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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "third_party/blink/renderer/platform/p2p/socket_client_impl.h"
#include "base/location.h"
#include "base/metrics/histogram_macros.h"
#include "base/time/time.h"
#include "base/trace_event/common/trace_event_common.h"
#include "crypto/random.h"
#include "services/network/public/cpp/p2p_param_traits.h"
#include "third_party/blink/renderer/platform/p2p/socket_client_delegate.h"
#include "third_party/blink/renderer/platform/p2p/socket_dispatcher.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace {
uint64_t GetUniqueId(uint32_t random_socket_id, uint32_t packet_id) {
uint64_t uid = random_socket_id;
uid <<= 32;
uid |= packet_id;
return uid;
}
void RecordNumberOfPacketsInBatch(int num_packets) {
DCHECK_GT(num_packets, 0);
UMA_HISTOGRAM_COUNTS("WebRTC.P2P.UDP.BatchingNumberOfSentPackets",
num_packets);
}
} // namespace
namespace blink {
P2PSocketClientImpl::P2PSocketClientImpl(bool batch_packets)
: batch_packets_(batch_packets),
socket_id_(0),
delegate_(nullptr),
state_(kStateUninitialized),
random_socket_id_(0),
next_packet_id_(0) {
crypto::RandBytes(base::byte_span_from_ref(random_socket_id_));
}
P2PSocketClientImpl::~P2PSocketClientImpl() {
CHECK(state_ == kStateClosed || state_ == kStateUninitialized);
}
void P2PSocketClientImpl::Init(blink::P2PSocketClientDelegate* delegate) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(delegate);
// |delegate_| is only accessesed on |delegate_message_loop_|.
delegate_ = delegate;
DCHECK_EQ(state_, kStateUninitialized);
state_ = kStateOpening;
receiver_.set_disconnect_handler(WTF::BindOnce(
&P2PSocketClientImpl::OnConnectionError, WTF::Unretained(this)));
}
uint64_t P2PSocketClientImpl::Send(
const net::IPEndPoint& address,
base::span<const uint8_t> data,
const webrtc::AsyncSocketPacketOptions& options) {
uint64_t unique_id = GetUniqueId(random_socket_id_, ++next_packet_id_);
// Can send data only when the socket is open.
DCHECK(state_ == kStateOpen || state_ == kStateError);
if (state_ == kStateOpen) {
SendWithPacketId(address, data, options, unique_id);
}
return unique_id;
}
void P2PSocketClientImpl::FlushBatch() {
DoSendBatch();
}
void P2PSocketClientImpl::DoSendBatch() {
TRACE_EVENT1("p2p", __func__, "num_packets", batched_send_packets_.size());
awaiting_batch_complete_ = false;
if (!batched_send_packets_.empty()) {
WTF::Vector<network::mojom::blink::P2PSendPacketPtr> batched_send_packets;
batched_send_packets_.swap(batched_send_packets);
RecordNumberOfPacketsInBatch(batched_send_packets.size());
socket_->SendBatch(std::move(batched_send_packets));
batched_packets_storage_.clear();
}
}
void P2PSocketClientImpl::SendWithPacketId(
const net::IPEndPoint& address,
base::span<const uint8_t> data,
const webrtc::AsyncSocketPacketOptions& options,
uint64_t packet_id) {
TRACE_EVENT_NESTABLE_ASYNC_BEGIN0("p2p", "Send", packet_id);
// Conditionally start or continue temporarily storing the packets of a batch.
// We can't allow sending individual packets mid batch since we would receive
// SendComplete with out-of-order packet IDs. Therefore, we include them in
// the batch.
// Additionally, logic below ensures we send single-packet batches to use the
// Send interface instead of SendBatch to reduce pointless overhead.
if (batch_packets_ &&
(awaiting_batch_complete_ ||
(options.batchable && !options.last_packet_in_batch))) {
awaiting_batch_complete_ = true;
batched_packets_storage_.emplace_back(data);
const auto& storage = batched_packets_storage_.back();
batched_send_packets_.emplace_back(
network::mojom::blink::P2PSendPacket::New(
base::span<const uint8_t>(storage.begin(), storage.end()),
network::P2PPacketInfo(address, options, packet_id)));
if (options.last_packet_in_batch) {
DoSendBatch();
}
} else {
RecordNumberOfPacketsInBatch(1);
awaiting_batch_complete_ = false;
socket_->Send(data, network::P2PPacketInfo(address, options, packet_id));
}
}
void P2PSocketClientImpl::SetOption(network::P2PSocketOption option,
int value) {
DCHECK(state_ == kStateOpen || state_ == kStateError);
if (state_ == kStateOpen)
socket_->SetOption(option, value);
}
void P2PSocketClientImpl::Close() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
delegate_ = nullptr;
if (socket_)
socket_.reset();
state_ = kStateClosed;
}
int P2PSocketClientImpl::GetSocketID() const {
return socket_id_;
}
void P2PSocketClientImpl::SetDelegate(
blink::P2PSocketClientDelegate* delegate) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
delegate_ = delegate;
}
void P2PSocketClientImpl::SocketCreated(const net::IPEndPoint& local_address,
const net::IPEndPoint& remote_address) {
state_ = kStateOpen;
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (delegate_)
delegate_->OnOpen(local_address, remote_address);
}
void P2PSocketClientImpl::SendComplete(
const network::P2PSendPacketMetrics& send_metrics) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (delegate_)
delegate_->OnSendComplete(send_metrics);
}
void P2PSocketClientImpl::SendBatchComplete(
const WTF::Vector<::network::P2PSendPacketMetrics>& in_send_metrics_batch) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
TRACE_EVENT1("p2p", __func__, "num_packets", in_send_metrics_batch.size());
if (delegate_) {
for (const auto& send_metrics : in_send_metrics_batch) {
delegate_->OnSendComplete(send_metrics);
}
}
}
void P2PSocketClientImpl::DataReceived(
WTF::Vector<P2PReceivedPacketPtr> packets) {
DCHECK(!packets.empty());
DCHECK_EQ(kStateOpen, state_);
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (delegate_) {
for (auto& packet : packets) {
delegate_->OnDataReceived(packet->socket_address, packet->data,
packet->timestamp, packet->ecn);
}
}
}
void P2PSocketClientImpl::OnConnectionError() {
state_ = kStateError;
if (delegate_)
delegate_->OnError();
}
} // namespace blink
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