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