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/* -*- c++ -*- */
/*
* Copyright 2007-2010,2013 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 "udp_source_impl.h"
#include <gnuradio/io_signature.h>
#include <gnuradio/math.h>
#include <gnuradio/prefs.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <memory>
#include <stdexcept>
namespace gr {
namespace blocks {
const int udp_source_impl::BUF_SIZE_PAYLOADS =
gr::prefs::singleton()->get_long("udp_blocks", "buf_size_payloads", 50);
udp_source::sptr udp_source::make(
size_t itemsize, const std::string& ipaddr, int port, int payload_size, bool eof)
{
return gnuradio::make_block_sptr<udp_source_impl>(
itemsize, ipaddr, port, payload_size, eof);
}
udp_source_impl::udp_source_impl(
size_t itemsize, const std::string& host, int port, int payload_size, bool eof)
: sync_block(
"udp_source", io_signature::make(0, 0, 0), io_signature::make(1, 1, itemsize)),
d_itemsize(itemsize),
d_payload_size(payload_size),
d_eof(eof),
d_connected(false),
d_rxbuf(4 * payload_size),
d_residbuf(BUF_SIZE_PAYLOADS * payload_size),
d_residual(0),
d_sent(0)
{
connect(host, port);
}
udp_source_impl::~udp_source_impl()
{
if (d_connected)
disconnect();
}
void udp_source_impl::connect(const std::string& host, int port)
{
if (d_connected)
disconnect();
d_host = host;
d_port = static_cast<unsigned short>(port);
std::string s_port;
s_port = (boost::format("%d") % d_port).str();
if (!host.empty()) {
boost::asio::ip::udp::resolver resolver(d_io_service);
boost::asio::ip::udp::resolver::query query(
d_host, s_port, boost::asio::ip::resolver_query_base::passive);
d_endpoint = *resolver.resolve(query);
d_socket = std::make_unique<boost::asio::ip::udp::socket>(d_io_service);
d_socket->open(d_endpoint.protocol());
boost::asio::socket_base::reuse_address roption(true);
d_socket->set_option(roption);
d_socket->bind(d_endpoint);
start_receive();
d_udp_thread =
gr::thread::thread(boost::bind(&udp_source_impl::run_io_service, this));
d_connected = true;
}
}
void udp_source_impl::disconnect()
{
gr::thread::scoped_lock lock(d_setlock);
if (!d_connected)
return;
d_io_service.reset();
d_io_service.stop();
d_udp_thread.join();
d_socket->close();
d_socket.reset();
d_connected = false;
}
// Return port number of d_socket
int udp_source_impl::get_port(void)
{
// return d_endpoint.port();
return d_socket->local_endpoint().port();
}
void udp_source_impl::start_receive()
{
d_socket->async_receive_from(
boost::asio::buffer((void*)d_rxbuf.data(), d_payload_size),
d_endpoint_rcvd,
boost::bind(&udp_source_impl::handle_read,
this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}
void udp_source_impl::handle_read(const boost::system::error_code& error,
size_t bytes_transferred)
{
if (!error) {
{
boost::lock_guard<gr::thread::mutex> lock(d_udp_mutex);
if (d_eof && (bytes_transferred == 0)) {
// If we are using EOF notification, test for it and don't
// add anything to the output.
d_residual = WORK_DONE;
d_cond_wait.notify_one();
return;
} else {
// Make sure we never go beyond the boundary of the
// residual buffer. This will just drop the last bit of
// data in the buffer if we've run out of room.
if ((int)(d_residual + bytes_transferred) >=
(BUF_SIZE_PAYLOADS * d_payload_size)) {
GR_LOG_WARN(d_logger, "Too much data; dropping packet.");
} else {
// otherwise, copy received data into local buffer for
// copying later.
memcpy(d_residbuf.data() + d_residual,
d_rxbuf.data(),
bytes_transferred);
d_residual += bytes_transferred;
}
}
d_cond_wait.notify_one();
}
}
start_receive();
}
int udp_source_impl::work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
gr::thread::scoped_lock l(d_setlock);
char* out = (char*)output_items[0];
// Use async receive_from to get data from UDP buffer and wait
// on a conditional signal before proceeding. We use this
// because the conditional wait is interruptible while a
// synchronous receive_from is not.
boost::unique_lock<boost::mutex> lock(d_udp_mutex);
// use timed_wait to avoid permanent blocking in the work function
d_cond_wait.timed_wait(lock, boost::posix_time::milliseconds(10));
if (d_residual < 0) {
return d_residual;
}
int bytes_left_in_buffer = (int)(d_residual - d_sent);
int bytes_to_send = std::min<int>(d_itemsize * noutput_items, bytes_left_in_buffer);
// Copy the received data in the residual buffer to the output stream
memcpy(out, d_residbuf.data() + d_sent, bytes_to_send);
int nitems = bytes_to_send / d_itemsize;
// Keep track of where we are if we don't have enough output
// space to send all the data in the residbuf.
if (bytes_to_send == bytes_left_in_buffer) {
d_residual = 0;
d_sent = 0;
} else {
d_sent += bytes_to_send;
}
return nitems;
}
} /* namespace blocks */
} /* namespace gr */
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