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17513a6dce
Previously, the logger name was effectively lost. There were two choices on how to add it: - Via a formatter, which would mean that `journalctl` would not be able to filter against that. That would be suboptimal. - As a "syslog identifier". This means that `journalctl` will, by default, stop showing the daemon's executable name and replace that via the logger name. The PID is still shown, and if one would like to go back to the previous behavior, it is still possible via `journalctl -o with-unit`. I think that the second option is strictly better than the first one. fixes #1289
105 lines
3.4 KiB
C++
105 lines
3.4 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)(
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"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(),
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"CODE_FILE=%s", 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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SPDLOG_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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