logger.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "logger.hpp"

#include "logging.hpp"
#include "time.hpp"

#include <cinttypes>
#include <stdio.h>
#include <type_traits>

namespace ndn {
namespace util {

std::ostream&
operator<<(std::ostream& os, LogLevel level)
{
  switch (level) {
  case LogLevel::FATAL:
    return os << "FATAL";
  case LogLevel::NONE:
    return os << "NONE";
  case LogLevel::ERROR:
    return os << "ERROR";
  case LogLevel::WARN:
    return os << "WARN";
  case LogLevel::INFO:
    return os << "INFO";
  case LogLevel::DEBUG:
    return os << "DEBUG";
  case LogLevel::TRACE:
    return os << "TRACE";
  case LogLevel::ALL:
    return os << "ALL";
  }

  BOOST_THROW_EXCEPTION(std::invalid_argument("unknown log level " + to_string(static_cast<int>(level))));
}

LogLevel
parseLogLevel(const std::string& s)
{
  if (s == "FATAL")
    return LogLevel::FATAL;
  else if (s == "NONE")
    return LogLevel::NONE;
  else if (s == "ERROR")
    return LogLevel::ERROR;
  else if (s == "WARN")
    return LogLevel::WARN;
  else if (s == "INFO")
    return LogLevel::INFO;
  else if (s == "DEBUG")
    return LogLevel::DEBUG;
  else if (s == "TRACE")
    return LogLevel::TRACE;
  else if (s == "ALL")
    return LogLevel::ALL;

  BOOST_THROW_EXCEPTION(std::invalid_argument("unrecognized log level '" + s + "'"));
}

Logger::Logger(const std::string& name)
  : m_moduleName(name)
{
  this->setLevel(LogLevel::NONE);
  Logging::addLogger(*this);
}

std::ostream&
operator<<(std::ostream& os, const LoggerTimestamp&)
{
  using namespace ndn::time;

  static const microseconds::rep ONE_SECOND = 1000000;
  microseconds::rep usecs = duration_cast<microseconds>(
                            system_clock::now().time_since_epoch()).count();

  // 10 (whole seconds) + '.' + 6 (fraction) + '\0'
  char buffer[10 + 1 + 6 + 1];
  BOOST_ASSERT_MSG(usecs / ONE_SECOND <= 9999999999L,
                   "whole seconds cannot fit in 10 characters");

  static_assert(std::is_same<microseconds::rep, int_least64_t>::value,
                "PRIdLEAST64 is incompatible with microseconds::rep");
  // std::snprintf unavailable in some environments <https://redmine.named-data.net/issues/2299>
  snprintf(buffer, sizeof(buffer), "%" PRIdLEAST64 ".%06" PRIdLEAST64,
           usecs / ONE_SECOND, usecs % ONE_SECOND);

  return os << buffer;
}

} // namespace util
} // namespace ndn