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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/glic/host/glic_synthetic_trial_manager.h"
#include <algorithm>
#include <cstddef>
#include <ranges>
#include <string_view>
#include <utility>
#include <vector>
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/metrics/histogram_functions.h"
#include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
#include "components/metrics/metrics_service.h"
#include "components/variations/synthetic_trial_registry.h"
namespace glic {
GlicSyntheticTrialManager::GlicSyntheticTrialManager(
metrics_services_manager::MetricsServicesManager* metrics_services_manager)
: metrics_services_manager_(metrics_services_manager) {}
GlicSyntheticTrialManager::~GlicSyntheticTrialManager() {
if (metrics_service_) {
metrics_service_->RemoveLogsObserver(this);
}
}
void GlicSyntheticTrialManager::SetSyntheticExperimentState(
const std::string& trial_name,
const std::string& group_name) {
if (!metrics_service_) {
metrics_service_ = metrics_services_manager_->GetMetricsService();
DCHECK(metrics_service_);
metrics_service_->AddLogsObserver(this);
}
// If already registered discard the logs if in a different group. This
// avoids combining logs from multiple groups from different profiles.
bool conflicting_group_registered =
synthetic_field_trial_groups_.count(trial_name) > 0 &&
synthetic_field_trial_groups_[trial_name] != group_name;
if (conflicting_group_registered) {
if (synthetic_field_trial_groups_[trial_name] != "MultiProfileDetected") {
base::UmaHistogramBoolean(
"Glic.ChromeClient.MultiProfileSyntheticTrialConflictDetected",
conflicting_group_registered);
}
ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial(
trial_name, "MultiProfileDetected",
variations::SyntheticTrialAnnotationMode::kCurrentLog);
synthetic_field_trial_groups_[trial_name] = "MultiProfileDetected";
// After contaminated logfile is uploaded we store the the most recently
// requested group to register the next created log file. If TrialA.Group1
// is reported then TrialA.Group2, then TrialA.Group3, then the next log cut
// will register TrialA.Group3.
staged_synthetic_field_trial_groups_[trial_name] = group_name;
} else {
ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial(
trial_name, group_name,
variations::SyntheticTrialAnnotationMode::kCurrentLog);
synthetic_field_trial_groups_[trial_name] = group_name;
}
}
void GlicSyntheticTrialManager::OnLogEvent(
metrics::MetricsLogsEventManager::LogEvent event,
std::string_view log_hash,
std::string_view message) {
if (event == metrics::MetricsLogsEventManager::LogEvent::kLogCreated &&
!staged_synthetic_field_trial_groups_.empty()) {
// Remove all elements from synthetic_field_trial_groups_ that have
// entries in staged_synthetic_field_trial_groups_ with the same
// trial_name.
for (const auto& [trial, group] : staged_synthetic_field_trial_groups_) {
ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial(
trial, group, variations::SyntheticTrialAnnotationMode::kCurrentLog);
synthetic_field_trial_groups_[trial] = group;
}
staged_synthetic_field_trial_groups_ = {};
}
}
} // namespace glic
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