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#include <logger/logger.hpp>
#include <config/config.hpp>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
Logger::Logger(const int log_level):
log_level(log_level),
stream(std::cout.rdbuf()),
null_buffer{},
null_stream{&null_buffer}
{
#ifdef SYSTEMD_FOUND
if (!this->use_stdout())
return;
// See https://www.freedesktop.org/software/systemd/man/systemd.exec.html#%24JOURNAL_STREAM
const char* journal_stream = ::getenv("JOURNAL_STREAM");
if (journal_stream == nullptr)
return;
struct stat s{};
const int res = ::fstat(STDOUT_FILENO, &s);
if (res == -1)
return;
const auto stdout_stream = std::to_string(s.st_dev) + ":" + std::to_string(s.st_ino);
if (stdout_stream == journal_stream)
this->use_systemd = true;
#endif
}
Logger::Logger(const int log_level, const std::string& log_file):
log_level(log_level),
ofstream(log_file.data(), std::ios_base::app),
stream(ofstream.rdbuf()),
null_buffer{},
null_stream{&null_buffer}
{
}
std::unique_ptr<Logger>& Logger::instance()
{
static std::unique_ptr<Logger> instance;
if (!instance)
{
const std::string log_file = Config::get("log_file", "");
const int log_level = Config::get_int("log_level", 0);
if (log_file.empty())
instance = std::make_unique<Logger>(log_level);
else
instance = std::make_unique<Logger>(log_level, log_file);
}
return instance;
}
std::ostream& Logger::get_stream(const int lvl)
{
if (lvl >= this->log_level)
return this->stream;
return this->null_stream;
}
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