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/*
Copyright (c) 2007-2010 iMatix Corporation
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "platform.hpp"
#if defined ZMQ_HAVE_OPENPGM
#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#endif
#include <stdlib.h>
#include "io_thread.hpp"
#include "pgm_sender.hpp"
#include "err.hpp"
#include "wire.hpp"
#include "stdint.hpp"
zmq::pgm_sender_t::pgm_sender_t (io_thread_t *parent_,
const options_t &options_) :
io_object_t (parent_),
encoder (0),
pgm_socket (false, options_),
options (options_),
out_buffer (NULL),
out_buffer_size (0),
write_size (0)
{
}
int zmq::pgm_sender_t::init (bool udp_encapsulation_, const char *network_)
{
int rc = pgm_socket.init (udp_encapsulation_, network_);
if (rc != 0)
return rc;
out_buffer_size = pgm_socket.get_max_tsdu_size ();
out_buffer = (unsigned char*) malloc (out_buffer_size);
zmq_assert (out_buffer);
return rc;
}
void zmq::pgm_sender_t::plug (i_inout *inout_)
{
// Alocate 2 fds for PGM socket.
int downlink_socket_fd = 0;
int uplink_socket_fd = 0;
int rdata_notify_fd = 0;
int pending_notify_fd = 0;
encoder.set_inout (inout_);
// Fill fds from PGM transport and add them to the poller.
pgm_socket.get_sender_fds (&downlink_socket_fd, &uplink_socket_fd,
&rdata_notify_fd, &pending_notify_fd);
handle = add_fd (downlink_socket_fd);
uplink_handle = add_fd (uplink_socket_fd);
rdata_notify_handle = add_fd (rdata_notify_fd);
pending_notify_handle = add_fd (pending_notify_fd);
// Set POLLIN. We wont never want to stop polling for uplink = we never
// want to stop porocess NAKs.
set_pollin (uplink_handle);
set_pollin (rdata_notify_handle);
set_pollin (pending_notify_handle);
// Set POLLOUT for downlink_socket_handle.
set_pollout (handle);
}
void zmq::pgm_sender_t::unplug ()
{
rm_fd (handle);
rm_fd (uplink_handle);
rm_fd (rdata_notify_handle);
rm_fd (pending_notify_handle);
encoder.set_inout (NULL);
}
void zmq::pgm_sender_t::revive ()
{
set_pollout (handle);
out_event ();
}
void zmq::pgm_sender_t::resume_input ()
{
zmq_assert (false);
}
zmq::pgm_sender_t::~pgm_sender_t ()
{
if (out_buffer) {
free (out_buffer);
out_buffer = NULL;
}
}
void zmq::pgm_sender_t::in_event ()
{
// In event on sender side means NAK or SPMR receiving from some peer.
pgm_socket.process_upstream ();
}
void zmq::pgm_sender_t::out_event ()
{
// POLLOUT event from send socket. If write buffer is empty,
// try to read new data from the encoder.
if (write_size == 0) {
// First two bytes (sizeof uint16_t) are used to store message
// offset in following steps. Note that by passing our buffer to
// the get data function we prevent it from returning its own buffer.
unsigned char *bf = out_buffer + sizeof (uint16_t);
size_t bfsz = out_buffer_size - sizeof (uint16_t);
int offset = -1;
encoder.get_data (&bf, &bfsz, &offset);
// If there are no data to write stop polling for output.
if (!bfsz) {
reset_pollout (handle);
return;
}
// Put offset information in the buffer.
write_size = bfsz + sizeof (uint16_t);
put_uint16 (out_buffer, offset == -1 ? 0xffff : (uint16_t) offset);
}
// Send the data.
size_t nbytes = pgm_socket.send (out_buffer, write_size);
// We can write either all data or 0 which means rate limit reached.
if (nbytes == write_size)
write_size = 0;
else
zmq_assert (nbytes == 0);
}
#endif
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