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/* -*- c++ -*- */
/*
* Copyright 2013,2014 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 <gnuradio/io_signature.h>
#include "sub_source_impl.h"
namespace gr {
namespace zeromq {
sub_source::sptr
sub_source::make(size_t itemsize, size_t vlen, char *address, int timeout)
{
return gnuradio::get_initial_sptr
(new sub_source_impl(itemsize, vlen, address, timeout));
}
sub_source_impl::sub_source_impl(size_t itemsize, size_t vlen, char *address, int timeout)
: gr::sync_block("sub_source",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(1, 1, itemsize * vlen)),
d_itemsize(itemsize), d_vlen(vlen), d_timeout(timeout)
{
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);
//int time = 0;
d_socket->setsockopt(ZMQ_SUBSCRIBE, "", 0);
d_socket->connect (address);
}
/*
* Our virtual destructor.
*/
sub_source_impl::~sub_source_impl()
{
d_socket->close();
delete d_socket;
delete d_context;
}
int
sub_source_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
char *out = (char*)output_items[0];
zmq::pollitem_t items[] = { { *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;
d_socket->recv(&msg);
// Deserialize header data / tags
std::istringstream iss( std::string(static_cast<char*>(msg.data()), msg.size()));
uint64_t rcv_offset;
size_t rcv_ntags;
iss.read( (char*)&rcv_offset, sizeof(uint64_t ) );
iss.read( (char*)&rcv_ntags, sizeof(size_t ) );
for(size_t i=0; i<rcv_ntags; i++){
uint64_t tag_offset;
iss.read( (char*)&tag_offset, sizeof(uint64_t ) );
std::stringbuf sb( iss.str() );
pmt::pmt_t key = pmt::deserialize( sb );
pmt::pmt_t val = pmt::deserialize( sb );
pmt::pmt_t src = pmt::deserialize( sb );
uint64_t new_tag_offset = tag_offset + nitems_read(0) - rcv_offset;
add_item_tag(0, new_tag_offset, key, val, src);
iss.str(sb.str());
}
// Pass sample data along
std::vector<char> samp(iss.gcount());
iss.read( &samp[0], iss.gcount() );
// Copy to ouput buffer and return
if (samp.size() >= d_itemsize*d_vlen*noutput_items) {
memcpy(out, (void *)&samp[0], d_itemsize*d_vlen*noutput_items);
return noutput_items;
}
else {
memcpy(out, (void *)&samp[0], samp.size());
return samp.size()/(d_itemsize*d_vlen);
}
}
else {
return 0; // FIXME: someday when the scheduler does all the poll/selects
}
}
} /* namespace zeromq */
} /* namespace gr */
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