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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/variations/active_field_trials.h"
#include <stddef.h>
#include <vector>
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "components/variations/metrics_util.h"
namespace variations {
namespace {
// Populates |name_group_ids| based on |active_groups|.
void GetFieldTrialActiveGroupIdsForActiveGroups(
const base::FieldTrial::ActiveGroups& active_groups,
std::vector<ActiveGroupId>* name_group_ids) {
DCHECK(name_group_ids->empty());
for (base::FieldTrial::ActiveGroups::const_iterator it =
active_groups.begin(); it != active_groups.end(); ++it) {
name_group_ids->push_back(MakeActiveGroupId(it->trial_name,
it->group_name));
}
}
} // namespace
ActiveGroupId MakeActiveGroupId(const std::string& trial_name,
const std::string& group_name) {
ActiveGroupId id;
id.name = metrics::HashName(trial_name);
id.group = metrics::HashName(group_name);
return id;
}
void GetFieldTrialActiveGroupIds(
std::vector<ActiveGroupId>* name_group_ids) {
DCHECK(name_group_ids->empty());
// A note on thread safety: Since GetActiveFieldTrialGroups() is thread
// safe, and we operate on a separate list of that data, this function is
// technically thread safe as well, with respect to the FieldTrialList data.
base::FieldTrial::ActiveGroups active_groups;
base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
GetFieldTrialActiveGroupIdsForActiveGroups(active_groups,
name_group_ids);
}
void GetFieldTrialActiveGroupIdsAsStrings(std::vector<std::string>* output) {
DCHECK(output->empty());
std::vector<ActiveGroupId> name_group_ids;
GetFieldTrialActiveGroupIds(&name_group_ids);
for (size_t i = 0; i < name_group_ids.size(); ++i) {
output->push_back(base::StringPrintf(
"%x-%x", name_group_ids[i].name, name_group_ids[i].group));
}
}
namespace testing {
void TestGetFieldTrialActiveGroupIds(
const base::FieldTrial::ActiveGroups& active_groups,
std::vector<ActiveGroupId>* name_group_ids) {
GetFieldTrialActiveGroupIdsForActiveGroups(active_groups,
name_group_ids);
}
} // namespace testing
} // namespace variations
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