text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2017 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 <wallet/init.h>
  
  #include <net.h>
  #include <util.h>
  #include <utilmoneystr.h>
  #include <validation.h>
  #include <wallet/rpcwallet.h>
  #include <wallet/wallet.h>
  #include <wallet/walletutil.h>
  #include <miner.h>
  
  std::string GetWalletHelpString(bool showDebug)
  {
      std::string strUsage = HelpMessageGroup(_("Wallet options:"));
      strUsage += HelpMessageOpt("-addresstype", strprintf("What type of addresses to use (\"legacy\", \"p2sh-segwit\", or \"bech32\", default: \"%s\")", FormatOutputType(OUTPUT_TYPE_DEFAULT)));
      strUsage += HelpMessageOpt("-changetype", "What type of change to use (\"legacy\", \"p2sh-segwit\", or \"bech32\"). Default is same as -addresstype, except when -addresstype=p2sh-segwit a native segwit output is used when sending to a native segwit address)");
      strUsage += HelpMessageOpt("-disablewallet", _("Do not load the wallet and disable wallet RPC calls"));
      strUsage += HelpMessageOpt("-keypool=<n>", strprintf(_("Set key pool size to <n> (default: %u)"), DEFAULT_KEYPOOL_SIZE));
      strUsage += HelpMessageOpt("-fallbackfee=<amt>", strprintf(_("A fee rate (in %s/kB) that will be used when fee estimation has insufficient data (default: %s)"),
                                                                 CURRENCY_UNIT, FormatMoney(DEFAULT_FALLBACK_FEE)));
      strUsage += HelpMessageOpt("-discardfee=<amt>", strprintf(_("The fee rate (in %s/kB) that indicates your tolerance for discarding change by adding it to the fee (default: %s). "
                                                                  "Note: An output is discarded if it is dust at this rate, but we will always discard up to the dust relay fee and a discard fee above that is limited by the fee estimate for the longest target"),
                                                                CURRENCY_UNIT, FormatMoney(DEFAULT_DISCARD_FEE)));
      strUsage += HelpMessageOpt("-mintxfee=<amt>", strprintf(_("Fees (in %s/kB) smaller than this are considered zero fee for transaction creation (default: %s)"),
                                                              CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MINFEE)));
      strUsage += HelpMessageOpt("-paytxfee=<amt>", strprintf(_("Fee (in %s/kB) to add to transactions you send (default: %s)"),
                                                              CURRENCY_UNIT, FormatMoney(payTxFee.GetFeePerK())));
      strUsage += HelpMessageOpt("-rescan", _("Rescan the block chain for missing wallet transactions on startup"));
      strUsage += HelpMessageOpt("-salvagewallet", _("Attempt to recover private keys from a corrupt wallet on startup"));
      strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), DEFAULT_SPEND_ZEROCONF_CHANGE));
      strUsage += HelpMessageOpt("-txconfirmtarget=<n>", strprintf(_("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"), DEFAULT_TX_CONFIRM_TARGET));
      strUsage += HelpMessageOpt("-walletrbf", strprintf(_("Send transactions with full-RBF opt-in enabled (RPC only, default: %u)"), DEFAULT_WALLET_RBF));
      strUsage += HelpMessageOpt("-upgradewallet", _("Upgrade wallet to latest format on startup"));
      strUsage += HelpMessageOpt("-wallet=<file>", _("Specify wallet file (within data directory)") + " " + strprintf(_("(default: %s)"), DEFAULT_WALLET_DAT));
      strUsage += HelpMessageOpt("-walletbroadcast", _("Make the wallet broadcast transactions") + " " + strprintf(_("(default: %u)"), DEFAULT_WALLETBROADCAST));
      strUsage += HelpMessageOpt("-walletdir=<dir>", _("Specify directory to hold wallets (default: <datadir>/wallets if it exists, otherwise <datadir>)"));
      strUsage += HelpMessageOpt("-walletnotify=<cmd>", _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)"));
      strUsage += HelpMessageOpt("-zapwallettxes=<mode>", _("Delete all wallet transactions and only recover those parts of the blockchain through -rescan on startup") +
                                 " " + _("(1 = keep tx meta data e.g. account owner and payment request information, 2 = drop tx meta data)"));
  
      if (showDebug)
      {
          strUsage += HelpMessageGroup(_("Wallet debugging/testing options:"));
  
          strUsage += HelpMessageOpt("-dblogsize=<n>", strprintf("Flush wallet database activity from memory to disk log every <n> megabytes (default: %u)", DEFAULT_WALLET_DBLOGSIZE));
          strUsage += HelpMessageOpt("-flushwallet", strprintf("Run a thread to flush wallet periodically (default: %u)", DEFAULT_FLUSHWALLET));
          strUsage += HelpMessageOpt("-privdb", strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)", DEFAULT_WALLET_PRIVDB));
          strUsage += HelpMessageOpt("-walletrejectlongchains", strprintf(_("Wallet will not create transactions that violate mempool chain limits (default: %u)"), DEFAULT_WALLET_REJECT_LONG_CHAINS));
      }
  
      return strUsage;
  }
  
  bool WalletParameterInteraction()
  {
      if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
          for (const std::string& wallet : gArgs.GetArgs("-wallet")) {
              LogPrintf("%s: parameter interaction: -disablewallet -> ignoring -wallet=%s\n", __func__, wallet);
          }
  
          return true;
      }
  
      gArgs.SoftSetArg("-wallet", DEFAULT_WALLET_DAT);
      const bool is_multiwallet = gArgs.GetArgs("-wallet").size() > 1;
  
      if (gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY) && gArgs.SoftSetBoolArg("-walletbroadcast", false)) {
          LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting -walletbroadcast=0\n", __func__);
      }
  
      if (gArgs.GetBoolArg("-salvagewallet", false)) {
          if (is_multiwallet) {
              return InitError(strprintf("%s is only allowed with a single wallet file", "-salvagewallet"));
          }
          // Rewrite just private keys: rescan to find transactions
          if (gArgs.SoftSetBoolArg("-rescan", true)) {
              LogPrintf("%s: parameter interaction: -salvagewallet=1 -> setting -rescan=1\n", __func__);
          }
      }
  
      int zapwallettxes = gArgs.GetArg("-zapwallettxes", 0);
      // -zapwallettxes implies dropping the mempool on startup
      if (zapwallettxes != 0 && gArgs.SoftSetBoolArg("-persistmempool", false)) {
          LogPrintf("%s: parameter interaction: -zapwallettxes=%s -> setting -persistmempool=0\n", __func__, zapwallettxes);
      }
  
      // -zapwallettxes implies a rescan
      if (zapwallettxes != 0) {
          if (is_multiwallet) {
              return InitError(strprintf("%s is only allowed with a single wallet file", "-zapwallettxes"));
          }
          if (gArgs.SoftSetBoolArg("-rescan", true)) {
              LogPrintf("%s: parameter interaction: -zapwallettxes=%s -> setting -rescan=1\n", __func__, zapwallettxes);
          }
      }
  
      if (is_multiwallet) {
          if (gArgs.GetBoolArg("-upgradewallet", false)) {
              return InitError(strprintf("%s is only allowed with a single wallet file", "-upgradewallet"));
          }
      }
  
      if (gArgs.GetBoolArg("-sysperms", false))
          return InitError("-sysperms is not allowed in combination with enabled wallet functionality");
      if (gArgs.GetArg("-prune", 0) && gArgs.GetBoolArg("-rescan", false))
          return InitError(_("Rescans are not possible in pruned mode. You will need to use -reindex which will download the whole blockchain again."));
  
      if (::minRelayTxFee.GetFeePerK() > HIGH_TX_FEE_PER_KB)
          InitWarning(AmountHighWarn("-minrelaytxfee") + " " +
                      _("The wallet will avoid paying less than the minimum relay fee."));
  
      if (gArgs.IsArgSet("-mintxfee"))
      {
          CAmount n = 0;
          if (!ParseMoney(gArgs.GetArg("-mintxfee", ""), n) || 0 == n)
              return InitError(AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", "")));
          if (n > HIGH_TX_FEE_PER_KB)
              InitWarning(AmountHighWarn("-mintxfee") + " " +
                          _("This is the minimum transaction fee you pay on every transaction."));
          CWallet::minTxFee = CFeeRate(n);
      }
      if (gArgs.IsArgSet("-fallbackfee"))
      {
          CAmount nFeePerK = 0;
          if (!ParseMoney(gArgs.GetArg("-fallbackfee", ""), nFeePerK))
              return InitError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'"), gArgs.GetArg("-fallbackfee", "")));
          if (nFeePerK > HIGH_TX_FEE_PER_KB)
              InitWarning(AmountHighWarn("-fallbackfee") + " " +
                          _("This is the transaction fee you may pay when fee estimates are not available."));
          CWallet::fallbackFee = CFeeRate(nFeePerK);
      }
      if (gArgs.IsArgSet("-discardfee"))
      {
          CAmount nFeePerK = 0;
          if (!ParseMoney(gArgs.GetArg("-discardfee", ""), nFeePerK))
              return InitError(strprintf(_("Invalid amount for -discardfee=<amount>: '%s'"), gArgs.GetArg("-discardfee", "")));
          if (nFeePerK > HIGH_TX_FEE_PER_KB)
              InitWarning(AmountHighWarn("-discardfee") + " " +
                          _("This is the transaction fee you may discard if change is smaller than dust at this level"));
          CWallet::m_discard_rate = CFeeRate(nFeePerK);
      }
      if (gArgs.IsArgSet("-paytxfee"))
      {
          CAmount nFeePerK = 0;
          if (!ParseMoney(gArgs.GetArg("-paytxfee", ""), nFeePerK))
              return InitError(AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", "")));
          if (nFeePerK > HIGH_TX_FEE_PER_KB)
              InitWarning(AmountHighWarn("-paytxfee") + " " +
                          _("This is the transaction fee you will pay if you send a transaction."));
  
          payTxFee = CFeeRate(nFeePerK, 1000);
          if (payTxFee < ::minRelayTxFee)
          {
              return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
                                         gArgs.GetArg("-paytxfee", ""), ::minRelayTxFee.ToString()));
          }
      }
      if (gArgs.IsArgSet("-maxtxfee"))
      {
          CAmount nMaxFee = 0;
          if (!ParseMoney(gArgs.GetArg("-maxtxfee", ""), nMaxFee))
              return InitError(AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", "")));
          if (nMaxFee > HIGH_MAX_TX_FEE)
              InitWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction."));
          maxTxFee = nMaxFee;
          if (CFeeRate(maxTxFee, 1000) < ::minRelayTxFee)
          {
              return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
                                         gArgs.GetArg("-maxtxfee", ""), ::minRelayTxFee.ToString()));
          }
      }
      if (gArgs.IsArgSet("-reservebalance"))
      {
          CAmount nReserveBalance = 0;
          if (!ParseMoney(gArgs.GetArg("-reservebalance", ""), nReserveBalance))
              return InitError(strprintf(_("Invalid amount for -reservebalance=<amount>: '%s'"),
                                         gArgs.GetArg("-reservebalance", "")));
      }
      nTxConfirmTarget = gArgs.GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
      bSpendZeroConfChange = gArgs.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
      fWalletRbf = gArgs.GetBoolArg("-walletrbf", DEFAULT_WALLET_RBF);
  
      g_address_type = ParseOutputType(gArgs.GetArg("-addresstype", ""));
      if (g_address_type == OUTPUT_TYPE_NONE) {
          return InitError(strprintf("Unknown address type '%s'", gArgs.GetArg("-addresstype", "")));
      }
  
      // If changetype is set in config file or parameter, check that it's valid.
      // Default to OUTPUT_TYPE_NONE if not set.
      g_change_type = ParseOutputType(gArgs.GetArg("-changetype", ""), OUTPUT_TYPE_NONE);
      if (g_change_type == OUTPUT_TYPE_NONE && !gArgs.GetArg("-changetype", "").empty()) {
          return InitError(strprintf("Unknown change type '%s'", gArgs.GetArg("-changetype", "")));
      }
  
      return true;
  }
  
  void RegisterWalletRPC(CRPCTable &t)
  {
      if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
          return;
      }
  
      RegisterWalletRPCCommands(t);
  }
  
  bool VerifyWallets()
  {
      if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
          return true;
      }
  
      if (gArgs.IsArgSet("-walletdir")) {
          fs::path wallet_dir = gArgs.GetArg("-walletdir", "");
          if (!fs::exists(wallet_dir)) {
              return InitError(strprintf(_("Specified -walletdir \"%s\" does not exist"), wallet_dir.string()));
          } else if (!fs::is_directory(wallet_dir)) {
              return InitError(strprintf(_("Specified -walletdir \"%s\" is not a directory"), wallet_dir.string()));
          } else if (!wallet_dir.is_absolute()) {
              return InitError(strprintf(_("Specified -walletdir \"%s\" is a relative path"), wallet_dir.string()));
          }
      }
  
      LogPrintf("Using wallet directory %s\n", GetWalletDir().string());
  
      uiInterface.InitMessage(_("Verifying wallet(s)..."));
  
      // Keep track of each wallet absolute path to detect duplicates.
      std::set<fs::path> wallet_paths;
  
      for (const std::string& walletFile : gArgs.GetArgs("-wallet")) {
          if (boost::filesystem::path(walletFile).filename() != walletFile) {
              return InitError(strprintf(_("Error loading wallet %s. -wallet parameter must only specify a filename (not a path)."), walletFile));
          }
  
          if (SanitizeString(walletFile, SAFE_CHARS_FILENAME) != walletFile) {
              return InitError(strprintf(_("Error loading wallet %s. Invalid characters in -wallet filename."), walletFile));
          }
  
          fs::path wallet_path = fs::absolute(walletFile, GetWalletDir());
  
          if (fs::exists(wallet_path) && (!fs::is_regular_file(wallet_path) || fs::is_symlink(wallet_path))) {
              return InitError(strprintf(_("Error loading wallet %s. -wallet filename must be a regular file."), walletFile));
          }
  
          if (!wallet_paths.insert(wallet_path).second) {
              return InitError(strprintf(_("Error loading wallet %s. Duplicate -wallet filename specified."), walletFile));
          }
  
          std::string strError;
          if (!CWalletDB::VerifyEnvironment(walletFile, GetWalletDir().string(), strError)) {
              return InitError(strError);
          }
  
          if (gArgs.GetBoolArg("-salvagewallet", false)) {
              // Recover readable keypairs:
              CWallet dummyWallet;
              std::string backup_filename;
              if (!CWalletDB::Recover(walletFile, (void *)&dummyWallet, CWalletDB::RecoverKeysOnlyFilter, backup_filename)) {
                  return false;
              }
          }
  
          std::string strWarning;
          bool dbV = CWalletDB::VerifyDatabaseFile(walletFile, GetWalletDir().string(), strWarning, strError);
          if (!strWarning.empty()) {
              InitWarning(strWarning);
          }
          if (!dbV) {
              InitError(strError);
              return false;
          }
      }
  
      return true;
  }
  
  bool OpenWallets()
  {
      if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
          LogPrintf("Wallet disabled!\n");
          return true;
      }
  
      for (const std::string& walletFile : gArgs.GetArgs("-wallet")) {
          CWallet * const pwallet = CWallet::CreateWalletFromFile(walletFile);
          if (!pwallet) {
              return false;
          }
          vpwallets.push_back(pwallet);
      }
  
      return true;
  }
  
  void StartWallets(CScheduler& scheduler) {
      for (CWalletRef pwallet : vpwallets) {
          pwallet->postInitProcess(scheduler);
      }
  }
  
  void FlushWallets() {
      for (CWalletRef pwallet : vpwallets) {
          pwallet->Flush(false);
      }
  }
  
  void StopWallets() {
      for (CWalletRef pwallet : vpwallets) {
          pwallet->Flush(true);
      }
  }
  
  void CloseWallets() {
      for (CWalletRef pwallet : vpwallets) {
          delete pwallet;
      }
      vpwallets.clear();
  }
  
  void StartMinting(boost::thread_group& threadGroup) {
      for (CWalletRef pwallet : vpwallets) {
          MintStake(threadGroup, pwallet);
      }
  }
  