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// Copyright 2017 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/metrics/field_trials_provider.h"
#include "base/strings/string_piece.h"
#include "components/variations/active_field_trials.h"
#include "components/variations/synthetic_trial_registry.h"
#include "third_party/metrics_proto/system_profile.pb.h"
namespace variations {
namespace {
void WriteFieldTrials(const std::vector<ActiveGroupId>& field_trial_ids,
metrics::SystemProfileProto* system_profile) {
for (const ActiveGroupId& id : field_trial_ids) {
metrics::SystemProfileProto::FieldTrial* field_trial =
system_profile->add_field_trial();
field_trial->set_name_id(id.name);
field_trial->set_group_id(id.group);
}
}
} // namespace
FieldTrialsProvider::FieldTrialsProvider(SyntheticTrialRegistry* registry,
base::StringPiece suffix)
: registry_(registry), suffix_(suffix) {}
FieldTrialsProvider::~FieldTrialsProvider() = default;
void FieldTrialsProvider::GetFieldTrialIds(
std::vector<ActiveGroupId>* field_trial_ids) const {
// We use the default field trial suffixing (no suffix).
variations::GetFieldTrialActiveGroupIds(suffix_, field_trial_ids);
}
void FieldTrialsProvider::OnDidCreateMetricsLog() {
if (registry_) {
creation_times_.push_back(base::TimeTicks::Now());
}
}
void FieldTrialsProvider::ProvideSystemProfileMetrics(
metrics::SystemProfileProto* system_profile_proto) {
std::vector<ActiveGroupId> field_trial_ids;
GetFieldTrialIds(&field_trial_ids);
WriteFieldTrials(field_trial_ids, system_profile_proto);
if (registry_) {
base::TimeTicks creation_time;
// Should always be true, but don't crash even if there is a bug.
if (!creation_times_.empty()) {
creation_time = creation_times_.back();
creation_times_.pop_back();
}
std::vector<ActiveGroupId> synthetic_trials;
registry_->GetSyntheticFieldTrialsOlderThan(creation_time,
&synthetic_trials);
WriteFieldTrials(synthetic_trials, system_profile_proto);
}
}
} // namespace variations
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