extensions/procfs/ProcFs.h

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 <unistd.h>

#include <map>
#include <vector>
#include <utility>
#include <string>
#include <optional>
#include <filesystem>
#include <memory>

#include "ProcessStat.h"
#include "MemInfo.h"
#include "CpuStat.h"
#include "NetDev.h"
#include "DiskStat.h"

#include "core/logging/LoggerFactory.h"
#include "core/logging/Logger.h"

namespace org::apache::nifi::minifi::extensions::procfs {

class ProcFs {
  static constexpr const char* DEFAULT_ROOT_PATH = "/proc";
  static constexpr const char* MEMINFO_FILE = "meminfo";
  static constexpr const char* STAT_FILE = "stat";
  static constexpr const char* NET_DEV_FILE = "net/dev";
  static constexpr const char* DISK_STATS_FILE = "diskstats";
 public:
  explicit ProcFs(std::filesystem::path path = DEFAULT_ROOT_PATH)
      : root_path_(std::move(path)) {
  }

  [[nodiscard]] std::map<pid_t, ProcessStat> getProcessStats() const;
  [[nodiscard]] std::vector<std::pair<std::string, CpuStatData>> getCpuStats() const;
  [[nodiscard]] std::vector<std::pair<std::string, NetDevData>> getNetDevs() const;
  [[nodiscard]] std::vector<std::pair<std::string, DiskStatData>> getDiskStats() const;
  [[nodiscard]] std::optional<MemInfo> getMemInfo() const;

 private:
  std::filesystem::path root_path_;
  uint64_t page_size_ = sysconf(_SC_PAGESIZE);
  std::shared_ptr<core::logging::Logger> logger_ = core::logging::LoggerFactory<ProcFs>::getLogger();
};


}  // namespace org::apache::nifi::minifi::extensions::procfs