ui: Support wallets unloaded dynamically

src/interfaces/wallet.cpp

@@ -429,6 +429,10 @@ public:
     bool hdEnabled() override { return m_wallet.IsHDEnabled(); }
     OutputType getDefaultAddressType() override { return m_wallet.m_default_address_type; }
     OutputType getDefaultChangeType() override { return m_wallet.m_default_change_type; }
+    std::unique_ptr<Handler> handleUnload(UnloadFn fn) override
+    {
+        return MakeHandler(m_wallet.NotifyUnload.connect(fn));
+    }
     std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) override
     {
         return MakeHandler(m_wallet.ShowProgress.connect(fn));

src/interfaces/wallet.h

@@ -242,6 +242,10 @@ public:
     // Get default change type.
     virtual OutputType getDefaultChangeType() = 0;
 
+    //! Register handler for unload message.
+    using UnloadFn = std::function<void()>;
+    virtual std::unique_ptr<Handler> handleUnload(UnloadFn fn) = 0;
+
     //! Register handler for show progress messages.
     using ShowProgressFn = std::function<void(const std::string& title, int progress)>;
     virtual std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) = 0;

src/qt/bitcoin.cpp

@@ -238,6 +238,7 @@ public Q_SLOTS:
     /// Handle runaway exceptions. Shows a message box with the problem and quits the program.
     void handleRunawayException(const QString &message);
     void addWallet(WalletModel* walletModel);
+    void removeWallet();
 
 Q_SIGNALS:
     void requestedInitialize();
@@ -467,11 +468,22 @@ void BitcoinApplication::addWallet(WalletModel* walletModel)
 
     connect(walletModel, SIGNAL(coinsSent(WalletModel*, SendCoinsRecipient, QByteArray)),
         paymentServer, SLOT(fetchPaymentACK(WalletModel*, const SendCoinsRecipient&, QByteArray)));
+    connect(walletModel, SIGNAL(unload()), this, SLOT(removeWallet()));
 
     m_wallet_models.push_back(walletModel);
 #endif
 }
 
+void BitcoinApplication::removeWallet()
+{
+#ifdef ENABLE_WALLET
+    WalletModel* walletModel = static_cast<WalletModel*>(sender());
+    m_wallet_models.erase(std::find(m_wallet_models.begin(), m_wallet_models.end(), walletModel));
+    window->removeWallet(walletModel);
+    walletModel->deleteLater();
+#endif
+}
+
 void BitcoinApplication::initializeResult(bool success)
 {
     qDebug() << __func__ << ": Initialization result: " << success;
@@ -491,8 +503,10 @@ void BitcoinApplication::initializeResult(bool success)
 
 #ifdef ENABLE_WALLET
         m_handler_load_wallet = m_node.handleLoadWallet([this](std::unique_ptr<interfaces::Wallet> wallet) {
-            QMetaObject::invokeMethod(this, "addWallet", Qt::QueuedConnection,
-                Q_ARG(WalletModel*, new WalletModel(std::move(wallet), m_node, platformStyle, optionsModel)));
+            WalletModel* wallet_model = new WalletModel(std::move(wallet), m_node, platformStyle, optionsModel, nullptr);
+            // Fix wallet model thread affinity.
+            wallet_model->moveToThread(thread());
+            QMetaObject::invokeMethod(this, "addWallet", Qt::QueuedConnection, Q_ARG(WalletModel*, wallet_model));
         });
 
         for (auto& wallet : m_node.getWallets()) {

src/qt/bitcoingui.cpp

@@ -120,6 +120,7 @@ BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformSty
     modalOverlay(0),
     prevBlocks(0),
     spinnerFrame(0),
+    m_wallet_selector_label(nullptr),
     platformStyle(_platformStyle)
 {
     QSettings settings;
@@ -477,6 +478,16 @@ void BitcoinGUI::createToolBars()
 
         m_wallet_selector = new QComboBox();
         connect(m_wallet_selector, SIGNAL(currentIndexChanged(int)), this, SLOT(setCurrentWalletBySelectorIndex(int)));
+
+        m_wallet_selector_label = new QLabel();
+        m_wallet_selector_label->setText(tr("Wallet:") + " ");
+        m_wallet_selector_label->setBuddy(m_wallet_selector);
+
+        m_wallet_selector_label_action = appToolBar->addWidget(m_wallet_selector_label);
+        m_wallet_selector_action = appToolBar->addWidget(m_wallet_selector);
+
+        m_wallet_selector_label_action->setVisible(false);
+        m_wallet_selector_action->setVisible(false);
 #endif
     }
 }
@@ -556,16 +567,29 @@ bool BitcoinGUI::addWallet(WalletModel *walletModel)
     setWalletActionsEnabled(true);
     m_wallet_selector->addItem(display_name, name);
     if (m_wallet_selector->count() == 2) {
-        m_wallet_selector_label = new QLabel();
-        m_wallet_selector_label->setText(tr("Wallet:") + " ");
-        m_wallet_selector_label->setBuddy(m_wallet_selector);
-        appToolBar->addWidget(m_wallet_selector_label);
-        appToolBar->addWidget(m_wallet_selector);
+        m_wallet_selector_label_action->setVisible(true);
+        m_wallet_selector_action->setVisible(true);
     }
     rpcConsole->addWallet(walletModel);
     return walletFrame->addWallet(walletModel);
 }
 
+bool BitcoinGUI::removeWallet(WalletModel* walletModel)
+{
+    if (!walletFrame) return false;
+    QString name = walletModel->getWalletName();
+    int index = m_wallet_selector->findData(name);
+    m_wallet_selector->removeItem(index);
+    if (m_wallet_selector->count() == 0) {
+        setWalletActionsEnabled(false);
+    } else if (m_wallet_selector->count() == 1) {
+        m_wallet_selector_label_action->setVisible(false);
+        m_wallet_selector_action->setVisible(false);
+    }
+    rpcConsole->removeWallet(walletModel);
+    return walletFrame->removeWallet(name);
+}
+
 bool BitcoinGUI::setCurrentWallet(const QString& name)
 {
     if(!walletFrame)

src/qt/bitcoingui.h

@@ -70,6 +70,7 @@ public:
         functionality.
     */
     bool addWallet(WalletModel *walletModel);
+    bool removeWallet(WalletModel* walletModel);
     void removeAllWallets();
 #endif // ENABLE_WALLET
     bool enableWallet;
@@ -122,8 +123,10 @@ private:
     QAction *openRPCConsoleAction;
     QAction *openAction;
     QAction *showHelpMessageAction;
+    QAction *m_wallet_selector_label_action = nullptr;
+    QAction *m_wallet_selector_action = nullptr;
 
-    QLabel *m_wallet_selector_label;
+    QLabel *m_wallet_selector_label = nullptr;
     QComboBox *m_wallet_selector;
 
     QSystemTrayIcon *trayIcon;

src/qt/rpcconsole.cpp

@@ -713,6 +713,16 @@ void RPCConsole::addWallet(WalletModel * const walletModel)
         ui->WalletSelectorLabel->setVisible(true);
     }
 }
+
+void RPCConsole::removeWallet(WalletModel * const walletModel)
+{
+    const QString name = walletModel->getWalletName();
+    ui->WalletSelector->removeItem(ui->WalletSelector->findData(name));
+    if (ui->WalletSelector->count() == 2) {
+        ui->WalletSelector->setVisible(false);
+        ui->WalletSelectorLabel->setVisible(false);
+    }
+}
 #endif
 
 static QString categoryClass(int category)

src/qt/rpcconsole.h

@@ -48,6 +48,7 @@ public:
 
     void setClientModel(ClientModel *model);
     void addWallet(WalletModel * const walletModel);
+    void removeWallet(WalletModel* const walletModel);
 
     enum MessageClass {
         MC_ERROR,

src/qt/walletmodel.cpp

@@ -364,6 +364,12 @@ bool WalletModel::changePassphrase(const SecureString &oldPass, const SecureStri
 }
 
 // Handlers for core signals
+static void NotifyUnload(WalletModel* walletModel)
+{
+    qDebug() << "NotifyUnload";
+    QMetaObject::invokeMethod(walletModel, "unload", Qt::QueuedConnection);
+}
+
 static void NotifyKeyStoreStatusChanged(WalletModel *walletmodel)
 {
     qDebug() << "NotifyKeyStoreStatusChanged";
@@ -411,6 +417,7 @@ static void NotifyWatchonlyChanged(WalletModel *walletmodel, bool fHaveWatchonly
 void WalletModel::subscribeToCoreSignals()
 {
     // Connect signals to wallet
+    m_handler_unload = m_wallet->handleUnload(boost::bind(&NotifyUnload, this));
     m_handler_status_changed = m_wallet->handleStatusChanged(boost::bind(&NotifyKeyStoreStatusChanged, this));
     m_handler_address_book_changed = m_wallet->handleAddressBookChanged(boost::bind(NotifyAddressBookChanged, this, _1, _2, _3, _4, _5));
     m_handler_transaction_changed = m_wallet->handleTransactionChanged(boost::bind(NotifyTransactionChanged, this, _1, _2));
@@ -421,6 +428,7 @@ void WalletModel::subscribeToCoreSignals()
 void WalletModel::unsubscribeFromCoreSignals()
 {
     // Disconnect signals from wallet
+    m_handler_unload->disconnect();
     m_handler_status_changed->disconnect();
     m_handler_address_book_changed->disconnect();
     m_handler_transaction_changed->disconnect();

src/qt/walletmodel.h

@@ -208,6 +208,7 @@ public:
     AddressTableModel* getAddressTableModel() const { return addressTableModel; }
 private:
     std::unique_ptr<interfaces::Wallet> m_wallet;
+    std::unique_ptr<interfaces::Handler> m_handler_unload;
     std::unique_ptr<interfaces::Handler> m_handler_status_changed;
     std::unique_ptr<interfaces::Handler> m_handler_address_book_changed;
     std::unique_ptr<interfaces::Handler> m_handler_transaction_changed;
@@ -261,6 +262,9 @@ Q_SIGNALS:
     // Watch-only address added
     void notifyWatchonlyChanged(bool fHaveWatchonly);
 
+    // Signal that wallet is about to be removed
+    void unload();
+
 public Q_SLOTS:
     /* Wallet status might have changed */
     void updateStatus();