chrome/browser/metrics/variations/variations_registry_syncer_win.cc

   1 // Copyright (c) 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/metrics/variations/variations_registry_syncer_win.h"
   6
   7 #include "base/files/file_path.h"
   8 #include "base/metrics/field_trial.h"
   9 #include "base/path_service.h"
  10 #include "base/strings/string16.h"
  11 #include "chrome/common/metrics/variations/experiment_labels.h"
  12 #include "chrome/installer/util/google_update_settings.h"
  13 #include "chrome/installer/util/install_util.h"
  14
  15 namespace {
  16
  17 // Delay before performing a registry sync, in seconds.
  18 const int kRegistrySyncDelaySeconds = 5;
  19
  20 }  // namespace
  21
  22 namespace chrome_variations {
  23
  24 VariationsRegistrySyncer::VariationsRegistrySyncer() {
  25 }
  26
  27 VariationsRegistrySyncer::~VariationsRegistrySyncer() {
  28 }
  29
  30 void VariationsRegistrySyncer::RequestRegistrySync() {
  31   if (timer_.IsRunning()) {
  32     timer_.Reset();
  33     return;
  34   }
  35
  36   timer_.Start(FROM_HERE,
  37                base::TimeDelta::FromSeconds(kRegistrySyncDelaySeconds),
  38                this, &VariationsRegistrySyncer::SyncWithRegistry);
  39 }
  40
  41 void VariationsRegistrySyncer::SyncWithRegistry() {
  42   // Note that all registry operations are done here on the UI thread as there
  43   // are no threading restrictions on them.
  44   base::FilePath chrome_exe;
  45   if (!PathService::Get(base::FILE_EXE, &chrome_exe)) {
  46     NOTREACHED() << "Failed to get chrome exe path";
  47     return;
  48   }
  49   const bool is_system_install =
  50       !InstallUtil::IsPerUserInstall(chrome_exe.value().c_str());
  51
  52   // Read the current bits from the registry.
  53   base::string16 registry_labels;
  54   bool success = GoogleUpdateSettings::ReadExperimentLabels(is_system_install,
  55                                                             &registry_labels);
  56   if (!success) {
  57     DVLOG(1) << "Error reading Variation labels from the registry.";
  58     return;
  59   }
  60
  61   // Since the non-Variations contents of experiment_labels should not be,
  62   // clobbered, separate them from the Variations contents.
  63   const base::string16 other_labels =
  64       ExtractNonVariationLabels(registry_labels);
  65
  66   // Compute the new Variations part of the label.
  67   base::FieldTrial::ActiveGroups active_groups;
  68   base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
  69   const base::string16 variation_labels =
  70       BuildGoogleUpdateExperimentLabel(active_groups);
  71
  72   // Append the old non-Variations labels with the new Variations labels and
  73   // write it back to the registry.
  74   const base::string16 combined_labels =
  75       CombineExperimentLabels(variation_labels, other_labels);
  76
  77   if (!GoogleUpdateSettings::SetExperimentLabels(is_system_install,
  78                                                  combined_labels)) {
  79     DVLOG(1) << "Error writing Variation labels to the registry: "
  80              << combined_labels;
  81   }
  82 }
  83
  84 }  // namespace chrome_variations