log.cc

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#include <fstream>
#include <iomanip>
#include <iostream>
 
#include "kernel/log.h"
 
#define HAS_UNCAUGHT_EXCEPTIONS 1
#include "third_party/date/date.h"
 
namespace vita
{
 
log::level log::reporting_level = log::lALL;
std::unique_ptr<std::ostream> log::stream = nullptr;
 
log::log() : os(), level_(lOUTPUT) {}
 
std::ostringstream &log::get(level l)
{
  level_ = std::min(lFATAL, l);
  return os;
}
 
log::~log()
{
  static const std::string tags[] =
  {
    "ALL", "DEBUG", "INFO", "", "WARNING", "ERROR", "FATAL", ""
  };
 
  if (stream)  // `stream`, if available, gets all the messages
  {
    const auto tp(std::chrono::system_clock::now());
    const date::year_month_day d(date::floor<date::days>(tp));
 
    *stream << date::format("%T", d) << '\t' << tags[level_] << '\t'
            << os.str() << std::endl;
  }
 
  if (level_ >= reporting_level)  // `cout` is selective
  {
    std::string tag;
    if (level_ != lOUTPUT)
      tag = "[" + tags[level_] + "] ";
 
    std::cout << tag << os.str() << std::endl;
  }
}
 
void log::setup_stream(const std::string &base)
{
  const auto tp(std::chrono::system_clock::now());
  const date::year_month_day d(date::floor<date::days>(tp));
 
  std::ostringstream fn;
  fn << base << date::format("_%j_%H_%M_%S", d) << ".log";
 
  stream = std::make_unique<std::ofstream>(fn.str());
}
 
}  // namespace vita