chrome/browser/prefs/tracked/tracked_preference_helper.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 "chrome/browser/prefs/tracked/tracked_preference_helper.h"
   6
   7 #include "base/logging.h"
   8 #include "base/metrics/histogram.h"
   9
  10 TrackedPreferenceHelper::TrackedPreferenceHelper(
  11     const std::string& pref_path,
  12     size_t reporting_id,
  13     size_t reporting_ids_count,
  14     PrefHashFilter::EnforcementLevel enforcement_level)
  15     : pref_path_(pref_path),
  16       reporting_id_(reporting_id), reporting_ids_count_(reporting_ids_count),
  17       enforce_(enforcement_level == PrefHashFilter::ENFORCE_ON_LOAD) {
  18 }
  19
  20 TrackedPreferenceHelper::ResetAction TrackedPreferenceHelper::GetAction(
  21     PrefHashStoreTransaction::ValueState value_state) const {
  22   switch (value_state) {
  23     case PrefHashStoreTransaction::UNCHANGED:
  24       // Desired case, nothing to do.
  25       return DONT_RESET;
  26     case PrefHashStoreTransaction::CLEARED:
  27       // Unfortunate case, but there is nothing we can do.
  28       return DONT_RESET;
  29     case PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE:
  30       // It is okay to seed the hash in this case.
  31       return DONT_RESET;
  32     case PrefHashStoreTransaction::SECURE_LEGACY:
  33       // Accept secure legacy device ID based hashes.
  34       return DONT_RESET;
  35     case PrefHashStoreTransaction::WEAK_LEGACY:  // Falls through.
  36     case PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE:  // Falls through.
  37     case PrefHashStoreTransaction::CHANGED:
  38       return enforce_ ? DO_RESET : WANTED_RESET;
  39   }
  40   NOTREACHED() << "Unexpected PrefHashStoreTransaction::ValueState: "
  41                << value_state;
  42   return DONT_RESET;
  43 }
  44
  45 void TrackedPreferenceHelper::ReportValidationResult(
  46     PrefHashStoreTransaction::ValueState value_state) const {
  47   switch (value_state) {
  48     case PrefHashStoreTransaction::UNCHANGED:
  49       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceUnchanged",
  50                                 reporting_id_, reporting_ids_count_);
  51       return;
  52     case PrefHashStoreTransaction::CLEARED:
  53       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceCleared",
  54                                 reporting_id_, reporting_ids_count_);
  55       return;
  56     case PrefHashStoreTransaction::WEAK_LEGACY:
  57       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceMigrated",
  58                                 reporting_id_, reporting_ids_count_);
  59       return;
  60     case PrefHashStoreTransaction::SECURE_LEGACY:
  61       UMA_HISTOGRAM_ENUMERATION(
  62           "Settings.TrackedPreferenceMigratedLegacyDeviceId", reporting_id_,
  63           reporting_ids_count_);
  64       return;
  65     case PrefHashStoreTransaction::CHANGED:
  66       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceChanged",
  67                                 reporting_id_, reporting_ids_count_);
  68       return;
  69     case PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE:
  70       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceInitialized",
  71                                 reporting_id_, reporting_ids_count_);
  72       return;
  73     case PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE:
  74       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceTrustedInitialized",
  75                                 reporting_id_, reporting_ids_count_);
  76       return;
  77   }
  78   NOTREACHED() << "Unexpected PrefHashStoreTransaction::ValueState: "
  79                << value_state;
  80 }
  81
  82 void TrackedPreferenceHelper::ReportAction(ResetAction reset_action) const {
  83   switch (reset_action) {
  84     case DONT_RESET:
  85       // No report for DONT_RESET.
  86       break;
  87     case WANTED_RESET:
  88       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceWantedReset",
  89                                 reporting_id_, reporting_ids_count_);
  90       break;
  91     case DO_RESET:
  92       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceReset",
  93                                 reporting_id_, reporting_ids_count_);
  94       break;
  95   }
  96 }
  97
  98 void TrackedPreferenceHelper::ReportSplitPreferenceChangedCount(
  99     size_t count) const {
 100   // The histogram below is an expansion of the UMA_HISTOGRAM_COUNTS_100 macro
 101   // adapted to allow for a dynamically suffixed histogram name.
 102   // Note: The factory creates and owns the histogram.
 103   base::HistogramBase* histogram =
 104       base::LinearHistogram::FactoryGet(
 105           "Settings.TrackedSplitPreferenceChanged." + pref_path_,
 106           1,
 107           100,  // Allow counts up to 100.
 108           101,
 109           base::HistogramBase::kUmaTargetedHistogramFlag);
 110   histogram->Add(count);
 111 }