Add unix socket listening mode

src/http_handler.hpp

@@ -19,6 +19,7 @@ enum class HttpRoute {
   GET_retention,
   DELETE_retention,
   GET_metrics,
+  GET_ok,
   NotFound
 };
 
@@ -38,7 +39,9 @@ struct HttpConnectionState {
   // Parse state
   bool headers_complete = false;
   bool message_complete = false;
+  bool connection_close = false; // Client requested connection close
   HttpRoute route = HttpRoute::NotFound;
+  std::string_view current_header_field; // Current header being parsed
 
   explicit HttpConnectionState(ArenaAllocator &arena);
 };
@@ -79,14 +82,17 @@ private:
   void handleDeleteRetention(Connection &conn,
                              const HttpConnectionState &state);
   void handleGetMetrics(Connection &conn, const HttpConnectionState &state);
+  void handleGetOk(Connection &conn, const HttpConnectionState &state);
   void handleNotFound(Connection &conn, const HttpConnectionState &state);
 
   // HTTP utilities
   static void sendResponse(Connection &conn, int status_code,
-                           std::string_view content_type,
-                           std::string_view body);
+                           std::string_view content_type, std::string_view body,
+                           bool close_connection = false);
   static void sendJsonResponse(Connection &conn, int status_code,
-                               std::string_view json);
+                               std::string_view json,
+                               bool close_connection = false);
   static void sendErrorResponse(Connection &conn, int status_code,
-                                std::string_view message);
+                                std::string_view message,
+                                bool close_connection = false);
 };