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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 "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/browser/metrics/cloned_install_detector.h" | |
| 17 #include "chrome/browser/metrics/machine_id_provider.h" | |
| 18 #include "chrome/common/chrome_switches.h" | |
| 19 #include "chrome/common/metrics/caching_permuted_entropy_provider.h" | |
| 20 #include "chrome/common/pref_names.h" | |
| 21 | |
| 22 #if defined(OS_CHROMEOS) | |
| 23 #include "chrome/browser/chromeos/settings/cros_settings.h" | |
| 24 #endif | |
| 25 | |
| 26 namespace metrics { | |
| 27 | |
| 28 namespace { | |
| 29 | |
| 30 // The argument used to generate a non-identifying entropy source. We want no | |
| 31 // more than 13 bits of entropy, so use this max to return a number in the range | |
| 32 // [0, 7999] as the entropy source (12.97 bits of entropy). | |
| 33 const int kMaxLowEntropySize = 8000; | |
| 34 | |
| 35 // Default prefs value for prefs::kMetricsLowEntropySource to indicate that the | |
| 36 // value has not yet been set. | |
| 37 const int kLowEntropySourceNotSet = -1; | |
| 38 | |
| 39 // Generates a new non-identifying entropy source used to seed persistent | |
| 40 // activities. | |
| 41 int GenerateLowEntropySource() { | |
| 42 return base::RandInt(0, kMaxLowEntropySize - 1); | |
| 43 } | |
| 44 | |
| 45 } // namespace | |
| 46 | |
| 47 // static | |
| 48 bool MetricsStateManager::instance_exists_ = false; | |
| 49 | |
| 50 MetricsStateManager::MetricsStateManager(PrefService* local_state) | |
| 51 : local_state_(local_state), | |
| 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 // If the user permits metrics reporting with the checkbox in the | |
| 69 // prefs, we turn on recording. We disable metrics completely for | |
| 70 // non-official builds. This can be forced with a flag. | |
| 71 const CommandLine* command_line = CommandLine::ForCurrentProcess(); | |
| 72 if (command_line->HasSwitch(switches::kEnableMetricsReportingForTesting)) | |
| 73 return true; | |
| 74 | |
| 75 // Disable metrics reporting when field trials are forced. | |
| 76 if (command_line->HasSwitch(switches::kForceFieldTrials)) | |
| 77 return false; | |
| 78 | |
| 79 bool enabled = false; | |
| 80 #if defined(GOOGLE_CHROME_BUILD) | |
| 81 #if defined(OS_CHROMEOS) | |
| 82 chromeos::CrosSettings::Get()->GetBoolean(chromeos::kStatsReportingPref, | |
| 83 &enabled); | |
| 84 #else | |
| 85 enabled = local_state->GetBoolean(prefs::kMetricsReportingEnabled); | |
| 86 #endif // #if defined(OS_CHROMEOS) | |
| 87 #endif // defined(GOOGLE_CHROME_BUILD) | |
| 88 return enabled; | |
| 89 } | |
| 90 | |
| 91 void MetricsStateManager::ForceClientIdCreation() { | |
| 92 if (!client_id_.empty()) | |
| 93 return; | |
| 94 | |
| 95 client_id_ = local_state_->GetString(prefs::kMetricsClientID); | |
| 96 if (!client_id_.empty()) | |
| 97 return; | |
| 98 | |
| 99 client_id_ = base::GenerateGUID(); | |
| 100 local_state_->SetString(prefs::kMetricsClientID, client_id_); | |
| 101 | |
| 102 if (local_state_->GetString(prefs::kMetricsOldClientID).empty()) { | |
| 103 // Record the timestamp of when the user opted in to UMA. | |
| 104 local_state_->SetInt64(prefs::kMetricsReportingEnabledTimestamp, | |
| 105 base::Time::Now().ToTimeT()); | |
| 106 } else { | |
| 107 UMA_HISTOGRAM_BOOLEAN("UMA.ClientIdMigrated", true); | |
| 108 } | |
| 109 local_state_->ClearPref(prefs::kMetricsOldClientID); | |
| 110 } | |
| 111 | |
| 112 void MetricsStateManager::CheckForClonedInstall() { | |
| 113 DCHECK(!cloned_install_detector_); | |
| 114 | |
| 115 MachineIdProvider* provider = MachineIdProvider::CreateInstance(); | |
| 116 if (!provider) | |
| 117 return; | |
| 118 | |
| 119 cloned_install_detector_.reset(new ClonedInstallDetector(provider)); | |
| 120 cloned_install_detector_->CheckForClonedInstall(local_state_); | |
| 121 } | |
| 122 | |
| 123 scoped_ptr<const base::FieldTrial::EntropyProvider> | |
| 124 MetricsStateManager::CreateEntropyProvider() { | |
| 125 // For metrics reporting-enabled users, we combine the client ID and low | |
| 126 // entropy source to get the final entropy source. Otherwise, only use the low | |
| 127 // entropy source. | |
| 128 // This has two useful properties: | |
| 129 // 1) It makes the entropy source less identifiable for parties that do not | |
| 130 // know the low entropy source. | |
| 131 // 2) It makes the final entropy source resettable. | |
| 132 const int low_entropy_source_value = GetLowEntropySource(); | |
| 133 UMA_HISTOGRAM_SPARSE_SLOWLY("UMA.LowEntropySourceValue", | |
| 134 low_entropy_source_value); | |
| 135 if (IsMetricsReportingEnabled()) { | |
| 136 if (entropy_source_returned_ == ENTROPY_SOURCE_NONE) | |
| 137 entropy_source_returned_ = ENTROPY_SOURCE_HIGH; | |
| 138 DCHECK_EQ(ENTROPY_SOURCE_HIGH, entropy_source_returned_); | |
| 139 const std::string high_entropy_source = | |
| 140 client_id_ + base::IntToString(low_entropy_source_value); | |
| 141 return scoped_ptr<const base::FieldTrial::EntropyProvider>( | |
| 142 new SHA1EntropyProvider(high_entropy_source)); | |
| 143 } | |
| 144 | |
| 145 if (entropy_source_returned_ == ENTROPY_SOURCE_NONE) | |
| 146 entropy_source_returned_ = ENTROPY_SOURCE_LOW; | |
| 147 DCHECK_EQ(ENTROPY_SOURCE_LOW, entropy_source_returned_); | |
| 148 | |
| 149 #if defined(OS_ANDROID) || defined(OS_IOS) | |
| 150 return scoped_ptr<const base::FieldTrial::EntropyProvider>( | |
| 151 new CachingPermutedEntropyProvider(local_state_, | |
| 152 low_entropy_source_value, | |
| 153 kMaxLowEntropySize)); | |
| 154 #else | |
| 155 return scoped_ptr<const base::FieldTrial::EntropyProvider>( | |
| 156 new PermutedEntropyProvider(low_entropy_source_value, | |
| 157 kMaxLowEntropySize)); | |
| 158 #endif | |
| 159 } | |
| 160 | |
| 161 // static | |
| 162 scoped_ptr<MetricsStateManager> MetricsStateManager::Create( | |
| 163 PrefService* local_state) { | |
| 164 scoped_ptr<MetricsStateManager> result; | |
| 165 // Note: |instance_exists_| is updated in the constructor and destructor. | |
| 166 if (!instance_exists_) | |
| 167 result.reset(new MetricsStateManager(local_state)); | |
| 168 return result.Pass(); | |
| 169 } | |
| 170 | |
| 171 // static | |
| 172 void MetricsStateManager::RegisterPrefs(PrefRegistrySimple* registry) { | |
| 173 registry->RegisterBooleanPref(prefs::kMetricsResetIds, false); | |
| 174 registry->RegisterStringPref(prefs::kMetricsClientID, std::string()); | |
| 175 registry->RegisterInt64Pref(prefs::kMetricsReportingEnabledTimestamp, 0); | |
| 176 registry->RegisterIntegerPref(prefs::kMetricsLowEntropySource, | |
| 177 kLowEntropySourceNotSet); | |
| 178 | |
| 179 ClonedInstallDetector::RegisterPrefs(registry); | |
| 180 CachingPermutedEntropyProvider::RegisterPrefs(registry); | |
| 181 | |
| 182 // TODO(asvitkine): Remove these once a couple of releases have passed. | |
| 183 // http://crbug.com/357704 | |
| 184 registry->RegisterStringPref(prefs::kMetricsOldClientID, std::string()); | |
| 185 registry->RegisterIntegerPref(prefs::kMetricsOldLowEntropySource, 0); | |
| 186 } | |
| 187 | |
| 188 int MetricsStateManager::GetLowEntropySource() { | |
| 189 // Note that the default value for the low entropy source and the default pref | |
| 190 // value are both kLowEntropySourceNotSet, which is used to identify if the | |
| 191 // value has been set or not. | |
| 192 if (low_entropy_source_ != kLowEntropySourceNotSet) | |
| 193 return low_entropy_source_; | |
| 194 | |
| 195 const CommandLine* command_line(CommandLine::ForCurrentProcess()); | |
| 196 // Only try to load the value from prefs if the user did not request a reset. | |
| 197 // Otherwise, skip to generating a new value. | |
| 198 if (!command_line->HasSwitch(switches::kResetVariationState)) { | |
| 199 int value = local_state_->GetInteger(prefs::kMetricsLowEntropySource); | |
| 200 // If the value is outside the [0, kMaxLowEntropySize) range, re-generate | |
| 201 // it below. | |
| 202 if (value >= 0 && value < kMaxLowEntropySize) { | |
| 203 low_entropy_source_ = value; | |
| 204 UMA_HISTOGRAM_BOOLEAN("UMA.GeneratedLowEntropySource", false); | |
| 205 return low_entropy_source_; | |
| 206 } | |
| 207 } | |
| 208 | |
| 209 UMA_HISTOGRAM_BOOLEAN("UMA.GeneratedLowEntropySource", true); | |
| 210 low_entropy_source_ = GenerateLowEntropySource(); | |
| 211 local_state_->SetInteger(prefs::kMetricsLowEntropySource, | |
| 212 low_entropy_source_); | |
| 213 local_state_->ClearPref(prefs::kMetricsOldLowEntropySource); | |
| 214 metrics::CachingPermutedEntropyProvider::ClearCache(local_state_); | |
| 215 | |
| 216 return low_entropy_source_; | |
| 217 } | |
| 218 | |
| 219 void MetricsStateManager::ResetMetricsIDsIfNecessary() { | |
| 220 if (!local_state_->GetBoolean(prefs::kMetricsResetIds)) | |
| 221 return; | |
| 222 | |
| 223 UMA_HISTOGRAM_BOOLEAN("UMA.MetricsIDsReset", true); | |
| 224 | |
| 225 DCHECK(client_id_.empty()); | |
| 226 DCHECK_EQ(kLowEntropySourceNotSet, low_entropy_source_); | |
| 227 | |
| 228 local_state_->ClearPref(prefs::kMetricsClientID); | |
| 229 local_state_->ClearPref(prefs::kMetricsLowEntropySource); | |
| 230 local_state_->ClearPref(prefs::kMetricsResetIds); | |
| 231 } | |
| 232 | |
| 233 } // namespace metrics | |
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Chromium Code Reviews
Issue 268223002:
Revert 268232 "Refactor MetricsStateManager class out of Metrics..." (Closed)
Base URL: svn://svn.chromium.org/chrome/