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authorMartin Lucina <martin@lucina.net>2012-01-23 08:53:19 +0100
committerMartin Lucina <martin@lucina.net>2012-01-23 08:53:19 +0100
commita15854bd92db69fcd0b4444fe1b8fe3610a7acf6 (patch)
tree1214b945d0f0033ff318de367c70525ea141ef56 /src/req.cpp
Imported Upstream version 2.0.7.dfsgupstream/2.0.7.dfsg
Diffstat (limited to 'src/req.cpp')
-rw-r--r--src/req.cpp286
1 files changed, 286 insertions, 0 deletions
diff --git a/src/req.cpp b/src/req.cpp
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+++ b/src/req.cpp
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+/*
+ Copyright (c) 2007-2010 iMatix Corporation
+
+ This file is part of 0MQ.
+
+ 0MQ is free software; you can redistribute it and/or modify it under
+ the terms of the Lesser GNU 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
+ Lesser GNU General Public License for more details.
+
+ You should have received a copy of the Lesser GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "../include/zmq.h"
+
+#include "req.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::req_t::req_t (class app_thread_t *parent_) :
+ socket_base_t (parent_),
+ active (0),
+ current (0),
+ receiving_reply (false),
+ reply_pipe_active (false),
+ more (false),
+ reply_pipe (NULL)
+{
+ options.requires_in = true;
+ options.requires_out = true;
+}
+
+zmq::req_t::~req_t ()
+{
+}
+
+void zmq::req_t::xattach_pipes (class reader_t *inpipe_,
+ class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+ zmq_assert (inpipe_ && outpipe_);
+ zmq_assert (in_pipes.size () == out_pipes.size ());
+
+ in_pipes.push_back (inpipe_);
+ in_pipes.swap (active, in_pipes.size () - 1);
+
+ out_pipes.push_back (outpipe_);
+ out_pipes.swap (active, out_pipes.size () - 1);
+
+ active++;
+}
+
+void zmq::req_t::xdetach_inpipe (class reader_t *pipe_)
+{
+ zmq_assert (!receiving_reply || !more || reply_pipe != pipe_);
+
+ zmq_assert (pipe_);
+ zmq_assert (in_pipes.size () == out_pipes.size ());
+
+ // TODO: The pipe we are awaiting the reply from is detached. What now?
+ // Return ECONNRESET from subsequent recv?
+ if (receiving_reply && pipe_ == reply_pipe) {
+ zmq_assert (false);
+ }
+
+ in_pipes_t::size_type index = in_pipes.index (pipe_);
+
+ if (out_pipes [index])
+ out_pipes [index]->term ();
+ in_pipes.erase (index);
+ out_pipes.erase (index);
+ if (index < active) {
+ active--;
+ if (current == active)
+ current = 0;
+ }
+}
+
+void zmq::req_t::xdetach_outpipe (class writer_t *pipe_)
+{
+ zmq_assert (receiving_reply || !more || out_pipes [current] != pipe_);
+
+ zmq_assert (pipe_);
+ zmq_assert (in_pipes.size () == out_pipes.size ());
+
+ out_pipes_t::size_type index = out_pipes.index (pipe_);
+
+ if (in_pipes [index])
+ in_pipes [index]->term ();
+ in_pipes.erase (index);
+ out_pipes.erase (index);
+ if (index < active) {
+ active--;
+ if (current == active)
+ current = 0;
+ }
+}
+
+void zmq::req_t::xkill (class reader_t *pipe_)
+{
+ zmq_assert (receiving_reply);
+ zmq_assert (pipe_ == reply_pipe);
+
+ reply_pipe_active = false;
+}
+
+void zmq::req_t::xrevive (class reader_t *pipe_)
+{
+ // TODO: Actually, misbehaving peer can cause this kind of thing.
+ // Handle it decently, presumably kill the offending connection.
+ zmq_assert (pipe_ == reply_pipe);
+ reply_pipe_active = true;
+}
+
+void zmq::req_t::xrevive (class writer_t *pipe_)
+{
+ out_pipes_t::size_type index = out_pipes.index (pipe_);
+ zmq_assert (index >= active);
+
+ if (in_pipes [index] != NULL) {
+ in_pipes.swap (index, active);
+ out_pipes.swap (index, active);
+ active++;
+ }
+}
+
+int zmq::req_t::xsetsockopt (int option_, const void *optval_,
+ size_t optvallen_)
+{
+ errno = EINVAL;
+ return -1;
+}
+
+int zmq::req_t::xsend (zmq_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;
+ }
+
+ while (active > 0) {
+ if (out_pipes [current]->check_write ())
+ break;
+
+ zmq_assert (!more);
+ active--;
+ if (current < active) {
+ in_pipes.swap (current, active);
+ out_pipes.swap (current, active);
+ }
+ else
+ current = 0;
+ }
+
+ if (active == 0) {
+ errno = EAGAIN;
+ return -1;
+ }
+
+ // If we are starting to send the request, generate a prefix.
+ if (!more) {
+ zmq_msg_t prefix;
+ int rc = zmq_msg_init (&prefix);
+ zmq_assert (rc == 0);
+ prefix.flags |= ZMQ_MSG_MORE;
+ bool written = out_pipes [current]->write (&prefix);
+ zmq_assert (written);
+ }
+
+ // Push the message to the selected pipe.
+ bool written = out_pipes [current]->write (msg_);
+ zmq_assert (written);
+ more = msg_->flags & ZMQ_MSG_MORE;
+ if (!more) {
+ out_pipes [current]->flush ();
+ receiving_reply = true;
+ reply_pipe = in_pipes [current];
+
+ // We can safely assume that the reply pipe is active as the last time
+ // we've used it we've read the reply and haven't tried to read from it
+ // anymore.
+ reply_pipe_active = true;
+
+ // Move to the next pipe (load-balancing).
+ current = (current + 1) % active;
+ }
+
+ // Detach the message from the data buffer.
+ int rc = zmq_msg_init (msg_);
+ zmq_assert (rc == 0);
+
+ return 0;
+}
+
+int zmq::req_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+ // Deallocate old content of the message.
+ int rc = zmq_msg_close (msg_);
+ zmq_assert (rc == 0);
+
+ // If request wasn't send, we can't wait for reply.
+ if (!receiving_reply) {
+ zmq_msg_init (msg_);
+ errno = EFSM;
+ return -1;
+ }
+
+ // Get the reply from the reply pipe.
+ if (!reply_pipe_active || !reply_pipe->read (msg_)) {
+ zmq_msg_init (msg_);
+ errno = EAGAIN;
+ return -1;
+ }
+
+ // If we are starting to receive new reply, check whether prefix
+ // is well-formed and drop it.
+ if (!more) {
+ zmq_assert (msg_->flags & ZMQ_MSG_MORE);
+ zmq_assert (zmq_msg_size (msg_) == 0);
+ rc = zmq_msg_close (msg_);
+ zmq_assert (rc == 0);
+
+ // Get the actual reply.
+ bool recvd = reply_pipe->read (msg_);
+ zmq_assert (recvd);
+ }
+
+ // If this was last part of the reply, switch to request phase.
+ more = msg_->flags & ZMQ_MSG_MORE;
+ if (!more) {
+ receiving_reply = false;
+ reply_pipe = NULL;
+ }
+
+ return 0;
+}
+
+bool zmq::req_t::xhas_in ()
+{
+ if (receiving_reply && more)
+ return true;
+
+ if (!receiving_reply || !reply_pipe_active)
+ return false;
+
+ zmq_assert (reply_pipe);
+ if (!reply_pipe->check_read ()) {
+ reply_pipe_active = false;
+ return false;
+ }
+
+ return true;
+}
+
+bool zmq::req_t::xhas_out ()
+{
+ if (!receiving_reply && more)
+ return true;
+
+ if (receiving_reply)
+ return false;
+
+ while (active > 0) {
+ if (out_pipes [current]->check_write ())
+ return true;;
+
+ active--;
+ if (current < active) {
+ in_pipes.swap (current, active);
+ out_pipes.swap (current, active);
+ }
+ else
+ current = 0;
+ }
+
+ return false;
+}
+
+