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- // Copyright 2020 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.
- #include "chromecast/net/time_sync_tracker_fuchsia.h"
- #include <lib/zx/clock.h>
- #include <zircon/utc.h>
- #include "base/bind.h"
- #include "base/fuchsia/fuchsia_logging.h"
- #include "base/logging.h"
- #include "base/task/single_thread_task_runner.h"
- #include "base/time/time.h"
- namespace chromecast {
- namespace {
- // How often zx::clock is polled in seconds.
- const unsigned int kPollPeriodSeconds = 1;
- zx_handle_t GetUtcClockHandle() {
- zx_handle_t clock_handle = zx_utc_reference_get();
- DCHECK(clock_handle != ZX_HANDLE_INVALID);
- return clock_handle;
- }
- } // namespace
- TimeSyncTrackerFuchsia::TimeSyncTrackerFuchsia(
- scoped_refptr<base::SingleThreadTaskRunner> task_runner)
- : task_runner_(std::move(task_runner)),
- utc_clock_(GetUtcClockHandle()),
- weak_factory_(this) {
- DCHECK(task_runner_);
- weak_this_ = weak_factory_.GetWeakPtr();
- }
- TimeSyncTrackerFuchsia::~TimeSyncTrackerFuchsia() = default;
- void TimeSyncTrackerFuchsia::OnNetworkConnected() {
- if (!is_polling_ && !is_time_synced_) {
- is_polling_ = true;
- task_runner_->PostTask(
- FROM_HERE,
- base::BindOnce(&TimeSyncTrackerFuchsia::Poll, weak_this_));
- }
- }
- bool TimeSyncTrackerFuchsia::IsTimeSynced() const {
- return is_time_synced_;
- }
- void TimeSyncTrackerFuchsia::Poll() {
- DCHECK(task_runner_->BelongsToCurrentThread());
- DCHECK(is_polling_);
- zx_clock_details_v1_t details;
- zx_status_t status = utc_clock_->get_details(&details);
- ZX_CHECK(status == ZX_OK, status) << "zx_clock_get_details";
- is_time_synced_ =
- details.backstop_time != details.ticks_to_synthetic.synthetic_offset;
- DVLOG(2) << __func__ << ": backstop_time=" << details.backstop_time
- << ", synthetic_offset=" << details.ticks_to_synthetic.synthetic_offset
- << ", synced=" << is_time_synced_;
- if (!is_time_synced_) {
- task_runner_->PostDelayedTask(
- FROM_HERE, base::BindOnce(&TimeSyncTrackerFuchsia::Poll, weak_this_),
- base::Seconds(kPollPeriodSeconds));
- return;
- }
- is_polling_ = false;
- Notify();
- }
- } // namespace chromecast
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