chrome/common/variations/variations_util.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 "chrome/common/variations/variations_util.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/metrics/field_trial.h"
  11 #include "base/strings/string_split.h"
  12 #include "chrome/common/crash_keys.h"
  13 #include "chrome/common/variations/fieldtrial_testing_config.h"
  14 #include "components/variations/active_field_trials.h"
  15 #include "components/variations/variations_associated_data.h"
  16 #include "net/base/escape.h"
  17
  18 namespace chrome_variations {
  19
  20 namespace {
  21
  22 std::string EscapeValue(const std::string& value) {
  23   return net::UnescapeURLComponent(value, net::UnescapeRule::URL_SPECIAL_CHARS);
  24 }
  25
  26 } // namespace
  27
  28 void SetChildProcessLoggingVariationList() {
  29   std::vector<std::string> experiment_strings;
  30   variations::GetFieldTrialActiveGroupIdsAsStrings(&experiment_strings);
  31   crash_keys::SetVariationsList(experiment_strings);
  32 }
  33
  34 bool AssociateParamsFromString(const std::string& varations_string) {
  35   // Format: Trial1.Group1:k1/v1/k2/v2,Trial2.Group2:k1/v1/k2/v2
  36   for (const base::StringPiece& experiment_group : base::SplitStringPiece(
  37            varations_string, ",",
  38            base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
  39     std::vector<base::StringPiece> experiment = base::SplitStringPiece(
  40         experiment_group, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
  41     if (experiment.size() != 2)
  42       return false;
  43
  44     std::vector<std::string> group_parts = base::SplitString(
  45         experiment[0], ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
  46     if (group_parts.size() != 2)
  47       return false;
  48
  49     std::vector<std::string> key_values = base::SplitString(
  50         experiment[1], "/", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
  51     if (key_values.size() % 2 != 0)
  52       return false;
  53
  54     std::map<std::string, std::string> params;
  55     for (size_t i = 0; i < key_values.size(); i += 2) {
  56       std::string key = EscapeValue(key_values[i]);
  57       std::string value = EscapeValue(key_values[i + 1]);
  58       params[key] = value;
  59     }
  60     std::string trial = EscapeValue(group_parts[0]);
  61     std::string group = EscapeValue(group_parts[1]);
  62     variations::AssociateVariationParams(trial, group, params);
  63   }
  64   return true;
  65 }
  66
  67 void AssociateParamsFromFieldTrialConfig(
  68     const FieldTrialTestingConfig& config) {
  69   for (size_t i = 0; i < config.groups_size; ++i) {
  70     const FieldTrialTestingGroup& group = config.groups[i];
  71     if (group.params_size != 0) {
  72       std::map<std::string, std::string> params;
  73       for (size_t j = 0; j < group.params_size; ++j) {
  74         const FieldTrialGroupParams& param = group.params[j];
  75         params[param.key] = param.value;
  76       }
  77       variations::AssociateVariationParams(group.study, group.group_name,
  78                                            params);
  79     }
  80     base::FieldTrialList::CreateFieldTrial(group.study, group.group_name);
  81   }
  82 }
  83
  84 void AssociateDefaultFieldTrialConfig() {
  85   AssociateParamsFromFieldTrialConfig(kFieldTrialConfig);
  86 }
  87
  88 }  // namespace chrome_variations