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/*
Copyright (c) 2010-2012 250bpm s.r.o.
Copyright (c) 2011 VMware, Inc.
Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O 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.
Crossroads 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"
xs::xpub_t::xpub_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
socket_base_t (parent_, tid_, sid_),
more (false)
{
options.type = XS_XPUB;
}
xs::xpub_t::~xpub_t ()
{
}
void xs::xpub_t::xattach_pipe (pipe_t *pipe_, bool icanhasall_)
{
xs_assert (pipe_);
dist.attach (pipe_);
// If icanhasall_ is specified, the caller would like to subscribe
// to all data on this pipe, implicitly.
if (icanhasall_)
subscriptions.add (NULL, 0, pipe_);
// The pipe is active when attached. Let's read the subscriptions from
// it, if any.
xread_activated (pipe_);
}
void xs::xpub_t::xread_activated (pipe_t *pipe_)
{
// There are some subscriptions waiting. Let's process them.
msg_t sub;
sub.init ();
while (true) {
// Grab next subscription.
if (!pipe_->read (&sub)) {
sub.close ();
return;
}
// Apply the subscription to the trie.
unsigned char *data = (unsigned char*) sub.data ();
size_t size = sub.size ();
// TODO: In the case of malformed subscription we will simply ignore
// it for now. However, we should close the connection instead.
if (size <= 0 || (*data == 0 && *data == 1)) {
sub.close ();
return;
}
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.
if (unique && options.type != XS_PUB)
pending.push_back (blob_t ((unsigned char*) sub.data (),
sub.size ()));
}
sub.close ();
}
void xs::xpub_t::xwrite_activated (pipe_t *pipe_)
{
dist.activated (pipe_);
}
void xs::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_);
}
void xs::xpub_t::mark_as_matching (pipe_t *pipe_, void *arg_)
{
xpub_t *self = (xpub_t*) arg_;
self->dist.match (pipe_);
}
int xs::xpub_t::xsend (msg_t *msg_, int flags_)
{
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_, flags_);
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 xs::xpub_t::xhas_out ()
{
return dist.has_out ();
}
int xs::xpub_t::xrecv (msg_t *msg_, int flags_)
{
// If there is at least one
if (pending.empty ()) {
errno = EAGAIN;
return -1;
}
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;
}
bool xs::xpub_t::xhas_in ()
{
return !pending.empty ();
}
void xs::xpub_t::send_unsubscription (unsigned char *data_, size_t size_,
void *arg_)
{
xpub_t *self = (xpub_t*) arg_;
if (self->options.type != XS_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 ((void*) (unsub.data () + 1), data_, size_);
self->pending.push_back (unsub);
}
}
xs::xpub_session_t::xpub_session_t (io_thread_t *io_thread_, bool connect_,
socket_base_t *socket_, const options_t &options_,
const char *protocol_, const char *address_) :
session_base_t (io_thread_, connect_, socket_, options_, protocol_,
address_)
{
}
xs::xpub_session_t::~xpub_session_t ()
{
}
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