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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 "connecter.hpp"
#include "io_thread.hpp"
#include "session.hpp"
#include "err.hpp"
#include "simple_semaphore.hpp"
#include "zmq_tcp_engine.hpp"
zs::connecter_t::connecter_t (io_thread_t *thread_, const char *addr_,
session_t *session_) :
io_object_t (thread_),
state (idle),
poller (NULL),
session (session_),
addr (addr_),
identity ("abcde"),
engine (NULL)
{
}
void zs::connecter_t::terminate ()
{
delete this;
}
void zs::connecter_t::shutdown ()
{
delete this;
}
zs::connecter_t::~connecter_t ()
{
}
void zs::connecter_t::process_reg (simple_semaphore_t *smph_)
{
// Fet poller pointer for further use.
zs_assert (!poller);
poller = get_poller ();
// Ask the session to register itself with the I/O thread. Note that
// the session is living in the same I/O thread, thus this results
// in a synchronous call.
session->inc_seqnum ();
send_reg (session, NULL);
// Unlock the application thread that created the connecter.
if (smph_)
smph_->post ();
// Manually trigger timer event which will launch asynchronous connect.
state = waiting;
timer_event ();
}
void zs::connecter_t::process_unreg (simple_semaphore_t *smph_)
{
// Unregister connecter/engine from the poller.
zs_assert (poller);
if (state == connecting)
poller->rm_fd (handle);
else if (state == waiting)
poller->cancel_timer (this);
else if (state == sending)
engine->terminate ();
// Unlock the application thread closing the connecter.
if (smph_)
smph_->post ();
}
void zs::connecter_t::in_event ()
{
// Error occured in asynchronous connect. Retry to connect after a while.
if (state == connecting) {
fd_t fd = tcp_connecter.connect ();
zs_assert (fd == retired_fd);
poller->rm_fd (handle);
poller->add_timer (this);
state = waiting;
return;
}
zs_assert (false);
}
void zs::connecter_t::out_event ()
{
if (state == connecting) {
fd_t fd = tcp_connecter.connect ();
if (fd == retired_fd) {
poller->rm_fd (handle);
poller->add_timer (this);
state = waiting;
return;
}
poller->rm_fd (handle);
engine = new zmq_tcp_engine_t (fd);
zs_assert (engine);
engine->attach (poller, this);
state = sending;
return;
}
zs_assert (false);
}
void zs::connecter_t::timer_event ()
{
zs_assert (state == waiting);
// Initiate async connect and start polling for its completion. If async
// connect fails instantly, try to reconnect after a while.
int rc = tcp_connecter.open (addr.c_str ());
if (rc == 0) {
state = connecting;
in_event ();
}
else if (rc == 1) {
handle = poller->add_fd (tcp_connecter.get_fd (), this);
poller->set_pollout (handle);
state = connecting;
}
else {
poller->add_timer (this);
state = waiting;
}
}
void zs::connecter_t::set_engine (struct i_engine *engine_)
{
engine = engine_;
}
bool zs::connecter_t::read (zs_msg *msg_)
{
zs_assert (state == sending);
// Deallocate old content of the message just in case.
zs_msg_close (msg_);
// Send the identity.
zs_msg_init_size (msg_, identity.size ());
memcpy (zs_msg_data (msg_), identity.c_str (), identity.size ());
// Ask engine to unregister from the poller.
i_engine *e = engine;
engine->detach ();
// Attach the engine to the session. (Note that this is actually
// a synchronous call.
session->inc_seqnum ();
send_engine (session, e);
state = idle;
return true;
}
bool zs::connecter_t::write (struct zs_msg *msg_)
{
// No incoming messages are accepted till identity is sent.
return false;
}
void zs::connecter_t::flush ()
{
// No incoming messages are accepted till identity is sent.
}
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