[wallet] Use global g_wallet_init_interface to init/destroy the wallet.

This commit creates a global g_wallet_init_interface, which is created
in bitcoind and bitcoin-qt. g_wallet_init_interface is used to init
and destroy the wallet.

This removes the dependency from init.cpp on the wallet library.

5 files changed, 53 insertions, 42 deletions

diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index d3eb60725f..a849683eb0 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -18,6 +18,10 @@
 #include <httpserver.h>
 #include <httprpc.h>
 #include <utilstrencodings.h>
+#if ENABLE_WALLET
+#include <wallet/init.h>
+#include <walletinitinterface.h>
+#endif
 
 #include <boost/thread.hpp>
 
@@ -59,6 +63,10 @@ bool AppInit(int argc, char* argv[])
 {
     bool fRet = false;
 
+#if ENABLE_WALLET
+    g_wallet_init_interface.reset(new WalletInit);
+#endif
+
     //
     // Parameters
     //
diff --git a/src/init.cpp b/src/init.cpp
index 8397932951..cee1eeaf17 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -43,10 +43,8 @@
 #include <util.h>
 #include <utilmoneystr.h>
 #include <validationinterface.h>
-#ifdef ENABLE_WALLET
-#include <wallet/init.h>
-#endif
 #include <warnings.h>
+#include <walletinitinterface.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <memory>
@@ -74,6 +72,7 @@ static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;
 
 std::unique_ptr<CConnman> g_connman;
 std::unique_ptr<PeerLogicValidation> peerLogic;
+std::unique_ptr<WalletInitInterface> g_wallet_init_interface;
 
 #if ENABLE_ZMQ
 static CZMQNotificationInterface* pzmqNotificationInterface = nullptr;
@@ -189,9 +188,9 @@ void Shutdown()
     StopREST();
     StopRPC();
     StopHTTPServer();
-#ifdef ENABLE_WALLET
-    WalletInit::Flush();
-#endif
+    if (g_wallet_init_interface) {
+        g_wallet_init_interface->Flush();
+    }
     StopMapPort();
 
     // Because these depend on each-other, we make sure that neither can be
@@ -249,9 +248,9 @@ void Shutdown()
         pcoinsdbview.reset();
         pblocktree.reset();
     }
-#ifdef ENABLE_WALLET
-    WalletInit::Stop();
-#endif
+    if (g_wallet_init_interface) {
+        g_wallet_init_interface->Stop();
+    }
 
 #if ENABLE_ZMQ
     if (pzmqNotificationInterface) {
@@ -271,9 +270,10 @@ void Shutdown()
     UnregisterAllValidationInterfaces();
     GetMainSignals().UnregisterBackgroundSignalScheduler();
     GetMainSignals().UnregisterWithMempoolSignals(mempool);
-#ifdef ENABLE_WALLET
-    WalletInit::Close();
-#endif
+    if (g_wallet_init_interface) {
+        g_wallet_init_interface->Close();
+    }
+    g_wallet_init_interface.reset();
     globalVerifyHandle.reset();
     ECC_Stop();
     LogPrintf("%s: done\n", __func__);
@@ -415,9 +415,9 @@ 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"));
 
-#ifdef ENABLE_WALLET
-    strUsage += WalletInit::GetHelpString(showDebug);
-#endif
+    if (g_wallet_init_interface) {
+        strUsage += g_wallet_init_interface->GetHelpString(showDebug);
+    }
 
 #if ENABLE_ZMQ
     strUsage += HelpMessageGroup(_("ZeroMQ notification options:"));
@@ -1091,9 +1091,7 @@ bool AppInitParameterInteraction()
         return InitError(strprintf("acceptnonstdtxn is not currently supported for %s chain", chainparams.NetworkIDString()));
     nBytesPerSigOp = gArgs.GetArg("-bytespersigop", nBytesPerSigOp);
 
-#ifdef ENABLE_WALLET
-    if (!WalletInit::ParameterInteraction()) return false;
-#endif
+    if (g_wallet_init_interface && !g_wallet_init_interface->ParameterInteraction()) return false;
 
     fIsBareMultisigStd = gArgs.GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
     fAcceptDatacarrier = gArgs.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
@@ -1256,9 +1254,9 @@ bool AppInitMain()
      * available in the GUI RPC console even if external calls are disabled.
      */
     RegisterAllCoreRPCCommands(tableRPC);
-#ifdef ENABLE_WALLET
-    WalletInit::RegisterRPC(tableRPC);
-#endif
+    if (g_wallet_init_interface) {
+        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
@@ -1275,9 +1273,8 @@ bool AppInitMain()
     int64_t nStart;
 
     // ********************************************************* Step 5: verify wallet database integrity
-#ifdef ENABLE_WALLET
-    if (!WalletInit::Verify()) return false;
-#endif
+    if (g_wallet_init_interface && !g_wallet_init_interface->Verify()) return false;
+
     // ********************************************************* Step 6: network initialization
     // Note that we absolutely cannot open any actual connections
     // until the very end ("start node") as the UTXO/block state
@@ -1595,11 +1592,7 @@ bool AppInitMain()
     fFeeEstimatesInitialized = true;
 
     // ********************************************************* Step 8: load wallet
-#ifdef ENABLE_WALLET
-    if (!WalletInit::Open()) return false;
-#else
-    LogPrintf("No wallet support compiled in!\n");
-#endif
+    if (g_wallet_init_interface && !g_wallet_init_interface->Open()) return false;
 
     // ********************************************************* Step 9: data directory maintenance
 
@@ -1745,9 +1738,9 @@ bool AppInitMain()
     SetRPCWarmupFinished();
     uiInterface.InitMessage(_("Done loading"));
 
-#ifdef ENABLE_WALLET
-    WalletInit::Start(scheduler);
-#endif
+    if (g_wallet_init_interface) {
+        g_wallet_init_interface->Start(scheduler);
+    }
 
     return true;
 }
diff --git a/src/init.h b/src/init.h
index 33f97a55a5..11a37bef4e 100644
--- a/src/init.h
+++ b/src/init.h
@@ -6,11 +6,15 @@
 #ifndef BITCOIN_INIT_H
 #define BITCOIN_INIT_H
 
+#include <memory>
 #include <string>
 
 class CScheduler;
 class CWallet;
 
+class WalletInitInterface;
+extern std::unique_ptr<WalletInitInterface> g_wallet_init_interface;
+
 namespace boost
 {
 class thread_group;
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 06e1f1a37c..e6a2af5f6c 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -33,7 +33,9 @@
 #include <warnings.h>
 
 #ifdef ENABLE_WALLET
+#include <wallet/init.h>
 #include <wallet/wallet.h>
+#include <walletinitinterface.h>
 #endif
 
 #include <stdint.h>
@@ -669,6 +671,9 @@ int main(int argc, char *argv[])
     // Start up the payment server early, too, so impatient users that click on
     // bitcoin: links repeatedly have their payment requests routed to this process:
     app.createPaymentServer();
+
+    // Hook up the wallet init interface
+    g_wallet_init_interface.reset(new WalletInit);
 #endif
 
     /// 9. Main GUI initialization
diff --git a/src/wallet/init.h b/src/wallet/init.h
index e6c9ffb05b..f8be90d3e3 100644
--- a/src/wallet/init.h
+++ b/src/wallet/init.h
@@ -6,42 +6,43 @@
 #ifndef BITCOIN_WALLET_INIT_H
 #define BITCOIN_WALLET_INIT_H
 
+#include <walletinitinterface.h>
 #include <string>
 
 class CRPCTable;
 class CScheduler;
 
-class WalletInit {
+class WalletInit : public WalletInitInterface {
 public:
 
     //! Return the wallets help message.
-    static std::string GetHelpString(bool showDebug);
+    std::string GetHelpString(bool showDebug) override;
 
     //! Wallets parameter interaction
-    static bool ParameterInteraction();
+    bool ParameterInteraction() override;
 
     //! Register wallet RPCs.
-    static void RegisterRPC(CRPCTable &tableRPC);
+    void RegisterRPC(CRPCTable &tableRPC) 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).
-    static bool Verify();
+    bool Verify() override;
 
     //! Load wallet databases.
-    static bool Open();
+    bool Open() override;
 
     //! Complete startup of wallets.
-    static void Start(CScheduler& scheduler);
+    void Start(CScheduler& scheduler) override;
 
     //! Flush all wallets in preparation for shutdown.
-    static void Flush();
+    void Flush() override;
 
     //! Stop all wallets. Wallets will be flushed first.
-    static void Stop();
+    void Stop() override;
 
     //! Close all wallets.
-    static void Close();
+    void Close() override;
 };
 
 #endif // BITCOIN_WALLET_INIT_H