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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.
// This file defines a service that collects information about the user
// experience in order to help improve future versions of the app.
#include <stdint.h>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram_flattener.h"
#include "base/metrics/histogram_snapshot_manager.h"
#include "base/metrics/user_metrics.h"
#include "base/sequence_checker.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "components/metrics/clean_exit_beacon.h"
#include "components/metrics/delegating_provider.h"
#include "components/metrics/metrics_log.h"
#include "components/metrics/metrics_log_manager.h"
#include "components/metrics/metrics_log_store.h"
#include "components/metrics/metrics_provider.h"
#include "components/metrics/metrics_reporting_service.h"
#include "components/variations/synthetic_trial_registry.h"
class PrefService;
class PrefRegistrySimple;
namespace base {
class HistogramSamples;
class PrefService;
namespace metrics {
class MetricsRotationScheduler;
class MetricsServiceClient;
class MetricsStateManager;
// See for a detailed description.
class MetricsService : public base::HistogramFlattener {
// Creates the MetricsService with the given |state_manager|, |client|, and
// |local_state|. Does not take ownership of the paramaters; instead stores
// a weak pointer to each. Caller should ensure that the parameters are valid
// for the lifetime of this class.
MetricsService(MetricsStateManager* state_manager,
MetricsServiceClient* client,
PrefService* local_state);
~MetricsService() override;
// Initializes metrics recording state. Updates various bookkeeping values in
// prefs and sets up the scheduler. This is a separate function rather than
// being done by the constructor so that field trials could be created before
// this is run.
void InitializeMetricsRecordingState();
// Starts the metrics system, turning on recording and uploading of metrics.
// Should be called when starting up with metrics enabled, or when metrics
// are turned on.
void Start();
// Starts the metrics system in a special test-only mode. Metrics won't ever
// be uploaded or persisted in this mode, but metrics will be recorded in
// memory.
void StartRecordingForTests();
// Starts updating the "last live" browser timestamp.
void StartUpdatingLastLiveTimestamp();
// Shuts down the metrics system. Should be called at shutdown, or if metrics
// are turned off.
void Stop();
// Enable/disable transmission of accumulated logs and crash reports (dumps).
// Calling Start() automatically enables reporting, but sending is
// asyncronous so this can be called immediately after Start() to prevent
// any uploading.
void EnableReporting();
void DisableReporting();
// Returns the client ID for this client, or the empty string if metrics
// recording is not currently running.
std::string GetClientId();
// Returns the install date of the application, in seconds since the epoch.
int64_t GetInstallDate();
// Returns the date at which the current metrics client ID was created as
// an int64_t containing seconds since the epoch.
int64_t GetMetricsReportingEnabledDate();
// Returns true if the last session exited cleanly.
bool WasLastShutdownClean() const;
// Registers local state prefs used by this class.
static void RegisterPrefs(PrefRegistrySimple* registry);
// HistogramFlattener:
void RecordDelta(const base::HistogramBase& histogram,
const base::HistogramSamples& snapshot) override;
// This should be called when the application is not idle, i.e. the user seems
// to be interacting with the application.
void OnApplicationNotIdle();
// Invoked when we get a WM_SESSIONEND. This places a value in prefs that is
// reset when RecordCompletedSessionEnd is invoked.
void RecordStartOfSessionEnd();
// This should be called when the application is shutting down. It records
// that session end was successful.
void RecordCompletedSessionEnd();
#if defined(OS_ANDROID) || defined(OS_IOS)
// Called when the application is going into background mode.
// If |keep_recording_in_background| is true, UMA is still recorded and
// reported while in the background.
void OnAppEnterBackground(bool keep_recording_in_background = false);
// Called when the application is coming out of background mode.
void OnAppEnterForeground(bool force_open_new_log = false);
// Set the dirty flag, which will require a later call to LogCleanShutdown().
void LogNeedForCleanShutdown();
#endif // defined(OS_ANDROID) || defined(OS_IOS)
// Saves in the preferences if the crash report registration was successful.
// This count is eventually send via UMA logs.
void RecordBreakpadRegistration(bool success);
// Saves in the preferences if the browser is running under a debugger.
// This count is eventually send via UMA logs.
void RecordBreakpadHasDebugger(bool has_debugger);
bool recording_active() const;
bool reporting_active() const;
bool has_unsent_logs() const;
// Redundant test to ensure that we are notified of a clean exit.
// This value should be true when process has completed shutdown.
static bool UmaMetricsProperlyShutdown();
// Register the specified |provider| to provide additional metrics into the
// UMA log. Should be called during MetricsService initialization only.
void RegisterMetricsProvider(std::unique_ptr<MetricsProvider> provider);
// Check if this install was cloned or imaged from another machine. If a
// clone is detected, reset the client id and low entropy source. This
// should not be called more than once.
void CheckForClonedInstall();
// Checks if the cloned install detector says that client ids should be reset.
bool ShouldResetClientIdsOnClonedInstall();
// Clears the stability metrics that are saved in local state.
void ClearSavedStabilityMetrics();
variations::SyntheticTrialRegistry* synthetic_trial_registry() {
return &synthetic_trial_registry_;
MetricsLogStore* LogStoreForTest() {
return reporting_service_.metrics_log_store();
// Test hook to safely stage the current log in the log store.
bool StageCurrentLogForTest();
// Sets the persistent system profile. Virtual for tests.
virtual void SetPersistentSystemProfile(const std::string& serialized_proto,
bool complete);
// Records the current environment (system profile) in |log|, and persists
// the results in prefs.
// Exposed for testing.
static std::string RecordCurrentEnvironmentHelper(
MetricsLog* log,
PrefService* local_state,
DelegatingProvider* delegating_provider);
// The MetricsService has a lifecycle that is stored as a state.
// See for description of this lifecycle.
enum State {
INITIALIZED, // Constructor was called.
INIT_TASK_SCHEDULED, // Waiting for deferred init tasks to finish.
INIT_TASK_DONE, // Waiting for timer to send initial log.
SENDING_LOGS, // Sending logs an creating new ones when we run out.
enum ShutdownCleanliness {
CLEANLY_SHUTDOWN = 0xdeadbeef,
// The current state of recording for the MetricsService. The state is UNSET
// until set to something else, at which point it remains INACTIVE or ACTIVE
// for the lifetime of the object.
enum RecordingState {
// Gets the LogStore for UMA logs.
MetricsLogStore* log_store() {
return reporting_service_.metrics_log_store();
// Calls into the client to initialize some system profile metrics.
void StartInitTask();
// Callback that moves the state to INIT_TASK_DONE. When this is called, the
// state should be INIT_TASK_SCHEDULED.
void FinishedInitTask();
void OnUserAction(const std::string& action, base::TimeTicks action_time);
// Get the amount of uptime since this process started and since the last
// call to this function. Also updates the cumulative uptime metric (stored
// as a pref) for uninstall. Uptimes are measured using TimeTicks, which
// guarantees that it is monotonic and does not jump if the user changes
// their clock. The TimeTicks implementation also makes the clock not
// count time the computer is suspended.
void GetUptimes(PrefService* pref,
base::TimeDelta* incremental_uptime,
base::TimeDelta* uptime);
// Turns recording on or off.
// DisableRecording() also forces a persistent save of logging state (if
// anything has been recorded, or transmitted).
void EnableRecording();
void DisableRecording();
// If in_idle is true, sets idle_since_last_transmission to true.
// If in_idle is false and idle_since_last_transmission_ is true, sets
// idle_since_last_transmission to false and starts the timer (provided
// starting the timer is permitted).
void HandleIdleSinceLastTransmission(bool in_idle);
// Set up client ID, session ID, etc.
void InitializeMetricsState();
// Opens a new log for recording user experience metrics.
void OpenNewLog();
// Closes out the current log after adding any last information.
void CloseCurrentLog();
// Pushes the text of the current and staged logs into persistent storage.
// Called when Chrome shuts down.
void PushPendingLogsToPersistentStorage();
// Ensures that scheduler is running, assuming the current settings are such
// that metrics should be reported. If not, this is a no-op.
void StartSchedulerIfNecessary();
// Starts the process of uploading metrics data.
void StartScheduledUpload();
// Called by the client via a callback when final log info collection is
// complete.
void OnFinalLogInfoCollectionDone();
// Prepares the initial stability log, which is only logged when the previous
// run of Chrome crashed. This log contains any stability metrics left over
// from that previous run, and only these stability metrics. It uses the
// system profile from the previous session. |prefs_previous_version| is used
// to validate the version number recovered from the system profile. Returns
// true if a log was created.
bool PrepareInitialStabilityLog(const std::string& prefs_previous_version);
// Prepares the initial metrics log, which includes startup histograms and
// profiler data, as well as incremental stability-related metrics.
void PrepareInitialMetricsLog();
// Reads, increments and then sets the specified long preference that is
// stored as a string.
void IncrementLongPrefsValue(const char* path);
// Records that the browser was shut down cleanly.
void LogCleanShutdown(bool end_completed);
// Creates a new MetricsLog instance with the given |log_type|.
std::unique_ptr<MetricsLog> CreateLog(MetricsLog::LogType log_type);
// Records the current environment (system profile) in |log|, and persists
// the results in prefs and GlobalPersistentSystemProfile.
void RecordCurrentEnvironment(MetricsLog* log, bool complete);
// Record complete list of histograms into the current log.
// Called when we close a log.
void RecordCurrentHistograms();
// Record complete list of stability histograms into the current log,
// i.e., histograms with the |kUmaStabilityHistogramFlag| flag set.
void RecordCurrentStabilityHistograms();
// Handle completion of PrepareProviderMetricsLog which is run as a
// background task.
void PrepareProviderMetricsLogDone(
std::unique_ptr<MetricsLog::IndependentMetricsLoader> loader,
bool success);
// Record a single independent profile and associated histogram from
// metrics providers. If this returns true, one was found and there may
// be more.
bool PrepareProviderMetricsLog();
// Records one independent histogram log and then reschedules itself to
// check for others. The interval is so as to not adversely impact the UI.
void PrepareProviderMetricsTask();
// Updates the "last live" browser timestamp and schedules the next update.
void UpdateLastLiveTimestampTask();
// Sub-service for uploading logs.
MetricsReportingService reporting_service_;
// Manager for the various in-flight logs.
MetricsLogManager log_manager_;
// |histogram_snapshot_manager_| prepares histogram deltas for transmission.
base::HistogramSnapshotManager histogram_snapshot_manager_;
// Used to manage various metrics reporting state prefs, such as client id,
// low entropy source and whether metrics reporting is enabled. Weak pointer.
MetricsStateManager* const state_manager_;
// Used to interact with the embedder. Weak pointer; must outlive |this|
// instance.
MetricsServiceClient* const client_;
// Registered metrics providers.
DelegatingProvider delegating_provider_;
PrefService* local_state_;
base::ActionCallback action_callback_;
// Indicate whether recording and reporting are currently happening.
// These should not be set directly, but by calling SetRecording and
// SetReporting.
RecordingState recording_state_;
// Indicate whether test mode is enabled, where the initial log should never
// be cut, and logs are neither persisted nor uploaded.
bool test_mode_active_;
// The progression of states made by the browser are recorded in the following
// state.
State state_;
// The initial metrics log, used to record startup metrics (histograms and
// profiler data). Note that if a crash occurred in the previous session, an
// initial stability log may be sent before this.
std::unique_ptr<MetricsLog> initial_metrics_log_;
// Whether the MetricsService object has received any notifications since
// the last time a transmission was sent.
bool idle_since_last_transmission_;
// A number that identifies the how many times the app has been launched.
int session_id_;
// The scheduler for determining when log rotations should happen.
std::unique_ptr<MetricsRotationScheduler> rotation_scheduler_;
// Stores the time of the first call to |GetUptimes()|.
base::TimeTicks first_updated_time_;
// Stores the time of the last call to |GetUptimes()|.
base::TimeTicks last_updated_time_;
variations::SyntheticTrialRegistry synthetic_trial_registry_;
// Indicates if loading of independent metrics is currently active.
bool independent_loader_active_ = false;
// Redundant marker to check that we completed our shutdown, and set the
// exited-cleanly bit in the prefs.
static ShutdownCleanliness clean_shutdown_status_;
FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, ActiveFieldTrialsReported);
FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, IsPluginProcess);
// Weak pointers factory used to post task on different threads. All weak
// pointers managed by this factory have the same lifetime as MetricsService.
base::WeakPtrFactory<MetricsService> self_ptr_factory_{this};
} // namespace metrics