mirror of
https://github.com/klzgrad/naiveproxy.git
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135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/nqe/socket_watcher.h"
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#include "base/bind.h"
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#include "base/location.h"
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#include "base/single_thread_task_runner.h"
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#include "base/time/tick_clock.h"
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#include "base/time/time.h"
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#include "net/base/address_list.h"
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#include "net/base/ip_address.h"
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namespace net {
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namespace nqe {
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namespace internal {
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namespace {
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// Generate a compact representation for the first IP in |address_list|. For
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// IPv4, all 32 bits are used and for IPv6, the first 64 bits are used as the
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// remote host identifier.
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base::Optional<IPHash> CalculateIPHash(const AddressList& address_list) {
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if (address_list.empty())
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return base::nullopt;
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const IPAddress& ip_addr = address_list.front().address();
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IPAddressBytes bytes = ip_addr.bytes();
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// For IPv4, the first four bytes are taken. For IPv6, the first 8 bytes are
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// taken. For IPv4MappedIPv6, the last 4 bytes are taken.
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int index_min = ip_addr.IsIPv4MappedIPv6() ? 12 : 0;
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int index_max;
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if (ip_addr.IsIPv4MappedIPv6())
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index_max = 16;
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else
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index_max = ip_addr.IsIPv4() ? 4 : 8;
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DCHECK_LE(index_min, index_max);
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DCHECK_GE(8, index_max - index_min);
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uint64_t result = 0ULL;
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for (int i = index_min; i < index_max; ++i) {
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result = result << 8;
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result |= bytes[i];
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}
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return result;
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}
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} // namespace
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SocketWatcher::SocketWatcher(
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SocketPerformanceWatcherFactory::Protocol protocol,
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const AddressList& address_list,
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base::TimeDelta min_notification_interval,
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bool allow_rtt_private_address,
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scoped_refptr<base::SingleThreadTaskRunner> task_runner,
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OnUpdatedRTTAvailableCallback updated_rtt_observation_callback,
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ShouldNotifyRTTCallback should_notify_rtt_callback,
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const base::TickClock* tick_clock)
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: protocol_(protocol),
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task_runner_(std::move(task_runner)),
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updated_rtt_observation_callback_(updated_rtt_observation_callback),
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should_notify_rtt_callback_(should_notify_rtt_callback),
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rtt_notifications_minimum_interval_(min_notification_interval),
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run_rtt_callback_(allow_rtt_private_address ||
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(!address_list.empty() &&
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address_list.front().address().IsPubliclyRoutable())),
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tick_clock_(tick_clock),
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first_quic_rtt_notification_received_(false),
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host_(CalculateIPHash(address_list)) {
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DCHECK(tick_clock_);
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DCHECK(last_rtt_notification_.is_null());
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}
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SocketWatcher::~SocketWatcher() = default;
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bool SocketWatcher::ShouldNotifyUpdatedRTT() const {
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DCHECK(thread_checker_.CalledOnValidThread());
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if (!run_rtt_callback_)
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return false;
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const base::TimeTicks now = tick_clock_->NowTicks();
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if (task_runner_->RunsTasksInCurrentSequence()) {
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// Enables socket watcher to send more frequent RTT observations when very
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// few sockets are receiving data.
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if (should_notify_rtt_callback_.Run(now))
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return true;
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}
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// Do not allow incoming notifications if the last notification was more
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// recent than |rtt_notifications_minimum_interval_| ago. This helps in
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// reducing the overhead of obtaining the RTT values.
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// Enables a socket watcher to send RTT observation, helps in reducing
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// starvation by allowing every socket watcher to notify at least one RTT
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// notification every |rtt_notifications_minimum_interval_| duration.
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return now - last_rtt_notification_ >= rtt_notifications_minimum_interval_;
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}
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void SocketWatcher::OnUpdatedRTTAvailable(const base::TimeDelta& rtt) {
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DCHECK(thread_checker_.CalledOnValidThread());
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if (rtt <= base::TimeDelta())
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return;
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if (!first_quic_rtt_notification_received_ &&
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protocol_ == SocketPerformanceWatcherFactory::PROTOCOL_QUIC) {
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// First RTT sample from QUIC connections may be synthetically generated,
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// and may not reflect the actual network quality.
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first_quic_rtt_notification_received_ = true;
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return;
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}
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last_rtt_notification_ = tick_clock_->NowTicks();
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task_runner_->PostTask(
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FROM_HERE,
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base::Bind(updated_rtt_observation_callback_, protocol_, rtt, host_));
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}
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void SocketWatcher::OnConnectionChanged() {
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DCHECK(thread_checker_.CalledOnValidThread());
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}
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} // namespace internal
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} // namespace nqe
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} // namespace net
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