// 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