json_formatter.hpp

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#pragma once
 
 
#include <logman/listener_sink.hpp>
#include <logman/log_event.hpp>
#include <logman/log_event_json.hpp>
 
#include <nlohmann/json.hpp>
#include <spdlog/details/fmt_helper.h>
#include <spdlog/details/log_msg.h>
#include <spdlog/formatter.h>
#include <spdlog/pattern_formatter.h>
 
#include <memory>
#include <string>
 
namespace logman {
 
class JsonFormatter final : public spdlog::formatter {
public:
    JsonFormatter() : message_formatter_("%v", spdlog::pattern_time_type::local, std::string{}) {}
 
    void format(const spdlog::details::log_msg& msg, spdlog::memory_buf_t& dest) override {
        spdlog::memory_buf_t message_buf;
        message_formatter_.format(msg, message_buf);
        const LogEvent event =
            detail::make_log_event(msg, std::string_view(message_buf.data(), message_buf.size()));
 
        const nlohmann::json j = event;
        const std::string out = j.dump();
        spdlog::details::fmt_helper::append_string_view(out, dest);
        dest.push_back('\n');
    }
 
    [[nodiscard]] std::unique_ptr<spdlog::formatter> clone() const override {
        return std::make_unique<JsonFormatter>();
    }
 
private:
    spdlog::pattern_formatter message_formatter_;
};
 
}  // namespace logman