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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 "../include/zmq.h"
#include "rep.hpp"
#include "err.hpp"
zmq::rep_t::rep_t (class ctx_t *parent_, uint32_t tid_) :
xrep_t (parent_, tid_),
sending_reply (false),
request_begins (true)
{
options.type = ZMQ_REP;
}
zmq::rep_t::~rep_t ()
{
}
int zmq::rep_t::xsend (zmq_msg_t *msg_, int flags_)
{
// If we are in the middle of receiving a request, we cannot send reply.
if (!sending_reply) {
errno = EFSM;
return -1;
}
bool more = (msg_->flags & ZMQ_MSG_MORE);
// Push message to the reply pipe.
int rc = xrep_t::xsend (msg_, flags_);
if (rc != 0)
return rc;
// If the reply is complete flip the FSM back to request receiving state.
if (!more)
sending_reply = false;
return 0;
}
int zmq::rep_t::xrecv (zmq_msg_t *msg_, int flags_)
{
// If we are in middle of sending a reply, we cannot receive next request.
if (sending_reply) {
errno = EFSM;
return -1;
}
if (request_begins) {
// Copy the backtrace stack to the reply pipe.
bool bottom = false;
while (!bottom) {
// TODO: What if request can be read but reply pipe is not
// ready for writing?
// Get next part of the backtrace stack.
int rc = xrep_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
if ((msg_->flags & ZMQ_MSG_MORE)) {
// Empty message part delimits the traceback stack.
bottom = (zmq_msg_size (msg_) == 0);
// Push it to the reply pipe.
rc = xrep_t::xsend (msg_, flags_);
errno_assert (rc == 0);
}
else {
// If the traceback stack is malformed, discard anything
// already sent to pipe (we're at end of invalid message).
rc = xrep_t::rollback ();
zmq_assert (rc == 0);
}
}
request_begins = false;
}
// Now the routing info is safely stored. Get the first part
// of the message payload and exit.
int rc = xrep_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
// If whole request is read, flip the FSM to reply-sending state.
if (!(msg_->flags & ZMQ_MSG_MORE)) {
sending_reply = true;
request_begins = true;
}
return 0;
}
bool zmq::rep_t::xhas_in ()
{
if (sending_reply)
return false;
return xrep_t::xhas_in ();
}
bool zmq::rep_t::xhas_out ()
{
if (!sending_reply)
return false;
return xrep_t::xhas_out ();
}
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