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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (C) 2013-2014 Regents of the University of California.
* See COPYING for copyright and distribution information.
*/
#ifndef NDN_TRANSPORT_STREAM_TRANSPORT_HPP
#define NDN_TRANSPORT_STREAM_TRANSPORT_HPP
#include "../common.hpp"
namespace ndn {
const size_t MAX_LENGTH = 9000;
template<class BaseTransport, class Protocol>
class StreamTransportImpl
{
public:
typedef BaseTransport base_transport;
typedef Protocol protocol;
typedef StreamTransportImpl<BaseTransport,Protocol> impl;
StreamTransportImpl(base_transport& transport, boost::asio::io_service& ioService)
: m_transport(transport)
, m_socket(ioService)
, m_inputBufferSize(0)
, m_connectionInProgress(false)
, m_connectTimer(ioService)
{
}
void
connectHandler(const boost::system::error_code& error)
{
m_connectionInProgress = false;
m_connectTimer.cancel();
if (!error)
{
resume();
m_transport.m_isConnected = true;
for (std::list<Block>::iterator i = m_sendQueue.begin(); i != m_sendQueue.end(); ++i)
m_socket.async_send(boost::asio::buffer(i->wire(), i->size()),
bind(&impl::handle_async_send, this, _1, *i));
for (std::list< std::pair<Block,Block> >::iterator i = m_sendPairQueue.begin();
i != m_sendPairQueue.end(); ++i)
{
std::vector<boost::asio::const_buffer> buffer;
buffer.reserve(2);
buffer.push_back(boost::asio::buffer(i->first.wire(), i->first.size()));
buffer.push_back(boost::asio::buffer(i->second.wire(), i->second.size()));
m_socket.async_send(buffer,
bind(&impl::handle_async_send, this, _1, i->first, i->second));
}
m_sendQueue.clear();
m_sendPairQueue.clear();
}
else
{
// may need to throw exception
m_transport.m_isConnected = false;
m_transport.close();
throw Transport::Error(error, "error while connecting to the forwarder");
}
}
void
connectTimeoutHandler(const boost::system::error_code& error)
{
if (error) // e.g., cancelled timer
return;
m_connectionInProgress = false;
m_transport.m_isConnected = false;
m_transport.m_isExpectingData = false;
m_socket.close();
throw Transport::Error(error, "error while connecting to the forwarder");
}
void
connect(const typename protocol::endpoint& endpoint)
{
if (!m_connectionInProgress) {
m_connectionInProgress = true;
// Wait at most 4 time::seconds to connect
/// @todo Decide whether this number should be configurable
m_connectTimer.expires_from_now(boost::posix_time::seconds(4));
m_connectTimer.async_wait(bind(&impl::connectTimeoutHandler, this, _1));
m_socket.open();
m_socket.async_connect(endpoint,
bind(&impl::connectHandler, this, _1));
}
}
void
close()
{
m_connectTimer.cancel();
m_socket.close();
m_transport.m_isConnected = false;
m_transport.m_isExpectingData = false;
m_sendQueue.clear();
m_sendPairQueue.clear();
}
void
pause()
{
if (m_transport.m_isExpectingData)
{
m_transport.m_isExpectingData = false;
m_socket.cancel();
}
}
void
resume()
{
if (!m_transport.m_isExpectingData)
{
m_transport.m_isExpectingData = true;
m_inputBufferSize = 0;
m_socket.async_receive(boost::asio::buffer(m_inputBuffer, MAX_LENGTH), 0,
bind(&impl::handle_async_receive, this, _1, _2));
}
}
void
send(const Block& wire)
{
if (!m_transport.m_isConnected)
m_sendQueue.push_back(wire);
else
m_socket.async_send(boost::asio::buffer(wire.wire(), wire.size()),
bind(&impl::handle_async_send, this, _1, wire));
}
void
send(const Block& header, const Block& payload)
{
if (!m_transport.m_isConnected)
{
m_sendPairQueue.push_back(std::make_pair(header, payload));
}
else
{
std::vector<boost::asio::const_buffer> buffers;
buffers.reserve(2);
buffers.push_back(boost::asio::buffer(header.wire(), header.size()));
buffers.push_back(boost::asio::buffer(payload.wire(), payload.size()));
m_socket.async_send(buffers,
bind(&impl::handle_async_send, this, _1, header, payload));
}
}
inline bool
processAll(uint8_t* buffer, size_t& offset, size_t availableSize)
{
Block element;
while(offset < availableSize)
{
bool ok = Block::fromBuffer(buffer + offset, availableSize - offset, element);
if (!ok)
return false;
m_transport.receive(element);
offset += element.size();
}
return true;
}
void
handle_async_receive(const boost::system::error_code& error, std::size_t bytes_recvd)
{
if (error)
{
if (error == boost::system::errc::operation_canceled) {
// async receive has been explicitly cancelled (e.g., socket close)
return;
}
m_socket.close(); // closing at this point may not be that necessary
m_transport.m_isConnected = true;
throw Transport::Error(error, "error while receiving data from socket");
}
m_inputBufferSize += bytes_recvd;
// do magic
std::size_t offset = 0;
bool ok = processAll(m_inputBuffer, offset, m_inputBufferSize);
if (!ok && m_inputBufferSize == MAX_LENGTH && offset == 0)
{
// very bad... should close connection
m_socket.close();
m_transport.m_isConnected = false;
m_transport.m_isExpectingData = false;
throw Transport::Error(boost::system::error_code(),
"input buffer full, but a valid TLV cannot be decoded");
}
if (offset > 0)
{
if (offset != m_inputBufferSize)
{
std::copy(m_inputBuffer + offset, m_inputBuffer + m_inputBufferSize,
m_inputBuffer);
m_inputBufferSize -= offset;
}
else
{
m_inputBufferSize = 0;
}
}
m_socket.async_receive(boost::asio::buffer(m_inputBuffer + m_inputBufferSize,
MAX_LENGTH - m_inputBufferSize), 0,
bind(&impl::handle_async_receive, this, _1, _2));
}
void
handle_async_send(const boost::system::error_code& error, const Block& wire)
{
// pass (needed to keep data block alive during the send)
}
void
handle_async_send(const boost::system::error_code& error,
const Block& header, const Block& payload)
{
// pass (needed to keep data blocks alive during the send)
}
protected:
base_transport& m_transport;
typename protocol::socket m_socket;
uint8_t m_inputBuffer[MAX_LENGTH];
size_t m_inputBufferSize;
std::list< Block > m_sendQueue;
std::list< std::pair<Block, Block> > m_sendPairQueue;
bool m_connectionInProgress;
boost::asio::deadline_timer m_connectTimer;
};
template<class BaseTransport, class Protocol>
class StreamTransportWithResolverImpl : public StreamTransportImpl<BaseTransport, Protocol>
{
public:
typedef BaseTransport base_transport;
typedef Protocol protocol;
typedef StreamTransportWithResolverImpl<BaseTransport,Protocol> impl;
StreamTransportWithResolverImpl(base_transport& transport, boost::asio::io_service& ioService)
: StreamTransportImpl<base_transport, protocol>(transport, ioService)
{
}
void
resolveHandler(const boost::system::error_code& error,
typename protocol::resolver::iterator endpoint,
const shared_ptr<typename protocol::resolver>&)
{
if (error)
{
if (error == boost::system::errc::operation_canceled)
return;
throw Transport::Error(error, "Error during resolution of host or port");
}
typename protocol::resolver::iterator end;
if (endpoint == end)
{
this->m_connectionInProgress = false;
this->m_transport.m_isConnected = false;
this->m_transport.m_isExpectingData = false;
this->m_socket.close();
throw Transport::Error(error, "Unable to resolve because host or port");
}
this->m_socket.async_connect(*endpoint,
bind(&impl::connectHandler, this, _1));
}
void
connect(const typename protocol::resolver::query& query)
{
if (!this->m_connectionInProgress) {
this->m_connectionInProgress = true;
// Wait at most 4 time::seconds to connect
/// @todo Decide whether this number should be configurable
this->m_connectTimer.expires_from_now(boost::posix_time::seconds(4));
this->m_connectTimer.async_wait(bind(&impl::connectTimeoutHandler, this, _1));
// typename boost::asio::ip::basic_resolver< protocol > resolver;
shared_ptr<typename protocol::resolver> resolver =
make_shared<typename protocol::resolver>(boost::ref(this->m_socket.get_io_service()));
resolver->async_resolve(query, bind(&impl::resolveHandler, this, _1, _2, resolver));
}
}
};
} // namespace ndn
#endif // NDN_TRANSPORT_STREAM_TRANSPORT_HPP