spdlog/include/spdlog/logger-inl.h

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

#pragma once

#ifndef SPDLOG_HEADER_ONLY
#include "spdlog/logger.h"
#endif

#include "spdlog/sinks/sink.h"
#include "spdlog/details/pattern_formatter.h"

namespace spdlog {

    // public methods
    SPDLOG_INLINE logger::logger(const logger &other):
            name_(other.name_),
            sinks_(other.sinks_),
            level_(other.level_.load(std::memory_order_relaxed)),
            flush_level_(other.flush_level_.load(std::memory_order_relaxed)),
            custom_err_handler_(other.custom_err_handler_)
    {
    }

    SPDLOG_INLINE logger::logger(logger &&other):
            name_(std::move(other.name_)),
            sinks_(std::move(other.sinks_)),
            level_(other.level_.load(std::memory_order_relaxed)),
            flush_level_(other.flush_level_.load(std::memory_order_relaxed)),
            custom_err_handler_(std::move(other.custom_err_handler_))
    {
    }


    SPDLOG_INLINE logger &logger::operator=(logger other)
    {
        this->swap(other);
        return *this;
    }

    SPDLOG_INLINE void logger::swap(spdlog::logger &other)
    {
        name_.swap(other.name_);
        sinks_.swap(other.sinks_);

        //swap level_
        auto tmp = other.level_.load();
        tmp = level_.exchange(tmp);
        other.level_.store(tmp);

        //swap flush level_
        tmp = other.flush_level_.load();
        tmp = flush_level_.exchange(tmp);
        other.flush_level_.store(tmp);

        custom_err_handler_.swap(other.custom_err_handler_);
    }


    SPDLOG_INLINE void swap(logger &a, logger &b)
    {
        a.swap(b);
    }

    void logger::log(source_loc loc, level::level_enum lvl, const char *msg)
    {
        if (!should_log(lvl))
        {
            return;
        }

        try
        {
            details::log_msg log_msg(loc, string_view_t(name_), lvl, string_view_t(msg));
            sink_it_(log_msg);
        }
        catch (const std::exception &ex)
        {
            err_handler_(ex.what());
        }
        catch (...)
        {
            err_handler_("Unknown exception in logger");
        }
    }

    SPDLOG_INLINE void logger::log(level::level_enum lvl, const char *msg)
    {
        log(source_loc{}, lvl, msg);
    }

    SPDLOG_INLINE bool logger::should_log(level::level_enum msg_level) const
    {
        return msg_level >= level_.load(std::memory_order_relaxed);
    }

    SPDLOG_INLINE void logger::set_level(level::level_enum log_level)
    {
        level_.store(log_level);
    }

    SPDLOG_INLINE level::level_enum logger::default_level()
    {
        return static_cast<level::level_enum>(SPDLOG_ACTIVE_LEVEL);
    }

    SPDLOG_INLINE level::level_enum logger::level() const
    {
        return static_cast<level::level_enum>(level_.load(std::memory_order_relaxed));
    }

    SPDLOG_INLINE const std::string &logger::name() const
    {
        return name_;
    }

    // set formatting for the sinks in this logger.
    // each sink will get a seperate instance of the formatter object.
    SPDLOG_INLINE void logger::set_formatter(std::unique_ptr<formatter> f)
    {
        for (auto it = sinks_.begin(); it != sinks_.end(); ++it)
        {
            if (std::next(it) == sinks_.end())
            {
                // last element - we can be move it.
                (*it)->set_formatter(std::move(f));
            }
            else
            {
                (*it)->set_formatter(f->clone());
            }
        }
    }

    SPDLOG_INLINE void logger::set_pattern(std::string pattern, pattern_time_type time_type)
    {
        auto new_formatter = details::make_unique<pattern_formatter>(std::move(pattern), time_type);
        set_formatter(std::move(new_formatter));
    }

    // flush functions
    SPDLOG_INLINE void logger::flush()
    {
        try
        {
            flush_();
        }
        catch (const std::exception &ex)
        {
            err_handler_(ex.what());
        }
        catch (...)
        {
            err_handler_("Unknown exception in logger");
        }
    }

    SPDLOG_INLINE void logger::flush_on(level::level_enum log_level)
    {
        flush_level_.store(log_level);
    }

    SPDLOG_INLINE level::level_enum logger::flush_level() const
    {
        return static_cast<level::level_enum>(flush_level_.load(std::memory_order_relaxed));
    }

// sinks
    SPDLOG_INLINE const std::vector<sink_ptr> &logger::sinks() const
    {
        return sinks_;
    }

    SPDLOG_INLINE std::vector<sink_ptr> &logger::sinks()
    {
        return sinks_;
    }

    // error handler
    SPDLOG_INLINE void logger::set_error_handler(err_handler handler)
    {
        custom_err_handler_ = handler;
    }

    // create new logger with same sinks and configuration.
    SPDLOG_INLINE std::shared_ptr<logger> logger::clone(std::string logger_name)
    {
        auto cloned = std::make_shared<logger>(*this);
        cloned->name_ = std::move(logger_name);
        return cloned;
    }

    // protected methods
    SPDLOG_INLINE void logger::sink_it_(details::log_msg &msg)
    {
        for (auto &sink : sinks_)
        {
            if (sink->should_log(msg.level))
            {
                sink->log(msg);
            }
        }

        if (should_flush_(msg))
        {
            flush_();
        }
    }

    SPDLOG_INLINE void logger::flush_()
    {
        for (auto &sink : sinks_)
        {
            sink->flush();
        }
    }

    SPDLOG_INLINE bool logger::should_flush_(const details::log_msg &msg)
    {
        auto flush_level = flush_level_.load(std::memory_order_relaxed);
        return (msg.level >= flush_level) && (msg.level != level::off);
    }

    SPDLOG_INLINE void logger::err_handler_(const std::string &msg)
    {
        if (custom_err_handler_)
        {
            custom_err_handler_(msg);
        }
        else
        {
            auto tm_time = details::os::localtime();
            char date_buf[64];
            std::strftime(date_buf, sizeof(date_buf), "%Y-%m-%d %H:%M:%S", &tm_time);
            fmt::print(stderr, "[*** LOG ERROR ***] [{}] [{}] {}\n", date_buf, name(), msg);
        }
    }
} // namespace spdlog