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/*
Copyright (c) 2007-2009 FastMQ Inc.
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
#include <iostream>
#include "io_thread.hpp"
#include "pgm_sender.hpp"
#include "err.hpp"
#include "wire.hpp"
//#define PGM_SENDER_DEBUG
//#define PGM_SENDER_DEBUG_LEVEL 1
// level 1 = key behaviour
// level 2 = processing flow
// level 4 = infos
#ifndef PGM_SENDER_DEBUG
# define zmq_log(n, ...) while (0)
#else
# define zmq_log(n, ...) do { if ((n) <= PGM_SENDER_DEBUG_LEVEL) \
{ printf (__VA_ARGS__);}} while (0)
#endif
#ifdef ZMQ_HAVE_LINUX
zmq::pgm_sender_t::pgm_sender_t (io_thread_t *parent_,
const options_t &options_, const char *session_name_) :
io_object_t (parent_),
pgm_socket (false, options_),
options (options_),
session_name (session_name_),
inout (NULL),
out_buffer (NULL),
out_buffer_size (0),
write_size (0),
write_pos (0),
first_message_offset (-1)
{
}
int zmq::pgm_sender_t::init (bool udp_encapsulation_, const char *network_)
{
return pgm_socket.init (udp_encapsulation_, network_);
}
void zmq::pgm_sender_t::plug (i_inout *inout_)
{
// Alocate 2 fds for PGM socket.
int downlink_socket_fd;
int uplink_socket_fd;
encoder.set_inout (inout_);
// Fill fds from PGM transport.
pgm_socket.get_sender_fds (&downlink_socket_fd, &uplink_socket_fd);
// Add downlink_socket_fd into poller.
handle = add_fd (downlink_socket_fd);
// Add uplink_socket_fd into the poller.
uplink_handle = add_fd (uplink_socket_fd);
// Set POLLIN. We wont never want to stop polling for uplink = we never
// want to stop porocess NAKs.
set_pollin (uplink_handle);
// Set POLLOUT for downlink_socket_handle.
set_pollout (handle);
inout = inout_;
}
void zmq::pgm_sender_t::unplug ()
{
rm_fd (handle);
rm_fd (uplink_handle);
encoder.set_inout (NULL);
inout = NULL;
}
void zmq::pgm_sender_t::revive ()
{
set_pollout (handle);
out_event ();
}
zmq::pgm_sender_t::~pgm_sender_t ()
{
if (out_buffer) {
pgm_socket.free_buffer (out_buffer);
}
}
// In event on sender side means NAK or SPMR receiving from some peer.
void zmq::pgm_sender_t::in_event ()
{
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_pos == write_size) {
// Get buffer if we do not have already one.
if (!out_buffer) {
out_buffer = (unsigned char*)
pgm_socket.get_buffer (&out_buffer_size);
}
assert (out_buffer_size > 0);
// First two bytes /sizeof (uint16_t)/ are used to store message
// offset in following steps.
write_size = encoder.read (out_buffer + sizeof (uint16_t),
out_buffer_size - sizeof (uint16_t), &first_message_offset);
write_pos = 0;
// If there are no data to write stop polling for output.
if (!write_size) {
reset_pollout (handle);
} else {
// Addning uint16_t for offset in a case when encoder returned > 0B.
write_size += sizeof (uint16_t);
}
}
// If there are any data to write, write them into the socket.
// Note that all data has to written in one write_one_pkt_with_offset call.
if (write_pos < write_size) {
size_t nbytes = write_one_pkt_with_offset (out_buffer + write_pos,
write_size - write_pos, (uint16_t) first_message_offset);
// We can write all data or 0 which means rate limit reached.
if (write_size - write_pos != nbytes && nbytes != 0) {
zmq_log (2, "write_size - write_pos %i, nbytes %i, %s(%i)",
(int)(write_size - write_pos), (int)nbytes, __FILE__, __LINE__);
assert (false);
}
// PGM rate limit reached nbytes is 0.
if (!nbytes) {
zmq_log (1, "pgm rate limit reached, %s(%i)\n", __FILE__, __LINE__);
}
// After sending data slice is owned by tx window.
if (nbytes) {
out_buffer = NULL;
}
write_pos += nbytes;
}
}
size_t zmq::pgm_sender_t::write_one_pkt_with_offset (unsigned char *data_,
size_t size_, uint16_t offset_)
{
zmq_log (4, "data_size %i, first message offset %i, %s(%i)\n",
(int) size_, offset_, __FILE__, __LINE__);
// Put offset information in the buffer.
put_uint16 (data_, offset_);
// Send data.
size_t nbytes = pgm_socket.send (data_, size_);
return nbytes;
}
#endif
#endif
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