[Fix] Implement independent terminal sessions.

Closes #1

client/src/game_state.cpp

@@ -1,6 +1,7 @@
 #include <cstdio>
 #include <memory>
 #include <sstream>
+#include <string>
 #include <thread>
 #include <chrono>
 
@@ -25,9 +26,13 @@ void GameState::_init_desktop(void) {
   _desktop = std::make_unique<Desktop>(_screen_width, _screen_height, this); 
 
   auto term = std::make_unique<Terminal>(this);
+  term->set_session_id(_initial_session_id);
+
   auto term_window = std::make_unique<UIWindow>("Terminal", 100, 100, 800, 500);
+  UIWindow* window_ptr = term_window.get();
   term_window->set_content(std::move(term));
   _desktop->add_window(std::move(term_window));
+  _desktop->register_session(_initial_session_id, window_ptr);
 }
 
 void GameState::_run_server(void) {
@@ -52,7 +57,8 @@ GameState::GameState(void) :
     _screen_width(0),
     _screen_height(0),
     _is_single_player(false),
-    _show_debug_overlay(false) {_debug_overlay = std::make_unique<DebugOverlay>();}
+    _show_debug_overlay(false),
+    _initial_session_id(0) {_debug_overlay = std::make_unique<DebugOverlay>();}
 
 GameState::~GameState(void) = default;
 
@@ -170,6 +176,12 @@ void GameState::update(float dt, int draw_calls, int shape_verts, int text_verts
       switch(opcode) {
         case net_protocol::Opcode::S2C_LOGIN_SUCCESS:
         case net_protocol::Opcode::S2C_CREATE_ACCOUNT_SUCCESS:
+          /* Don't switch screen yet, wait for the session ID. */
+          break;
+        case net_protocol::Opcode::S2C_SESSION_CREATED:
+          if(!args.empty()) {
+            _initial_session_id = std::stoul(args[0]);
+          }
           _current_screen = Screen::BOOTING;
           _login_screen.reset(); /* Free mem. */
           _boot_sequence = std::make_unique<BootSequence>();
@@ -210,47 +222,67 @@ void GameState::update(float dt, int draw_calls, int shape_verts, int text_verts
       net_protocol::parse_message(server_msg, opcode, args);
 
       switch(opcode) {
+        case net_protocol::Opcode::S2C_SESSION_CREATED:
+          if(!args.empty()) {
+            uint32_t session_id = std::stoul(args[0]);
+            UIWindow* new_term = _desktop->get_window_awaiting_session_id();
+            if(new_term) {
+              Terminal* term = dynamic_cast<Terminal*>(new_term->get_content());
+              if(term) {
+                term->set_session_id(session_id);
+                _desktop->register_session(session_id, new_term);
+              }
+            }
+          }
+          break;
         case net_protocol::Opcode::S2C_FILE_DATA:
-          if(args.size() == 2) {
+          if(args.size() == 3) {
-            auto editor = std::make_unique<Editor>(args[0]);
+            uint32_t session_id = std::stoul(args[0]);
-            editor->set_buffer_content(args[1]);
+            auto editor = std::make_unique<Editor>(args[1]);
-            auto editor_window = std::make_unique<UIWindow>(args[0].c_str(),
+            editor->set_buffer_content(args[2]);
+            auto editor_window = std::make_unique<UIWindow>(args[1].c_str(),
                                                             200, 200, 600, 400);
             editor_window->set_content(std::move(editor));
             _desktop->add_window(std::move(editor_window));
           }
           break;
         case net_protocol::Opcode::S2C_DISCONNECT: {
-          IWindowContent* content = _desktop->get_focused_window() ?
+          if(!args.empty()) {
-              _desktop->get_focused_window()->get_content() : nullptr;
+            uint32_t session_id = std::stoul(args[0]);
-          Terminal* terminal = dynamic_cast<Terminal*>(content);
+            UIWindow* window = _desktop->get_window_by_session_id(session_id);
-
+            if(window) {
+              Terminal* terminal = dynamic_cast<Terminal*>(window->get_content());
               if(terminal) {
                 terminal->add_history("Connection closed.");
               }
             }
+          }
+        }
         break;
         case net_protocol::Opcode::S2C_CLOSE_WINDOW: {
-          if(_desktop) {
+          if(!args.empty()) {
-            UIWindow* focused_window = _desktop->get_focused_window();
+            uint32_t session_id = std::stoul(args[0]);
-            if(focused_window) { focused_window->close(); }
+            UIWindow* window = _desktop->get_window_by_session_id(session_id);
+            if(window) {
+              window->close();
+            }
           }
         }
         break;
         case net_protocol::Opcode::S2C_COMMAND_RESPONSE: {
-          if(!args.empty()) {
+          if(args.size() == 2) {
-            IWindowContent* content = _desktop->get_focused_window() ?
+            uint32_t session_id = std::stoul(args[0]);
-                _desktop->get_focused_window()->get_content() : nullptr;
+            UIWindow* window = _desktop->get_window_by_session_id(session_id);
-            Terminal* terminal = dynamic_cast<Terminal*>(content);
+            if(window) {
-            if(!terminal) continue;
+              Terminal* terminal = dynamic_cast<Terminal*>(window->get_content());
-
+              if(terminal) {
                 /* Server sends "output\nprompt", split them. */
-            size_t last_newline = args[0].find_last_of('\n');
+                size_t last_newline = args[1].find_last_of('\n');
                 if(last_newline != std::string::npos) {
-              std::string prompt = args[0].substr(last_newline+1);
+                  std::string prompt = args[1].substr(last_newline+1);
                   terminal->set_prompt(prompt);
 
-              std::string output = args[0].substr(0, last_newline);
+                  std::string output = args[1].substr(0, last_newline);
                   if(!output.empty()) {
                     /* Split multiline output and push each line to history. */
                     std::stringstream ss(output);
@@ -260,7 +292,9 @@ void GameState::update(float dt, int draw_calls, int shape_verts, int text_verts
                     }
                   }
                 } else {
-              terminal->add_history(args[0]);
+                  terminal->add_history(args[1]);
+                }
+              }
             }
           }
         }
@@ -275,13 +309,6 @@ void GameState::update(float dt, int draw_calls, int shape_verts, int text_verts
   }
 }
 
-void GameState::send_network_command(const std::string& command) {
-  if(_network && _network->is_connected()) {
-    _network->send(net_protocol::build_message(net_protocol::Opcode::C2S_COMMAND,
-                                               {command}));
-  }
-}
-
 void GameState::render(const RenderContext& context) {
   switch(_current_screen) {
   case Screen::MAIN_MENU:
@@ -311,12 +338,26 @@ void GameState::render(const RenderContext& context) {
   }
 }
 
-void GameState::send_file_write_request(const std::string& path, const std::string& content) {
+void GameState::send_network_command(uint32_t session_id, const std::string& command) {
-  _network->send(net_protocol::build_message(net_protocol::Opcode::C2S_WRITE_FILE,
+  if(_network && _network->is_connected()) {
-                                             {path, content}));
+    _network->send(net_protocol::build_message(net_protocol::Opcode::C2S_COMMAND,
+                                               {std::to_string(session_id), command}));
+  }
 }
 
-void GameState::send_file_read_request(const std::string& path) {
+void GameState::send_file_write_request(uint32_t session_id, const std::string& path,
-  _network->send(net_protocol::build_message(net_protocol::Opcode::C2S_READ_FILE,
+                                        const std::string& content) {
-                                             {path}));
+  _network->send(net_protocol::build_message(net_protocol::Opcode::C2S_WRITE_FILE,
+                                             {std::to_string(session_id), path, content}));
+}
+
+void GameState::send_file_read_request(uint32_t session_id, const std::string& path) {
+  _network->send(net_protocol::build_message(net_protocol::Opcode::C2S_READ_FILE,
+                                             {std::to_string(session_id), path}));
+}
+
+void GameState::send_create_session_request(void) {
+  if(_network && _network->is_connected()) {
+    _network->send(net_protocol::build_message(net_protocol::Opcode::C2S_CREATE_SESSION));
+  }
 }

client/src/game_state.h

@@ -33,9 +33,10 @@ public:
   void render(const RenderContext& context);
 
   /* Public network interface for UI components. */
-  void send_network_command(const std::string& command);
+  void send_network_command(uint32_t session_id, const std::string& command);
-  void send_file_write_request(const std::string& path, const std::string& content);
+  void send_file_write_request(uint32_t session_id, const std::string& path, const std::string& content);
-  void send_file_read_request(const std::string& path);
+  void send_file_read_request(uint32_t session_id, const std::string& path);
+  void send_create_session_request(void);
 
 private:
   std::unique_ptr<ClientNetwork>  _network;
@@ -49,8 +50,8 @@ private:
   int                             _screen_width;
   int                             _screen_height;
   bool                            _is_single_player;
+  uint32_t                        _initial_session_id;
 
   void _init_desktop(void);
-  void _send_network_command(const std::string& command);
   void _run_server(void);
 };

client/src/terminal.cpp

@@ -12,7 +12,8 @@
 
 Terminal::Terminal(GameState* game_state)
     : _game_state(game_state), _should_close(false), _command_history_index(0),
-      _scroll_offset(0), _prompt(""), _pending_action({ActionType::NONE}) {
+      _scroll_offset(0), _prompt(""), _pending_action({ActionType::NONE}),
+      _session_id(0) {
   _input_view = std::make_unique<TextView>(&_input_buffer, false, false);
 }
 
@@ -52,6 +53,14 @@ WindowAction Terminal::get_pending_action(void) {
   return action;
 }
 
+void Terminal::set_session_id(uint32_t id) {
+  _session_id = id;
+}
+
+uint32_t Terminal::get_session_id(void) const {
+  return _session_id;
+}
+
 void Terminal::_on_ret_press(void) {
   std::string command = _input_buffer.get_line(0);
   if(!command.empty()) {
@@ -79,7 +88,7 @@ void Terminal::_on_ret_press(void) {
   }
 
   _history.push_back(_prompt + "> " + command);
-  _game_state->send_network_command(command);
+  _game_state->send_network_command(_session_id, command);
 }
 
 void Terminal::handle_input(SDL_Event* event, int window_x, int window_y, int window_gl_y) {

client/src/terminal.h

@@ -26,6 +26,8 @@ public:
   void set_prompt(const std::string& prompt);
   bool should_close(void) override;
   WindowAction get_pending_action(void) override;
+  void set_session_id(uint32_t id);
+  uint32_t get_session_id(void) const;
 
 private:
   void _on_ret_press(void);
@@ -39,5 +41,6 @@ private:
   GameState* _game_state;
   TextBuffer _input_buffer;
   WindowAction _pending_action;
+  uint32_t _session_id;
   std::unique_ptr<TextView> _input_view;
 };

client/src/ui/desktop.cpp

@@ -30,6 +30,7 @@ Desktop::Desktop(int screen_width, int screen_height, GameState* game_state) {
   _taskbar = std::make_unique<Taskbar>(screen_width, screen_height);
   _game_state= game_state;
   _focused_window = nullptr;
+  _window_awaiting_session_id = nullptr;
   _launcher_is_open = false;
   _launcher = std::make_unique<Launcher>(5, 0, 200); /* Tmp y-coord. */
   int launcher_y = screen_height - _taskbar->get_height() - _launcher->get_height();
@@ -135,9 +136,11 @@ void Desktop::handle_event(SDL_Event* event, int screen_width, int screen_height
       if(app_to_launch == "Terminal") {
         auto term = std::make_unique<Terminal>(_game_state);
         auto term_window = std::make_unique<UIWindow>("Terminal", 150, 150, 800, 500);
+        _window_awaiting_session_id = term_window.get();
         term_window->set_content(std::move(term));
         add_window(std::move(term_window));
         _launcher_is_open = false;
+        _game_state->send_create_session_request();
       } else if(app_to_launch == "Editor") {
         auto editor = std::make_unique<Editor>();
         auto editor_window = std::make_unique<UIWindow>("Editor", 200, 200, 600, 400);
@@ -180,13 +183,21 @@ void Desktop::update(float dt, int screen_width, int screen_height) {
     IWindowContent* content = _focused_window->get_content();
     if(content) {
       WindowAction action = content->get_pending_action();
+      uint32_t session_id = 0;
+      if(auto term = dynamic_cast<Terminal*>(content)) {
+        session_id = term->get_session_id();
+      }
       switch(action.type) {
         case ActionType::WRITE_FILE: {
-          _game_state->send_file_write_request(action.payload1, action.payload2);
+          if(session_id != 0) {
+            _game_state->send_file_write_request(session_id, action.payload1, action.payload2);
+          }
           break;
         }
         case ActionType::READ_FILE: {
-          _game_state->send_file_read_request(action.payload1);
+          if(session_id != 0) {
+            _game_state->send_file_read_request(session_id, action.payload1);
+          }
           break;
         }
         default:
@@ -203,6 +214,16 @@ void Desktop::update(float dt, int screen_width, int screen_height) {
   _windows.erase(std::remove_if(_windows.begin(), _windows.end(),
                                 [this](const std::unique_ptr<UIWindow>& w) {
                                   if (w->should_close()) {
+                                    /* Also remove from session map. */
+                                    uint32_t session_to_remove = 0;
+                                    for(auto const& [sid, win] : _session_windows) {
+                                      if(win == w.get()) {
+                                        session_to_remove = sid;
+                                        break;
+                                      }
+                                    }
+                                    if(session_to_remove != 0)
+                                      _session_windows.erase(session_to_remove);
                                     _taskbar->remove_window(w.get());
                                     if (w.get() == _focused_window) {
                                       _focused_window = nullptr;
@@ -214,10 +235,28 @@ void Desktop::update(float dt, int screen_width, int screen_height) {
                  _windows.end());
 }
 
+void Desktop::register_session(uint32_t session_id, UIWindow* window) {
+  _session_windows[session_id] = window;
+  if(_window_awaiting_session_id == window) {
+    _window_awaiting_session_id = nullptr;
+  }
+}
+
+UIWindow* Desktop::get_window_by_session_id(uint32_t session_id) {
+  if(_session_windows.count(session_id)) {
+    return _session_windows.at(session_id);
+  }
+  return nullptr;
+}
+
 UIWindow* Desktop::get_focused_window(void) {
   return _focused_window;
 }
 
+UIWindow* Desktop::get_window_awaiting_session_id(void) {
+  return _window_awaiting_session_id;
+}
+
 void Desktop::render(const RenderContext& context) {
   /* Pass 1: Background. */
   context.ui_renderer->begin_text();

client/src/ui/desktop.h

@@ -2,6 +2,7 @@
 
 #include <memory>
 #include <vector>
+#include <map>
 #include <SDL3/SDL.h>
 
 #include "gfx/types.h"
@@ -31,7 +32,10 @@ public:
   void update(float dt, int screen_width, int screen_height);
   void render(const RenderContext& context);
 
+  void register_session(uint32_t session_id, UIWindow* window);
+  UIWindow* get_window_by_session_id(uint32_t session_id);
   UIWindow* get_focused_window(void);
+  UIWindow* get_window_awaiting_session_id(void);
 
 private:
   void _set_focused_window(UIWindow* window);
@@ -42,6 +46,8 @@ private:
   std::unique_ptr<Taskbar>      _taskbar;
   std::unique_ptr<Launcher>     _launcher;
   UIWindow*                     _focused_window;
+  UIWindow*                     _window_awaiting_session_id;
+  std::map<uint32_t, UIWindow*> _session_windows;
   GameState*                    _game_state;
   std::vector<ScrollingText>    _background_text;
   std::vector<std::string>      _snippets;

common/src/lua_api.cpp

@@ -4,17 +4,17 @@
 
 #include "i_network_bridge.h"
 #include "lua_api.h"
-#include "command_processor.h"
+#include "session.h"
 #include "machine.h"
 #include "vfs.h"
 
 namespace api {
 
-vfs_node* get_current_dir(CommandProcessor& context) {
+vfs_node* get_current_dir(Session& context) {
   return context.get_current_dir();
 }
 
-std::string rm(CommandProcessor& context, const std::string& filename) {
+std::string rm(Session& context, const std::string& filename) {
   vfs_node* current_dir = context.get_current_dir();
   auto it = current_dir->children.find(filename);
 
@@ -30,7 +30,7 @@ std::string rm(CommandProcessor& context, const std::string& filename) {
   return "";
 }
 
-std::string write_file(CommandProcessor& context, const std::string& filename,
+std::string write_file(Session& context, const std::string& filename,
                        const std::string& content) {
   vfs_node* current_dir = context.get_current_dir();
   auto it = current_dir->children.find(filename);
@@ -50,7 +50,7 @@ std::string write_file(CommandProcessor& context, const std::string& filename,
   return "";
 }
 
-std::string cd(CommandProcessor& context, const std::string& path) {
+std::string cd(Session& context, const std::string& path) {
   vfs_node* current_dir = context.get_current_dir();
 
   if(path == "..") {
@@ -68,7 +68,7 @@ std::string cd(CommandProcessor& context, const std::string& path) {
   return "";
 }
 
-std::string ls(CommandProcessor& context) {
+std::string ls(Session& context) {
   vfs_node* dir = context.get_current_dir();
   if(dir->type != DIR_NODE) {
     return "ls: not a directory";
@@ -85,7 +85,7 @@ std::string ls(CommandProcessor& context) {
   return ss.str();
 }
 
-std::string ssh(CommandProcessor& context, const std::string& ip) {
+std::string ssh(Session& context, const std::string& ip) {
   INetworkBridge* bridge = context.get_network_bridge();
   Machine* target_machine = bridge->get_machine_by_ip(ip);
 
@@ -97,7 +97,7 @@ std::string ssh(CommandProcessor& context, const std::string& ip) {
   }
 }
 
-std::string nmap(CommandProcessor& context, const std::string& ip) {
+std::string nmap(Session& context, const std::string& ip) {
   long long machine_id = context.get_machine_manager()->get_machine_id_by_ip(ip);
   if(machine_id == 0) {
     return "nmap: Could not resolve host: " + ip;
@@ -117,7 +117,7 @@ std::string nmap(CommandProcessor& context, const std::string& ip) {
   return ss.str();
 }
 
-std::string disconnect(CommandProcessor& context) {
+std::string disconnect(Session& context) {
   Machine* current_machine = context.get_session_machine();
   if(current_machine != context.get_home_machine()) {
     INetworkBridge* bridge = context.get_network_bridge();
@@ -127,7 +127,7 @@ std::string disconnect(CommandProcessor& context) {
   return "Connection closed.";
 }
 
-std::string close_terminal(CommandProcessor& context) {
+std::string close_terminal(Session& context) {
   return "__CLOSE_CONNECTION__";
 }
 
@@ -145,7 +145,7 @@ ScpPath parse_scp_path(const std::string& arg) {
   }
 }
 
-std::string scp(CommandProcessor& context, const std::string& source_arg,
+std::string scp(Session& context, const std::string& source_arg,
                 const std::string& dest_arg) {
   ScpPath source_path = parse_scp_path(source_arg);
   ScpPath dest_path = parse_scp_path(dest_arg);

common/src/lua_api.h

@@ -3,27 +3,27 @@
 #include <string>
 #include "vfs.h"
 
-class CommandProcessor;
+class Session;
 class NetworkManager;
 
 namespace api {
 
 /* FILESYSTEM ACTIONS. */
-vfs_node* get_current_dir(CommandProcessor& context);
+vfs_node* get_current_dir(Session& context);
-std::string rm(CommandProcessor& context, const std::string& filename);
+std::string rm(Session& context, const std::string& filename);
-std::string write_file(CommandProcessor& context, const std::string& filename,
+std::string write_file(Session& context, const std::string& filename,
                        const std::string& content);
-std::string ls(CommandProcessor& context);
+std::string ls(Session& context);
-std::string cd(CommandProcessor& context, const std::string& path);
+std::string cd(Session& context, const std::string& path);
-std::string scp(CommandProcessor& context, const std::string& source,
+std::string scp(Session& context, const std::string& source,
                 const std::string& destination);
 
 /* NETWORK ACTIONS. */
-std::string ssh(CommandProcessor& context, const std::string& ip);
+std::string ssh(Session& context, const std::string& ip);
-std::string nmap(CommandProcessor& context, const std::string& ip);
+std::string nmap(Session& context, const std::string& ip);
-std::string disconnect(CommandProcessor& context);
+std::string disconnect(Session& context);
 
 /* SYSTEM ACTIONS. */
-std::string close_terminal(CommandProcessor& context);
+std::string close_terminal(Session& context);
 
 } /* namespace api */

common/src/lua_processor.cpp

@@ -5,10 +5,10 @@
 
 #include "lua_processor.h"
 #include "lua_api.h"
-#include "command_processor.h"
+#include "session.h"
 #include "vfs.h"
 
-LuaProcessor::LuaProcessor(CommandProcessor& context) {
+LuaProcessor::LuaProcessor(Session& context) {
   _lua.open_libraries(sol::lib::base, sol::lib::string, sol::lib::io, sol::lib::table);
 
   /* Expose vfs_node struct members to Lua. */
@@ -19,7 +19,7 @@ LuaProcessor::LuaProcessor(CommandProcessor& context) {
                               "content",    &vfs_node::content);
 
   /* Expose CommandProcessor to Lua. DON'T ALLOW SCRIPTS TO CREATE IT THOUGH! */
-  _lua.new_usertype<CommandProcessor>("CommandProcessor", sol::no_constructor);
+  _lua.new_usertype<Session>("Session", sol::no_constructor);
 
   /* Create the 'bettola' API table. */
   sol::table bettola_api = _lua.create_named_table("bettola");
@@ -37,7 +37,7 @@ LuaProcessor::LuaProcessor(CommandProcessor& context) {
 
 LuaProcessor::~LuaProcessor(void) {}
 
-sol::object LuaProcessor::execute(const std::string& script, CommandProcessor& context,
+sol::object LuaProcessor::execute(const std::string& script, Session& context,
                                   const std::vector<std::string>& args, bool is_remote) {
   try {
     /* Pass C++ objects/points into the Lua env. */

common/src/lua_processor.h

@@ -5,15 +5,15 @@
 #include <vfs.h>
 #include <string>
 
-class CommandProcessor;
+class Session;
 
 class LuaProcessor {
 public:
-  LuaProcessor(CommandProcessor& context);
+  LuaProcessor(Session& context);
   ~LuaProcessor(void);
 
   /* Executes a string of lua code and returns result as a string. */
-  sol::object execute(const std::string& script, CommandProcessor& context,
+  sol::object execute(const std::string& script, Session& context,
                       const std::vector<std::string>& args, bool is_remote);
 private:
   sol::state _lua;

common/src/net/message_protocol.h

@@ -16,19 +16,21 @@ enum class Opcode : uint8_t {
   /* Client -> Server messages. */
   C2S_CREATE_ACCOUNT,
   C2S_LOGIN,
-  C2S_COMMAND,
+  C2S_CREATE_SESSION,
-  C2S_WRITE_FILE,
+  C2S_COMMAND,    /* args: [session_id, command] */
-  C2S_READ_FILE,
+  C2S_WRITE_FILE, /* args: [session_id, path, content] */
+  C2S_READ_FILE,  /* args: [session_id, path] */
 
   /* Server -> Client messages. */
   S2C_CREATE_ACCOUNT_SUCCESS,
   S2C_CREATE_ACCOUNT_FAIL,
   S2C_LOGIN_SUCCESS,
   S2C_LOGIN_FAIL,
-  S2C_COMMAND_RESPONSE,
+  S2C_SESSION_CREATED,    /* args: [session_id] */
-  S2C_FILE_DATA,
+  S2C_COMMAND_RESPONSE,   /* args: [session_id, response] */
-  S2C_DISCONNECT,
+  S2C_FILE_DATA,          /* args: [session_id, path, content] */
-  S2C_CLOSE_WINDOW,
+  S2C_DISCONNECT,         /* args: [session_id] */
+  S2C_CLOSE_WINDOW,       /* args: [session_id] */
 };
 
 /**

common/src/session.cpp

@@ -1,7 +1,7 @@
 #include <sol/types.hpp>
 #include <sstream>
 
-#include "command_processor.h"
+#include "session.h"
 #include "db/database_manager.h"
 #include "i_network_bridge.h"
 #include "lua_api.h"
@@ -22,7 +22,7 @@ vfs_node* find_node_by_id(vfs_node* root, long long id) {
   return nullptr;
 }
 
-CommandProcessor::CommandProcessor(Machine* home_machine,
+Session::Session(Machine* home_machine,
                  DatabaseManager* db_manager,
                  MachineManager* machine_manager,
                  INetworkBridge* network_bridge) :
@@ -35,40 +35,40 @@ CommandProcessor::CommandProcessor(Machine* home_machine,
   if(home_machine) _current_dir = home_machine->vfs_root;
 }
 
-CommandProcessor::~CommandProcessor(void) {
+Session::~Session(void) {
 }
 
-vfs_node* CommandProcessor::get_current_dir(void) {
+vfs_node* Session::get_current_dir(void) {
   return _current_dir;
 }
 
-Machine* CommandProcessor::get_home_machine(void)     { return _home_machine; }
+Machine* Session::get_home_machine(void)     { return _home_machine; }
-Machine* CommandProcessor::get_session_machine(void)  { return _session_machine; }
+Machine* Session::get_session_machine(void)  { return _session_machine; }
 
-DatabaseManager* CommandProcessor::get_db_manager(void) {
+DatabaseManager* Session::get_db_manager(void) {
   return _db_manager;
 }
 
-MachineManager* CommandProcessor::get_machine_manager(void) {
+MachineManager* Session::get_machine_manager(void) {
   return _machine_manager;
 }
 
-INetworkBridge* CommandProcessor::get_network_bridge(void) {
+INetworkBridge* Session::get_network_bridge(void) {
   return _network_bridge;
 }
 
-void CommandProcessor::set_current_dir(vfs_node* node) {
+void Session::set_current_dir(vfs_node* node) {
   _current_dir = node;
 }
 
-void CommandProcessor::set_session_machine(Machine* machine) {
+void Session::set_session_machine(Machine* machine) {
   _session_machine = machine;
   if(_session_machine) {
     _current_dir = _session_machine->vfs_root;
   }
 }
 
-std::string CommandProcessor::process_command(const std::string& command) {
+std::string Session::process_command(const std::string& command) {
   /*
    * Creating the Lua processor on-demand to ensure it exists on the same
    * thread that will execute the script.
@@ -113,11 +113,11 @@ std::string CommandProcessor::process_command(const std::string& command) {
   return "Unknown command: " + command_name + "\n";
 }
 
-std::string CommandProcessor::write_file(const std::string& path, const std::string& content) {
+std::string Session::write_file(const std::string& path, const std::string& content) {
   return api::write_file(*this, path, content);
 }
 
-std::string CommandProcessor::read_file(const std::string& path) {
+std::string Session::read_file(const std::string& path) {
   vfs_node* root = get_session_machine()->vfs_root;
   vfs_node* node = find_node_by_path(root, path);
   if(node && node->type == FILE_NODE) {

common/src/session.h

@@ -9,11 +9,11 @@
 
 class LuaProcessor;
 
-class CommandProcessor {
+class Session {
 public:
-  CommandProcessor(Machine* home_machine, DatabaseManager* db_manager,
+  Session(Machine* home_machine, DatabaseManager* db_manager,
                    MachineManager* machine_manager, INetworkBridge* network_bridge);
-  ~CommandProcessor(void);
+  ~Session(void);
 
   std::string process_command(const std::string& command);
   std::string write_file(const std::string& path, const std::string& content);

server/src/network_manager.cpp

@@ -2,6 +2,7 @@
 #include <exception>
 #include <functional>
 #include <memory>
+#include <string>
 
 #include "network_manager.h"
 #include "net/message_protocol.h"
@@ -9,7 +10,7 @@
 
 #include "asio/error_code.hpp"
 #include "asio/ip/tcp.hpp"
-#include "command_processor.h"
+#include "session.h"
 #include "player.h"
 #include "machine.h"
 #include "net/tcp_connection.h"
@@ -114,15 +115,17 @@ void NetworkManager::on_message(std::shared_ptr<net::TcpConnection> connection,
                                       _machine_manager.get_vfs_template())) {
             long long home_machine_id = _db_manager->players().get_home_machine_id(args[0]);
             Machine* home_machine = _get_or_load_machine(home_machine_id);
-          delete player->cmd_processor; /* Delete old command processor. */
-          player->cmd_processor = new CommandProcessor(home_machine, _db_manager.get(),
-                                                       &_machine_manager, this);
             player->state = PlayerState::ACTIVE;
+
+            /* Create first session for player. */
+            uint32_t session_id = _next_session_id++;
+            player->sessions[session_id] = std::make_unique<Session>(home_machine,
+                                                                     _db_manager.get(),
+                                                                     &_machine_manager, this);
+
             connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_CREATE_ACCOUNT_SUCCESS));
-          /* send initial prompt. */
+            connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_SESSION_CREATED,
-          std::string prompt = "\n" + get_full_path(player->cmd_processor->get_current_dir());
+                                                         {std::to_string(session_id)}));
-          connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_COMMAND_RESPONSE,
-                                                       {prompt}));
           } else {
             connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_CREATE_ACCOUNT_FAIL,
                                                           {"Username already exists."}));
@@ -134,15 +137,18 @@ void NetworkManager::on_message(std::shared_ptr<net::TcpConnection> connection,
           if(_db_manager->players().authenticate(args[0], args[1])) {
             long long home_machine_id = _db_manager->players().get_home_machine_id(args[0]);
             Machine* home_machine = _get_or_load_machine(home_machine_id);
-            delete player->cmd_processor; /* Delete old command processor. */
-            player->cmd_processor = new CommandProcessor(home_machine, _db_manager.get(),
-                                                         &_machine_manager, this);
             player->state = PlayerState::ACTIVE;
+
+            /* Create first session for player. */
+            uint32_t session_id = _next_session_id++;
+            player->sessions[session_id] = std::make_unique<Session>(home_machine,
+                                                                     _db_manager.get(),
+                                                                     &_machine_manager, this);
+
             connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_LOGIN_SUCCESS));
-            /* Send initial prompt. */
+            connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_SESSION_CREATED,
-            std::string prompt = "\n" + get_full_path(player->cmd_processor->get_current_dir());
+                                                         {std::to_string(session_id)}));
-            connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_COMMAND_RESPONSE,
+
-                                                        {prompt}));
           } else {
             connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_LOGIN_FAIL,
                                                         {"Invalid username or password."}));
@@ -159,36 +165,49 @@ void NetworkManager::on_message(std::shared_ptr<net::TcpConnection> connection,
   /* === PLAYER BECOMES ACTIVE HERE === */
 
   switch(opcode) {
+    case net_protocol::Opcode::C2S_CREATE_SESSION: {
+      uint32_t session_id = _next_session_id++;
+      /* Find player's home machine to init the session. */
+      Machine* home_machine = nullptr;
+      if(!player->sessions.empty()) {
+        home_machine = player->sessions.begin()->second->get_home_machine();
+      }
+      player->sessions[session_id] = std::make_unique<Session>(home_machine,
+                                                              _db_manager.get(),
+                                                              &_machine_manager, this);
+      connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_SESSION_CREATED,
+                       {std::to_string(session_id)}));
+      break;
+    }
     case net_protocol::Opcode::C2S_WRITE_FILE:
-      if(args.size() == 2) {
+      if(args.size() == 3) {
-        fprintf(stderr, "[Player %u] Write file: '%s'\n", player->id, args[0].c_str());
+        uint32_t session_id = std::stoul(args[0]);
-        player->cmd_processor->write_file(args[0], args[1]);
+        if(player->sessions.count(session_id)) {
-      /* Response not required for a file write. */
+          player->sessions.at(session_id)->write_file(args[1], args[2]);
+        }
       }
       break;
     case net_protocol::Opcode::C2S_READ_FILE:
-    if(!args.empty()) {
+      if(args.size() == 2) {
-      fprintf(stderr, "[Player %u] Read file: '%s'\n", player->id, args[0].c_str());
+        uint32_t session_id = std::stoul(args[0]);
-      std::string content = player->cmd_processor->read_file(args[0]);
+        if(player->sessions.count(session_id)) {
-      /* Send the content back to the client. */
+          std::string content = player->sessions.at(session_id)->read_file(args[1]);
           connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_FILE_DATA,
-                       {args[0], content}));
+                                                       {args[0], args[1], content}));
+        }
       }
       break;
     case net_protocol::Opcode::C2S_COMMAND:
-      if(!args.empty()) {
+      if(args.size() == 2) {
-        fprintf(stderr, "[Player %u] Command: '%s'\n", player->id, args[0].c_str());
+        uint32_t session_id = std::stoul(args[0]);
-        std::string response = player->cmd_processor->process_command(args[0]);
+        if(player->sessions.count(session_id)) {
-
+          Session* session = player->sessions.at(session_id).get();
-        if(response == "__CLOSE_CONNECTION__") {
+          std::string response = session->process_command(args[1]);
-          connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_CLOSE_WINDOW));
+          std::string new_prompt = get_full_path(session->get_current_dir());
-          return;
-        }
-        std::string new_prompt = get_full_path(player->cmd_processor->get_current_dir());
           response += "\n" + new_prompt;
-
           connection->send(net_protocol::build_message(net_protocol::Opcode::S2C_COMMAND_RESPONSE,
-                                                     {response}));
+                                                       {args[0], response}));
+        }
       }
       break;
     default:
@@ -202,17 +221,16 @@ void NetworkManager::on_disconnect(std::shared_ptr<net::TcpConnection> connectio
   uint32_t player_id = connection->get_id();
   Player* player = _players[player_id].get();
 
-  if(player && player->cmd_processor) {
+  if(player) {
-    Machine* home_machine = player->cmd_processor->get_home_machine();
+    for(auto const& [session_id, session] : player->sessions) {
-    Machine* session_machine = player->cmd_processor->get_session_machine();
+      Machine* home_machine = session->get_home_machine();
-
+      Machine* session_machine = session->get_session_machine();
-    if(home_machine) {
+      if(home_machine) { release_machine(home_machine->id); }
-      release_machine(home_machine->id);
-    }
       if(session_machine && session_machine != home_machine) {
         release_machine(session_machine->id);
       }
     }
+  }
 
   fprintf(stderr, "[Player %u] Disconnected.\n", player_id);
   _connections.erase(

server/src/network_manager.h

@@ -50,6 +50,7 @@ private:
   std::unordered_map<uint32_t, std::unique_ptr<Player>> _players;
   std::map<long long, CachedMachine> _active_machines;
   uint32_t _next_player_id  = 1;
+  uint32_t _next_session_id = 1;
 
   std::unique_ptr<DatabaseManager> _db_manager;
   MachineManager _machine_manager;

server/src/player.cpp

@@ -1,5 +1,5 @@
 #include "player.h"
-#include "command_processor.h"
+#include "session.h"
 #include "db/database_manager.h"
 #include "i_network_bridge.h"
 #include "machine.h"
@@ -9,12 +9,6 @@ Player::Player(uint32_t new_id, Machine* home_machine,
                MachineManager* machine_manager,
                INetworkBridge* network_bridge) :
     id(new_id),
-    state(PlayerState::AUTHENTICATING) {
+    state(PlayerState::AUTHENTICATING) {}
 
-  cmd_processor = new CommandProcessor(home_machine, db_manager, machine_manager,
+Player::~Player(void) {}
-                                       network_bridge);
-}
-
-Player::~Player(void) {
-  delete cmd_processor;
-}

server/src/player.h

@@ -1,9 +1,11 @@
 #pragma once
 
 #include <cstdint>
+#include <memory>
+#include <unordered_map>
 
 #include "db/database_manager.h"
-#include "command_processor.h"
+#include "session.h"
 #include "i_network_bridge.h"
 #include "machine.h"
 #include "machine_manager.h"
@@ -21,5 +23,7 @@ public:
 
   uint32_t id;
   PlayerState state;
-  CommandProcessor* cmd_processor; /* Manages the VFS state for the remote session. */
+
+  /* Map of session IDs to their respective session objects. */
+  std::unordered_map<uint32_t, std::unique_ptr<Session>> sessions;
 };