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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_METRICS_POWER_POWER_METRICS_REPORTER_H_
#define CHROME_BROWSER_METRICS_POWER_POWER_METRICS_REPORTER_H_
#include <memory>
#include <optional>
#include <utility>
#include "base/power_monitor/battery_level_provider.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "build/build_config.h"
#include "chrome/browser/metrics/power/power_metrics.h"
#include "chrome/browser/metrics/power/process_monitor.h"
#include "chrome/browser/metrics/usage_scenario/usage_scenario.h"
#include "chrome/browser/metrics/usage_scenario/usage_scenario_data_store.h"
#include "chrome/browser/metrics/usage_scenario/usage_scenario_tracker.h"
#include "components/performance_manager/public/power/battery_level_provider_creator.h"
// Reports metrics related to power (battery discharge, cpu time, etc.).
//
// Metrics are reported for 2 minutes intervals, with suffixes describing what
// the user did during the interval. These intervals are long enough to capture
// most side-effects of what the user did (e.g. a navigation increases memory
// usage which may cause a major GC after some time).
//
// A few metrics are also reported for 10 seconds intervals. They are meant to
// be used as triggers to upload traces from the field. Traces from the field
// only cover a few seconds and it is only possible to correctly analyze a trace
// if it covers the full interval associated with the trigger metric.
//
// This class should be created shortly after ProcessMonitor.
//
// Previous histograms reported by this class:
// - Main screen brightness, removed by https://crrev.com/c/3431905
// Historical data: go/chrome-historical-power-histograms
class PowerMetricsReporter : public ProcessMonitor::Observer {
public:
// Use the default arguments in production. In tests, use arguments to provide
// mocks. |long_usage_scenario_data_store| are queried to determine the
// scenario for long reporting intervals. They must outlive the
// PowerMetricsReporter. |battery_level_provider| is used to obtain the
// battery level.
explicit PowerMetricsReporter(
ProcessMonitor* process_monitor,
UsageScenarioDataStore* long_usage_scenario_data_store = nullptr,
std::unique_ptr<base::BatteryLevelProvider> battery_level_provider =
performance_manager::power::CreateBatteryLevelProvider()
);
PowerMetricsReporter(const PowerMetricsReporter& rhs) = delete;
PowerMetricsReporter& operator=(const PowerMetricsReporter& rhs) = delete;
~PowerMetricsReporter() override;
std::optional<base::BatteryLevelProvider::BatteryState>&
battery_state_for_testing() {
return battery_state_;
}
static int64_t GetBucketForSampleForTesting(base::TimeDelta value);
private:
// Called when the initial battery state is obtained.
void OnFirstBatteryStateSampled(
const std::optional<base::BatteryLevelProvider::BatteryState>&
battery_state);
// Starts the timer for the long interval.
void StartNextLongInterval();
// Called when the long interval ended.
void OnLongIntervalEnd();
// ProcessMonitor::Observer:
void OnMetricsSampled(MonitoredProcessType type,
const ProcessMonitor::Metrics& metrics) override;
void OnAggregatedMetricsSampled(
const ProcessMonitor::Metrics& aggregated_process_metrics) override;
void OnBatteryAndAggregatedProcessMetricsSampled(
const ProcessMonitor::Metrics& aggregated_process_metrics,
base::TimeDelta interval_duration,
const std::optional<base::BatteryLevelProvider::BatteryState>&
new_battery_state);
// Called when the long interval ends.
void ReportMetrics(
const UsageScenarioDataStore::IntervalData& long_interval_data,
base::TimeDelta interval_duration,
const ProcessMonitor::Metrics& aggregated_process_metrics);
// Called after `ReportMetrics` on platforms where a `BatteryLevelProvider` is
// available to record metrics specific to the battery state.
void ReportBatterySpecificMetrics(
const UsageScenarioDataStore::IntervalData& long_interval_data,
base::TimeDelta interval_duration,
const ProcessMonitor::Metrics& aggregated_process_metrics,
BatteryDischarge battery_discharge);
// Report the UKMs for the past interval.
static void ReportBatteryUKMs(
const UsageScenarioDataStore::IntervalData& interval_data,
const ProcessMonitor::Metrics& aggregated_process_metrics,
base::TimeDelta interval_duration,
BatteryDischarge battery_discharge);
raw_ptr<ProcessMonitor> process_monitor_;
// Track usage scenarios over 2-minutes intervals. In production, the data
// stores are obtained from the trackers, but in tests they may be mocks
// injected via the constructor.
std::unique_ptr<UsageScenarioTracker> long_usage_scenario_tracker_;
raw_ptr<UsageScenarioDataStore> long_usage_scenario_data_store_;
std::unique_ptr<base::BatteryLevelProvider> battery_level_provider_;
std::optional<base::BatteryLevelProvider::BatteryState> battery_state_;
base::TimeTicks interval_begin_;
base::OneShotTimer interval_timer_;
SEQUENCE_CHECKER(sequence_checker_);
};
#endif // CHROME_BROWSER_METRICS_POWER_POWER_METRICS_REPORTER_H_
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