text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2012 The Bitcoin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "txdb.h"
  #include "walletdb.h"
  #include "rpcserver.h"
  #include "net.h"
  #include "init.h"
  #include "state.h"
  #include "sync.h"
  #include "util.h"
  #include "ui_interface.h"
  
  #include "smessage.h"
  #include "ringsig.h"
  #include "miner.h"
  
  #include <boost/filesystem.hpp>
  #include <boost/filesystem/fstream.hpp>
  #include <boost/filesystem/convenience.hpp>
  #include <boost/interprocess/sync/file_lock.hpp>
  #include <boost/algorithm/string/predicate.hpp>
  #include <openssl/crypto.h>
  
  #ifndef WIN32
  #include <signal.h>
  #endif
  
  namespace fs = boost::filesystem;
  
  CWallet* pwalletMain;
  CClientUIInterface uiInterface;
  
  static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // Shutdown
  //
  
  //
  // Thread management and startup/shutdown:
  //
  // The network-processing threads are all part of a thread group
  // created by AppInit() or the Qt main() function.
  //
  // A clean exit happens when StartShutdown() or the SIGTERM
  // signal handler sets fRequestShutdown, which triggers
  // the DetectShutdownThread(), which interrupts the main thread group.
  // DetectShutdownThread() then exits, which causes AppInit() to
  // continue (it .joins the shutdown thread).
  // Shutdown() is then
  // called to clean up database connections, and stop other
  // threads that should only be stopped after the main network-processing
  // threads have exited.
  //
  // Note that if running -daemon the parent process returns from AppInit2
  // before adding any threads to the threadGroup, so .join_all() returns
  // immediately and the parent exits from main().
  //
  // Shutdown for Qt is very similar, only it uses a QTimer to detect
  // fRequestShutdown getting set, and then does the normal Qt
  // shutdown thing.
  //
  
  volatile bool fRequestShutdown = false;
  //boost::atomic<bool> fRequestShutdown(false);
  
  void StartShutdown()
  {
      fRequestShutdown = true;
  }
  bool ShutdownRequested()
  {
      return fRequestShutdown;
  }
  
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // Shutdown
  //
  
  bool Finalise()
  {
      LogPrintf("Finalise()\n");
      
      StopRPCThreads();
      ShutdownRPCMining();
      SecureMsgShutdown();
      
      mempool.AddTransactionsUpdated(1);
      if (pwalletMain)
          bitdb.Flush(false);
      
      StopNode();
      
      if (pwalletMain)
      {
          {
              LOCK2(cs_main, pwalletMain->cs_wallet);
              pwalletMain->Finalise();
          }
          bitdb.Flush(true);
          UnregisterWallet(pwalletMain);
          delete pwalletMain;
          pwalletMain = NULL;
      };
      
      finaliseRingSigs();
      
      if (nNodeMode == NT_FULL)
      {
          std::map<uint256, CBlockIndex*>::iterator it;
  
          for (it = mapBlockIndex.begin(); it != mapBlockIndex.end(); ++it)
          {
              delete it->second;
          };
          mapBlockIndex.clear();
          if (fDebug)
              LogPrintf("mapBlockIndex cleared.\n");
      } else
      {
          std::map<uint256, CBlockThinIndex*>::iterator it;
  
          for (it = mapBlockThinIndex.begin(); it != mapBlockThinIndex.end(); ++it)
          {
              delete it->second;
          };
          mapBlockThinIndex.clear();
          if (fDebug)
              LogPrintf("mapBlockThinIndex cleared.\n");
      };
      
      CTxDB().Close();
      
      fs::remove(GetPidFile());
      return true;
  }
  
  void Shutdown()
  {
      static CCriticalSection cs_Shutdown;
      TRY_LOCK(cs_Shutdown, lockShutdown);
      if (!lockShutdown) return;
      
      Finalise();
      
      LogPrintf("Shutdown complete.\n\n");
  }
  
  void HandleSIGTERM(int)
  {
      fRequestShutdown = true;
  }
  
  void HandleSIGHUP(int)
  {
      fReopenDebugLog = true;
  }
  
  
  bool static InitError(const std::string &str)
  {
      uiInterface.ThreadSafeMessageBox(str, _("Neuron"), CClientUIInterface::BTN_OK | CClientUIInterface::MODAL);
      return false;
  }
  
  bool static InitWarning(const std::string &str)
  {
      uiInterface.ThreadSafeMessageBox(str, _("Neuron"), CClientUIInterface::BTN_OK | CClientUIInterface::ICON_WARNING | CClientUIInterface::MODAL);
      return true;
  }
  
  
  bool static Bind(const CService &addr, bool fError = true)
  {
      if (IsLimited(addr))
          return false;
  
      std::string strError;
      if (!BindListenPort(addr, strError))
      {
          if (fError)
              return InitError(strError);
          return false;
      };
  
      return true;
  }
  
  // Core-specific options shared between UI and daemon
  std::string HelpMessage()
  {
      std::string strUsage = _("Options:") + "\n";
      strUsage += "  -?                     " + _("This help message") + "\n";
      strUsage += "  -conf=<file>           " + _("Specify configuration file (default: neuron.conf)") + "\n";
      strUsage += "  -pid=<file>            " + _("Specify pid file (default: neurond.pid)") + "\n";
      strUsage += "  -datadir=<dir>         " + _("Specify data directory") + "\n";
      strUsage += "  -wallet=<dir>          " + _("Specify wallet file (within data directory)") + "\n";
      strUsage += "  -dbcache=<n>           " + _("Set database cache size in megabytes (default: 25)") + "\n";
      strUsage += "  -dblogsize=<n>         " + _("Set database disk log size in megabytes (default: 100)") + "\n";
      strUsage += "  -timeout=<n>           " + _("Specify connection timeout in milliseconds (default: 5000)") + "\n";
      strUsage += "  -proxy=<ip:port>       " + _("Connect through socks proxy") + "\n";
      strUsage += "  -socks=<n>             " + _("Select the version of socks proxy to use (4-5, default: 5)") + "\n";
      strUsage += "  -tor=<ip:port>         " + _("Use proxy to reach tor hidden services (default: same as -proxy)") + "\n";
      strUsage += "  -dns                   " + _("Allow DNS lookups for -addnode, -seednode and -connect") + "\n";
      strUsage += "  -port=<port>           " + _("Listen for connections on <port> (default: 33555 or testnet: 36555)") + "\n";
      strUsage += "  -maxconnections=<n>    " + _("Maintain at most <n> connections to peers (default: 125)") + "\n";
      strUsage += "  -addnode=<ip>          " + _("Add a node to connect to and attempt to keep the connection open") + "\n";
      strUsage += "  -connect=<ip>          " + _("Connect only to the specified node(s)") + "\n";
      strUsage += "  -seednode=<ip>         " + _("Connect to a node to retrieve peer addresses, and disconnect") + "\n";
      strUsage += "  -externalip=<ip>       " + _("Specify your own public address") + "\n";
      strUsage += "  -onlynet=<net>         " + _("Only connect to nodes in network <net> (IPv4, IPv6 or Tor)") + "\n";
      strUsage += "  -discover              " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n";
      strUsage += "  -listen                " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n";
      strUsage += "  -bind=<addr>           " + _("Bind to given address. Use [host]:port notation for IPv6") + "\n";
      strUsage += "  -dnsseed               " + _("Find peers using DNS lookup (default: 1)") + "\n";
      strUsage += "  -staking               " + _("Stake your coins to support network and gain reward (default: 1)") + "\n";
      strUsage += "  -minstakeinterval=<n>  " + _("Minimum time in seconds between successful stakes (default: 30)") + "\n";
      strUsage += "  -minersleep=<n>        " + _("Milliseconds between stake attempts. Lowering this param will not result in more stakes. (default: 500)") + "\n";
      strUsage += "  -synctime              " + _("Sync time with other nodes. Disable if time on your system is precise e.g. syncing with NTP (default: 1)") + "\n";
      strUsage += "  -banscore=<n>          " + _("Threshold for disconnecting misbehaving peers (default: 100)") + "\n";
      strUsage += "  -bantime=<n>           " + _("Number of seconds to keep misbehaving peers from reconnecting (default: 86400)") + "\n";
      strUsage += "  -softbantime=<n>       " + _("Number of seconds to keep soft banned peers from reconnecting (default: 3600)") + "\n";
      strUsage += "  -maxreceivebuffer=<n>  " + _("Maximum per-connection receive buffer, <n>*1000 bytes (default: 5000)") + "\n";
      strUsage += "  -maxsendbuffer=<n>     " + _("Maximum per-connection send buffer, <n>*1000 bytes (default: 1000)") + "\n";
  #ifdef USE_UPNP
  #if USE_UPNP
      strUsage += "  -upnp                  " + _("Use UPnP to map the listening port (default: 1 when listening)") + "\n";
  #else
      strUsage += "  -upnp                  " + _("Use UPnP to map the listening port (default: 0)") + "\n";
  #endif
  #endif
      strUsage += "  -detachdb              " + _("Detach block and address databases. Increases shutdown time (default: 0)") + "\n";
      strUsage += "  -paytxfee=<amt>        " + _("Fee per KB to add to transactions you send") + "\n";
      strUsage += "  -mininput=<amt>        " + _("When creating transactions, ignore inputs with value less than this (default: 0.01)") + "\n";
      if (!fHaveGUI)
      {
          strUsage += "  -server                " + _("Accept command line and JSON-RPC commands") + "\n";
          strUsage += "  -cli                   " + _("Simple command line interface - if not run as daemon") + "\n";
      };
  
  #if !defined(WIN32)
      if (!fHaveGUI)
          strUsage += "  -daemon                " + _("Run in the background as a daemon and accept commands") + "\n";
  #endif
      strUsage += "  -testnet               " + _("Use the test network") + "\n";
      strUsage += "  -debug                 " + _("Output extra debugging information. Implies all other -debug* options") + "\n";
      strUsage += "  -debugnet              " + _("Output extra network debugging information") + "\n";
      strUsage += "  -debugchain            " + _("Output extra blockchain debugging information") + "\n";
      strUsage += "  -debugpos              " + _("Output extra Proof of Stake debugging information") + "\n";
      strUsage += "  -logtimestamps         " + _("Prepend debug output with timestamp") + "\n";
      strUsage += "  -shrinkdebugfile       " + _("Shrink debug.log file on client startup (default: 1 when no -debug)") + "\n";
      strUsage += "  -printtoconsole        " + _("Send trace/debug info to console instead of debug.log file") + "\n";
      strUsage += "  -printtodebuglog       " + _("Send trace/debug info to debug.log file") + "\n";
      strUsage += "  -rpcuser=<user>        " + _("Username for JSON-RPC connections") + "\n";
      strUsage += "  -rpcpassword=<pw>      " + _("Password for JSON-RPC connections") + "\n";
      strUsage += "  -rpcport=<port>        " + _("Listen for JSON-RPC connections on <port> (default: 33556 or testnet: 36556)") + "\n";
      strUsage += "  -rpcallowip=<ip>       " + _("Allow JSON-RPC connections from specified IP address") + "\n";
      
      if (!fHaveGUI)
      {
          strUsage += "  -rpcconnect=<ip>       " + _("Send commands to node running on <ip> (default: 127.0.0.1)") + "\n";
          strUsage += "  -rpcwait               " + _("Wait for RPC server to start") + "\n";
      };
      
      strUsage += "  -blocknotify=<cmd>     " + _("Execute command when the best block changes (%s in cmd is replaced by block hash)") + "\n";
      strUsage += "  -walletnotify=<cmd>    " + _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)") + "\n";
      strUsage += "  -confchange            " + _("Require a confirmations for change (default: 0)") + "\n";
      strUsage += "  -enforcecanonical      " + _("Enforce transaction scripts to use canonical PUSH operators (default: 1)") + "\n";
      strUsage += "  -alertnotify=<cmd>     " + _("Execute command when a relevant alert is received (%s in cmd is replaced by message)") + "\n";
      strUsage += "  -upgradewallet         " + _("Upgrade wallet to latest format") + "\n";
      strUsage += "  -keypool=<n>           " + _("Set key pool size to <n> (default: 100)") + "\n";
      strUsage += "  -rescan                " + _("Rescan the block chain for missing wallet transactions") + "\n";
      strUsage += "  -salvagewallet         " + _("Attempt to recover private keys from a corrupt wallet.dat") + "\n";
      strUsage += "  -checkblocks=<n>       " + _("How many blocks to check at startup (default: 2500, 0 = all)") + "\n";
      strUsage += "  -checklevel=<n>        " + _("How thorough the block verification is (0-6, default: 1)") + "\n";
      strUsage += "  -loadblock=<file>      " + _("Imports blocks from external blk000?.dat file") + "\n";
      strUsage += "  -maxorphanblocksmib=<n> " + strprintf(_("Keep at most <n> MiB of unconnectable blocks in memory (default: %u)"), DEFAULT_MAX_ORPHAN_BLOCKS) + "\n";	
      strUsage += "  -reindex               " + _("Rebuild block chain index from current blk000?.dat files on startup") + "\n";
  
      strUsage += "\n" + _("Thin options:") + "\n";
      strUsage += "  -thinmode              " + _("Operate in less secure, less resource hungry 'thin' mode") + "\n";
      strUsage += "  -thinfullindex         " + _("Keep the entire block index in memory. (default: 0)") + "\n";
      strUsage += "  -thinindexmax=<n>      " + _("When not thinfullindex, the max number of block headers to keep in memory. (default: 4096)") + "\n";
  
      strUsage += "  -nothinssupport        " + _("Disable supporting thin nodes. (default: 0)") + "\n";
      strUsage += "  -nothinstealth         " + _("Disable forwarding, or requesting all stealth txns. (default: 0)") + "\n";
      strUsage += "  -maxthinpeers=<n>      " + _("Don't connect to more than <n> thin peers (default: 8)") + "\n";
  
      strUsage += "\n" + _("Block creation options:") + "\n";
      strUsage += "  -blockminsize=<n>      "   + _("Set minimum block size in bytes (default: 0)") + "\n";
      strUsage += "  -blockmaxsize=<n>      "   + _("Set maximum block size in bytes (default: 250000)") + "\n";
      strUsage += "  -blockprioritysize=<n> "   + _("Set maximum size of high-priority/low-fee transactions in bytes (default: 27000)") + "\n";
  
      strUsage += "\n" + _("SSL options: (see the Bitcoin Wiki for SSL setup instructions)") + "\n";
      strUsage += "  -rpcssl                                  " + _("Use OpenSSL (https) for JSON-RPC connections") + "\n";
      strUsage += "  -rpcsslcertificatechainfile=<file.cert>  " + _("Server certificate file (default: server.cert)") + "\n";
      strUsage += "  -rpcsslprivatekeyfile=<file.pem>         " + _("Server private key (default: server.pem)") + "\n";
      strUsage += "  -rpcsslciphers=<ciphers>                 " + _("Acceptable ciphers (default: TLSv1.2+HIGH:TLSv1+HIGH:!SSLv2:!aNULL:!eNULL:!3DES:@STRENGTH)") + "\n";
  
      strUsage += "\n" + _("Secure messaging options:") + "\n";
      strUsage += "  -nosmsg                                  " + _("Disable secure messaging.") + "\n";
      strUsage += "  -debugsmsg                               " + _("Log extra debug messages.") + "\n";
      strUsage += "  -smsgscanchain                           " + _("Scan the block chain for public key addresses on startup.") + "\n";
      
      return strUsage;
  }
  
  /** Sanity checks
   *  Ensure that Bitcoin is running in a usable environment with all
   *  necessary library support.
   */
  bool InitSanityCheck(void)
  {
      if (!ECC_InitSanityCheck())
      {
          InitError("OpenSSL appears to lack support for elliptic curve cryptography. For more "
                    "information, visit https://en.bitcoin.it/wiki/OpenSSL_and_EC_Libraries");
          return false;
      };
  
      // TODO: remaining sanity checks, see #4081
  
      return true;
  }
  
  /** Initialize bitcoin.
   *  @pre Parameters should be parsed and config file should be read.
   */
  bool AppInit2(boost::thread_group& threadGroup)
  {
      // ********************************************************* Step 1: setup
  #ifdef _MSC_VER
      // Turn off Microsoft heap dump noise
      _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
      _CrtSetReportFile(_CRT_WARN, CreateFileA("NUL", GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0));
  #endif
  #if _MSC_VER >= 1400
      // Disable confusing "helpful" text message on abort, Ctrl-C
      _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
  #endif
  #ifdef WIN32
      // Enable Data Execution Prevention (DEP)
      // Minimum supported OS versions: WinXP SP3, WinVista >= SP1, Win Server 2008
      // A failure is non-critical and needs no further attention!
  #ifndef PROCESS_DEP_ENABLE
  // We define this here, because GCCs winbase.h limits this to _WIN32_WINNT >= 0x0601 (Windows 7),
  // which is not correct. Can be removed, when GCCs winbase.h is fixed!
  #define PROCESS_DEP_ENABLE 0x00000001
  #endif
      typedef BOOL (WINAPI *PSETPROCDEPPOL)(DWORD);
      PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");
      if (setProcDEPPol != NULL) setProcDEPPol(PROCESS_DEP_ENABLE);
  #endif
  #ifndef WIN32
      umask(077);
  
      // Clean shutdown on SIGTERM
      struct sigaction sa;
      sa.sa_handler = HandleSIGTERM;
      sigemptyset(&sa.sa_mask);
      sa.sa_flags = 0;
      sigaction(SIGTERM, &sa, NULL);
      sigaction(SIGINT, &sa, NULL);
  
      // Reopen debug.log on SIGHUP
      struct sigaction sa_hup;
      sa_hup.sa_handler = HandleSIGHUP;
      sigemptyset(&sa_hup.sa_mask);
      sa_hup.sa_flags = 0;
      sigaction(SIGHUP, &sa_hup, NULL);
  #endif
  
      if (!CheckDiskSpace())
          return false;
  
      // ********************************************************* Step 2: parameter interactions
  
      nNodeLifespan = GetArg("-addrlifespan", 7);
  
      nMinStakeInterval = GetArg("-minstakeinterval", 0);
      nMinerSleep = GetArg("-minersleep", 500);
  
      fUseFastIndex = GetBoolArg("-fastindex", true);
  
      // Largest block you're willing to create.
      // Limit to betweeen 1K and MAX_BLOCK_SIZE-1K for sanity:
      nBlockMaxSize = GetArg("-blockmaxsize", MAX_BLOCK_SIZE_GEN/2);
      nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SIZE-1000), nBlockMaxSize));
  
      // How much of the block should be dedicated to high-priority transactions,
      // included regardless of the fees they pay
      nBlockPrioritySize = GetArg("-blockprioritysize", 27000);
      nBlockPrioritySize = std::min(nBlockMaxSize, nBlockPrioritySize);
  
      // Minimum block size you want to create; block will be filled with free transactions
      // until there are no more or the block reaches this size:
      nBlockMinSize = GetArg("-blockminsize", 0);
      nBlockMinSize = std::min(nBlockMaxSize, nBlockMinSize);
  
      // Fee-per-kilobyte amount considered the same as "free"
      // Be careful setting this: if you set it to zero then
      // a transaction spammer can cheaply fill blocks using
      // 1-satoshi-fee transactions. It should be set above the real
      // cost to you of processing a transaction.
      if (mapArgs.count("-mintxfee"))
          ParseMoney(mapArgs["-mintxfee"], nMinTxFee);
  
      if (fDebug)
          LogPrintf("nMinerSleep %u\n", nMinerSleep);
  
  
      nDerivationMethodIndex = 0;
  
      fTestNet = GetBoolArg("-testnet", false);
  
      if (!SelectParamsFromCommandLine())
          return InitError("Invalid combination of -testnet and -regtest.");
      
      if (!fHaveGUI && GetBoolArg("-cli", false))
          printf("Network: %s\n", Params().NetworkIDString().c_str());
      
      if (GetBoolArg("-thinmode"))
          nNodeMode = NT_THIN;
      
      if (fTestNet)
      {
          SoftSetBoolArg("-irc", true);
      };
  
      if (mapArgs.count("-bind"))
      {
          // when specifying an explicit binding address, you want to listen on it
          // even when -connect or -proxy is specified
          SoftSetBoolArg("-listen", true);
      };
  
      if (mapArgs.count("-connect") && mapMultiArgs["-connect"].size() > 0)
      {
          // when only connecting to trusted nodes, do not seed via DNS, or listen by default
          SoftSetBoolArg("-dnsseed", false);
          SoftSetBoolArg("-listen", false);
      }
  
      if (mapArgs.count("-proxy"))
      {
          // to protect privacy, do not listen by default if a proxy server is specified
          SoftSetBoolArg("-listen", false);
      };
  
      if (!GetBoolArg("-listen", true))
      {
          // do not map ports or try to retrieve public IP when not listening (pointless)
          SoftSetBoolArg("-upnp", false);
          SoftSetBoolArg("-discover", false);
      };
  
      if (mapArgs.count("-externalip"))
      {
          // if an explicit public IP is specified, do not try to find others
          SoftSetBoolArg("-discover", false);
      };
  
      if (GetBoolArg("-salvagewallet"))
      {
          // Rewrite just private keys: rescan to find transactions
          SoftSetBoolArg("-rescan", true);
      };
  
      if (fTestNet)
      {
          nStakeMinAge = 1 * 60 * 60; // test net min age is 1 hour
          nCoinbaseMaturity = 10; // test maturity is 10 blocks
          nStakeMinConfirmations = 10; // test maturity is 10 blocks
      };
  
      // ********************************************************* Step 3: parameter-to-internal-flags
      
      fDebug = !mapMultiArgs["-debug"].empty();
      // Special-case: if -debug=0/-nodebug is set, turn off debugging messages
      const std::vector<std::string>& categories = mapMultiArgs["-debug"];
      if (GetBoolArg("-nodebug", false) || std::find(categories.begin(), categories.end(), std::string("0")) != categories.end())
          fDebug = false;
      
      // -debug implies fDebug*, unless otherwise specified
      if (fDebug)
      {
          SoftSetBoolArg("-debugnet", true);
          SoftSetBoolArg("-debugsmsg", true);
          SoftSetBoolArg("-debugchain", true);
          SoftSetBoolArg("-debugringsig", true);
      };
  
      fDebugNet = GetBoolArg("-debugnet");
      fDebugSmsg = GetBoolArg("-debugsmsg");
      fDebugChain = GetBoolArg("-debugchain");
      fDebugRingSig = GetBoolArg("-debugringsig");
      fDebugPoS = GetBoolArg("-debugpos");
  
      fNoSmsg = GetBoolArg("-nosmsg");
      
      // Check for -socks - as this is a privacy risk to continue, exit here
      if (mapArgs.count("-socks"))
          return InitError(_("Error: Unsupported argument -socks found. Setting SOCKS version isn't possible anymore, only SOCKS5 proxies are supported."));
  
      bitdb.SetDetach(GetBoolArg("-detachdb", false));
      if (fDaemon)
          fServer = true;
      else
          fServer = GetBoolArg("-server", false);
  
      /* force fServer when running without GUI */
      if (!fHaveGUI)
          fServer = true;
  
      fPrintToConsole = GetBoolArg("-printtoconsole");
      fPrintToDebugLog = SoftSetBoolArg("-printtodebuglog", true);
      fLogTimestamps = GetBoolArg("-logtimestamps");
  
      if (mapArgs.count("-timeout"))
      {
          int nNewTimeout = GetArg("-timeout", 5000);
          if (nNewTimeout > 0 && nNewTimeout < 600000)
              nConnectTimeout = nNewTimeout;
      };
  
      if (mapArgs.count("-paytxfee"))
      {
          if (!ParseMoney(mapArgs["-paytxfee"], nTransactionFee))
              return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s'"), mapArgs["-paytxfee"].c_str()));
          if (nTransactionFee > 0.25 * COIN)
              InitWarning(_("Warning: -paytxfee is set very high! This is the transaction fee you will pay if you send a transaction."));
      };
  
      fConfChange = GetBoolArg("-confchange", false);
      fEnforceCanonical = GetBoolArg("-enforcecanonical", true);
  
      if (mapArgs.count("-mininput"))
      {
          if (!ParseMoney(mapArgs["-mininput"], nMinimumInputValue))
              return InitError(strprintf(_("Invalid amount for -mininput=<amount>: '%s'"), mapArgs["-mininput"].c_str()));
      };
  
  
      // ********************************************************* Step 4: application initialization: dir lock, daemonize, pidfile, debug log
      // Sanity check
      if (!InitSanityCheck())
          return InitError(_("Initialization sanity check failed. Neuron is shutting down."));
  
      
      std::string strDataDir = GetDataDir().string();
      std::string strWalletFileName = GetArg("-wallet", "wallet.dat");
  
      // strWalletFileName must be a plain filename without a directory
      if (strWalletFileName != fs::basename(strWalletFileName) + fs::extension(strWalletFileName))
          return InitError(strprintf(_("Wallet %s resides outside data directory %s."), strWalletFileName.c_str(), strDataDir.c_str()));
  
      // Make sure only a single Neuron process is using the data directory.
      fs::path pathLockFile = GetDataDir() / ".lock";
      FILE* file = fopen(pathLockFile.string().c_str(), "a"); // empty lock file; created if it doesn't exist.
      if (file)
          fclose(file);
  
      static boost::interprocess::file_lock lock(pathLockFile.string().c_str());
      if (!lock.try_lock())
          return InitError(strprintf(_("Cannot obtain a lock on data directory %s.  Neuron is probably already running."), strDataDir.c_str()));
      
      if (GetBoolArg("-shrinkdebugfile", !fDebug))
          ShrinkDebugFile();
  
      LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
      LogPrintf("Neuron version %s (%s)\n", FormatFullVersion().c_str(), CLIENT_DATE.c_str());
      LogPrintf("Operating in %s mode.\n", GetNodeModeName(nNodeMode));
      LogPrintf("Using OpenSSL version %s\n", SSLeay_version(SSLEAY_VERSION));
  
      if (!fLogTimestamps)
          LogPrintf("Startup time: %s\n", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
  
      LogPrintf("Default data directory %s\n", GetDefaultDataDir().string().c_str());
      LogPrintf("Used data directory %s\n", strDataDir.c_str());
  
      std::ostringstream strErrors;
  
      if (fDaemon)
      {
          fprintf(stdout, "Neuron server starting\n");
          fflush(stdout);
      };
      
      int64_t nStart;
  
  
  
      /* *********************************************************
          Step 4.5: adjust parameters for nNodeMode
      ********************************************************* */
  
      switch (nNodeMode)
      {
          case NT_FULL:
              if (GetBoolArg("-nothinssupport"))
              {
                  LogPrintf("Thin support disabled.\n");
                  nLocalServices &= ~(THIN_SUPPORT);
              };
  
              if (GetBoolArg("-nothinstealth"))
              {
                  LogPrintf("Thin stealth support disabled.\n");
                  nLocalServices &= ~(THIN_STEALTH);
              };
              break;
          case NT_THIN:
              SetBoolArg("-staking", false);
  
              // -- clear services
              nLocalServices &= ~(NODE_NETWORK);
              nLocalServices &= ~(THIN_SUPPORT);
              nLocalServices &= ~(THIN_STAKE);
              nLocalServices &= ~(THIN_STEALTH);
  
              nLocalRequirements |= (THIN_SUPPORT);
  
              if (GetBoolArg("-thinfullindex"))
              {
                  LogPrintf("Thin full index enabled.\n");
                  fThinFullIndex = true;
              } else
              {
                  nThinIndexWindow = GetArg("-thinindexmax", 4096);
  
                  if (nThinIndexWindow < 4096)
                  {
                      LogPrintf("Thin index window minimum size is %d.\n", 4096);
                      nThinIndexWindow = 4096;
                  };
  
                  LogPrintf("Thin index window size %d.\n", nThinIndexWindow);
              };
  
              if (GetBoolArg("-nothinstealth"))
              {
                  LogPrintf("Thin stealth disabled.\n");
              } else
              {
                  nLocalRequirements |= (THIN_STEALTH);
              };
  
              break;
          default:
              break;
      };
  
      // -- thin and full
      if (fNoSmsg)
          nLocalServices &= ~(SMSG_RELAY);
  
      if (initialiseRingSigs() != 0)
          return InitError("initialiseRingSigs() failed.");
  
      // ********************************************************* Step 5: verify database integrity
  
      uiInterface.InitMessage(_("Verifying database integrity..."));
  
      if (!bitdb.Open(GetDataDir()))
      {
          std::string msg = strprintf(_("Error initializing database environment %s!"
              " To recover, BACKUP THAT DIRECTORY, then remove"
              " everything from it except for wallet.dat."), strDataDir.c_str());
          return InitError(msg);
      };
  
      if (GetBoolArg("-salvagewallet"))
      {
          // Recover readable keypairs:
          if (!CWalletDB::Recover(bitdb, strWalletFileName, true))
              return false;
      };
  
      if (fs::exists(GetDataDir() / strWalletFileName))
      {
          CDBEnv::VerifyResult r = bitdb.Verify(strWalletFileName, CWalletDB::Recover);
          if (r == CDBEnv::RECOVER_OK)
          {
              std::string msg = strprintf(_("Warning: wallet.dat corrupt, data salvaged!"
                  " Original wallet.dat saved as wallet.{timestamp}.bak in %s; if"
                  " your balance or transactions are incorrect you should"
                  " restore from a backup."), strDataDir.c_str());
              uiInterface.ThreadSafeMessageBox(msg, _("Neuron"), CClientUIInterface::BTN_OK | CClientUIInterface::ICON_WARNING | CClientUIInterface::MODAL);
          };
  
          if (r == CDBEnv::RECOVER_FAIL)
              return InitError(_("wallet.dat corrupt, salvage failed"));
      };
  
      // ********************************************************* Step 6: network initialization
  
      nMaxThinPeers = GetArg("-maxthinpeers", 8);
  
      nBloomFilterElements = GetArg("-bloomfilterelements", 1536);
  
      if (mapArgs.count("-onlynet"))
      {
          std::set<enum Network> nets;
          BOOST_FOREACH(std::string snet, mapMultiArgs["-onlynet"])
          {
              enum Network net = ParseNetwork(snet);
              if (net == NET_UNROUTABLE)
                  return InitError(strprintf(_("Unknown network specified in -onlynet: '%s'"), snet.c_str()));
              nets.insert(net);
          };
          for (int n = 0; n < NET_MAX; n++)
          {
              enum Network net = (enum Network)n;
              if (!nets.count(net))
                  SetLimited(net);
          };
      };
  
      CService addrProxy;
      bool fProxy = false;
      if (mapArgs.count("-proxy")) {
          addrProxy = CService(mapArgs["-proxy"], 9050);
          if (!addrProxy.IsValid())
              return InitError(strprintf(_("Invalid -proxy address: '%s'"), mapArgs["-proxy"]));
          
          SetProxy(NET_IPV4, addrProxy);
          SetProxy(NET_IPV6, addrProxy);
          SetNameProxy(addrProxy);
          fProxy = true;
      }
  
      // -tor can override normal proxy, -notor disables tor entirely
      if (!(mapArgs.count("-tor") && mapArgs["-tor"] == "0") 
          && (fProxy || mapArgs.count("-tor")))
      {
          CService addrOnion;
          if (!mapArgs.count("-tor"))
              addrOnion = addrProxy;
          else
              addrOnion = CService(mapArgs["-tor"], 9050);
          if (!addrOnion.IsValid())
              return InitError(strprintf(_("Invalid -tor address: '%s'"), mapArgs["-tor"]));
          SetProxy(NET_TOR, addrOnion);
          SetReachable(NET_TOR);
      }
  
      // see Step 2: parameter interactions for more information about these
      fNoListen = !GetBoolArg("-listen", true);
      fDiscover = GetBoolArg("-discover", true);
      fNameLookup = GetBoolArg("-dns", true);
  #ifdef USE_UPNP
      fUseUPnP = GetBoolArg("-upnp", USE_UPNP);
  #endif
  
      bool fBound = false;
      if (!fNoListen)
      {
          std::string strError;
          if (mapArgs.count("-bind"))
          {
              BOOST_FOREACH(std::string strBind, mapMultiArgs["-bind"])
              {
                  CService addrBind;
                  if (!Lookup(strBind.c_str(), addrBind, GetListenPort(), false))
                      return InitError(strprintf(_("Cannot resolve -bind address: '%s'"), strBind.c_str()));
                  fBound |= Bind(addrBind);
              };
          } else
          {
              struct in_addr inaddr_any;
              inaddr_any.s_addr = INADDR_ANY;
              if (!IsLimited(NET_IPV6))
                  fBound |= Bind(CService(in6addr_any, GetListenPort()), false);
              if (!IsLimited(NET_IPV4))
                  fBound |= Bind(CService(inaddr_any, GetListenPort()), !fBound);
          };
          if (!fBound)
              return InitError(_("Failed to listen on any port. Use -listen=0 if you want this."));
      };
  
      if (mapArgs.count("-externalip"))
      {
          BOOST_FOREACH(std::string strAddr, mapMultiArgs["-externalip"])
          {
              CService addrLocal(strAddr, GetListenPort(), fNameLookup);
              if (!addrLocal.IsValid())
                  return InitError(strprintf(_("Cannot resolve -externalip address: '%s'"), strAddr.c_str()));
              AddLocal(CService(strAddr, GetListenPort(), fNameLookup), LOCAL_MANUAL);
          };
      };
  
      if (mapArgs.count("-reservebalance")) // ppcoin: reserve balance amount
      {
          if (!ParseMoney(mapArgs["-reservebalance"], nReserveBalance))
          {
              InitError(_("Invalid amount for -reservebalance=<amount>"));
              return false;
          };
      };
      
      BOOST_FOREACH(std::string strDest, mapMultiArgs["-seednode"])
          AddOneShot(strDest);
  
      // ********************************************************* Step 7: load blockchain
  
      if (!bitdb.Open(GetDataDir()))
      {
          std::string msg = strprintf(_("Error initializing database environment %s!"
                                   " To recover, BACKUP THAT DIRECTORY, then remove"
                                   " everything from it except for wallet.dat."), strDataDir.c_str());
          return InitError(msg);
      };
  
      if (GetBoolArg("-loadblockindextest"))
      {
          CTxDB txdb("r");
          txdb.LoadBlockIndex();
          PrintBlockTree();
          return false;
      };
  
      uiInterface.InitMessage(_("Loading block index..."));
      LogPrintf("Loading block index...\n");
      nStart = GetTimeMillis();
      
      // -- wipe the txdb if a reindex is queued
      if (mapArgs.count("-reindex"))
      {
          LOCK(cs_main);
          CTxDB txdb("cr+");
          txdb.RecreateDB();
      };
      
      switch (LoadBlockIndex())
      {
          case 1:
              return InitError(_("Error loading blkindex.dat"));
          case 2:
              if (nNodeMode == NT_FULL)
              {
                  LogPrintf("TxDb wiped, reindex requested.\n");
                  mapArgs["-reindex"] = 1;
              };
              break;
      };
      
      
      // as LoadBlockIndex can take several minutes, it's possible the user
      // requested to kill bitcoin-qt during the last operation. If so, exit.
      // As the program has not fully started yet, Shutdown() is possibly overkill.
      if (fRequestShutdown)
      {
          LogPrintf("Shutdown requested. Exiting.\n");
          return false;
      };
  
      LogPrintf(" block index %15dms\n", GetTimeMillis() - nStart);
  
      if (GetBoolArg("-printblockindex") || GetBoolArg("-printblocktree"))
      {
          PrintBlockTree();
          return false;
      };
  
      if (mapArgs.count("-printblock"))
      {
          std::string strMatch = mapArgs["-printblock"];
          int nFound = 0;
          for (std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
          {
              uint256 hash = (*mi).first;
              if (strncmp(hash.ToString().c_str(), strMatch.c_str(), strMatch.size()) == 0)
              {
                  CBlockIndex* pindex = (*mi).second;
                  CBlock block;
                  block.ReadFromDisk(pindex);
                  block.BuildMerkleTree();
                  block.print();
                  LogPrintf("\n");
                  nFound++;
              };
          };
          if (nFound == 0)
              LogPrintf("No blocks matching %s were found\n", strMatch.c_str());
          return false;
      };
  
      // ********************************************************* Step 8: load wallet
  
      uiInterface.InitMessage(_("Loading wallet..."));
      LogPrintf("Loading wallet...\n");
      nStart = GetTimeMillis();
      
      pwalletMain = new CWallet(strWalletFileName);
      DBErrors nLoadWalletRet = pwalletMain->LoadWallet();
  
      if (nLoadWalletRet != DB_LOAD_OK)
      {
          if (nLoadWalletRet == DB_CORRUPT)
          {
              strErrors << _("Error loading wallet.dat: Wallet corrupted") << "\n";
          } else
          if (nLoadWalletRet == DB_NONCRITICAL_ERROR)
          {
              std::string msg(_("Warning: error reading wallet.dat! All keys read correctly, but transaction data"
                           " or address book entries might be missing or incorrect."));
              uiInterface.ThreadSafeMessageBox(msg, _("Neuron"), CClientUIInterface::BTN_OK | CClientUIInterface::ICON_WARNING | CClientUIInterface::MODAL);
          } else
          if (nLoadWalletRet == DB_TOO_NEW)
          {
              strErrors << _("Error loading wallet.dat: Wallet requires newer version of Neuron") << "\n";
          } else
          if (nLoadWalletRet == DB_NEED_REWRITE)
          {
              strErrors << _("Wallet needed to be rewritten: restart Neuron to complete") << "\n";
              LogPrintf("%s", strErrors.str().c_str());
              return InitError(strErrors.str());
          } else
          {
              strErrors << _("Error loading wallet.dat") << "\n";
          };
      };
      
      // --- Prepare extended keys
      pwalletMain->ExtKeyLoadMaster();
      pwalletMain->ExtKeyLoadAccounts();
      pwalletMain->ExtKeyLoadAccountPacks();
      
      
      
      LogPrintf("%s", strErrors.str().c_str());
      LogPrintf(" wallet      %15dms\n", GetTimeMillis() - nStart);
  
  
      RegisterWallet(pwalletMain);
  
      CBlockIndex *pindexRescan = pindexBest;
      if (GetBoolArg("-rescan"))
      {
          pindexRescan = pindexGenesisBlock;
      } else
      {
          CWalletDB walletdb(strWalletFileName);
          CBlockLocator locator;
          if (walletdb.ReadBestBlock(locator))
              pindexRescan = locator.GetBlockIndex();
      };
  
      if (pindexBest != pindexRescan && pindexBest && pindexRescan && pindexBest->nHeight > pindexRescan->nHeight)
      {
          uiInterface.InitMessage(_("Rescanning..."));
          LogPrintf("Rescanning last %i blocks (from block %i)...\n", pindexBest->nHeight - pindexRescan->nHeight, pindexRescan->nHeight);
          nStart = GetTimeMillis();
          pwalletMain->ScanForWalletTransactions(pindexRescan, true);
          LogPrintf(" rescan      %15dms\n", GetTimeMillis() - nStart);
      };
  
  
      // ********************************************************* Step 9: import blocks
  
      std::vector<boost::filesystem::path> vImportFiles;
      if (mapArgs.count("-loadblock"))
      {
          BOOST_FOREACH(std::string strFile, mapMultiArgs["-loadblock"])
              vImportFiles.push_back(strFile);
      };
      threadGroup.create_thread(boost::bind(&ThreadImport, vImportFiles));
      
      if (mapArgs.count("-reindex"))
      {
          uiInterface.InitMessage(_("Reindexing from blk000?.dat files."));
          
          fReindexing = true;
          int nFile = 1;
          while (true) 
          {
              FILE* file = OpenBlockFile(false, nFile, 0, "rb");
              if (!file)
                  break;
              LogPrintf("Reindexing block file blk%04u.dat...\n", (unsigned int)nFile);
              LoadExternalBlockFile(nFile, file);
              nFile++;
          };
          
          LogPrintf("Terminating: reindex completed.\n");
          Finalise();
          exit(0);
      };
      
      // ********************************************************* Step 10: load peers
  
      uiInterface.InitMessage(_("Loading addresses..."));
      LogPrintf("Loading addresses...\n");
      nStart = GetTimeMillis();
  
      {
          CAddrDB adb;
          if (!adb.Read(addrman))
              LogPrintf("Invalid or missing peers.dat; recreating\n");
      }
  
      LogPrintf("Loaded %i addresses from peers.dat  %dms\n",
          addrman.size(), GetTimeMillis() - nStart);
  
  
      // ********************************************************* Step 10.1: startup secure messaging
  
      SecureMsgStart(fNoSmsg, GetBoolArg("-smsgscanchain"));
  
      // ********************************************************* Step 11: start node
  
      if (!CheckDiskSpace())
          return false;
  
      RandAddSeedPerfmon();
  
      //// debug print
      LogPrintf("mapBlockIndex.size() = %u\n",            mapBlockIndex.size());
      LogPrintf("mapBlockThinIndex.size() = %u\n",        mapBlockThinIndex.size());
      LogPrintf("nBestHeight = %d\n",                     nBestHeight);
      LogPrintf("setKeyPool.size() = %u\n",               pwalletMain->setKeyPool.size());
      LogPrintf("mapWallet.size() = %u\n",                pwalletMain->mapWallet.size());
      LogPrintf("mapAddressBook.size() = %u\n",           pwalletMain->mapAddressBook.size());
  
      StartNode(threadGroup);
      
      if (fServer)
          StartRPCThreads();
  
      // ********************************************************* Step 12: finished
      
      // Add wallet transactions that aren't already in a block to mapTransactions
      pwalletMain->ReacceptWalletTransactions();
      
      // Run a thread to flush wallet periodically
      threadGroup.create_thread(boost::bind(&TraceThread<void (*)(const std::string&), const std::string&>, "wflush", &ThreadFlushWalletDB, boost::ref(pwalletMain->strWalletFile)));
      
      InitRPCMining();
      
      // Mine proof-of-stake blocks in the background
      if (!GetBoolArg("-staking", true))
          LogPrintf("Staking disabled\n");
      else
          threadGroup.create_thread(boost::bind(&TraceThread<void (*)(CWallet*), CWallet*>, "miner", &ThreadStakeMiner, pwalletMain));
      
      if (nNodeMode != NT_FULL)
          pwalletMain->InitBloomFilter();
  
      uiInterface.InitMessage(_("Done loading"));
      LogPrintf("Done loading.\n");
  
      if (!strErrors.str().empty())
          return InitError(strErrors.str());
      
      LogPrintf("Network: %s, port: %d\n", Params().NetworkIDString(), Params().GetDefaultPort());
      
      return !fRequestShutdown;
  }
  