sub_msg_source_impl.cc

/* -*- c++ -*- */
/*
 * Copyright 2013,2014,2019 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio.
 *
 * This 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, or (at your option)
 * any later version.
 *
 * This software 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "sub_msg_source_impl.h"
#include "tag_headers.h"
#include <gnuradio/io_signature.h>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/thread/thread.hpp>

namespace gr {
namespace zeromq {

sub_msg_source::sptr sub_msg_source::make(char* address, int timeout)
{
    return gnuradio::get_initial_sptr(new sub_msg_source_impl(address, timeout));
}

sub_msg_source_impl::sub_msg_source_impl(char* address, int timeout)
    : gr::block("sub_msg_source",
                gr::io_signature::make(0, 0, 0),
                gr::io_signature::make(0, 0, 0)),
      d_timeout(timeout),
      d_port(pmt::mp("out"))
{
    int major, minor, patch;
    zmq::version(&major, &minor, &patch);

    if (major < 3) {
        d_timeout = timeout * 1000;
    }

    d_context = new zmq::context_t(1);
    d_socket = new zmq::socket_t(*d_context, ZMQ_SUB);

    d_socket->setsockopt(ZMQ_SUBSCRIBE, "", 0);
    d_socket->connect(address);

    message_port_register_out(d_port);
}

sub_msg_source_impl::~sub_msg_source_impl()
{
    d_socket->close();
    delete d_socket;
    delete d_context;
}

bool sub_msg_source_impl::start()
{
    d_finished = false;
    d_thread = new boost::thread(boost::bind(&sub_msg_source_impl::readloop, this));
    return true;
}

bool sub_msg_source_impl::stop()
{
    d_finished = true;
    d_thread->join();
    return true;
}

void sub_msg_source_impl::readloop()
{
    while (!d_finished) {

        zmq::pollitem_t items[] = { { static_cast<void*>(*d_socket), 0, ZMQ_POLLIN, 0 } };
        zmq::poll(&items[0], 1, d_timeout);

        //  If we got a reply, process
        if (items[0].revents & ZMQ_POLLIN) {

            // Receive data
            zmq::message_t msg;
#if USE_NEW_CPPZMQ_SEND_RECV
            d_socket->recv(msg);
#else
            d_socket->recv(&msg);
#endif
            std::string buf(static_cast<char*>(msg.data()), msg.size());
            std::stringbuf sb(buf);
            pmt::pmt_t m = pmt::deserialize(sb);

            message_port_pub(d_port, m);
        } else {
            boost::this_thread::sleep(boost::posix_time::microseconds(100));
        }
    }
}

} /* namespace zeromq */
} /* namespace gr */