file_monitor_source.h

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/*
 * Copyright (C) 2026 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#pragma once
 
#include <stddef.h>
 
#include <functional>
#include <memory>
#include <string>
#include <string_view>
 
#include "cuttlefish/common/libs/fs/shared_fd.h"
#include "cuttlefish/host/commands/cvd/cli/commands/monitor/monitor_source.h"
#include "cuttlefish/io/io.h"
#include "cuttlefish/result/result_type.h"
 
namespace cuttlefish {
 
class FileMonitorSource : public MonitorSource {
 public:
  FileMonitorSource(
      std::string path, std::unique_ptr<ReaderSeeker> file_io,
      std::function<Result<std::string>(std::string_view)> colorize_line,
      std::function<Result<bool>(std::string_view)> filter_line);
  ~FileMonitorSource() override;
 
  MonitorOutput Report(size_t rows, size_t columns) override;
 
  SharedFD ReadyFd() override;
 
 private:
  std::string path_;
  std::unique_ptr<ReaderSeeker> file_io_;
  std::function<Result<std::string>(std::string_view)> colorize_line_;
  std::function<Result<bool>(std::string_view)> filter_line_;
  SharedFD inotify_fd_;
};
 
}  // namespace cuttlefish