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// Copyright 2015 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 "remoting/protocol/webrtc_data_stream_adapter.h"
#include <stdint.h>
#include "base/bind.h"
#include "base/callback.h"
#include "base/callback_helpers.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/thread_task_runner_handle.h"
#include "net/base/net_errors.h"
#include "remoting/base/compound_buffer.h"
#include "remoting/protocol/message_pipe.h"
#include "remoting/protocol/message_serialization.h"
namespace remoting {
namespace protocol {
class WebrtcDataStreamAdapter::Channel : public MessagePipe,
public webrtc::DataChannelObserver {
public:
explicit Channel(base::WeakPtr<WebrtcDataStreamAdapter> adapter);
~Channel() override;
void Start(rtc::scoped_refptr<webrtc::DataChannelInterface> channel);
std::string name() { return channel_->label(); }
// MessagePipe interface.
void StartReceiving(const MessageReceivedCallback& callback) override;
void Send(google::protobuf::MessageLite* message,
const base::Closure& done) override;
private:
enum class State { CONNECTING, OPEN, CLOSED };
// webrtc::DataChannelObserver interface.
void OnStateChange() override;
void OnMessage(const webrtc::DataBuffer& buffer) override;
void OnConnected();
void OnError();
base::WeakPtr<WebrtcDataStreamAdapter> adapter_;
rtc::scoped_refptr<webrtc::DataChannelInterface> channel_;
MessageReceivedCallback message_received_callback_;
State state_ = State::CONNECTING;
DISALLOW_COPY_AND_ASSIGN(Channel);
};
WebrtcDataStreamAdapter::Channel::Channel(
base::WeakPtr<WebrtcDataStreamAdapter> adapter)
: adapter_(adapter) {}
WebrtcDataStreamAdapter::Channel::~Channel() {
if (channel_) {
channel_->UnregisterObserver();
channel_->Close();
}
}
void WebrtcDataStreamAdapter::Channel::Start(
rtc::scoped_refptr<webrtc::DataChannelInterface> channel) {
DCHECK(!channel_);
channel_ = channel;
channel_->RegisterObserver(this);
if (channel_->state() == webrtc::DataChannelInterface::kOpen) {
OnConnected();
} else {
DCHECK_EQ(channel_->state(), webrtc::DataChannelInterface::kConnecting);
}
}
void WebrtcDataStreamAdapter::Channel::StartReceiving(
const MessageReceivedCallback& callback) {
DCHECK(message_received_callback_.is_null());
DCHECK(!callback.is_null());
message_received_callback_ = callback;
}
void WebrtcDataStreamAdapter::Channel::Send(
google::protobuf::MessageLite* message,
const base::Closure& done) {
rtc::CopyOnWriteBuffer buffer;
buffer.SetSize(message->ByteSize());
message->SerializeWithCachedSizesToArray(
reinterpret_cast<uint8_t*>(buffer.data()));
webrtc::DataBuffer data_buffer(std::move(buffer), true /* binary */);
if (!channel_->Send(data_buffer)) {
OnError();
return;
}
if (!done.is_null())
done.Run();
}
void WebrtcDataStreamAdapter::Channel::OnStateChange() {
switch (channel_->state()) {
case webrtc::DataChannelInterface::kOpen:
OnConnected();
break;
case webrtc::DataChannelInterface::kClosing:
// Currently channels are not expected to be closed.
OnError();
break;
case webrtc::DataChannelInterface::kConnecting:
case webrtc::DataChannelInterface::kClosed:
break;
}
}
void WebrtcDataStreamAdapter::Channel::OnConnected() {
CHECK(state_ == State::CONNECTING);
state_ = State::OPEN;
adapter_->OnChannelConnected(this);
}
void WebrtcDataStreamAdapter::Channel::OnError() {
if (state_ == State::CLOSED)
return;
state_ = State::CLOSED;
// Notify the adapter about the error asychronously.
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::Bind(&WebrtcDataStreamAdapter::OnChannelError, adapter_));
}
void WebrtcDataStreamAdapter::Channel::OnMessage(
const webrtc::DataBuffer& rtc_buffer) {
scoped_ptr<CompoundBuffer> buffer(new CompoundBuffer());
buffer->AppendCopyOf(reinterpret_cast<const char*>(rtc_buffer.data.data()),
rtc_buffer.data.size());
buffer->Lock();
message_received_callback_.Run(std::move(buffer));
}
struct WebrtcDataStreamAdapter::PendingChannel {
PendingChannel() {}
PendingChannel(scoped_ptr<Channel> channel,
const ChannelCreatedCallback& connected_callback)
: channel(std::move(channel)), connected_callback(connected_callback) {}
PendingChannel(PendingChannel&& other)
: channel(std::move(other.channel)),
connected_callback(std::move(other.connected_callback)) {}
PendingChannel& operator=(PendingChannel&& other) {
channel = std::move(other.channel);
connected_callback = std::move(other.connected_callback);
return *this;
}
scoped_ptr<Channel> channel;
ChannelCreatedCallback connected_callback;
};
WebrtcDataStreamAdapter::WebrtcDataStreamAdapter(
bool outgoing,
const ErrorCallback& error_callback)
: outgoing_(outgoing),
error_callback_(error_callback),
weak_factory_(this) {}
WebrtcDataStreamAdapter::~WebrtcDataStreamAdapter() {
DCHECK(pending_channels_.empty());
}
void WebrtcDataStreamAdapter::Initialize(
rtc::scoped_refptr<webrtc::PeerConnectionInterface> peer_connection) {
peer_connection_ = peer_connection;
}
void WebrtcDataStreamAdapter::OnIncomingDataChannel(
webrtc::DataChannelInterface* data_channel) {
DCHECK(!outgoing_);
auto it = pending_channels_.find(data_channel->label());
if (it == pending_channels_.end()) {
LOG(ERROR) << "Received unexpected data channel " << data_channel->label();
return;
}
it->second.channel->Start(data_channel);
}
void WebrtcDataStreamAdapter::CreateChannel(
const std::string& name,
const ChannelCreatedCallback& callback) {
DCHECK(peer_connection_);
DCHECK(pending_channels_.find(name) == pending_channels_.end());
Channel* channel = new Channel(weak_factory_.GetWeakPtr());
pending_channels_[name] = PendingChannel(make_scoped_ptr(channel), callback);
if (outgoing_) {
webrtc::DataChannelInit config;
config.reliable = true;
channel->Start(peer_connection_->CreateDataChannel(name, &config));
}
}
void WebrtcDataStreamAdapter::CancelChannelCreation(const std::string& name) {
auto it = pending_channels_.find(name);
DCHECK(it != pending_channels_.end());
pending_channels_.erase(it);
}
void WebrtcDataStreamAdapter::OnChannelConnected(Channel* channel) {
auto it = pending_channels_.find(channel->name());
DCHECK(it != pending_channels_.end());
PendingChannel pending_channel = std::move(it->second);
pending_channels_.erase(it);
// Once the channel is connected its ownership is passed to the
// |connected_callback|.
pending_channel.connected_callback.Run(std::move(pending_channel.channel));
}
void WebrtcDataStreamAdapter::OnChannelError() {
error_callback_.Run(CHANNEL_CONNECTION_ERROR);
}
} // namespace protocol
} // namespace remoting
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