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::UNTRUSTED_UNKNOWN_VALUE:  // Falls through.
  36     case PrefHashStoreTransaction::CHANGED:
  37       return enforce_ ? DO_RESET : WANTED_RESET;
  38   }
  39   NOTREACHED() << "Unexpected PrefHashStoreTransaction::ValueState: "
  40                << value_state;
  41   return DONT_RESET;
  42 }
  43
  44 void TrackedPreferenceHelper::ReportValidationResult(
  45     PrefHashStoreTransaction::ValueState value_state) const {
  46   switch (value_state) {
  47     case PrefHashStoreTransaction::UNCHANGED:
  48       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceUnchanged",
  49                                 reporting_id_, reporting_ids_count_);
  50       return;
  51     case PrefHashStoreTransaction::CLEARED:
  52       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceCleared",
  53                                 reporting_id_, reporting_ids_count_);
  54       return;
  55     case PrefHashStoreTransaction::SECURE_LEGACY:
  56       UMA_HISTOGRAM_ENUMERATION(
  57           "Settings.TrackedPreferenceMigratedLegacyDeviceId", reporting_id_,
  58           reporting_ids_count_);
  59       return;
  60     case PrefHashStoreTransaction::CHANGED:
  61       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceChanged",
  62                                 reporting_id_, reporting_ids_count_);
  63       return;
  64     case PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE:
  65       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceInitialized",
  66                                 reporting_id_, reporting_ids_count_);
  67       return;
  68     case PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE:
  69       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceTrustedInitialized",
  70                                 reporting_id_, reporting_ids_count_);
  71       return;
  72   }
  73   NOTREACHED() << "Unexpected PrefHashStoreTransaction::ValueState: "
  74                << value_state;
  75 }
  76
  77 void TrackedPreferenceHelper::ReportAction(ResetAction reset_action) const {
  78   switch (reset_action) {
  79     case DONT_RESET:
  80       // No report for DONT_RESET.
  81       break;
  82     case WANTED_RESET:
  83       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceWantedReset",
  84                                 reporting_id_, reporting_ids_count_);
  85       break;
  86     case DO_RESET:
  87       UMA_HISTOGRAM_ENUMERATION("Settings.TrackedPreferenceReset",
  88                                 reporting_id_, reporting_ids_count_);
  89       break;
  90   }
  91 }
  92
  93 void TrackedPreferenceHelper::ReportSplitPreferenceChangedCount(
  94     size_t count) const {
  95   // The histogram below is an expansion of the UMA_HISTOGRAM_COUNTS_100 macro
  96   // adapted to allow for a dynamically suffixed histogram name.
  97   // Note: The factory creates and owns the histogram.
  98   base::HistogramBase* histogram =
  99       base::LinearHistogram::FactoryGet(
 100           "Settings.TrackedSplitPreferenceChanged." + pref_path_,
 101           1,
 102           100,  // Allow counts up to 100.
 103           101,
 104           base::HistogramBase::kUmaTargetedHistogramFlag);
 105   histogram->Add(count);
 106 }