MonLogger.h

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// Copyright CERN and copyright holders of ALICE O2. This software is
// distributed under the terms of the GNU General Public License v3 (GPL
// Version 3), copied verbatim in the file "COPYING".
//
// See http://alice-o2.web.cern.ch/license for full licensing information.
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.


#ifndef MONITORING_MONINFOLOGGER_H
#define MONITORING_MONINFOLOGGER_H

#include <chrono>
#include <iomanip>
#include <iostream>

namespace o2
{
namespace monitoring
{

enum class Severity { Error = 31,
                      Warn = 33,
                      Info = 49 };

class MonLogger
{
 public:
  template <typename T>
  MonLogger& operator<<(const T& log)
  {
    mStream << log;
    return *this;
  }

  static MonLogger& Get(Severity severity = Severity::Info)
  {
    static MonLogger loggerInstance;
    loggerInstance.setDate();
    loggerInstance.setSeverity(severity);
    return loggerInstance;
  }

  static auto End() -> decltype("\033[0m\n")
  {
    return "\033[0m\n";
  }

 private:
  std::ostream& mStream;

  MonLogger(std::ostream& oStream = std::cout) : mStream(oStream)
  {
  }

  void setDate()
  {
    auto now = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
    mStream << std::put_time(std::localtime(&now), "%Y-%m-%d %X") << "\t";
  }

  void setSeverity(Severity severity)
  {
    mStream << "\033[1;" << static_cast<int>(severity) << "m";
  }

  MonLogger& operator=(const MonLogger&) = delete;
  MonLogger(const MonLogger&) = delete;
  MonLogger(MonLogger&&) = delete;
  MonLogger& operator=(MonLogger&&) = delete;
};

} // namespace monitoring
} // namespace o2

#endif //MONITORING_MONINFOLOGGER_H