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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 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 <new>
#include "platform.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#else
#include <sys/types.h>
#include <unistd.h>
#endif
#include "zmq_connecter.hpp"
#include "zmq_engine.hpp"
#include "zmq_init.hpp"
#include "io_thread.hpp"
#include "err.hpp"
zmq::zmq_connecter_t::zmq_connecter_t (class io_thread_t *io_thread_,
class session_t *session_, const options_t &options_,
const char *protocol_, const char *address_, bool wait_) :
own_t (io_thread_, options_),
io_object_t (io_thread_),
handle_valid (false),
wait (wait_),
session (session_),
current_reconnect_ivl(options.reconnect_ivl)
{
int rc = tcp_connecter.set_address (protocol_, address_);
zmq_assert (rc == 0);
}
zmq::zmq_connecter_t::~zmq_connecter_t ()
{
if (wait)
cancel_timer (reconnect_timer_id);
if (handle_valid)
rm_fd (handle);
}
void zmq::zmq_connecter_t::process_plug ()
{
if (wait)
add_reconnect_timer();
else
start_connecting ();
}
void zmq::zmq_connecter_t::in_event ()
{
// We are not polling for incomming data, so we are actually called
// because of error here. However, we can get error on out event as well
// on some platforms, so we'll simply handle both events in the same way.
out_event ();
}
void zmq::zmq_connecter_t::out_event ()
{
fd_t fd = tcp_connecter.connect ();
rm_fd (handle);
handle_valid = false;
// Handle the error condition by attempt to reconnect.
if (fd == retired_fd) {
tcp_connecter.close ();
wait = true;
add_reconnect_timer();
return;
}
// 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 an init object.
zmq_init_t *init = new (std::nothrow) zmq_init_t (io_thread, NULL,
session, fd, options);
alloc_assert (init);
launch_sibling (init);
// Shut the connecter down.
terminate ();
}
void zmq::zmq_connecter_t::timer_event (int id_)
{
zmq_assert (id_ == reconnect_timer_id);
wait = false;
start_connecting ();
}
void zmq::zmq_connecter_t::start_connecting ()
{
// Open the connecting socket.
int rc = tcp_connecter.open ();
// Connect may succeed in synchronous manner.
if (rc == 0) {
handle = add_fd (tcp_connecter.get_fd ());
handle_valid = true;
out_event ();
return;
}
// Connection establishment may be dealyed. Poll for its completion.
else if (rc == -1 && errno == EAGAIN) {
handle = add_fd (tcp_connecter.get_fd ());
handle_valid = true;
set_pollout (handle);
return;
}
// Handle any other error condition by eventual reconnect.
wait = true;
add_reconnect_timer();
}
void zmq::zmq_connecter_t::add_reconnect_timer()
{
add_timer (get_new_reconnect_ivl(), reconnect_timer_id);
}
int zmq::zmq_connecter_t::get_new_reconnect_ivl ()
{
#if defined ZMQ_HAVE_WINDOWS
int pid = (int) GetCurrentProcessId ();
#else
int pid = (int) getpid ();
#endif
// The new interval is the current interval + random value.
int this_interval = current_reconnect_ivl +
((pid * 13) % options.reconnect_ivl);
// Only change the current reconnect interval if the maximum reconnect
// interval was set and if it's larger than the reconnect interval.
if (options.reconnect_ivl_max > 0 &&
options.reconnect_ivl_max > options.reconnect_ivl) {
// Calculate the next interval
current_reconnect_ivl = current_reconnect_ivl * 2;
if(current_reconnect_ivl >= options.reconnect_ivl_max) {
current_reconnect_ivl = options.reconnect_ivl_max;
}
}
return this_interval;
}
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