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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 <string.h>
#include "zmq_init.hpp"
#include "zmq_engine.hpp"
#include "io_thread.hpp"
#include "session.hpp"
#include "uuid.hpp"
#include "err.hpp"
zmq::zmq_init_t::zmq_init_t (io_thread_t *parent_, socket_base_t *owner_,
fd_t fd_, const options_t &options_, bool reconnect_,
const char *protocol_, const char *address_, uint64_t session_ordinal_) :
owned_t (parent_, owner_),
sent (false),
received (false),
session_ordinal (session_ordinal_),
options (options_)
{
// Create the engine object for this connection.
engine = new (std::nothrow) zmq_engine_t (parent_, fd_, options,
reconnect_, protocol_, address_);
zmq_assert (engine);
}
zmq::zmq_init_t::~zmq_init_t ()
{
if (engine)
delete engine;
}
bool zmq::zmq_init_t::read (::zmq_msg_t *msg_)
{
// If the identity was already sent, do nothing.
if (sent)
return false;
// Send the identity.
int rc = zmq_msg_init_size (msg_, options.identity.size ());
zmq_assert (rc == 0);
memcpy (zmq_msg_data (msg_), options.identity.c_str (),
options.identity.size ());
sent = true;
// If initialisation is done, pass the engine to the session and
// destroy the init object.
finalise ();
return true;
}
bool zmq::zmq_init_t::write (::zmq_msg_t *msg_)
{
// If identity was already received, we are not interested
// in subsequent messages.
if (received)
return false;
// Retreieve the remote identity. If it's empty, generate a unique name.
if (!zmq_msg_size (msg_)) {
unsigned char identity [uuid_t::uuid_blob_len + 1];
identity [0] = 0;
memcpy (identity + 1, uuid_t ().to_blob (), uuid_t::uuid_blob_len);
peer_identity.assign (identity, uuid_t::uuid_blob_len + 1);
}
else {
peer_identity.assign ((const unsigned char*) zmq_msg_data (msg_),
zmq_msg_size (msg_));
}
received = true;
return true;
}
void zmq::zmq_init_t::flush ()
{
// Check if there's anything to flush.
if (!received)
return;
// If initialisation is done, pass the engine to the session and
// destroy the init object.
finalise ();
}
void zmq::zmq_init_t::detach (owned_t *reconnecter_)
{
// This function is called by engine when disconnection occurs.
// If required, launch the reconnecter.
if (reconnecter_) {
send_plug (reconnecter_);
send_own (owner, reconnecter_);
}
// The engine will destroy itself, so let's just drop the pointer here and
// start termination of the init object.
engine = NULL;
term ();
}
zmq::io_thread_t *zmq::zmq_init_t::get_io_thread ()
{
return choose_io_thread (options.affinity);
}
class zmq::socket_base_t *zmq::zmq_init_t::get_owner ()
{
return owner;
}
uint64_t zmq::zmq_init_t::get_ordinal ()
{
return session_ordinal;
}
void zmq::zmq_init_t::process_plug ()
{
zmq_assert (engine);
engine->plug (this);
}
void zmq::zmq_init_t::process_unplug ()
{
if (engine)
engine->unplug ();
}
void zmq::zmq_init_t::finalise ()
{
if (sent && received) {
// Disconnect the engine from the init object.
engine->unplug ();
session_t *session = NULL;
// If we have the session ordinal, let's use it to find the session.
// If it is not found, it means socket is already being shut down
// and the session have been deallocated.
// TODO: We should check whether the name of the peer haven't changed
// upon reconnection.
if (session_ordinal) {
session = owner->find_session (session_ordinal);
if (!session) {
term ();
return;
}
}
else {
// If the peer has a unique name, find the associated session.
// If it does not exist, create it.
zmq_assert (!peer_identity.empty ());
session = owner->find_session (peer_identity);
if (!session) {
session = new (std::nothrow) session_t (
choose_io_thread (options.affinity), owner, options,
peer_identity);
zmq_assert (session);
send_plug (session);
send_own (owner, session);
// Reserve a sequence number for following 'attach' command.
session->inc_seqnum ();
}
}
// No need to increment seqnum as it was already incremented above.
send_attach (session, engine, peer_identity, false);
// Destroy the init object.
engine = NULL;
term ();
}
}
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