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 "bitcoinrpc.h"
  #include "net.h"
  #include "init.h"
  #include "util.h"
  #include "ui_interface.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
  
  using namespace std;
  using namespace boost;
  
  CWallet* pwalletMain;
  CClientUIInterface uiInterface;
  
  #ifdef WIN32
  // Win32 LevelDB doesn't use filedescriptors, and the ones used for
  // accessing block files, don't count towards to fd_set size limit
  // anyway.
  #define MIN_CORE_FILEDESCRIPTORS 0
  #else
  #define MIN_CORE_FILEDESCRIPTORS 150
  #endif
  
  // Used to pass flags to the Bind() function
  enum BindFlags {
      BF_NONE         = 0,
      BF_EXPLICIT     = (1U << 0),
      BF_REPORT_ERROR = (1U << 1)
  };
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // 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;
  
  void StartShutdown()
  {
      fRequestShutdown = true;
  }
  bool ShutdownRequested()
  {
      return fRequestShutdown;
  }
  
  static CCoinsViewDB *pcoinsdbview;
  
  void Shutdown()
  {
      printf("Shutdown : In progress...\n");
      static CCriticalSection cs_Shutdown;
      TRY_LOCK(cs_Shutdown, lockShutdown);
      if (!lockShutdown) return;
  
      RenameThread("bitcoin-shutoff");
      nTransactionsUpdated++;
      StopRPCThreads();
      ShutdownRPCMining();
      if (pwalletMain)
          bitdb.Flush(false);
      GenerateBitcoins(false, NULL);
      StopNode();
      {
          LOCK(cs_main);
          if (pwalletMain)
              pwalletMain->SetBestChain(CBlockLocator(pindexBest));
          if (pblocktree)
              pblocktree->Flush();
          if (pcoinsTip)
              pcoinsTip->Flush();
          delete pcoinsTip; pcoinsTip = NULL;
          delete pcoinsdbview; pcoinsdbview = NULL;
          delete pblocktree; pblocktree = NULL;
      }
      if (pwalletMain)
          bitdb.Flush(true);
      boost::filesystem::remove(GetPidFile());
      UnregisterWallet(pwalletMain);
      if (pwalletMain)
          delete pwalletMain;
      printf("Shutdown : done\n");
  }
  
  //
  // Signal handlers are very limited in what they are allowed to do, so:
  //
  void DetectShutdownThread(boost::thread_group* threadGroup)
  {
      // Tell the main threads to shutdown.
      while (!fRequestShutdown)
      {
          MilliSleep(200);
          if (fRequestShutdown)
              threadGroup->interrupt_all();
      }
  }
  
  void HandleSIGTERM(int)
  {
      fRequestShutdown = true;
  }
  
  void HandleSIGHUP(int)
  {
      fReopenDebugLog = true;
  }
  
  
  
  
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // Start
  //
  #if !defined(QT_GUI)
  bool AppInit(int argc, char* argv[])
  {
      boost::thread_group threadGroup;
      boost::thread* detectShutdownThread = NULL;
  
      bool fRet = false;
      try
      {
          //
          // Parameters
          //
          // If Qt is used, parameters/bitcoin.conf are parsed in qt/bitcoin.cpp's main()
          ParseParameters(argc, argv);
          if (!boost::filesystem::is_directory(GetDataDir(false)))
          {
              fprintf(stderr, "Error: Specified directory does not exist\n");
              Shutdown();
          }
          ReadConfigFile(mapArgs, mapMultiArgs);
  
          if (mapArgs.count("-?") || mapArgs.count("--help"))
          {
              // First part of help message is specific to bitcoind / RPC client
              std::string strUsage = _("ParallaxCoin version") + " " + FormatFullVersion() + "\n\n" +
                  _("Usage:") + "\n" +
                    "  parallaxcoind [options]                     " + "\n" +
                    "  parallaxcoind [options] <command> [params]  " + _("Send command to -server or parallaxcoind") + "\n" +
                    "  parallaxcoind [options] help                " + _("List commands") + "\n" +
                    "  parallaxcoind [options] help <command>      " + _("Get help for a command") + "\n";
  
              strUsage += "\n" + HelpMessage();
  
              fprintf(stdout, "%s", strUsage.c_str());
              return false;
          }
  
          // Command-line RPC
          for (int i = 1; i < argc; i++)
              if (!IsSwitchChar(argv[i][0]) && !boost::algorithm::istarts_with(argv[i], "parallaxcoin:"))
                  fCommandLine = true;
  
          if (fCommandLine)
          {
              int ret = CommandLineRPC(argc, argv);
              exit(ret);
          }
  #if !defined(WIN32)
          fDaemon = GetBoolArg("-daemon");
          if (fDaemon)
          {
              // Daemonize
              pid_t pid = fork();
              if (pid < 0)
              {
                  fprintf(stderr, "Error: fork() returned %d errno %d\n", pid, errno);
                  return false;
              }
              if (pid > 0) // Parent process, pid is child process id
              {
                  CreatePidFile(GetPidFile(), pid);
                  return true;
              }
              // Child process falls through to rest of initialization
  
              pid_t sid = setsid();
              if (sid < 0)
                  fprintf(stderr, "Error: setsid() returned %d errno %d\n", sid, errno);
          }
  #endif
  
          detectShutdownThread = new boost::thread(boost::bind(&DetectShutdownThread, &threadGroup));
          fRet = AppInit2(threadGroup);
      }
      catch (std::exception& e) {
          PrintExceptionContinue(&e, "AppInit()");
      } catch (...) {
          PrintExceptionContinue(NULL, "AppInit()");
      }
      if (!fRet) {
          if (detectShutdownThread)
              detectShutdownThread->interrupt();
          threadGroup.interrupt_all();
      }
  
      if (detectShutdownThread)
      {
          detectShutdownThread->join();
          delete detectShutdownThread;
          detectShutdownThread = NULL;
      }
      Shutdown();
  
      return fRet;
  }
  
  extern void noui_connect();
  int main(int argc, char* argv[])
  {
      bool fRet = false;
  
      // Connect bitcoind signal handlers
      noui_connect();
  
      fRet = AppInit(argc, argv);
  
      if (fRet && fDaemon)
          return 0;
  
      return (fRet ? 0 : 1);
  }
  #endif
  
  bool static InitError(const std::string &str)
  {
      uiInterface.ThreadSafeMessageBox(str, "", CClientUIInterface::MSG_ERROR);
      return false;
  }
  
  bool static InitWarning(const std::string &str)
  {
      uiInterface.ThreadSafeMessageBox(str, "", CClientUIInterface::MSG_WARNING);
      return true;
  }
  
  bool static Bind(const CService &addr, unsigned int flags) {
      if (!(flags & BF_EXPLICIT) && IsLimited(addr))
          return false;
      std::string strError;
      if (!BindListenPort(addr, strError)) {
          if (flags & BF_REPORT_ERROR)
              return InitError(strError);
          return false;
      }
      return true;
  }
  
  // Core-specific options shared between UI and daemon
  std::string HelpMessage()
  {
      string strUsage = _("Options:") + "\n" +
          "  -?                     " + _("This help message") + "\n" +
          "  -conf=<file>           " + _("Specify configuration file (default: parallaxcoin.conf)") + "\n" +
          "  -pid=<file>            " + _("Specify pid file (default: parallaxcoind.pid)") + "\n" +
          "  -gen                   " + _("Generate coins (default: 0)") + "\n" +
          "  -datadir=<dir>         " + _("Specify data directory") + "\n" +
          "  -dbcache=<n>           " + _("Set database cache size in megabytes (default: 25)") + "\n" +
          "  -timeout=<n>           " + _("Specify connection timeout in milliseconds (default: 5000)") + "\n" +
          "  -proxy=<ip:port>       " + _("Connect through socks proxy") + "\n" +
          "  -socks=<n>             " + _("Select the version of socks proxy to use (4-5, default: 5)") + "\n" +
          "  -tor=<ip:port>         " + _("Use proxy to reach tor hidden services (default: same as -proxy)") + "\n"
          "  -dns                   " + _("Allow DNS lookups for -addnode, -seednode and -connect") + "\n" +
          "  -port=<port>           " + _("Listen for connections on <port> (default: 7818 or testnet: 33328)") + "\n" +
          "  -maxconnections=<n>    " + _("Maintain at most <n> connections to peers (default: 125)") + "\n" +
          "  -addnode=<ip>          " + _("Add a node to connect to and attempt to keep the connection open") + "\n" +
          "  -connect=<ip>          " + _("Connect only to the specified node(s)") + "\n" +
          "  -seednode=<ip>         " + _("Connect to a node to retrieve peer addresses, and disconnect") + "\n" +
          "  -externalip=<ip>       " + _("Specify your own public address") + "\n" +
          "  -onlynet=<net>         " + _("Only connect to nodes in network <net> (IPv4, IPv6 or Tor)") + "\n" +
          "  -discover              " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n" +
          "  -checkpoints           " + _("Only accept block chain matching built-in checkpoints (default: 1)") + "\n" +
          "  -listen                " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n" +
          "  -bind=<addr>           " + _("Bind to given address and always listen on it. Use [host]:port notation for IPv6") + "\n" +
          "  -dnsseed               " + _("Find peers using DNS lookup (default: 1 unless -connect)") + "\n" +
          "  -banscore=<n>          " + _("Threshold for disconnecting misbehaving peers (default: 100)") + "\n" +
          "  -bantime=<n>           " + _("Number of seconds to keep misbehaving peers from reconnecting (default: 86400)") + "\n" +
          "  -maxreceivebuffer=<n>  " + _("Maximum per-connection receive buffer, <n>*1000 bytes (default: 5000)") + "\n" +
          "  -maxsendbuffer=<n>     " + _("Maximum per-connection send buffer, <n>*1000 bytes (default: 1000)") + "\n" +
          "  -bloomfilters          " + _("Allow peers to set bloom filters (default: 1)") + "\n" +
  #ifdef USE_UPNP
  #if USE_UPNP
          "  -upnp                  " + _("Use UPnP to map the listening port (default: 1 when listening)") + "\n" +
  #else
          "  -upnp                  " + _("Use UPnP to map the listening port (default: 0)") + "\n" +
  #endif
  #endif
          "  -paytxfee=<amt>        " + _("Fee per KB to add to transactions you send") + "\n" +
          "  -mininput=<amt>        " + _("When creating transactions, ignore inputs with value less than this (default: 0.0001)") + "\n" +
  #ifdef QT_GUI
          "  -server                " + _("Accept command line and JSON-RPC commands") + "\n" +
  #endif
  #if !defined(WIN32) && !defined(QT_GUI)
          "  -daemon                " + _("Run in the background as a daemon and accept commands") + "\n" +
  #endif
          "  -testnet               " + _("Use the test network") + "\n" +
          "  -debug                 " + _("Output extra debugging information. Implies all other -debug* options") + "\n" +
          "  -debugnet              " + _("Output extra network debugging information") + "\n" +
          "  -logtimestamps         " + _("Prepend debug output with timestamp (default: 1)") + "\n" +
          "  -shrinkdebugfile       " + _("Shrink debug.log file on client startup (default: 1 when no -debug)") + "\n" +
          "  -printtoconsole        " + _("Send trace/debug info to console instead of debug.log file") + "\n" +
  #ifdef WIN32
          "  -printtodebugger       " + _("Send trace/debug info to debugger") + "\n" +
  #endif
          "  -rpcuser=<user>        " + _("Username for JSON-RPC connections") + "\n" +
          "  -rpcpassword=<pw>      " + _("Password for JSON-RPC connections") + "\n" +
          "  -rpcport=<port>        " + _("Listen for JSON-RPC connections on <port> (default: 7817 or testnet: 33327)") + "\n" +
          "  -rpcallowip=<ip>       " + _("Allow JSON-RPC connections from specified IP address") + "\n" +
  #ifndef QT_GUI
          "  -rpcconnect=<ip>       " + _("Send commands to node running on <ip> (default: 127.0.0.1)") + "\n" +
  #endif
          "  -rpcthreads=<n>        " + _("Set the number of threads to service RPC calls (default: 4)") + "\n" +
          "  -blocknotify=<cmd>     " + _("Execute command when the best block changes (%s in cmd is replaced by block hash)") + "\n" +
          "  -walletnotify=<cmd>    " + _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)") + "\n" +
          "  -alertnotify=<cmd>     " + _("Execute command when a relevant alert is received (%s in cmd is replaced by message)") + "\n" +
          "  -upgradewallet         " + _("Upgrade wallet to latest format") + "\n" +
          "  -keypool=<n>           " + _("Set key pool size to <n> (default: 100)") + "\n" +
          "  -rescan                " + _("Rescan the block chain for missing wallet transactions") + "\n" +
          "  -salvagewallet         " + _("Attempt to recover private keys from a corrupt wallet.dat") + "\n" +
          "  -checkblocks=<n>       " + _("How many blocks to check at startup (default: 288, 0 = all)") + "\n" +
          "  -checklevel=<n>        " + _("How thorough the block verification is (0-4, default: 3)") + "\n" +
          "  -txindex               " + _("Maintain a full transaction index (default: 0)") + "\n" +
          "  -loadblock=<file>      " + _("Imports blocks from external blk000??.dat file") + "\n" +
          "  -reindex               " + _("Rebuild block chain index from current blk000??.dat files") + "\n" +
          "  -par=<n>               " + _("Set the number of script verification threads (up to 16, 0 = auto, <0 = leave that many cores free, default: 0)") + "\n" +
  
          "\n" + _("Block creation options:") + "\n" +
          "  -blockminsize=<n>      "   + _("Set minimum block size in bytes (default: 0)") + "\n" +
          "  -blockmaxsize=<n>      "   + _("Set maximum block size in bytes (default: 250000)") + "\n" +
          "  -blockprioritysize=<n> "   + _("Set maximum size of high-priority/low-fee transactions in bytes (default: 27000)") + "\n" +
  
          "\n" + _("SSL options: (see the ParallaxCoin Wiki for SSL setup instructions)") + "\n" +
          "  -rpcssl                                  " + _("Use OpenSSL (https) for JSON-RPC connections") + "\n" +
          "  -rpcsslcertificatechainfile=<file.cert>  " + _("Server certificate file (default: server.cert)") + "\n" +
          "  -rpcsslprivatekeyfile=<file.pem>         " + _("Server private key (default: server.pem)") + "\n" +
          "  -rpcsslciphers=<ciphers>                 " + _("Acceptable ciphers (default: TLSv1+HIGH:!SSLv2:!aNULL:!eNULL:!AH:!3DES:@STRENGTH)") + "\n";
  
      return strUsage;
  }
  
  struct CImportingNow
  {
      CImportingNow() {
          assert(fImporting == false);
          fImporting = true;
      }
  
      ~CImportingNow() {
          assert(fImporting == true);
          fImporting = false;
      }
  };
  
  void ThreadImport(std::vector<boost::filesystem::path> vImportFiles)
  {
      RenameThread("bitcoin-loadblk");
  
      // -reindex
      if (fReindex) {
          CImportingNow imp;
          int nFile = 0;
          while (true) {
              CDiskBlockPos pos(nFile, 0);
              FILE *file = OpenBlockFile(pos, true);
              if (!file)
                  break;
              printf("Reindexing block file blk%05u.dat...\n", (unsigned int)nFile);
              LoadExternalBlockFile(file, &pos);
              nFile++;
          }
          pblocktree->WriteReindexing(false);
          fReindex = false;
          printf("Reindexing finished\n");
          // To avoid ending up in a situation without genesis block, re-try initializing (no-op if reindexing worked):
          InitBlockIndex();
      }
  
      // hardcoded $DATADIR/bootstrap.dat
      filesystem::path pathBootstrap = GetDataDir() / "bootstrap.dat";
      if (filesystem::exists(pathBootstrap)) {
          FILE *file = fopen(pathBootstrap.string().c_str(), "rb");
          if (file) {
              CImportingNow imp;
              filesystem::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";
              printf("Importing bootstrap.dat...\n");
              LoadExternalBlockFile(file);
              RenameOver(pathBootstrap, pathBootstrapOld);
          }
      }
  
      // -loadblock=
      BOOST_FOREACH(boost::filesystem::path &path, vImportFiles) {
          FILE *file = fopen(path.string().c_str(), "rb");
          if (file) {
              CImportingNow imp;
              printf("Importing %s...\n", path.string().c_str());
              LoadExternalBlockFile(file);
          }
      }
  }
  
  /** 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);
  
      // Initialize Windows Sockets
      WSADATA wsadata;
      int ret = WSAStartup(MAKEWORD(2,2), &wsadata);
      if (ret != NO_ERROR || LOBYTE(wsadata.wVersion ) != 2 || HIBYTE(wsadata.wVersion) != 2)
      {
          return InitError(strprintf("Error: Winsock library failed to start (WSAStartup returned error %d)", ret));
      }
  #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
  
      // ********************************************************* Step 2: parameter interactions
  
      fTestNet = GetBoolArg("-testnet");
      fBloomFilters = GetBoolArg("-bloomfilters", true);
      if (fBloomFilters)
          nLocalServices |= NODE_BLOOM;
  
      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);
      }
  
      // Make sure enough file descriptors are available
      int nBind = std::max((int)mapArgs.count("-bind"), 1);
      nMaxConnections = GetArg("-maxconnections", 125);
      nMaxConnections = std::max(std::min(nMaxConnections, (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS)), 0);
      int nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS);
      if (nFD < MIN_CORE_FILEDESCRIPTORS)
          return InitError(_("Not enough file descriptors available."));
      if (nFD - MIN_CORE_FILEDESCRIPTORS < nMaxConnections)
          nMaxConnections = nFD - MIN_CORE_FILEDESCRIPTORS;
  
      // ********************************************************* Step 3: parameter-to-internal-flags
  
      fDebug = GetBoolArg("-debug");
      fBenchmark = GetBoolArg("-benchmark");
  
      // -par=0 means autodetect, but nScriptCheckThreads==0 means no concurrency
      nScriptCheckThreads = GetArg("-par", 0);
      if (nScriptCheckThreads <= 0)
          nScriptCheckThreads += boost::thread::hardware_concurrency();
      if (nScriptCheckThreads <= 1)
          nScriptCheckThreads = 0;
      else if (nScriptCheckThreads > MAX_SCRIPTCHECK_THREADS)
          nScriptCheckThreads = MAX_SCRIPTCHECK_THREADS;
  
      // -debug implies fDebug*
      if (fDebug)
          fDebugNet = true;
      else
          fDebugNet = GetBoolArg("-debugnet");
  
      if (fDaemon)
          fServer = true;
      else
          fServer = GetBoolArg("-server");
  
      /* force fServer when running without GUI */
  #if !defined(QT_GUI)
      fServer = true;
  #endif
      fPrintToConsole = GetBoolArg("-printtoconsole");
      fPrintToDebugger = GetBoolArg("-printtodebugger");
      fLogTimestamps = GetBoolArg("-logtimestamps", true);
      bool fDisableWallet = GetBoolArg("-disablewallet", false);
  
      if (mapArgs.count("-timeout"))
      {
          int nNewTimeout = GetArg("-timeout", 5000);
          if (nNewTimeout > 0 && nNewTimeout < 600000)
              nConnectTimeout = nNewTimeout;
      }
  
      // Continue to put "/P2SH/" in the coinbase to monitor
      // BIP16 support.
      // This can be removed eventually...
      const char* pszP2SH = "/P2SH/";
      COINBASE_FLAGS << std::vector<unsigned char>(pszP2SH, pszP2SH+strlen(pszP2SH));
  
      // Fee-per-kilobyte amount considered the same as "free"
      // If you are mining, 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"))
      {
          int64 n = 0;
          if (ParseMoney(mapArgs["-mintxfee"], n) && n > 0)
              CTransaction::nMinTxFee = n;
          else
              return InitError(strprintf(_("Invalid amount for -mintxfee=<amount>: '%s'"), mapArgs["-mintxfee"].c_str()));
      }
      if (mapArgs.count("-minrelaytxfee"))
      {
          int64 n = 0;
          if (ParseMoney(mapArgs["-minrelaytxfee"], n) && n > 0)
              CTransaction::nMinRelayTxFee = n;
          else
              return InitError(strprintf(_("Invalid amount for -minrelaytxfee=<amount>: '%s'"), mapArgs["-minrelaytxfee"].c_str()));
      }
  
      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."));
      }
  
      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
  
      std::string strDataDir = GetDataDir().string();
  
      // Make sure only a single Bitcoin process is using the data directory.
      boost::filesystem::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. ParallaxCoin is probably already running."), strDataDir.c_str()));
  
      if (GetBoolArg("-shrinkdebugfile", !fDebug))
          ShrinkDebugFile();
      printf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
      printf("ParallaxCoin version %s (%s)\n", FormatFullVersion().c_str(), CLIENT_DATE.c_str());
      printf("Using OpenSSL version %s\n", SSLeay_version(SSLEAY_VERSION));
      if (!fLogTimestamps)
          printf("Startup time: %s\n", DateTimeStrFormat("%Y-%m-%d %H:%M:%S", GetTime()).c_str());
      printf("Default data directory %s\n", GetDefaultDataDir().string().c_str());
      printf("Using data directory %s\n", strDataDir.c_str());
      printf("Using at most %i connections (%i file descriptors available)\n", nMaxConnections, nFD);
      std::ostringstream strErrors;
  
      if (fDaemon)
          fprintf(stdout, "ParallaxCoin server starting\n");
  
      if (nScriptCheckThreads) {
          printf("Using %u threads for script verification\n", nScriptCheckThreads);
          for (int i=0; i<nScriptCheckThreads-1; i++)
              threadGroup.create_thread(&ThreadScriptCheck);
      }
  
      int64 nStart;
  
  #if defined(USE_SSE2)
      scrypt_detect_sse2();
  #endif
  
      // ********************************************************* Step 5: verify wallet database integrity
  
      if (!fDisableWallet) {
          uiInterface.InitMessage(_("Verifying wallet..."));
  
          if (!bitdb.Open(GetDataDir()))
          {
              // try moving the database env out of the way
              boost::filesystem::path pathDatabase = GetDataDir() / "database";
              boost::filesystem::path pathDatabaseBak = GetDataDir() / strprintf("database.%"PRI64d".bak", GetTime());
              try {
                  boost::filesystem::rename(pathDatabase, pathDatabaseBak);
                  printf("Moved old %s to %s. Retrying.\n", pathDatabase.string().c_str(), pathDatabaseBak.string().c_str());
              } catch(boost::filesystem::filesystem_error &error) {
                   // failure is ok (well, not really, but it's not worse than what we started with)
              }
  
              // try again
              if (!bitdb.Open(GetDataDir())) {
                  // if it still fails, it probably means we can't even create the database env
                  string msg = strprintf(_("Error initializing wallet database environment %s!"), strDataDir.c_str());
                  return InitError(msg);
              }
          }
  
          if (GetBoolArg("-salvagewallet"))
          {
              // Recover readable keypairs:
              if (!CWalletDB::Recover(bitdb, "wallet.dat", true))
                  return false;
          }
  
          if (filesystem::exists(GetDataDir() / "wallet.dat"))
          {
              CDBEnv::VerifyResult r = bitdb.Verify("wallet.dat", CWalletDB::Recover);
              if (r == CDBEnv::RECOVER_OK)
              {
                  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());
                  InitWarning(msg);
              }
              if (r == CDBEnv::RECOVER_FAIL)
                  return InitError(_("wallet.dat corrupt, salvage failed"));
          }
      } // (!fDisableWallet)
  
      // ********************************************************* Step 6: network initialization
  
      int nSocksVersion = GetArg("-socks", 5);
      if (nSocksVersion != 4 && nSocksVersion != 5)
          return InitError(strprintf(_("Unknown -socks proxy version requested: %i"), nSocksVersion));
  
      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);
          }
      }
  #if defined(USE_IPV6)
  #if ! USE_IPV6
      else
          SetLimited(NET_IPV6);
  #endif
  #endif
  
      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"].c_str()));
  
          if (!IsLimited(NET_IPV4))
              SetProxy(NET_IPV4, addrProxy, nSocksVersion);
          if (nSocksVersion > 4) {
  #ifdef USE_IPV6
              if (!IsLimited(NET_IPV6))
                  SetProxy(NET_IPV6, addrProxy, nSocksVersion);
  #endif
              SetNameProxy(addrProxy, nSocksVersion);
          }
          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"].c_str()));
          SetProxy(NET_TOR, addrOnion, 5);
          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);
  
      bool fBound = false;
      if (!fNoListen) {
          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, (BF_EXPLICIT | BF_REPORT_ERROR));
              }
          }
          else {
              struct in_addr inaddr_any;
              inaddr_any.s_addr = INADDR_ANY;
  #ifdef USE_IPV6
              fBound |= Bind(CService(in6addr_any, GetListenPort()), BF_NONE);
  #endif
              fBound |= Bind(CService(inaddr_any, GetListenPort()), !fBound ? BF_REPORT_ERROR : BF_NONE);
          }
          if (!fBound)
              return InitError(_("Failed to listen on any port. Use -listen=0 if you want this."));
      }
  
      if (mapArgs.count("-externalip")) {
          BOOST_FOREACH(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);
          }
      }
  
      BOOST_FOREACH(string strDest, mapMultiArgs["-seednode"])
          AddOneShot(strDest);
  
      // ********************************************************* Step 7: load block chain
  
      fReindex = GetBoolArg("-reindex");
  
      // Upgrading to 0.8; hard-link the old blknnnn.dat files into /blocks/
      filesystem::path blocksDir = GetDataDir() / "blocks";
      if (!filesystem::exists(blocksDir))
      {
          filesystem::create_directories(blocksDir);
          bool linked = false;
          for (unsigned int i = 1; i < 10000; i++) {
              filesystem::path source = GetDataDir() / strprintf("blk%04u.dat", i);
              if (!filesystem::exists(source)) break;
              filesystem::path dest = blocksDir / strprintf("blk%05u.dat", i-1);
              try {
                  filesystem::create_hard_link(source, dest);
                  printf("Hardlinked %s -> %s\n", source.string().c_str(), dest.string().c_str());
                  linked = true;
              } catch (filesystem::filesystem_error & e) {
                  // Note: hardlink creation failing is not a disaster, it just means
                  // blocks will get re-downloaded from peers.
                  printf("Error hardlinking blk%04u.dat : %s\n", i, e.what());
                  break;
              }
          }
          if (linked)
          {
              fReindex = true;
          }
      }
  
      // cache size calculations
      size_t nTotalCache = GetArg("-dbcache", 25) << 20;
      if (nTotalCache < (1 << 22))
          nTotalCache = (1 << 22); // total cache cannot be less than 4 MiB
      size_t nBlockTreeDBCache = nTotalCache / 8;
      if (nBlockTreeDBCache > (1 << 21) && !GetBoolArg("-txindex", false))
          nBlockTreeDBCache = (1 << 21); // block tree db cache shouldn't be larger than 2 MiB
      nTotalCache -= nBlockTreeDBCache;
      size_t nCoinDBCache = nTotalCache / 2; // use half of the remaining cache for coindb cache
      nTotalCache -= nCoinDBCache;
      nCoinCacheSize = nTotalCache / 300; // coins in memory require around 300 bytes
  
      bool fLoaded = false;
      while (!fLoaded) {
          bool fReset = fReindex;
          std::string strLoadError;
  
          uiInterface.InitMessage(_("Loading block index..."));
  
          nStart = GetTimeMillis();
          do {
              try {
                  UnloadBlockIndex();
                  delete pcoinsTip;
                  delete pcoinsdbview;
                  delete pblocktree;
  
                  pblocktree = new CBlockTreeDB(nBlockTreeDBCache, false, fReindex);
                  pcoinsdbview = new CCoinsViewDB(nCoinDBCache, false, fReindex);
                  pcoinsTip = new CCoinsViewCache(*pcoinsdbview);
  
                  if (fReindex)
                      pblocktree->WriteReindexing(true);
  
                  if (!LoadBlockIndex()) {
                      strLoadError = _("Error loading block database");
                      break;
                  }
  
                  // If the loaded chain has a wrong genesis, bail out immediately
                  // (we're likely using a testnet datadir, or the other way around).
                  if (!mapBlockIndex.empty() && pindexGenesisBlock == NULL)
                      return InitError(_("Incorrect or no genesis block found. Wrong datadir for network?"));
  
                  // Initialize the block index (no-op if non-empty database was already loaded)
                  if (!InitBlockIndex()) {
                      strLoadError = _("Error initializing block database");
                      break;
                  }
  
                  // Check for changed -txindex state
                  if (fTxIndex != GetBoolArg("-txindex", false)) {
                      strLoadError = _("You need to rebuild the database using -reindex to change -txindex");
                      break;
                  }
  
                  uiInterface.InitMessage(_("Verifying blocks..."));
                  if (!VerifyDB(GetArg("-checklevel", 3),
                                GetArg( "-checkblocks", 288))) {
                      strLoadError = _("Corrupted block database detected");
                      break;
                  }
              } catch(std::exception &e) {
                  strLoadError = _("Error opening block database");
                  break;
              }
  
              fLoaded = true;
          } while(false);
  
          if (!fLoaded) {
              // first suggest a reindex
              if (!fReset) {
                  bool fRet = uiInterface.ThreadSafeMessageBox(
                      strLoadError + ".\n\n" + _("Do you want to rebuild the block database now?"),
                      "", CClientUIInterface::MSG_ERROR | CClientUIInterface::BTN_ABORT);
                  if (fRet) {
                      fReindex = true;
                      fRequestShutdown = false;
                  } else {
                      return false;
                  }
              } else {
                  return InitError(strLoadError);
              }
          }
      }
  
      // 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)
      {
          printf("Shutdown requested. Exiting.\n");
          return false;
      }
      printf(" block index %15"PRI64d"ms\n", GetTimeMillis() - nStart);
  
      if (GetBoolArg("-printblockindex") || GetBoolArg("-printblocktree"))
      {
          PrintBlockTree();
          return false;
      }
  
      if (mapArgs.count("-printblock"))
      {
          string strMatch = mapArgs["-printblock"];
          int nFound = 0;
          for (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();
                  printf("\n");
                  nFound++;
              }
          }
          if (nFound == 0)
              printf("No blocks matching %s were found\n", strMatch.c_str());
          return false;
      }
  
      // ********************************************************* Step 8: load wallet
  
      if (fDisableWallet) {
          printf("Wallet disabled!\n");
          pwalletMain = NULL;
      } else {
          uiInterface.InitMessage(_("Loading wallet..."));
  
          nStart = GetTimeMillis();
          bool fFirstRun = true;
          pwalletMain = new CWallet("wallet.dat");
          DBErrors nLoadWalletRet = pwalletMain->LoadWallet(fFirstRun);
          if (nLoadWalletRet != DB_LOAD_OK)
          {
              if (nLoadWalletRet == DB_CORRUPT)
                  strErrors << _("Error loading wallet.dat: Wallet corrupted") << "\n";
              else if (nLoadWalletRet == DB_NONCRITICAL_ERROR)
              {
                  string msg(_("Warning: error reading wallet.dat! All keys read correctly, but transaction data"
                               " or address book entries might be missing or incorrect."));
                  InitWarning(msg);
              }
              else if (nLoadWalletRet == DB_TOO_NEW)
                  strErrors << _("Error loading wallet.dat: Wallet requires newer version of ParallaxCoin") << "\n";
              else if (nLoadWalletRet == DB_NEED_REWRITE)
              {
                  strErrors << _("Wallet needed to be rewritten: restart ParallaxCoin to complete") << "\n";
                  printf("%s", strErrors.str().c_str());
                  return InitError(strErrors.str());
              }
              else
                  strErrors << _("Error loading wallet.dat") << "\n";
          }
  
          if (GetBoolArg("-upgradewallet", fFirstRun))
          {
              int nMaxVersion = GetArg("-upgradewallet", 0);
              if (nMaxVersion == 0) // the -upgradewallet without argument case
              {
                  printf("Performing wallet upgrade to %i\n", FEATURE_LATEST);
                  nMaxVersion = CLIENT_VERSION;
                  pwalletMain->SetMinVersion(FEATURE_LATEST); // permanently upgrade the wallet immediately
              }
              else
                  printf("Allowing wallet upgrade up to %i\n", nMaxVersion);
              if (nMaxVersion < pwalletMain->GetVersion())
                  strErrors << _("Cannot downgrade wallet") << "\n";
              pwalletMain->SetMaxVersion(nMaxVersion);
          }
  
          if (fFirstRun)
          {
              // Create new keyUser and set as default key
              RandAddSeedPerfmon();
  
              CPubKey newDefaultKey;
              if (pwalletMain->GetKeyFromPool(newDefaultKey, false)) {
                  pwalletMain->SetDefaultKey(newDefaultKey);
                  if (!pwalletMain->SetAddressBookName(pwalletMain->vchDefaultKey.GetID(), ""))
                      strErrors << _("Cannot write default address") << "\n";
              }
  
              pwalletMain->SetBestChain(CBlockLocator(pindexBest));
          }
  
          printf("%s", strErrors.str().c_str());
          printf(" wallet      %15"PRI64d"ms\n", GetTimeMillis() - nStart);
  
          RegisterWallet(pwalletMain);
  
          CBlockIndex *pindexRescan = pindexBest;
          if (GetBoolArg("-rescan"))
              pindexRescan = pindexGenesisBlock;
          else
          {
              CWalletDB walletdb("wallet.dat");
              CBlockLocator locator;
              if (walletdb.ReadBestBlock(locator))
                  pindexRescan = locator.GetBlockIndex();
              else
                  pindexRescan = pindexGenesisBlock;
          }
          if (pindexBest && pindexBest != pindexRescan)
          {
              uiInterface.InitMessage(_("Rescanning..."));
              printf("Rescanning last %i blocks (from block %i)...\n", pindexBest->nHeight - pindexRescan->nHeight, pindexRescan->nHeight);
              nStart = GetTimeMillis();
              pwalletMain->ScanForWalletTransactions(pindexRescan, true);
              printf(" rescan      %15"PRI64d"ms\n", GetTimeMillis() - nStart);
              pwalletMain->SetBestChain(CBlockLocator(pindexBest));
              nWalletDBUpdated++;
          }
      } // (!fDisableWallet)
  
      // ********************************************************* Step 9: import blocks
  
      // scan for better chains in the block chain database, that are not yet connected in the active best chain
      CValidationState state;
      if (!ConnectBestBlock(state))
          strErrors << "Failed to connect best block";
  
      std::vector<boost::filesystem::path> vImportFiles;
      if (mapArgs.count("-loadblock"))
      {
          BOOST_FOREACH(string strFile, mapMultiArgs["-loadblock"])
              vImportFiles.push_back(strFile);
      }
      threadGroup.create_thread(boost::bind(&ThreadImport, vImportFiles));
  
      // ********************************************************* Step 10: load peers
  
      uiInterface.InitMessage(_("Loading addresses..."));
  
      nStart = GetTimeMillis();
  
      {
          CAddrDB adb;
          if (!adb.Read(addrman))
              printf("Invalid or missing peers.dat; recreating\n");
      }
  
      printf("Loaded %i addresses from peers.dat  %"PRI64d"ms\n",
             addrman.size(), GetTimeMillis() - nStart);
  
      // ********************************************************* Step 11: start node
  
      if (!CheckDiskSpace())
          return false;
  
      if (!strErrors.str().empty())
          return InitError(strErrors.str());
  
      RandAddSeedPerfmon();
  
      //// debug print
      printf("mapBlockIndex.size() = %"PRIszu"\n",   mapBlockIndex.size());
      printf("nBestHeight = %d\n",                   nBestHeight);
      printf("setKeyPool.size() = %"PRIszu"\n",      pwalletMain ? pwalletMain->setKeyPool.size() : 0);
      printf("mapWallet.size() = %"PRIszu"\n",       pwalletMain ? pwalletMain->mapWallet.size() : 0);
      printf("mapAddressBook.size() = %"PRIszu"\n",  pwalletMain ? pwalletMain->mapAddressBook.size() : 0);
  
      StartNode(threadGroup);
  
      // InitRPCMining is needed here so getwork/getblocktemplate in the GUI debug console works properly.
      InitRPCMining();
      if (fServer)
          StartRPCThreads();
  
      // Generate coins in the background
      if (pwalletMain)
          GenerateBitcoins(GetBoolArg("-gen", false), pwalletMain);
  
      // ********************************************************* Step 12: finished
  
      uiInterface.InitMessage(_("Done loading"));
  
      if (pwalletMain) {
          // 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(&ThreadFlushWalletDB, boost::ref(pwalletMain->strWalletFile)));
      }
  
      return !fRequestShutdown;
  }
  