Merge #18278: interfaces: Describe and follow some code conventions

3dc27a1524 doc: Add internal interface conventions to developer notes (Russell Yanofsky)
1dca9dc4c7 refactor: Change createWallet, fillPSBT argument order (Russell Yanofsky)
96dfe5ced6 refactor: Change Chain::broadcastTransaction param order (Russell Yanofsky)
6ceb21909c refactor: Rename Chain::Notifications methods to be consistent with other interfaces methods (Russell Yanofsky)
1c2ab1a6d2 refactor: Rename Node::disconnect methods (Russell Yanofsky)
77e4b06572 refactor: Get rid of Wallet::IsWalletFlagSet method (Russell Yanofsky)

Pull request description:

  This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10).

  This PR doesn't change behavior at all, it just cleans up code in [`src/interfaces`](https://github.com/bitcoin/bitcoin/tree/master/src/interfaces) to simplify #10102, and [documents](https://github.com/ryanofsky/bitcoin/blob/pr/ipc-conv/doc/developer-notes.md#internal-interface-guidelines) coding conventions there better

ACKs for top commit:
  hebasto:
    re-ACK 3dc27a1524, the only change since the [previous](https://github.com/bitcoin/bitcoin/pull/18278#pullrequestreview-372582146) review is rebasing.
  MarcoFalke:
    ACK 3dc27a1524 🕍

Tree-SHA512: 62e6a0f2488e3924e559d2074ed460b92e7a0a5d98eab492221cb20d59d04bbe32aef2a8aeba5e4ea9168cfa91acd5bc973dce6677be0180bd7a919354df53ed

doc/developer-notes.md

@@ -43,6 +43,7 @@ Developer Notes
         - [Suggestions and examples](#suggestions-and-examples)
     - [Release notes](#release-notes)
     - [RPC interface guidelines](#rpc-interface-guidelines)
+    - [Internal interface guidelines](#internal-interface-guidelines)
 
 <!-- markdown-toc end -->
 
@@ -1100,3 +1101,124 @@ A few guidelines for introducing and reviewing new RPC interfaces:
   timestamps in the documentation.
 
   - *Rationale*: User-facing consistency.
+
+Internal interface guidelines
+-----------------------------
+
+Internal interfaces between parts of the codebase that are meant to be
+independent (node, wallet, GUI), are defined in
+[`src/interfaces/`](../src/interfaces/). The main interface classes defined
+there are [`interfaces::Chain`](../src/interfaces/chain.h), used by wallet to
+access the node's latest chain state,
+[`interfaces::Node`](../src/interfaces/node.h), used by the GUI to control the
+node, and [`interfaces::Wallet`](../src/interfaces/wallet.h), used by the GUI
+to control an individual wallet. There are also more specialized interface
+types like [`interfaces::Handler`](../src/interfaces/handler.h)
+[`interfaces::ChainClient`](../src/interfaces/chain.h) passed to and from
+various interface methods.
+
+Interface classes are written in a particular style so node, wallet, and GUI
+code doesn't need to run in the same process, and so the class declarations
+work more easily with tools and libraries supporting interprocess
+communication:
+
+- Interface classes should be abstract and have methods that are [pure
+  virtual](https://en.cppreference.com/w/cpp/language/abstract_class). This
+  allows multiple implementations to inherit from the same interface class,
+  particularly so one implementation can execute functionality in the local
+  process, and other implementations can forward calls to remote processes.
+
+- Interface method definitions should wrap existing functionality instead of
+  implementing new functionality. Any substantial new node or wallet
+  functionality should be implemented in [`src/node/`](../src/node/) or
+  [`src/wallet/`](../src/wallet/) and just exposed in
+  [`src/interfaces/`](../src/interfaces/) instead of being implemented there,
+  so it can be more modular and accessible to unit tests.
+
+- Interface method parameter and return types should either be serializable or
+  be other interface classes. Interface methods shouldn't pass references to
+  objects that can't be serialized or accessed from another process.
+
+  Examples:
+
+  ```c++
+  // Good: takes string argument and returns interface class pointer
+  virtual unique_ptr<interfaces::Wallet> loadWallet(std::string filename) = 0;
+
+  // Bad: returns CWallet reference that can't be used from another process
+  virtual CWallet& loadWallet(std::string filename) = 0;
+  ```
+
+  ```c++
+  // Good: accepts and returns primitive types
+  virtual bool findBlock(const uint256& hash, int& out_height, int64_t& out_time) = 0;
+
+  // Bad: returns pointer to internal node in a linked list inaccessible to
+  // other processes
+  virtual const CBlockIndex* findBlock(const uint256& hash) = 0;
+  ```
+
+  ```c++
+  // Good: takes plain callback type and returns interface pointer
+  using TipChangedFn = std::function<void(int block_height, int64_t block_time)>;
+  virtual std::unique_ptr<interfaces::Handler> handleTipChanged(TipChangedFn fn) = 0;
+
+  // Bad: returns boost connection specific to local process
+  using TipChangedFn = std::function<void(int block_height, int64_t block_time)>;
+  virtual boost::signals2::scoped_connection connectTipChanged(TipChangedFn fn) = 0;
+  ```
+
+- For consistency and friendliness to code generation tools, interface method
+  input and inout parameters should be ordered first and output parameters
+  should come last.
+
+  Example:
+
+  ```c++
+  // Good: error output param is last
+  virtual bool broadcastTransaction(const CTransactionRef& tx, CAmount max_fee, std::string& error) = 0;
+
+  // Bad: error output param is between input params
+  virtual bool broadcastTransaction(const CTransactionRef& tx, std::string& error, CAmount max_fee) = 0;
+  ```
+
+- For friendliness to code generation tools, interface methods should not be
+  overloaded:
+
+  Example:
+
+  ```c++
+  // Good: method names are unique
+  virtual bool disconnectByAddress(const CNetAddr& net_addr) = 0;
+  virtual bool disconnectById(NodeId id) = 0;
+
+  // Bad: methods are overloaded by type
+  virtual bool disconnect(const CNetAddr& net_addr) = 0;
+  virtual bool disconnect(NodeId id) = 0;
+  ```
+
+- For consistency and friendliness to code generation tools, interface method
+  names should be `lowerCamelCase` and standalone function names should be
+  `UpperCamelCase`.
+
+  Examples:
+
+  ```c++
+  // Good: lowerCamelCase method name
+  virtual void blockConnected(const CBlock& block, int height) = 0;
+
+  // Bad: uppercase class method
+  virtual void BlockConnected(const CBlock& block, int height) = 0;
+  ```
+
+  ```c++
+  // Good: UpperCamelCase standalone function name
+  std::unique_ptr<Node> MakeNode(LocalInit& init);
+
+  // Bad: lowercase standalone function
+  std::unique_ptr<Node> makeNode(LocalInit& init);
+  ```
+
+  Note: This last convention isn't generally followed outside of
+  [`src/interfaces/`](../src/interfaces/), though it did come up for discussion
+  before in [#14635](https://github.com/bitcoin/bitcoin/pull/14635).

src/interfaces/chain.cpp

@@ -166,25 +166,25 @@ public:
     }
     void TransactionAddedToMempool(const CTransactionRef& tx) override
     {
-        m_notifications->TransactionAddedToMempool(tx);
+        m_notifications->transactionAddedToMempool(tx);
     }
     void TransactionRemovedFromMempool(const CTransactionRef& tx) override
     {
-        m_notifications->TransactionRemovedFromMempool(tx);
+        m_notifications->transactionRemovedFromMempool(tx);
     }
     void BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* index) override
     {
-        m_notifications->BlockConnected(*block, index->nHeight);
+        m_notifications->blockConnected(*block, index->nHeight);
     }
     void BlockDisconnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* index) override
     {
-        m_notifications->BlockDisconnected(*block, index->nHeight);
+        m_notifications->blockDisconnected(*block, index->nHeight);
     }
     void UpdatedBlockTip(const CBlockIndex* index, const CBlockIndex* fork_index, bool is_ibd) override
     {
-        m_notifications->UpdatedBlockTip();
+        m_notifications->updatedBlockTip();
     }
-    void ChainStateFlushed(const CBlockLocator& locator) override { m_notifications->ChainStateFlushed(locator); }
+    void ChainStateFlushed(const CBlockLocator& locator) override { m_notifications->chainStateFlushed(locator); }
     Chain& m_chain;
     Chain::Notifications* m_notifications;
 };
@@ -278,7 +278,10 @@ public:
         auto it = ::mempool.GetIter(txid);
         return it && (*it)->GetCountWithDescendants() > 1;
     }
-    bool broadcastTransaction(const CTransactionRef& tx, std::string& err_string, const CAmount& max_tx_fee, bool relay) override
+    bool broadcastTransaction(const CTransactionRef& tx,
+        const CAmount& max_tx_fee,
+        bool relay,
+        std::string& err_string) override
     {
         const TransactionError err = BroadcastTransaction(m_node, tx, err_string, max_tx_fee, relay, /*wait_callback*/ false);
         // Chain clients only care about failures to accept the tx to the mempool. Disregard non-mempool related failures.
@@ -366,7 +369,7 @@ public:
     {
         LOCK2(::cs_main, ::mempool.cs);
         for (const CTxMemPoolEntry& entry : ::mempool.mapTx) {
-            notifications.TransactionAddedToMempool(entry.GetSharedTx());
+            notifications.transactionAddedToMempool(entry.GetSharedTx());
         }
     }
     NodeContext& m_node;

src/interfaces/chain.h

@@ -154,7 +154,10 @@ public:
     //! Transaction is added to memory pool, if the transaction fee is below the
     //! amount specified by max_tx_fee, and broadcast to all peers if relay is set to true.
     //! Return false if the transaction could not be added due to the fee or for another reason.
-    virtual bool broadcastTransaction(const CTransactionRef& tx, std::string& err_string, const CAmount& max_tx_fee, bool relay) = 0;
+    virtual bool broadcastTransaction(const CTransactionRef& tx,
+        const CAmount& max_tx_fee,
+        bool relay,
+        std::string& err_string) = 0;
 
     //! Calculate mempool ancestor and descendant counts for the given transaction.
     virtual void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) = 0;
@@ -217,12 +220,12 @@ public:
     {
     public:
         virtual ~Notifications() {}
-        virtual void TransactionAddedToMempool(const CTransactionRef& tx) {}
+        virtual void transactionAddedToMempool(const CTransactionRef& tx) {}
-        virtual void TransactionRemovedFromMempool(const CTransactionRef& ptx) {}
+        virtual void transactionRemovedFromMempool(const CTransactionRef& ptx) {}
-        virtual void BlockConnected(const CBlock& block, int height) {}
+        virtual void blockConnected(const CBlock& block, int height) {}
-        virtual void BlockDisconnected(const CBlock& block, int height) {}
+        virtual void blockDisconnected(const CBlock& block, int height) {}
-        virtual void UpdatedBlockTip() {}
+        virtual void updatedBlockTip() {}
-        virtual void ChainStateFlushed(const CBlockLocator& locator) {}
+        virtual void chainStateFlushed(const CBlockLocator& locator) {}
     };
 
     //! Register handler for notifications.
@@ -245,7 +248,7 @@ public:
     //! Current RPC serialization flags.
     virtual int rpcSerializationFlags() = 0;
 
-    //! Synchronously send TransactionAddedToMempool notifications about all
+    //! Synchronously send transactionAddedToMempool notifications about all
     //! current mempool transactions to the specified handler and return after
     //! the last one is sent. These notifications aren't coordinated with async
     //! notifications sent by handleNotifications, so out of date async

src/interfaces/node.cpp

@@ -152,14 +152,14 @@ public:
         }
         return false;
     }
-    bool disconnect(const CNetAddr& net_addr) override
+    bool disconnectByAddress(const CNetAddr& net_addr) override
     {
         if (m_context.connman) {
             return m_context.connman->DisconnectNode(net_addr);
         }
         return false;
     }
-    bool disconnect(NodeId id) override
+    bool disconnectById(NodeId id) override
     {
         if (m_context.connman) {
             return m_context.connman->DisconnectNode(id);
@@ -262,12 +262,11 @@ public:
     {
         return MakeWallet(LoadWallet(*m_context.chain, name, error, warnings));
     }
-    WalletCreationStatus createWallet(const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::vector<std::string>& warnings, std::unique_ptr<Wallet>& result) override
+    std::unique_ptr<Wallet> createWallet(const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::vector<std::string>& warnings, WalletCreationStatus& status) override
     {
         std::shared_ptr<CWallet> wallet;
-        WalletCreationStatus status = CreateWallet(*m_context.chain, passphrase, wallet_creation_flags, name, error, warnings, wallet);
+        status = CreateWallet(*m_context.chain, passphrase, wallet_creation_flags, name, error, warnings, wallet);
-        result = MakeWallet(wallet);
+        return MakeWallet(wallet);
-        return status;
     }
     std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) override
     {

src/interfaces/node.h

@@ -124,10 +124,10 @@ public:
     virtual bool unban(const CSubNet& ip) = 0;
 
     //! Disconnect node by address.
-    virtual bool disconnect(const CNetAddr& net_addr) = 0;
+    virtual bool disconnectByAddress(const CNetAddr& net_addr) = 0;
 
     //! Disconnect node by id.
-    virtual bool disconnect(NodeId id) = 0;
+    virtual bool disconnectById(NodeId id) = 0;
 
     //! Get total bytes recv.
     virtual int64_t getTotalBytesRecv() = 0;
@@ -204,7 +204,7 @@ public:
     virtual std::unique_ptr<Wallet> loadWallet(const std::string& name, std::string& error, std::vector<std::string>& warnings) = 0;
 
     //! Create a wallet from file
-    virtual WalletCreationStatus createWallet(const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::vector<std::string>& warnings, std::unique_ptr<Wallet>& result) = 0;
+    virtual std::unique_ptr<Wallet> createWallet(const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::vector<std::string>& warnings, WalletCreationStatus& status) = 0;
 
     //! Register handler for init messages.
     using InitMessageFn = std::function<void(const std::string& message)>;

src/interfaces/wallet.cpp

@@ -352,11 +352,11 @@ public:
         }
         return {};
     }
-    TransactionError fillPSBT(PartiallySignedTransaction& psbtx,
+    TransactionError fillPSBT(int sighash_type,
-        bool& complete,
+        bool sign,
-        int sighash_type = 1 /* SIGHASH_ALL */,
+        bool bip32derivs,
-        bool sign = true,
+        PartiallySignedTransaction& psbtx,
-        bool bip32derivs = false) const override
+        bool& complete) override
     {
         return m_wallet->FillPSBT(psbtx, complete, sighash_type, sign, bip32derivs);
     }
@@ -463,8 +463,8 @@ public:
     }
     unsigned int getConfirmTarget() override { return m_wallet->m_confirm_target; }
     bool hdEnabled() override { return m_wallet->IsHDEnabled(); }
-    bool canGetAddresses() const override { return m_wallet->CanGetAddresses(); }
+    bool canGetAddresses() override { return m_wallet->CanGetAddresses(); }
-    bool IsWalletFlagSet(uint64_t flag) override { return m_wallet->IsWalletFlagSet(flag); }
+    bool privateKeysDisabled() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS); }
     OutputType getDefaultAddressType() override { return m_wallet->m_default_address_type; }
     OutputType getDefaultChangeType() override { return m_wallet->m_default_change_type; }
     CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }

src/interfaces/wallet.h

@@ -193,11 +193,11 @@ public:
         int& num_blocks) = 0;
 
     //! Fill PSBT.
-    virtual TransactionError fillPSBT(PartiallySignedTransaction& psbtx,
+    virtual TransactionError fillPSBT(int sighash_type,
-        bool& complete,
+        bool sign,
-        int sighash_type = 1 /* SIGHASH_ALL */,
+        bool bip32derivs,
-        bool sign = true,
+        PartiallySignedTransaction& psbtx,
-        bool bip32derivs = false) const = 0;
+        bool& complete) = 0;
 
     //! Get balances.
     virtual WalletBalances getBalances() = 0;
@@ -247,10 +247,10 @@ public:
     virtual bool hdEnabled() = 0;
 
     // Return whether the wallet is blank.
-    virtual bool canGetAddresses() const = 0;
+    virtual bool canGetAddresses() = 0;
 
-    // check if a certain wallet flag is set.
+    // Return whether private keys enabled.
-    virtual bool IsWalletFlagSet(uint64_t flag) = 0;
+    virtual bool privateKeysDisabled() = 0;
 
     // Get default address type.
     virtual OutputType getDefaultAddressType() = 0;

src/qt/bitcoingui.cpp

@@ -1258,7 +1258,7 @@ void BitcoinGUI::updateWalletStatus()
     }
     WalletModel * const walletModel = walletView->getWalletModel();
     setEncryptionStatus(walletModel->getEncryptionStatus());
-    setHDStatus(walletModel->privateKeysDisabled(), walletModel->wallet().hdEnabled());
+    setHDStatus(walletModel->wallet().privateKeysDisabled(), walletModel->wallet().hdEnabled());
 }
 #endif // ENABLE_WALLET
 

src/qt/overviewpage.cpp

@@ -161,7 +161,7 @@ void OverviewPage::setBalance(const interfaces::WalletBalances& balances)
 {
     int unit = walletModel->getOptionsModel()->getDisplayUnit();
     m_balances = balances;
-    if (walletModel->privateKeysDisabled()) {
+    if (walletModel->wallet().privateKeysDisabled()) {
         ui->labelBalance->setText(BitcoinUnits::formatWithUnit(unit, balances.watch_only_balance, false, BitcoinUnits::separatorAlways));
         ui->labelUnconfirmed->setText(BitcoinUnits::formatWithUnit(unit, balances.unconfirmed_watch_only_balance, false, BitcoinUnits::separatorAlways));
         ui->labelImmature->setText(BitcoinUnits::formatWithUnit(unit, balances.immature_watch_only_balance, false, BitcoinUnits::separatorAlways));
@@ -184,7 +184,7 @@ void OverviewPage::setBalance(const interfaces::WalletBalances& balances)
     // for symmetry reasons also show immature label when the watch-only one is shown
     ui->labelImmature->setVisible(showImmature || showWatchOnlyImmature);
     ui->labelImmatureText->setVisible(showImmature || showWatchOnlyImmature);
-    ui->labelWatchImmature->setVisible(!walletModel->privateKeysDisabled() && showWatchOnlyImmature); // show watch-only immature balance
+    ui->labelWatchImmature->setVisible(!walletModel->wallet().privateKeysDisabled() && showWatchOnlyImmature); // show watch-only immature balance
 }
 
 // show/hide watch-only labels
@@ -236,9 +236,9 @@ void OverviewPage::setWalletModel(WalletModel *model)
 
         connect(model->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &OverviewPage::updateDisplayUnit);
 
-        updateWatchOnlyLabels(wallet.haveWatchOnly() && !model->privateKeysDisabled());
+        updateWatchOnlyLabels(wallet.haveWatchOnly() && !model->wallet().privateKeysDisabled());
         connect(model, &WalletModel::notifyWatchonlyChanged, [this](bool showWatchOnly) {
-            updateWatchOnlyLabels(showWatchOnly && !walletModel->privateKeysDisabled());
+            updateWatchOnlyLabels(showWatchOnly && !walletModel->wallet().privateKeysDisabled());
         });
     }
 

src/qt/receivecoinsdialog.cpp

@@ -99,11 +99,11 @@ void ReceiveCoinsDialog::setModel(WalletModel *_model)
         }
 
         // Set the button to be enabled or disabled based on whether the wallet can give out new addresses.
-        ui->receiveButton->setEnabled(model->canGetAddresses());
+        ui->receiveButton->setEnabled(model->wallet().canGetAddresses());
 
         // Enable/disable the receive button if the wallet is now able/unable to give out new addresses.
         connect(model, &WalletModel::canGetAddressesChanged, [this] {
-            ui->receiveButton->setEnabled(model->canGetAddresses());
+            ui->receiveButton->setEnabled(model->wallet().canGetAddresses());
         });
     }
 }

src/qt/rpcconsole.cpp

@@ -1191,7 +1191,7 @@ void RPCConsole::disconnectSelectedNode()
         // Get currently selected peer address
         NodeId id = nodes.at(i).data().toLongLong();
         // Find the node, disconnect it and clear the selected node
-        if(m_node.disconnect(id))
+        if(m_node.disconnectById(id))
             clearSelectedNode();
     }
 }
@@ -1216,7 +1216,7 @@ void RPCConsole::banSelectedNode(int bantime)
         const CNodeCombinedStats *stats = clientModel->getPeerTableModel()->getNodeStats(detailNodeRow);
         if (stats) {
             m_node.ban(stats->nodeStats.addr, BanReasonManuallyAdded, bantime);
-            m_node.disconnect(stats->nodeStats.addr);
+            m_node.disconnectByAddress(stats->nodeStats.addr);
         }
     }
     clearSelectedNode();

src/qt/sendcoinsdialog.cpp

@@ -187,7 +187,7 @@ void SendCoinsDialog::setModel(WalletModel *_model)
         // set default rbf checkbox state
         ui->optInRBF->setCheckState(Qt::Checked);
 
-        if (model->privateKeysDisabled()) {
+        if (model->wallet().privateKeysDisabled()) {
             ui->sendButton->setText(tr("Cr&eate Unsigned"));
             ui->sendButton->setToolTip(tr("Creates a Partially Signed Bitcoin Transaction (PSBT) for use with e.g. an offline %1 wallet, or a PSBT-compatible hardware wallet.").arg(PACKAGE_NAME));
         }
@@ -312,14 +312,14 @@ void SendCoinsDialog::on_sendButton_clicked()
     }
 
     QString questionString;
-    if (model->privateKeysDisabled()) {
+    if (model->wallet().privateKeysDisabled()) {
         questionString.append(tr("Do you want to draft this transaction?"));
     } else {
         questionString.append(tr("Are you sure you want to send?"));
     }
 
     questionString.append("<br /><span style='font-size:10pt;'>");
-    if (model->privateKeysDisabled()) {
+    if (model->wallet().privateKeysDisabled()) {
         questionString.append(tr("Please, review your transaction proposal. This will produce a Partially Signed Bitcoin Transaction (PSBT) which you can copy and then sign with e.g. an offline %1 wallet, or a PSBT-compatible hardware wallet.").arg(PACKAGE_NAME));
     } else {
         questionString.append(tr("Please, review your transaction."));
@@ -374,8 +374,8 @@ void SendCoinsDialog::on_sendButton_clicked()
     } else {
         questionString = questionString.arg("<br /><br />" + formatted.at(0));
     }
-    const QString confirmation = model->privateKeysDisabled() ? tr("Confirm transaction proposal") : tr("Confirm send coins");
+    const QString confirmation = model->wallet().privateKeysDisabled() ? tr("Confirm transaction proposal") : tr("Confirm send coins");
-    const QString confirmButtonText = model->privateKeysDisabled() ? tr("Copy PSBT to clipboard") : tr("Send");
+    const QString confirmButtonText = model->wallet().privateKeysDisabled() ? tr("Copy PSBT to clipboard") : tr("Send");
     SendConfirmationDialog confirmationDialog(confirmation, questionString, informative_text, detailed_text, SEND_CONFIRM_DELAY, confirmButtonText, this);
     confirmationDialog.exec();
     QMessageBox::StandardButton retval = static_cast<QMessageBox::StandardButton>(confirmationDialog.result());
@@ -387,11 +387,11 @@ void SendCoinsDialog::on_sendButton_clicked()
     }
 
     bool send_failure = false;
-    if (model->privateKeysDisabled()) {
+    if (model->wallet().privateKeysDisabled()) {
         CMutableTransaction mtx = CMutableTransaction{*(currentTransaction.getWtx())};
         PartiallySignedTransaction psbtx(mtx);
         bool complete = false;
-        const TransactionError err = model->wallet().fillPSBT(psbtx, complete, SIGHASH_ALL, false /* sign */, true /* bip32derivs */);
+        const TransactionError err = model->wallet().fillPSBT(SIGHASH_ALL, false /* sign */, true /* bip32derivs */, psbtx, complete);
         assert(!complete);
         assert(err == TransactionError::OK);
         // Serialize the PSBT
@@ -562,7 +562,7 @@ void SendCoinsDialog::setBalance(const interfaces::WalletBalances& balances)
     if(model && model->getOptionsModel())
     {
         CAmount balance = balances.balance;
-        if (model->privateKeysDisabled()) {
+        if (model->wallet().privateKeysDisabled()) {
             balance = balances.watch_only_balance;
             ui->labelBalanceName->setText(tr("Watch-only balance:"));
         }
@@ -652,7 +652,7 @@ void SendCoinsDialog::useAvailableBalance(SendCoinsEntry* entry)
     }
 
     // Include watch-only for wallets without private key
-    coin_control.fAllowWatchOnly = model->privateKeysDisabled();
+    coin_control.fAllowWatchOnly = model->wallet().privateKeysDisabled();
 
     // Calculate available amount to send.
     CAmount amount = model->wallet().getAvailableBalance(coin_control);
@@ -707,7 +707,7 @@ void SendCoinsDialog::updateCoinControlState(CCoinControl& ctrl)
     ctrl.m_confirm_target = getConfTargetForIndex(ui->confTargetSelector->currentIndex());
     ctrl.m_signal_bip125_rbf = ui->optInRBF->isChecked();
     // Include watch-only for wallets without private key
-    ctrl.fAllowWatchOnly = model->privateKeysDisabled();
+    ctrl.fAllowWatchOnly = model->wallet().privateKeysDisabled();
 }
 
 void SendCoinsDialog::updateSmartFeeLabel()

src/qt/walletcontroller.cpp

@@ -218,8 +218,8 @@ void CreateWalletActivity::createWallet()
     }
 
     QTimer::singleShot(500, worker(), [this, name, flags] {
-        std::unique_ptr<interfaces::Wallet> wallet;
+        WalletCreationStatus status;
-        WalletCreationStatus status = node().createWallet(m_passphrase, flags, name, m_error_message, m_warning_message, wallet);
+        std::unique_ptr<interfaces::Wallet> wallet = node().createWallet(m_passphrase, flags, name, m_error_message, m_warning_message, status);
 
         if (status == WalletCreationStatus::SUCCESS) m_wallet_model = m_wallet_controller->getOrCreateWallet(std::move(wallet));
 

src/qt/walletmodel.cpp

@@ -23,7 +23,7 @@
 #include <ui_interface.h>
 #include <util/system.h> // for GetBoolArg
 #include <wallet/coincontrol.h>
-#include <wallet/wallet.h>
+#include <wallet/wallet.h> // for CRecipient
 
 #include <stdint.h>
 
@@ -184,7 +184,7 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
         std::string strFailReason;
 
         auto& newTx = transaction.getWtx();
-        newTx = m_wallet->createTransaction(vecSend, coinControl, !privateKeysDisabled() /* sign */, nChangePosRet, nFeeRequired, strFailReason);
+        newTx = m_wallet->createTransaction(vecSend, coinControl, !wallet().privateKeysDisabled() /* sign */, nChangePosRet, nFeeRequired, strFailReason);
         transaction.setTransactionFee(nFeeRequired);
         if (fSubtractFeeFromAmount && newTx)
             transaction.reassignAmounts(nChangePosRet);
@@ -488,7 +488,7 @@ bool WalletModel::bumpFee(uint256 hash, uint256& new_hash)
          return false;
     }
 
-    const bool create_psbt = privateKeysDisabled();
+    const bool create_psbt = m_wallet->privateKeysDisabled();
 
     // allow a user based fee verification
     QString questionString = create_psbt ? tr("Do you want to draft a transaction with fee increase?") : tr("Do you want to increase the fee?");
@@ -526,7 +526,7 @@ bool WalletModel::bumpFee(uint256 hash, uint256& new_hash)
     if (create_psbt) {
         PartiallySignedTransaction psbtx(mtx);
         bool complete = false;
-        const TransactionError err = wallet().fillPSBT(psbtx, complete, SIGHASH_ALL, false /* sign */, true /* bip32derivs */);
+        const TransactionError err = wallet().fillPSBT(SIGHASH_ALL, false /* sign */, true /* bip32derivs */, psbtx, complete);
         if (err != TransactionError::OK || complete) {
             QMessageBox::critical(nullptr, tr("Fee bump error"), tr("Can't draft transaction."));
             return false;
@@ -558,16 +558,6 @@ bool WalletModel::isWalletEnabled()
    return !gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET);
 }
 
-bool WalletModel::privateKeysDisabled() const
-{
-    return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS);
-}
-
-bool WalletModel::canGetAddresses() const
-{
-    return m_wallet->canGetAddresses();
-}
-
 QString WalletModel::getWalletName() const
 {
     return QString::fromStdString(m_wallet->getWalletName());

src/qt/walletmodel.h

@@ -140,8 +140,6 @@ public:
     bool bumpFee(uint256 hash, uint256& new_hash);
 
     static bool isWalletEnabled();
-    bool privateKeysDisabled() const;
-    bool canGetAddresses() const;
 
     interfaces::Node& node() const { return m_node; }
     interfaces::Wallet& wallet() const { return *m_wallet; }

src/wallet/wallet.cpp

@@ -344,7 +344,7 @@ bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase,
     return false;
 }
 
-void CWallet::ChainStateFlushed(const CBlockLocator& loc)
+void CWallet::chainStateFlushed(const CBlockLocator& loc)
 {
     WalletBatch batch(*database);
     batch.WriteBestBlock(loc);
@@ -1089,7 +1089,7 @@ void CWallet::SyncTransaction(const CTransactionRef& ptx, CWalletTx::Confirmatio
     MarkInputsDirty(ptx);
 }
 
-void CWallet::TransactionAddedToMempool(const CTransactionRef& ptx) {
+void CWallet::transactionAddedToMempool(const CTransactionRef& ptx) {
     auto locked_chain = chain().lock();
     LOCK(cs_wallet);
     CWalletTx::Confirmation confirm(CWalletTx::Status::UNCONFIRMED, /* block_height */ 0, {}, /* nIndex */ 0);
@@ -1101,7 +1101,7 @@ void CWallet::TransactionAddedToMempool(const CTransactionRef& ptx) {
     }
 }
 
-void CWallet::TransactionRemovedFromMempool(const CTransactionRef &ptx) {
+void CWallet::transactionRemovedFromMempool(const CTransactionRef &ptx) {
     LOCK(cs_wallet);
     auto it = mapWallet.find(ptx->GetHash());
     if (it != mapWallet.end()) {
@@ -1109,7 +1109,7 @@ void CWallet::TransactionRemovedFromMempool(const CTransactionRef &ptx) {
     }
 }
 
-void CWallet::BlockConnected(const CBlock& block, int height)
+void CWallet::blockConnected(const CBlock& block, int height)
 {
     const uint256& block_hash = block.GetHash();
     auto locked_chain = chain().lock();
@@ -1120,11 +1120,11 @@ void CWallet::BlockConnected(const CBlock& block, int height)
     for (size_t index = 0; index < block.vtx.size(); index++) {
         CWalletTx::Confirmation confirm(CWalletTx::Status::CONFIRMED, height, block_hash, index);
         SyncTransaction(block.vtx[index], confirm);
-        TransactionRemovedFromMempool(block.vtx[index]);
+        transactionRemovedFromMempool(block.vtx[index]);
     }
 }
 
-void CWallet::BlockDisconnected(const CBlock& block, int height)
+void CWallet::blockDisconnected(const CBlock& block, int height)
 {
     auto locked_chain = chain().lock();
     LOCK(cs_wallet);
@@ -1141,7 +1141,7 @@ void CWallet::BlockDisconnected(const CBlock& block, int height)
     }
 }
 
-void CWallet::UpdatedBlockTip()
+void CWallet::updatedBlockTip()
 {
     m_best_block_time = GetTime();
 }
@@ -1785,7 +1785,7 @@ bool CWalletTx::SubmitMemoryPoolAndRelay(std::string& err_string, bool relay)
     // Irrespective of the failure reason, un-marking fInMempool
     // out-of-order is incorrect - it should be unmarked when
     // TransactionRemovedFromMempool fires.
-    bool ret = pwallet->chain().broadcastTransaction(tx, err_string, pwallet->m_default_max_tx_fee, relay);
+    bool ret = pwallet->chain().broadcastTransaction(tx, pwallet->m_default_max_tx_fee, relay, err_string);
     fInMempool |= ret;
     return ret;
 }
@@ -3875,7 +3875,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         }
 
         auto locked_chain = chain.lock();
-        walletInstance->ChainStateFlushed(locked_chain->getTipLocator());
+        walletInstance->chainStateFlushed(locked_chain->getTipLocator());
     } else if (wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS) {
         // Make it impossible to disable private keys after creation
         error = strprintf(_("Error loading %s: Private keys can only be disabled during creation").translated, walletFile);
@@ -4056,7 +4056,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
                 return nullptr;
             }
         }
-        walletInstance->ChainStateFlushed(locked_chain->getTipLocator());
+        walletInstance->chainStateFlushed(locked_chain->getTipLocator());
         walletInstance->database->IncrementUpdateCounter();
 
         // Restore wallet transaction metadata after -zapwallettxes=1

src/wallet/wallet.h

@@ -875,10 +875,10 @@ public:
     void MarkDirty();
     bool AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose=true);
     void LoadToWallet(CWalletTx& wtxIn) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
-    void TransactionAddedToMempool(const CTransactionRef& tx) override;
+    void transactionAddedToMempool(const CTransactionRef& tx) override;
-    void BlockConnected(const CBlock& block, int height) override;
+    void blockConnected(const CBlock& block, int height) override;
-    void BlockDisconnected(const CBlock& block, int height) override;
+    void blockDisconnected(const CBlock& block, int height) override;
-    void UpdatedBlockTip() override;
+    void updatedBlockTip() override;
     int64_t RescanFromTime(int64_t startTime, const WalletRescanReserver& reserver, bool update);
 
     struct ScanResult {
@@ -897,7 +897,7 @@ public:
         uint256 last_failed_block;
     };
     ScanResult ScanForWalletTransactions(const uint256& first_block, const uint256& last_block, const WalletRescanReserver& reserver, bool fUpdate);
-    void TransactionRemovedFromMempool(const CTransactionRef &ptx) override;
+    void transactionRemovedFromMempool(const CTransactionRef &ptx) override;
     void ReacceptWalletTransactions() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
     void ResendWalletTransactions();
     struct Balance {
@@ -1033,7 +1033,7 @@ public:
     bool IsAllFromMe(const CTransaction& tx, const isminefilter& filter) const;
     CAmount GetCredit(const CTransaction& tx, const isminefilter& filter) const;
     CAmount GetChange(const CTransaction& tx) const;
-    void ChainStateFlushed(const CBlockLocator& loc) override;
+    void chainStateFlushed(const CBlockLocator& loc) override;
 
     DBErrors LoadWallet(bool& fFirstRunRet);
     DBErrors ZapWalletTx(std::vector<CWalletTx>& vWtx);