Merge #15454: Remove the automatic creation and loading of the default wallet

d26f0648f1 Tell users how to load or create a wallet when no wallet is loaded (Andrew Chow)
1bee1e6269 Do not create default wallet (Andrew Chow)

Pull request description:

  Instead of automatically creating and loading a default wallet, users should instead explicitly create their wallet or load it on start.

  Builds on #19754 which provides the `load_on_startup` behavior for the GUI.

ACKs for top commit:
  jnewbery:
    Manual test and very light code review ACK d26f0648f1
  ryanofsky:
    Code review ACK d26f0648f1. Just suggested changes to first commit (reusing MakeWalletDatabase and adding release notes), no changes to second commit
  jonatack:
    ACK d26f0648f1 light code review, debug build, ran tests, did manual testing with testnet, rebased on master, on linux debian.

Tree-SHA512: 091d785aef64736f7df661c576e815a87f3d029cfa32f3a75ba86fc25795f10b022ab3ae15c5b61a10b8cee16f5650f15cd79cbd6127e5e3ccbef631966d3c30

src/wallet/init.cpp

@@ -107,16 +107,7 @@ void WalletInit::Construct(NodeContext& node) const
         LogPrintf("Wallet disabled!\n");
         return;
     }
-    // If there's no -wallet setting with a list of wallets to load, set it to
-    // load the default "" wallet.
-    if (!args.IsArgSet("wallet")) {
-        args.LockSettings([&](util::Settings& settings) {
-            util::SettingsValue wallets(util::SettingsValue::VARR);
-            wallets.push_back(""); // Default wallet name is ""
-            settings.rw_settings["wallet"] = wallets;
-        });
-    }
-    auto wallet_client = interfaces::MakeWalletClient(*node.chain, args, args.GetArgs("-wallet"));
+    auto wallet_client = interfaces::MakeWalletClient(*node.chain, args);
     node.wallet_client = wallet_client.get();
     node.chain_clients.emplace_back(std::move(wallet_client));
 }

src/wallet/load.cpp

@@ -16,7 +16,7 @@
 
 #include <univalue.h>
 
-bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files)
+bool VerifyWallets(interfaces::Chain& chain)
 {
     if (gArgs.IsArgSet("-walletdir")) {
         fs::path wallet_dir = gArgs.GetArg("-walletdir", "");
@@ -41,10 +41,27 @@ bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wal
 
     chain.initMessage(_("Verifying wallet(s)...").translated);
 
+    // For backwards compatibility if an unnamed top level wallet exists in the
+    // wallets directory, include it in the default list of wallets to load.
+    if (!gArgs.IsArgSet("wallet")) {
+        DatabaseOptions options;
+        DatabaseStatus status;
+        bilingual_str error_string;
+        options.require_existing = true;
+        options.verify = false;
+        if (MakeWalletDatabase("", options, status, error_string)) {
+            gArgs.LockSettings([&](util::Settings& settings) {
+                util::SettingsValue wallets(util::SettingsValue::VARR);
+                wallets.push_back(""); // Default wallet name is ""
+                settings.rw_settings["wallet"] = wallets;
+            });
+        }
+    }
+
     // Keep track of each wallet absolute path to detect duplicates.
     std::set<fs::path> wallet_paths;
 
-    for (const auto& wallet_file : wallet_files) {
+    for (const auto& wallet_file : gArgs.GetArgs("-wallet")) {
         const fs::path path = fs::absolute(wallet_file, GetWalletDir());
 
         if (!wallet_paths.insert(path).second) {
@@ -65,10 +82,10 @@ bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wal
     return true;
 }
 
-bool LoadWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files)
+bool LoadWallets(interfaces::Chain& chain)
 {
     try {
-        for (const std::string& name : wallet_files) {
+        for (const std::string& name : gArgs.GetArgs("-wallet")) {
             DatabaseOptions options;
             DatabaseStatus status;
             options.verify = false; // No need to verify, assuming verified earlier in VerifyWallets()

src/wallet/load.h

@@ -17,10 +17,10 @@ class Chain;
 } // namespace interfaces
 
 //! Responsible for reading and validating the -wallet arguments and verifying the wallet database.
-bool VerifyWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files);
+bool VerifyWallets(interfaces::Chain& chain);
 
 //! Load wallet databases.
-bool LoadWallets(interfaces::Chain& chain, const std::vector<std::string>& wallet_files);
+bool LoadWallets(interfaces::Chain& chain);
 
 //! Complete startup of wallets.
 void StartWallets(CScheduler& scheduler, const ArgsManager& args);

src/wallet/test/init_test_fixture.cpp

@@ -10,7 +10,7 @@
 
 InitWalletDirTestingSetup::InitWalletDirTestingSetup(const std::string& chainName) : BasicTestingSetup(chainName)
 {
-    m_wallet_client = MakeWalletClient(*m_chain, *Assert(m_node.args), {});
+    m_wallet_client = MakeWalletClient(*m_chain, *Assert(m_node.args));
 
     std::string sep;
     sep += fs::path::preferred_separator;

src/wallet/test/wallet_test_fixture.h

@@ -21,7 +21,7 @@ struct WalletTestingSetup : public TestingSetup {
     explicit WalletTestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
 
     std::unique_ptr<interfaces::Chain> m_chain = interfaces::MakeChain(m_node);
-    std::unique_ptr<interfaces::WalletClient> m_wallet_client = interfaces::MakeWalletClient(*m_chain, *Assert(m_node.args), {});
+    std::unique_ptr<interfaces::WalletClient> m_wallet_client = interfaces::MakeWalletClient(*m_chain, *Assert(m_node.args));
     CWallet m_wallet;
     std::unique_ptr<interfaces::Handler> m_chain_notifications_handler;
 };