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/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other 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_) :
socket_base_t (parent_, tid_)
{
options.type = ZMQ_XPUB;
}
zmq::xpub_t::~xpub_t ()
{
}
void zmq::xpub_t::xattach_pipe (pipe_t *pipe_, const blob_t &peer_identity_)
{
zmq_assert (pipe_);
dist.attach (pipe_);
fq.attach (pipe_);
}
void zmq::xpub_t::xread_activated (pipe_t *pipe_)
{
fq.activated (pipe_);
}
void zmq::xpub_t::xwrite_activated (pipe_t *pipe_)
{
dist.activated (pipe_);
}
void zmq::xpub_t::xterminated (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.terminated (pipe_);
fq.terminated (pipe_);
}
int zmq::xpub_t::xsend (msg_t *msg_, int flags_)
{
// First, process any (un)subscriptions from downstream.
msg_t sub;
sub.init ();
while (true) {
// Grab next subscription.
pipe_t *pipe;
int rc = fq.recvpipe (&sub, 0, &pipe);
if (rc != 0 && errno == EAGAIN)
break;
errno_assert (rc == 0);
// Apply the subscription to the trie. If it's not a duplicate,
// store it so that it can be passed to used on next recv call.
if (apply_subscription (&sub, pipe) && options.type != ZMQ_PUB)
pending.push_back (blob_t ((unsigned char*) sub.data (),
sub.size ()));
}
sub.close ();
return dist.send (msg_, flags_);
}
bool zmq::xpub_t::xhas_out ()
{
return dist.has_out ();
}
int zmq::xpub_t::xrecv (msg_t *msg_, int flags_)
{
// If there is at least one
if (!pending.empty ()) {
int rc = msg_->close ();
errno_assert (rc == 0);
rc = msg_->init_size (pending.front ().size ());
errno_assert (rc == 0);
memcpy (msg_->data (), pending.front ().data (),
pending.front ().size ());
pending.pop_front ();
return 0;
}
// Grab and apply next subscription.
pipe_t *pipe;
int rc = fq.recvpipe (msg_, 0, &pipe);
if (rc != 0)
return -1;
if (!apply_subscription (msg_, pipe)) {
// TODO: This should be a loop rather!
msg_->close ();
msg_->init ();
errno = EAGAIN;
return -1;
}
return 0;
}
bool zmq::xpub_t::xhas_in ()
{
if (!pending.empty ())
return true;
// Even if there are subscriptions in the fair-queuer they may be
// duplicates. Thus, we have to check by hand wheter there is any
// subscription available to pass upstream.
// First, process any (un)subscriptions from downstream.
msg_t sub;
sub.init ();
while (true) {
// Grab next subscription.
pipe_t *pipe;
int rc = fq.recvpipe (&sub, 0, &pipe);
if (rc != 0 && errno == EAGAIN) {
sub.close ();
return false;
}
errno_assert (rc == 0);
// Apply the subscription to the trie. If it's not a duplicate store
// it so that it can be passed to used on next recv call.
if (apply_subscription (&sub, pipe) && options.type != ZMQ_PUB) {
pending.push_back (blob_t ((unsigned char*) sub.data (),
sub.size ()));
sub.close ();
return true;
}
}
}
bool zmq::xpub_t::apply_subscription (msg_t *sub_, pipe_t *pipe_)
{
unsigned char *data = (unsigned char*) sub_->data ();
size_t size = sub_->size ();
zmq_assert (size > 0 && (*data == 0 || *data == 1));
if (*data == 0)
return subscriptions.rm (data + 1, size - 1, pipe_);
else
return subscriptions.add (data + 1, size - 1, pipe_);
}
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.
xpub_t *self = (xpub_t*) arg_;
blob_t unsub (size_ + 1, 0);
unsub [0] = 0;
memcpy (&unsub [1], data_, size_);
self->pending.push_back (unsub);
}
}
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