topic.hpp

// include/sparkplug/topic.hpp
#pragma once
 
#include "detail/compat.hpp"
 
#include <string>
#include <string_view>
 
namespace sparkplug {
 
inline constexpr std::string_view NAMESPACE = "spBv1.0";
 
// Maximum length of a topic component (group/edge node/device id); longer
// values are rejected to keep attacker-controlled ids from bloating state.
inline constexpr size_t kMaxComponentLength = 128;
 
enum class MessageType {
  NBIRTH, 
  NDEATH, 
  DBIRTH, 
  DDEATH, 
  NDATA,  
  DDATA,  
  NCMD,   
  DCMD,   
  STATE   
};
 
struct Topic {
  std::string group_id;     
  MessageType message_type; 
  std::string edge_node_id; 
  std::string device_id;    
 
  [[nodiscard]] std::string to_string() const;
 
  [[nodiscard]] static stdx::expected<Topic, std::string>
  parse(std::string_view topic_str);
};
 
} // namespace sparkplug