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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 "../bindings/c/zmq.h"
#include "sub.hpp"
#include "err.hpp"
#include "pipe.hpp"
zmq::sub_t::sub_t (class app_thread_t *parent_) :
socket_base_t (parent_),
active (0),
current (0),
all_count (0)
{
options.requires_in = true;
options.requires_out = false;
}
zmq::sub_t::~sub_t ()
{
for (in_pipes_t::size_type i = 0; i != in_pipes.size (); i++)
in_pipes [i]->term ();
in_pipes.clear ();
}
void zmq::sub_t::xattach_pipes (class reader_t *inpipe_,
class writer_t *outpipe_)
{
zmq_assert (!outpipe_);
in_pipes.push_back (inpipe_);
in_pipes.swap (active, in_pipes.size () - 1);
active++;
}
void zmq::sub_t::xdetach_inpipe (class reader_t *pipe_)
{
if (in_pipes.index (pipe_) < active)
active--;
in_pipes.erase (pipe_);
}
void zmq::sub_t::xdetach_outpipe (class writer_t *pipe_)
{
zmq_assert (false);
}
void zmq::sub_t::xkill (class reader_t *pipe_)
{
// Move the pipe to the list of inactive pipes.
in_pipes.swap (in_pipes.index (pipe_), active - 1);
active--;
}
void zmq::sub_t::xrevive (class reader_t *pipe_)
{
// Move the pipe to the list of active pipes.
in_pipes.swap (in_pipes.index (pipe_), active);
active++;
}
int zmq::sub_t::xsetsockopt (int option_, const void *optval_,
size_t optvallen_)
{
if (option_ == ZMQ_SUBSCRIBE) {
std::string subscription ((const char*) optval_, optvallen_);
if (subscription == "*")
all_count++;
else if (subscription [subscription.size () - 1] == '*')
prefixes.insert (subscription.substr (0, subscription.size () - 1));
else
topics.insert (subscription);
return 0;
}
if (option_ == ZMQ_UNSUBSCRIBE) {
std::string subscription ((const char*) optval_, optvallen_);
if (subscription == "*") {
if (!all_count) {
errno = EINVAL;
return -1;
}
all_count--;
}
else if (subscription [subscription.size () - 1] == '*') {
subscriptions_t::iterator it = prefixes.find (
subscription.substr (0, subscription.size () - 1));
if (it == prefixes.end ()) {
errno = EINVAL;
return -1;
}
prefixes.erase (it);
}
else {
subscriptions_t::iterator it = topics.find (subscription);
if (it == topics.end ()) {
errno = EINVAL;
return -1;
}
topics.erase (it);
}
return 0;
}
errno = EINVAL;
return -1;
}
int zmq::sub_t::xsend (struct zmq_msg_t *msg_, int flags_)
{
errno = ENOTSUP;
return -1;
}
int zmq::sub_t::xflush ()
{
errno = ENOTSUP;
return -1;
}
int zmq::sub_t::xrecv (struct zmq_msg_t *msg_, int flags_)
{
while (true) {
// Get a message using fair queueing algorithm.
int rc = fq (msg_, flags_);
// If there's no message available, return immediately.
if (rc != 0 && errno == EAGAIN)
return -1;
// If there is no subscription return -1/EAGAIN.
if (!all_count && prefixes.empty () && topics.empty ()) {
errno = EAGAIN;
return -1;
}
// If there is at least one "*" subscription, the message matches.
if (all_count)
return 0;
// 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);
std::string topic ((const char*) (data + 1), *data);
// Check whether the message matches at least one prefix subscription.
for (subscriptions_t::iterator it = prefixes.begin ();
it != prefixes.end (); it++)
if (it->size () <= topic.size () &&
*it == topic.substr (0, it->size ()))
return 0;
// Check whether the message matches an exact match subscription.
subscriptions_t::iterator it = topics.find (topic);
if (it != topics.end ())
return 0;
}
}
int zmq::sub_t::fq (zmq_msg_t *msg_, int flags_)
{
// Deallocate old content of the message.
zmq_msg_close (msg_);
// Round-robin over the pipes to get next message.
for (int count = active; count != 0; count--) {
bool fetched = in_pipes [current]->read (msg_);
current++;
if (current >= active)
current = 0;
if (fetched)
return 0;
}
// No message is available. Initialise the output parameter
// to be a 0-byte message.
zmq_msg_init (msg_);
errno = EAGAIN;
return -1;
}
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