Configurable Automatic Wallet Backup

src/init.cpp

@@ -48,6 +48,7 @@ using namespace boost;
 #ifdef ENABLE_WALLET
 std::string strWalletFile;
 CWallet* pwalletMain;
+int nWalletBackups = 10;
 #endif
 
 #ifdef WIN32
@@ -273,21 +274,22 @@ std::string HelpMessage(HelpMessageMode hmm)
 
 #ifdef ENABLE_WALLET
     strUsage += "\n" + _("Wallet options:") + "\n";
-    strUsage += "  -disablewallet         " + _("Do not load the wallet and disable wallet RPC calls") + "\n";
-    strUsage += "  -keepass               " + _("Use KeePass 2 integration using KeePassHttp plugin (default: 0)") + "\n";
-    strUsage += "  -keepassport=<port>    " + _("Connect to KeePassHttp on port <port> (default: 19455)") + "\n";
-    strUsage += "  -keepasskey=<key>      " + _("KeePassHttp key for AES encrypted communication with KeePass") + "\n";
-    strUsage += "  -keepassid=<name>      " + _("KeePassHttp id for the established association") + "\n";
-    strUsage += "  -keepassname=<name>    " + _("Name to construct url for KeePass entry that stores the wallet passphrase") + "\n";
-    strUsage += "  -keypool=<n>           " + _("Set key pool size to <n> (default: 1000)") + "\n";
-    strUsage += "  -paytxfee=<amt>        " + _("Fee per kB to add to transactions you send") + "\n";
-    strUsage += "  -rescan                " + _("Rescan the block chain for missing wallet transactions") + " " + _("on startup") + "\n";
-    strUsage += "  -salvagewallet         " + _("Attempt to recover private keys from a corrupt wallet.dat") + " " + _("on startup") + "\n";
-    strUsage += "  -spendzeroconfchange   " + _("Spend unconfirmed change when sending transactions (default: 1)") + "\n";
-    strUsage += "  -upgradewallet         " + _("Upgrade wallet to latest format") + " " + _("on startup") + "\n";
-    strUsage += "  -wallet=<file>         " + _("Specify wallet file (within data directory)") + " " + _("(default: wallet.dat)") + "\n";
-    strUsage += "  -walletnotify=<cmd>    " + _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)") + "\n";
-    strUsage += "  -zapwallettxes         " + _("Clear list of wallet transactions (diagnostic tool; implies -rescan)") + "\n";
+    strUsage += "  -createwalletbackups=<n> " + _("Number of automatic wallet backups (default: 10)") + "\n";
+    strUsage += "  -disablewallet           " + _("Do not load the wallet and disable wallet RPC calls") + "\n";
+    strUsage += "  -keepass                 " + _("Use KeePass 2 integration using KeePassHttp plugin (default: 0)") + "\n";
+    strUsage += "  -keepassport=<port>      " + _("Connect to KeePassHttp on port <port> (default: 19455)") + "\n";
+    strUsage += "  -keepasskey=<key>        " + _("KeePassHttp key for AES encrypted communication with KeePass") + "\n";
+    strUsage += "  -keepassid=<name>        " + _("KeePassHttp id for the established association") + "\n";
+    strUsage += "  -keepassname=<name>      " + _("Name to construct url for KeePass entry that stores the wallet passphrase") + "\n";
+    strUsage += "  -keypool=<n>             " + _("Set key pool size to <n> (default: 1000)") + "\n";
+    strUsage += "  -paytxfee=<amt>          " + _("Fee per kB to add to transactions you send") + "\n";
+    strUsage += "  -rescan                  " + _("Rescan the block chain for missing wallet transactions") + " " + _("on startup") + "\n";
+    strUsage += "  -salvagewallet           " + _("Attempt to recover private keys from a corrupt wallet.dat") + " " + _("on startup") + "\n";
+    strUsage += "  -spendzeroconfchange     " + _("Spend unconfirmed change when sending transactions (default: 1)") + "\n";
+    strUsage += "  -upgradewallet           " + _("Upgrade wallet to latest format") + " " + _("on startup") + "\n";
+    strUsage += "  -wallet=<file>           " + _("Specify wallet file (within data directory)") + " " + _("(default: wallet.dat)") + "\n";
+    strUsage += "  -walletnotify=<cmd>      " + _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)") + "\n";
+    strUsage += "  -zapwallettxes           " + _("Clear list of wallet transactions (diagnostic tool; implies -rescan)") + "\n";
 #endif
 
     strUsage += "\n" + _("Debugging/Testing options:") + "\n";
@@ -711,9 +713,69 @@ bool AppInit2(boost::thread_group& threadGroup)
 
     int64_t nStart;
 
-    // ********************************************************* Step 5: verify wallet database integrity
+    // ********************************************************* Step 5: Backup wallet and verify wallet database integrity
 #ifdef ENABLE_WALLET
     if (!fDisableWallet) {
+
+        filesystem::path backupDir = GetDataDir() / "backups";
+        if (!filesystem::exists(backupDir))
+        {
+            // Always create backup folder to not confuse the operating system's file browser
+            filesystem::create_directories(backupDir);
+        }
+        nWalletBackups = GetArg("-createwalletbackups", 10);
+        nWalletBackups = std::max(0, std::min(10, nWalletBackups));
+        if(nWalletBackups > 0)
+        {
+            if (filesystem::exists(backupDir))
+            {
+                // Create backup of the wallet
+                std::string dateTimeStr = DateTimeStrFormat(".%Y-%m-%d-%H.%M", GetTime());
+                std::string backupPathStr = backupDir.string();
+                backupPathStr += "/" + strWalletFile;
+                std::string sourcePathStr = GetDataDir().string();
+                sourcePathStr += "/" + strWalletFile;
+                boost::filesystem::path sourceFile = sourcePathStr;
+                boost::filesystem::path backupFile = backupPathStr + dateTimeStr;
+                sourceFile.make_preferred();
+                backupFile.make_preferred();
+                try {
+                    boost::filesystem::copy_file(sourceFile, backupFile);
+                    LogPrintf("Creating backup of %s -> %s\n", sourceFile, backupFile);
+                } catch(boost::filesystem::filesystem_error &error) {
+                    LogPrintf("Failed to create backup %s\n", error.what());
+                }
+                // Keep only the last 10 backups, including the new one of course
+                typedef std::multimap<std::time_t, boost::filesystem::path> folder_set_t;
+                folder_set_t folder_set;
+                boost::filesystem::directory_iterator end_iter;
+                boost::filesystem::path backupFolder = backupDir.string();
+                backupFolder.make_preferred();
+                // Build map of backup files sorted by last write time
+                for (boost::filesystem::directory_iterator dir_iter(backupFolder); dir_iter != end_iter; ++dir_iter)
+                {
+                    if ( boost::filesystem::is_regular_file(dir_iter->status()))
+                        folder_set.insert(folder_set_t::value_type(boost::filesystem::last_write_time(dir_iter->path()), *dir_iter));
+                }
+                // Loop backward through backup files and keep the 10 newest ones
+                int counter = 0;
+                BOOST_REVERSE_FOREACH(PAIRTYPE(const std::time_t, boost::filesystem::path) file, folder_set)
+                {
+                    counter++;
+                    if (counter > nWalletBackups)
+                    {
+                        // More than nWalletBackups backups: delete oldest one(s)
+                        try {
+                            boost::filesystem::remove(file.second);
+                            LogPrintf("Old backup deleted: %s\n", file.second);
+                        } catch(boost::filesystem::filesystem_error &error) {
+                            LogPrintf("Failed to delete backup %s\n", error.what());
+                        }
+                    }
+                }
+            }
+        }
+
         LogPrintf("Using wallet %s\n", strWalletFile);
         uiInterface.InitMessage(_("Verifying wallet..."));
 

src/qt/Makefile.am

@@ -222,7 +222,8 @@ RES_ICONS = \
   res/icons/drkblue_editpaste.png \
   res/icons/drkblue_address-book.png \
   res/icons/drkblue_editcopy.png \
-  res/icons/drkblue_remove.png
+  res/icons/drkblue_remove.png \
+  res/icons/browse.png
 
 
 BITCOIN_QT_CPP = \

src/qt/bitcoingui.cpp

@@ -193,6 +193,7 @@ BitcoinGUI::BitcoinGUI(bool fIsTestnet, QWidget *parent) :
     connect(openRPCConsoleAction, SIGNAL(triggered()), rpcConsole, SLOT(showConsole()));
     connect(openNetworkAction, SIGNAL(triggered()), rpcConsole, SLOT(showNetwork()));
     connect(openConfEditorAction, SIGNAL(triggered()), rpcConsole, SLOT(showConfEditor()));
+    connect(showBackupsAction, SIGNAL(triggered()), rpcConsole, SLOT(showBackups()));
 
 
     // prevents an oben debug window from becoming stuck/unusable on client shutdown
@@ -330,6 +331,8 @@ void BitcoinGUI::createActions(bool fIsTestnet)
     openNetworkAction->setStatusTip(tr("Show network monitor"));
 	openConfEditorAction = new QAction(QIcon(":/icons/edit"), tr("Open &Configuration File"), this);
     openConfEditorAction->setStatusTip(tr("Open configuration file"));
+    showBackupsAction = new QAction(QIcon(":/icons/browse"), tr("Show Automatic &Backups"), this);
+    showBackupsAction->setStatusTip(tr("Show automatically created wallet backups"));
 
     usedSendingAddressesAction = new QAction(QIcon(":/icons/address-book"), tr("&Sending addresses..."), this);
     usedSendingAddressesAction->setStatusTip(tr("Show the list of used sending addresses and labels"));
@@ -408,6 +411,7 @@ void BitcoinGUI::createMenuBar()
         tools->addAction(openRPCConsoleAction);
         tools->addAction(openNetworkAction);
         tools->addAction(openConfEditorAction);
+        tools->addAction(showBackupsAction);
     }
 
     QMenu *help = appMenuBar->addMenu(tr("&Help"));
@@ -570,6 +574,7 @@ void BitcoinGUI::createTrayIconMenu()
     trayIconMenu->addAction(openRPCConsoleAction);
     trayIconMenu->addAction(openNetworkAction);
     trayIconMenu->addAction(openConfEditorAction);
+    trayIconMenu->addAction(showBackupsAction);
 #ifndef Q_OS_MAC // This is built-in on Mac
     trayIconMenu->addSeparator();
     trayIconMenu->addAction(quitAction);

src/qt/bitcoingui.h

@@ -97,6 +97,7 @@ class BitcoinGUI : public QMainWindow
     QAction *openRPCConsoleAction;
     QAction *openNetworkAction;
     QAction *openConfEditorAction;
+    QAction *showBackupsAction;
     QAction *openAction;
     QAction *showHelpMessageAction;
 

src/qt/dash.qrc

@@ -45,6 +45,7 @@
         <file alias="drkblue_address-book">res/icons/drkblue_address-book.png</file>
         <file alias="drkblue_editcopy">res/icons/drkblue_editcopy.png</file>
         <file alias="drkblue_remove">res/icons/drkblue_remove.png</file>
+        <file alias="browse">res/icons/browse.png</file>
     </qresource>
     <qresource prefix="/css">
         <file alias="drkblue">res/css/drkblue.css</file>

src/qt/guiutil.cpp

@@ -384,6 +384,15 @@ void openConfigfile()
         QDesktopServices::openUrl(QUrl::fromLocalFile(boostPathToQString(pathConfig)));
 }
 
+void showBackups()
+{
+    boost::filesystem::path pathBackups = GetDataDir() / "backups";
+
+    /* Open folder with default browser */
+    if (boost::filesystem::exists(pathBackups))
+        QDesktopServices::openUrl(QUrl::fromLocalFile(boostPathToQString(pathBackups)));
+}
+
 ToolTipToRichTextFilter::ToolTipToRichTextFilter(int size_threshold, QObject *parent) :
     QObject(parent), size_threshold(size_threshold)
 {

src/qt/guiutil.h

@@ -106,6 +106,9 @@ namespace GUIUtil
 
     // Open dash.conf
     void openConfigfile();	
+
+    // Browse backup folder
+    void showBackups();
 
     /** Qt event filter that intercepts ToolTipChange events, and replaces the tooltip with a rich text
       representation if needed. This assures that Qt can word-wrap long tooltip messages.

src/qt/rpcconsole.cpp

@@ -524,3 +524,8 @@ void RPCConsole::showConfEditor()
 {
     GUIUtil::openConfigfile();
 }
+
+void RPCConsole::showBackups()
+{
+    GUIUtil::showBackups();
+}

src/qt/rpcconsole.h

@@ -67,6 +67,8 @@ public slots:
     void showNetwork();
     /** Open external (default) editor with dash.conf */
     void showConfEditor();	
+    /** Show folder with wallet backups in default browser */
+    void showBackups();
 
 signals:
     // For RPC command executor