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/*
Copyright (c) 2009-2012 250bpm s.r.o.
Copyright (c) 2007-2009 iMatix Corporation
Copyright (c) 2011 VMware, Inc.
Copyright (c) 2007-2011 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 "req.hpp"
#include "err.hpp"
#include "msg.hpp"
#include "wire.hpp"
#include "random.hpp"
#include "likely.hpp"
xs::req_t::req_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
xreq_t (parent_, tid_, sid_),
receiving_reply (false),
message_begins (true)
{
options.type = XS_REQ;
}
xs::req_t::~req_t ()
{
}
int xs::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 bottom;
int rc = bottom.init ();
errno_assert (rc == 0);
bottom.set_flags (msg_t::more);
rc = xreq_t::xsend (&bottom, 0);
if (rc != 0) {
bottom.close ();
return -1;
}
message_begins = false;
bottom.close ();
}
bool more = msg_->flags () & msg_t::more ? 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 xs::req_t::xrecv (msg_t *msg_, int flags_)
{
int rc;
// 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) {
rc = xreq_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
// TODO: This should also close the connection with the peer!
if (unlikely (!(msg_->flags () & msg_t::more) || msg_->size () != 0)) {
while (true) {
rc = xreq_t::xrecv (msg_, flags_);
errno_assert (rc == 0);
if (!(msg_->flags () & msg_t::more))
break;
}
msg_->close ();
msg_->init ();
errno = EAGAIN;
return -1;
}
message_begins = false;
}
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)) {
receiving_reply = false;
message_begins = true;
}
return 0;
}
bool xs::req_t::xhas_in ()
{
// TODO: Duplicates should be removed here.
if (!receiving_reply)
return false;
return xreq_t::xhas_in ();
}
bool xs::req_t::xhas_out ()
{
if (receiving_reply)
return false;
return xreq_t::xhas_out ();
}
xs::req_session_t::req_session_t (io_thread_t *io_thread_, bool connect_,
socket_base_t *socket_, const options_t &options_,
const char *protocol_, const char *address_) :
xreq_session_t (io_thread_, connect_, socket_, options_, protocol_,
address_),
state (identity)
{
}
xs::req_session_t::~req_session_t ()
{
state = options.recv_identity ? identity : bottom;
}
int xs::req_session_t::write (msg_t *msg_)
{
switch (state) {
case bottom:
if (msg_->flags () == msg_t::more && msg_->size () == 0) {
state = body;
return xreq_session_t::write (msg_);
}
break;
case body:
if (msg_->flags () == msg_t::more)
return xreq_session_t::write (msg_);
if (msg_->flags () == 0) {
state = bottom;
return xreq_session_t::write (msg_);
}
break;
case identity:
if (msg_->flags () == 0) {
state = bottom;
return xreq_session_t::write (msg_);
}
break;
}
errno = EFAULT;
return -1;
}
void xs::req_session_t::detach ()
{
state = options.recv_identity ? identity : bottom;
xreq_session_t::detach ();
}
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