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// Copyright 2017 The Chromium Authors
// 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 <string>
#include <string_view>
#include <vector>
#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,
std::string_view suffix)
: registry_(registry), suffix_(suffix) {}
FieldTrialsProvider::~FieldTrialsProvider() = default;
void FieldTrialsProvider::GetFieldTrialIds(
std::vector<ActiveGroupId>* field_trial_ids) const {
// As the trial groups are included in metrics reports, we must not include
// the low anonymity trials.
variations::GetFieldTrialActiveGroupIds(suffix_, field_trial_ids);
}
void FieldTrialsProvider::ProvideSystemProfileMetrics(
metrics::SystemProfileProto* system_profile_proto) {
// ProvideSystemProfileMetricsWithLogCreationTime() should be called instead.
NOTREACHED();
}
void FieldTrialsProvider::ProvideSystemProfileMetricsWithLogCreationTime(
base::TimeTicks log_creation_time,
metrics::SystemProfileProto* system_profile_proto) {
// TODO(crbug.com/40697205): Maybe call ProvideCurrentSessionData() instead
// from places in which ProvideSystemProfileMetricsWithLogCreationTime() is
// called, e.g. startup_data.cc and background_tracing_metrics_provider.cc.
log_creation_time_ = log_creation_time;
const std::string& version = variations::GetSeedVersion();
if (!version.empty())
system_profile_proto->set_variations_seed_version(version);
// TODO(crbug.com/40133600): Determine whether this can be deleted.
GetAndWriteFieldTrials(system_profile_proto);
}
void FieldTrialsProvider::ProvideCurrentSessionData(
metrics::ChromeUserMetricsExtension* uma_proto) {
// This function is called from both
// ProvideSystemProfileMetricsWithLogCreationTime() and
// ProvideCurrentSessionData() so that field trials activated in other metrics
// providers are captured. We need both calls because in some scenarios in
// which this class is used, only the former function gets called.
DCHECK(!log_creation_time_.is_null());
GetAndWriteFieldTrials(uma_proto->mutable_system_profile());
}
void FieldTrialsProvider::SetLogCreationTimeForTesting(base::TimeTicks time) {
log_creation_time_ = time;
}
void FieldTrialsProvider::GetAndWriteFieldTrials(
metrics::SystemProfileProto* system_profile_proto) const {
system_profile_proto->clear_field_trial();
std::vector<ActiveGroupId> field_trials;
GetFieldTrialIds(&field_trials);
WriteFieldTrials(field_trials, system_profile_proto);
// May be null in tests.
if (registry_) {
std::vector<ActiveGroupId> synthetic_trials;
registry_->GetSyntheticFieldTrialsOlderThan(log_creation_time_,
&synthetic_trials, suffix_);
WriteFieldTrials(synthetic_trials, system_profile_proto);
}
}
} // namespace variations
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