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      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_(
     23           local_state->GetBoolean(metrics::prefs::kStabilityExitedCleanly)),
     24       backup_registry_key_(backup_registry_key) {
     25   DCHECK_NE(PrefService::INITIALIZATION_STATUS_WAITING,
     26             local_state_->GetInitializationStatus());
     27 
     28 #if defined(OS_WIN)
     29   // An enumeration of all possible permutations of the the beacon state in the
     30   // registry and in Local State.
     31   enum {
     32     DIRTY_DIRTY,
     33     DIRTY_CLEAN,
     34     CLEAN_DIRTY,
     35     CLEAN_CLEAN,
     36     MISSING_DIRTY,
     37     MISSING_CLEAN,
     38     NUM_CONSISTENCY_ENUMS
     39   } consistency = DIRTY_DIRTY;
     40 
     41   base::win::RegKey regkey;
     42   DWORD value = 0u;
     43   if (regkey.Open(HKEY_CURRENT_USER,
     44                   backup_registry_key_.c_str(),
     45                   KEY_ALL_ACCESS) == ERROR_SUCCESS &&
     46       regkey.ReadValueDW(
     47           base::ASCIIToUTF16(metrics::prefs::kStabilityExitedCleanly).c_str(),
     48           &value) == ERROR_SUCCESS) {
     49     if (value)
     50       consistency = initial_value_ ? CLEAN_CLEAN : CLEAN_DIRTY;
     51     else
     52       consistency = initial_value_ ? DIRTY_CLEAN : DIRTY_DIRTY;
     53   } else {
     54     consistency = initial_value_ ? MISSING_CLEAN : MISSING_DIRTY;
     55   }
     56 
     57   UMA_HISTOGRAM_ENUMERATION(
     58       "UMA.CleanExitBeaconConsistency", consistency, NUM_CONSISTENCY_ENUMS);
     59 #endif
     60 }
     61 
     62 CleanExitBeacon::~CleanExitBeacon() {
     63 }
     64 
     65 void CleanExitBeacon::WriteBeaconValue(bool value) {
     66   local_state_->SetBoolean(metrics::prefs::kStabilityExitedCleanly, value);
     67 
     68 #if defined(OS_WIN)
     69   base::win::RegKey regkey;
     70   if (regkey.Create(HKEY_CURRENT_USER,
     71                     backup_registry_key_.c_str(),
     72                     KEY_ALL_ACCESS) == ERROR_SUCCESS) {
     73     regkey.WriteValue(
     74         base::ASCIIToUTF16(metrics::prefs::kStabilityExitedCleanly).c_str(),
     75         value ? 1u : 0u);
     76   }
     77 #endif
     78 }
     79 
     80 }  // namespace metrics
     81