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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 "xsub.hpp"
#include "err.hpp"
#include "wire.hpp"
xs::xsub_t::xsub_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
socket_base_t (parent_, tid_, sid_)
{
options.type = XS_XSUB;
// When socket is being closed down we don't want to wait till pending
// subscription commands are sent to the wire.
options.linger = 0;
// Also, we want the subscription buffer to be elastic by default.
options.sndhwm = 0;
}
xs::xsub_t::~xsub_t ()
{
}
void xs::xsub_t::xattach_pipe (pipe_t *pipe_, bool icanhasall_)
{
xs_assert (pipe_);
fq.attach (pipe_);
// Pipes with 0MQ/2.1-style protocol are not eligible for accepting
// subscriptions.
if (pipe_->get_protocol () == 1)
return;
dist.attach (pipe_);
// Send all the cached subscriptions to the new upstream peer.
for (subscriptions_t::iterator its = subscriptions.begin ();
its != subscriptions.end (); ++its)
send_subscription (pipe_, true, its->first.first,
its->first.second.data (), its->first.second.size ());
pipe_->flush ();
}
void xs::xsub_t::xread_activated (pipe_t *pipe_)
{
fq.activated (pipe_);
}
void xs::xsub_t::xwrite_activated (pipe_t *pipe_)
{
dist.activated (pipe_);
}
void xs::xsub_t::xterminated (pipe_t *pipe_)
{
fq.terminated (pipe_);
if (pipe_->get_protocol () != 1)
dist.terminated (pipe_);
}
void xs::xsub_t::xhiccuped (pipe_t *pipe_)
{
// In 0MQ/2.1 protocol there is no subscription forwarding.
if (pipe_->get_protocol () == 1)
return;
// Send all the cached subscriptions to the new upstream peer.
for (subscriptions_t::iterator its = subscriptions.begin ();
its != subscriptions.end (); ++its)
send_subscription (pipe_, true, its->first.first,
its->first.second.data (), its->first.second.size ());
pipe_->flush ();
}
int xs::xsub_t::xsend (msg_t *msg_, int flags_)
{
size_t size = msg_->size ();
unsigned char *data = (unsigned char*) msg_->data ();
if (size < 4) {
errno = EINVAL;
return -1;
}
int cmd = get_uint16 (data);
int filter_id = get_uint16 (data + 2);
if (cmd != XS_CMD_SUBSCRIBE && cmd != XS_CMD_UNSUBSCRIBE) {
errno = EINVAL;
return -1;
}
// Process the subscription.
if (cmd == XS_CMD_SUBSCRIBE) {
subscriptions_t::iterator it = subscriptions.insert (
std::make_pair (std::make_pair (filter_id,
blob_t (data + 4, size - 4)), 0)).first;
++it->second;
if (it->second == 1)
return dist.send_to_all (msg_, flags_);
}
else if (cmd == XS_CMD_UNSUBSCRIBE) {
subscriptions_t::iterator it = subscriptions.find (
std::make_pair (filter_id, blob_t (data + 4, size - 4)));
if (it != subscriptions.end ()) {
xs_assert (it->second);
--it->second;
if (!it->second) {
subscriptions.erase (it);
return dist.send_to_all (msg_, flags_);
}
}
}
int rc = msg_->close ();
errno_assert (rc == 0);
rc = msg_->init ();
errno_assert (rc == 0);
return 0;
}
bool xs::xsub_t::xhas_out ()
{
// Subscription can be added/removed anytime.
return true;
}
int xs::xsub_t::xrecv (msg_t *msg_, int flags_)
{
return fq.recv (msg_, flags_);
}
bool xs::xsub_t::xhas_in ()
{
return fq.has_in ();
}
void xs::xsub_t::send_subscription (pipe_t *pipe_, bool subscribe_,
int filter_id_, const unsigned char *data_, size_t size_)
{
// Create the subsctription message.
msg_t msg;
int rc = msg.init_size (size_ + 4);
xs_assert (rc == 0);
unsigned char *data = (unsigned char*) msg.data ();
put_uint16 (data, subscribe_ ? XS_CMD_SUBSCRIBE : XS_CMD_UNSUBSCRIBE);
put_uint16 (data + 2, filter_id_);
memcpy (data + 4, data_, size_);
// Send it to the pipe.
bool sent = pipe_->write (&msg);
// If we reached the SNDHWM, and thus cannot send the subscription, drop
// the subscription message instead. This matches the behaviour of
// xs_setsockopt(XS_SUBSCRIBE, ...), which also drops subscriptions
// when the SNDHWM is reached.
if (!sent)
msg.close ();
}
xs::xsub_session_t::xsub_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::xsub_session_t::~xsub_session_t ()
{
}
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