src/chrome/browser/profile_resetter/automatic_profile_resetter.cc

   1 // Copyright 2013 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/profile_resetter/automatic_profile_resetter.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/logging.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/metrics/field_trial.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/metrics/sparse_histogram.h"
  14 #include "base/prefs/pref_service.h"
  15 #include "base/strings/string_number_conversions.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/task_runner.h"
  18 #include "base/task_runner_util.h"
  19 #include "base/threading/sequenced_worker_pool.h"
  20 #include "base/time/time.h"
  21 #include "base/timer/elapsed_timer.h"
  22 #include "base/values.h"
  23 #include "chrome/browser/browser_process.h"
  24 #include "chrome/browser/profile_resetter/automatic_profile_resetter_delegate.h"
  25 #include "chrome/browser/profile_resetter/jtl_interpreter.h"
  26 #include "chrome/browser/profiles/profile.h"
  27 #include "chrome/browser/search_engines/template_url_service.h"
  28 #include "chrome/browser/search_engines/template_url_service_factory.h"
  29 #include "components/variations/variations_associated_data.h"
  30 #include "content/public/browser/browser_thread.h"
  31 #include "grit/browser_resources.h"
  32 #include "ui/base/resource/resource_bundle.h"
  33
  34
  35 // Helpers -------------------------------------------------------------------
  36
  37 namespace {
  38
  39 // Name constants for the field trial behind which we enable this feature.
  40 const char kAutomaticProfileResetStudyName[] = "AutomaticProfileReset";
  41 const char kAutomaticProfileResetStudyDryRunGroupName[] = "DryRun";
  42 const char kAutomaticProfileResetStudyEnabledGroupName[] = "Enabled";
  43 #if defined(GOOGLE_CHROME_BUILD)
  44 const char kAutomaticProfileResetStudyProgramParameterName[] = "program";
  45 const char kAutomaticProfileResetStudyHashSeedParameterName[] = "hash_seed";
  46 #endif
  47
  48 // How long to wait after start-up before unleashing the evaluation flow.
  49 const int64 kEvaluationFlowDelayInSeconds = 55;
  50
  51 // Keys used in the input dictionary of the program.
  52 const char kDefaultSearchProviderKey[] = "default_search_provider";
  53 const char kDefaultSearchProviderIsUserControlledKey[] =
  54     "default_search_provider_iuc";
  55 const char kLoadedModuleDigestsKey[] = "loaded_modules";
  56 const char kLocalStateKey[] = "local_state";
  57 const char kLocalStateIsUserControlledKey[] = "local_state_iuc";
  58 const char kSearchProvidersKey[] = "search_providers";
  59 const char kUserPreferencesKey[] = "preferences";
  60 const char kUserPreferencesIsUserControlledKey[] = "preferences_iuc";
  61
  62 // Keys used in the output dictionary of the program.
  63 const char kCombinedStatusMaskKeyPrefix[] = "combined_status_mask_bit";
  64 const char kHadPromptedAlreadyKey[] = "had_prompted_already";
  65 const char kShouldPromptKey[] = "should_prompt";
  66 const char kSatisfiedCriteriaMaskKeyPrefix[] = "satisfied_criteria_mask_bit";
  67
  68 // Keys used in both the input and output dictionary of the program.
  69 const char kMementoValueInFileKey[] = "memento_value_in_file";
  70 const char kMementoValueInLocalStateKey[] = "memento_value_in_local_state";
  71 const char kMementoValueInPrefsKey[] = "memento_value_in_prefs";
  72
  73 // Number of bits, and maximum value (exclusive) for the mask whose bits
  74 // indicate which of reset criteria were satisfied.
  75 const size_t kSatisfiedCriteriaMaskNumberOfBits = 5u;
  76 const uint32 kSatisfiedCriteriaMaskMaximumValue =
  77     (1u << kSatisfiedCriteriaMaskNumberOfBits);
  78
  79 // Number of bits, and maximum value (exclusive) for the mask whose bits
  80 // indicate if any of reset criteria were satisfied, and which of the mementos
  81 // were already present.
  82 const size_t kCombinedStatusMaskNumberOfBits = 4u;
  83 const uint32 kCombinedStatusMaskMaximumValue =
  84     (1u << kCombinedStatusMaskNumberOfBits);
  85
  86 // Returns whether or not a dry-run shall be performed.
  87 bool ShouldPerformDryRun() {
  88   return StartsWithASCII(
  89       base::FieldTrialList::FindFullName(kAutomaticProfileResetStudyName),
  90       kAutomaticProfileResetStudyDryRunGroupName, true);
  91 }
  92
  93 // Returns whether or not a live-run shall be performed.
  94 bool ShouldPerformLiveRun() {
  95   return StartsWithASCII(
  96       base::FieldTrialList::FindFullName(kAutomaticProfileResetStudyName),
  97       kAutomaticProfileResetStudyEnabledGroupName, true);
  98 }
  99
 100 // If the currently active experiment group prescribes a |program| and
 101 // |hash_seed| to use instead of the baked-in ones, retrieves those and returns
 102 // true. Otherwise, returns false.
 103 bool GetProgramAndHashSeedOverridesFromExperiment(std::string* program,
 104                                                   std::string* hash_seed) {
 105   DCHECK(program);
 106   DCHECK(hash_seed);
 107 #if defined(GOOGLE_CHROME_BUILD)
 108   std::map<std::string, std::string> params;
 109   chrome_variations::GetVariationParams(kAutomaticProfileResetStudyName,
 110                                         &params);
 111   if (params.count(kAutomaticProfileResetStudyProgramParameterName) &&
 112       params.count(kAutomaticProfileResetStudyHashSeedParameterName)) {
 113     program->swap(params[kAutomaticProfileResetStudyProgramParameterName]);
 114     hash_seed->swap(params[kAutomaticProfileResetStudyHashSeedParameterName]);
 115     return true;
 116   }
 117 #endif
 118   return false;
 119 }
 120
 121 // Takes |pref_name_to_value_map|, which shall be a deep-copy of all preferences
 122 // in |source| without path expansion; and (1.) creates a sub-tree from it named
 123 // |value_tree_key| in |target_dictionary| with path expansion, and (2.) also
 124 // creates an isomorphic sub-tree under the key |is_user_controlled_tree_key|
 125 // that contains only Boolean values indicating whether or not the corresponding
 126 // preference is coming from the 'user' PrefStore.
 127 void BuildSubTreesFromPreferences(
 128     scoped_ptr<base::DictionaryValue> pref_name_to_value_map,
 129     const PrefService* source,
 130     const char* value_tree_key,
 131     const char* is_user_controlled_tree_key,
 132     base::DictionaryValue* target_dictionary) {
 133   std::vector<std::string> pref_names;
 134   pref_names.reserve(pref_name_to_value_map->size());
 135   for (base::DictionaryValue::Iterator it(*pref_name_to_value_map);
 136        !it.IsAtEnd(); it.Advance())
 137     pref_names.push_back(it.key());
 138
 139   base::DictionaryValue* value_tree = new base::DictionaryValue;
 140   base::DictionaryValue* is_user_controlled_tree = new base::DictionaryValue;
 141   for (std::vector<std::string>::const_iterator it = pref_names.begin();
 142        it != pref_names.end(); ++it) {
 143     scoped_ptr<base::Value> pref_value_owned;
 144     if (pref_name_to_value_map->RemoveWithoutPathExpansion(*it,
 145                                                            &pref_value_owned)) {
 146       value_tree->Set(*it, pref_value_owned.release());
 147       const PrefService::Preference* pref = source->FindPreference(it->c_str());
 148       is_user_controlled_tree->Set(
 149           *it, new base::FundamentalValue(pref->IsUserControlled()));
 150     }
 151   }
 152   target_dictionary->Set(value_tree_key, value_tree);
 153   target_dictionary->Set(is_user_controlled_tree_key, is_user_controlled_tree);
 154 }
 155
 156 }  // namespace
 157
 158
 159 // AutomaticProfileResetter::InputBuilder ------------------------------------
 160
 161 // Collects all the information that is required by the evaluator program to
 162 // assess whether or not the conditions for showing the reset prompt are met.
 163 //
 164 // This necessitates a lot of work that has to be performed on the UI thread,
 165 // such as: accessing the Preferences, Local State, and TemplateURLService.
 166 // In order to keep the browser responsive, the UI thread shall not be blocked
 167 // for long consecutive periods of time. Unfortunately, we cannot reduce the
 168 // total amount of work. Instead, what this class does is to split the work into
 169 // shorter tasks that are posted one-at-a-time to the UI thread in a serial
 170 // fashion, so as to give a chance to run other tasks that have accumulated in
 171 // the meantime.
 172 class AutomaticProfileResetter::InputBuilder
 173     : public base::SupportsWeakPtr<InputBuilder> {
 174  public:
 175   typedef base::Callback<void(scoped_ptr<base::DictionaryValue>)>
 176       ProgramInputCallback;
 177
 178   // The dependencies must have been initialized through |delegate|, i.e. the
 179   // RequestCallback[...] methods must have already fired before calling this.
 180   InputBuilder(Profile* profile, AutomaticProfileResetterDelegate* delegate)
 181       : profile_(profile),
 182         delegate_(delegate),
 183         memento_in_prefs_(profile_),
 184         memento_in_local_state_(profile_),
 185         memento_in_file_(profile_) {}
 186   ~InputBuilder() {}
 187
 188   // Assembles the data required by the evaluator program into a dictionary
 189   // format, and posts it back to the UI thread with |callback| once ready. In
 190   // order not to block the UI thread for long consecutive periods of time, the
 191   // work is divided into smaller tasks, see class comment above for details.
 192   // It is safe to destroy |this| immediately from within the |callback|.
 193   void BuildEvaluatorProgramInput(const ProgramInputCallback& callback) {
 194     DCHECK(!data_);
 195     DCHECK(!callback.is_null());
 196     data_.reset(new base::DictionaryValue);
 197     callback_ = callback;
 198
 199     AddAsyncTask(base::Bind(&InputBuilder::IncludeMementoValues, AsWeakPtr()));
 200     AddTask(base::Bind(&InputBuilder::IncludeUserPreferences, AsWeakPtr()));
 201     AddTask(base::Bind(&InputBuilder::IncludeLocalState, AsWeakPtr()));
 202     AddTask(base::Bind(&InputBuilder::IncludeSearchEngines, AsWeakPtr()));
 203     AddTask(base::Bind(&InputBuilder::IncludeLoadedModules, AsWeakPtr()));
 204
 205     // Each task will post the next one. Just trigger the chain reaction.
 206     PostNextTask();
 207   }
 208
 209  private:
 210   // Asynchronous task that includes memento values (or empty strings in case
 211   // mementos are not there).
 212   void IncludeMementoValues() {
 213     data_->SetString(kMementoValueInPrefsKey, memento_in_prefs_.ReadValue());
 214     data_->SetString(kMementoValueInLocalStateKey,
 215                      memento_in_local_state_.ReadValue());
 216     memento_in_file_.ReadValue(base::Bind(
 217         &InputBuilder::IncludeFileBasedMementoCallback, AsWeakPtr()));
 218   }
 219
 220   // Called back by |memento_in_file_| once the |memento_value| has been read.
 221   void IncludeFileBasedMementoCallback(const std::string& memento_value) {
 222     DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 223     data_->SetString(kMementoValueInFileKey, memento_value);
 224     // As an asynchronous task, we need to take care of posting the next task.
 225     PostNextTask();
 226   }
 227
 228   // Task that includes all user (i.e. profile-specific) preferences, along with
 229   // information about whether the value is coming from the 'user' PrefStore.
 230   // This is the most expensive operation, so it is itself split into two parts.
 231   void IncludeUserPreferences() {
 232     PrefService* prefs = profile_->GetPrefs();
 233     DCHECK(prefs);
 234     scoped_ptr<base::DictionaryValue> pref_name_to_value_map(
 235         prefs->GetPreferenceValuesWithoutPathExpansion());
 236     AddTask(base::Bind(&InputBuilder::IncludeUserPreferencesPartTwo,
 237                        AsWeakPtr(),
 238                        base::Passed(&pref_name_to_value_map)));
 239   }
 240
 241   // Second part to above.
 242   void IncludeUserPreferencesPartTwo(
 243       scoped_ptr<base::DictionaryValue> pref_name_to_value_map) {
 244     PrefService* prefs = profile_->GetPrefs();
 245     DCHECK(prefs);
 246     BuildSubTreesFromPreferences(
 247         pref_name_to_value_map.Pass(),
 248         prefs,
 249         kUserPreferencesKey,
 250         kUserPreferencesIsUserControlledKey,
 251         data_.get());
 252   }
 253
 254   // Task that includes all local state (i.e. shared) preferences, along with
 255   // information about whether the value is coming from the 'user' PrefStore.
 256   void IncludeLocalState() {
 257     PrefService* local_state = g_browser_process->local_state();
 258     DCHECK(local_state);
 259     scoped_ptr<base::DictionaryValue> pref_name_to_value_map(
 260         local_state->GetPreferenceValuesWithoutPathExpansion());
 261     BuildSubTreesFromPreferences(
 262         pref_name_to_value_map.Pass(),
 263         local_state,
 264         kLocalStateKey,
 265         kLocalStateIsUserControlledKey,
 266         data_.get());
 267   }
 268
 269   // Task that includes all information related to search engines.
 270   void IncludeSearchEngines() {
 271     scoped_ptr<base::DictionaryValue> default_search_provider_details(
 272         delegate_->GetDefaultSearchProviderDetails());
 273     data_->Set(kDefaultSearchProviderKey,
 274                default_search_provider_details.release());
 275
 276     scoped_ptr<base::ListValue> search_providers_details(
 277         delegate_->GetPrepopulatedSearchProvidersDetails());
 278     data_->Set(kSearchProvidersKey, search_providers_details.release());
 279
 280     data_->SetBoolean(kDefaultSearchProviderIsUserControlledKey,
 281                       !delegate_->IsDefaultSearchProviderManaged());
 282   }
 283
 284   // Task that includes information about loaded modules.
 285   void IncludeLoadedModules() {
 286     scoped_ptr<base::ListValue> loaded_module_digests(
 287         delegate_->GetLoadedModuleNameDigests());
 288     data_->Set(kLoadedModuleDigestsKey, loaded_module_digests.release());
 289   }
 290
 291   // -------------------------------------------------------------------------
 292
 293   // Adds a |task| that can do as much asynchronous processing as it wants, but
 294   // will need to finally call PostNextTask() on the UI thread when done.
 295   void AddAsyncTask(const base::Closure& task) {
 296     task_queue_.push(task);
 297   }
 298
 299   // Convenience wrapper for synchronous tasks.
 300   void SynchronousTaskWrapper(const base::Closure& task) {
 301     base::ElapsedTimer timer;
 302     task.Run();
 303     UMA_HISTOGRAM_CUSTOM_TIMES(
 304         "AutomaticProfileReset.InputBuilder.TaskDuration",
 305         timer.Elapsed(),
 306         base::TimeDelta::FromMilliseconds(1),
 307         base::TimeDelta::FromSeconds(2),
 308         50);
 309     PostNextTask();
 310   }
 311
 312   // Adds a task that needs to finish synchronously. In exchange, PostNextTask()
 313   // is called automatically when the |task| returns, and execution time is
 314   // measured.
 315   void AddTask(const base::Closure& task) {
 316     task_queue_.push(
 317         base::Bind(&InputBuilder::SynchronousTaskWrapper, AsWeakPtr(), task));
 318   }
 319
 320   // Posts the next task from the |task_queue_|, unless it is exhausted, in
 321   // which case it posts |callback_| to return with the results.
 322   void PostNextTask() {
 323     base::Closure next_task;
 324     if (task_queue_.empty()) {
 325       next_task = base::Bind(callback_, base::Passed(&data_));
 326     } else {
 327       next_task = task_queue_.front();
 328       task_queue_.pop();
 329     }
 330     content::BrowserThread::PostTask(
 331         content::BrowserThread::UI, FROM_HERE, next_task);
 332   }
 333
 334   Profile* profile_;
 335   AutomaticProfileResetterDelegate* delegate_;
 336   ProgramInputCallback callback_;
 337
 338   PreferenceHostedPromptMemento memento_in_prefs_;
 339   LocalStateHostedPromptMemento memento_in_local_state_;
 340   FileHostedPromptMemento memento_in_file_;
 341
 342   scoped_ptr<base::DictionaryValue> data_;
 343   std::queue<base::Closure> task_queue_;
 344
 345   DISALLOW_COPY_AND_ASSIGN(InputBuilder);
 346 };
 347
 348
 349 // AutomaticProfileResetter::EvaluationResults -------------------------------
 350
 351 // Encapsulates the output values extracted from the evaluator program.
 352 struct AutomaticProfileResetter::EvaluationResults {
 353   EvaluationResults()
 354       : should_prompt(false),
 355         had_prompted_already(false),
 356         satisfied_criteria_mask(0),
 357         combined_status_mask(0) {}
 358
 359   std::string memento_value_in_prefs;
 360   std::string memento_value_in_local_state;
 361   std::string memento_value_in_file;
 362
 363   bool should_prompt;
 364   bool had_prompted_already;
 365   uint32 satisfied_criteria_mask;
 366   uint32 combined_status_mask;
 367 };
 368
 369
 370 // AutomaticProfileResetter --------------------------------------------------
 371
 372 AutomaticProfileResetter::AutomaticProfileResetter(Profile* profile)
 373     : profile_(profile),
 374       state_(STATE_UNINITIALIZED),
 375       enumeration_of_loaded_modules_ready_(false),
 376       template_url_service_ready_(false),
 377       has_already_dismissed_prompt_(false),
 378       should_show_reset_banner_(false),
 379       weak_ptr_factory_(this) {
 380   DCHECK(profile_);
 381 }
 382
 383 AutomaticProfileResetter::~AutomaticProfileResetter() {}
 384
 385 void AutomaticProfileResetter::Initialize() {
 386   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 387   DCHECK_EQ(state_, STATE_UNINITIALIZED);
 388
 389   if (!ShouldPerformDryRun() && !ShouldPerformLiveRun()) {
 390     state_ = STATE_DISABLED;
 391     return;
 392   }
 393
 394   if (!GetProgramAndHashSeedOverridesFromExperiment(&program_, &hash_seed_)) {
 395     ui::ResourceBundle& resources(ui::ResourceBundle::GetSharedInstance());
 396     if (ShouldPerformLiveRun()) {
 397       program_ = resources.GetRawDataResource(
 398           IDR_AUTOMATIC_PROFILE_RESET_RULES).as_string();
 399       hash_seed_ = resources.GetRawDataResource(
 400           IDR_AUTOMATIC_PROFILE_RESET_HASH_SEED).as_string();
 401     } else {  // ShouldPerformDryRun()
 402       program_ = resources.GetRawDataResource(
 403           IDR_AUTOMATIC_PROFILE_RESET_RULES_DRY).as_string();
 404       hash_seed_ = resources.GetRawDataResource(
 405           IDR_AUTOMATIC_PROFILE_RESET_HASH_SEED_DRY).as_string();
 406     }
 407   }
 408
 409   delegate_.reset(new AutomaticProfileResetterDelegateImpl(
 410       profile_, ProfileResetter::ALL));
 411   task_runner_for_waiting_ =
 412       content::BrowserThread::GetMessageLoopProxyForThread(
 413           content::BrowserThread::UI);
 414
 415   state_ = STATE_INITIALIZED;
 416 }
 417
 418 void AutomaticProfileResetter::Activate() {
 419   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 420   DCHECK(state_ == STATE_INITIALIZED || state_ == STATE_DISABLED);
 421
 422   if (state_ == STATE_INITIALIZED) {
 423     if (!program_.empty()) {
 424       // Some steps in the flow (e.g. loaded modules, file-based memento) are
 425       // IO-intensive, so defer execution until some time later.
 426       task_runner_for_waiting_->PostDelayedTask(
 427           FROM_HERE,
 428           base::Bind(&AutomaticProfileResetter::PrepareEvaluationFlow,
 429                      weak_ptr_factory_.GetWeakPtr()),
 430           base::TimeDelta::FromSeconds(kEvaluationFlowDelayInSeconds));
 431     } else {
 432       // Terminate early if there is no program included (nor set by tests).
 433       state_ = STATE_DISABLED;
 434     }
 435   }
 436 }
 437
 438 void AutomaticProfileResetter::TriggerProfileReset(bool send_feedback) {
 439   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 440   DCHECK_EQ(state_, STATE_HAS_SHOWN_BUBBLE);
 441
 442   state_ = STATE_PERFORMING_RESET;
 443   should_show_reset_banner_ = false;
 444
 445   ReportPromptResult(PROMPT_ACTION_RESET);
 446   delegate_->TriggerProfileSettingsReset(
 447       send_feedback,
 448       base::Bind(&AutomaticProfileResetter::OnProfileSettingsResetCompleted,
 449                  weak_ptr_factory_.GetWeakPtr()));
 450 }
 451
 452 void AutomaticProfileResetter::SkipProfileReset() {
 453   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 454   DCHECK_EQ(state_, STATE_HAS_SHOWN_BUBBLE);
 455
 456   should_show_reset_banner_ = false;
 457
 458   ReportPromptResult(PROMPT_ACTION_NO_RESET);
 459   delegate_->DismissPrompt();
 460   FinishResetPromptFlow();
 461 }
 462
 463 bool AutomaticProfileResetter::IsResetPromptFlowActive() const {
 464   return state_ == STATE_HAS_TRIGGERED_PROMPT ||
 465       state_ == STATE_HAS_SHOWN_BUBBLE;
 466 }
 467
 468 bool AutomaticProfileResetter::ShouldShowResetBanner() const {
 469   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 470   return should_show_reset_banner_ && ShouldPerformLiveRun();
 471 }
 472
 473 void AutomaticProfileResetter::NotifyDidShowResetBubble() {
 474   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 475   DCHECK_EQ(state_, STATE_HAS_TRIGGERED_PROMPT);
 476
 477   state_ = STATE_HAS_SHOWN_BUBBLE;
 478
 479   PersistMementos();
 480   ReportPromptResult(PROMPT_SHOWN_BUBBLE);
 481 }
 482
 483 void AutomaticProfileResetter::NotifyDidOpenWebUIResetDialog() {
 484   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 485
 486   // This notification is invoked unconditionally by the WebUI, only care about
 487   // it when the prompt flow is currently active (and not yet resetting).
 488   if (state_ == STATE_HAS_TRIGGERED_PROMPT ||
 489       state_ == STATE_HAS_SHOWN_BUBBLE) {
 490     has_already_dismissed_prompt_ = true;
 491     delegate_->DismissPrompt();
 492   }
 493 }
 494
 495 void AutomaticProfileResetter::NotifyDidCloseWebUIResetDialog(
 496     bool performed_reset) {
 497   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 498
 499   // This notification is invoked unconditionally by the WebUI, only care about
 500   // it when the prompt flow is currently active (and not yet resetting).
 501   if (state_ == STATE_HAS_TRIGGERED_PROMPT ||
 502       state_ == STATE_HAS_SHOWN_BUBBLE) {
 503     if (!has_already_dismissed_prompt_)
 504       delegate_->DismissPrompt();
 505     if (state_ == STATE_HAS_TRIGGERED_PROMPT) {
 506       PersistMementos();
 507       ReportPromptResult(performed_reset ?
 508           PROMPT_NOT_SHOWN_BUBBLE_BUT_HAD_WEBUI_RESET :
 509           PROMPT_NOT_SHOWN_BUBBLE_BUT_HAD_WEBUI_NO_RESET);
 510     } else {  // if (state_ == STATE_HAS_SHOWN_PROMPT)
 511       ReportPromptResult(performed_reset ?
 512           PROMPT_FOLLOWED_BY_WEBUI_RESET :
 513           PROMPT_FOLLOWED_BY_WEBUI_NO_RESET);
 514     }
 515     FinishResetPromptFlow();
 516   }
 517 }
 518
 519 void AutomaticProfileResetter::NotifyDidCloseWebUIResetBanner() {
 520   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 521   should_show_reset_banner_ = false;
 522 }
 523
 524 void AutomaticProfileResetter::SetProgramForTesting(
 525     const std::string& program) {
 526   program_ = program;
 527 }
 528
 529 void AutomaticProfileResetter::SetHashSeedForTesting(
 530     const std::string& hash_key) {
 531   hash_seed_ = hash_key;
 532 }
 533
 534 void AutomaticProfileResetter::SetDelegateForTesting(
 535     scoped_ptr<AutomaticProfileResetterDelegate> delegate) {
 536   delegate_ = delegate.Pass();
 537 }
 538
 539 void AutomaticProfileResetter::SetTaskRunnerForWaitingForTesting(
 540     const scoped_refptr<base::TaskRunner>& task_runner) {
 541   task_runner_for_waiting_ = task_runner;
 542 }
 543
 544 void AutomaticProfileResetter::Shutdown() {
 545   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 546
 547   // We better not do anything substantial at this point. The metrics service
 548   // has already been shut down; and local state has already been commited to
 549   // file (in the regular fashion) for the last time.
 550
 551   state_ = STATE_DISABLED;
 552
 553   weak_ptr_factory_.InvalidateWeakPtrs();
 554   delegate_.reset();
 555 }
 556
 557 void AutomaticProfileResetter::PrepareEvaluationFlow() {
 558   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 559   DCHECK_EQ(state_, STATE_INITIALIZED);
 560
 561   state_ = STATE_WAITING_ON_DEPENDENCIES;
 562
 563   delegate_->RequestCallbackWhenTemplateURLServiceIsLoaded(
 564       base::Bind(&AutomaticProfileResetter::OnTemplateURLServiceIsLoaded,
 565                  weak_ptr_factory_.GetWeakPtr()));
 566   delegate_->RequestCallbackWhenLoadedModulesAreEnumerated(
 567       base::Bind(&AutomaticProfileResetter::OnLoadedModulesAreEnumerated,
 568                  weak_ptr_factory_.GetWeakPtr()));
 569   delegate_->LoadTemplateURLServiceIfNeeded();
 570   delegate_->EnumerateLoadedModulesIfNeeded();
 571 }
 572
 573 void AutomaticProfileResetter::OnTemplateURLServiceIsLoaded() {
 574   template_url_service_ready_ = true;
 575   OnDependencyIsReady();
 576 }
 577
 578 void AutomaticProfileResetter::OnLoadedModulesAreEnumerated() {
 579   enumeration_of_loaded_modules_ready_ = true;
 580   OnDependencyIsReady();
 581 }
 582
 583 void AutomaticProfileResetter::OnDependencyIsReady() {
 584   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 585   DCHECK_EQ(state_, STATE_WAITING_ON_DEPENDENCIES);
 586
 587   if (template_url_service_ready_ && enumeration_of_loaded_modules_ready_) {
 588     state_ = STATE_READY;
 589     content::BrowserThread::PostTask(
 590         content::BrowserThread::UI,
 591         FROM_HERE,
 592         base::Bind(&AutomaticProfileResetter::BeginEvaluationFlow,
 593                    weak_ptr_factory_.GetWeakPtr()));
 594   }
 595 }
 596
 597 void AutomaticProfileResetter::BeginEvaluationFlow() {
 598   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 599   DCHECK_EQ(state_, STATE_READY);
 600   DCHECK(!program_.empty());
 601   DCHECK(!input_builder_);
 602
 603   state_ = STATE_EVALUATING_CONDITIONS;
 604
 605   input_builder_.reset(new InputBuilder(profile_, delegate_.get()));
 606   input_builder_->BuildEvaluatorProgramInput(
 607       base::Bind(&AutomaticProfileResetter::ContinueWithEvaluationFlow,
 608                  weak_ptr_factory_.GetWeakPtr()));
 609 }
 610
 611 void AutomaticProfileResetter::ContinueWithEvaluationFlow(
 612     scoped_ptr<base::DictionaryValue> program_input) {
 613   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 614   DCHECK_EQ(state_, STATE_EVALUATING_CONDITIONS);
 615
 616   input_builder_.reset();
 617
 618   base::SequencedWorkerPool* blocking_pool =
 619       content::BrowserThread::GetBlockingPool();
 620   scoped_refptr<base::TaskRunner> task_runner =
 621       blocking_pool->GetTaskRunnerWithShutdownBehavior(
 622           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 623
 624   base::PostTaskAndReplyWithResult(
 625       task_runner.get(),
 626       FROM_HERE,
 627       base::Bind(&EvaluateConditionsOnWorkerPoolThread,
 628                  hash_seed_,
 629                  program_,
 630                  base::Passed(&program_input)),
 631       base::Bind(&AutomaticProfileResetter::FinishEvaluationFlow,
 632                  weak_ptr_factory_.GetWeakPtr()));
 633 }
 634
 635 // static
 636 scoped_ptr<AutomaticProfileResetter::EvaluationResults>
 637     AutomaticProfileResetter::EvaluateConditionsOnWorkerPoolThread(
 638     const std::string& hash_seed,
 639     const std::string& program,
 640     scoped_ptr<base::DictionaryValue> program_input) {
 641   JtlInterpreter interpreter(hash_seed, program, program_input.get());
 642   interpreter.Execute();
 643   UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.InterpreterResult",
 644                             interpreter.result(),
 645                             JtlInterpreter::RESULT_MAX);
 646   UMA_HISTOGRAM_SPARSE_SLOWLY("AutomaticProfileReset.ProgramChecksum",
 647                               interpreter.CalculateProgramChecksum());
 648
 649   // In each case below, the respective field in result originally contains the
 650   // default, so if the getter fails, we still have the correct value there.
 651   scoped_ptr<EvaluationResults> results(new EvaluationResults);
 652   interpreter.GetOutputBoolean(kShouldPromptKey, &results->should_prompt);
 653   interpreter.GetOutputBoolean(kHadPromptedAlreadyKey,
 654                                &results->had_prompted_already);
 655   interpreter.GetOutputString(kMementoValueInPrefsKey,
 656                               &results->memento_value_in_prefs);
 657   interpreter.GetOutputString(kMementoValueInLocalStateKey,
 658                               &results->memento_value_in_local_state);
 659   interpreter.GetOutputString(kMementoValueInFileKey,
 660                               &results->memento_value_in_file);
 661   for (size_t i = 0; i < kCombinedStatusMaskNumberOfBits; ++i) {
 662     bool flag = false;
 663     std::string mask_i_th_bit_key =
 664         kCombinedStatusMaskKeyPrefix + base::IntToString(i + 1);
 665     if (interpreter.GetOutputBoolean(mask_i_th_bit_key, &flag) && flag)
 666       results->combined_status_mask |= (1 << i);
 667   }
 668   for (size_t i = 0; i < kSatisfiedCriteriaMaskNumberOfBits; ++i) {
 669     bool flag = false;
 670     std::string mask_i_th_bit_key =
 671         kSatisfiedCriteriaMaskKeyPrefix + base::IntToString(i + 1);
 672     if (interpreter.GetOutputBoolean(mask_i_th_bit_key, &flag) && flag)
 673       results->satisfied_criteria_mask |= (1 << i);
 674   }
 675   return results.Pass();
 676 }
 677
 678 void AutomaticProfileResetter::ReportStatistics(uint32 satisfied_criteria_mask,
 679                                                 uint32 combined_status_mask) {
 680   UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.SatisfiedCriteriaMask",
 681                             satisfied_criteria_mask,
 682                             kSatisfiedCriteriaMaskMaximumValue);
 683   UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.CombinedStatusMask",
 684                             combined_status_mask,
 685                             kCombinedStatusMaskMaximumValue);
 686 }
 687
 688 void AutomaticProfileResetter::FinishEvaluationFlow(
 689     scoped_ptr<EvaluationResults> results) {
 690   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 691   DCHECK_EQ(state_, STATE_EVALUATING_CONDITIONS);
 692
 693   ReportStatistics(results->satisfied_criteria_mask,
 694                    results->combined_status_mask);
 695
 696   if (results->should_prompt)
 697     should_show_reset_banner_ = true;
 698
 699   if (results->should_prompt && !results->had_prompted_already) {
 700     evaluation_results_ = results.Pass();
 701     BeginResetPromptFlow();
 702   } else {
 703     state_ = STATE_DONE;
 704   }
 705 }
 706
 707 void AutomaticProfileResetter::BeginResetPromptFlow() {
 708   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 709   DCHECK_EQ(state_, STATE_EVALUATING_CONDITIONS);
 710
 711   state_ = STATE_HAS_TRIGGERED_PROMPT;
 712
 713   if (ShouldPerformLiveRun() && delegate_->TriggerPrompt()) {
 714     // Start fetching the brandcoded default settings speculatively in the
 715     // background, so as to reduce waiting time if the user chooses to go
 716     // through with the reset.
 717     delegate_->FetchBrandcodedDefaultSettingsIfNeeded();
 718   } else {
 719     PersistMementos();
 720     ReportPromptResult(PROMPT_NOT_TRIGGERED);
 721     FinishResetPromptFlow();
 722   }
 723 }
 724
 725 void AutomaticProfileResetter::OnProfileSettingsResetCompleted() {
 726   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 727   DCHECK_EQ(state_, STATE_PERFORMING_RESET);
 728
 729   delegate_->DismissPrompt();
 730   FinishResetPromptFlow();
 731 }
 732
 733 void AutomaticProfileResetter::ReportPromptResult(PromptResult result) {
 734   UMA_HISTOGRAM_ENUMERATION(
 735       "AutomaticProfileReset.PromptResult", result, PROMPT_RESULT_MAX);
 736 }
 737
 738 void AutomaticProfileResetter::PersistMementos() {
 739   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 740   DCHECK(state_ == STATE_HAS_TRIGGERED_PROMPT ||
 741          state_ == STATE_HAS_SHOWN_BUBBLE);
 742   DCHECK(evaluation_results_);
 743
 744   PreferenceHostedPromptMemento memento_in_prefs(profile_);
 745   LocalStateHostedPromptMemento memento_in_local_state(profile_);
 746   FileHostedPromptMemento memento_in_file(profile_);
 747
 748   memento_in_prefs.StoreValue(evaluation_results_->memento_value_in_prefs);
 749   memento_in_local_state.StoreValue(
 750       evaluation_results_->memento_value_in_local_state);
 751   memento_in_file.StoreValue(evaluation_results_->memento_value_in_file);
 752
 753   evaluation_results_.reset();
 754 }
 755
 756 void AutomaticProfileResetter::FinishResetPromptFlow() {
 757   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 758   DCHECK(state_ == STATE_HAS_TRIGGERED_PROMPT ||
 759          state_ == STATE_HAS_SHOWN_BUBBLE ||
 760          state_ == STATE_PERFORMING_RESET);
 761   DCHECK(!evaluation_results_);
 762
 763   state_ = STATE_DONE;
 764 }