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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/lazy_instance.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "components/variations/hashing.h"
#include "components/variations/synthetic_trials_active_group_id_provider.h"
namespace variations {
namespace {
base::LazyInstance<std::string>::Leaky g_seed_version;
// Populates |name_group_ids| based on |active_groups|. Field trial names are
// suffixed with |suffix| before hashing is executed.
void GetFieldTrialActiveGroupIdsForActiveGroups(
base::StringPiece suffix,
const base::FieldTrial::ActiveGroups& active_groups,
std::vector<ActiveGroupId>* name_group_ids) {
DCHECK(name_group_ids->empty());
for (auto it = active_groups.begin(); it != active_groups.end(); ++it) {
name_group_ids->push_back(
MakeActiveGroupId(it->trial_name + suffix.as_string(),
it->group_name + suffix.as_string()));
}
}
void AppendActiveGroupIdsAsStrings(
const std::vector<ActiveGroupId> name_group_ids,
std::vector<std::string>* output) {
for (const auto& active_group_id : name_group_ids) {
output->push_back(base::StringPrintf("%x-%x", active_group_id.name,
active_group_id.group));
}
}
} // namespace
ActiveGroupId MakeActiveGroupId(base::StringPiece trial_name,
base::StringPiece group_name) {
ActiveGroupId id;
id.name = HashName(trial_name);
id.group = HashName(group_name);
return id;
}
void GetFieldTrialActiveGroupIds(base::StringPiece suffix,
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(suffix, active_groups,
name_group_ids);
}
void GetFieldTrialActiveGroupIdsAsStrings(base::StringPiece suffix,
std::vector<std::string>* output) {
DCHECK(output->empty());
std::vector<ActiveGroupId> name_group_ids;
GetFieldTrialActiveGroupIds(suffix, &name_group_ids);
AppendActiveGroupIdsAsStrings(name_group_ids, output);
}
void GetSyntheticTrialGroupIdsAsString(std::vector<std::string>* output) {
std::vector<ActiveGroupId> name_group_ids;
SyntheticTrialsActiveGroupIdProvider::GetInstance()->GetActiveGroupIds(
&name_group_ids);
AppendActiveGroupIdsAsStrings(name_group_ids, output);
}
void SetSeedVersion(const std::string& seed_version) {
g_seed_version.Get() = seed_version;
}
const std::string& GetSeedVersion() {
return g_seed_version.Get();
}
namespace testing {
void TestGetFieldTrialActiveGroupIds(
base::StringPiece suffix,
const base::FieldTrial::ActiveGroups& active_groups,
std::vector<ActiveGroupId>* name_group_ids) {
GetFieldTrialActiveGroupIdsForActiveGroups(suffix, active_groups,
name_group_ids);
}
} // namespace testing
} // namespace variations
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