Added the AutomaticProfileResetter service.

chrome/browser/profile_resetter/automatic_profile_resetter.cc

Index: chrome/browser/profile_resetter/automatic_profile_resetter.cc
diff --git a/chrome/browser/profile_resetter/automatic_profile_resetter.cc b/chrome/browser/profile_resetter/automatic_profile_resetter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c0f7d252608a04107ed2dd37500e80b534f7384b
--- /dev/null
+++ b/chrome/browser/profile_resetter/automatic_profile_resetter.cc
@@ -0,0 +1,318 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/profile_resetter/automatic_profile_resetter.h"
+
+#include "base/bind_helpers.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/metrics/field_trial.h"
+#include "base/metrics/histogram.h"
+#include "base/prefs/pref_service.h"
+#include "base/task_runner.h"
+#include "base/task_runner_util.h"
+#include "base/threading/sequenced_worker_pool.h"
+#include "chrome/browser/profile_resetter/jtl_interpreter.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/public/browser/browser_thread.h"
+#include "grit/browser_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace {
+
+// Number of bits, and maximum value (exclusive) for the mask whose bits
+// indicate which of reset criteria were satisfied.
+const size_t kSatisfiedCriteriaMaskBits = 2;
+const uint32 kSatisfiedCriteriaMaskMaximumValue =
+    (1 << kSatisfiedCriteriaMaskBits);
+
+// Number of bits, and maximum value (exclusive) for the mask whose bits
+// indicate if any of reset criteria were satisfied, and which of the mementos
+// were already present.
+const size_t kCombinedStatusMaskBits = 4;
+const uint32 kCombinedStatusMaskMaximumValue = (1 << kCombinedStatusMaskBits);
+
+// Name constants for the field trial behind which we enable this feature.
+const char kAutomaticProfileResetStudyName[] = "AutomaticProfileReset";
+const char kAutomaticProfileResetStudyDryRunGroupName[] = "DryRun";
+const char kAutomaticProfileResetStudyEnabledGroupName[] = "Enabled";
+
+// Keys used in the input dictionary of the program.
+// TODO(engedy): Add these here on an as-needed basis.
+
+// Keys used in the output dictionary of the program.
+const char kHadPromptedAlreadyKey[] = "had_prompted_already";
+const char kSatisfiedCriteriaMaskKeys[][29] = {"satisfied_criteria_mask_bit1",
+                                               "satisfied_criteria_mask_bit2"};
+const char kCombinedStatusMaskKeys[][26] = {
+    "combined_status_mask_bit1", "combined_status_mask_bit2",
+    "combined_status_mask_bit3", "combined_status_mask_bit4"};
+
+// Keys used in both the input and output dictionary of the program.
+const char kMementoValueInPrefsKey[] = "memento_value_in_prefs";
+const char kMementoValueInLocalStateKey[] = "memento_value_in_local_state";
+const char kMementoValueInFileKey[] = "memento_value_in_file";
+
+COMPILE_ASSERT(
+    arraysize(kSatisfiedCriteriaMaskKeys) == kSatisfiedCriteriaMaskBits,
+    satisfied_criteria_mask_bits_mismatch);
+COMPILE_ASSERT(arraysize(kCombinedStatusMaskKeys) == kCombinedStatusMaskBits,
+               combined_status_mask_bits_mismatch);
+
+// Implementation detail classes ---------------------------------------------
+
+class AutomaticProfileResetterDelegateImpl
+    : public AutomaticProfileResetterDelegate {
+ public:
+  AutomaticProfileResetterDelegateImpl() {}
+  virtual ~AutomaticProfileResetterDelegateImpl() {}
+
+  // AutomaticProfileResetterDelegate overrides:
+
+  virtual void ShowPrompt() OVERRIDE {
+    // TODO(engedy): Call the UI from here once we have it.
+  }
+
+  virtual void ReportStatistics(uint32 satisfied_criteria_mask,
+                                uint32 combined_status_mask) OVERRIDE {
+    UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.SatisfiedCriteriaMask",
+                              satisfied_criteria_mask,
+                              kSatisfiedCriteriaMaskMaximumValue);
+    UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.CombinedStatusMask",
+                              combined_status_mask,
+                              kCombinedStatusMaskMaximumValue);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AutomaticProfileResetterDelegateImpl);
+};
+
+// Enumeration of the possible outcomes of showing the profile reset prompt.
+enum PromptResult {
+  // Prompt was not shown because only a dry-run was performed.
+  PROMPT_NOT_SHOWN,
+  PROMPT_ACTION_RESET,
+  PROMPT_ACTION_NO_RESET,
+  PROMPT_DISMISSED,
+  // Prompt was still shown (not dismissed by the user) when Chrome was closed.
+  PROMPT_IGNORED,
+  PROMPT_RESULT_MAX
+};
+
+}  // namespace
+
+// AutomaticProfileResetter::EvaluationResults -------------------------------
+
+// Encapsulates the output values extracted from the evaluator program.
+struct AutomaticProfileResetter::EvaluationResults {
+  EvaluationResults()
+      : had_prompted_already(false),
+        satisfied_criteria_mask(0),
+        combined_status_mask(0) {}
+
+  std::string memento_value_in_prefs;
+  std::string memento_value_in_local_state;
+  std::string memento_value_in_file;
+
+  bool had_prompted_already;
+  uint32 satisfied_criteria_mask;
+  uint32 combined_status_mask;
+};
+
+// AutomaticProfileResetter --------------------------------------------------
+
+AutomaticProfileResetter::AutomaticProfileResetter(Profile* profile)
+    : profile_(profile),
+      state_(STATE_UNINITIALIZED),
+      memento_in_prefs_(profile_),
+      memento_in_local_state_(profile_),
+      memento_in_file_(profile_),
+      weak_ptr_factory_(this) {
+  DCHECK(profile_);
+}
+
+AutomaticProfileResetter::~AutomaticProfileResetter() {}
+
+void AutomaticProfileResetter::Initialize() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_UNINITIALIZED);
+
+  if (ShouldPerformDryRun() || ShouldPerformLiveRun()) {
+    ui::ResourceBundle& resources(ui::ResourceBundle::GetSharedInstance());
+    if (ShouldPerformLiveRun()) {
+      program_ =
+          resources.GetRawDataResource(IDR_AUTOMATIC_PROFILE_RESET_RULES);
+      hash_seed_ =
+          resources.GetRawDataResource(IDR_AUTOMATIC_PROFILE_RESET_HASH_SEED);
+    } else {  // ShouldPerformDryRun()
+      program_ =
+          resources.GetRawDataResource(IDR_AUTOMATIC_PROFILE_RESET_RULES_DRY);
+      hash_seed_ = resources.GetRawDataResource(
+          IDR_AUTOMATIC_PROFILE_RESET_HASH_SEED_DRY);
+    }
+    delegate_.reset(new AutomaticProfileResetterDelegateImpl());
+
+    state_ = STATE_READY;
+
+    content::BrowserThread::PostTask(
+        content::BrowserThread::UI,
+        FROM_HERE,
+        base::Bind(&AutomaticProfileResetter::BeginEvaluationFlow,
+                   weak_ptr_factory_.GetWeakPtr()));
+  } else {
+    state_ = STATE_DISABLED;
+  }
+}
+
+bool AutomaticProfileResetter::ShouldPerformDryRun() const {
+  return base::FieldTrialList::FindFullName(kAutomaticProfileResetStudyName) ==
+         kAutomaticProfileResetStudyDryRunGroupName;
+}
+
+bool AutomaticProfileResetter::ShouldPerformLiveRun() const {
+  return base::FieldTrialList::FindFullName(kAutomaticProfileResetStudyName) ==
+         kAutomaticProfileResetStudyEnabledGroupName;
+}
+
+void AutomaticProfileResetter::BeginEvaluationFlow() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_READY);
+
+  if (!program_.empty()) {
+    state_ = STATE_WORKING;
+    memento_in_file_.ReadValue(
+        base::Bind(&AutomaticProfileResetter::ContinueWithEvaluationFlow,
+                   weak_ptr_factory_.GetWeakPtr()));
+  } else {
+    // Terminate early if there is no program included (nor set by tests).
+    state_ = STATE_DISABLED;
+  }
+}
+
+scoped_ptr<base::DictionaryValue>
+AutomaticProfileResetter::BuildEvaluatorProgramInput(
+    const std::string& memento_value_in_file) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  // TODO(engedy): Add any additional state here that is needed by the program.
+  scoped_ptr<base::DictionaryValue> input(new base::DictionaryValue);
+  input->SetString(kMementoValueInPrefsKey, memento_in_prefs_.ReadValue());
+  input->SetString(kMementoValueInLocalStateKey,
+                   memento_in_local_state_.ReadValue());
+  input->SetString(kMementoValueInFileKey, memento_value_in_file);
+  return input.Pass();
+}
+
+void AutomaticProfileResetter::ContinueWithEvaluationFlow(
+    const std::string& memento_value_in_file) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_WORKING);
+  PrefService* prefs = profile_->GetPrefs();
+  DCHECK(prefs);
+
+  scoped_ptr<base::DictionaryValue> input(
+      BuildEvaluatorProgramInput(memento_value_in_file));
+
+  base::SequencedWorkerPool* blocking_pool =
+      content::BrowserThread::GetBlockingPool();
+  scoped_refptr<base::TaskRunner> task_runner =
+      blocking_pool->GetTaskRunnerWithShutdownBehavior(
+          base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
+
+  base::PostTaskAndReplyWithResult(
+      task_runner.get(),
+      FROM_HERE,
+      base::Bind(&EvaluateConditionsOnWorkerPoolThread,
+                 hash_seed_,
+                 program_,
+                 base::Passed(&input)),
+      base::Bind(&AutomaticProfileResetter::FinishEvaluationFlow,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+// static
+scoped_ptr<AutomaticProfileResetter::EvaluationResults>
+AutomaticProfileResetter::EvaluateConditionsOnWorkerPoolThread(
+    const base::StringPiece& hash_seed,
+    const base::StringPiece& program,
+    scoped_ptr<base::DictionaryValue> program_input) {
+  std::string hash_seed_str(hash_seed.as_string());
+  std::string program_str(program.as_string());
+  JtlInterpreter interpreter(hash_seed_str, program_str, program_input.get());
+  interpreter.Execute();
+  UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.InterpreterResult",
+                            interpreter.result(),
+                            JtlInterpreter::RESULT_MAX);
+
+  // In each case below, the respective field in result originally contains the
+  // default, so if the getter fails, we still have the correct value there.
+  scoped_ptr<EvaluationResults> results(new EvaluationResults());
+  interpreter.GetOutputBoolean(kHadPromptedAlreadyKey,
+                               &results->had_prompted_already);
+  interpreter.GetOutputString(kMementoValueInPrefsKey,
+                              &results->memento_value_in_prefs);
+  interpreter.GetOutputString(kMementoValueInLocalStateKey,
+                              &results->memento_value_in_local_state);
+  interpreter.GetOutputString(kMementoValueInFileKey,
+                              &results->memento_value_in_file);
+  for (size_t i = 0; i < arraysize(kCombinedStatusMaskKeys); ++i) {
+    bool flag = false;
+    if (interpreter.GetOutputBoolean(kCombinedStatusMaskKeys[i], &flag) && flag)
+      results->combined_status_mask |= (1 << i);
+  }
+  for (size_t i = 0; i < arraysize(kSatisfiedCriteriaMaskKeys); ++i) {
+    bool flag = false;
+    if (interpreter.GetOutputBoolean(kSatisfiedCriteriaMaskKeys[i], &flag) &&
+        flag)
+      results->satisfied_criteria_mask |= (1 << i);
+  }
+  return results.Pass();
+}
+
+void AutomaticProfileResetter::FinishEvaluationFlow(
+    scoped_ptr<EvaluationResults> results) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_EQ(state_, STATE_WORKING);
+
+  delegate_->ReportStatistics(results->satisfied_criteria_mask,
+                              results->combined_status_mask);
+
+  if (results->satisfied_criteria_mask != 0 && !results->had_prompted_already) {
+    memento_in_prefs_.StoreValue(results->memento_value_in_prefs);
+    memento_in_local_state_.StoreValue(results->memento_value_in_local_state);
+    memento_in_file_.StoreValue(results->memento_value_in_file);
+
+    if (ShouldPerformLiveRun()) {
+      delegate_->ShowPrompt();
+    } else {
+      UMA_HISTOGRAM_ENUMERATION("AutomaticProfileReset.PromptResult",
+                                PROMPT_NOT_SHOWN,
+                                PROMPT_RESULT_MAX);
+    }
+  }
+
+  state_ = STATE_DONE;
+}
+
+void AutomaticProfileResetter::SetHashSeedForTesting(
+    const base::StringPiece& hash_key) {
+  hash_seed_ = hash_key;
+}
+
+void AutomaticProfileResetter::SetProgramForTesting(
+    const base::StringPiece& program) {
+  program_ = program;
+}
+
+void AutomaticProfileResetter::SetDelegateForTesting(
+    AutomaticProfileResetterDelegate* delegate) {
+  delegate_.reset(delegate);
+}
+
+void AutomaticProfileResetter::Shutdown() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  state_ = STATE_DISABLED;
+  delegate_.reset();
+  weak_ptr_factory_.InvalidateWeakPtrs();
+}