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// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
#pragma once
#include <spdlog/sinks/base_sink.h>
#include <spdlog/details/null_mutex.h>
#include <spdlog/details/synchronous_factory.h>
#include <array>
#include <string>
#include <syslog.h>
namespace spdlog {
namespace sinks {
/**
* Sink that write to syslog using the `syscall()` library call.
*/
template<typename Mutex>
class syslog_sink : public base_sink<Mutex>
{
public:
syslog_sink(std::string ident, int syslog_option, int syslog_facility, bool enable_formatting)
: enable_formatting_{enable_formatting}
, syslog_levels_{{/* spdlog::level::trace */ LOG_DEBUG,
/* spdlog::level::debug */ LOG_DEBUG,
/* spdlog::level::info */ LOG_INFO,
/* spdlog::level::warn */ LOG_WARNING,
/* spdlog::level::err */ LOG_ERR,
/* spdlog::level::critical */ LOG_CRIT,
/* spdlog::level::off */ LOG_INFO}}
, ident_{std::move(ident)}
{
// set ident to be program name if empty
::openlog(ident_.empty() ? nullptr : ident_.c_str(), syslog_option, syslog_facility);
}
~syslog_sink() override
{
::closelog();
}
syslog_sink(const syslog_sink &) = delete;
syslog_sink &operator=(const syslog_sink &) = delete;
protected:
void sink_it_(const details::log_msg &msg) override
{
string_view_t payload;
memory_buf_t formatted;
if (enable_formatting_)
{
base_sink<Mutex>::formatter_->format(msg, formatted);
payload = string_view_t(formatted.data(), formatted.size());
}
else
{
payload = msg.payload;
}
size_t length = payload.size();
// limit to max int
if (length > static_cast<size_t>(std::numeric_limits<int>::max()))
{
length = static_cast<size_t>(std::numeric_limits<int>::max());
}
::syslog(syslog_prio_from_level(msg), "%.*s", static_cast<int>(length), payload.data());
}
void flush_() override {}
bool enable_formatting_ = false;
private:
using levels_array = std::array<int, 7>;
levels_array syslog_levels_;
// must store the ident because the man says openlog might use the pointer as
// is and not a string copy
const std::string ident_;
//
// Simply maps spdlog's log level to syslog priority level.
//
int syslog_prio_from_level(const details::log_msg &msg) const
{
return syslog_levels_.at(static_cast<levels_array::size_type>(msg.level));
}
};
using syslog_sink_mt = syslog_sink<std::mutex>;
using syslog_sink_st = syslog_sink<details::null_mutex>;
} // namespace sinks
// Create and register a syslog logger
template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> syslog_logger_mt(const std::string &logger_name, const std::string &syslog_ident = "", int syslog_option = 0,
int syslog_facility = LOG_USER, bool enable_formatting = false)
{
return Factory::template create<sinks::syslog_sink_mt>(logger_name, syslog_ident, syslog_option, syslog_facility, enable_formatting);
}
template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> syslog_logger_st(const std::string &logger_name, const std::string &syslog_ident = "", int syslog_option = 0,
int syslog_facility = LOG_USER, bool enable_formatting = false)
{
return Factory::template create<sinks::syslog_sink_st>(logger_name, syslog_ident, syslog_option, syslog_facility, enable_formatting);
}
} // namespace spdlog
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