database_status_message Struct Reference

Server-initiated notification of database status. More...

#include <subscription_protocol.hpp>

Collaboration diagram for database_status_message:

Public Member Functions
std::vector< std::byte >	serialize () const
	Serialize notification to bytes.

Static Public Member Functions
static std::expected< database_status_message, error_code >	deserialize (std::span< const std::byte > data)
	Deserialize notification from bytes.

Public Attributes
bool	available
	Whether the database is available.
std::string	error_message
	Error message if unavailable, empty otherwise.
std::chrono::system_clock::time_point	timestamp
	Timestamp of when the status was checked (UTC).

Detailed Description

Server-initiated notification of database status.

This is a push message from the server to connected clients. It informs clients about database connectivity status.

Member Function Documentation

serialize()

std::vector< std::byte > serialize

(

)

const

Serialize notification to bytes.

Format:

• 1 byte: available (0 or 1)
• 2 bytes: error_message length
• N bytes: error_message (UTF-8)
• 8 bytes: timestamp (milliseconds since epoch, int64_t)