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// Copyright (c) 2011 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 "jingle/glue/channel_socket_adapter.h"
#include <limits>
#include "base/logging.h"
#include "base/message_loop.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "third_party/libjingle/source/talk/p2p/base/transportchannel.h"
namespace jingle_glue {
TransportChannelSocketAdapter::TransportChannelSocketAdapter(
cricket::TransportChannel* channel)
: message_loop_(MessageLoop::current()),
channel_(channel),
read_callback_(NULL),
write_callback_(NULL),
closed_error_code_(net::OK) {
DCHECK(channel_);
channel_->SignalReadPacket.connect(
this, &TransportChannelSocketAdapter::OnNewPacket);
channel_->SignalWritableState.connect(
this, &TransportChannelSocketAdapter::OnWritableState);
channel_->SignalDestroyed.connect(
this, &TransportChannelSocketAdapter::OnChannelDestroyed);
}
TransportChannelSocketAdapter::~TransportChannelSocketAdapter() {
}
int TransportChannelSocketAdapter::Read(
net::IOBuffer* buf, int buffer_size, net::OldCompletionCallback* callback) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
DCHECK(buf);
DCHECK(callback);
CHECK(!read_callback_);
if (!channel_) {
DCHECK(closed_error_code_ != net::OK);
return closed_error_code_;
}
read_callback_ = callback;
read_buffer_ = buf;
read_buffer_size_ = buffer_size;
return net::ERR_IO_PENDING;
}
int TransportChannelSocketAdapter::Write(
net::IOBuffer* buffer, int buffer_size, net::OldCompletionCallback* callback) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
DCHECK(buffer);
DCHECK(callback);
CHECK(!write_callback_);
if (!channel_) {
DCHECK(closed_error_code_ != net::OK);
return closed_error_code_;
}
int result;
if (channel_->writable()) {
result = channel_->SendPacket(buffer->data(), buffer_size);
if (result < 0) {
result = net::MapSystemError(channel_->GetError());
// If the underlying socket returns IO pending where it shouldn't we
// pretend the packet is dropped and return as succeeded because no
// writeable callback will happen.
if (result == net::ERR_IO_PENDING)
result = net::OK;
}
} else {
// Channel is not writable yet.
result = net::ERR_IO_PENDING;
write_callback_ = callback;
write_buffer_ = buffer;
write_buffer_size_ = buffer_size;
}
return result;
}
bool TransportChannelSocketAdapter::SetReceiveBufferSize(int32 size) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
return channel_->SetOption(talk_base::Socket::OPT_RCVBUF, size) == 0;
}
bool TransportChannelSocketAdapter::SetSendBufferSize(int32 size) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
return channel_->SetOption(talk_base::Socket::OPT_SNDBUF, size) == 0;
}
void TransportChannelSocketAdapter::Close(int error_code) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
if (!channel_) // Already closed.
return;
DCHECK(error_code != net::OK);
closed_error_code_ = error_code;
channel_->SignalReadPacket.disconnect(this);
channel_->SignalDestroyed.disconnect(this);
channel_ = NULL;
if (read_callback_) {
net::OldCompletionCallback* callback = read_callback_;
read_callback_ = NULL;
read_buffer_ = NULL;
callback->Run(error_code);
}
if (write_callback_) {
net::OldCompletionCallback* callback = write_callback_;
write_callback_ = NULL;
write_buffer_ = NULL;
callback->Run(error_code);
}
}
void TransportChannelSocketAdapter::OnNewPacket(
cricket::TransportChannel* channel, const char* data, size_t data_size) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
DCHECK_EQ(channel, channel_);
if (read_callback_) {
DCHECK(read_buffer_);
CHECK_LT(data_size, static_cast<size_t>(std::numeric_limits<int>::max()));
if (read_buffer_size_ < static_cast<int>(data_size)) {
LOG(WARNING) << "Data buffer is smaller than the received packet. "
<< "Dropping the data that doesn't fit.";
data_size = read_buffer_size_;
}
memcpy(read_buffer_->data(), data, data_size);
net::OldCompletionCallback* callback = read_callback_;
read_callback_ = NULL;
read_buffer_ = NULL;
callback->Run(data_size);
} else {
LOG(WARNING)
<< "Data was received without a callback. Dropping the packet.";
}
}
void TransportChannelSocketAdapter::OnWritableState(
cricket::TransportChannel* channel) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
// Try to send the packet if there is a pending write.
if (write_callback_) {
int result = channel_->SendPacket(write_buffer_->data(),
write_buffer_size_);
if (result < 0)
result = net::MapSystemError(channel_->GetError());
if (result != net::ERR_IO_PENDING) {
net::OldCompletionCallback* callback = write_callback_;
write_callback_ = NULL;
write_buffer_ = NULL;
callback->Run(result);
}
}
}
void TransportChannelSocketAdapter::OnChannelDestroyed(
cricket::TransportChannel* channel) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
DCHECK_EQ(channel, channel_);
Close(net::ERR_CONNECTION_ABORTED);
}
} // namespace jingle_glue
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