text: // Copyright (c) 2011-2014 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 "rpcconsole.h"
  #include "ui_rpcconsole.h"
  
  #include "clientmodel.h"
  #include "guiutil.h"
  #include "peertablemodel.h"
  #include "scicon.h"
  
  #include "main.h"
  #include "chainparams.h"
  #include "rpcserver.h"
  #include "rpcclient.h"
  #include "util.h"
  
  #include "json/json_spirit_value.h"
  
  #include <openssl/crypto.h>
  #include <db_cxx.h>
  
  #include <QKeyEvent>
  #include <QScrollBar>
  #include <QThread>
  #include <QTime>
  
  #if QT_VERSION < 0x050000
  #include <QUrl>
  #endif
  
  // TODO: add a scrollback limit, as there is currently none
  // TODO: make it possible to filter out categories (esp debug messages when implemented)
  // TODO: receive errors and debug messages through ClientModel
  
  const int CONSOLE_HISTORY = 50;
  const QSize ICON_SIZE(24, 24);
  
  const int INITIAL_TRAFFIC_GRAPH_MINS = 30;
  
  const struct {
      const char *url;
      const char *source;
  } ICON_MAPPING[] = {
      {"cmd-request", ":/icons/tx_input"},
      {"cmd-reply", ":/icons/tx_output"},
      {"cmd-error", ":/icons/tx_output"},
      {"misc", ":/icons/tx_inout"},
      {NULL, NULL}
  };
  
  /* Object for executing console RPC commands in a separate thread.
  */
  class RPCExecutor : public QObject
  {
      Q_OBJECT
  
  public slots:
      void request(const QString &command);
  
  signals:
      void reply(int category, const QString &command);
  };
  
  #include "rpcconsole.moc"
  
  /**
   * Split shell command line into a list of arguments. Aims to emulate \c bash and friends.
   *
   * - Arguments are delimited with whitespace
   * - Extra whitespace at the beginning and end and between arguments will be ignored
   * - Text can be "double" or 'single' quoted
   * - The backslash \c \ is used as escape character
   *   - Outside quotes, any character can be escaped
   *   - Within double quotes, only escape \c " and backslashes before a \c " or another backslash
   *   - Within single quotes, no escaping is possible and no special interpretation takes place
   *
   * @param[out]   args        Parsed arguments will be appended to this list
   * @param[in]    strCommand  Command line to split
   */
  bool parseCommandLine(std::vector<std::string> &args, const std::string &strCommand)
  {
      enum CmdParseState
      {
          STATE_EATING_SPACES,
          STATE_ARGUMENT,
          STATE_SINGLEQUOTED,
          STATE_DOUBLEQUOTED,
          STATE_ESCAPE_OUTER,
          STATE_ESCAPE_DOUBLEQUOTED
      } state = STATE_EATING_SPACES;
      std::string curarg;
      foreach(char ch, strCommand)
      {
          switch(state)
          {
          case STATE_ARGUMENT: // In or after argument
          case STATE_EATING_SPACES: // Handle runs of whitespace
              switch(ch)
              {
              case '"': state = STATE_DOUBLEQUOTED; break;
              case '\'': state = STATE_SINGLEQUOTED; break;
              case '\\': state = STATE_ESCAPE_OUTER; break;
              case ' ': case '\n': case '\t':
                  if(state == STATE_ARGUMENT) // Space ends argument
                  {
                      args.push_back(curarg);
                      curarg.clear();
                  }
                  state = STATE_EATING_SPACES;
                  break;
              default: curarg += ch; state = STATE_ARGUMENT;
              }
              break;
          case STATE_SINGLEQUOTED: // Single-quoted string
              switch(ch)
              {
              case '\'': state = STATE_ARGUMENT; break;
              default: curarg += ch;
              }
              break;
          case STATE_DOUBLEQUOTED: // Double-quoted string
              switch(ch)
              {
              case '"': state = STATE_ARGUMENT; break;
              case '\\': state = STATE_ESCAPE_DOUBLEQUOTED; break;
              default: curarg += ch;
              }
              break;
          case STATE_ESCAPE_OUTER: // '\' outside quotes
              curarg += ch; state = STATE_ARGUMENT;
              break;
          case STATE_ESCAPE_DOUBLEQUOTED: // '\' in double-quoted text
              if(ch != '"' && ch != '\\') curarg += '\\'; // keep '\' for everything but the quote and '\' itself
              curarg += ch; state = STATE_DOUBLEQUOTED;
              break;
          }
      }
      switch(state) // final state
      {
      case STATE_EATING_SPACES:
          return true;
      case STATE_ARGUMENT:
          args.push_back(curarg);
          return true;
      default: // ERROR to end in one of the other states
          return false;
      }
  }
  
  void RPCExecutor::request(const QString &command)
  {
      std::vector<std::string> args;
      if(!parseCommandLine(args, command.toStdString()))
      {
          emit reply(RPCConsole::CMD_ERROR, QString("Parse error: unbalanced ' or \""));
          return;
      }
      
      if(args.empty())
          return; // Nothing to do
      
      try
      {
          std::string strPrint;
          // Convert argument list to JSON objects in method-dependent way,
          // and pass it along with the method name to the dispatcher.
          json_spirit::Value result = tableRPC.execute(
              args[0],
              RPCConvertValues(args[0], std::vector<std::string>(args.begin() + 1, args.end())));
  
          // Format result reply
          if (result.type() == json_spirit::null_type)
              strPrint = "";
          else if (result.type() == json_spirit::str_type)
              strPrint = result.get_str();
          else
              strPrint = write_string(result, true);
  
          emit reply(RPCConsole::CMD_REPLY, QString::fromStdString(strPrint));
      } catch (const json_spirit::Object& objError)
      {
          try // Nice formatting for standard-format error
          {
              int code = find_value(objError, "code").get_int();
              std::string message = find_value(objError, "message").get_str();
              emit reply(RPCConsole::CMD_ERROR, QString::fromStdString(message) + " (code " + QString::number(code) + ")");
          } catch (const std::runtime_error&) // raised when converting to invalid type, i.e. missing code or message
          {   // Show raw JSON object
              emit reply(RPCConsole::CMD_ERROR, QString::fromStdString(write_string(json_spirit::Value(objError), false)));
          };
      } catch (const std::exception& e)
      {
          emit reply(RPCConsole::CMD_ERROR, QString("Error: ") + QString::fromStdString(e.what()));
      };
  }
  
  RPCConsole::RPCConsole(QWidget *parent) :
      QDialog(parent),
      ui(new Ui::RPCConsole),
      clientModel(0),
      historyPtr(0),
      cachedNodeid(-1)
  {
      ui->setupUi(this);
      //GUIUtil::restoreWindowGeometry("nRPCConsoleWindow", this->size(), this);
  
  #ifndef Q_OS_MAC
      ui->openDebugLogfileButton->setIcon(QIcon(":/icons/export"));
      ui->showCLOptionsButton->setIcon(QIcon(":/icons/options"));
  #endif
      ui->clearButton->setIcon(QIcon(":/icons/remove"));
      
      // Install event filter for up and down arrow
      ui->lineEdit->installEventFilter(this);
      ui->messagesWidget->installEventFilter(this);
  
      connect(ui->clearButton, SIGNAL(clicked()), this, SLOT(clear()));
      connect(ui->btnClearTrafficGraph, SIGNAL(clicked()), ui->trafficGraph, SLOT(clear()));
  
      // set library version labels
      ui->openSSLVersion->setText(SSLeay_version(SSLEAY_VERSION));
      ui->berkeleyDBVersion->setText(DbEnv::version(0, 0, 0));
  
      startExecutor();
      setTrafficGraphRange(INITIAL_TRAFFIC_GRAPH_MINS);
  
      ui->detailWidget->hide();
      ui->peerHeading->setText(tr("Select a peer to view detailed information."));
  
      clear();
  }
  
  RPCConsole::~RPCConsole()
  {
      //GUIUtil::saveWindowGeometry("nRPCConsoleWindow", this);
      emit stopExecutor();
      delete ui;
  }
  
  bool RPCConsole::eventFilter(QObject* obj, QEvent *event)
  {
      if(event->type() == QEvent::KeyPress) // Special key handling
      {
          QKeyEvent *keyevt = static_cast<QKeyEvent*>(event);
          int key = keyevt->key();
          Qt::KeyboardModifiers mod = keyevt->modifiers();
          switch(key)
          {
          case Qt::Key_Up: if(obj == ui->lineEdit) { browseHistory(-1); return true; } break;
          case Qt::Key_Down: if(obj == ui->lineEdit) { browseHistory(1); return true; } break;
          case Qt::Key_PageUp: /* pass paging keys to messages widget */
          case Qt::Key_PageDown:
              if(obj == ui->lineEdit)
              {
                  QApplication::postEvent(ui->messagesWidget, new QKeyEvent(*keyevt));
                  return true;
              }
              break;
          default:
              // Typing in messages widget brings focus to line edit, and redirects key there
              // Exclude most combinations and keys that emit no text, except paste shortcuts
              if(obj == ui->messagesWidget && (
                    (!mod && !keyevt->text().isEmpty() && key != Qt::Key_Tab) ||
                    ((mod & Qt::ControlModifier) && key == Qt::Key_V) ||
                    ((mod & Qt::ShiftModifier) && key == Qt::Key_Insert)))
              {
                  ui->lineEdit->setFocus();
                  QApplication::postEvent(ui->lineEdit, new QKeyEvent(*keyevt));
                  return true;
              }
          }
      }
      return QWidget::eventFilter(obj, event);
  }
  
  void RPCConsole::setClientModel(ClientModel *model)
  {
      clientModel = model;
      ui->trafficGraph->setClientModel(model);
      if(model)
      {
          // Keep up to date with client
          setNumConnections(model->getNumConnections());
          connect(model, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
  
          setNumBlocks(model->getNumBlocks(), model->getNumBlocksOfPeers());
          connect(model, SIGNAL(numBlocksChanged(int,int)), this, SLOT(setNumBlocks(int,int)));
  
          updateTrafficStats(model->getTotalBytesRecv(), model->getTotalBytesSent());
          connect(model, SIGNAL(bytesChanged(quint64,quint64)), this, SLOT(updateTrafficStats(quint64, quint64)));
  
          // set up peer table
          ui->peerWidget->setModel(model->getPeerTableModel());
          ui->peerWidget->verticalHeader()->hide();
          ui->peerWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
          ui->peerWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
          ui->peerWidget->setSelectionMode(QAbstractItemView::SingleSelection);
          ui->peerWidget->setColumnWidth(PeerTableModel::Address, ADDRESS_COLUMN_WIDTH);
          ui->peerWidget->setColumnWidth(PeerTableModel::Subversion, SUBVERSION_COLUMN_WIDTH);
          ui->peerWidget->setColumnWidth(PeerTableModel::Ping, PING_COLUMN_WIDTH);
  
          // connect the peerWidget selection model to our peerSelected() handler
          connect(ui->peerWidget->selectionModel(), SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),
               this, SLOT(peerSelected(const QItemSelection &, const QItemSelection &)));
          connect(model->getPeerTableModel(), SIGNAL(layoutChanged()), this, SLOT(peerLayoutChanged()));
  
          // Provide initial values
          ui->clientVersion->setText(model->formatFullVersion());
          ui->clientName->setText(model->clientName());
          ui->buildDate->setText(model->formatBuildDate());
          ui->startupTime->setText(model->formatClientStartupTime());
  
          ui->networkName->setText(QString::fromStdString(Params().NetworkIDString()));
      }
  }
  
  static QString categoryClass(int category)
  {
      switch(category)
      {
      case RPCConsole::CMD_REQUEST:  return "cmd-request"; break;
      case RPCConsole::CMD_REPLY:    return "cmd-reply"; break;
      case RPCConsole::CMD_ERROR:    return "cmd-error"; break;
      default:                       return "misc";
      }
  }
  
  void RPCConsole::clear()
  {
      ui->messagesWidget->clear();
      history.clear();
      historyPtr = 0;
      ui->lineEdit->clear();
      ui->lineEdit->setFocus();
      
      
      QColor colour(226, 29, 57);
      
      // Add smoothly scaled icon images.
      // (when using width/height on an img, Qt uses nearest instead of linear interpolation)
      for(int i=0; ICON_MAPPING[i].url; ++i)
      {
          ui->messagesWidget->document()->addResource(
                      QTextDocument::ImageResource,
                      QUrl(ICON_MAPPING[i].url),
                      SingleColorImage(ICON_MAPPING[i].source, colour).scaled(ICON_SIZE, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
      }
  
      // Set default style sheet
      ui->messagesWidget->document()->setDefaultStyleSheet(
                  "table { }"
                  "td.time { color: #808080; padding-top: 3px; } "
                  "td.message { font-family: Monospace; font-size: 12px; } "
                  "td.cmd-request { color: #006060; } "
                  "td.cmd-error { color: red; } "
                  "b { color: #006060; } "
                  );
  
      message(CMD_REPLY, (tr("Welcome to the NDC Core RPC console.") + "<br>" +
                          tr("Use up and down arrows to navigate history, and <b>Ctrl-L</b> to clear screen.") + "<br>" +
                          tr("Type <b>help</b> for an overview of available commands.")), true);
  }
  
  void RPCConsole::keyPressEvent(QKeyEvent *event)
  {
      if(windowType() != Qt::Widget && event->key() == Qt::Key_Escape)
      {
          close();
      }
  }
  
  void RPCConsole::message(int category, const QString &message, bool html)
  {
      QTime time = QTime::currentTime();
      QString timeString = time.toString();
      QString out;
      out += "<table><tr><td class=\"time\" width=\"65\">" + timeString + "</td>";
      out += "<td class=\"icon\" width=\"32\"><img src=\"" + categoryClass(category) + "\"></td>";
      out += "<td class=\"message " + categoryClass(category) + "\" valign=\"middle\">";
      if(html)
          out += message;
      else
          out += GUIUtil::HtmlEscape(message, true);
      out += "</td></tr></table>";
      ui->messagesWidget->append(out);
  }
  
  void RPCConsole::setNumConnections(int count)
  {
      if (!clientModel)
          return;
  
      QString connections = QString::number(count) + " (";
      connections += tr("In:") + " " + QString::number(clientModel->getNumConnections(CONNECTIONS_IN)) + " / ";
      connections += tr("Out:") + " " + QString::number(clientModel->getNumConnections(CONNECTIONS_OUT)) + ")";
  
      ui->numberOfConnections->setText(connections);
  }
  
  void RPCConsole::setNumBlocks(int count, int countOfPeers)
  {
      ui->numberOfBlocks->setText(QString::number(count));
      ui->totalBlocks->setText(QString::number(countOfPeers));
      QDateTime lastBlockDate;
      if (nNodeMode == NT_FULL)
          lastBlockDate = clientModel->getLastBlockDate();
      else
          lastBlockDate = clientModel->getLastBlockThinDate();
      ui->lastBlockTime->setText(lastBlockDate.toString());
  }
  
  void RPCConsole::on_lineEdit_returnPressed()
  {
      QString cmd = ui->lineEdit->text();
      ui->lineEdit->clear();
  
      if(!cmd.isEmpty())
      {
          message(CMD_REQUEST, cmd);
          emit cmdRequest(cmd);
          // Remove command, if already in history
          history.removeOne(cmd);
          // Append command to history
          history.append(cmd);
          // Enforce maximum history size
          while(history.size() > CONSOLE_HISTORY)
              history.removeFirst();
          // Set pointer to end of history
          historyPtr = history.size();
          // Scroll console view to end
          scrollToEnd();
      }
  }
  
  void RPCConsole::browseHistory(int offset)
  {
      historyPtr += offset;
      if(historyPtr < 0)
          historyPtr = 0;
      if(historyPtr > history.size())
          historyPtr = history.size();
      QString cmd;
      if(historyPtr < history.size())
          cmd = history.at(historyPtr);
      ui->lineEdit->setText(cmd);
  }
  
  void RPCConsole::startExecutor()
  {
      QThread *thread = new QThread;
      RPCExecutor *executor = new RPCExecutor();
      executor->moveToThread(thread);
  
      // Replies from executor object must go to this object
      connect(executor, SIGNAL(reply(int,QString)), this, SLOT(message(int,QString)));
      // Requests from this object must go to executor
      connect(this, SIGNAL(cmdRequest(QString)), executor, SLOT(request(QString)));
  
      // On stopExecutor signal
      // - queue executor for deletion (in execution thread)
      // - quit the Qt event loop in the execution thread
      connect(this, SIGNAL(stopExecutor()), executor, SLOT(deleteLater()));
      connect(this, SIGNAL(stopExecutor()), thread, SLOT(quit()));
      // Queue the thread for deletion (in this thread) when it is finished
      connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
  
      // Default implementation of QThread::run() simply spins up an event loop in the thread,
      // which is what we want.
      thread->start();
  }
  
  void RPCConsole::on_tabWidget_currentChanged(int index)
  {
      if(ui->tabWidget->widget(index) == ui->tab_console)
      {
          ui->lineEdit->setFocus();
      }
  }
  
  void RPCConsole::on_openDebugLogfileButton_clicked()
  {
      GUIUtil::openDebugLogfile();
  }
  
  void RPCConsole::showConfEditor()
  {
      GUIUtil::openConfigfile();
  }
  
  void RPCConsole::scrollToEnd()
  {
      QScrollBar *scrollbar = ui->messagesWidget->verticalScrollBar();
      scrollbar->setValue(scrollbar->maximum());
  }
  
  void RPCConsole::on_sldGraphRange_valueChanged(int value)
  {
      const int multiplier = 5; // each position on the slider represents 5 min
      int mins = value * multiplier;
      setTrafficGraphRange(mins);
  }
  
  QString RPCConsole::FormatBytes(quint64 bytes)
  {
      return QString::fromStdString(bytesReadable(bytes));
  }
  
  void RPCConsole::setTrafficGraphRange(int mins)
  {
      ui->trafficGraph->setGraphRangeMins(mins);
      ui->lblGraphRange->setText(GUIUtil::formatDurationStr(mins * 60));
  }
  
  void RPCConsole::updateTrafficStats(quint64 totalBytesIn, quint64 totalBytesOut)
  {
      ui->lblBytesIn->setText(FormatBytes(totalBytesIn));
      ui->lblBytesOut->setText(FormatBytes(totalBytesOut));
  }
  
  void RPCConsole::peerSelected(const QItemSelection &selected, const QItemSelection &deselected)
  {
      Q_UNUSED(deselected);
  
      if (!clientModel || selected.indexes().isEmpty())
          return;
  
      const CNodeCombinedStats *stats = clientModel->getPeerTableModel()->getNodeStats(selected.indexes().first().row());
      if (stats)
          updateNodeDetail(stats);
  }
  
  void RPCConsole::peerLayoutChanged()
  {
      if (!clientModel)
          return;
  
      const CNodeCombinedStats *stats = NULL;
      bool fUnselect = false;
      bool fReselect = false;
  
      if (cachedNodeid == -1) // no node selected yet
          return;
  
      // find the currently selected row
      int selectedRow;
      QModelIndexList selectedModelIndex = ui->peerWidget->selectionModel()->selectedIndexes();
      if (selectedModelIndex.isEmpty())
          selectedRow = -1;
      else
          selectedRow = selectedModelIndex.first().row();
  
      // check if our detail node has a row in the table (it may not necessarily
      // be at selectedRow since its position can change after a layout change)
      int detailNodeRow = clientModel->getPeerTableModel()->getRowByNodeId(cachedNodeid);
  
      if (detailNodeRow < 0)
      {
          // detail node dissapeared from table (node disconnected)
          fUnselect = true;
          cachedNodeid = -1;
          ui->detailWidget->hide();
          ui->peerHeading->setText(tr("Select a peer to view detailed information."));
      }
      else
      {
          if (detailNodeRow != selectedRow)
          {
              // detail node moved position
              fUnselect = true;
              fReselect = true;
          }
  
          // get fresh stats on the detail node.
          stats = clientModel->getPeerTableModel()->getNodeStats(detailNodeRow);
      }
  
      if (fUnselect && selectedRow >= 0)
      {
          ui->peerWidget->selectionModel()->select(QItemSelection(selectedModelIndex.first(), selectedModelIndex.last()),
              QItemSelectionModel::Deselect);
      }
  
      if (fReselect)
      {
          ui->peerWidget->selectRow(detailNodeRow);
      }
  
      if (stats)
          updateNodeDetail(stats);
  }
  
  void RPCConsole::updateNodeDetail(const CNodeCombinedStats *stats)
  {
      // Update cached nodeid
      cachedNodeid = stats->nodeStats.nodeid;
  
      // update the detail ui with latest node information
      QString peerAddrDetails(QString::fromStdString(stats->nodeStats.addrName));
      if (!stats->nodeStats.addrLocal.empty())
          peerAddrDetails += "<br />" + tr("via %1").arg(QString::fromStdString(stats->nodeStats.addrLocal));
      ui->peerHeading->setText(peerAddrDetails);
      ui->peerServices->setText(GUIUtil::formatServicesStr(stats->nodeStats.nServices));
      ui->peerLastSend->setText(stats->nodeStats.nLastSend ? GUIUtil::formatDurationStr(GetTime() - stats->nodeStats.nLastSend) : tr("never"));
      ui->peerLastRecv->setText(stats->nodeStats.nLastRecv ? GUIUtil::formatDurationStr(GetTime() - stats->nodeStats.nLastRecv) : tr("never"));
      ui->peerBytesSent->setText(FormatBytes(stats->nodeStats.nSendBytes));
      ui->peerBytesRecv->setText(FormatBytes(stats->nodeStats.nRecvBytes));
      ui->peerConnTime->setText(GUIUtil::formatDurationStr(GetTime() - stats->nodeStats.nTimeConnected));
      ui->peerPingTime->setText(GUIUtil::formatPingTime(stats->nodeStats.dPingTime));
      ui->timeoffset->setText(GUIUtil::formatTimeOffset(stats->nodeStats.nTimeOffset));
      ui->peerVersion->setText(QString("%1").arg(stats->nodeStats.nVersion));
      ui->peerSubversion->setText(QString::fromStdString(stats->nodeStats.strSubVer));
      ui->peerId->setText(QString("%1").arg(stats->nodeStats.nodeid));
      ui->peerDirection->setText(stats->nodeStats.fInbound ? tr("Inbound") : tr("Outbound"));
      ui->peerHeight->setText(QString("%1").arg(stats->nodeStats.nChainHeight));
  
      // This check fails for example if the lock was busy and
      // nodeStateStats couldn't be fetched.
      if (stats->fNodeStateStatsAvailable) {
          // Ban score is init to 0
          ui->peerBanScore->setText(QString("%1").arg(stats->nodeStateStats.nMisbehavior));
  
          // Sync height is init to -1
          if (stats->nodeStateStats.nSyncHeight > -1)
              ui->peerSyncHeight->setText(QString("%1").arg(stats->nodeStateStats.nSyncHeight));
          else
              ui->peerSyncHeight->setText(tr("Unknown"));
      } else {
          ui->peerBanScore->setText(tr("Fetching..."));
          ui->peerSyncHeight->setText(tr("Fetching..."));
      }
  
      ui->detailWidget->show();
  }
  
  void RPCConsole::resizeEvent(QResizeEvent *event)
  {
      QWidget::resizeEvent(event);
  }
  
  void RPCConsole::showEvent(QShowEvent *event)
  {
      QWidget::showEvent(event);
  
      if (!clientModel)
          return;
  
      // start PeerTableModel auto refresh
      clientModel->getPeerTableModel()->startAutoRefresh();
  }
  
  void RPCConsole::hideEvent(QHideEvent *event)
  {
      QWidget::hideEvent(event);
  
      if (!clientModel)
          return;
  
      // stop PeerTableModel auto refresh
      clientModel->getPeerTableModel()->stopAutoRefresh();
  }
  
  void RPCConsole::on_showCLOptionsButton_clicked()
  {
      GUIUtil::HelpMessageBox help;
      help.exec();
  }
  