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/* -*- c++ -*- */
/*
* Copyright 2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "tcp_connection.h"
#include <gnuradio/basic_block.h>
#include <gnuradio/blocks/pdu.h>
namespace gr {
namespace blocks {
tcp_connection::sptr tcp_connection::make(boost::asio::io_service& io_service,
int MTU /*= 10000*/,
bool no_delay /*=false*/)
{
return sptr(new tcp_connection(io_service, MTU, no_delay));
}
tcp_connection::tcp_connection(boost::asio::io_service& io_service,
int MTU /*= 10000*/,
bool no_delay /*=false*/)
: d_socket(io_service), d_block(NULL), d_no_delay(no_delay)
{
d_buf.resize(MTU);
try {
d_socket.set_option(boost::asio::ip::tcp::no_delay(no_delay));
} catch (...) {
// Silently ignore failure (socket might be current in accept stage) and try again
// in 'start'
}
}
void tcp_connection::send(pmt::pmt_t vector)
{
size_t len = pmt::blob_length(vector);
// Asio async_write() requires the buffer to remain valid until the handler is called.
boost::shared_ptr<char[]> txbuf(new char[len]);
size_t temp = 0;
memcpy(txbuf.get(), pmt::uniform_vector_elements(vector, temp), len);
size_t offset = 0;
while (offset < len) {
// Limit the size of each write() to the MTU.
// FIXME: Note that this has the effect of breaking a large PDU into several
// smaller PDUs, each containing <= MTU bytes. Is this the desired behavior?
size_t send_len = std::min((len - offset), d_buf.size());
boost::asio::async_write(
d_socket,
boost::asio::buffer(txbuf.get() + offset, send_len),
boost::bind(&tcp_connection::handle_write,
this,
txbuf,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
offset += send_len;
}
}
void tcp_connection::start(gr::basic_block* block)
{
d_block = block;
d_socket.set_option(boost::asio::ip::tcp::no_delay(d_no_delay));
d_socket.async_read_some(boost::asio::buffer(d_buf),
boost::bind(&tcp_connection::handle_read,
this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}
void tcp_connection::handle_read(const boost::system::error_code& error,
size_t bytes_transferred)
{
if (!error) {
if (d_block) {
pmt::pmt_t vector =
pmt::init_u8vector(bytes_transferred, (const uint8_t*)&d_buf[0]);
pmt::pmt_t pdu = pmt::cons(pmt::PMT_NIL, vector);
d_block->message_port_pub(pdu::pdu_port_id(), pdu);
}
d_socket.async_read_some(
boost::asio::buffer(d_buf),
boost::bind(&tcp_connection::handle_read,
this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
} else {
d_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_both);
d_socket.close();
}
}
} /* namespace blocks */
} /* namespace gr */
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