(Sheriff created another revert)Revert of chromeos: Add CPU temperature reader

chromeos/system/cpu_temperature_reader.cc

Index: chromeos/system/cpu_temperature_reader.cc
diff --git a/chromeos/system/cpu_temperature_reader.cc b/chromeos/system/cpu_temperature_reader.cc
deleted file mode 100644
index 8a3e5c09cbf3aa0010ac85239bff3d41faab543a..0000000000000000000000000000000000000000
--- a/chromeos/system/cpu_temperature_reader.cc
+++ /dev/null
@@ -1,117 +0,0 @@
-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chromeos/system/cpu_temperature_reader.h"
-
-#include "base/files/file_enumerator.h"
-#include "base/files/file_path.h"
-#include "base/files/file_util.h"
-#include "base/location.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "base/task_scheduler/post_task.h"
-#include "base/task_scheduler/task_traits.h"
-
-namespace chromeos {
-namespace system {
-
-using CPUTemperatureInfo = CPUTemperatureReader::CPUTemperatureInfo;
-
-namespace {
-
-// The location we read our CPU temperature and channel label from.
-constexpr char kDefaultHwmonDir[] = "/sys/class/hwmon/";
-constexpr char kDeviceDir[] = "device";
-constexpr char kHwmonDirectoryPattern[] = "hwmon*";
-constexpr char kCPUTempFilePattern[] = "temp*_input";
-
-// The contents of sysfs files might contain a newline at the end. Use this
-// function to read from a sysfs file and remove the newline.
-bool ReadFileContentsAndTrimWhitespace(const base::FilePath& path,
-                                       std::string* contents_out) {
-  if (!base::ReadFileToString(path, contents_out))
-    return false;
-  base::TrimWhitespaceASCII(*contents_out, base::TRIM_TRAILING, contents_out);
-  return true;
-}
-
-// Reads the temperature as degrees Celsius from the file at |path|, which is
-// expected to contain the temperature in millidegrees Celsius. Converts the
-// value into degrees and then stores it in |*temp_celsius_out|. returns true if
-// the value was successfully read from file, parsed as an int, and converted.
-bool ReadTemperatureFromPath(const base::FilePath& path,
-                             double* temp_celsius_out) {
-  std::string temperature_string;
-  if (!ReadFileContentsAndTrimWhitespace(path, &temperature_string))
-    return false;
-  uint32_t temperature = 0;
-  if (!base::StringToUint(temperature_string, &temperature))
-    return false;
-  *temp_celsius_out = temperature / 1000.0;
-  return true;
-}
-
-// Gets the label describing this temperature. Use the file "temp*_label" if it
-// is present, or fall back on the file "name" or |label_path|.
-std::string GetLabelFromPath(const base::FilePath& label_path) {
-  std::string label;
-  if (base::PathExists(label_path) &&
-      ReadFileContentsAndTrimWhitespace(base::FilePath(label_path), &label) &&
-      !label.empty()) {
-    return label;
-  }
-
-  base::FilePath name_path = label_path.DirName().Append("name");
-  if (base::PathExists(name_path) &&
-      ReadFileContentsAndTrimWhitespace(name_path, &label) && !label.empty()) {
-    return label;
-  }
-  return label_path.value();
-}
-
-}  // namespace
-
-CPUTemperatureReader::CPUTemperatureInfo::CPUTemperatureInfo() {}
-
-CPUTemperatureReader::CPUTemperatureInfo::~CPUTemperatureInfo() = default;
-
-CPUTemperatureReader::CPUTemperatureReader() : hwmon_dir_(kDefaultHwmonDir) {}
-
-CPUTemperatureReader::~CPUTemperatureReader() = default;
-
-std::vector<CPUTemperatureInfo> CPUTemperatureReader::GetCPUTemperatures() {
-  std::vector<CPUTemperatureInfo> result;
-
-  // Get directories /sys/class/hwmon/hwmon*.
-  base::FileEnumerator hwmon_enumerator(hwmon_dir_, false,
-                                        base::FileEnumerator::DIRECTORIES,
-                                        kHwmonDirectoryPattern);
-  for (base::FilePath hwmon_path = hwmon_enumerator.Next(); !hwmon_path.empty();
-       hwmon_path = hwmon_enumerator.Next()) {
-    // Get temp*_input files in hwmon*/ and hwmon*/device/.
-    if (base::PathExists(hwmon_path.Append(kDeviceDir))) {
-      hwmon_path = hwmon_path.Append(kDeviceDir);
-    }
-    base::FileEnumerator enumerator(
-        hwmon_path, false, base::FileEnumerator::FILES, kCPUTempFilePattern);
-    for (base::FilePath temperature_path = enumerator.Next();
-         !temperature_path.empty(); temperature_path = enumerator.Next()) {
-      CPUTemperatureInfo info;
-      if (!ReadTemperatureFromPath(temperature_path, &info.temp_celsius)) {
-        LOG(WARNING) << "Unable to read CPU temperature from "
-                     << temperature_path.value();
-        continue;
-      }
-      // Get appropriate temp*_label file.
-      std::string label_path = temperature_path.value();
-      base::ReplaceSubstringsAfterOffset(&label_path, 0, "input", "label");
-      info.label = GetLabelFromPath(base::FilePath(label_path));
-      result.push_back(info);
-    }
-  }
-  return result;
-}
-
-}  // namespace system
-}  // namespace chromeos