77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
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// SPDX-FileCopyrightText: Matteo Settenvini <matteo.settenvini@montecristosoftware.eu>
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// SPDX-License-Identifier: GPL-3.0-or-later
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#include "logger.hh"
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#include <cstdlib>
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#include <mutex>
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#include <limits>
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#include <sys/syslog.h>
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#include <syslog.h>
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namespace /* anonymous */ {
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auto get_log_priority() -> int {
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auto level = getenv("NSS_MALCONTENT_LOG_LEVEL");
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if (level != nullptr) {
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return atoi(level);
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}
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#ifdef NDEBUG
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return LOG_WARNING;
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#else
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return LOG_DEBUG;
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#endif
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}
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} // ~ namespace anonymous
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std::unique_ptr<malcontent::Logger> malcontent::Logger::_instance = nullptr;
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std::shared_mutex malcontent::Logger::_instance_mtx = {};
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auto malcontent::Logger::debug(const std::string_view& msg) -> void {
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instance().log(LOG_DEBUG, msg);
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}
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auto malcontent::Logger::info(const std::string_view& msg) -> void {
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instance().log(LOG_INFO, msg);
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}
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auto malcontent::Logger::warn(const std::string_view& msg) -> void {
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instance().log(LOG_WARNING, msg);
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}
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auto malcontent::Logger::error(const std::string_view& msg) -> void {
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instance().log(LOG_ERR, msg);
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}
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auto malcontent::Logger::instance() -> Logger& {
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{
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std::shared_lock lock { _instance_mtx };
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if (_instance) return *_instance;
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}
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// First invocation: construct lazily
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std::unique_lock lock { _instance_mtx };
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if (!_instance) {
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_instance = std::make_unique<Logger>();
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}
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return *_instance;
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}
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auto malcontent::Logger::log(int priority, std::string_view msg) -> void {
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if (priority <= _max_log_priority) {
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msg = msg.substr(0, std::numeric_limits<int>::max()); // clamp to avoid malicious overflows
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::syslog(priority, "%.*s", static_cast<int>(msg.length()), msg.data());
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}
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}
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malcontent::Logger::Logger()
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: _max_log_priority(get_log_priority())
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{
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::openlog("nss_malcontent", LOG_PID | LOG_CONS, LOG_AUTHPRIV);
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}
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malcontent::Logger::~Logger() noexcept {
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::closelog();
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}
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