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      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 "components/variations/active_field_trials.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/strings/stringprintf.h"
     10 #include "base/strings/utf_string_conversions.h"
     11 #include "components/variations/metrics_util.h"
     12 
     13 namespace variations {
     14 
     15 namespace {
     16 
     17 // Populates |name_group_ids| based on |active_groups|.
     18 void GetFieldTrialActiveGroupIdsForActiveGroups(
     19     const base::FieldTrial::ActiveGroups& active_groups,
     20     std::vector<ActiveGroupId>* name_group_ids) {
     21   DCHECK(name_group_ids->empty());
     22   for (base::FieldTrial::ActiveGroups::const_iterator it =
     23        active_groups.begin(); it != active_groups.end(); ++it) {
     24     name_group_ids->push_back(MakeActiveGroupId(it->trial_name,
     25                                                 it->group_name));
     26   }
     27 }
     28 
     29 }  // namespace
     30 
     31 ActiveGroupId MakeActiveGroupId(const std::string& trial_name,
     32                                 const std::string& group_name) {
     33   ActiveGroupId id;
     34   id.name = metrics::HashName(trial_name);
     35   id.group = metrics::HashName(group_name);
     36   return id;
     37 }
     38 
     39 void GetFieldTrialActiveGroupIds(
     40     std::vector<ActiveGroupId>* name_group_ids) {
     41   DCHECK(name_group_ids->empty());
     42   // A note on thread safety: Since GetActiveFieldTrialGroups() is thread
     43   // safe, and we operate on a separate list of that data, this function is
     44   // technically thread safe as well, with respect to the FieldTrialList data.
     45   base::FieldTrial::ActiveGroups active_groups;
     46   base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
     47   GetFieldTrialActiveGroupIdsForActiveGroups(active_groups,
     48                                              name_group_ids);
     49 }
     50 
     51 void GetFieldTrialActiveGroupIdsAsStrings(std::vector<std::string>* output) {
     52   DCHECK(output->empty());
     53   std::vector<ActiveGroupId> name_group_ids;
     54   GetFieldTrialActiveGroupIds(&name_group_ids);
     55   for (size_t i = 0; i < name_group_ids.size(); ++i) {
     56     output->push_back(base::StringPrintf(
     57         "%x-%x", name_group_ids[i].name, name_group_ids[i].group));
     58   }
     59 }
     60 
     61 namespace testing {
     62 
     63 void TestGetFieldTrialActiveGroupIds(
     64     const base::FieldTrial::ActiveGroups& active_groups,
     65     std::vector<ActiveGroupId>* name_group_ids) {
     66   GetFieldTrialActiveGroupIdsForActiveGroups(active_groups,
     67                                              name_group_ids);
     68 }
     69 
     70 }  // namespace testing
     71 
     72 }  // namespace variations
     73