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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/kiosk/vision/internal/retry_timer.h"
#include <algorithm>
#include <bit>
#include <cstdint>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback_forward.h"
#include "base/location.h"
#include "base/syslog_logging.h"
#include "base/time/time.h"
namespace ash::kiosk_vision {
namespace {
// The delay to wait for before the very first retry.
constexpr auto kInitialDelay = base::Seconds(1);
// The maximum delay to wait for.
constexpr auto kMaxDelay = base::Minutes(5);
// The maximum value `run_count_` is allowed to increment to. Incrementing
// beyond this is not needed as `DelayFor(kMaxRunCount + 1)` crosses
// `kMaxDelay`.
constexpr int kMaxRunCount = std::bit_width((uint64_t)kMaxDelay.InSeconds());
base::TimeDelta DelayFor(int run_count) {
return std::min(kMaxDelay, kInitialDelay * (1 << run_count));
}
} // namespace
RetryTimer::RetryTimer() = default;
RetryTimer::~RetryTimer() = default;
void RetryTimer::Start(base::OnceClosure on_retry) {
auto delay = DelayFor(run_count_);
run_count_ = std::min(run_count_ + 1, kMaxRunCount);
SYSLOG(INFO) << "Kiosk Vision will retry after a delay of " << delay;
retry_timer_.Start(FROM_HERE, delay,
base::BindOnce(
[](base::OnceClosure on_retry) {
SYSLOG(INFO) << "Kiosk Vision retrying now...";
std::move(on_retry).Run();
},
std::move(on_retry)));
}
void RetryTimer::Stop() {
retry_timer_.Stop();
}
} // namespace ash::kiosk_vision
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