Added command line option to rewind blockchain to height

In case wallet stuck syncing (e.g. on wrong chain). This will spare the need to manually delete blockchain files and sync from scratch.

src/CommandLineParser.cpp

@@ -27,6 +27,7 @@ CommandLineParser::CommandLineParser(QObject* _parent) : QObject(_parent), m_par
   m_seedNodeOption("seed-node", tr("Connect to a node to retrieve peer addresses, and disconnect"), tr("node")),
   m_hideMyPortOption("hide-my-port", tr("Do not announce yourself as peerlist candidate")),
   m_dataDirOption("data-dir", tr("Specify data directory"), tr("directory"), QString::fromLocal8Bit(Tools::getDefaultDataDirectory().c_str())),
+  m_rollBackOption("rollback", tr("Rollback to height"), tr("height"), QString::number(std::numeric_limits<uint32_t>::max())),
   m_minimized("minimized", tr("Run application in minimized mode")) {
   m_parser.setApplicationDescription(tr("Qwertycoin wallet"));
   m_parser.addHelpOption();
@@ -42,6 +43,7 @@ CommandLineParser::CommandLineParser(QObject* _parent) : QObject(_parent), m_par
   m_parser.addOption(m_seedNodeOption);
   m_parser.addOption(m_hideMyPortOption);
   m_parser.addOption(m_dataDirOption);
+  m_parser.addOption(m_rollBackOption);
   m_parser.addOption(m_minimized);
 }
 
@@ -121,4 +123,8 @@ QString CommandLineParser::getDataDir() const {
   return m_parser.value(m_dataDirOption);
 }
 
+quint32 CommandLineParser::rollBack() const {
+  return m_parser.value(m_rollBackOption).toULong();
+}
+
 }

src/CommandLineParser.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <limits>
 #include <QCommandLineParser>
 #include <QObject>
 
@@ -34,6 +35,7 @@ class CommandLineParser : public QObject {
   QStringList getExclusiveNodes() const;
   QStringList getSeedNodes() const;
   QString getDataDir() const;
+  quint32 rollBack() const;
 
 private:
   QCommandLineParser m_parser;
@@ -50,6 +52,7 @@ class CommandLineParser : public QObject {
   QCommandLineOption m_seedNodeOption;
   QCommandLineOption m_hideMyPortOption;
   QCommandLineOption m_dataDirOption;
+  QCommandLineOption m_rollBackOption;
   QCommandLineOption m_minimized;
 };
 

src/CryptoNoteWrapper.cpp

@@ -3,6 +3,7 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <limits>
 #include "CryptoNoteWrapper.h"
 #include "config/Checkpoints.h"
 #include "CryptoNoteCore/CryptoNoteBasicImpl.h"
@@ -473,6 +474,10 @@ class InprocessNode : CryptoNote::INodeObserver, public Node {
         return;
       }
 
+      if(Settings::instance().getRollBack() != std::numeric_limits<uint32_t>::max()) {
+        m_core.rollbackBlockchain(Settings::instance().getRollBack());
+      }
+
       if (!m_nodeServer.init(m_netNodeConfig)) {
         callback(make_error_code(CryptoNote::error::NOT_INITIALIZED));
         return;

src/Settings.cpp

@@ -181,6 +181,11 @@ QDir Settings::getDataDir() const {
   return QDir(m_cmdLineParser->getDataDir());
 }
 
+quint32 Settings::getRollBack() const {
+  Q_CHECK_PTR(m_cmdLineParser);
+  return m_cmdLineParser->rollBack();
+}
+
 QString Settings::getWalletFile() const {
   return m_settings.contains("walletFile") ? m_settings.value("walletFile").toString() :
     getDataDir().absoluteFilePath(QCoreApplication::applicationName() + ".wallet");

src/Settings.h

@@ -57,6 +57,8 @@ class Settings : public QObject {
   quint64 getOptimizationThreshold() const;
   quint64 getOptimizationMixin() const;
 
+  quint32 getRollBack() const;
+
   bool isEncrypted() const;
   bool isStartOnLoginEnabled() const;
   bool isTrackingMode() const;