Merge #15153: gui: Add Open Wallet menu

1951ea434 gui: Show indeterminate progress dialog while opening walllet (João Barbosa)
8847cdaaa gui: Add OpenWalletActivity (João Barbosa)
4c8982a88 interfaces: Avoid interface instance if wallet is null (João Barbosa)
be82dea23 gui: Add thread to run background activity in WalletController (João Barbosa)
6c49a55b4 gui: Add Open Wallet menu (João Barbosa)
32a8c6abf gui: Add openWallet and getWalletsAvailableToOpen to WalletController (João Barbosa)
ab288b4e5 interfaces: Add loadWallet to Node (João Barbosa)
17abc0fd5 wallet: Factor out LoadWallet (João Barbosa)

Pull request description:

  The *Open Wallet* menu has all the available wallets currently not loaded. The list of the available wallets comes from `listWalletDir`.

  In the future the menu can be replaced by a custom dialog.

  <img width="674" alt="screenshot 2019-01-12 at 12 17 02" src="https://user-images.githubusercontent.com/3534524/51073166-ac041480-1664-11e9-8302-be81702bc146.png">

Tree-SHA512: ebfd75eee0c8264863748899843afab67dadb7dff21313c11e3cb5b6108d954978dd1f1ae786bc07580c5a771ea4ab38d18c1643c9b9b3683ed53f0f6c582e38

12 files changed, 163 insertions, 16 deletions

diff --git a/src/dummywallet.cpp b/src/dummywallet.cpp
index 9211a7596b..8a76021a5b 100644
--- a/src/dummywallet.cpp
+++ b/src/dummywallet.cpp
@@ -8,6 +8,10 @@
 
 class CWallet;
 
+namespace interfaces {
+class Chain;
+}
+
 class DummyWalletInit : public WalletInitInterface {
 public:
 
@@ -43,6 +47,11 @@ std::vector<std::shared_ptr<CWallet>> GetWallets()
     throw std::logic_error("Wallet function called in non-wallet build.");
 }
 
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::string& warning)
+{
+    throw std::logic_error("Wallet function called in non-wallet build.");
+}
+
 namespace interfaces {
 
 class Wallet;
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index a2b89c3f90..96bde7e9f2 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -42,6 +42,7 @@ class CWallet;
 fs::path GetWalletDir();
 std::vector<fs::path> ListWalletDir();
 std::vector<std::shared_ptr<CWallet>> GetWallets();
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::string& warning);
 
 namespace interfaces {
 
@@ -252,6 +253,10 @@ public:
         }
         return wallets;
     }
+    std::unique_ptr<Wallet> loadWallet(const std::string& name, std::string& error, std::string& warning) override
+    {
+        return MakeWallet(LoadWallet(*m_interfaces.chain, name, error, warning));
+    }
     std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) override
     {
         return MakeHandler(::uiInterface.InitMessage_connect(fn));
diff --git a/src/interfaces/node.h b/src/interfaces/node.h
index 54c2d78338..76b93af234 100644
--- a/src/interfaces/node.h
+++ b/src/interfaces/node.h
@@ -192,6 +192,11 @@ public:
     //! Return interfaces for accessing wallets (if any).
     virtual std::vector<std::unique_ptr<Wallet>> getWallets() = 0;
 
+    //! Attempts to load a wallet from file or directory.
+    //! The loaded wallet is also notified to handlers previously registered
+    //! with handleLoadWallet.
+    virtual std::unique_ptr<Wallet> loadWallet(const std::string& name, std::string& error, std::string& warning) = 0;
+
     //! Register handler for init messages.
     using InitMessageFn = std::function<void(const std::string& message)>;
     virtual std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) = 0;
diff --git a/src/interfaces/wallet.cpp b/src/interfaces/wallet.cpp
index 03b47bd3b5..206227b101 100644
--- a/src/interfaces/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -525,7 +525,7 @@ public:
 
 } // namespace
 
-std::unique_ptr<Wallet> MakeWallet(const std::shared_ptr<CWallet>& wallet) { return MakeUnique<WalletImpl>(wallet); }
+std::unique_ptr<Wallet> MakeWallet(const std::shared_ptr<CWallet>& wallet) { return wallet ? MakeUnique<WalletImpl>(wallet) : nullptr; }
 
 std::unique_ptr<ChainClient> MakeWalletClient(Chain& chain, std::vector<std::string> wallet_filenames)
 {
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 85d79ee26c..d6c6fd6e98 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -456,7 +456,7 @@ int GuiMain(int argc, char* argv[])
     //   IMPORTANT if it is no longer a typedef use the normal variant above
     qRegisterMetaType< CAmount >("CAmount");
     qRegisterMetaType< std::function<void()> >("std::function<void()>");
-
+    qRegisterMetaType<QMessageBox::Icon>("QMessageBox::Icon");
     /// 2. Parse command-line options. We do this after qt in order to show an error if there are problems parsing these
     // Command-line options take precedence:
     node->setupServerArgs();
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index ba7e8c7daf..f7a4bad916 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -334,6 +334,10 @@ void BitcoinGUI::createActions()
     openAction = new QAction(platformStyle->TextColorIcon(":/icons/open"), tr("Open &URI..."), this);
     openAction->setStatusTip(tr("Open a bitcoin: URI or payment request"));
 
+    m_open_wallet_action = new QAction(tr("Open Wallet"), this);
+    m_open_wallet_action->setMenu(new QMenu(this));
+    m_open_wallet_action->setStatusTip(tr("Open a wallet"));
+
     showHelpMessageAction = new QAction(platformStyle->TextColorIcon(":/icons/info"), tr("&Command-line options"), this);
     showHelpMessageAction->setMenuRole(QAction::NoRole);
     showHelpMessageAction->setStatusTip(tr("Show the %1 help message to get a list with possible Bitcoin command-line options").arg(tr(PACKAGE_NAME)));
@@ -361,6 +365,37 @@ void BitcoinGUI::createActions()
         connect(usedSendingAddressesAction, &QAction::triggered, walletFrame, &WalletFrame::usedSendingAddresses);
         connect(usedReceivingAddressesAction, &QAction::triggered, walletFrame, &WalletFrame::usedReceivingAddresses);
         connect(openAction, &QAction::triggered, this, &BitcoinGUI::openClicked);
+        connect(m_open_wallet_action->menu(), &QMenu::aboutToShow, [this] {
+            m_open_wallet_action->menu()->clear();
+            for (std::string path : m_wallet_controller->getWalletsAvailableToOpen()) {
+                QString name = path.empty() ? QString("["+tr("default wallet")+"]") : QString::fromStdString(path);
+                QAction* action = m_open_wallet_action->menu()->addAction(name);
+                connect(action, &QAction::triggered, [this, name, path] {
+                    OpenWalletActivity* activity = m_wallet_controller->openWallet(path);
+
+                    QProgressDialog* dialog = new QProgressDialog(this);
+                    dialog->setLabelText(tr("Opening Wallet <b>%1</b>...").arg(name.toHtmlEscaped()));
+                    dialog->setRange(0, 0);
+                    dialog->setCancelButton(nullptr);
+                    dialog->setWindowModality(Qt::ApplicationModal);
+                    dialog->show();
+
+                    connect(activity, &OpenWalletActivity::message, this, [this] (QMessageBox::Icon icon, QString text) {
+                        QMessageBox box;
+                        box.setIcon(icon);
+                        box.setText(tr("Open Wallet Failed"));
+                        box.setInformativeText(text);
+                        box.setStandardButtons(QMessageBox::Ok);
+                        box.setDefaultButton(QMessageBox::Ok);
+                        connect(this, &QObject::destroyed, &box, &QDialog::accept);
+                        box.exec();
+                    });
+                    connect(activity, &OpenWalletActivity::opened, this, &BitcoinGUI::setCurrentWallet);
+                    connect(activity, &OpenWalletActivity::finished, activity, &QObject::deleteLater);
+                    connect(activity, &OpenWalletActivity::finished, dialog, &QObject::deleteLater);
+                });
+            }
+        });
     }
 #endif // ENABLE_WALLET
 
@@ -382,6 +417,8 @@ void BitcoinGUI::createMenuBar()
     QMenu *file = appMenuBar->addMenu(tr("&File"));
     if(walletFrame)
     {
+        file->addAction(m_open_wallet_action);
+        file->addSeparator();
         file->addAction(openAction);
         file->addAction(backupWalletAction);
         file->addAction(signMessageAction);
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index c31cefe603..c226494020 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -147,6 +147,7 @@ private:
     QAction* openRPCConsoleAction = nullptr;
     QAction* openAction = nullptr;
     QAction* showHelpMessageAction = nullptr;
+    QAction* m_open_wallet_action{nullptr};
     QAction* m_wallet_selector_label_action = nullptr;
     QAction* m_wallet_selector_action = nullptr;
 
diff --git a/src/qt/walletcontroller.cpp b/src/qt/walletcontroller.cpp
index df2b7a3f9b..3483c75970 100644
--- a/src/qt/walletcontroller.cpp
+++ b/src/qt/walletcontroller.cpp
@@ -9,6 +9,7 @@
 
 #include <algorithm>
 
+#include <QMessageBox>
 #include <QMutexLocker>
 #include <QThread>
 
@@ -25,11 +26,17 @@ WalletController::WalletController(interfaces::Node& node, const PlatformStyle*
     for (std::unique_ptr<interfaces::Wallet>& wallet : m_node.getWallets()) {
         getOrCreateWallet(std::move(wallet));
     }
+
+    m_activity_thread.start();
 }
 
 // Not using the default destructor because not all member types definitions are
 // available in the header, just forward declared.
-WalletController::~WalletController() {}
+WalletController::~WalletController()
+{
+    m_activity_thread.quit();
+    m_activity_thread.wait();
+}
 
 std::vector<WalletModel*> WalletController::getWallets() const
 {
@@ -37,6 +44,25 @@ std::vector<WalletModel*> WalletController::getWallets() const
     return m_wallets;
 }
 
+std::vector<std::string> WalletController::getWalletsAvailableToOpen() const
+{
+    QMutexLocker locker(&m_mutex);
+    std::vector<std::string> wallets = m_node.listWalletDir();
+    for (WalletModel* wallet_model : m_wallets) {
+        auto it = std::remove(wallets.begin(), wallets.end(), wallet_model->wallet().getWalletName());
+        if (it != wallets.end()) wallets.erase(it);
+    }
+    return wallets;
+}
+
+OpenWalletActivity* WalletController::openWallet(const std::string& name, QWidget* parent)
+{
+    OpenWalletActivity* activity = new OpenWalletActivity(this, name);
+    activity->moveToThread(&m_activity_thread);
+    QMetaObject::invokeMethod(activity, "open", Qt::QueuedConnection);
+    return activity;
+}
+
 WalletModel* WalletController::getOrCreateWallet(std::unique_ptr<interfaces::Wallet> wallet)
 {
     QMutexLocker locker(&m_mutex);
@@ -93,3 +119,24 @@ void WalletController::removeAndDeleteWallet(WalletModel* wallet_model)
     // CWallet shared pointer.
     delete wallet_model;
 }
+
+
+OpenWalletActivity::OpenWalletActivity(WalletController* wallet_controller, const std::string& name)
+    : m_wallet_controller(wallet_controller)
+    , m_name(name)
+{}
+
+void OpenWalletActivity::open()
+{
+    std::string error, warning;
+    std::unique_ptr<interfaces::Wallet> wallet = m_wallet_controller->m_node.loadWallet(m_name, error, warning);
+    if (!warning.empty()) {
+        Q_EMIT message(QMessageBox::Warning, QString::fromStdString(warning));
+    }
+    if (wallet) {
+        Q_EMIT opened(m_wallet_controller->getOrCreateWallet(std::move(wallet)));
+    } else {
+        Q_EMIT message(QMessageBox::Critical, QString::fromStdString(error));
+    }
+    Q_EMIT finished();
+}
diff --git a/src/qt/walletcontroller.h b/src/qt/walletcontroller.h
index 22b71b07ff..f19c0e1f3d 100644
--- a/src/qt/walletcontroller.h
+++ b/src/qt/walletcontroller.h
@@ -12,7 +12,9 @@
 #include <memory>
 #include <vector>
 
+#include <QMessageBox>
 #include <QMutex>
+#include <QThread>
 
 class OptionsModel;
 class PlatformStyle;
@@ -22,6 +24,8 @@ class Handler;
 class Node;
 } // namespace interfaces
 
+class OpenWalletActivity;
+
 /**
  * Controller between interfaces::Node, WalletModel instances and the GUI.
  */
@@ -37,6 +41,9 @@ public:
     ~WalletController();
 
     std::vector<WalletModel*> getWallets() const;
+    std::vector<std::string> getWalletsAvailableToOpen() const;
+
+    OpenWalletActivity* openWallet(const std::string& name, QWidget* parent = nullptr);
 
 private Q_SLOTS:
     void addWallet(WalletModel* wallet_model);
@@ -48,12 +55,35 @@ Q_SIGNALS:
     void coinsSent(WalletModel* wallet_model, SendCoinsRecipient recipient, QByteArray transaction);
 
 private:
+    QThread m_activity_thread;
     interfaces::Node& m_node;
     const PlatformStyle* const m_platform_style;
     OptionsModel* const m_options_model;
     mutable QMutex m_mutex;
     std::vector<WalletModel*> m_wallets;
     std::unique_ptr<interfaces::Handler> m_handler_load_wallet;
+
+    friend class OpenWalletActivity;
+};
+
+class OpenWalletActivity : public QObject
+{
+    Q_OBJECT
+
+public:
+    OpenWalletActivity(WalletController* wallet_controller, const std::string& name);
+
+public Q_SLOTS:
+    void open();
+
+Q_SIGNALS:
+    void message(QMessageBox::Icon icon, const QString text);
+    void finished();
+    void opened(WalletModel* wallet_model);
+
+private:
+    WalletController* const m_wallet_controller;
+    std::string const m_name;
 };
 
 #endif // BITCOIN_QT_WALLETCONTROLLER_H
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 9bbbdc6132..a9fbed5423 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -2555,7 +2555,6 @@ static UniValue loadwallet(const JSONRPCRequest& request)
             }.ToString());
 
     WalletLocation location(request.params[0].get_str());
-    std::string error;
 
     if (!location.Exists()) {
         throw JSONRPCError(RPC_WALLET_NOT_FOUND, "Wallet " + location.GetName() + " not found.");
@@ -2567,18 +2566,9 @@ static UniValue loadwallet(const JSONRPCRequest& request)
         }
     }
 
-    std::string warning;
-    if (!CWallet::Verify(*g_rpc_interfaces->chain, location, false, error, warning)) {
-        throw JSONRPCError(RPC_WALLET_ERROR, "Wallet file verification failed: " + error);
-    }
-
-    std::shared_ptr<CWallet> const wallet = CWallet::CreateWalletFromFile(*g_rpc_interfaces->chain, location);
-    if (!wallet) {
-        throw JSONRPCError(RPC_WALLET_ERROR, "Wallet loading failed.");
-    }
-    AddWallet(wallet);
-
-    wallet->postInitProcess();
+    std::string error, warning;
+    std::shared_ptr<CWallet> const wallet = LoadWallet(*g_rpc_interfaces->chain, location, error, warning);
+    if (!wallet) throw JSONRPCError(RPC_WALLET_ERROR, error);
 
     UniValue obj(UniValue::VOBJ);
     obj.pushKV("name", wallet->GetName());
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index d38c15220f..063015d1d8 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -130,6 +130,28 @@ void UnloadWallet(std::shared_ptr<CWallet>&& wallet)
     }
 }
 
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::string& warning)
+{
+    if (!CWallet::Verify(chain, location, false, error, warning)) {
+        error = "Wallet file verification failed: " + error;
+        return nullptr;
+    }
+
+    std::shared_ptr<CWallet> wallet = CWallet::CreateWalletFromFile(chain, location);
+    if (!wallet) {
+        error = "Wallet loading failed.";
+        return nullptr;
+    }
+    AddWallet(wallet);
+    wallet->postInitProcess();
+    return wallet;
+}
+
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::string& warning)
+{
+    return LoadWallet(chain, WalletLocation(name), error, warning);
+}
+
 const uint32_t BIP32_HARDENED_KEY_LIMIT = 0x80000000;
 
 const uint256 CMerkleTx::ABANDON_HASH(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index c455b7cdad..5846ac0f3e 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -66,6 +66,7 @@ bool RemoveWallet(const std::shared_ptr<CWallet>& wallet);
 bool HasWallets();
 std::vector<std::shared_ptr<CWallet>> GetWallets();
 std::shared_ptr<CWallet> GetWallet(const std::string& name);
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::string& warning);
 
 //! Default for -keypool
 static const unsigned int DEFAULT_KEYPOOL_SIZE = 1000;