Implement the core of the login system

luprex/core/cpp/world.hpp

@@ -68,12 +68,13 @@ public:
     //
     int64_t id() { return plane_item_.id(); }
 
-    void be_a_player();
+    // void be_a_player();
     void update_plane_item();
 };
 
 class World {
 public:
+    
     // A lua intepreter with snapshot function.
     //
     LuaSnap lua_snap_;
@@ -99,8 +100,16 @@ public:
     // Serialized snapshot of world model.
     StreamBuffer snapshot_;
 
+    // Redirects.
+    //
+    using Redirects = std::map<int64_t, int64_t>;
+    Redirects redirects_;
+
     void run_scheduled_threads(int64_t clk);
     static void store_global_pointer(lua_State *L, World *w);
+
+    // Check if main thread has nothing on the stack
+    bool stack_is_clear() const { return lua_gettop(state()) == 0; }
 public:
     // Constructor.
     //
@@ -125,7 +134,7 @@ public:
     //
     // Get the lua interpreter associated with this world model.
     //
-    lua_State *state() { return lua_snap_.state(); }
+    lua_State *state() const { return lua_snap_.state(); }
 
     // get_near
     //
@@ -157,6 +166,18 @@ public:
     //
     void tangible_delete(lua_State *L, int64_t id);
     
+    // Create a login actor.
+    //
+    // Creates a tangible of class 'login' and returns its ID.
+    // This is used to create a temporary actor which is used during
+    // the login process.
+    //
+    int64_t create_login_actor();
+
+    // Fetch all redirects and clear the redirects table.
+    //
+    Redirects fetch_redirects();
+
     // Probe the 'interface' function of the specified sprite.
     //
     void update_gui(int64_t actor_id, int64_t place_id, Gui *gui);