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128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
/*
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Copyright (c) 2007-2009 FastMQ Inc.
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the Lesser GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Lesser GNU General Public License for more details.
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You should have received a copy of the Lesser GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../c/zmq.h"
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#include "sub.hpp"
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#include "err.hpp"
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zmq::sub_t::sub_t (class app_thread_t *parent_) :
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socket_base_t (parent_),
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all_count (0)
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{
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}
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zmq::sub_t::~sub_t ()
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{
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}
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int zmq::sub_t::setsockopt (int option_, const void *optval_,
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size_t optvallen_)
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{
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if (option_ == ZMQ_SUBSCRIBE) {
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std::string subscription ((const char*) optval_, optvallen_);
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if (subscription == "*")
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all_count++;
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else if (subscription [subscription.size () - 1] == '*')
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prefixes.insert (subscription.substr (0, subscription.size () - 1));
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else
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topics.insert (subscription);
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return 0;
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}
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if (option_ == ZMQ_UNSUBSCRIBE) {
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std::string subscription ((const char*) optval_, optvallen_);
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if (subscription == "*") {
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if (!all_count) {
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errno = EINVAL;
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return -1;
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}
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all_count--;
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}
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else if (subscription [subscription.size () - 1] == '*') {
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subscriptions_t::iterator it = prefixes.find (
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subscription.substr (0, subscription.size () - 1));
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if (it == prefixes.end ()) {
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errno = EINVAL;
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return -1;
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}
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prefixes.erase (it);
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}
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else {
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subscriptions_t::iterator it = topics.find (subscription);
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if (it == topics.end ()) {
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errno = EINVAL;
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return -1;
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}
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topics.erase (it);
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}
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return 0;
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}
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return socket_base_t::setsockopt (option_, optval_, optvallen_);
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}
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int zmq::sub_t::send (struct zmq_msg_t *msg_, int flags_)
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{
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errno = EFAULT;
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return -1;
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}
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int zmq::sub_t::flush ()
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{
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errno = EFAULT;
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return -1;
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}
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int zmq::sub_t::recv (struct zmq_msg_t *msg_, int flags_)
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{
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while (true) {
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// Get a message.
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int rc = socket_base_t::recv (msg_, flags_);
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// If there's no message available, return immediately.
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if (rc != 0 && errno == EAGAIN)
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return -1;
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// If there is at least one "*" subscription, the message matches.
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if (all_count)
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return 0;
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// Check the message format.
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// TODO: We should either ignore the message or drop the connection
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// if the message doesn't conform with the expected format.
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unsigned char *data = (unsigned char*) zmq_msg_data (msg_);
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zmq_assert (*data <= zmq_msg_size (msg_) - 1);
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std::string topic ((const char*) (data + 1), *data);
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// Check whether the message matches at least one prefix subscription.
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for (subscriptions_t::iterator it = prefixes.begin ();
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it != prefixes.end (); it++)
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if (it->size () <= topic.size () &&
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*it == topic.substr (0, it->size ()))
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return 0;
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// Check whether the message matches an exact match subscription.
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subscriptions_t::iterator it = topics.find (topic);
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if (it != topics.end ())
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return 0;
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}
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}
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