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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
#include <new>
#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#endif
#include "pgm_receiver.hpp"
#include "err.hpp"
#include "stdint.hpp"
#include "wire.hpp"
#include "i_inout.hpp"
zmq::pgm_receiver_t::pgm_receiver_t (class io_thread_t *parent_,
const options_t &options_) :
io_object_t (parent_),
pgm_socket (true, options_),
options (options_),
inout (NULL),
mru_decoder (NULL),
pending_bytes (0)
{
}
zmq::pgm_receiver_t::~pgm_receiver_t ()
{
// Destructor should not be called before unplug.
zmq_assert (peers.empty ());
}
int zmq::pgm_receiver_t::init (bool udp_encapsulation_, const char *network_)
{
return pgm_socket.init (udp_encapsulation_, network_);
}
void zmq::pgm_receiver_t::plug (i_inout *inout_)
{
// Retrieve PGM fds and start polling.
int socket_fd;
int waiting_pipe_fd;
pgm_socket.get_receiver_fds (&socket_fd, &waiting_pipe_fd);
socket_handle = add_fd (socket_fd);
pipe_handle = add_fd (waiting_pipe_fd);
set_pollin (pipe_handle);
set_pollin (socket_handle);
inout = inout_;
}
void zmq::pgm_receiver_t::unplug ()
{
// Delete decoders.
for (peers_t::iterator it = peers.begin (); it != peers.end (); it++) {
if (it->second.decoder != NULL)
delete it->second.decoder;
}
peers.clear ();
mru_decoder = NULL;
pending_bytes = 0;
// Stop polling.
rm_fd (socket_handle);
rm_fd (pipe_handle);
inout = NULL;
}
void zmq::pgm_receiver_t::revive ()
{
zmq_assert (false);
}
void zmq::pgm_receiver_t::resume_input ()
{
// It is possible that the most recently used decoder
// processed the whole buffer but failed to write
// the last message into the pipe.
if (pending_bytes == 0) {
if (mru_decoder != NULL)
mru_decoder->process_buffer (NULL, 0);
return;
}
zmq_assert (mru_decoder != NULL);
zmq_assert (pending_ptr != NULL);
// Ask the decoder to process remaining data.
size_t n = mru_decoder->process_buffer (pending_ptr, pending_bytes);
pending_bytes -= n;
if (pending_bytes > 0)
return;
// Resume polling.
set_pollin (pipe_handle);
set_pollin (socket_handle);
in_event ();
}
void zmq::pgm_receiver_t::in_event ()
{
// Read data from the underlying pgm_socket.
unsigned char *data = NULL;
const pgm_tsi_t *tsi = NULL;
zmq_assert (pending_bytes == 0);
// TODO: This loop can effectively block other engines in the same I/O
// thread in the case of high load.
while (true) {
// Get new batch of data.
ssize_t received = pgm_socket.receive ((void**) &data, &tsi);
// No data to process. This may happen if the packet received is
// neither ODATA nor ODATA.
if (received == 0)
break;
// Find the peer based on its TSI.
peers_t::iterator it = peers.find (*tsi);
// Data loss. Delete decoder and mark the peer as disjoint.
if (received == -1) {
if (it != peers.end ()) {
it->second.joined = false;
if (it->second.decoder == mru_decoder)
mru_decoder = NULL;
if (it->second.decoder != NULL) {
delete it->second.decoder;
it->second.decoder = NULL;
}
}
break;
}
// New peer. Add it to the list of know but unjoint peers.
if (it == peers.end ()) {
peer_info_t peer_info = {false, NULL};
it = peers.insert (std::make_pair (*tsi, peer_info)).first;
}
// Read the offset of the fist message in the current packet.
zmq_assert ((size_t) received >= sizeof (uint16_t));
uint16_t offset = get_uint16 (data);
data += sizeof (uint16_t);
received -= sizeof (uint16_t);
// Join the stream if needed.
if (!it->second.joined) {
// There is no beginning of the message in current packet.
// Ignore the data.
if (offset == 0xffff)
continue;
zmq_assert (offset <= received);
zmq_assert (it->second.decoder == NULL);
// We have to move data to the begining of the first message.
data += offset;
received -= offset;
// Mark the stream as joined.
it->second.joined = true;
// Create and connect decoder for the peer.
it->second.decoder = new (std::nothrow) zmq_decoder_t (0);
it->second.decoder->set_inout (inout);
}
mru_decoder = it->second.decoder;
// Push all the data to the decoder.
ssize_t processed = it->second.decoder->process_buffer (data, received);
if (processed < received) {
// Save some state so we can resume the decoding process later.
pending_bytes = received - processed;
pending_ptr = data + processed;
// Stop polling.
reset_pollin (pipe_handle);
reset_pollin (socket_handle);
break;
}
}
// Flush any messages decoder may have produced.
inout->flush ();
}
#endif
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