rep_sink_impl.cc

/* -*- c++ -*- */
/*
 * Copyright 2013,2014,2019 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 "rep_sink_impl.h"
#include "tag_headers.h"
#include <gnuradio/io_signature.h>

namespace gr {
namespace zeromq {

rep_sink::sptr rep_sink::make(
    size_t itemsize, size_t vlen, char* address, int timeout, bool pass_tags, int hwm)
{
    return gnuradio::make_block_sptr<rep_sink_impl>(
        itemsize, vlen, address, timeout, pass_tags, hwm);
}

rep_sink_impl::rep_sink_impl(
    size_t itemsize, size_t vlen, char* address, int timeout, bool pass_tags, int hwm)
    : gr::sync_block("rep_sink",
                     gr::io_signature::make(1, 1, itemsize * vlen),
                     gr::io_signature::make(0, 0, 0)),
      base_sink_impl(ZMQ_REP, itemsize, vlen, address, timeout, pass_tags, hwm)
{
    /* All is delegated */
}

int rep_sink_impl::work(int noutput_items,
                        gr_vector_const_void_star& input_items,
                        gr_vector_void_star& output_items)
{
    const uint8_t* in = (const uint8_t*)input_items[0];
    bool first = true;
    int done = 0;

    /* Process as much as we can */
    while (1) {
        /* Wait for a small time (FIXME: scheduler can't wait for us) */
        /* We only wait if its the first iteration, for the others we'll
         * let the scheduler retry */
        zmq::pollitem_t items[] = { { static_cast<void*>(d_socket), 0, ZMQ_POLLIN, 0 } };
        zmq::poll(&items[0], 1, first ? d_timeout : 0);

        /* If we don't have anything, we're done */
        if (!(items[0].revents & ZMQ_POLLIN))
            break;

        /* Get and parse the request */
        zmq::message_t request;
#if USE_NEW_CPPZMQ_SEND_RECV
        bool ok = bool(d_socket.recv(request));
#else
        bool ok = d_socket.recv(&request);
#endif
        if (!ok) {
            // Should not happen, we've checked POLLIN.
            GR_LOG_ERROR(d_logger, "Failed to receive message.");
            break;
        }

        int nitems_send = noutput_items - done;
        if (request.size() >= sizeof(uint32_t)) {
            int req = (int)*(static_cast<uint32_t*>(request.data()));
            nitems_send = std::min(nitems_send, req);
        }

        /* Delegate the actual send */
        done += send_message(in + (done * d_vsize), nitems_send, nitems_read(0) + done);

        /* Not the first anymore */
        first = false;
    }

    return done;
}
} /* namespace zeromq */
} /* namespace gr */

// vim: ts=2 sw=2 expandtab