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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 "pgm_receiver.hpp"
#include "err.hpp"
#include "stdint.hpp"
#include "wire.hpp"
#include "i_inout.hpp"
//#define PGM_RECEIVER_DEBUG
//#define PGM_RECEIVER_DEBUG_LEVEL 1
// level 1 = key behaviour
// level 2 = processing flow
// level 4 = infos
#ifndef PGM_RECEIVER_DEBUG
# define zmq_log(n, ...) while (0)
#else
# define zmq_log(n, ...) do { if ((n) <= PGM_RECEIVER_DEBUG_LEVEL) \
{ printf (__VA_ARGS__);}} while (0)
#endif
zmq::pgm_receiver_t::pgm_receiver_t (class io_thread_t *parent_,
const options_t &options_, const char *session_name_) :
io_object_t (parent_),
decoder (NULL),
pgm_socket (true, options_),
options (options_),
session_name (session_name_),
joined (false),
inout (NULL)
{
}
zmq::pgm_receiver_t::~pgm_receiver_t ()
{
if (decoder)
delete decoder;
}
int zmq::pgm_receiver_t::init (bool udp_encapsulation_, const char *network_)
{
decoder = new zmq_decoder_t;
zmq_assert (decoder);
return pgm_socket.init (udp_encapsulation_, network_);
}
void zmq::pgm_receiver_t::plug (i_inout *inout_)
{
// Allocate 2 fds one for socket second for waiting pipe.
int socket_fd;
int waiting_pipe_fd;
decoder->set_inout (inout_);
// Fill socket_fd and waiting_pipe_fd from PGM transport
pgm_socket.get_receiver_fds (&socket_fd, &waiting_pipe_fd);
// Add socket_fd into poller.
socket_handle = add_fd (socket_fd);
// Add waiting_pipe_fd into poller.
pipe_handle = add_fd (waiting_pipe_fd);
// Set POLLIN for both handlers.
set_pollin (pipe_handle);
set_pollin (socket_handle);
inout = inout_;
}
void zmq::pgm_receiver_t::unplug ()
{
rm_fd (socket_handle);
rm_fd (pipe_handle);
decoder->set_inout (NULL);
inout = NULL;
}
void zmq::pgm_receiver_t::revive ()
{
zmq_assert (false);
}
void zmq::pgm_receiver_t::reconnect ()
{
// Save inout ptr.
i_inout *inout_tmp = inout;
// PGM receiver is not joined anymore.
joined = false;
// Unplug - plug PGM transport.
unplug ();
delete decoder;
decoder = new zmq_decoder_t;
zmq_assert (decoder);
plug (inout_tmp);
}
// POLLIN event from socket or waiting_pipe.
void zmq::pgm_receiver_t::in_event ()
{
void *data_with_offset;
ssize_t nbytes = 0;
// Read all data from pgm socket.
while ((nbytes = receive_with_offset (&data_with_offset)) > 0) {
// Push all the data to the decoder.
decoder->write ((unsigned char*)data_with_offset, nbytes);
}
// Flush any messages decoder may have produced to the dispatcher.
inout->flush ();
// Data loss detected.
if (nbytes == -1) {
// Recreate PGM transport.
reconnect ();
}
}
void zmq::pgm_receiver_t::out_event ()
{
zmq_assert (false);
}
ssize_t zmq::pgm_receiver_t::receive_with_offset
(void **data_)
{
// Data from PGM socket.
void *rd = NULL;
unsigned char *raw_data = NULL;
// Read data from underlying pgm_socket.
ssize_t nbytes = pgm_socket.receive ((void**) &rd);
raw_data = (unsigned char*) rd;
// No ODATA or RDATA.
if (!nbytes)
return 0;
// Data loss.
if (nbytes == -1) {
return -1;
}
// Read offset of the fist message in current APDU.
uint16_t apdu_offset = get_uint16 (raw_data);
// Shift raw_data & decrease nbytes by the first message offset
// information (sizeof uint16_t).
*data_ = raw_data + sizeof (uint16_t);
nbytes -= sizeof (uint16_t);
// There is not beginning of the message in current APDU and we
// are not joined jet -> throwing data.
if (apdu_offset == 0xFFFF && !joined) {
*data_ = NULL;
return 0;
}
// Now is the possibility to join the stream.
if (!joined) {
// We have to move data to the begining of the first message.
*data_ = (unsigned char *)*data_ + apdu_offset;
nbytes -= apdu_offset;
// Joined the stream.
joined = true;
zmq_log (2, "joined into the stream, %s(%i)\n",
__FILE__, __LINE__);
}
return nbytes;
}
#endif
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