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//
// Copyright 2010 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/transport/udp_simple.hpp>
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/format.hpp>
#include <iostream>
using namespace uhd::transport;
/***********************************************************************
* Helper Functions
**********************************************************************/
/*!
* A receive timeout for a socket:
*
* It seems that asio cannot have timeouts with synchronous io.
* However, we can implement a polling loop that will timeout.
* This is okay bacause this is the slow-path implementation.
*
* \param socket the asio socket
*/
static void reasonable_recv_timeout(
boost::asio::ip::udp::socket &socket
){
boost::asio::deadline_timer timer(socket.get_io_service());
timer.expires_from_now(boost::posix_time::milliseconds(100));
while (not (socket.available() or timer.expires_from_now().is_negative())){
boost::this_thread::sleep(boost::posix_time::milliseconds(1));
}
}
/***********************************************************************
* UDP connected implementation class
**********************************************************************/
class udp_connected_impl : public udp_simple{
public:
//structors
udp_connected_impl(const std::string &addr, const std::string &port);
~udp_connected_impl(void);
//send/recv
size_t send(const boost::asio::const_buffer &buff);
size_t recv(const boost::asio::mutable_buffer &buff);
private:
boost::asio::ip::udp::socket *_socket;
boost::asio::io_service _io_service;
};
udp_connected_impl::udp_connected_impl(const std::string &addr, const std::string &port){
//std::cout << boost::format("Creating udp transport for %s %s") % addr % port << std::endl;
// resolve the address
boost::asio::ip::udp::resolver resolver(_io_service);
boost::asio::ip::udp::resolver::query query(boost::asio::ip::udp::v4(), addr, port);
boost::asio::ip::udp::endpoint receiver_endpoint = *resolver.resolve(query);
// Create, open, and connect the socket
_socket = new boost::asio::ip::udp::socket(_io_service);
_socket->open(boost::asio::ip::udp::v4());
_socket->connect(receiver_endpoint);
}
udp_connected_impl::~udp_connected_impl(void){
delete _socket;
}
size_t udp_connected_impl::send(const boost::asio::const_buffer &buff){
return _socket->send(boost::asio::buffer(buff));
}
size_t udp_connected_impl::recv(const boost::asio::mutable_buffer &buff){
reasonable_recv_timeout(*_socket);
if (not _socket->available()) return 0;
return _socket->receive(boost::asio::buffer(buff));
}
/***********************************************************************
* UDP broadcast implementation class
**********************************************************************/
class udp_broadcast_impl : public udp_simple{
public:
//structors
udp_broadcast_impl(const std::string &addr, const std::string &port);
~udp_broadcast_impl(void);
//send/recv
size_t send(const boost::asio::const_buffer &buff);
size_t recv(const boost::asio::mutable_buffer &buff);
private:
boost::asio::ip::udp::socket *_socket;
boost::asio::ip::udp::endpoint _receiver_endpoint;
boost::asio::io_service _io_service;
};
udp_broadcast_impl::udp_broadcast_impl(const std::string &addr, const std::string &port){
//std::cout << boost::format("Creating udp transport for %s %s") % addr % port << std::endl;
// resolve the address
boost::asio::ip::udp::resolver resolver(_io_service);
boost::asio::ip::udp::resolver::query query(boost::asio::ip::udp::v4(), addr, port);
_receiver_endpoint = *resolver.resolve(query);
// Create and open the socket
_socket = new boost::asio::ip::udp::socket(_io_service);
_socket->open(boost::asio::ip::udp::v4());
// Allow broadcasting
boost::asio::socket_base::broadcast option(true);
_socket->set_option(option);
}
udp_broadcast_impl::~udp_broadcast_impl(void){
delete _socket;
}
size_t udp_broadcast_impl::send(const boost::asio::const_buffer &buff){
return _socket->send_to(boost::asio::buffer(buff), _receiver_endpoint);
}
size_t udp_broadcast_impl::recv(const boost::asio::mutable_buffer &buff){
reasonable_recv_timeout(*_socket);
if (not _socket->available()) return 0;
boost::asio::ip::udp::endpoint sender_endpoint;
return _socket->receive_from(boost::asio::buffer(buff), sender_endpoint);
}
/***********************************************************************
* UDP public make functions
**********************************************************************/
udp_simple::sptr udp_simple::make_connected(
const std::string &addr, const std::string &port
){
return sptr(new udp_connected_impl(addr, port));
}
udp_simple::sptr udp_simple::make_broadcast(
const std::string &addr, const std::string &port
){
return sptr(new udp_broadcast_impl(addr, port));
}
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