initial version of req/rep sockets

1 files changed, 204 insertions, 0 deletions

diff --git a/src/rep.cpp b/src/rep.cpp
new file mode 100644
index 0000000..2fbb66c
--- /dev/null
+++ b/src/rep.cpp
@@ -0,0 +1,204 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    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 "../bindings/c/zmq.h"
+
+#include "rep.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::rep_t::rep_t (class app_thread_t *parent_) :
+    socket_base_t (parent_, ZMQ_REP),
+    active (0),
+    current (0),
+    waiting_for_reply (false),
+    reply_pipe (NULL)
+{
+}
+
+zmq::rep_t::~rep_t ()
+{
+}
+
+bool zmq::rep_t::xrequires_in ()
+{
+    return true;
+}
+
+bool zmq::rep_t::xrequires_out ()
+{
+    return true;
+}
+
+void zmq::rep_t::xattach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_)
+{
+    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::rep_t::xdetach_inpipe (class reader_t *pipe_)
+{
+    zmq_assert (pipe_);
+    zmq_assert (in_pipes.size () == out_pipes.size ());
+
+    in_pipes_t::size_type index = in_pipes.index (pipe_);
+
+    //  If corresponding outpipe is still in place simply nullify the pointer
+    //  to the inpipe and move it to the passive state.
+    if (out_pipes [index]) {
+        in_pipes [index] = NULL;
+        if (in_pipes.index (pipe_) < active) {
+            active--;
+            in_pipes.swap (index, active);
+            out_pipes.swap (index, active);
+        }
+        return;
+    }
+
+    //  Now both inpipe and outpipe are detached. Remove them from the lists.
+    if (in_pipes.index (pipe_) < active)
+        active--;
+    in_pipes.erase (index);
+    out_pipes.erase (index);
+}
+
+void zmq::rep_t::xdetach_outpipe (class writer_t *pipe_)
+{
+    zmq_assert (pipe_);
+    zmq_assert (in_pipes.size () == out_pipes.size ());
+
+    out_pipes_t::size_type index = out_pipes.index (pipe_);
+
+    //  TODO: If the connection we've got the request from disconnects,
+    //  there's nowhere to send the reply. DLQ?
+    if (waiting_for_reply && pipe_ == reply_pipe) {
+        zmq_assert (false);
+    }
+
+    //  If corresponding inpipe is still in place simply nullify the pointer
+    //  to the outpipe.
+    if (in_pipes [index]) {
+        out_pipes [index] = NULL;
+        if (out_pipes.index (pipe_) < active) {
+            active--;
+            in_pipes.swap (index, active);
+            out_pipes.swap (index, active);
+        }
+        return;
+    }
+
+    //  Now both inpipe and outpipe are detached. Remove them from the lists.
+    if (out_pipes.index (pipe_) < active)
+        active--;
+    in_pipes.erase (index);
+    out_pipes.erase (index);
+}
+
+void zmq::rep_t::xkill (class reader_t *pipe_)
+{
+    //  Move the pipe to the list of inactive pipes.
+    in_pipes_t::size_type index = in_pipes.index (pipe_);
+    active--;
+    in_pipes.swap (index, active);
+    out_pipes.swap (index, active);
+}
+
+void zmq::rep_t::xrevive (class reader_t *pipe_)
+{
+    //  Move the pipe to the list of active pipes.
+    in_pipes_t::size_type index = in_pipes.index (pipe_);
+    in_pipes.swap (index, active);
+    out_pipes.swap (index, active);
+    active++;
+}
+
+int zmq::rep_t::xsetsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    errno = EINVAL;
+    return -1;
+}
+
+int zmq::rep_t::xsend (struct zmq_msg_t *msg_, int flags_)
+{
+    if (!waiting_for_reply) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    //  TODO: Implement this once queue limits are in-place. If the reply
+    //  overloads the buffer, connection should be torn down.
+    zmq_assert (reply_pipe->check_write (zmq_msg_size (msg_)));
+
+    //  Push message to the selected pipe.
+    reply_pipe->write (msg_);
+    reply_pipe->flush ();
+
+    waiting_for_reply = false;
+    reply_pipe = NULL;
+
+    //  Detach the message from the data buffer.
+    int rc = zmq_msg_init (msg_);
+    zmq_assert (rc == 0);
+}
+
+int zmq::rep_t::xflush ()
+{
+    errno = EFAULT;
+    return -1;
+}
+
+int zmq::rep_t::xrecv (struct zmq_msg_t *msg_, int flags_)
+{
+    //  Deallocate old content of the message.
+    zmq_msg_close (msg_);
+
+    if (waiting_for_reply) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    //  Round-robin over the pipes to get next message.
+    for (int count = active; count != 0; count--) {
+        bool fetched = in_pipes [current]->read (msg_);
+        current++;
+        if (current >= active)
+            current = 0;
+        if (fetched) {
+            reply_pipe = out_pipes [current];
+            waiting_for_reply = true;
+            return 0;
+        }
+    }
+
+    //  No message is available. Initialise the output parameter
+    //  to be a 0-byte message.
+    zmq_msg_init (msg_);
+    errno = EAGAIN;
+    return -1;
+}
+
+