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// (C) 2013 Cybozu.
#include "logger.hpp"
#include "util.hpp"
#include <ctime>
#include <stdexcept>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <cerrno>
#include <cstddef>
namespace cybozu {
void logstream::add_prefix(const char* level) {
char buf[64];
std::time_t t = std::time(nullptr);
std::tm ct;
// beware that std::gmtime is not thread-safe.
std::strftime(buf, sizeof(buf), "%Y-%m-%d %T ", ::gmtime_r(&t, &ct));
*m_os << buf << level << " ";
}
void logstream::output() {
if( m_os.get() == nullptr ) return;
*m_os << "\n";
logger::instance().log(m_os->str());
m_os.reset(nullptr);
}
std::atomic<severity> logger::_threshold{ severity::info };
void logger::open_nolock(const std::string& path) {
if( m_fd != -1 && m_fd != STDERR_FILENO )
throw std::logic_error("<logger::open> double open.");
m_fd = ::open(path.c_str(), O_WRONLY|O_APPEND|O_CREAT, 0644);
if( m_fd == -1 ) {
m_fd = STDERR_FILENO;
throw_unix_error(errno, ("open(" + path + ")").c_str());
}
}
void logger::log(const std::string& msg) {
lock_guard g(m_lock);
std::size_t to_write = msg.size();
const char* ptr = msg.data();
while( to_write != 0 ) {
ssize_t n = ::write(m_fd, ptr, to_write);
if( n == -1 ) {
if( errno == EAGAIN || errno == EINTR ) continue;
throw_unix_error(errno, "<logger::log> write");
}
ptr += n;
to_write -= n;
}
}
} // namespace cybozu
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