wallet rpc: Add close_wallet RPC

And close the current wallet automatically if necessary when opening another
wallet.

src/wallet/wallet_rpc_server.cpp

@@ -2678,8 +2678,20 @@ namespace tools
       er.message = "Failed to generate wallet";
       return false;
     }
+
     if (m_wallet)
+    {
+      try
+      {
+        m_wallet->store();
+      }
+      catch (const std::exception& e)
+      {
+        handle_rpc_exception(std::current_exception(), er, WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR);
+        return false;
+      }
       delete m_wallet;
+    }
     m_wallet = wal.release();
     return true;
   }
@@ -2736,12 +2748,42 @@ namespace tools
       er.message = "Failed to open wallet";
       return false;
     }
+
     if (m_wallet)
+    {
+      try
+      {
+        m_wallet->store();
+      }
+      catch (const std::exception& e)
+      {
+        handle_rpc_exception(std::current_exception(), er, WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR);
+        return false;
+      }
       delete m_wallet;
+    }
     m_wallet = wal.release();
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
+  bool wallet_rpc_server::on_close_wallet(const wallet_rpc::COMMAND_RPC_CLOSE_WALLET::request& req, wallet_rpc::COMMAND_RPC_CLOSE_WALLET::response& res, epee::json_rpc::error& er)
+  {
+    if (!m_wallet) return not_open(er);
+
+    try
+    {
+      m_wallet->store();
+    }
+    catch (const std::exception& e)
+    {
+      handle_rpc_exception(std::current_exception(), er, WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR);
+      return false;
+    }
+    delete m_wallet;
+    m_wallet = NULL;
+    return true;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
   bool wallet_rpc_server::on_change_wallet_password(const wallet_rpc::COMMAND_RPC_CHANGE_WALLET_PASSWORD::request& req, wallet_rpc::COMMAND_RPC_CHANGE_WALLET_PASSWORD::response& res, epee::json_rpc::error& er)
   {
     if (!m_wallet) return not_open(er);

src/wallet/wallet_rpc_server.h

@@ -133,6 +133,7 @@ namespace tools
         MAP_JON_RPC_WE("get_languages",      on_get_languages,      wallet_rpc::COMMAND_RPC_GET_LANGUAGES)
         MAP_JON_RPC_WE("create_wallet",      on_create_wallet,      wallet_rpc::COMMAND_RPC_CREATE_WALLET)
         MAP_JON_RPC_WE("open_wallet",        on_open_wallet,        wallet_rpc::COMMAND_RPC_OPEN_WALLET)
+        MAP_JON_RPC_WE("close_wallet",       on_close_wallet,       wallet_rpc::COMMAND_RPC_CLOSE_WALLET)
         MAP_JON_RPC_WE("change_wallet_password",        on_change_wallet_password,        wallet_rpc::COMMAND_RPC_CHANGE_WALLET_PASSWORD)
         MAP_JON_RPC_WE("is_multisig",        on_is_multisig,        wallet_rpc::COMMAND_RPC_IS_MULTISIG)
         MAP_JON_RPC_WE("prepare_multisig",   on_prepare_multisig,   wallet_rpc::COMMAND_RPC_PREPARE_MULTISIG)
@@ -209,6 +210,7 @@ namespace tools
       bool on_get_languages(const wallet_rpc::COMMAND_RPC_GET_LANGUAGES::request& req, wallet_rpc::COMMAND_RPC_GET_LANGUAGES::response& res, epee::json_rpc::error& er);
       bool on_create_wallet(const wallet_rpc::COMMAND_RPC_CREATE_WALLET::request& req, wallet_rpc::COMMAND_RPC_CREATE_WALLET::response& res, epee::json_rpc::error& er);
       bool on_open_wallet(const wallet_rpc::COMMAND_RPC_OPEN_WALLET::request& req, wallet_rpc::COMMAND_RPC_OPEN_WALLET::response& res, epee::json_rpc::error& er);
+      bool on_close_wallet(const wallet_rpc::COMMAND_RPC_CLOSE_WALLET::request& req, wallet_rpc::COMMAND_RPC_CLOSE_WALLET::response& res, epee::json_rpc::error& er);
       bool on_change_wallet_password(const wallet_rpc::COMMAND_RPC_CHANGE_WALLET_PASSWORD::request& req, wallet_rpc::COMMAND_RPC_CHANGE_WALLET_PASSWORD::response& res, epee::json_rpc::error& er);
       bool on_is_multisig(const wallet_rpc::COMMAND_RPC_IS_MULTISIG::request& req, wallet_rpc::COMMAND_RPC_IS_MULTISIG::response& res, epee::json_rpc::error& er);
       bool on_prepare_multisig(const wallet_rpc::COMMAND_RPC_PREPARE_MULTISIG::request& req, wallet_rpc::COMMAND_RPC_PREPARE_MULTISIG::response& res, epee::json_rpc::error& er);

src/wallet/wallet_rpc_server_commands_defs.h

@@ -1829,6 +1829,21 @@ namespace wallet_rpc
     };
   };
 
+  struct COMMAND_RPC_CLOSE_WALLET
+  {
+    struct request
+    {
+      BEGIN_KV_SERIALIZE_MAP()
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct response
+    {
+      BEGIN_KV_SERIALIZE_MAP()
+      END_KV_SERIALIZE_MAP()
+    };
+  };
+
   struct COMMAND_RPC_CHANGE_WALLET_PASSWORD
   {
     struct request