components/metrics/metrics_state_manager_unittest.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 "components/metrics/metrics_state_manager.h"
   6
   7 #include <ctype.h>
   8 #include <string>
   9
  10 #include "base/bind.h"
  11 #include "base/command_line.h"
  12 #include "base/prefs/testing_pref_service.h"
  13 #include "components/metrics/client_info.h"
  14 #include "components/metrics/metrics_pref_names.h"
  15 #include "components/metrics/metrics_service.h"
  16 #include "components/metrics/metrics_switches.h"
  17 #include "components/variations/caching_permuted_entropy_provider.h"
  18 #include "components/variations/pref_names.h"
  19 #include "testing/gtest/include/gtest/gtest.h"
  20
  21 namespace metrics {
  22
  23 class MetricsStateManagerTest : public testing::Test {
  24  public:
  25   MetricsStateManagerTest() : is_metrics_reporting_enabled_(false) {
  26     MetricsService::RegisterPrefs(prefs_.registry());
  27   }
  28
  29   scoped_ptr<MetricsStateManager> CreateStateManager() {
  30     return MetricsStateManager::Create(
  31         &prefs_,
  32         base::Bind(&MetricsStateManagerTest::is_metrics_reporting_enabled,
  33                    base::Unretained(this)),
  34         base::Bind(&MetricsStateManagerTest::MockStoreClientInfoBackup,
  35                    base::Unretained(this)),
  36         base::Bind(&MetricsStateManagerTest::LoadFakeClientInfoBackup,
  37                    base::Unretained(this))).Pass();
  38   }
  39
  40   // Sets metrics reporting as enabled for testing.
  41   void EnableMetricsReporting() {
  42     is_metrics_reporting_enabled_ = true;
  43   }
  44
  45  protected:
  46   TestingPrefServiceSimple prefs_;
  47
  48   // Last ClientInfo stored by the MetricsStateManager via
  49   // MockStoreClientInfoBackup.
  50   scoped_ptr<ClientInfo> stored_client_info_backup_;
  51
  52   // If set, will be returned via LoadFakeClientInfoBackup if requested by the
  53   // MetricsStateManager.
  54   scoped_ptr<ClientInfo> fake_client_info_backup_;
  55
  56  private:
  57   bool is_metrics_reporting_enabled() const {
  58     return is_metrics_reporting_enabled_;
  59   }
  60
  61   // Stores the |client_info| in |stored_client_info_backup_| for verification
  62   // by the tests later.
  63   void MockStoreClientInfoBackup(const ClientInfo& client_info) {
  64     stored_client_info_backup_.reset(new ClientInfo);
  65     stored_client_info_backup_->client_id = client_info.client_id;
  66     stored_client_info_backup_->installation_date =
  67         client_info.installation_date;
  68     stored_client_info_backup_->reporting_enabled_date =
  69         client_info.reporting_enabled_date;
  70
  71     // Respect the contract that storing an empty client_id voids the existing
  72     // backup (required for the last section of the ForceClientIdCreation test
  73     // below).
  74     if (client_info.client_id.empty())
  75       fake_client_info_backup_.reset();
  76   }
  77
  78   // Hands out a copy of |fake_client_info_backup_| if it is set.
  79   scoped_ptr<ClientInfo> LoadFakeClientInfoBackup() {
  80     if (!fake_client_info_backup_)
  81       return scoped_ptr<ClientInfo>();
  82
  83     scoped_ptr<ClientInfo> backup_copy(new ClientInfo);
  84     backup_copy->client_id = fake_client_info_backup_->client_id;
  85     backup_copy->installation_date =
  86         fake_client_info_backup_->installation_date;
  87     backup_copy->reporting_enabled_date =
  88         fake_client_info_backup_->reporting_enabled_date;
  89     return backup_copy.Pass();
  90   }
  91
  92   bool is_metrics_reporting_enabled_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(MetricsStateManagerTest);
  95 };
  96
  97 // Ensure the ClientId is formatted as expected.
  98 TEST_F(MetricsStateManagerTest, ClientIdCorrectlyFormatted) {
  99   scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 100   state_manager->ForceClientIdCreation();
 101
 102   const std::string client_id = state_manager->client_id();
 103   EXPECT_EQ(36U, client_id.length());
 104
 105   for (size_t i = 0; i < client_id.length(); ++i) {
 106     char current = client_id[i];
 107     if (i == 8 || i == 13 || i == 18 || i == 23)
 108       EXPECT_EQ('-', current);
 109     else
 110       EXPECT_TRUE(isxdigit(current));
 111   }
 112 }
 113
 114 TEST_F(MetricsStateManagerTest, EntropySourceUsed_Low) {
 115   scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 116   state_manager->CreateEntropyProvider();
 117   EXPECT_EQ(MetricsStateManager::ENTROPY_SOURCE_LOW,
 118             state_manager->entropy_source_returned());
 119 }
 120
 121 TEST_F(MetricsStateManagerTest, EntropySourceUsed_High) {
 122   EnableMetricsReporting();
 123   scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 124   state_manager->CreateEntropyProvider();
 125   EXPECT_EQ(MetricsStateManager::ENTROPY_SOURCE_HIGH,
 126             state_manager->entropy_source_returned());
 127 }
 128
 129 TEST_F(MetricsStateManagerTest, LowEntropySource0NotReset) {
 130   scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 131
 132   // Get the low entropy source once, to initialize it.
 133   state_manager->GetLowEntropySource();
 134
 135   // Now, set it to 0 and ensure it doesn't get reset.
 136   state_manager->low_entropy_source_ = 0;
 137   EXPECT_EQ(0, state_manager->GetLowEntropySource());
 138   // Call it another time, just to make sure.
 139   EXPECT_EQ(0, state_manager->GetLowEntropySource());
 140 }
 141
 142 TEST_F(MetricsStateManagerTest,
 143        PermutedEntropyCacheClearedWhenLowEntropyReset) {
 144   const PrefService::Preference* low_entropy_pref =
 145       prefs_.FindPreference(prefs::kMetricsLowEntropySource);
 146   const char* kCachePrefName = prefs::kVariationsPermutedEntropyCache;
 147   int low_entropy_value = -1;
 148
 149   // First, generate an initial low entropy source value.
 150   {
 151     EXPECT_TRUE(low_entropy_pref->IsDefaultValue());
 152
 153     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 154     state_manager->GetLowEntropySource();
 155
 156     EXPECT_FALSE(low_entropy_pref->IsDefaultValue());
 157     EXPECT_TRUE(low_entropy_pref->GetValue()->GetAsInteger(&low_entropy_value));
 158   }
 159
 160   // Now, set a dummy value in the permuted entropy cache pref and verify that
 161   // another call to GetLowEntropySource() doesn't clobber it when
 162   // --reset-variation-state wasn't specified.
 163   {
 164     prefs_.SetString(kCachePrefName, "test");
 165
 166     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 167     state_manager->GetLowEntropySource();
 168
 169     EXPECT_EQ("test", prefs_.GetString(kCachePrefName));
 170     EXPECT_EQ(low_entropy_value,
 171               prefs_.GetInteger(prefs::kMetricsLowEntropySource));
 172   }
 173
 174   // Verify that the cache does get reset if --reset-variations-state is passed.
 175   {
 176     CommandLine::ForCurrentProcess()->AppendSwitch(
 177         switches::kResetVariationState);
 178
 179     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 180     state_manager->GetLowEntropySource();
 181
 182     EXPECT_TRUE(prefs_.GetString(kCachePrefName).empty());
 183   }
 184 }
 185
 186 // Check that setting the kMetricsResetIds pref to true causes the client id to
 187 // be reset. We do not check that the low entropy source is reset because we
 188 // cannot ensure that metrics state manager won't generate the same id again.
 189 TEST_F(MetricsStateManagerTest, ResetMetricsIDs) {
 190   // Set an initial client id in prefs. It should not be possible for the
 191   // metrics state manager to generate this id randomly.
 192   const std::string kInitialClientId = "initial client id";
 193   prefs_.SetString(prefs::kMetricsClientID, kInitialClientId);
 194
 195   // Make sure the initial client id isn't reset by the metrics state manager.
 196   {
 197     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 198     state_manager->ForceClientIdCreation();
 199     EXPECT_EQ(kInitialClientId, state_manager->client_id());
 200   }
 201
 202   // Set the reset pref to cause the IDs to be reset.
 203   prefs_.SetBoolean(prefs::kMetricsResetIds, true);
 204
 205   // Cause the actual reset to happen.
 206   {
 207     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 208     state_manager->ForceClientIdCreation();
 209     EXPECT_NE(kInitialClientId, state_manager->client_id());
 210
 211     state_manager->GetLowEntropySource();
 212
 213     EXPECT_FALSE(prefs_.GetBoolean(prefs::kMetricsResetIds));
 214   }
 215
 216   EXPECT_NE(kInitialClientId, prefs_.GetString(prefs::kMetricsClientID));
 217 }
 218
 219 TEST_F(MetricsStateManagerTest, ForceClientIdCreation) {
 220   const int64 kFakeInstallationDate = 12345;
 221   prefs_.SetInt64(prefs::kInstallDate, kFakeInstallationDate);
 222
 223   const int64 test_begin_time = base::Time::Now().ToTimeT();
 224
 225   // Holds ClientInfo from previous scoped test for extra checks.
 226   scoped_ptr<ClientInfo> previous_client_info;
 227
 228   {
 229     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 230
 231     // client_id shouldn't be auto-generated if metrics reporting is not
 232     // enabled.
 233     EXPECT_EQ(std::string(), state_manager->client_id());
 234     EXPECT_EQ(0, prefs_.GetInt64(prefs::kMetricsReportingEnabledTimestamp));
 235
 236     // Confirm that the initial ForceClientIdCreation call creates the client id
 237     // and backs it up via MockStoreClientInfoBackup.
 238     EXPECT_FALSE(stored_client_info_backup_);
 239     state_manager->ForceClientIdCreation();
 240     EXPECT_NE(std::string(), state_manager->client_id());
 241     EXPECT_GE(prefs_.GetInt64(prefs::kMetricsReportingEnabledTimestamp),
 242               test_begin_time);
 243
 244     ASSERT_TRUE(stored_client_info_backup_);
 245     EXPECT_EQ(state_manager->client_id(),
 246               stored_client_info_backup_->client_id);
 247     EXPECT_EQ(kFakeInstallationDate,
 248               stored_client_info_backup_->installation_date);
 249     EXPECT_EQ(prefs_.GetInt64(prefs::kMetricsReportingEnabledTimestamp),
 250               stored_client_info_backup_->reporting_enabled_date);
 251
 252     previous_client_info = stored_client_info_backup_.Pass();
 253   }
 254
 255   EnableMetricsReporting();
 256
 257   {
 258     EXPECT_FALSE(stored_client_info_backup_);
 259
 260     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 261
 262     // client_id should be auto-obtained from the constructor when metrics
 263     // reporting is enabled.
 264     EXPECT_EQ(previous_client_info->client_id, state_manager->client_id());
 265
 266     // The backup should also be refreshed when the client id re-initialized.
 267     ASSERT_TRUE(stored_client_info_backup_);
 268     EXPECT_EQ(previous_client_info->client_id,
 269               stored_client_info_backup_->client_id);
 270     EXPECT_EQ(kFakeInstallationDate,
 271               stored_client_info_backup_->installation_date);
 272     EXPECT_EQ(previous_client_info->reporting_enabled_date,
 273               stored_client_info_backup_->reporting_enabled_date);
 274
 275     // Re-forcing client id creation shouldn't cause another backup and
 276     // shouldn't affect the existing client id.
 277     stored_client_info_backup_.reset();
 278     state_manager->ForceClientIdCreation();
 279     EXPECT_FALSE(stored_client_info_backup_);
 280     EXPECT_EQ(previous_client_info->client_id, state_manager->client_id());
 281   }
 282
 283   const int64 kBackupInstallationDate = 1111;
 284   const int64 kBackupReportingEnabledDate = 2222;
 285   const char kBackupClientId[] = "AAAAAAAA-BBBB-CCCC-DDDD-EEEEEEEEEEEE";
 286   fake_client_info_backup_.reset(new ClientInfo);
 287   fake_client_info_backup_->client_id = kBackupClientId;
 288   fake_client_info_backup_->installation_date = kBackupInstallationDate;
 289   fake_client_info_backup_->reporting_enabled_date =
 290       kBackupReportingEnabledDate;
 291
 292   {
 293     // The existence of a backup should result in the same behaviour as
 294     // before if we already have a client id.
 295
 296     EXPECT_FALSE(stored_client_info_backup_);
 297
 298     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 299     EXPECT_EQ(previous_client_info->client_id, state_manager->client_id());
 300
 301     // The backup should also be refreshed when the client id re-initialized.
 302     ASSERT_TRUE(stored_client_info_backup_);
 303     EXPECT_EQ(previous_client_info->client_id,
 304               stored_client_info_backup_->client_id);
 305     EXPECT_EQ(kFakeInstallationDate,
 306               stored_client_info_backup_->installation_date);
 307     EXPECT_EQ(previous_client_info->reporting_enabled_date,
 308               stored_client_info_backup_->reporting_enabled_date);
 309     stored_client_info_backup_.reset();
 310   }
 311
 312   prefs_.ClearPref(prefs::kMetricsClientID);
 313   prefs_.ClearPref(prefs::kMetricsReportingEnabledTimestamp);
 314
 315   {
 316     // The backup should kick in if the client id has gone missing. It should
 317     // replace remaining and missing dates as well.
 318
 319     EXPECT_FALSE(stored_client_info_backup_);
 320
 321     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 322     EXPECT_EQ(kBackupClientId, state_manager->client_id());
 323     EXPECT_EQ(kBackupInstallationDate, prefs_.GetInt64(prefs::kInstallDate));
 324     EXPECT_EQ(kBackupReportingEnabledDate,
 325               prefs_.GetInt64(prefs::kMetricsReportingEnabledTimestamp));
 326
 327     EXPECT_TRUE(stored_client_info_backup_);
 328     stored_client_info_backup_.reset();
 329   }
 330
 331   const char kNoDashesBackupClientId[] = "AAAAAAAABBBBCCCCDDDDEEEEEEEEEEEE";
 332   fake_client_info_backup_.reset(new ClientInfo);
 333   fake_client_info_backup_->client_id = kNoDashesBackupClientId;
 334
 335   prefs_.ClearPref(prefs::kInstallDate);
 336   prefs_.ClearPref(prefs::kMetricsClientID);
 337   prefs_.ClearPref(prefs::kMetricsReportingEnabledTimestamp);
 338
 339   {
 340     // When running the backup from old-style client ids, dashes should be
 341     // re-added. And missing dates in backup should be replaced by Time::Now().
 342
 343     EXPECT_FALSE(stored_client_info_backup_);
 344
 345     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 346     EXPECT_EQ(kBackupClientId, state_manager->client_id());
 347     EXPECT_GE(prefs_.GetInt64(prefs::kInstallDate), test_begin_time);
 348     EXPECT_GE(prefs_.GetInt64(prefs::kMetricsReportingEnabledTimestamp),
 349               test_begin_time);
 350
 351     EXPECT_TRUE(stored_client_info_backup_);
 352     previous_client_info = stored_client_info_backup_.Pass();
 353   }
 354
 355   prefs_.SetBoolean(prefs::kMetricsResetIds, true);
 356
 357   {
 358     // Upon request to reset metrics ids, the existing backup should not be
 359     // restored.
 360
 361     EXPECT_FALSE(stored_client_info_backup_);
 362
 363     scoped_ptr<MetricsStateManager> state_manager(CreateStateManager());
 364
 365     // A brand new client id should have been generated.
 366     EXPECT_NE(std::string(), state_manager->client_id());
 367     EXPECT_NE(previous_client_info->client_id, state_manager->client_id());
 368
 369     // The installation date should not have been affected.
 370     EXPECT_EQ(previous_client_info->installation_date,
 371               prefs_.GetInt64(prefs::kInstallDate));
 372
 373     // The metrics-reporting-enabled date will be reset to Now().
 374     EXPECT_GE(prefs_.GetInt64(prefs::kMetricsReportingEnabledTimestamp),
 375               previous_client_info->reporting_enabled_date);
 376
 377     stored_client_info_backup_.reset();
 378   }
 379 }
 380
 381 }  // namespace metrics