components/metrics/clean_exit_beacon.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/metrics/clean_exit_beacon.h"
   6
   7 #include "base/logging.h"
   8 #include "base/prefs/pref_service.h"
   9 #include "components/metrics/metrics_pref_names.h"
  10
  11 #if defined(OS_WIN)
  12 #include "base/metrics/histogram.h"
  13 #include "base/strings/utf_string_conversions.h"
  14 #include "base/win/registry.h"
  15 #endif
  16
  17 namespace metrics {
  18
  19 CleanExitBeacon::CleanExitBeacon(const base::string16& backup_registry_key,
  20                                  PrefService* local_state)
  21     : local_state_(local_state),
  22       initial_value_(local_state->GetBoolean(prefs::kStabilityExitedCleanly)),
  23       backup_registry_key_(backup_registry_key) {
  24   DCHECK_NE(PrefService::INITIALIZATION_STATUS_WAITING,
  25             local_state_->GetInitializationStatus());
  26
  27 #if defined(OS_WIN)
  28   // An enumeration of all possible permutations of the the beacon state in the
  29   // registry and in Local State.
  30   enum {
  31     DIRTY_DIRTY,
  32     DIRTY_CLEAN,
  33     CLEAN_DIRTY,
  34     CLEAN_CLEAN,
  35     MISSING_DIRTY,
  36     MISSING_CLEAN,
  37     NUM_CONSISTENCY_ENUMS
  38   } consistency = DIRTY_DIRTY;
  39
  40   base::win::RegKey regkey;
  41   DWORD value = 0u;
  42   if (regkey.Open(HKEY_CURRENT_USER,
  43                   backup_registry_key_.c_str(),
  44                   KEY_ALL_ACCESS) == ERROR_SUCCESS &&
  45       regkey.ReadValueDW(
  46           base::ASCIIToUTF16(prefs::kStabilityExitedCleanly).c_str(), &value) ==
  47           ERROR_SUCCESS) {
  48     if (value)
  49       consistency = initial_value_ ? CLEAN_CLEAN : CLEAN_DIRTY;
  50     else
  51       consistency = initial_value_ ? DIRTY_CLEAN : DIRTY_DIRTY;
  52   } else {
  53     consistency = initial_value_ ? MISSING_CLEAN : MISSING_DIRTY;
  54   }
  55
  56   UMA_HISTOGRAM_ENUMERATION(
  57       "UMA.CleanExitBeaconConsistency", consistency, NUM_CONSISTENCY_ENUMS);
  58 #endif
  59 }
  60
  61 CleanExitBeacon::~CleanExitBeacon() {
  62 }
  63
  64 void CleanExitBeacon::WriteBeaconValue(bool value) {
  65   local_state_->SetBoolean(prefs::kStabilityExitedCleanly, value);
  66
  67 #if defined(OS_WIN)
  68   base::win::RegKey regkey;
  69   if (regkey.Create(HKEY_CURRENT_USER,
  70                     backup_registry_key_.c_str(),
  71                     KEY_ALL_ACCESS) == ERROR_SUCCESS) {
  72     regkey.WriteValue(
  73         base::ASCIIToUTF16(prefs::kStabilityExitedCleanly).c_str(),
  74         value ? 1u : 0u);
  75   }
  76 #endif
  77 }
  78
  79 }  // namespace metrics