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// Copyright 2016 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/metrics/desktop_session_duration/desktop_session_duration_tracker.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.h"
#include "base/observer_list.h"
#include "base/strings/string_number_conversions.h"
namespace metrics {
namespace {
DesktopSessionDurationTracker* g_desktop_session_duration_tracker_instance =
nullptr;
} // namespace
// static
void DesktopSessionDurationTracker::Initialize() {
DCHECK(!g_desktop_session_duration_tracker_instance);
g_desktop_session_duration_tracker_instance =
new DesktopSessionDurationTracker;
}
// static
bool DesktopSessionDurationTracker::IsInitialized() {
return g_desktop_session_duration_tracker_instance != nullptr;
}
// static
DesktopSessionDurationTracker* DesktopSessionDurationTracker::Get() {
DCHECK(g_desktop_session_duration_tracker_instance);
return g_desktop_session_duration_tracker_instance;
}
void DesktopSessionDurationTracker::StartTimer(base::TimeDelta duration) {
timer_.Start(FROM_HERE, duration,
base::BindOnce(&DesktopSessionDurationTracker::OnTimerFired,
weak_factory_.GetWeakPtr()));
}
void DesktopSessionDurationTracker::OnVisibilityChanged(
bool visible,
base::TimeDelta time_ago) {
is_visible_ = visible;
if (is_visible_ && !is_first_session_) {
DCHECK(time_ago.is_zero());
OnUserEvent();
} else if (in_session_ && !is_audio_playing_) {
DCHECK(!visible);
DVLOG(4) << "Ending session due to visibility change";
EndSession(time_ago);
}
}
void DesktopSessionDurationTracker::AddObserver(Observer* observer) {
observer_list_.AddObserver(observer);
}
void DesktopSessionDurationTracker::RemoveObserver(Observer* observer) {
observer_list_.RemoveObserver(observer);
}
void DesktopSessionDurationTracker::OnUserEvent() {
if (!is_visible_)
return;
last_user_event_ = base::TimeTicks::Now();
// This may start session.
if (!in_session_) {
DVLOG(4) << "Starting session due to user event";
StartSession();
}
}
void DesktopSessionDurationTracker::EndSessionForTesting() {
if (!in_session_) {
StartSession();
}
EndSession(base::TimeDelta());
}
// static
void DesktopSessionDurationTracker::CleanupForTesting() {
DCHECK(g_desktop_session_duration_tracker_instance);
delete g_desktop_session_duration_tracker_instance;
g_desktop_session_duration_tracker_instance = nullptr;
}
void DesktopSessionDurationTracker::OnAudioStart() {
// This may start session.
is_audio_playing_ = true;
if (!in_session_) {
DVLOG(4) << "Starting session due to audio start";
StartSession();
}
}
void DesktopSessionDurationTracker::OnAudioEnd() {
is_audio_playing_ = false;
// If the timer is not running, this means that no user events happened in the
// last 5 minutes so the session can be terminated.
if (!timer_.IsRunning()) {
DVLOG(4) << "Ending session due to audio ending";
EndSession(base::TimeDelta());
}
}
DesktopSessionDurationTracker::DesktopSessionDurationTracker()
: session_start_(base::TimeTicks::Now()),
last_user_event_(session_start_),
audio_tracker_(this) {
InitInactivityTimeout();
}
DesktopSessionDurationTracker::~DesktopSessionDurationTracker() = default;
void DesktopSessionDurationTracker::OnTimerFired() {
base::TimeDelta remaining =
inactivity_timeout_ - (base::TimeTicks::Now() - last_user_event_);
if (remaining.ToInternalValue() > 0) {
StartTimer(remaining);
return;
}
// No user events happened in the last 5 min. Terminate the session now.
if (!is_audio_playing_) {
DVLOG(4) << "Ending session after delay";
EndSession(inactivity_timeout_);
}
}
void DesktopSessionDurationTracker::StartSession() {
DCHECK(!in_session_);
in_session_ = true;
is_first_session_ = false;
session_start_ = base::TimeTicks::Now();
StartTimer(inactivity_timeout_);
for (Observer& observer : observer_list_)
observer.OnSessionStarted(session_start_);
}
void DesktopSessionDurationTracker::EndSession(
base::TimeDelta time_to_discount) {
DCHECK(in_session_);
in_session_ = false;
// Cancel the inactivity timer, to prevent the session from ending a second
// time when it expires.
timer_.Stop();
base::TimeDelta delta = base::TimeTicks::Now() - session_start_;
// Trim any timeouts from the session length and lower bound to a session of
// length 0.
delta -= time_to_discount;
if (delta.is_negative())
delta = base::TimeDelta();
for (Observer& observer : observer_list_)
observer.OnSessionEnded(delta, session_start_ + delta);
DVLOG(4) << "Logging session length of " << delta.InSeconds() << " seconds.";
// Note: This metric is recorded separately for Android in
// UmaSessionStats::UmaEndSession.
UMA_HISTOGRAM_LONG_TIMES("Session.TotalDuration", delta);
UMA_HISTOGRAM_CUSTOM_TIMES("Session.TotalDurationMax1Day", delta,
base::Milliseconds(1), base::Hours(24), 50);
}
void DesktopSessionDurationTracker::InitInactivityTimeout() {
const int kDefaultInactivityTimeoutMinutes = 5;
int timeout_minutes = kDefaultInactivityTimeoutMinutes;
std::string param_value = base::GetFieldTrialParamValue(
"DesktopSessionDuration", "inactivity_timeout");
if (!param_value.empty())
base::StringToInt(param_value, &timeout_minutes);
inactivity_timeout_ = base::Minutes(timeout_minutes);
}
} // namespace metrics
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