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/*
Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
This file is part of libzmq, the ZeroMQ core engine in C++.
libzmq is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
As a special exception, the Contributors give you permission to link
this library with independent modules to produce an executable,
regardless of the license terms of these independent modules, and to
copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the
terms and conditions of the license of that module. An independent
module is a module which is not derived from or based on this library.
If you modify this library, you must extend this exception to your
version of the library.
libzmq 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 "precompiled.hpp"
#include <string.h>
#include "radio.hpp"
#include "macros.hpp"
#include "pipe.hpp"
#include "err.hpp"
#include "msg.hpp"
zmq::radio_t::radio_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
socket_base_t (parent_, tid_, sid_, true),
_lossy (true)
{
options.type = ZMQ_RADIO;
}
zmq::radio_t::~radio_t ()
{
}
void zmq::radio_t::xattach_pipe (pipe_t *pipe_,
bool subscribe_to_all_,
bool locally_initiated_)
{
LIBZMQ_UNUSED (subscribe_to_all_);
LIBZMQ_UNUSED (locally_initiated_);
zmq_assert (pipe_);
// Don't delay pipe termination as there is no one
// to receive the delimiter.
pipe_->set_nodelay ();
_dist.attach (pipe_);
if (subscribe_to_all_)
_udp_pipes.push_back (pipe_);
// The pipe is active when attached. Let's read the subscriptions from
// it, if any.
else
xread_activated (pipe_);
}
void zmq::radio_t::xread_activated (pipe_t *pipe_)
{
// There are some subscriptions waiting. Let's process them.
msg_t msg;
while (pipe_->read (&msg)) {
// Apply the subscription to the trie
if (msg.is_join () || msg.is_leave ()) {
std::string group = std::string (msg.group ());
if (msg.is_join ())
_subscriptions.ZMQ_MAP_INSERT_OR_EMPLACE (ZMQ_MOVE (group),
pipe_);
else {
std::pair<subscriptions_t::iterator, subscriptions_t::iterator>
range = _subscriptions.equal_range (group);
for (subscriptions_t::iterator it = range.first;
it != range.second; ++it) {
if (it->second == pipe_) {
_subscriptions.erase (it);
break;
}
}
}
}
msg.close ();
}
}
void zmq::radio_t::xwrite_activated (pipe_t *pipe_)
{
_dist.activated (pipe_);
}
int zmq::radio_t::xsetsockopt (int option_,
const void *optval_,
size_t optvallen_)
{
if (optvallen_ != sizeof (int) || *static_cast<const int *> (optval_) < 0) {
errno = EINVAL;
return -1;
}
if (option_ == ZMQ_XPUB_NODROP)
_lossy = (*static_cast<const int *> (optval_) == 0);
else {
errno = EINVAL;
return -1;
}
return 0;
}
void zmq::radio_t::xpipe_terminated (pipe_t *pipe_)
{
for (subscriptions_t::iterator it = _subscriptions.begin (),
end = _subscriptions.end ();
it != end;) {
if (it->second == pipe_) {
#if __cplusplus >= 201103L
it = _subscriptions.erase (it);
#else
_subscriptions.erase (it++);
#endif
} else {
++it;
}
}
{
const udp_pipes_t::iterator end = _udp_pipes.end ();
const udp_pipes_t::iterator it =
std::find (_udp_pipes.begin (), end, pipe_);
if (it != end)
_udp_pipes.erase (it);
}
_dist.pipe_terminated (pipe_);
}
int zmq::radio_t::xsend (msg_t *msg_)
{
// Radio sockets do not allow multipart data (ZMQ_SNDMORE)
if (msg_->flags () & msg_t::more) {
errno = EINVAL;
return -1;
}
_dist.unmatch ();
std::pair<subscriptions_t::iterator, subscriptions_t::iterator> range =
_subscriptions.equal_range (std::string (msg_->group ()));
for (subscriptions_t::iterator it = range.first; it != range.second; ++it)
_dist.match (it->second);
for (udp_pipes_t::iterator it = _udp_pipes.begin (),
end = _udp_pipes.end ();
it != end; ++it)
_dist.match (*it);
int rc = -1;
if (_lossy || _dist.check_hwm ()) {
if (_dist.send_to_matching (msg_) == 0) {
rc = 0; // Yay, sent successfully
}
} else
errno = EAGAIN;
return rc;
}
bool zmq::radio_t::xhas_out ()
{
return _dist.has_out ();
}
int zmq::radio_t::xrecv (msg_t *msg_)
{
// Messages cannot be received from PUB socket.
LIBZMQ_UNUSED (msg_);
errno = ENOTSUP;
return -1;
}
bool zmq::radio_t::xhas_in ()
{
return false;
}
zmq::radio_session_t::radio_session_t (io_thread_t *io_thread_,
bool connect_,
socket_base_t *socket_,
const options_t &options_,
address_t *addr_) :
session_base_t (io_thread_, connect_, socket_, options_, addr_),
_state (group)
{
}
zmq::radio_session_t::~radio_session_t ()
{
}
int zmq::radio_session_t::push_msg (msg_t *msg_)
{
if (msg_->flags () & msg_t::command) {
char *command_data = static_cast<char *> (msg_->data ());
const size_t data_size = msg_->size ();
int group_length;
char *group;
msg_t join_leave_msg;
int rc;
// Set the msg type to either JOIN or LEAVE
if (data_size >= 5 && memcmp (command_data, "\4JOIN", 5) == 0) {
group_length = static_cast<int> (data_size) - 5;
group = command_data + 5;
rc = join_leave_msg.init_join ();
} else if (data_size >= 6 && memcmp (command_data, "\5LEAVE", 6) == 0) {
group_length = static_cast<int> (data_size) - 6;
group = command_data + 6;
rc = join_leave_msg.init_leave ();
}
// If it is not a JOIN or LEAVE just push the message
else
return session_base_t::push_msg (msg_);
errno_assert (rc == 0);
// Set the group
rc = join_leave_msg.set_group (group, group_length);
errno_assert (rc == 0);
// Close the current command
rc = msg_->close ();
errno_assert (rc == 0);
// Push the join or leave command
*msg_ = join_leave_msg;
return session_base_t::push_msg (msg_);
}
return session_base_t::push_msg (msg_);
}
int zmq::radio_session_t::pull_msg (msg_t *msg_)
{
if (_state == group) {
int rc = session_base_t::pull_msg (&_pending_msg);
if (rc != 0)
return rc;
const char *group = _pending_msg.group ();
int length = static_cast<int> (strlen (group));
// First frame is the group
rc = msg_->init_size (length);
errno_assert (rc == 0);
msg_->set_flags (msg_t::more);
memcpy (msg_->data (), group, length);
// Next status is the body
_state = body;
return 0;
}
*msg_ = _pending_msg;
_state = group;
return 0;
}
void zmq::radio_session_t::reset ()
{
session_base_t::reset ();
_state = group;
}