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// Copyright 2014 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/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "remoting/protocol/fake_datagram_socket.h"
#include <utility>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/task/single_thread_task_runner.h"
#include "net/base/address_list.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace remoting::protocol {
FakeDatagramSocket::FakeDatagramSocket()
: input_pos_(0),
task_runner_(base::SingleThreadTaskRunner::GetCurrentDefault()) {}
FakeDatagramSocket::~FakeDatagramSocket() {
EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
}
void FakeDatagramSocket::AppendInputPacket(const std::string& data) {
EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
input_packets_.push_back(data);
// Complete pending read if any.
if (!read_callback_.is_null()) {
DCHECK_EQ(input_pos_, static_cast<int>(input_packets_.size()) - 1);
int result = CopyReadData(read_buffer_.get(), read_buffer_size_);
read_buffer_ = nullptr;
std::move(read_callback_).Run(result);
}
}
void FakeDatagramSocket::PairWith(FakeDatagramSocket* peer_socket) {
EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
peer_socket_ = peer_socket->GetWeakPtr();
peer_socket->peer_socket_ = GetWeakPtr();
}
base::WeakPtr<FakeDatagramSocket> FakeDatagramSocket::GetWeakPtr() {
return weak_factory_.GetWeakPtr();
}
int FakeDatagramSocket::Recv(const scoped_refptr<net::IOBuffer>& buf,
int buf_len,
const net::CompletionRepeatingCallback& callback) {
EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
if (input_pos_ < static_cast<int>(input_packets_.size())) {
return CopyReadData(buf, buf_len);
} else {
read_buffer_ = buf;
read_buffer_size_ = buf_len;
read_callback_ = callback;
return net::ERR_IO_PENDING;
}
}
int FakeDatagramSocket::Send(const scoped_refptr<net::IOBuffer>& buf,
int buf_len,
const net::CompletionRepeatingCallback& callback) {
EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
EXPECT_FALSE(send_pending_);
if (async_send_) {
send_pending_ = true;
task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&FakeDatagramSocket::DoAsyncSend,
weak_factory_.GetWeakPtr(), buf, buf_len, callback));
return net::ERR_IO_PENDING;
} else {
return DoSend(buf, buf_len);
}
}
void FakeDatagramSocket::DoAsyncSend(
const scoped_refptr<net::IOBuffer>& buf,
int buf_len,
const net::CompletionRepeatingCallback& callback) {
EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
EXPECT_TRUE(send_pending_);
send_pending_ = false;
callback.Run(DoSend(buf, buf_len));
}
int FakeDatagramSocket::DoSend(const scoped_refptr<net::IOBuffer>& buf,
int buf_len) {
EXPECT_TRUE(task_runner_->BelongsToCurrentThread());
if (next_send_error_ != net::OK) {
int r = next_send_error_;
next_send_error_ = net::OK;
return r;
}
written_packets_.push_back(std::string());
written_packets_.back().assign(buf->data(), buf->data() + buf_len);
if (peer_socket_.get()) {
task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&FakeDatagramSocket::AppendInputPacket, peer_socket_,
std::string(buf->data(), buf->data() + buf_len)));
}
return buf_len;
}
int FakeDatagramSocket::CopyReadData(const scoped_refptr<net::IOBuffer>& buf,
int buf_len) {
int size =
std::min(buf_len, static_cast<int>(input_packets_[input_pos_].size()));
memcpy(buf->data(), &(*input_packets_[input_pos_].begin()), size);
++input_pos_;
return size;
}
FakeDatagramChannelFactory::FakeDatagramChannelFactory()
: task_runner_(base::SingleThreadTaskRunner::GetCurrentDefault()),
asynchronous_create_(false),
fail_create_(false) {}
FakeDatagramChannelFactory::~FakeDatagramChannelFactory() {
for (auto it = channels_.begin(); it != channels_.end(); ++it) {
EXPECT_FALSE(it->second);
}
}
void FakeDatagramChannelFactory::PairWith(
FakeDatagramChannelFactory* peer_factory) {
peer_factory_ = peer_factory->weak_factory_.GetWeakPtr();
peer_factory_->peer_factory_ = weak_factory_.GetWeakPtr();
}
FakeDatagramSocket* FakeDatagramChannelFactory::GetFakeChannel(
const std::string& name) {
return channels_[name].get();
}
void FakeDatagramChannelFactory::CreateChannel(
const std::string& name,
ChannelCreatedCallback callback) {
EXPECT_FALSE(channels_[name]);
std::unique_ptr<FakeDatagramSocket> channel(new FakeDatagramSocket());
channels_[name] = channel->GetWeakPtr();
if (peer_factory_) {
FakeDatagramSocket* peer_socket = peer_factory_->GetFakeChannel(name);
if (peer_socket) {
channel->PairWith(peer_socket);
}
}
if (fail_create_) {
channel.reset();
}
if (asynchronous_create_) {
task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&FakeDatagramChannelFactory::NotifyChannelCreated,
weak_factory_.GetWeakPtr(), std::move(channel), name,
std::move(callback)));
} else {
NotifyChannelCreated(std::move(channel), name, std::move(callback));
}
}
void FakeDatagramChannelFactory::NotifyChannelCreated(
std::unique_ptr<FakeDatagramSocket> owned_socket,
const std::string& name,
ChannelCreatedCallback callback) {
if (base::Contains(channels_, name)) {
std::move(callback).Run(std::move(owned_socket));
}
}
void FakeDatagramChannelFactory::CancelChannelCreation(
const std::string& name) {
channels_.erase(name);
}
} // namespace remoting::protocol
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