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104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
// Copyright(c) 2019 ZVYAGIN.Alexander@gmail.com
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// Distributed under the MIT License (http://opensource.org/licenses/MIT)
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#pragma once
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#include <spdlog/sinks/base_sink.h>
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#include <spdlog/details/null_mutex.h>
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#include <spdlog/details/synchronous_factory.h>
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#include <array>
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#ifndef SD_JOURNAL_SUPPRESS_LOCATION
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#define SD_JOURNAL_SUPPRESS_LOCATION
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#endif
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#include <systemd/sd-journal.h>
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namespace spdlog {
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namespace sinks {
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/**
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* Sink that write to systemd journal using the `sd_journal_send()` library call.
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*
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* Locking is not needed, as `sd_journal_send()` itself is thread-safe.
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*/
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template<typename Mutex>
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class systemd_sink : public base_sink<Mutex>
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{
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public:
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//
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systemd_sink()
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: syslog_levels_{{/* spdlog::level::trace */ LOG_DEBUG,
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/* spdlog::level::debug */ LOG_DEBUG,
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/* spdlog::level::info */ LOG_INFO,
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/* spdlog::level::warn */ LOG_WARNING,
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/* spdlog::level::err */ LOG_ERR,
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/* spdlog::level::critical */ LOG_CRIT,
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/* spdlog::level::off */ LOG_INFO}}
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{}
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~systemd_sink() override {}
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systemd_sink(const systemd_sink &) = delete;
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systemd_sink &operator=(const systemd_sink &) = delete;
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protected:
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using levels_array = std::array<int, 7>;
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levels_array syslog_levels_;
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void sink_it_(const details::log_msg &msg) override
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{
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int err;
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size_t length = msg.payload.size();
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// limit to max int
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if (length > static_cast<size_t>(std::numeric_limits<int>::max()))
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{
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length = static_cast<size_t>(std::numeric_limits<int>::max());
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}
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// Do not send source location if not available
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if (msg.source.empty())
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{
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// Note: function call inside '()' to avoid macro expansion
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err = (sd_journal_send)("MESSAGE=%.*s", static_cast<int>(length), msg.payload.data(), "PRIORITY=%d", syslog_level(msg.level),
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"SYSLOG_IDENTIFIER=%.*s", static_cast<int>(msg.logger_name.size()), msg.logger_name.data(), nullptr);
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}
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else
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{
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err = (sd_journal_send)("MESSAGE=%.*s", static_cast<int>(length), msg.payload.data(), "PRIORITY=%d", syslog_level(msg.level),
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"SYSLOG_IDENTIFIER=%.*s", static_cast<int>(msg.logger_name.size()), msg.logger_name.data(), "CODE_FILE=%s",
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msg.source.filename, "CODE_LINE=%d", msg.source.line, "CODE_FUNC=%s", msg.source.funcname, nullptr);
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}
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if (err)
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{
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throw_spdlog_ex("Failed writing to systemd", errno);
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}
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}
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int syslog_level(level::level_enum l)
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{
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return syslog_levels_.at(static_cast<levels_array::size_type>(l));
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}
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void flush_() override {}
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};
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using systemd_sink_mt = systemd_sink<std::mutex>;
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using systemd_sink_st = systemd_sink<details::null_mutex>;
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} // namespace sinks
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// Create and register a syslog logger
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template<typename Factory = spdlog::synchronous_factory>
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inline std::shared_ptr<logger> systemd_logger_mt(const std::string &logger_name)
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{
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return Factory::template create<sinks::systemd_sink_mt>(logger_name);
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}
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template<typename Factory = spdlog::synchronous_factory>
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inline std::shared_ptr<logger> systemd_logger_st(const std::string &logger_name)
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{
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return Factory::template create<sinks::systemd_sink_st>(logger_name);
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}
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} // namespace spdlog
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