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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/quic_channel.h"
#include "base/callback_helpers.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace remoting {
namespace protocol {
static const size_t kNamePrefixLength = 1;
static const size_t kMaxNameLength = 255;
QuicChannel::QuicChannel(net::QuicP2PStream* stream,
const base::Closure& on_destroyed_callback)
: stream_(stream), on_destroyed_callback_(on_destroyed_callback) {
DCHECK(stream_);
stream_->SetDelegate(this);
}
QuicChannel::~QuicChannel() {
// Don't call the read callback when destroying the stream.
read_callback_.Reset();
on_destroyed_callback_.Run();
// The callback must destroy the stream which must result in OnClose().
DCHECK(!stream_);
}
int QuicChannel::Read(const scoped_refptr<net::IOBuffer>& buffer,
int buffer_len,
const net::CompletionCallback& callback) {
DCHECK(read_callback_.is_null());
if (error_ != net::OK)
return error_;
if (data_received_.total_bytes() == 0) {
read_buffer_ = buffer;
read_buffer_size_ = buffer_len;
read_callback_ = callback;
return net::ERR_IO_PENDING;
}
int result = std::min(buffer_len, data_received_.total_bytes());
data_received_.CopyTo(buffer->data(), result);
data_received_.CropFront(result);
return result;
}
int QuicChannel::Write(const scoped_refptr<net::IOBuffer>& buffer,
int buffer_len,
const net::CompletionCallback& callback) {
if (error_ != net::OK)
return error_;
return stream_->Write(base::StringPiece(buffer->data(), buffer_len),
callback);
}
void QuicChannel::SetName(const std::string& name) {
DCHECK(name_.empty());
name_ = name;
}
void QuicChannel::OnDataReceived(const char* data, int length) {
if (read_callback_.is_null()) {
data_received_.AppendCopyOf(data, length);
return;
}
DCHECK_EQ(data_received_.total_bytes(), 0);
int bytes_to_read = std::min(length, read_buffer_size_);
memcpy(read_buffer_->data(), data, bytes_to_read);
read_buffer_ = nullptr;
// Copy leftover data to |data_received_|.
if (length > bytes_to_read)
data_received_.AppendCopyOf(data + bytes_to_read, length - bytes_to_read);
base::ResetAndReturn(&read_callback_).Run(bytes_to_read);
}
void QuicChannel::OnClose(net::QuicErrorCode error) {
error_ = (error == net::QUIC_NO_ERROR) ? net::ERR_CONNECTION_CLOSED
: net::ERR_QUIC_PROTOCOL_ERROR;
stream_ = nullptr;
if (!read_callback_.is_null()) {
base::ResetAndReturn(&read_callback_).Run(error_);
}
}
QuicClientChannel::QuicClientChannel(net::QuicP2PStream* stream,
const base::Closure& on_destroyed_callback,
const std::string& name)
: QuicChannel(stream, on_destroyed_callback) {
CHECK_LE(name.size(), kMaxNameLength);
SetName(name);
// Send the name to the host.
stream_->WriteHeader(
std::string(kNamePrefixLength, static_cast<char>(name.size())) + name);
}
QuicClientChannel::~QuicClientChannel() {}
QuicServerChannel::QuicServerChannel(
net::QuicP2PStream* stream,
const base::Closure& on_destroyed_callback)
: QuicChannel(stream, on_destroyed_callback) {}
void QuicServerChannel::ReceiveName(
const base::Closure& name_received_callback) {
name_received_callback_ = name_received_callback;
// First read 1 byte containing name length.
name_read_buffer_ = new net::DrainableIOBuffer(
new net::IOBuffer(kNamePrefixLength), kNamePrefixLength);
int result = Read(name_read_buffer_, kNamePrefixLength,
base::Bind(&QuicServerChannel::OnNameSizeReadResult,
base::Unretained(this)));
if (result != net::ERR_IO_PENDING)
OnNameSizeReadResult(result);
}
QuicServerChannel::~QuicServerChannel() {}
void QuicServerChannel::OnNameSizeReadResult(int result) {
if (result < 0) {
base::ResetAndReturn(&name_received_callback_).Run();
return;
}
DCHECK_EQ(result, static_cast<int>(kNamePrefixLength));
name_length_ = *reinterpret_cast<uint8_t*>(name_read_buffer_->data());
name_read_buffer_ =
new net::DrainableIOBuffer(new net::IOBuffer(name_length_), name_length_);
ReadNameLoop(0);
}
void QuicServerChannel::ReadNameLoop(int result) {
while (result >= 0 && name_read_buffer_->BytesRemaining() > 0) {
result = Read(name_read_buffer_, name_read_buffer_->BytesRemaining(),
base::Bind(&QuicServerChannel::OnNameReadResult,
base::Unretained(this)));
if (result >= 0) {
name_read_buffer_->DidConsume(result);
}
}
if (result < 0 && result != net::ERR_IO_PENDING) {
// Failed to read name for the stream.
base::ResetAndReturn(&name_received_callback_).Run();
return;
}
if (name_read_buffer_->BytesRemaining() == 0) {
name_read_buffer_->SetOffset(0);
SetName(std::string(name_read_buffer_->data(),
name_read_buffer_->data() + name_length_));
base::ResetAndReturn(&name_received_callback_).Run();
}
}
void QuicServerChannel::OnNameReadResult(int result) {
if (result > 0)
name_read_buffer_->DidConsume(result);
ReadNameLoop(result);
}
} // namespace protocol
} // namespace remoting
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