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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 "../c/zmq.h"
#include "sub.hpp"
#include "err.hpp"
zmq::sub_t::sub_t (class app_thread_t *parent_) :
socket_base_t (parent_)
{
}
zmq::sub_t::~sub_t ()
{
}
int zmq::sub_t::setsockopt (int option_, const void *optval_,
size_t optvallen_)
{
if (option_ == ZMQ_SUBSCRIBE) {
std::string subscription ((const char*) optval_, optvallen_);
subscriptions.insert (subscription);
return 0;
}
if (option_ == ZMQ_UNSUBSCRIBE) {
std::string subscription ((const char*) optval_, optvallen_);
subscriptions_t::iterator it = subscriptions.find (subscription);
if (it == subscriptions.end ()) {
errno = EINVAL;
return -1;
}
subscriptions.erase (it);
return 0;
}
return socket_base_t::setsockopt (option_, optval_, optvallen_);
}
int zmq::sub_t::recv (struct zmq_msg_t *msg_, int flags_)
{
while (true) {
// Get a message.
int rc = socket_base_t::recv (msg_, flags_);
// If there's no message available, return immediately.
if (rc != 0 && errno == EAGAIN)
return -1;
// Check the message format.
// TODO: We should either ignore the message or drop the connection
// if the message doesn't conform with the expected format.
unsigned char *data = (unsigned char*) zmq_msg_data (msg_);
zmq_assert (*data <= zmq_msg_size (msg_) - 1);
// Check whether the message matches at least one subscription.
std::string topic ((const char*) (data + 1), *data);
subscriptions_t::iterator it = subscriptions.find (topic);
if (it != subscriptions.end ())
break;
}
return 0;
}
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