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
13namespace variations {
14
15namespace {
16
17// Populates |name_group_ids| based on |active_groups|.
18void 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
31ActiveGroupId 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
39void 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
51void 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
61namespace testing {
62
63void 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