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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 "req.hpp"
#include "err.hpp"
#include "msg.hpp"
#include "wire.hpp"
#include "random.hpp"
#include "likely.hpp"
zmq::req_t::req_t (class ctx_t *parent_, uint32_t tid_) :
xreq_t (parent_, tid_),
receiving_reply (false),
message_begins (true),
request_id (generate_random ())
{
options.type = ZMQ_REQ;
}
zmq::req_t::~req_t ()
{
}
int zmq::req_t::xsend (msg_t *msg_, int flags_)
{
// If we've sent a request and we still haven't got the reply,
// we can't send another request.
if (receiving_reply) {
errno = EFSM;
return -1;
}
// First part of the request is the request identity.
if (message_begins) {
msg_t prefix;
int rc = prefix.init_size (4);
errno_assert (rc == 0);
prefix.set_flags (msg_t::label);
unsigned char *data = (unsigned char*) prefix.data ();
put_uint32 (data, request_id);
rc = xreq_t::xsend (&prefix, flags_);
if (rc != 0)
return rc;
message_begins = false;
}
bool more = msg_->flags () & (msg_t::more | msg_t::label) ? true : false;
int rc = xreq_t::xsend (msg_, flags_);
if (rc != 0)
return rc;
// If the request was fully sent, flip the FSM into reply-receiving state.
if (!more) {
receiving_reply = true;
message_begins = true;
}
return 0;
}
int zmq::req_t::xrecv (msg_t *msg_, int flags_)
{
// If request wasn't send, we can't wait for reply.
if (!receiving_reply) {
errno = EFSM;
return -1;
}
// First part of the reply should be the original request ID.
if (message_begins) {
int rc = xreq_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
zmq_assert (msg_->flags () & msg_t::label);
zmq_assert (msg_->size () == 4);
unsigned char *data = (unsigned char*) msg_->data ();
if (unlikely (get_uint32 (data) != request_id)) {
// The request ID does not match. Drop the entire message.
while (true) {
int rc = xreq_t::xrecv (msg_, flags_);
errno_assert (rc == 0);
if (!(msg_->flags () & (msg_t::label | msg_t::more)))
break;
}
msg_->close ();
msg_->init ();
errno = EAGAIN;
return -1;
}
message_begins = false;
}
int rc = xreq_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
// If the reply is fully received, flip the FSM into request-sending state.
if (!(msg_->flags () & (msg_t::more | msg_t::label))) {
request_id++;
receiving_reply = false;
message_begins = true;
}
return 0;
}
bool zmq::req_t::xhas_in ()
{
// TODO: Duplicates should be removed here.
if (!receiving_reply)
return false;
return xreq_t::xhas_in ();
}
bool zmq::req_t::xhas_out ()
{
if (receiving_reply)
return false;
return xreq_t::xhas_out ();
}
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