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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/details/null_mutex.h>
- #include <spdlog/details/synchronous_factory.h>
- #include <spdlog/sinks/base_sink.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;
- //
- // 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));
- }
- 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_;
- };
- 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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