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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
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 <string.h>
#include "xpub.hpp"
#include "pipe.hpp"
#include "err.hpp"
#include "msg.hpp"
zmq::xpub_t::xpub_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
socket_base_t (parent_, tid_, sid_),
verbose(false),
more (false)
{
options.type = ZMQ_XPUB;
}
zmq::xpub_t::~xpub_t ()
{
}
void zmq::xpub_t::xattach_pipe (pipe_t *pipe_, bool subscribe_to_all_)
{
zmq_assert (pipe_);
dist.attach (pipe_);
// If subscribe_to_all_ is specified, the caller would like to subscribe
// to all data on this pipe, implicitly.
if (subscribe_to_all_)
subscriptions.add (NULL, 0, pipe_);
// The pipe is active when attached. Let's read the subscriptions from
// it, if any.
xread_activated (pipe_);
}
void zmq::xpub_t::xread_activated (pipe_t *pipe_)
{
// There are some subscriptions waiting. Let's process them.
msg_t sub;
while (pipe_->read (&sub)) {
// Apply the subscription to the trie
unsigned char *const data = (unsigned char *) sub.data ();
const size_t size = sub.size ();
if (size > 0 && (*data == 0 || *data == 1)) {
bool unique;
if (*data == 0)
unique = subscriptions.rm (data + 1, size - 1, pipe_);
else
unique = subscriptions.add (data + 1, size - 1, pipe_);
// If the subscription is not a duplicate store it so that it can be
// passed to used on next recv call. (Unsubscribe is not verbose.)
if (options.type == ZMQ_XPUB && (unique || (*data && verbose))) {
pending_data.push_back (blob_t (data, size));
pending_flags.push_back (0);
}
}
else {
// Process user message coming upstream from xsub socket
pending_data.push_back (blob_t (data, size));
pending_flags.push_back (sub.flags ());
}
sub.close ();
}
}
void zmq::xpub_t::xwrite_activated (pipe_t *pipe_)
{
dist.activated (pipe_);
}
int zmq::xpub_t::xsetsockopt (int option_, const void *optval_,
size_t optvallen_)
{
if (option_ != ZMQ_XPUB_VERBOSE) {
errno = EINVAL;
return -1;
}
if (optvallen_ != sizeof (int) || *static_cast <const int*> (optval_) < 0) {
errno = EINVAL;
return -1;
}
verbose = (*static_cast <const int*> (optval_) != 0);
return 0;
}
void zmq::xpub_t::xpipe_terminated (pipe_t *pipe_)
{
// Remove the pipe from the trie. If there are topics that nobody
// is interested in anymore, send corresponding unsubscriptions
// upstream.
subscriptions.rm (pipe_, send_unsubscription, this);
dist.pipe_terminated (pipe_);
}
void zmq::xpub_t::mark_as_matching (pipe_t *pipe_, void *arg_)
{
xpub_t *self = (xpub_t*) arg_;
self->dist.match (pipe_);
}
int zmq::xpub_t::xsend (msg_t *msg_)
{
bool msg_more = msg_->flags () & msg_t::more ? true : false;
// For the first part of multi-part message, find the matching pipes.
if (!more)
subscriptions.match ((unsigned char*) msg_->data (), msg_->size (),
mark_as_matching, this);
// Send the message to all the pipes that were marked as matching
// in the previous step.
int rc = dist.send_to_matching (msg_);
if (rc != 0)
return rc;
// If we are at the end of multi-part message we can mark all the pipes
// as non-matching.
if (!msg_more)
dist.unmatch ();
more = msg_more;
return 0;
}
bool zmq::xpub_t::xhas_out ()
{
return dist.has_out ();
}
int zmq::xpub_t::xrecv (msg_t *msg_)
{
// If there is at least one
if (pending_data.empty ()) {
errno = EAGAIN;
return -1;
}
int rc = msg_->close ();
errno_assert (rc == 0);
rc = msg_->init_size (pending_data.front ().size ());
errno_assert (rc == 0);
memcpy (msg_->data (),
pending_data.front ().data (),
pending_data.front ().size ());
msg_->set_flags (pending_flags.front ());
pending_data.pop_front ();
pending_flags.pop_front ();
return 0;
}
bool zmq::xpub_t::xhas_in ()
{
return !pending_data.empty ();
}
void zmq::xpub_t::send_unsubscription (unsigned char *data_, size_t size_,
void *arg_)
{
xpub_t *self = (xpub_t*) arg_;
if (self->options.type != ZMQ_PUB) {
// Place the unsubscription to the queue of pending (un)sunscriptions
// to be retrived by the user later on.
blob_t unsub (size_ + 1, 0);
unsub [0] = 0;
memcpy (&unsub [1], data_, size_);
self->pending_data.push_back (unsub);
self->pending_flags.push_back (0);
}
}
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