Get rid of PendingWalletTx class.

No reason for this class to exist if it doesn't have any code to run in the
destructor. e10e1e8db0 from
https://github.com/bitcoin/bitcoin/pull/16208 recently removed code destructor
code that would return an unused key if the transaction wasn't committed.

src/interfaces/wallet.cpp

@@ -33,31 +33,6 @@
 namespace interfaces {
 namespace {
 
-class PendingWalletTxImpl : public PendingWalletTx
-{
-public:
-    explicit PendingWalletTxImpl(CWallet& wallet) : m_wallet(wallet) {}
-
-    const CTransaction& get() override { return *m_tx; }
-
-    bool commit(WalletValueMap value_map,
-        WalletOrderForm order_form,
-        std::string& reject_reason) override
-    {
-        auto locked_chain = m_wallet.chain().lock();
-        LOCK(m_wallet.cs_wallet);
-        CValidationState state;
-        if (!m_wallet.CommitTransaction(m_tx, std::move(value_map), std::move(order_form), state)) {
-            reject_reason = state.GetRejectReason();
-            return false;
-        }
-        return true;
-    }
-
-    CTransactionRef m_tx;
-    CWallet& m_wallet;
-};
-
 //! Construct wallet tx struct.
 WalletTx MakeWalletTx(interfaces::Chain::Lock& locked_chain, CWallet& wallet, const CWalletTx& wtx)
 {
@@ -227,7 +202,7 @@ public:
         LOCK(m_wallet->cs_wallet);
         return m_wallet->ListLockedCoins(outputs);
     }
-    std::unique_ptr<PendingWalletTx> createTransaction(const std::vector<CRecipient>& recipients,
+    CTransactionRef createTransaction(const std::vector<CRecipient>& recipients,
         const CCoinControl& coin_control,
         bool sign,
         int& change_pos,
@@ -236,12 +211,26 @@ public:
     {
         auto locked_chain = m_wallet->chain().lock();
         LOCK(m_wallet->cs_wallet);
-        auto pending = MakeUnique<PendingWalletTxImpl>(*m_wallet);
-        if (!m_wallet->CreateTransaction(*locked_chain, recipients, pending->m_tx, fee, change_pos,
+        CTransactionRef tx;
+        if (!m_wallet->CreateTransaction(*locked_chain, recipients, tx, fee, change_pos,
                 fail_reason, coin_control, sign)) {
             return {};
         }
-        return std::move(pending);
+        return tx;
+    }
+    bool commitTransaction(CTransactionRef tx,
+        WalletValueMap value_map,
+        WalletOrderForm order_form,
+        std::string& reject_reason) override
+    {
+        auto locked_chain = m_wallet->chain().lock();
+        LOCK(m_wallet->cs_wallet);
+        CValidationState state;
+        if (!m_wallet->CommitTransaction(std::move(tx), std::move(value_map), std::move(order_form), state)) {
+            reject_reason = state.GetRejectReason();
+            return false;
+        }
+        return true;
     }
     bool transactionCanBeAbandoned(const uint256& txid) override { return m_wallet->TransactionCanBeAbandoned(txid); }
     bool abandonTransaction(const uint256& txid) override

src/interfaces/wallet.h

@@ -34,7 +34,6 @@ struct CRecipient;
 namespace interfaces {
 
 class Handler;
-class PendingWalletTx;
 struct WalletAddress;
 struct WalletBalances;
 struct WalletTx;
@@ -134,13 +133,19 @@ public:
     virtual void listLockedCoins(std::vector<COutPoint>& outputs) = 0;
 
     //! Create transaction.
-    virtual std::unique_ptr<PendingWalletTx> createTransaction(const std::vector<CRecipient>& recipients,
+    virtual CTransactionRef createTransaction(const std::vector<CRecipient>& recipients,
         const CCoinControl& coin_control,
         bool sign,
         int& change_pos,
         CAmount& fee,
         std::string& fail_reason) = 0;
 
+    //! Commit transaction.
+    virtual bool commitTransaction(CTransactionRef tx,
+        WalletValueMap value_map,
+        WalletOrderForm order_form,
+        std::string& reject_reason) = 0;
+
     //! Return whether transaction can be abandoned.
     virtual bool transactionCanBeAbandoned(const uint256& txid) = 0;
 
@@ -288,21 +293,6 @@ public:
     virtual std::unique_ptr<Handler> handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) = 0;
 };
 
-//! Tracking object returned by CreateTransaction and passed to CommitTransaction.
-class PendingWalletTx
-{
-public:
-    virtual ~PendingWalletTx() {}
-
-    //! Get transaction data.
-    virtual const CTransaction& get() = 0;
-
-    //! Send pending transaction and commit to wallet.
-    virtual bool commit(WalletValueMap value_map,
-        WalletOrderForm order_form,
-        std::string& reject_reason) = 0;
-};
-
 //! Information about one wallet address.
 struct WalletAddress
 {

src/qt/sendcoinsdialog.cpp

@@ -392,7 +392,7 @@ void SendCoinsDialog::on_sendButton_clicked()
         accept();
         CoinControlDialog::coinControl()->UnSelectAll();
         coinControlUpdateLabels();
-        Q_EMIT coinsSent(currentTransaction.getWtx()->get().GetHash());
+        Q_EMIT coinsSent(currentTransaction.getWtx()->GetHash());
     }
     fNewRecipientAllowed = true;
 }

src/qt/walletmodel.cpp

@@ -261,11 +261,11 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &tran
 
         auto& newTx = transaction.getWtx();
         std::string rejectReason;
-        if (!newTx->commit({} /* mapValue */, std::move(vOrderForm), rejectReason))
+        if (!wallet().commitTransaction(newTx, {} /* mapValue */, std::move(vOrderForm), rejectReason))
             return SendCoinsReturn(TransactionCommitFailed, QString::fromStdString(rejectReason));
 
         CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
-        ssTx << newTx->get();
+        ssTx << *newTx;
         transaction_array.append(&(ssTx[0]), ssTx.size());
     }
 

src/qt/walletmodeltransaction.cpp

@@ -21,14 +21,14 @@ QList<SendCoinsRecipient> WalletModelTransaction::getRecipients() const
     return recipients;
 }
 
-std::unique_ptr<interfaces::PendingWalletTx>& WalletModelTransaction::getWtx()
+CTransactionRef& WalletModelTransaction::getWtx()
 {
     return wtx;
 }
 
 unsigned int WalletModelTransaction::getTransactionSize()
 {
-    return wtx ? GetVirtualTransactionSize(wtx->get()) : 0;
+    return wtx ? GetVirtualTransactionSize(*wtx) : 0;
 }
 
 CAmount WalletModelTransaction::getTransactionFee() const
@@ -43,7 +43,7 @@ void WalletModelTransaction::setTransactionFee(const CAmount& newFee)
 
 void WalletModelTransaction::reassignAmounts(int nChangePosRet)
 {
-    const CTransaction* walletTransaction = &wtx->get();
+    const CTransaction* walletTransaction = wtx.get();
     int i = 0;
     for (QList<SendCoinsRecipient>::iterator it = recipients.begin(); it != recipients.end(); ++it)
     {

src/qt/walletmodeltransaction.h

@@ -16,7 +16,6 @@ class SendCoinsRecipient;
 
 namespace interfaces {
 class Node;
-class PendingWalletTx;
 }
 
 /** Data model for a walletmodel transaction. */
@@ -27,7 +26,7 @@ public:
 
     QList<SendCoinsRecipient> getRecipients() const;
 
-    std::unique_ptr<interfaces::PendingWalletTx>& getWtx();
+    CTransactionRef& getWtx();
     unsigned int getTransactionSize();
 
     void setTransactionFee(const CAmount& newFee);
@@ -39,7 +38,7 @@ public:
 
 private:
     QList<SendCoinsRecipient> recipients;
-    std::unique_ptr<interfaces::PendingWalletTx> wtx;
+    CTransactionRef wtx;
     CAmount fee;
 };