Imported Upstream version 2.0.7.dfsgupstream/2.0.7.dfsg

1 files changed, 286 insertions, 0 deletions

diff --git a/src/req.cpp b/src/req.cpp
new file mode 100644
index 0000000..f3695a2
--- /dev/null
+++ b/src/req.cpp
@@ -0,0 +1,286 @@
+/*
+    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;
+}
+
+