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/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "connect_session.hpp"
#include "zmq_connecter.hpp"
#include "pgm_sender.hpp"
#include "pgm_receiver.hpp"
#include "err.hpp"
zmq::connect_session_t::connect_session_t (class io_thread_t *io_thread_,
class socket_base_t *socket_, const options_t &options_,
const char *protocol_, const char *address_) :
session_t (io_thread_, socket_, options_),
protocol (protocol_),
address (address_),
connected (false)
{
}
zmq::connect_session_t::~connect_session_t ()
{
if (connected && !peer_identity.empty ())
unregister_session (peer_identity);
}
void zmq::connect_session_t::process_plug ()
{
// Start connection process immediately.
start_connecting (false);
}
void zmq::connect_session_t::start_connecting (bool wait_)
{
// Choose I/O thread to run connecter in. Given that we are already
// running in an I/O thread, there must be at least one available.
io_thread_t *io_thread = choose_io_thread (options.affinity);
zmq_assert (io_thread);
// Create the connecter object.
// Both TCP and IPC transports are using the same infrastructure.
if (protocol == "tcp" || protocol == "ipc") {
zmq_connecter_t *connecter = new (std::nothrow) zmq_connecter_t (
io_thread, this, options, protocol.c_str (), address.c_str (),
wait_);
alloc_assert (connecter);
launch_child (connecter);
return;
}
#if defined ZMQ_HAVE_OPENPGM
// Both PGM and EPGM transports are using the same infrastructure.
if (protocol == "pgm" || protocol == "epgm") {
// For EPGM transport with UDP encapsulation of PGM is used.
bool udp_encapsulation = (protocol == "epgm");
// At this point we'll create message pipes to the session straight
// away. There's no point in delaying it as no concept of 'connect'
// exists with PGM anyway.
if (options.type == ZMQ_PUB || options.type == ZMQ_XPUB) {
// PGM sender.
pgm_sender_t *pgm_sender = new (std::nothrow) pgm_sender_t (
io_thread, options);
alloc_assert (pgm_sender);
int rc = pgm_sender->init (udp_encapsulation, address.c_str ());
zmq_assert (rc == 0);
send_attach (this, pgm_sender, blob_t ());
}
else if (options.type == ZMQ_SUB || options.type == ZMQ_XSUB) {
// PGM receiver.
pgm_receiver_t *pgm_receiver = new (std::nothrow) pgm_receiver_t (
io_thread, options);
alloc_assert (pgm_receiver);
int rc = pgm_receiver->init (udp_encapsulation, address.c_str ());
zmq_assert (rc == 0);
send_attach (this, pgm_receiver, blob_t ());
}
else
zmq_assert (false);
return;
}
#endif
zmq_assert (false);
}
bool zmq::connect_session_t::xattached (const blob_t &peer_identity_)
{
// If there was no previous connection...
if (!connected) {
// Peer has transient identity.
if (peer_identity_.empty () || peer_identity_ [0] == 0) {
connected = true;
return true;
}
// Peer has strong identity. Let's register it and check whether noone
// else is using the same identity.
if (!register_session (peer_identity_, this)) {
log ("DPID: duplicate peer identity - disconnecting peer");
return false;
}
connected = true;
peer_identity = peer_identity_;
return true;
}
// New engine from listener can conflict with existing engine.
// Alternatively, new engine created by reconnection process can
// conflict with engine supplied by listener in the meantime.
if (has_engine ()) {
log ("DPID: duplicate peer identity - disconnecting peer");
return false;
}
// If there have been a connection before, we have to check whether
// peer's identity haven't changed in the meantime.
if ((peer_identity_.empty () || peer_identity_ [0] == 0) &&
peer_identity.empty ())
return true;
if (peer_identity != peer_identity_) {
log ("CHID: peer have changed identity - disconnecting peer");
return false;
}
return true;
}
bool zmq::connect_session_t::xdetached ()
{
// Reconnect.
start_connecting (true);
// Don't tear the session down.
return true;
}
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