extract common behavior

include/providers/base_provider.hpp

@@ -95,6 +95,9 @@ protected:
     return fm_;
   }
 
+  [[nodiscard]] virtual auto get_used_drive_space_impl() const
+      -> std::uint64_t = 0;
+
   [[nodiscard]] virtual auto remove_directory_impl(const std::string &api_path)
       -> api_error = 0;
 
@@ -159,6 +162,8 @@ public:
 
   [[nodiscard]] auto get_total_item_count() const -> std::uint64_t override;
 
+  [[nodiscard]] auto get_used_drive_space() const -> std::uint64_t override;
+
   [[nodiscard]] auto is_file_writeable(const std::string &api_path) const
       -> bool override;
 

include/providers/s3/s3_provider.hpp

@@ -80,6 +80,9 @@ protected:
                                               directory_item_list &list) const
       -> api_error override;
 
+  [[nodiscard]] auto get_used_drive_space_impl() const
+      -> std::uint64_t override;
+
   [[nodiscard]] auto remove_directory_impl(const std::string &api_path)
       -> api_error override;
 
@@ -107,8 +110,6 @@ public:
     return provider_type::s3;
   }
 
-  [[nodiscard]] auto get_used_drive_space() const -> std::uint64_t override;
-
   [[nodiscard]] auto is_direct_only() const -> bool override { return false; }
 
   [[nodiscard]] auto is_directory(const std::string &api_path,

include/providers/sia/sia_provider.hpp

@@ -58,6 +58,9 @@ protected:
                                               directory_item_list &list) const
       -> api_error override;
 
+  [[nodiscard]] auto get_used_drive_space_impl() const
+      -> std::uint64_t override;
+
   [[nodiscard]] auto remove_directory_impl(const std::string &api_path)
       -> api_error override;
 
@@ -85,8 +88,6 @@ public:
 
   [[nodiscard]] auto get_total_drive_space() const -> std::uint64_t override;
 
-  [[nodiscard]] auto get_used_drive_space() const -> std::uint64_t override;
-
   [[nodiscard]] auto is_direct_only() const -> bool override { return false; }
 
   [[nodiscard]] auto is_directory(const std::string &api_path,