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/*
Copyright (c) 2007-2015 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 <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),
lossy (true)
{
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 (optvallen_ != sizeof (int) || *static_cast <const int*> (optval_) < 0) {
errno = EINVAL;
return -1;
}
if (option_ == ZMQ_XPUB_VERBOSE)
verbose = (*static_cast <const int*> (optval_) != 0);
else
if (option_ == ZMQ_XPUB_NODROP)
lossy = (*static_cast <const int*> (optval_) == 0);
else {
errno = EINVAL;
return -1;
}
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);
int rc = -1; // Assume we fail
if (lossy || dist.check_hwm ()) {
if (dist.send_to_matching (msg_) == 0) {
// 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;
rc = 0; // Yay, sent successfully
}
}
else
errno = EAGAIN;
return rc;
}
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;
if (size_ > 0)
memcpy (&unsub [1], data_, size_);
self->pending_data.push_back (unsub);
self->pending_flags.push_back (0);
}
}
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