tdlight/tdutils/td/utils/FileLog.h

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once

#include "td/utils/common.h"
#include "td/utils/logging.h"
#include "td/utils/port/FileFd.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"

#include <atomic>

namespace td {

class FileLog final : public LogInterface {
  static constexpr int64 DEFAULT_ROTATE_THRESHOLD = 10 * (1 << 20);

 public:
  static Result<unique_ptr<LogInterface>> create(string path, int64 rotate_threshold = DEFAULT_ROTATE_THRESHOLD,
                                                 bool redirect_stderr = true);
  Status init(string path, int64 rotate_threshold = DEFAULT_ROTATE_THRESHOLD, bool redirect_stderr = true);

  Slice get_path() const;

  vector<string> get_file_paths() final;

  void set_rotate_threshold(int64 rotate_threshold);

  int64 get_rotate_threshold() const;

  bool get_redirect_stderr() const;

  void after_rotation() final;

  void lazy_rotate();

 private:
  FileFd fd_;
  string path_;
  int64 size_ = 0;
  int64 rotate_threshold_ = 0;
  bool redirect_stderr_ = false;
  std::atomic<bool> want_rotate_{false};

  void do_append(int log_level, CSlice slice) final;

  void do_after_rotation();
};

}  // namespace td