refactor: Replace BResult with util::Result

Rename BResult class to util::Result and update the class interface to be more
compatible with std::optional and with a full-featured result class implemented
in #25665. Motivation for this change is
to update existing BResult usages now so they don't have to change later when
more features are added to the Result class.

src/Makefile.test.include

@@ -118,6 +118,7 @@ BITCOIN_TESTS =\
   test/raii_event_tests.cpp \
   test/random_tests.cpp \
   test/rest_tests.cpp \
+  test/result_tests.cpp \
   test/reverselock_tests.cpp \
   test/rpc_tests.cpp \
   test/sanity_tests.cpp \

src/bench/wallet_loading.cpp

@@ -46,10 +46,10 @@ static void BenchUnloadWallet(std::shared_ptr<CWallet>&& wallet)
 static void AddTx(CWallet& wallet)
 {
     const auto& dest = wallet.GetNewDestination(OutputType::BECH32, "");
-    assert(dest.HasRes());
+    assert(dest);
 
     CMutableTransaction mtx;
-    mtx.vout.push_back({COIN, GetScriptForDestination(dest.GetObj())});
+    mtx.vout.push_back({COIN, GetScriptForDestination(*dest)});
     mtx.vin.push_back(CTxIn());
 
     wallet.AddToWallet(MakeTransactionRef(mtx), TxStateInactive{});

src/interfaces/wallet.h

@@ -88,7 +88,7 @@ class Wallet
     virtual std::string getWalletName() = 0;
 
     // Get a new address.
-    virtual BResult<CTxDestination> getNewDestination(const OutputType type, const std::string label) = 0;
+    virtual util::Result<CTxDestination> getNewDestination(const OutputType type, const std::string label) = 0;
 
     //! Get public key.
     virtual bool getPubKey(const CScript& script, const CKeyID& address, CPubKey& pub_key) = 0;
@@ -139,7 +139,7 @@ class Wallet
     virtual void listLockedCoins(std::vector<COutPoint>& outputs) = 0;
 
     //! Create transaction.
-    virtual BResult<CTransactionRef> createTransaction(const std::vector<wallet::CRecipient>& recipients,
+    virtual util::Result<CTransactionRef> createTransaction(const std::vector<wallet::CRecipient>& recipients,
         const wallet::CCoinControl& coin_control,
         bool sign,
         int& change_pos,
@@ -329,7 +329,7 @@ class WalletLoader : public ChainClient
    virtual std::string getWalletDir() = 0;
 
    //! Restore backup wallet
-   virtual BResult<std::unique_ptr<Wallet>> restoreWallet(const fs::path& backup_file, const std::string& wallet_name, std::vector<bilingual_str>& warnings) = 0;
+   virtual util::Result<std::unique_ptr<Wallet>> restoreWallet(const fs::path& backup_file, const std::string& wallet_name, std::vector<bilingual_str>& warnings) = 0;
 
    //! Return available wallets in wallet directory.
    virtual std::vector<std::string> listWalletDir() = 0;

src/qt/addresstablemodel.cpp

@@ -384,7 +384,7 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
                 return QString();
             }
         }
-        strAddress = EncodeDestination(op_dest.GetObj());
+        strAddress = EncodeDestination(*op_dest);
     }
     else
     {

src/qt/walletcontroller.cpp

@@ -393,8 +393,8 @@ void RestoreWalletActivity::restore(const fs::path& backup_file, const std::stri
     QTimer::singleShot(0, worker(), [this, backup_file, wallet_name] {
         auto wallet{node().walletLoader().restoreWallet(backup_file, wallet_name, m_warning_message)};
 
-        m_error_message = wallet ? bilingual_str{} : wallet.GetError();
-        if (wallet) m_wallet_model = m_wallet_controller->getOrCreateWallet(wallet.ReleaseObj());
+        m_error_message = wallet ? bilingual_str{} : util::ErrorString(wallet);
+        if (wallet) m_wallet_model = m_wallet_controller->getOrCreateWallet(std::move(*wallet));
 
         QTimer::singleShot(0, this, &RestoreWalletActivity::finish);
     });

src/qt/walletmodel.cpp

@@ -207,7 +207,7 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
 
         auto& newTx = transaction.getWtx();
         const auto& res = m_wallet->createTransaction(vecSend, coinControl, !wallet().privateKeysDisabled() /* sign */, nChangePosRet, nFeeRequired);
-        newTx = res ? res.GetObj() : nullptr;
+        newTx = res ? *res : nullptr;
         transaction.setTransactionFee(nFeeRequired);
         if (fSubtractFeeFromAmount && newTx)
             transaction.reassignAmounts(nChangePosRet);
@@ -218,7 +218,7 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
             {
                 return SendCoinsReturn(AmountWithFeeExceedsBalance);
             }
-            Q_EMIT message(tr("Send Coins"), QString::fromStdString(res.GetError().translated),
+            Q_EMIT message(tr("Send Coins"), QString::fromStdString(util::ErrorString(res).translated),
                 CClientUIInterface::MSG_ERROR);
             return TransactionCreationFailed;
         }

src/test/result_tests.cpp

@@ -0,0 +1,71 @@
+// Copyright (c) 2022 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <util/result.h>
+
+#include <boost/test/unit_test.hpp>
+
+BOOST_AUTO_TEST_SUITE(result_tests)
+
+struct NoCopy
+{
+    NoCopy(int n) : m_n{std::make_unique<int>(n)} {}
+    std::unique_ptr<int> m_n;
+};
+
+bool operator==(const NoCopy& a, const NoCopy& b)
+{
+    return *a.m_n == *b.m_n;
+}
+
+std::ostream& operator<<(std::ostream& os, const NoCopy& o)
+{
+    if (o.m_n) os << "NoCopy(" << *o.m_n << ")"; else os << "NoCopy(nullptr)";
+    return os;
+}
+
+util::Result<int> IntFn(int i, bool success)
+{
+    if (success) return i;
+    return {util::Error{Untranslated(strprintf("int %i error.", i))}};
+}
+
+util::Result<NoCopy> NoCopyFn(int i, bool success)
+{
+    if (success) return {i};
+    return {util::Error{Untranslated(strprintf("nocopy %i error.", i))}};
+}
+
+template<typename T>
+void ExpectResult(const util::Result<T>& result, bool success, const bilingual_str& str)
+{
+    BOOST_CHECK_EQUAL(bool(result), success);
+    BOOST_CHECK_EQUAL(ErrorString(result).original, str.original);
+    BOOST_CHECK_EQUAL(ErrorString(result).translated, str.translated);
+}
+
+template<typename T, typename... Args>
+void ExpectSuccess(const util::Result<T>& result, const bilingual_str& str, Args&&... args)
+{
+    ExpectResult(result, true, str);
+    BOOST_CHECK_EQUAL(result.has_value(), true);
+    BOOST_CHECK_EQUAL(result.value(), T{std::forward<Args>(args)...});
+    BOOST_CHECK_EQUAL(&result.value(), &*result);
+}
+
+template<typename T, typename... Args>
+void ExpectFail(const util::Result<T>& result, const bilingual_str& str)
+{
+    ExpectResult(result, false, str);
+}
+
+BOOST_AUTO_TEST_CASE(check_returned)
+{
+    ExpectSuccess(IntFn(5, true), {}, 5);
+    ExpectFail(IntFn(5, false), Untranslated("int 5 error."));
+    ExpectSuccess(NoCopyFn(5, true), {}, 5);
+    ExpectFail(NoCopyFn(5, false), Untranslated("nocopy 5 error."));
+}
+
+BOOST_AUTO_TEST_SUITE_END()

src/test/util/wallet.cpp

@@ -21,9 +21,9 @@ std::string getnewaddress(CWallet& w)
 {
     constexpr auto output_type = OutputType::BECH32;
     auto op_dest = w.GetNewDestination(output_type, "");
-    assert(op_dest.HasRes());
+    assert(op_dest);
 
-    return EncodeDestination(op_dest.GetObj());
+    return EncodeDestination(*op_dest);
 }
 
 #endif // ENABLE_WALLET

src/util/result.h

@@ -9,41 +9,60 @@
 
 #include <variant>
 
-/*
- * 'BResult' is a generic class useful for wrapping a return object
- * (in case of success) or propagating the error cause.
-*/
+namespace util {
+
+struct Error { bilingual_str message; };
+
+//! The util::Result class provides a standard way for functions to return error
+//! and in addition to optional result values.
+//!
+//! It is intended for high-level functions that need to report error strings to
+//! end users. Lower-level functions that don't need this error-reporting and
+//! only need error-handling should avoid util::Result and instead use standard
+//! classes like std::optional, std::variant, and std::tuple, or custom structs
+//! and enum types to return function results.
+//!
+//! Usage examples can be found in \example ../test/result_tests.cpp, but in
+//! general code returning `util::Result<T>` values is very similar to code
+//! returning `std::optional<T>` values. Existing functions returning
+//! `std::optional<T>` can be updated to return `util::Result<T>` and return
+//! error strings usually just replacing `return std::nullopt;` with `return
+//! util::Error{error_string};`.
 template<class T>
-class BResult {
+class Result {
 private:
     std::variant<bilingual_str, T> m_variant;
 
+    template <typename FT>
+    friend class Result;
+    template <typename FT>
+    friend bilingual_str ErrorString(const Result<FT>& result);
+
 public:
-    BResult() : m_variant{Untranslated("")} {}
-    BResult(T obj) : m_variant{std::move(obj)} {}
-    BResult(bilingual_str error) : m_variant{std::move(error)} {}
-
-    /* Whether the function succeeded or not */
-    bool HasRes() const { return std::holds_alternative<T>(m_variant); }
-
-    /* In case of success, the result object */
-    const T& GetObj() const {
-        assert(HasRes());
-        return std::get<T>(m_variant);
-    }
-    T ReleaseObj()
-    {
-        assert(HasRes());
-        return std::move(std::get<T>(m_variant));
-    }
-
-    /* In case of failure, the error cause */
-    const bilingual_str& GetError() const {
-        assert(!HasRes());
-        return std::get<bilingual_str>(m_variant);
-    }
-
-    explicit operator bool() const { return HasRes(); }
+    Result(T obj) : m_variant{std::move(obj)} {}
+    Result(Error error) : m_variant{std::move(error.message)} {}
+    template <typename OT>
+    Result(Error error, Result<OT>&& other) : m_variant{std::move(std::get<0>(other.m_variant))} {}
+
+    //! std::optional methods, so functions returning optional<T> can change to
+    //! return Result<T> with minimal changes to existing code, and vice versa.
+    bool has_value() const { return m_variant.index() == 1; }
+    const T& value() const { assert(*this); return std::get<1>(m_variant); }
+    T& value() { assert(*this); return std::get<1>(m_variant); }
+    template <typename U>
+    T value_or(const U& default_value) const { return has_value() ? value() : default_value; }
+    operator bool() const { return has_value(); }
+    const T* operator->() const { return &value(); }
+    const T& operator*() const { return value(); }
+    T* operator->() { return &value(); }
+    T& operator*() { return value(); }
 };
 
+template <typename T>
+bilingual_str ErrorString(const Result<T>& result)
+{
+    return result ? bilingual_str{} : std::get<0>(result.m_variant);
+}
+} // namespace util
+
 #endif // BITCOIN_UTIL_RESULT_H

src/wallet/feebumper.cpp

@@ -221,11 +221,11 @@ Result CreateRateBumpTransaction(CWallet& wallet, const uint256& txid, const CCo
     constexpr int RANDOM_CHANGE_POSITION = -1;
     auto res = CreateTransaction(wallet, recipients, RANDOM_CHANGE_POSITION, new_coin_control, false);
     if (!res) {
-        errors.push_back(Untranslated("Unable to create transaction.") + Untranslated(" ") + res.GetError());
+        errors.push_back(Untranslated("Unable to create transaction.") + Untranslated(" ") + util::ErrorString(res));
         return Result::WALLET_ERROR;
     }
 
-    const auto& txr = res.GetObj();
+    const auto& txr = *res;
     // Write back new fee if successful
     new_fee = txr.fee;
 

src/wallet/interfaces.cpp

@@ -146,7 +146,7 @@ class WalletImpl : public Wallet
     void abortRescan() override { m_wallet->AbortRescan(); }
     bool backupWallet(const std::string& filename) override { return m_wallet->BackupWallet(filename); }
     std::string getWalletName() override { return m_wallet->GetName(); }
-    BResult<CTxDestination> getNewDestination(const OutputType type, const std::string label) override
+    util::Result<CTxDestination> getNewDestination(const OutputType type, const std::string label) override
     {
         LOCK(m_wallet->cs_wallet);
         return m_wallet->GetNewDestination(type, label);
@@ -249,17 +249,17 @@ class WalletImpl : public Wallet
         LOCK(m_wallet->cs_wallet);
         return m_wallet->ListLockedCoins(outputs);
     }
-    BResult<CTransactionRef> createTransaction(const std::vector<CRecipient>& recipients,
+    util::Result<CTransactionRef> createTransaction(const std::vector<CRecipient>& recipients,
         const CCoinControl& coin_control,
         bool sign,
         int& change_pos,
         CAmount& fee) override
     {
         LOCK(m_wallet->cs_wallet);
-        const auto& res = CreateTransaction(*m_wallet, recipients, change_pos,
+        auto res = CreateTransaction(*m_wallet, recipients, change_pos,
                                      coin_control, sign);
-        if (!res) return res.GetError();
-        const auto& txr = res.GetObj();
+        if (!res) return {util::Error{}, std::move(res)};
+        const auto& txr = *res;
         fee = txr.fee;
         change_pos = txr.change_pos;
 
@@ -569,12 +569,12 @@ class WalletLoaderImpl : public WalletLoader
         options.require_existing = true;
         return MakeWallet(m_context, LoadWallet(m_context, name, true /* load_on_start */, options, status, error, warnings));
     }
-    BResult<std::unique_ptr<Wallet>> restoreWallet(const fs::path& backup_file, const std::string& wallet_name, std::vector<bilingual_str>& warnings) override
+    util::Result<std::unique_ptr<Wallet>> restoreWallet(const fs::path& backup_file, const std::string& wallet_name, std::vector<bilingual_str>& warnings) override
     {
         DatabaseStatus status;
         bilingual_str error;
-        BResult<std::unique_ptr<Wallet>> wallet{MakeWallet(m_context, RestoreWallet(m_context, backup_file, wallet_name, /*load_on_start=*/true, status, error, warnings))};
-        if (!wallet) return error;
+        util::Result<std::unique_ptr<Wallet>> wallet{MakeWallet(m_context, RestoreWallet(m_context, backup_file, wallet_name, /*load_on_start=*/true, status, error, warnings))};
+        if (!wallet) return {util::Error{error}};
         return wallet;
     }
     std::string getWalletDir() override

src/wallet/rpc/addresses.cpp

@@ -60,10 +60,10 @@ RPCHelpMan getnewaddress()
 
     auto op_dest = pwallet->GetNewDestination(output_type, label);
     if (!op_dest) {
-        throw JSONRPCError(RPC_WALLET_KEYPOOL_RAN_OUT, op_dest.GetError().original);
+        throw JSONRPCError(RPC_WALLET_KEYPOOL_RAN_OUT, util::ErrorString(op_dest).original);
     }
 
-    return EncodeDestination(op_dest.GetObj());
+    return EncodeDestination(*op_dest);
 },
     };
 }
@@ -107,9 +107,9 @@ RPCHelpMan getrawchangeaddress()
 
     auto op_dest = pwallet->GetNewChangeDestination(output_type);
     if (!op_dest) {
-        throw JSONRPCError(RPC_WALLET_KEYPOOL_RAN_OUT, op_dest.GetError().original);
+        throw JSONRPCError(RPC_WALLET_KEYPOOL_RAN_OUT, util::ErrorString(op_dest).original);
     }
-    return EncodeDestination(op_dest.GetObj());
+    return EncodeDestination(*op_dest);
 },
     };
 }

src/wallet/rpc/spend.cpp

@@ -158,14 +158,14 @@ UniValue SendMoney(CWallet& wallet, const CCoinControl &coin_control, std::vecto
     constexpr int RANDOM_CHANGE_POSITION = -1;
     auto res = CreateTransaction(wallet, recipients, RANDOM_CHANGE_POSITION, coin_control, true);
     if (!res) {
-        throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, res.GetError().original);
+        throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, util::ErrorString(res).original);
     }
-    const CTransactionRef& tx = res.GetObj().tx;
+    const CTransactionRef& tx = res->tx;
     wallet.CommitTransaction(tx, std::move(map_value), {} /* orderForm */);
     if (verbose) {
         UniValue entry(UniValue::VOBJ);
         entry.pushKV("txid", tx->GetHash().GetHex());
-        entry.pushKV("fee_reason", StringForFeeReason(res.GetObj().fee_calc.reason));
+        entry.pushKV("fee_reason", StringForFeeReason(res->fee_calc.reason));
         return entry;
     }
     return tx->GetHash().GetHex();