robot/include/spdlog/sinks/callback_sink.h

// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)

#pragma once

#include <spdlog/details/null_mutex.h>
#include <spdlog/sinks/base_sink.h>
#include <spdlog/details/synchronous_factory.h>

#include <mutex>
#include <string>

namespace spdlog {

// callbacks type
typedef std::function<void(const details::log_msg &msg)> custom_log_callback;

namespace sinks {
/*
 * Trivial callback sink, gets a callback function and calls it on each log
 */
template<typename Mutex>
class callback_sink final : public base_sink<Mutex>
{
public:
    explicit callback_sink(const custom_log_callback &callback)
        : callback_{callback}
    {}

protected:
    void sink_it_(const details::log_msg &msg) override
    {
        callback_(msg);
    }
    void flush_() override{};

private:
    custom_log_callback callback_;
};

using callback_sink_mt = callback_sink<std::mutex>;
using callback_sink_st = callback_sink<details::null_mutex>;

} // namespace sinks

//
// factory functions
//
template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> callback_logger_mt(const std::string &logger_name, const custom_log_callback &callback)
{
    return Factory::template create<sinks::callback_sink_mt>(logger_name, callback);
}

template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> callback_logger_st(const std::string &logger_name, const custom_log_callback &callback)
{
    return Factory::template create<sinks::callback_sink_st>(logger_name, callback);
}

} // namespace spdlog