Merge #17070: wallet: Avoid showing GUI popups on RPC errors

facec1c643105d0ae74b5d32cf33d593f9e82a36 wallet: Avoid showing GUI popups on RPC errors (MarcoFalke)

Pull request description:

  RPC errors and warnings are shown as popups in the GUI instead of being returned to the RPC caller. For example,

  ```
  $ ./src/bitcoin-cli loadwallet $(pwd)/./test/functional/data/wallets/high_minversion/
  error code: -4
  error message:
  Wallet loading failed.
  ```

  gives me a GUI popup and no reason why loading the wallet failed.

  After this pull request:

  ```
  $ ./src/bitcoin-cli loadwallet $(pwd)/./test/functional/data/wallets/high_minversion/
  error code: -4
  error message:
  Wallet loading failed: Error loading /home/marco/workspace/btc_bitcoin_core/./test/functional/data/wallets/high_minversion/wallet.dat: Wallet requires newer version of Bitcoin Core

ACKs for top commit:
  laanwj:
    Code review ACK facec1c643105d0ae74b5d32cf33d593f9e82a36

Tree-SHA512: c8274bbb02cfcf71676eeec1e773e51fb3538cf93f82e7cb8536f4716d44ed819cdc162dfc039ac7386a4db381a734cdb27fd32567043a1180c02519fbcba194

13 files changed, 89 insertions, 91 deletions

diff --git a/src/dummywallet.cpp b/src/dummywallet.cpp
index e5e563f3e9..0edcb0286d 100644
--- a/src/dummywallet.cpp
+++ b/src/dummywallet.cpp
@@ -70,12 +70,12 @@ std::vector<std::shared_ptr<CWallet>> GetWallets()
     throw std::logic_error("Wallet function called in non-wallet build.");
 }
 
-std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::string& warning)
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::vector<std::string>& warnings)
 {
     throw std::logic_error("Wallet function called in non-wallet build.");
 }
 
-WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::string& warning, std::shared_ptr<CWallet>& result)
+WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::vector<std::string>& warnings, std::shared_ptr<CWallet>& result)
 {
     throw std::logic_error("Wallet function called in non-wallet build.");
 }
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index 0b7a1534ab..227ac9f7b9 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -40,8 +40,8 @@ class CWallet;
 fs::path GetWalletDir();
 std::vector<fs::path> ListWalletDir();
 std::vector<std::shared_ptr<CWallet>> GetWallets();
-std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::string& warning);
-WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::string& warning, std::shared_ptr<CWallet>& result);
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::vector<std::string>& warnings);
+WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::vector<std::string>& warnings, std::shared_ptr<CWallet>& result);
 
 namespace interfaces {
 
@@ -253,14 +253,14 @@ public:
         }
         return wallets;
     }
-    std::unique_ptr<Wallet> loadWallet(const std::string& name, std::string& error, std::string& warning) override
+    std::unique_ptr<Wallet> loadWallet(const std::string& name, std::string& error, std::vector<std::string>& warnings) override
     {
-        return MakeWallet(LoadWallet(*m_interfaces.chain, name, error, warning));
+        return MakeWallet(LoadWallet(*m_interfaces.chain, name, error, warnings));
     }
-    WalletCreationStatus createWallet(const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::string& warning, std::unique_ptr<Wallet>& result) override
+    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::shared_ptr<CWallet> wallet;
-        WalletCreationStatus status = CreateWallet(*m_interfaces.chain, passphrase, wallet_creation_flags, name, error, warning, wallet);
+        WalletCreationStatus status = CreateWallet(*m_interfaces.chain, passphrase, wallet_creation_flags, name, error, warnings, wallet);
         result = MakeWallet(wallet);
         return status;
     }
diff --git a/src/interfaces/node.h b/src/interfaces/node.h
index 688ff434ba..4ee467014c 100644
--- a/src/interfaces/node.h
+++ b/src/interfaces/node.h
@@ -200,10 +200,10 @@ public:
     //! Attempts to load a wallet from file or directory.
     //! The loaded wallet is also notified to handlers previously registered
     //! with handleLoadWallet.
-    virtual std::unique_ptr<Wallet> loadWallet(const std::string& name, std::string& error, std::string& warning) = 0;
+    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::string& warning, std::unique_ptr<Wallet>& result) = 0;
+    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;
 
     //! Register handler for init messages.
     using InitMessageFn = std::function<void(const std::string& message)>;
diff --git a/src/qt/walletcontroller.cpp b/src/qt/walletcontroller.cpp
index fa6f9f3f16..a7edf442e5 100644
--- a/src/qt/walletcontroller.cpp
+++ b/src/qt/walletcontroller.cpp
@@ -12,6 +12,7 @@
 
 #include <interfaces/handler.h>
 #include <interfaces/node.h>
+#include <util/string.h>
 
 #include <algorithm>
 
@@ -226,7 +227,7 @@ void CreateWalletActivity::finish()
     if (!m_error_message.empty()) {
         QMessageBox::critical(m_parent_widget, tr("Create wallet failed"), QString::fromStdString(m_error_message));
     } else if (!m_warning_message.empty()) {
-        QMessageBox::warning(m_parent_widget, tr("Create wallet warning"), QString::fromStdString(m_warning_message));
+        QMessageBox::warning(m_parent_widget, tr("Create wallet warning"), QString::fromStdString(Join(m_warning_message, "\n")));
     }
 
     if (m_wallet_model) Q_EMIT created(m_wallet_model);
@@ -267,7 +268,7 @@ void OpenWalletActivity::finish()
     if (!m_error_message.empty()) {
         QMessageBox::critical(m_parent_widget, tr("Open wallet failed"), QString::fromStdString(m_error_message));
     } else if (!m_warning_message.empty()) {
-        QMessageBox::warning(m_parent_widget, tr("Open wallet warning"), QString::fromStdString(m_warning_message));
+        QMessageBox::warning(m_parent_widget, tr("Open wallet warning"), QString::fromStdString(Join(m_warning_message, "\n")));
     }
 
     if (m_wallet_model) Q_EMIT opened(m_wallet_model);
diff --git a/src/qt/walletcontroller.h b/src/qt/walletcontroller.h
index fb37b7292c..e50dd5c7eb 100644
--- a/src/qt/walletcontroller.h
+++ b/src/qt/walletcontroller.h
@@ -100,7 +100,7 @@ protected:
     QProgressDialog* m_progress_dialog{nullptr};
     WalletModel* m_wallet_model{nullptr};
     std::string m_error_message;
-    std::string m_warning_message;
+    std::vector<std::string> m_warning_message;
 };
 
 
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index 26aeb754ad..e48eee6c2c 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -412,7 +412,7 @@ bool BerkeleyBatch::VerifyEnvironment(const fs::path& file_path, std::string& er
     return true;
 }
 
-bool BerkeleyBatch::VerifyDatabaseFile(const fs::path& file_path, std::string& warningStr, std::string& errorStr, BerkeleyEnvironment::recoverFunc_type recoverFunc)
+bool BerkeleyBatch::VerifyDatabaseFile(const fs::path& file_path, std::vector<std::string>& warnings, std::string& errorStr, BerkeleyEnvironment::recoverFunc_type recoverFunc)
 {
     std::string walletFile;
     std::shared_ptr<BerkeleyEnvironment> env = GetWalletEnv(file_path, walletFile);
@@ -424,11 +424,11 @@ bool BerkeleyBatch::VerifyDatabaseFile(const fs::path& file_path, std::string& w
         BerkeleyEnvironment::VerifyResult r = env->Verify(walletFile, recoverFunc, backup_filename);
         if (r == BerkeleyEnvironment::VerifyResult::RECOVER_OK)
         {
-            warningStr = strprintf(_("Warning: Wallet file corrupt, data salvaged!"
+            warnings.push_back(strprintf(_("Warning: Wallet file corrupt, data salvaged!"
                                      " Original %s saved as %s in %s; if"
                                      " your balance or transactions are incorrect you should"
                                      " restore from a backup.").translated,
-                                   walletFile, backup_filename, walletDir);
+                walletFile, backup_filename, walletDir));
         }
         if (r == BerkeleyEnvironment::VerifyResult::RECOVER_FAIL)
         {
diff --git a/src/wallet/db.h b/src/wallet/db.h
index d9d2070cfc..abec3ae4e2 100644
--- a/src/wallet/db.h
+++ b/src/wallet/db.h
@@ -244,7 +244,7 @@ public:
     /* verifies the database environment */
     static bool VerifyEnvironment(const fs::path& file_path, std::string& errorStr);
     /* verifies the database file */
-    static bool VerifyDatabaseFile(const fs::path& file_path, std::string& warningStr, std::string& errorStr, BerkeleyEnvironment::recoverFunc_type recoverFunc);
+    static bool VerifyDatabaseFile(const fs::path& file_path, std::vector<std::string>& warnings, std::string& errorStr, BerkeleyEnvironment::recoverFunc_type recoverFunc);
 
     template <typename K, typename T>
     bool Read(const K& key, T& value)
diff --git a/src/wallet/load.cpp b/src/wallet/load.cpp
index b5d3b8c305..071befaebf 100644
--- a/src/wallet/load.cpp
+++ b/src/wallet/load.cpp
@@ -7,6 +7,7 @@
 
 #include <interfaces/chain.h>
 #include <scheduler.h>
+#include <util/string.h>
 #include <util/system.h>
 #include <util/translation.h>
 #include <wallet/wallet.h>
@@ -53,10 +54,10 @@ bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wal
         }
 
         std::string error_string;
-        std::string warning_string;
-        bool verify_success = CWallet::Verify(chain, location, salvage_wallet, error_string, warning_string);
+        std::vector<std::string> warnings;
+        bool verify_success = CWallet::Verify(chain, location, salvage_wallet, error_string, warnings);
         if (!error_string.empty()) chain.initError(error_string);
-        if (!warning_string.empty()) chain.initWarning(warning_string);
+        if (!warnings.empty()) chain.initWarning(Join(warnings, "\n"));
         if (!verify_success) return false;
     }
 
@@ -66,8 +67,12 @@ bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wal
 bool LoadWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files)
 {
     for (const std::string& walletFile : wallet_files) {
-        std::shared_ptr<CWallet> pwallet = CWallet::CreateWalletFromFile(chain, WalletLocation(walletFile));
+        std::string error;
+        std::vector<std::string> warnings;
+        std::shared_ptr<CWallet> pwallet = CWallet::CreateWalletFromFile(chain, WalletLocation(walletFile), error, warnings);
+        if (!warnings.empty()) chain.initWarning(Join(warnings, "\n"));
         if (!pwallet) {
+            chain.initError(error);
             return false;
         }
         AddWallet(pwallet);
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index c8dbbf8108..e159866921 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -21,6 +21,7 @@
 #include <util/bip32.h>
 #include <util/fees.h>
 #include <util/moneystr.h>
+#include <util/string.h>
 #include <util/system.h>
 #include <util/url.h>
 #include <util/validation.h>
@@ -2581,13 +2582,14 @@ static UniValue loadwallet(const JSONRPCRequest& request)
         }
     }
 
-    std::string error, warning;
+    std::string error;
+    std::vector<std::string> warning;
     std::shared_ptr<CWallet> const wallet = LoadWallet(*g_rpc_interfaces->chain, location, error, warning);
     if (!wallet) throw JSONRPCError(RPC_WALLET_ERROR, error);
 
     UniValue obj(UniValue::VOBJ);
     obj.pushKV("name", wallet->GetName());
-    obj.pushKV("warning", warning);
+    obj.pushKV("warning", Join(warning, "\n"));
 
     return obj;
 }
@@ -2693,12 +2695,12 @@ static UniValue createwallet(const JSONRPCRequest& request)
     }
     SecureString passphrase;
     passphrase.reserve(100);
-    std::string warning;
+    std::vector<std::string> warnings;
     if (!request.params[3].isNull()) {
         passphrase = request.params[3].get_str().c_str();
         if (passphrase.empty()) {
             // Empty string means unencrypted
-            warning = "Empty string given as passphrase, wallet will not be encrypted.";
+            warnings.emplace_back("Empty string given as passphrase, wallet will not be encrypted.");
         }
     }
 
@@ -2707,9 +2709,8 @@ static UniValue createwallet(const JSONRPCRequest& request)
     }
 
     std::string error;
-    std::string create_warning;
     std::shared_ptr<CWallet> wallet;
-    WalletCreationStatus status = CreateWallet(*g_rpc_interfaces->chain, passphrase, flags, request.params[0].get_str(), error, create_warning, wallet);
+    WalletCreationStatus status = CreateWallet(*g_rpc_interfaces->chain, passphrase, flags, request.params[0].get_str(), error, warnings, wallet);
     switch (status) {
         case WalletCreationStatus::CREATION_FAILED:
             throw JSONRPCError(RPC_WALLET_ERROR, error);
@@ -2720,15 +2721,9 @@ static UniValue createwallet(const JSONRPCRequest& request)
         // no default case, so the compiler can warn about missing cases
     }
 
-    if (warning.empty()) {
-        warning = create_warning;
-    } else if (!warning.empty() && !create_warning.empty()){
-        warning += "; " + create_warning;
-    }
-
     UniValue obj(UniValue::VOBJ);
     obj.pushKV("name", wallet->GetName());
-    obj.pushKV("warning", warning);
+    obj.pushKV("warning", Join(warnings, "\n"));
 
     return obj;
 }
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 4a97e41976..6adcf15167 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -138,16 +138,16 @@ void UnloadWallet(std::shared_ptr<CWallet>&& wallet)
     }
 }
 
-std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::string& warning)
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::vector<std::string>& warnings)
 {
-    if (!CWallet::Verify(chain, location, false, error, warning)) {
+    if (!CWallet::Verify(chain, location, false, error, warnings)) {
         error = "Wallet file verification failed: " + error;
         return nullptr;
     }
 
-    std::shared_ptr<CWallet> wallet = CWallet::CreateWalletFromFile(chain, location);
+    std::shared_ptr<CWallet> wallet = CWallet::CreateWalletFromFile(chain, location, error, warnings);
     if (!wallet) {
-        error = "Wallet loading failed.";
+        error = "Wallet loading failed: " + error;
         return nullptr;
     }
     AddWallet(wallet);
@@ -155,12 +155,12 @@ std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocati
     return wallet;
 }
 
-std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::string& warning)
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string& name, std::string& error, std::vector<std::string>& warnings)
 {
-    return LoadWallet(chain, WalletLocation(name), error, warning);
+    return LoadWallet(chain, WalletLocation(name), error, warnings);
 }
 
-WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::string& warning, std::shared_ptr<CWallet>& result)
+WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::vector<std::string>& warnings, std::shared_ptr<CWallet>& result)
 {
     // Indicate that the wallet is actually supposed to be blank and not just blank to make it encrypted
     bool create_blank = (wallet_creation_flags & WALLET_FLAG_BLANK_WALLET);
@@ -178,9 +178,8 @@ WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString&
     }
 
     // Wallet::Verify will check if we're trying to create a wallet with a duplicate name.
-    std::string wallet_error;
-    if (!CWallet::Verify(chain, location, false, wallet_error, warning)) {
-        error = "Wallet file verification failed: " + wallet_error;
+    if (!CWallet::Verify(chain, location, false, error, warnings)) {
+        error = "Wallet file verification failed: " + error;
         return WalletCreationStatus::CREATION_FAILED;
     }
 
@@ -191,9 +190,9 @@ WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString&
     }
 
     // Make the wallet
-    std::shared_ptr<CWallet> wallet = CWallet::CreateWalletFromFile(chain, location, wallet_creation_flags);
+    std::shared_ptr<CWallet> wallet = CWallet::CreateWalletFromFile(chain, location, error, warnings, wallet_creation_flags);
     if (!wallet) {
-        error = "Wallet creation failed";
+        error = "Wallet creation failed: " + error;
         return WalletCreationStatus::CREATION_FAILED;
     }
 
@@ -4182,7 +4181,7 @@ void CWallet::MarkPreSplitKeys()
     }
 }
 
-bool CWallet::Verify(interfaces::Chain& chain, const WalletLocation& location, bool salvage_wallet, std::string& error_string, std::string& warning_string)
+bool CWallet::Verify(interfaces::Chain& chain, const WalletLocation& location, bool salvage_wallet, std::string& error_string, std::vector<std::string>& warnings)
 {
     // Do some checking on wallet path. It should be either a:
     //
@@ -4236,10 +4235,10 @@ bool CWallet::Verify(interfaces::Chain& chain, const WalletLocation& location, b
         }
     }
 
-    return WalletBatch::VerifyDatabaseFile(wallet_path, warning_string, error_string);
+    return WalletBatch::VerifyDatabaseFile(wallet_path, warnings, error_string);
 }
 
-std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain, const WalletLocation& location, uint64_t wallet_creation_flags)
+std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::vector<std::string>& warnings, uint64_t wallet_creation_flags)
 {
     const std::string walletFile = WalletDataFilePath(location.GetPath()).string();
 
@@ -4252,7 +4251,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         std::unique_ptr<CWallet> tempWallet = MakeUnique<CWallet>(&chain, location, WalletDatabase::Create(location.GetPath()));
         DBErrors nZapWalletRet = tempWallet->ZapWalletTx(vWtx);
         if (nZapWalletRet != DBErrors::LOAD_OK) {
-            chain.initError(strprintf(_("Error loading %s: Wallet corrupted").translated, walletFile));
+            error = strprintf(_("Error loading %s: Wallet corrupted").translated, walletFile);
             return nullptr;
         }
     }
@@ -4265,29 +4264,28 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     // should be possible to use std::allocate_shared.
     std::shared_ptr<CWallet> walletInstance(new CWallet(&chain, location, WalletDatabase::Create(location.GetPath())), ReleaseWallet);
     DBErrors nLoadWalletRet = walletInstance->LoadWallet(fFirstRun);
-    if (nLoadWalletRet != DBErrors::LOAD_OK)
-    {
+    if (nLoadWalletRet != DBErrors::LOAD_OK) {
         if (nLoadWalletRet == DBErrors::CORRUPT) {
-            chain.initError(strprintf(_("Error loading %s: Wallet corrupted").translated, walletFile));
+            error = strprintf(_("Error loading %s: Wallet corrupted").translated, walletFile);
             return nullptr;
         }
         else if (nLoadWalletRet == DBErrors::NONCRITICAL_ERROR)
         {
-            chain.initWarning(strprintf(_("Error reading %s! All keys read correctly, but transaction data"
+            warnings.push_back(strprintf(_("Error reading %s! All keys read correctly, but transaction data"
                                           " or address book entries might be missing or incorrect.").translated,
                 walletFile));
         }
         else if (nLoadWalletRet == DBErrors::TOO_NEW) {
-            chain.initError(strprintf(_("Error loading %s: Wallet requires newer version of %s").translated, walletFile, PACKAGE_NAME));
+            error = strprintf(_("Error loading %s: Wallet requires newer version of %s").translated, walletFile, PACKAGE_NAME);
             return nullptr;
         }
         else if (nLoadWalletRet == DBErrors::NEED_REWRITE)
         {
-            chain.initError(strprintf(_("Wallet needed to be rewritten: restart %s to complete").translated, PACKAGE_NAME));
+            error = strprintf(_("Wallet needed to be rewritten: restart %s to complete").translated, PACKAGE_NAME);
             return nullptr;
         }
         else {
-            chain.initError(strprintf(_("Error loading %s").translated, walletFile));
+            error = strprintf(_("Error loading %s").translated, walletFile);
             return nullptr;
         }
     }
@@ -4306,7 +4304,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
             walletInstance->WalletLogPrintf("Allowing wallet upgrade up to %i\n", nMaxVersion);
         if (nMaxVersion < walletInstance->GetVersion())
         {
-            chain.initError(_("Cannot downgrade wallet").translated);
+            error = _("Cannot downgrade wallet").translated;
             return nullptr;
         }
         walletInstance->SetMaxVersion(nMaxVersion);
@@ -4319,7 +4317,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         // Do not upgrade versions to any version between HD_SPLIT and FEATURE_PRE_SPLIT_KEYPOOL unless already supporting HD_SPLIT
         int max_version = walletInstance->GetVersion();
         if (!walletInstance->CanSupportFeature(FEATURE_HD_SPLIT) && max_version >= FEATURE_HD_SPLIT && max_version < FEATURE_PRE_SPLIT_KEYPOOL) {
-            chain.initError(_("Cannot upgrade a non HD split wallet without upgrading to support pre split keypool. Please use -upgradewallet=169900 or -upgradewallet with no version specified.").translated);
+            error = _("Cannot upgrade a non HD split wallet without upgrading to support pre split keypool. Please use -upgradewallet=169900 or -upgradewallet with no version specified.").translated;
             return nullptr;
         }
 
@@ -4347,7 +4345,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         // Regenerate the keypool if upgraded to HD
         if (hd_upgrade) {
             if (!walletInstance->TopUpKeyPool()) {
-                chain.initError(_("Unable to generate keys").translated);
+                error = _("Unable to generate keys").translated;
                 return nullptr;
             }
         }
@@ -4367,7 +4365,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
 
         // Top up the keypool
         if (walletInstance->CanGenerateKeys() && !walletInstance->TopUpKeyPool()) {
-            chain.initError(_("Unable to generate initial keys").translated);
+            error = _("Unable to generate initial keys").translated;
             return nullptr;
         }
 
@@ -4375,33 +4373,33 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         walletInstance->ChainStateFlushed(locked_chain->getTipLocator());
     } else if (wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS) {
         // Make it impossible to disable private keys after creation
-        chain.initError(strprintf(_("Error loading %s: Private keys can only be disabled during creation").translated, walletFile));
+        error = strprintf(_("Error loading %s: Private keys can only be disabled during creation").translated, walletFile);
         return NULL;
     } else if (walletInstance->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
         LOCK(walletInstance->cs_KeyStore);
         if (!walletInstance->mapKeys.empty() || !walletInstance->mapCryptedKeys.empty()) {
-            chain.initWarning(strprintf(_("Warning: Private keys detected in wallet {%s} with disabled private keys").translated, walletFile));
+            warnings.push_back(strprintf(_("Warning: Private keys detected in wallet {%s} with disabled private keys").translated, walletFile));
         }
     }
 
     if (!gArgs.GetArg("-addresstype", "").empty() && !ParseOutputType(gArgs.GetArg("-addresstype", ""), walletInstance->m_default_address_type)) {
-        chain.initError(strprintf(_("Unknown address type '%s'").translated, gArgs.GetArg("-addresstype", "")));
+        error = strprintf(_("Unknown address type '%s'").translated, gArgs.GetArg("-addresstype", ""));
         return nullptr;
     }
 
     if (!gArgs.GetArg("-changetype", "").empty() && !ParseOutputType(gArgs.GetArg("-changetype", ""), walletInstance->m_default_change_type)) {
-        chain.initError(strprintf(_("Unknown change type '%s'").translated, gArgs.GetArg("-changetype", "")));
+        error = strprintf(_("Unknown change type '%s'").translated, gArgs.GetArg("-changetype", ""));
         return nullptr;
     }
 
     if (gArgs.IsArgSet("-mintxfee")) {
         CAmount n = 0;
         if (!ParseMoney(gArgs.GetArg("-mintxfee", ""), n) || 0 == n) {
-            chain.initError(AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", "")).translated);
+            error = AmountErrMsg("mintxfee", gArgs.GetArg("-mintxfee", "")).translated;
             return nullptr;
         }
         if (n > HIGH_TX_FEE_PER_KB) {
-            chain.initWarning(AmountHighWarn("-mintxfee").translated + " " +
+            warnings.push_back(AmountHighWarn("-mintxfee").translated + " " +
                               _("This is the minimum transaction fee you pay on every transaction.").translated);
         }
         walletInstance->m_min_fee = CFeeRate(n);
@@ -4410,11 +4408,11 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     if (gArgs.IsArgSet("-fallbackfee")) {
         CAmount nFeePerK = 0;
         if (!ParseMoney(gArgs.GetArg("-fallbackfee", ""), nFeePerK)) {
-            chain.initError(strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'").translated, gArgs.GetArg("-fallbackfee", "")));
+            error = strprintf(_("Invalid amount for -fallbackfee=<amount>: '%s'").translated, gArgs.GetArg("-fallbackfee", ""));
             return nullptr;
         }
         if (nFeePerK > HIGH_TX_FEE_PER_KB) {
-            chain.initWarning(AmountHighWarn("-fallbackfee").translated + " " +
+            warnings.push_back(AmountHighWarn("-fallbackfee").translated + " " +
                               _("This is the transaction fee you may pay when fee estimates are not available.").translated);
         }
         walletInstance->m_fallback_fee = CFeeRate(nFeePerK);
@@ -4425,11 +4423,11 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     if (gArgs.IsArgSet("-discardfee")) {
         CAmount nFeePerK = 0;
         if (!ParseMoney(gArgs.GetArg("-discardfee", ""), nFeePerK)) {
-            chain.initError(strprintf(_("Invalid amount for -discardfee=<amount>: '%s'").translated, gArgs.GetArg("-discardfee", "")));
+            error = strprintf(_("Invalid amount for -discardfee=<amount>: '%s'").translated, gArgs.GetArg("-discardfee", ""));
             return nullptr;
         }
         if (nFeePerK > HIGH_TX_FEE_PER_KB) {
-            chain.initWarning(AmountHighWarn("-discardfee").translated + " " +
+            warnings.push_back(AmountHighWarn("-discardfee").translated + " " +
                               _("This is the transaction fee you may discard if change is smaller than dust at this level").translated);
         }
         walletInstance->m_discard_rate = CFeeRate(nFeePerK);
@@ -4437,41 +4435,40 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
     if (gArgs.IsArgSet("-paytxfee")) {
         CAmount nFeePerK = 0;
         if (!ParseMoney(gArgs.GetArg("-paytxfee", ""), nFeePerK)) {
-            chain.initError(AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", "")).translated);
+            error = AmountErrMsg("paytxfee", gArgs.GetArg("-paytxfee", "")).translated;
             return nullptr;
         }
         if (nFeePerK > HIGH_TX_FEE_PER_KB) {
-            chain.initWarning(AmountHighWarn("-paytxfee").translated + " " +
+            warnings.push_back(AmountHighWarn("-paytxfee").translated + " " +
                               _("This is the transaction fee you will pay if you send a transaction.").translated);
         }
         walletInstance->m_pay_tx_fee = CFeeRate(nFeePerK, 1000);
         if (walletInstance->m_pay_tx_fee < chain.relayMinFee()) {
-            chain.initError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)").translated,
-                gArgs.GetArg("-paytxfee", ""), chain.relayMinFee().ToString()));
+            error = strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)").translated,
+                gArgs.GetArg("-paytxfee", ""), chain.relayMinFee().ToString());
             return nullptr;
         }
     }
 
-    if (gArgs.IsArgSet("-maxtxfee"))
-    {
+    if (gArgs.IsArgSet("-maxtxfee")) {
         CAmount nMaxFee = 0;
         if (!ParseMoney(gArgs.GetArg("-maxtxfee", ""), nMaxFee)) {
-            chain.initError(AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", "")).translated);
+            error = AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", "")).translated;
             return nullptr;
         }
         if (nMaxFee > HIGH_MAX_TX_FEE) {
-            chain.initWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction.").translated);
+            warnings.push_back(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction.").translated);
         }
         if (CFeeRate(nMaxFee, 1000) < chain.relayMinFee()) {
-            chain.initError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)").translated,
-                                       gArgs.GetArg("-maxtxfee", ""), chain.relayMinFee().ToString()));
+            error = strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)").translated,
+                                       gArgs.GetArg("-maxtxfee", ""), chain.relayMinFee().ToString());
             return nullptr;
         }
         walletInstance->m_default_max_tx_fee = nMaxFee;
     }
 
     if (chain.relayMinFee().GetFeePerK() > HIGH_TX_FEE_PER_KB) {
-        chain.initWarning(AmountHighWarn("-minrelaytxfee").translated + " " +
+        warnings.push_back(AmountHighWarn("-minrelaytxfee").translated + " " +
                     _("The wallet will avoid paying less than the minimum relay fee.").translated);
     }
 
@@ -4521,7 +4518,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
             }
 
             if (rescan_height != block_height) {
-                chain.initError(_("Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex (download the whole blockchain again in case of pruned node)").translated);
+                error = _("Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex (download the whole blockchain again in case of pruned node)").translated;
                 return nullptr;
             }
         }
@@ -4540,7 +4537,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
         {
             WalletRescanReserver reserver(walletInstance.get());
             if (!reserver.reserve() || (ScanResult::SUCCESS != walletInstance->ScanForWalletTransactions(locked_chain->getBlockHash(rescan_height), {} /* stop block */, reserver, true /* update */).status)) {
-                chain.initError(_("Failed to rescan the wallet during initialization").translated);
+                error = _("Failed to rescan the wallet during initialization").translated;
                 return nullptr;
             }
         }
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index a1517a9db5..f9e2230a6f 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -47,7 +47,7 @@ bool RemoveWallet(const std::shared_ptr<CWallet>& wallet);
 bool HasWallets();
 std::vector<std::shared_ptr<CWallet>> GetWallets();
 std::shared_ptr<CWallet> GetWallet(const std::string& name);
-std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::string& warning);
+std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::vector<std::string>& warnings);
 
 enum class WalletCreationStatus {
     SUCCESS,
@@ -55,7 +55,7 @@ enum class WalletCreationStatus {
     ENCRYPTION_FAILED
 };
 
-WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::string& warning, std::shared_ptr<CWallet>& result);
+WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, std::string& error, std::vector<std::string>& warnings, std::shared_ptr<CWallet>& result);
 
 //! Default for -keypool
 static const unsigned int DEFAULT_KEYPOOL_SIZE = 1000;
@@ -1318,10 +1318,10 @@ public:
     bool MarkReplaced(const uint256& originalHash, const uint256& newHash);
 
     //! Verify wallet naming and perform salvage on the wallet if required
-    static bool Verify(interfaces::Chain& chain, const WalletLocation& location, bool salvage_wallet, std::string& error_string, std::string& warning_string);
+    static bool Verify(interfaces::Chain& chain, const WalletLocation& location, bool salvage_wallet, std::string& error_string, std::vector<std::string>& warnings);
 
     /* Initializes the wallet, returns a new CWallet instance or a null pointer in case of an error */
-    static std::shared_ptr<CWallet> CreateWalletFromFile(interfaces::Chain& chain, const WalletLocation& location, uint64_t wallet_creation_flags = 0);
+    static std::shared_ptr<CWallet> CreateWalletFromFile(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::vector<std::string>& warnings, uint64_t wallet_creation_flags = 0);
 
     /**
      * Wallet post-init setup
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 635997afc9..d7f7635a83 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -729,9 +729,9 @@ bool WalletBatch::VerifyEnvironment(const fs::path& wallet_path, std::string& er
     return BerkeleyBatch::VerifyEnvironment(wallet_path, errorStr);
 }
 
-bool WalletBatch::VerifyDatabaseFile(const fs::path& wallet_path, std::string& warningStr, std::string& errorStr)
+bool WalletBatch::VerifyDatabaseFile(const fs::path& wallet_path, std::vector<std::string>& warnings, std::string& errorStr)
 {
-    return BerkeleyBatch::VerifyDatabaseFile(wallet_path, warningStr, errorStr, WalletBatch::Recover);
+    return BerkeleyBatch::VerifyDatabaseFile(wallet_path, warnings, errorStr, WalletBatch::Recover);
 }
 
 bool WalletBatch::WriteDestData(const std::string &address, const std::string &key, const std::string &value)
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index 918dac9ecf..b1781d5ccf 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -260,7 +260,7 @@ public:
     /* verifies the database environment */
     static bool VerifyEnvironment(const fs::path& wallet_path, std::string& errorStr);
     /* verifies the database file */
-    static bool VerifyDatabaseFile(const fs::path& wallet_path, std::string& warningStr, std::string& errorStr);
+    static bool VerifyDatabaseFile(const fs::path& wallet_path, std::vector<std::string>& warnings, std::string& errorStr);
 
     //! write the hdchain model (external chain child index counter)
     bool WriteHDChain(const CHDChain& chain);