101 lines
2.8 KiB
C++
101 lines
2.8 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 <systemd/sd-journal.h>
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namespace spdlog {
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namespace sinks {
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inline int syslog_level(level::level_enum l)
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{
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switch (l)
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{
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case level::off:
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case level::trace:
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case level::debug:
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return LOG_DEBUG;
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case level::info:
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return LOG_INFO;
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case level::warn:
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return LOG_WARNING;
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case level::err:
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return LOG_ERR;
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case level::critical:
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return LOG_CRIT;
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default:
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throw std::invalid_argument("systemd_sink.h syslog_level()");
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}
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}
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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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explicit systemd_sink() {}
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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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void sink_it_(const details::log_msg &msg) override
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{
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const char* key_msg = "MESSAGE=%.*s";
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const char* key_prio = "PRIORITY=%d";
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const char* key_file = "CODE_FILE=%s";
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const char* key_line = "CODE_LINE=%d";
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const char* key_func = "CODE_FUNC=%s";
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if( !msg.source.filename || !msg.source.funcname || msg.source.line == 0 ) {
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// Do not send source location if not available
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key_file = nullptr;
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}
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// Note: function call inside '()' to avoid macro expansion
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int err = (sd_journal_send)(
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key_msg, static_cast<int>(msg.payload.size()), msg.payload.data(),
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key_prio, syslog_level(msg.level),
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key_file, msg.source.filename,
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key_line, msg.source.line,
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key_func, msg.source.funcname,
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nullptr);
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if( err ) {
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throw spdlog_ex("Failed writing to systemd");
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}
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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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