);
      }
      bool isLockedCoin(const COutPoint& output) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->IsLockedCoin(output.hash, output.n);
      }
      void listLockedCoins(std::vector<COutPoint>& outputs) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->ListLockedCoins(outputs);
      }
      CTransactionRef createTransaction(const std::vector<CRecipient>& recipients,
          const CCoinControl& coin_control,
          bool sign,
          int& change_pos,
          CAmount& fee,
          bilingual_str& fail_reason) override
      {
          LOCK(m_wallet->cs_wallet);
          CTransactionRef tx;
          if (!m_wallet->CreateTransaction(recipients, tx, fee, change_pos,
                  fail_reason, coin_control, sign)) {
              return {};
          }
          return tx;
      }
      void commitTransaction(CTransactionRef tx,
          WalletValueMap value_map,
          WalletOrderForm order_form) override
      {
          LOCK(m_wallet->cs_wallet);
          m_wallet->CommitTransaction(std::move(tx), std::move(value_map), std::move(order_form));
      }
      bool transactionCanBeAbandoned(const uint256& txid) override { return m_wallet->TransactionCanBeAbandoned(txid); }
      bool abandonTransaction(const uint256& txid) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->AbandonTransaction(txid);
      }
      bool transactionCanBeBumped(const uint256& txid) override
      {
          return feebumper::TransactionCanBeBumped(*m_wallet.get(), txid);
      }
      bool createBumpTransaction(const uint256& txid,
          const CCoinControl& coin_control,
          std::vector<bilingual_str>& errors,
          CAmount& old_fee,
          CAmount& new_fee,
          CMutableTransaction& mtx) override
      {
          return feebumper::CreateRateBumpTransaction(*m_wallet.get(), txid, coin_control, errors, old_fee, new_fee, mtx) == feebumper::Result::OK;
      }
      bool signBumpTransaction(CMutableTransaction& mtx) override { return feebumper::SignTransaction(*m_wallet.get(), mtx); }
      bool commitBumpTransaction(const uint256& txid,
          CMutableTransaction&& mtx,
          std::vector<bilingual_str>& errors,
          uint256& bumped_txid) override
      {
          return feebumper::CommitTransaction(*m_wallet.get(), txid, std::move(mtx), errors, bumped_txid) ==
                 feebumper::Result::OK;
      }
      CTransactionRef getTx(const uint256& txid) override
      {
          LOCK(m_wallet->cs_wallet);
          auto mi = m_wallet->mapWallet.find(txid);
          if (mi != m_wallet->mapWallet.end()) {
              return mi->second.tx;
          }
          return {};
      }
      WalletTx getWalletTx(const uint256& txid) override
      {
          LOCK(m_wallet->cs_wallet);
          auto mi = m_wallet->mapWallet.find(txid);
          if (mi != m_wallet->mapWallet.end()) {
              return MakeWalletTx(*m_wallet, mi->second);
          }
          return {};
      }
      std::vector<WalletTx> getWalletTxs() override
      {
          LOCK(m_wallet->cs_wallet);
          std::vector<WalletTx> result;
          result.reserve(m_wallet->mapWallet.size());
          for (const auto& entry : m_wallet->mapWallet) {
              result.emplace_back(MakeWalletTx(*m_wallet, entry.second));
          }
          return result;
      }
      bool tryGetTxStatus(const uint256& txid,
          interfaces::WalletTxStatus& tx_status,
          int& num_blocks,
          int64_t& block_time) override
      {
          TRY_LOCK(m_wallet->cs_wallet, locked_wallet);
          if (!locked_wallet) {
              return false;
          }
          auto mi = m_wallet->mapWallet.find(txid);
          if (mi == m_wallet->mapWallet.end()) {
              return false;
          }
          num_blocks = m_wallet->GetLastBlockHeight();
          block_time = -1;
          CHECK_NONFATAL(m_wallet->chain().findBlock(m_wallet->GetLastBlockHash(), FoundBlock().time(block_time)));
          tx_status = MakeWalletTxStatus(*m_wallet, mi->second);
          return true;
      }
      WalletTx getWalletTxDetails(const uint256& txid,
          WalletTxStatus& tx_status,
          WalletOrderForm& order_form,
          bool& in_mempool,
          int& num_blocks) override
      {
          LOCK(m_wallet->cs_wallet);
          auto mi = m_wallet->mapWallet.find(txid);
          if (mi != m_wallet->mapWallet.end()) {
              num_blocks = m_wallet->GetLastBlockHeight();
              in_mempool = mi->second.InMempool();
              order_form = mi->second.vOrderForm;
              tx_status = MakeWalletTxStatus(*m_wallet, mi->second);
              return MakeWalletTx(*m_wallet, mi->second);
          }
          return {};
      }
      TransactionError fillPSBT(int sighash_type,
          bool sign,
          bool bip32derivs,
          PartiallySignedTransaction& psbtx,
          bool& complete,
          size_t* n_signed) override
      {
          return m_wallet->FillPSBT(psbtx, complete, sighash_type, sign, bip32derivs, n_signed);
      }
      WalletBalances getBalances() override
      {
          const auto bal = m_wallet->GetBalance();
          WalletBalances result;
          result.balance = bal.m_mine_trusted;
          result.unconfirmed_balance = bal.m_mine_untrusted_pending;
          result.immature_balance = bal.m_mine_immature;
          result.have_watch_only = haveWatchOnly();
          if (result.have_watch_only) {
              result.watch_only_balance = bal.m_watchonly_trusted;
              result.unconfirmed_watch_only_balance = bal.m_watchonly_untrusted_pending;
              result.immature_watch_only_balance = bal.m_watchonly_immature;
          }
          return result;
      }
      bool tryGetBalances(WalletBalances& balances, uint256& block_hash) override
      {
          TRY_LOCK(m_wallet->cs_wallet, locked_wallet);
          if (!locked_wallet) {
              return false;
          }
          block_hash = m_wallet->GetLastBlockHash();
          balances = getBalances();
          return true;
      }
      CAmount getBalance() override { return m_wallet->GetBalance().m_mine_trusted; }
      CAmount getAvailableBalance(const CCoinControl& coin_control) override
      {
          return m_wallet->GetAvailableBalance(&coin_control);
      }
      isminetype txinIsMine(const CTxIn& txin) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->IsMine(txin);
      }
      isminetype txoutIsMine(const CTxOut& txout) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->IsMine(txout);
      }
      CAmount getDebit(const CTxIn& txin, isminefilter filter) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->GetDebit(txin, filter);
      }
      CAmount getCredit(const CTxOut& txout, isminefilter filter) override
      {
          LOCK(m_wallet->cs_wallet);
          return m_wallet->GetCredit(txout, filter);
      }
      CoinsList listCoins() override
      {
          LOCK(m_wallet->cs_wallet);
          CoinsList result;
          for (const auto& entry : m_wallet->ListCoins()) {
              auto& group = result[entry.first];
              for (const auto& coin : entry.second) {
                  group.emplace_back(COutPoint(coin.tx->GetHash(), coin.i),
                      MakeWalletTxOut(*m_wallet, *coin.tx, coin.i, coin.nDepth));
              }
          }
          return result;
      }
      std::vector<WalletTxOut> getCoins(const std::vector<COutPoint>& outputs) override
      {
          LOCK(m_wallet->cs_wallet);
          std::vector<WalletTxOut> result;
          result.reserve(outputs.size());
          for (const auto& output : outputs) {
              result.emplace_back();
              auto it = m_wallet->mapWallet.find(output.hash);
              if (it != m_wallet->mapWallet.end()) {
                  int depth = it->second.GetDepthInMainChain();
                  if (depth >= 0) {
                      result.back() = MakeWalletTxOut(*m_wallet, it->second, output.n, depth);
                  }
              }
          }
          return result;
      }
      CAmount getRequiredFee(unsigned int tx_bytes) override { return GetRequiredFee(*m_wallet, tx_bytes); }
      CAmount getMinimumFee(unsigned int tx_bytes,
          const CCoinControl& coin_control,
          int* returned_target,
          FeeReason* reason) override
      {
          FeeCalculation fee_calc;
          CAmount result;
          result = GetMinimumFee(*m_wallet, tx_bytes, coin_control, &fee_calc);
          if (returned_target) *returned_target = fee_calc.returnedTarget;
          if (reason) *reason = fee_calc.reason;
          return result;
      }
      unsigned int getConfirmTarget() override { return m_wallet->m_confirm_target; }
      bool hdEnabled() override { return m_wallet->IsHDEnabled(); }
      bool canGetAddresses() override { return m_wallet->CanGetAddresses(); }
      bool privateKeysDisabled() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS); }
      OutputType getDefaultAddressType() override { return m_wallet->m_default_address_type; }
      CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }
      void remove() override
      {
          RemoveWallet(m_wallet);
      }
      bool isLegacy() override { return m_wallet->IsLegacy(); }
      std::unique_ptr<Handler> handleUnload(UnloadFn fn) override
      {
          return MakeHandler(m_wallet->NotifyUnload.connect(fn));
      }
      std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) override
      {
          return MakeHandler(m_wallet->ShowProgress.connect(fn));
      }
      std::unique_ptr<Handler> handleStatusChanged(StatusChangedFn fn) override
      {
          return MakeHandler(m_wallet->NotifyStatusChanged.connect([fn](CWallet*) { fn(); }));
      }
      std::unique_ptr<Handler> handleAddressBookChanged(AddressBookChangedFn fn) override
      {
          return MakeHandler(m_wallet->NotifyAddressBookChanged.connect(
              [fn](CWallet*, const CTxDestination& address, const std::string& label, bool is_mine,
                  const std::string& purpose, ChangeType status) { fn(address, label, is_mine, purpose, status); }));
      }
      std::unique_ptr<Handler> handleTransactionChanged(TransactionChangedFn fn) override
      {
          return MakeHandler(m_wallet->NotifyTransactionChanged.connect(
              [fn](CWallet*, const uint256& txid, ChangeType status) { fn(txid, status); }));
      }
      std::unique_ptr<Handler> handleWatchOnlyChanged(WatchOnlyChangedFn fn) override
      {
          return MakeHandler(m_wallet->NotifyWatchonlyChanged.connect(fn));
      }
      std::unique_ptr<Handler> handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) override
      {
          return MakeHandler(m_wallet->NotifyCanGetAddressesChanged.connect(fn));
      }
      CWallet* wallet() override { return m_wallet.get(); }
  
      std::shared_ptr<CWallet> m_wallet;
  };
  
  class WalletClientImpl : public ChainClient
  {
  public:
      WalletClientImpl(Chain& chain, ArgsManager& args, std::vector<std::string> wallet_filenames)
          : m_wallet_filenames(std::move(wallet_filenames))
      {
          m_context.chain = &chain;
          m_context.args = &args;
      }
      void registerRpcs() override
      {
          for (const CRPCCommand& command : GetWalletRPCCommands()) {
              m_rpc_commands.emplace_back(command.category, command.name, [this, &command](const JSONRPCRequest& request, UniValue& result, bool last_handler) {
                  return command.actor({request, m_context}, result, last_handler);
              }, command.argNames, command.unique_id);
              m_rpc_handlers.emplace_back(m_context.chain->handleRpc(m_rpc_commands.back()));
          }
      }
      bool verify() override { return VerifyWallets(*m_context.chain, m_wallet_filenames); }
      bool load() override { return LoadWallets(*m_context.chain, m_wallet_filenames); }
      void start(CScheduler& scheduler) override { return StartWallets(scheduler, *Assert(m_context.args)); }
      void flush() override { return FlushWallets(); }
      void stop() override { return StopWallets(); }
      void setMockTime(int64_t time) override { return SetMockTime(time); }
      std::vector<std::unique_ptr<Wallet>> getWallets() override
      {
          std::vector<std::unique_ptr<Wallet>> wallets;
          for (const auto& wallet : GetWallets()) {
              wallets.emplace_back(MakeWallet(wallet));
          }
          return wallets;
      }
      ~WalletClientImpl() override { UnloadWallets(); }
  
      WalletContext m_context;
      const std::vector<std::string> m_wallet_filenames;
      std::vector<std::unique_ptr<Handler>> m_rpc_handlers;
      std::list<CRPCCommand> m_rpc_commands;
  };
  
  } // namespace
  
  std::unique_ptr<Wallet> MakeWallet(const std::shared_ptr<CWallet>& wallet) { return wallet ? MakeUnique<WalletImpl>(wallet) : nullptr; }
  
  std::unique_ptr<ChainClient> MakeWalletClient(Chain& chain, ArgsManager& args, std::vector<std::string> wallet_filenames)
  {
      return MakeUnique<WalletClientImpl>(chain, args, std::move(wallet_filenames));
  }
  
  } // namespace interfaces
  