chrome/installer/gcapi/gcapi_omaha_experiment.cc

   1 // Copyright (c) 2012 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/installer/gcapi/gcapi_omaha_experiment.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/strings/string_split.h"
   9 #include "base/strings/string_util.h"
  10 #include "base/strings/stringprintf.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "base/time/time.h"
  13 #include "chrome/installer/gcapi/gcapi.h"
  14 #include "chrome/installer/util/google_update_constants.h"
  15 #include "chrome/installer/util/google_update_experiment_util.h"
  16 #include "chrome/installer/util/google_update_settings.h"
  17
  18 namespace {
  19
  20 // Returns the number of weeks since 2/3/2003.
  21 int GetCurrentRlzWeek(const base::Time& current_time) {
  22   base::Time::Exploded february_third_2003_exploded =
  23       {2003, 2, 1, 3, 0, 0, 0, 0};
  24   base::Time f = base::Time::FromUTCExploded(february_third_2003_exploded);
  25   base::TimeDelta delta = current_time - f;
  26   return delta.InDays() / 7;
  27 }
  28
  29 bool SetExperimentLabel(const wchar_t* brand_code,
  30                         const string16& label,
  31                         int shell_mode) {
  32   if (!brand_code) {
  33     return false;
  34   }
  35
  36   const bool system_level = shell_mode == GCAPI_INVOKED_UAC_ELEVATION;
  37
  38   string16 original_labels;
  39   if (!GoogleUpdateSettings::ReadExperimentLabels(system_level,
  40                                                   &original_labels)) {
  41     return false;
  42   }
  43
  44   // Split the original labels by the label separator.
  45   std::vector<string16> entries;
  46   base::SplitStringUsingSubstr(
  47       original_labels,
  48       ASCIIToUTF16(google_update::kExperimentLabelSep),
  49       &entries);
  50
  51   // Keep all labels, but the one we want to add/replace.
  52   string16 new_labels;
  53   for (std::vector<string16>::const_iterator it = entries.begin();
  54        it != entries.end(); ++it) {
  55     if (!it->empty() && !StartsWith(*it, label + L"=", true)) {
  56       new_labels += *it;
  57       new_labels += ASCIIToUTF16(google_update::kExperimentLabelSep);
  58     }
  59   }
  60
  61   new_labels.append(
  62       gcapi_internals::GetGCAPIExperimentLabel(brand_code, label));
  63
  64   return GoogleUpdateSettings::SetExperimentLabels(system_level,
  65                                                    new_labels);
  66 }
  67
  68 }  // namespace
  69
  70 namespace gcapi_internals {
  71
  72 const wchar_t kReactivationLabel[] = L"reacbrand";
  73 const wchar_t kRelaunchLabel[] = L"relaunchbrand";
  74
  75 string16 GetGCAPIExperimentLabel(const wchar_t* brand_code,
  76                                  const string16& label) {
  77   // Keeps a fixed time state for this GCAPI instance; this makes tests reliable
  78   // when crossing time boundaries on the system clock and doesn't otherwise
  79   // affect results of this short lived binary.
  80   static time_t instance_time_value = 0;
  81   if (instance_time_value == 0)
  82     instance_time_value = base::Time::Now().ToTimeT();
  83
  84   base::Time instance_time = base::Time::FromTimeT(instance_time_value);
  85
  86   string16 gcapi_experiment_label;
  87   base::SStringPrintf(&gcapi_experiment_label,
  88                       L"%ls=%ls_%d|%ls",
  89                       label.c_str(),
  90                       brand_code,
  91                       GetCurrentRlzWeek(instance_time),
  92                       installer::BuildExperimentDateString(
  93                           instance_time).c_str());
  94   return gcapi_experiment_label;
  95 }
  96
  97 }  // namespace gcapi_internals
  98
  99 bool SetReactivationExperimentLabels(const wchar_t* brand_code,
 100                                      int shell_mode) {
 101   return SetExperimentLabel(brand_code, gcapi_internals::kReactivationLabel,
 102                             shell_mode);
 103 }
 104
 105 bool SetRelaunchExperimentLabels(const wchar_t* brand_code, int shell_mode) {
 106   return SetExperimentLabel(brand_code, gcapi_internals::kRelaunchLabel,
 107                             shell_mode);
 108 }