blob: 1781185b1163ba870d46827a18ed6414ca75dde9 [file] [log] [blame]
// Copyright 2014 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.
// MSVC++ requires this to be set before any other includes to get M_PI.
#define _USE_MATH_DEFINES
#include "remoting/test/fake_socket_factory.h"
#include <math.h>
#include <stddef.h>
#include "base/bind.h"
#include "base/callback.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/rand_util.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "base/time/time.h"
#include "net/base/io_buffer.h"
#include "remoting/test/leaky_bucket.h"
#include "third_party/webrtc/base/asyncpacketsocket.h"
#include "third_party/webrtc/media/base/rtputils.h"
namespace remoting {
namespace {
const int kPortRangeStart = 1024;
const int kPortRangeEnd = 65535;
double GetNormalRandom(double average, double stddev) {
// Based on Box-Muller transform, see
// http://en.wikipedia.org/wiki/Box_Muller_transform .
return average +
stddev * sqrt(-2.0 * log(1.0 - base::RandDouble())) *
cos(base::RandDouble() * 2.0 * M_PI);
}
class FakeUdpSocket : public rtc::AsyncPacketSocket {
public:
FakeUdpSocket(FakePacketSocketFactory* factory,
scoped_refptr<FakeNetworkDispatcher> dispatcher,
const rtc::SocketAddress& local_address);
~FakeUdpSocket() override;
void ReceivePacket(const rtc::SocketAddress& from,
const rtc::SocketAddress& to,
const scoped_refptr<net::IOBuffer>& data,
int data_size);
// rtc::AsyncPacketSocket interface.
rtc::SocketAddress GetLocalAddress() const override;
rtc::SocketAddress GetRemoteAddress() const override;
int Send(const void* data,
size_t data_size,
const rtc::PacketOptions& options) override;
int SendTo(const void* data,
size_t data_size,
const rtc::SocketAddress& address,
const rtc::PacketOptions& options) override;
int Close() override;
State GetState() const override;
int GetOption(rtc::Socket::Option option, int* value) override;
int SetOption(rtc::Socket::Option option, int value) override;
int GetError() const override;
void SetError(int error) override;
private:
FakePacketSocketFactory* factory_;
scoped_refptr<FakeNetworkDispatcher> dispatcher_;
rtc::SocketAddress local_address_;
State state_;
DISALLOW_COPY_AND_ASSIGN(FakeUdpSocket);
};
FakeUdpSocket::FakeUdpSocket(FakePacketSocketFactory* factory,
scoped_refptr<FakeNetworkDispatcher> dispatcher,
const rtc::SocketAddress& local_address)
: factory_(factory),
dispatcher_(dispatcher),
local_address_(local_address),
state_(STATE_BOUND) {
}
FakeUdpSocket::~FakeUdpSocket() {
factory_->OnSocketDestroyed(local_address_.port());
}
void FakeUdpSocket::ReceivePacket(const rtc::SocketAddress& from,
const rtc::SocketAddress& to,
const scoped_refptr<net::IOBuffer>& data,
int data_size) {
SignalReadPacket(
this, data->data(), data_size, from, rtc::CreatePacketTime(0));
}
rtc::SocketAddress FakeUdpSocket::GetLocalAddress() const {
return local_address_;
}
rtc::SocketAddress FakeUdpSocket::GetRemoteAddress() const {
NOTREACHED();
return rtc::SocketAddress();
}
int FakeUdpSocket::Send(const void* data, size_t data_size,
const rtc::PacketOptions& options) {
NOTREACHED();
return EINVAL;
}
int FakeUdpSocket::SendTo(const void* data, size_t data_size,
const rtc::SocketAddress& address,
const rtc::PacketOptions& options) {
scoped_refptr<net::IOBuffer> buffer = new net::IOBuffer(data_size);
memcpy(buffer->data(), data, data_size);
cricket::ApplyPacketOptions(
reinterpret_cast<uint8_t*>(buffer->data()), data_size,
options.packet_time_params,
(base::TimeTicks::Now() - base::TimeTicks()).InMilliseconds());
dispatcher_->DeliverPacket(local_address_, address, buffer, data_size);
return data_size;
}
int FakeUdpSocket::Close() {
state_ = STATE_CLOSED;
return 0;
}
rtc::AsyncPacketSocket::State FakeUdpSocket::GetState() const {
return state_;
}
int FakeUdpSocket::GetOption(rtc::Socket::Option option, int* value) {
NOTIMPLEMENTED();
return -1;
}
int FakeUdpSocket::SetOption(rtc::Socket::Option option, int value) {
NOTIMPLEMENTED();
return -1;
}
int FakeUdpSocket::GetError() const {
return 0;
}
void FakeUdpSocket::SetError(int error) {
NOTREACHED();
}
} // namespace
FakePacketSocketFactory::PendingPacket::PendingPacket()
: data_size(0) {
}
FakePacketSocketFactory::PendingPacket::PendingPacket(
const rtc::SocketAddress& from,
const rtc::SocketAddress& to,
const scoped_refptr<net::IOBuffer>& data,
int data_size)
: from(from), to(to), data(data), data_size(data_size) {
}
FakePacketSocketFactory::PendingPacket::PendingPacket(
const PendingPacket& other) = default;
FakePacketSocketFactory::PendingPacket::~PendingPacket() {
}
FakePacketSocketFactory::FakePacketSocketFactory(
FakeNetworkDispatcher* dispatcher)
: task_runner_(base::ThreadTaskRunnerHandle::Get()),
dispatcher_(dispatcher),
address_(dispatcher_->AllocateAddress()),
out_of_order_rate_(0.0),
next_port_(kPortRangeStart),
weak_factory_(this) {
dispatcher_->AddNode(this);
}
FakePacketSocketFactory::~FakePacketSocketFactory() {
CHECK(udp_sockets_.empty());
dispatcher_->RemoveNode(this);
}
void FakePacketSocketFactory::OnSocketDestroyed(int port) {
DCHECK(task_runner_->BelongsToCurrentThread());
udp_sockets_.erase(port);
}
void FakePacketSocketFactory::SetBandwidth(int bandwidth, int max_buffer) {
DCHECK(task_runner_->BelongsToCurrentThread());
if (bandwidth <= 0) {
leaky_bucket_.reset();
} else {
leaky_bucket_.reset(new LeakyBucket(max_buffer, bandwidth));
}
}
void FakePacketSocketFactory::SetLatency(base::TimeDelta average,
base::TimeDelta stddev) {
DCHECK(task_runner_->BelongsToCurrentThread());
latency_average_ = average;
latency_stddev_ = stddev;
}
rtc::AsyncPacketSocket* FakePacketSocketFactory::CreateUdpSocket(
const rtc::SocketAddress& local_address,
uint16_t min_port,
uint16_t max_port) {
DCHECK(task_runner_->BelongsToCurrentThread());
int port = -1;
if (min_port > 0 && max_port > 0) {
for (uint16_t i = min_port; i <= max_port; ++i) {
if (udp_sockets_.find(i) == udp_sockets_.end()) {
port = i;
break;
}
}
if (port < 0)
return nullptr;
} else {
do {
port = next_port_;
next_port_ =
(next_port_ >= kPortRangeEnd) ? kPortRangeStart : (next_port_ + 1);
} while (udp_sockets_.find(port) != udp_sockets_.end());
}
CHECK(local_address.ipaddr() == address_);
FakeUdpSocket* result =
new FakeUdpSocket(this, dispatcher_,
rtc::SocketAddress(local_address.ipaddr(), port));
udp_sockets_[port] =
base::Bind(&FakeUdpSocket::ReceivePacket, base::Unretained(result));
return result;
}
rtc::AsyncPacketSocket* FakePacketSocketFactory::CreateServerTcpSocket(
const rtc::SocketAddress& local_address,
uint16_t min_port,
uint16_t max_port,
int opts) {
return nullptr;
}
rtc::AsyncPacketSocket* FakePacketSocketFactory::CreateClientTcpSocket(
const rtc::SocketAddress& local_address,
const rtc::SocketAddress& remote_address,
const rtc::ProxyInfo& proxy_info,
const std::string& user_agent,
int opts) {
return nullptr;
}
rtc::AsyncResolverInterface*
FakePacketSocketFactory::CreateAsyncResolver() {
return nullptr;
}
const scoped_refptr<base::SingleThreadTaskRunner>&
FakePacketSocketFactory::GetThread() const {
return task_runner_;
}
const rtc::IPAddress& FakePacketSocketFactory::GetAddress() const {
return address_;
}
void FakePacketSocketFactory::ReceivePacket(
const rtc::SocketAddress& from,
const rtc::SocketAddress& to,
const scoped_refptr<net::IOBuffer>& data,
int data_size) {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(to.ipaddr() == address_);
base::TimeDelta delay;
if (leaky_bucket_) {
delay = leaky_bucket_->AddPacket(data_size);
if (delay.is_max()) {
// Drop the packet.
return;
}
}
if (latency_average_ > base::TimeDelta()) {
delay += base::TimeDelta::FromMillisecondsD(
GetNormalRandom(latency_average_.InMillisecondsF(),
latency_stddev_.InMillisecondsF()));
}
if (delay < base::TimeDelta())
delay = base::TimeDelta();
// Put the packet to the |pending_packets_| and post a task for
// DoReceivePackets(). Note that the DoReceivePackets() task posted here may
// deliver a different packet, not the one added to the queue here. This
// would happen if another task gets posted with a shorted delay or when
// |out_of_order_rate_| is greater than 0. It's implemented this way to
// decouple latency variability from out-of-order delivery.
PendingPacket packet(from, to, data, data_size);
pending_packets_.push_back(packet);
task_runner_->PostDelayedTask(
FROM_HERE,
base::Bind(&FakePacketSocketFactory::DoReceivePacket,
weak_factory_.GetWeakPtr()),
delay);
}
void FakePacketSocketFactory::DoReceivePacket() {
DCHECK(task_runner_->BelongsToCurrentThread());
PendingPacket packet;
if (pending_packets_.size() > 1 && base::RandDouble() < out_of_order_rate_) {
std::list<PendingPacket>::iterator it = pending_packets_.begin();
++it;
packet = *it;
pending_packets_.erase(it);
} else {
packet = pending_packets_.front();
pending_packets_.pop_front();
}
UdpSocketsMap::iterator iter = udp_sockets_.find(packet.to.port());
if (iter == udp_sockets_.end()) {
// Invalid port number.
return;
}
iter->second.Run(packet.from, packet.to, packet.data, packet.data_size);
}
} // namespace remoting