Merge #12977: Refactor g_wallet_init_interface to const reference

6ec78f1 wallet: Refactor g_wallet_init_interface to const reference (João Barbosa)
1936125 wallet: Make WalletInitInterface members const (João Barbosa)

Pull request description:

Tree-SHA512: c382156a38d4c6beaa6c48f911d7b314542b9500d88724b2b3029dae4491cb1e60e10628f6632d1366818ccf343f494650b3171593b5450149544ba198f49bb5

4 files changed, 48 insertions, 50 deletions

diff --git a/src/init.cpp b/src/init.cpp
index abff5ec79d..e2ac1a00d1 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -76,19 +76,18 @@ std::unique_ptr<PeerLogicValidation> peerLogic;
 class DummyWalletInit : public WalletInitInterface {
 public:
 
-    std::string GetHelpString(bool showDebug) override {return std::string{};}
-    bool ParameterInteraction() override {return true;}
-    void RegisterRPC(CRPCTable &) override {}
-    bool Verify() override {return true;}
-    bool Open() override {LogPrintf("No wallet support compiled in!\n"); return true;}
-    void Start(CScheduler& scheduler) override {}
-    void Flush() override {}
-    void Stop() override {}
-    void Close() override {}
+    std::string GetHelpString(bool showDebug) const override {return std::string{};}
+    bool ParameterInteraction() const override {return true;}
+    void RegisterRPC(CRPCTable &) const override {}
+    bool Verify() const override {return true;}
+    bool Open() const override {LogPrintf("No wallet support compiled in!\n"); return true;}
+    void Start(CScheduler& scheduler) const override {}
+    void Flush() const override {}
+    void Stop() const override {}
+    void Close() const override {}
 };
 
-static DummyWalletInit g_dummy_wallet_init;
-WalletInitInterface* const g_wallet_init_interface = &g_dummy_wallet_init;
+const WalletInitInterface& g_wallet_init_interface = DummyWalletInit();
 #endif
 
 #if ENABLE_ZMQ
@@ -204,7 +203,7 @@ void Shutdown()
     StopREST();
     StopRPC();
     StopHTTPServer();
-    g_wallet_init_interface->Flush();
+    g_wallet_init_interface.Flush();
     StopMapPort();
 
     // Because these depend on each-other, we make sure that neither can be
@@ -262,7 +261,7 @@ void Shutdown()
         pcoinsdbview.reset();
         pblocktree.reset();
     }
-    g_wallet_init_interface->Stop();
+    g_wallet_init_interface.Stop();
 
 #if ENABLE_ZMQ
     if (pzmqNotificationInterface) {
@@ -282,7 +281,7 @@ void Shutdown()
     UnregisterAllValidationInterfaces();
     GetMainSignals().UnregisterBackgroundSignalScheduler();
     GetMainSignals().UnregisterWithMempoolSignals(mempool);
-    g_wallet_init_interface->Close();
+    g_wallet_init_interface.Close();
     globalVerifyHandle.reset();
     ECC_Stop();
     LogPrintf("%s: done\n", __func__);
@@ -425,7 +424,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-whitelist=<IP address or network>", _("Whitelist peers connecting from the given IP address (e.g. 1.2.3.4) or CIDR notated network (e.g. 1.2.3.0/24). Can be specified multiple times.") +
         " " + _("Whitelisted peers cannot be DoS banned and their transactions are always relayed, even if they are already in the mempool, useful e.g. for a gateway"));
 
-    strUsage += g_wallet_init_interface->GetHelpString(showDebug);
+    strUsage += g_wallet_init_interface.GetHelpString(showDebug);
 
 #if ENABLE_ZMQ
     strUsage += HelpMessageGroup(_("ZeroMQ notification options:"));
@@ -1098,7 +1097,7 @@ bool AppInitParameterInteraction()
         return InitError(strprintf("acceptnonstdtxn is not currently supported for %s chain", chainparams.NetworkIDString()));
     nBytesPerSigOp = gArgs.GetArg("-bytespersigop", nBytesPerSigOp);
 
-    if (!g_wallet_init_interface->ParameterInteraction()) return false;
+    if (!g_wallet_init_interface.ParameterInteraction()) return false;
 
     fIsBareMultisigStd = gArgs.GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
     fAcceptDatacarrier = gArgs.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
@@ -1264,7 +1263,7 @@ bool AppInitMain()
      * available in the GUI RPC console even if external calls are disabled.
      */
     RegisterAllCoreRPCCommands(tableRPC);
-    g_wallet_init_interface->RegisterRPC(tableRPC);
+    g_wallet_init_interface.RegisterRPC(tableRPC);
 
     /* Start the RPC server already.  It will be started in "warmup" mode
      * and not really process calls already (but it will signify connections
@@ -1281,7 +1280,7 @@ bool AppInitMain()
     int64_t nStart;
 
     // ********************************************************* Step 5: verify wallet database integrity
-    if (!g_wallet_init_interface->Verify()) return false;
+    if (!g_wallet_init_interface.Verify()) return false;
 
     // ********************************************************* Step 6: network initialization
     // Note that we absolutely cannot open any actual connections
@@ -1600,7 +1599,7 @@ bool AppInitMain()
     fFeeEstimatesInitialized = true;
 
     // ********************************************************* Step 8: load wallet
-    if (!g_wallet_init_interface->Open()) return false;
+    if (!g_wallet_init_interface.Open()) return false;
 
     // ********************************************************* Step 9: data directory maintenance
 
@@ -1746,7 +1745,7 @@ bool AppInitMain()
     SetRPCWarmupFinished();
     uiInterface.InitMessage(_("Done loading"));
 
-    g_wallet_init_interface->Start(scheduler);
+    g_wallet_init_interface.Start(scheduler);
 
     return true;
 }
diff --git a/src/init.h b/src/init.h
index 829c110112..000c8c95e4 100644
--- a/src/init.h
+++ b/src/init.h
@@ -13,7 +13,7 @@ class CScheduler;
 class CWallet;
 
 class WalletInitInterface;
-extern WalletInitInterface* const g_wallet_init_interface;
+extern const WalletInitInterface& g_wallet_init_interface;
 
 namespace boost
 {
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
index b6f4a0e1e1..2fd9aa1a6f 100644
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -18,39 +18,38 @@ class WalletInit : public WalletInitInterface {
 public:
 
     //! Return the wallets help message.
-    std::string GetHelpString(bool showDebug) override;
+    std::string GetHelpString(bool showDebug) const override;
 
     //! Wallets parameter interaction
-    bool ParameterInteraction() override;
+    bool ParameterInteraction() const override;
 
     //! Register wallet RPCs.
-    void RegisterRPC(CRPCTable &tableRPC) override;
+    void RegisterRPC(CRPCTable &tableRPC) const override;
 
     //! Responsible for reading and validating the -wallet arguments and verifying the wallet database.
     //  This function will perform salvage on the wallet if requested, as long as only one wallet is
     //  being loaded (WalletParameterInteraction forbids -salvagewallet, -zapwallettxes or -upgradewallet with multiwallet).
-    bool Verify() override;
+    bool Verify() const override;
 
     //! Load wallet databases.
-    bool Open() override;
+    bool Open() const override;
 
     //! Complete startup of wallets.
-    void Start(CScheduler& scheduler) override;
+    void Start(CScheduler& scheduler) const override;
 
     //! Flush all wallets in preparation for shutdown.
-    void Flush() override;
+    void Flush() const override;
 
     //! Stop all wallets. Wallets will be flushed first.
-    void Stop() override;
+    void Stop() const override;
 
     //! Close all wallets.
-    void Close() override;
+    void Close() const override;
 };
 
-static WalletInit g_wallet_init;
-WalletInitInterface* const g_wallet_init_interface = &g_wallet_init;
+const WalletInitInterface& g_wallet_init_interface = WalletInit();
 
-std::string WalletInit::GetHelpString(bool showDebug)
+std::string WalletInit::GetHelpString(bool showDebug) const
 {
     std::string strUsage = HelpMessageGroup(_("Wallet options:"));
     strUsage += HelpMessageOpt("-addresstype", strprintf("What type of addresses to use (\"legacy\", \"p2sh-segwit\", or \"bech32\", default: \"%s\")", FormatOutputType(DEFAULT_ADDRESS_TYPE)));
@@ -92,7 +91,7 @@ std::string WalletInit::GetHelpString(bool showDebug)
     return strUsage;
 }
 
-bool WalletInit::ParameterInteraction()
+bool WalletInit::ParameterInteraction() const
 {
     if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
         for (const std::string& wallet : gArgs.GetArgs("-wallet")) {
@@ -220,7 +219,7 @@ bool WalletInit::ParameterInteraction()
     return true;
 }
 
-void WalletInit::RegisterRPC(CRPCTable &t)
+void WalletInit::RegisterRPC(CRPCTable &t) const
 {
     if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
         return;
@@ -229,7 +228,7 @@ void WalletInit::RegisterRPC(CRPCTable &t)
     RegisterWalletRPCCommands(t);
 }
 
-bool WalletInit::Verify()
+bool WalletInit::Verify() const
 {
     if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
         return true;
@@ -304,7 +303,7 @@ bool WalletInit::Verify()
     return true;
 }
 
-bool WalletInit::Open()
+bool WalletInit::Open() const
 {
     if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
         LogPrintf("Wallet disabled!\n");
@@ -322,28 +321,28 @@ bool WalletInit::Open()
     return true;
 }
 
-void WalletInit::Start(CScheduler& scheduler)
+void WalletInit::Start(CScheduler& scheduler) const
 {
     for (CWalletRef pwallet : vpwallets) {
         pwallet->postInitProcess(scheduler);
     }
 }
 
-void WalletInit::Flush()
+void WalletInit::Flush() const
 {
     for (CWalletRef pwallet : vpwallets) {
         pwallet->Flush(false);
     }
 }
 
-void WalletInit::Stop()
+void WalletInit::Stop() const
 {
     for (CWalletRef pwallet : vpwallets) {
         pwallet->Flush(true);
     }
 }
 
-void WalletInit::Close()
+void WalletInit::Close() const
 {
     for (CWalletRef pwallet : vpwallets) {
         delete pwallet;
diff --git a/src/walletinitinterface.h b/src/walletinitinterface.h
index c7eee37ce5..5bfde6faaf 100644
--- a/src/walletinitinterface.h
+++ b/src/walletinitinterface.h
@@ -13,23 +13,23 @@ class CRPCTable;
 class WalletInitInterface {
 public:
     /** Get wallet help string */
-    virtual std::string GetHelpString(bool showDebug) = 0;
+    virtual std::string GetHelpString(bool showDebug) const = 0;
     /** Check wallet parameter interaction */
-    virtual bool ParameterInteraction() = 0;
+    virtual bool ParameterInteraction() const = 0;
     /** Register wallet RPC*/
-    virtual void RegisterRPC(CRPCTable &) = 0;
+    virtual void RegisterRPC(CRPCTable &) const = 0;
     /** Verify wallets */
-    virtual bool Verify() = 0;
+    virtual bool Verify() const = 0;
     /** Open wallets*/
-    virtual bool Open() = 0;
+    virtual bool Open() const = 0;
     /** Start wallets*/
-    virtual void Start(CScheduler& scheduler) = 0;
+    virtual void Start(CScheduler& scheduler) const = 0;
     /** Flush Wallets*/
-    virtual void Flush() = 0;
+    virtual void Flush() const = 0;
     /** Stop Wallets*/
-    virtual void Stop() = 0;
+    virtual void Stop() const = 0;
     /** Close wallets */
-    virtual void Close() = 0;
+    virtual void Close() const = 0;
 
     virtual ~WalletInitInterface() {}
 };