| OLD | NEW |
|---|
| (Empty) |
| 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/metrics/metrics_state_manager.h" | |
| 6 | |
| 7 #include "base/command_line.h" | |
| 8 #include "base/guid.h" | |
| 9 #include "base/metrics/histogram.h" | |
| 10 #include "base/metrics/sparse_histogram.h" | |
| 11 #include "base/prefs/pref_registry_simple.h" | |
| 12 #include "base/prefs/pref_service.h" | |
| 13 #include "base/rand_util.h" | |
| 14 #include "base/strings/string_number_conversions.h" | |
| 15 #include "base/time/time.h" | |
| 16 #include "chrome/common/chrome_switches.h" | |
| 17 #include "chrome/common/pref_names.h" | |
| 18 #include "components/metrics/cloned_install_detector.h" | |
| 19 #include "components/metrics/machine_id_provider.h" | |
| 20 #include "components/metrics/metrics_pref_names.h" | |
| 21 #include "components/variations/caching_permuted_entropy_provider.h" | |
| 22 | |
| 23 namespace metrics { | |
| 24 | |
| 25 namespace { | |
| 26 | |
| 27 // The argument used to generate a non-identifying entropy source. We want no | |
| 28 // more than 13 bits of entropy, so use this max to return a number in the range | |
| 29 // [0, 7999] as the entropy source (12.97 bits of entropy). | |
| 30 const int kMaxLowEntropySize = 8000; | |
| 31 | |
| 32 // Default prefs value for ::prefs::kMetricsLowEntropySource to indicate that | |
| 33 // the value has not yet been set. | |
| 34 const int kLowEntropySourceNotSet = -1; | |
| 35 | |
| 36 // Generates a new non-identifying entropy source used to seed persistent | |
| 37 // activities. | |
| 38 int GenerateLowEntropySource() { | |
| 39 return base::RandInt(0, kMaxLowEntropySize - 1); | |
| 40 } | |
| 41 | |
| 42 } // namespace | |
| 43 | |
| 44 // static | |
| 45 bool MetricsStateManager::instance_exists_ = false; | |
| 46 | |
| 47 MetricsStateManager::MetricsStateManager( | |
| 48 PrefService* local_state, | |
| 49 const base::Callback<bool(void)>& is_reporting_enabled_callback) | |
| 50 : local_state_(local_state), | |
| 51 is_reporting_enabled_callback_(is_reporting_enabled_callback), | |
| 52 low_entropy_source_(kLowEntropySourceNotSet), | |
| 53 entropy_source_returned_(ENTROPY_SOURCE_NONE) { | |
| 54 ResetMetricsIDsIfNecessary(); | |
| 55 if (IsMetricsReportingEnabled()) | |
| 56 ForceClientIdCreation(); | |
| 57 | |
| 58 DCHECK(!instance_exists_); | |
| 59 instance_exists_ = true; | |
| 60 } | |
| 61 | |
| 62 MetricsStateManager::~MetricsStateManager() { | |
| 63 DCHECK(instance_exists_); | |
| 64 instance_exists_ = false; | |
| 65 } | |
| 66 | |
| 67 bool MetricsStateManager::IsMetricsReportingEnabled() { | |
| 68 return is_reporting_enabled_callback_.Run(); | |
| 69 } | |
| 70 | |
| 71 void MetricsStateManager::ForceClientIdCreation() { | |
| 72 if (!client_id_.empty()) | |
| 73 return; | |
| 74 | |
| 75 client_id_ = local_state_->GetString(::prefs::kMetricsClientID); | |
| 76 if (!client_id_.empty()) | |
| 77 return; | |
| 78 | |
| 79 client_id_ = base::GenerateGUID(); | |
| 80 local_state_->SetString(::prefs::kMetricsClientID, client_id_); | |
| 81 | |
| 82 if (local_state_->GetString(::prefs::kMetricsOldClientID).empty()) { | |
| 83 // Record the timestamp of when the user opted in to UMA. | |
| 84 local_state_->SetInt64(::prefs::kMetricsReportingEnabledTimestamp, | |
| 85 base::Time::Now().ToTimeT()); | |
| 86 } else { | |
| 87 UMA_HISTOGRAM_BOOLEAN("UMA.ClientIdMigrated", true); | |
| 88 } | |
| 89 local_state_->ClearPref(::prefs::kMetricsOldClientID); | |
| 90 } | |
| 91 | |
| 92 void MetricsStateManager::CheckForClonedInstall( | |
| 93 scoped_refptr<base::SingleThreadTaskRunner> task_runner) { | |
| 94 DCHECK(!cloned_install_detector_); | |
| 95 | |
| 96 MachineIdProvider* provider = MachineIdProvider::CreateInstance(); | |
| 97 if (!provider) | |
| 98 return; | |
| 99 | |
| 100 cloned_install_detector_.reset(new ClonedInstallDetector(provider)); | |
| 101 cloned_install_detector_->CheckForClonedInstall(local_state_, task_runner); | |
| 102 } | |
| 103 | |
| 104 scoped_ptr<const base::FieldTrial::EntropyProvider> | |
| 105 MetricsStateManager::CreateEntropyProvider() { | |
| 106 // For metrics reporting-enabled users, we combine the client ID and low | |
| 107 // entropy source to get the final entropy source. Otherwise, only use the low | |
| 108 // entropy source. | |
| 109 // This has two useful properties: | |
| 110 // 1) It makes the entropy source less identifiable for parties that do not | |
| 111 // know the low entropy source. | |
| 112 // 2) It makes the final entropy source resettable. | |
| 113 const int low_entropy_source_value = GetLowEntropySource(); | |
| 114 UMA_HISTOGRAM_SPARSE_SLOWLY("UMA.LowEntropySourceValue", | |
| 115 low_entropy_source_value); | |
| 116 if (IsMetricsReportingEnabled()) { | |
| 117 if (entropy_source_returned_ == ENTROPY_SOURCE_NONE) | |
| 118 entropy_source_returned_ = ENTROPY_SOURCE_HIGH; | |
| 119 DCHECK_EQ(ENTROPY_SOURCE_HIGH, entropy_source_returned_); | |
| 120 const std::string high_entropy_source = | |
| 121 client_id_ + base::IntToString(low_entropy_source_value); | |
| 122 return scoped_ptr<const base::FieldTrial::EntropyProvider>( | |
| 123 new SHA1EntropyProvider(high_entropy_source)); | |
| 124 } | |
| 125 | |
| 126 if (entropy_source_returned_ == ENTROPY_SOURCE_NONE) | |
| 127 entropy_source_returned_ = ENTROPY_SOURCE_LOW; | |
| 128 DCHECK_EQ(ENTROPY_SOURCE_LOW, entropy_source_returned_); | |
| 129 | |
| 130 #if defined(OS_ANDROID) || defined(OS_IOS) | |
| 131 return scoped_ptr<const base::FieldTrial::EntropyProvider>( | |
| 132 new CachingPermutedEntropyProvider(local_state_, | |
| 133 low_entropy_source_value, | |
| 134 kMaxLowEntropySize)); | |
| 135 #else | |
| 136 return scoped_ptr<const base::FieldTrial::EntropyProvider>( | |
| 137 new PermutedEntropyProvider(low_entropy_source_value, | |
| 138 kMaxLowEntropySize)); | |
| 139 #endif | |
| 140 } | |
| 141 | |
| 142 // static | |
| 143 scoped_ptr<MetricsStateManager> MetricsStateManager::Create( | |
| 144 PrefService* local_state, | |
| 145 const base::Callback<bool(void)>& is_reporting_enabled_callback) { | |
| 146 scoped_ptr<MetricsStateManager> result; | |
| 147 // Note: |instance_exists_| is updated in the constructor and destructor. | |
| 148 if (!instance_exists_) { | |
| 149 result.reset( | |
| 150 new MetricsStateManager(local_state, is_reporting_enabled_callback)); | |
| 151 } | |
| 152 return result.Pass(); | |
| 153 } | |
| 154 | |
| 155 // static | |
| 156 void MetricsStateManager::RegisterPrefs(PrefRegistrySimple* registry) { | |
| 157 registry->RegisterBooleanPref(prefs::kMetricsResetIds, false); | |
| 158 registry->RegisterStringPref(::prefs::kMetricsClientID, std::string()); | |
| 159 registry->RegisterInt64Pref(::prefs::kMetricsReportingEnabledTimestamp, 0); | |
| 160 registry->RegisterIntegerPref(::prefs::kMetricsLowEntropySource, | |
| 161 kLowEntropySourceNotSet); | |
| 162 | |
| 163 ClonedInstallDetector::RegisterPrefs(registry); | |
| 164 CachingPermutedEntropyProvider::RegisterPrefs(registry); | |
| 165 | |
| 166 // TODO(asvitkine): Remove these once a couple of releases have passed. | |
| 167 // http://crbug.com/357704 | |
| 168 registry->RegisterStringPref(::prefs::kMetricsOldClientID, std::string()); | |
| 169 registry->RegisterIntegerPref(::prefs::kMetricsOldLowEntropySource, 0); | |
| 170 } | |
| 171 | |
| 172 int MetricsStateManager::GetLowEntropySource() { | |
| 173 // Note that the default value for the low entropy source and the default pref | |
| 174 // value are both kLowEntropySourceNotSet, which is used to identify if the | |
| 175 // value has been set or not. | |
| 176 if (low_entropy_source_ != kLowEntropySourceNotSet) | |
| 177 return low_entropy_source_; | |
| 178 | |
| 179 const CommandLine* command_line(CommandLine::ForCurrentProcess()); | |
| 180 // Only try to load the value from ::prefs if the user did not request a | |
| 181 // reset. | |
| 182 // Otherwise, skip to generating a new value. | |
| 183 if (!command_line->HasSwitch(switches::kResetVariationState)) { | |
| 184 int value = local_state_->GetInteger(::prefs::kMetricsLowEntropySource); | |
| 185 // If the value is outside the [0, kMaxLowEntropySize) range, re-generate | |
| 186 // it below. | |
| 187 if (value >= 0 && value < kMaxLowEntropySize) { | |
| 188 low_entropy_source_ = value; | |
| 189 UMA_HISTOGRAM_BOOLEAN("UMA.GeneratedLowEntropySource", false); | |
| 190 return low_entropy_source_; | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 UMA_HISTOGRAM_BOOLEAN("UMA.GeneratedLowEntropySource", true); | |
| 195 low_entropy_source_ = GenerateLowEntropySource(); | |
| 196 local_state_->SetInteger(::prefs::kMetricsLowEntropySource, | |
| 197 low_entropy_source_); | |
| 198 local_state_->ClearPref(::prefs::kMetricsOldLowEntropySource); | |
| 199 CachingPermutedEntropyProvider::ClearCache(local_state_); | |
| 200 | |
| 201 return low_entropy_source_; | |
| 202 } | |
| 203 | |
| 204 void MetricsStateManager::ResetMetricsIDsIfNecessary() { | |
| 205 if (!local_state_->GetBoolean(prefs::kMetricsResetIds)) | |
| 206 return; | |
| 207 | |
| 208 UMA_HISTOGRAM_BOOLEAN("UMA.MetricsIDsReset", true); | |
| 209 | |
| 210 DCHECK(client_id_.empty()); | |
| 211 DCHECK_EQ(kLowEntropySourceNotSet, low_entropy_source_); | |
| 212 | |
| 213 local_state_->ClearPref(::prefs::kMetricsClientID); | |
| 214 local_state_->ClearPref(::prefs::kMetricsLowEntropySource); | |
| 215 local_state_->ClearPref(prefs::kMetricsResetIds); | |
| 216 } | |
| 217 | |
| 218 } // namespace metrics | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 312583002:
Move MetricsStateManager into the Metrics component. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src