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// Copyright 2023 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/optimization_guide/core/prediction_model_fetch_timer.h"
#include "base/rand_util.h"
#include "base/time/default_clock.h"
#include "components/optimization_guide/core/optimization_guide_features.h"
#include "components/optimization_guide/core/optimization_guide_prefs.h"
#include "components/prefs/pref_service.h"
namespace optimization_guide {
namespace {
// Provide a random time delta before fetching models.
base::TimeDelta RandomFetchDelay() {
return base::RandTimeDelta(features::PredictionModelFetchRandomMinDelay(),
features::PredictionModelFetchRandomMaxDelay());
}
} // namespace
PredictionModelFetchTimer::PredictionModelFetchTimer(
PrefService* pref_service,
base::RepeatingCallback<void(void)> fetch_callback)
: clock_(base::DefaultClock::GetInstance()),
pref_service_(pref_service),
fetch_callback_(fetch_callback) {}
PredictionModelFetchTimer::~PredictionModelFetchTimer() = default;
void PredictionModelFetchTimer::NotifyModelFetchAttempt() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
pref_service_->SetInt64(
prefs::kModelAndFeaturesLastFetchAttempt,
clock_->Now().ToDeltaSinceWindowsEpoch().InMicroseconds());
}
void PredictionModelFetchTimer::NotifyModelFetchSuccess() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
pref_service_->SetInt64(
prefs::kModelLastFetchSuccess,
clock_->Now().ToDeltaSinceWindowsEpoch().InMicroseconds());
}
base::Time PredictionModelFetchTimer::GetLastFetchAttemptTime() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return base::Time::FromDeltaSinceWindowsEpoch(base::Microseconds(
pref_service_->GetInt64(prefs::kModelAndFeaturesLastFetchAttempt)));
}
base::Time PredictionModelFetchTimer::GetLastFetchSuccessTime() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return base::Time::FromDeltaSinceWindowsEpoch(base::Microseconds(
pref_service_->GetInt64(prefs::kModelLastFetchSuccess)));
}
bool PredictionModelFetchTimer::IsFirstModelFetch() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return state_ == PredictionModelFetchTimerState::kFirstFetch;
}
void PredictionModelFetchTimer::OnFetchTimerFired() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_NE(PredictionModelFetchTimerState::kNone, state_);
fetch_callback_.Run();
}
void PredictionModelFetchTimer::MaybeScheduleFirstModelFetch() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (state_ != PredictionModelFetchTimerState::kNone) {
return;
}
// Add a slight delay to allow the rest of the browser startup process to
// finish up.
fetch_timer_.Start(FROM_HERE, features::PredictionModelFetchStartupDelay(),
this, &PredictionModelFetchTimer::OnFetchTimerFired);
state_ = PredictionModelFetchTimerState::kFirstFetch;
}
void PredictionModelFetchTimer::ScheduleFetchOnModelRegistration() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
switch (state_) {
case PredictionModelFetchTimerState::kNone:
// If no fetch is scheduled, maybe schedule one.
MaybeScheduleFirstModelFetch();
break;
case PredictionModelFetchTimerState::kPeriodicFetch:
state_ = PredictionModelFetchTimerState::kNewRegistrationFetch;
fetch_timer_.Start(
FROM_HERE, features::PredictionModelNewRegistrationFetchRandomDelay(),
this, &PredictionModelFetchTimer::OnFetchTimerFired);
break;
case PredictionModelFetchTimerState::kFirstFetch:
case PredictionModelFetchTimerState::kNewRegistrationFetch:
break;
}
}
void PredictionModelFetchTimer::SchedulePeriodicModelsFetch() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!fetch_timer_.IsRunning());
DCHECK_NE(PredictionModelFetchTimerState::kNone, state_);
const base::TimeDelta time_until_update_time =
GetLastFetchSuccessTime() + features::PredictionModelFetchInterval() -
clock_->Now();
const base::TimeDelta time_until_retry =
GetLastFetchAttemptTime() + features::PredictionModelFetchRetryDelay() -
clock_->Now();
base::TimeDelta fetcher_delay =
std::max(time_until_update_time, time_until_retry);
state_ = PredictionModelFetchTimerState::kPeriodicFetch;
if (fetcher_delay <= base::TimeDelta()) {
fetch_timer_.Start(FROM_HERE, RandomFetchDelay(), this,
&PredictionModelFetchTimer::OnFetchTimerFired);
return;
}
fetch_timer_.Start(FROM_HERE, fetcher_delay, this,
&PredictionModelFetchTimer::SchedulePeriodicModelsFetch);
}
void PredictionModelFetchTimer::Stop() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(fetch_timer_.IsRunning());
fetch_timer_.Stop();
}
PredictionModelFetchTimer::PredictionModelFetchTimerState
PredictionModelFetchTimer::GetStateForTesting() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return state_;
}
const base::OneShotTimer* PredictionModelFetchTimer::GetFetchTimerForTesting()
const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return &fetch_timer_;
}
void PredictionModelFetchTimer::SetClockForTesting(const base::Clock* clock) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
clock_ = clock;
}
void PredictionModelFetchTimer::ScheduleImmediateFetchForTesting() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
fetch_timer_.Stop();
fetch_timer_.Start(FROM_HERE, base::Milliseconds(1), this,
&PredictionModelFetchTimer::OnFetchTimerFired);
}
} // namespace optimization_guide
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