[wallet] Remove return value from CommitTransaction()

CommitTransaction returns a bool to indicate success, but since commit
b3a7410 it only returns true, even if the transaction was not
successfully broadcast. This commit changes CommitTransaction() to return
void.

All dead code in `if (!CommitTransaction())` branches has been removed.

Author: jnewbery

src/interfaces/wallet.cpp

@@ -218,19 +218,14 @@ class WalletImpl : public Wallet
         }
         return tx;
     }
-    bool commitTransaction(CTransactionRef tx,
+    void commitTransaction(CTransactionRef tx,
         WalletValueMap value_map,
-        WalletOrderForm order_form,
-        std::string& reject_reason) override
+        WalletOrderForm order_form) 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;
+        m_wallet->CommitTransaction(std::move(tx), std::move(value_map), std::move(order_form), state);
     }
     bool transactionCanBeAbandoned(const uint256& txid) override { return m_wallet->TransactionCanBeAbandoned(txid); }
     bool abandonTransaction(const uint256& txid) override

src/interfaces/wallet.h

@@ -141,10 +141,9 @@ class Wallet
         std::string& fail_reason) = 0;
 
     //! Commit transaction.
-    virtual bool commitTransaction(CTransactionRef tx,
+    virtual void commitTransaction(CTransactionRef tx,
         WalletValueMap value_map,
-        WalletOrderForm order_form,
-        std::string& reject_reason) = 0;
+        WalletOrderForm order_form) = 0;
 
     //! Return whether transaction can be abandoned.
     virtual bool transactionCanBeAbandoned(const uint256& txid) = 0;

src/qt/sendcoinsdialog.cpp

@@ -558,8 +558,7 @@ void SendCoinsDialog::processSendCoinsReturn(const WalletModel::SendCoinsReturn
     msgParams.second = CClientUIInterface::MSG_WARNING;
 
     // This comment is specific to SendCoinsDialog usage of WalletModel::SendCoinsReturn.
-    // WalletModel::TransactionCommitFailed is used only in WalletModel::sendCoins()
-    // all others are used only in WalletModel::prepareTransaction()
+    // All status values are used only in WalletModel::prepareTransaction()
     switch(sendCoinsReturn.status)
     {
     case WalletModel::InvalidAddress:
@@ -581,10 +580,6 @@ void SendCoinsDialog::processSendCoinsReturn(const WalletModel::SendCoinsReturn
         msgParams.first = tr("Transaction creation failed!");
         msgParams.second = CClientUIInterface::MSG_ERROR;
         break;
-    case WalletModel::TransactionCommitFailed:
-        msgParams.first = tr("The transaction was rejected with the following reason: %1").arg(sendCoinsReturn.reasonCommitFailed);
-        msgParams.second = CClientUIInterface::MSG_ERROR;
-        break;
     case WalletModel::AbsurdFee:
         msgParams.first = tr("A fee higher than %1 is considered an absurdly high fee.").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), model->wallet().getDefaultMaxTxFee()));
         break;

src/qt/walletmodel.cpp

@@ -260,9 +260,7 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &tran
         }
 
         auto& newTx = transaction.getWtx();
-        std::string rejectReason;
-        if (!wallet().commitTransaction(newTx, {} /* mapValue */, std::move(vOrderForm), rejectReason))
-            return SendCoinsReturn(TransactionCommitFailed, QString::fromStdString(rejectReason));
+        wallet().commitTransaction(newTx, {} /* mapValue */, std::move(vOrderForm));
 
         CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
         ssTx << *newTx;

src/qt/walletmodel.h

@@ -139,7 +139,6 @@ class WalletModel : public QObject
         AmountWithFeeExceedsBalance,
         DuplicateAddress,
         TransactionCreationFailed, // Error returned when wallet is still locked
-        TransactionCommitFailed,
         AbsurdFee,
         PaymentRequestExpired
     };

src/wallet/feebumper.cpp

@@ -394,11 +394,7 @@ Result CommitTransaction(CWallet& wallet, const uint256& txid, CMutableTransacti
     mapValue["replaces_txid"] = oldWtx.GetHash().ToString();
 
     CValidationState state;
-    if (!wallet.CommitTransaction(tx, std::move(mapValue), oldWtx.vOrderForm, state)) {
-        // NOTE: CommitTransaction never returns false, so this should never happen.
-        errors.push_back(strprintf("The transaction was rejected: %s", FormatStateMessage(state)));
-        return Result::WALLET_ERROR;
-    }
+    wallet.CommitTransaction(tx, std::move(mapValue), oldWtx.vOrderForm, state);
 
     bumped_txid = tx->GetHash();
     if (state.IsInvalid()) {

src/wallet/rpcwallet.cpp

@@ -343,10 +343,7 @@ static CTransactionRef SendMoney(interfaces::Chain::Lock& locked_chain, CWallet
         throw JSONRPCError(RPC_WALLET_ERROR, strError);
     }
     CValidationState state;
-    if (!pwallet->CommitTransaction(tx, std::move(mapValue), {} /* orderForm */, state)) {
-        strError = strprintf("Error: The transaction was rejected! Reason given: %s", FormatStateMessage(state));
-        throw JSONRPCError(RPC_WALLET_ERROR, strError);
-    }
+    pwallet->CommitTransaction(tx, std::move(mapValue), {} /* orderForm */, state);
     return tx;
 }
 
@@ -928,11 +925,7 @@ static UniValue sendmany(const JSONRPCRequest& request)
     if (!fCreated)
         throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, strFailReason);
     CValidationState state;
-    if (!pwallet->CommitTransaction(tx, std::move(mapValue), {} /* orderForm */, state)) {
-        strFailReason = strprintf("Transaction commit failed:: %s", FormatStateMessage(state));
-        throw JSONRPCError(RPC_WALLET_ERROR, strFailReason);
-    }
-
+    pwallet->CommitTransaction(tx, std::move(mapValue), {} /* orderForm */, state);
     return tx->GetHash().GetHex();
 }
 

src/wallet/test/wallet_tests.cpp

@@ -452,7 +452,7 @@ class ListCoinsTestingSetup : public TestChain100Setup
             BOOST_CHECK(wallet->CreateTransaction(*locked_chain, {recipient}, tx, fee, changePos, error, dummy));
         }
         CValidationState state;
-        BOOST_CHECK(wallet->CommitTransaction(tx, {}, {}, state));
+        wallet->CommitTransaction(tx, {}, {}, state);
         CMutableTransaction blocktx;
         {
             LOCK(wallet->cs_wallet);

src/wallet/wallet.cpp

@@ -3286,7 +3286,7 @@ bool CWallet::CreateTransaction(interfaces::Chain::Lock& locked_chain, const std
     return true;
 }
 
-bool CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm, CValidationState& state)
+void CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm, CValidationState& state)
 {
     auto locked_chain = chain().lock();
     LOCK(cs_wallet);
@@ -3314,15 +3314,16 @@ bool CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::ve
     // fInMempool flag is cached properly
     CWalletTx& wtx = mapWallet.at(wtxNew.GetHash());
 
-    if (fBroadcastTransactions) {
-        std::string err_string;
-        if (!wtx.SubmitMemoryPoolAndRelay(err_string, true, *locked_chain)) {
-            WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n", err_string);
-            // TODO: if we expect the failure to be long term or permanent, instead delete wtx from the wallet and return failure.
-        }
+    if (!fBroadcastTransactions) {
+        // Don't submit tx to the mempool
+        return;
     }
 
-    return true;
+    std::string err_string;
+    if (!wtx.SubmitMemoryPoolAndRelay(err_string, true, *locked_chain)) {
+        WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n", err_string);
+        // TODO: if we expect the failure to be long term or permanent, instead delete wtx from the wallet and return failure.
+    }
 }
 
 DBErrors CWallet::LoadWallet(bool& fFirstRunRet)

src/wallet/wallet.h

@@ -1157,7 +1157,7 @@ class CWallet final : public FillableSigningProvider, private interfaces::Chain:
      * @param orderForm[in] BIP 70 / BIP 21 order form details to be set on the transaction.
      * @param state[in,out] CValidationState object returning information about whether the transaction was accepted
      */
-    bool CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm, CValidationState& state);
+    void CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm, CValidationState& state);
 
     bool DummySignTx(CMutableTransaction &txNew, const std::set<CTxOut> &txouts, bool use_max_sig = false) const
     {