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-rw-r--r--src/xrespondent.cpp278
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diff --git a/src/xrespondent.cpp b/src/xrespondent.cpp
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+++ b/src/xrespondent.cpp
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+/*
+ Copyright (c) 2012 250bpm s.r.o.
+ Copyright (c) 2012 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 "xrespondent.hpp"
+#include "pipe.hpp"
+#include "wire.hpp"
+#include "random.hpp"
+#include "likely.hpp"
+#include "err.hpp"
+
+xs::xrespondent_t::xrespondent_t (class ctx_t *parent_, uint32_t tid_,
+ int sid_) :
+ socket_base_t (parent_, tid_, sid_),
+ prefetched (0),
+ more_in (false),
+ current_out (NULL),
+ more_out (false),
+ next_peer_id (generate_random ())
+{
+ options.type = XS_XRESPONDENT;
+
+ prefetched_msg.init ();
+}
+
+xs::xrespondent_t::~xrespondent_t ()
+{
+ xs_assert (outpipes.empty ());
+ prefetched_msg.close ();
+}
+
+void xs::xrespondent_t::xattach_pipe (pipe_t *pipe_, bool icanhasall_)
+{
+ xs_assert (pipe_);
+
+ // Add the pipe to the map out outbound pipes.
+ outpipe_t outpipe = {pipe_, true};
+ bool ok = outpipes.insert (outpipes_t::value_type (
+ next_peer_id, outpipe)).second;
+ xs_assert (ok);
+
+ // Add the pipe to the list of inbound pipes.
+ blob_t identity (4, 0);
+ put_uint32 ((unsigned char*) identity.data (), next_peer_id);
+ pipe_->set_identity (identity);
+ fq.attach (pipe_);
+
+ // Generate a new unique peer identity.
+ ++next_peer_id;
+}
+
+void xs::xrespondent_t::xterminated (pipe_t *pipe_)
+{
+ fq.terminated (pipe_);
+
+ for (outpipes_t::iterator it = outpipes.begin ();
+ it != outpipes.end (); ++it) {
+ if (it->second.pipe == pipe_) {
+ outpipes.erase (it);
+ if (pipe_ == current_out)
+ current_out = NULL;
+ return;
+ }
+ }
+ xs_assert (false);
+}
+
+void xs::xrespondent_t::xread_activated (pipe_t *pipe_)
+{
+ fq.activated (pipe_);
+}
+
+void xs::xrespondent_t::xwrite_activated (pipe_t *pipe_)
+{
+ for (outpipes_t::iterator it = outpipes.begin ();
+ it != outpipes.end (); ++it) {
+ if (it->second.pipe == pipe_) {
+ xs_assert (!it->second.active);
+ it->second.active = true;
+ return;
+ }
+ }
+ xs_assert (false);
+}
+
+int xs::xrespondent_t::xsend (msg_t *msg_, int flags_)
+{
+ // If this is the first part of the message it's the ID of the
+ // peer to send the message to.
+ if (!more_out) {
+ xs_assert (!current_out);
+
+ // If we have malformed message (prefix with no subsequent message)
+ // then just silently ignore it.
+ // TODO: The connections should be killed instead.
+ if (msg_->flags () & msg_t::more && msg_->size () == 4) {
+
+ more_out = true;
+
+ // Find the pipe associated with the identity stored in the prefix.
+ // If there's no such pipe just silently ignore the message.
+ uint32_t identity = get_uint32 ((unsigned char*) msg_->data ());
+ outpipes_t::iterator it = outpipes.find (identity);
+
+ if (it != outpipes.end ()) {
+ current_out = it->second.pipe;
+ msg_t empty;
+ int rc = empty.init ();
+ errno_assert (rc == 0);
+ if (!current_out->check_write (&empty)) {
+ it->second.active = false;
+ more_out = false;
+ current_out = NULL;
+ }
+ rc = empty.close ();
+ errno_assert (rc == 0);
+ }
+
+ }
+
+ int rc = msg_->close ();
+ errno_assert (rc == 0);
+ rc = msg_->init ();
+ errno_assert (rc == 0);
+ return 0;
+ }
+
+ // Check whether this is the last part of the message.
+ more_out = msg_->flags () & msg_t::more ? true : false;
+
+ // Push the message into the pipe. If there's no out pipe, just drop it.
+ if (current_out) {
+ bool ok = current_out->write (msg_);
+ if (unlikely (!ok))
+ current_out = NULL;
+ else if (!more_out) {
+ current_out->flush ();
+ current_out = NULL;
+ }
+ }
+ else {
+ int rc = msg_->close ();
+ errno_assert (rc == 0);
+ }
+
+ // Detach the message from the data buffer.
+ int rc = msg_->init ();
+ errno_assert (rc == 0);
+
+ return 0;
+}
+
+int xs::xrespondent_t::xrecv (msg_t *msg_, int flags_)
+{
+ int rc;
+
+ // if there is a prefetched identity, return it.
+ if (prefetched == 2)
+ {
+ rc = msg_->init_size (prefetched_id.size ());
+ errno_assert (rc == 0);
+ memcpy (msg_->data (), prefetched_id.data (), prefetched_id.size ());
+ msg_->set_flags (msg_t::more);
+ prefetched = 1;
+ return 0;
+ }
+
+ // If there is a prefetched message, return it.
+ if (prefetched == 1) {
+ rc = msg_->move (prefetched_msg);
+ errno_assert (rc == 0);
+ more_in = msg_->flags () & msg_t::more ? true : false;
+ prefetched = 0;
+ return 0;
+ }
+
+ // Get next message part.
+ pipe_t *pipe = NULL;
+ rc = fq.recvpipe (msg_, flags_, &pipe);
+ if (rc != 0)
+ return -1;
+
+ // If we are in the middle of reading a message, just return the next part.
+ if (more_in) {
+ more_in = msg_->flags () & msg_t::more ? true : false;
+ return 0;
+ }
+
+ // We are at the beginning of a new message. Move the message part we
+ // have to the prefetched and return the ID of the peer instead.
+ rc = prefetched_msg.move (*msg_);
+ errno_assert (rc == 0);
+ prefetched = 1;
+ rc = msg_->close ();
+ errno_assert (rc == 0);
+
+ blob_t identity = pipe->get_identity ();
+ rc = msg_->init_size (identity.size ());
+ errno_assert (rc == 0);
+ memcpy (msg_->data (), identity.data (), identity.size ());
+ msg_->set_flags (msg_t::more);
+ return 0;
+}
+
+int xs::xrespondent_t::rollback (void)
+{
+ if (current_out) {
+ current_out->rollback ();
+ current_out = NULL;
+ more_out = false;
+ }
+ return 0;
+}
+
+bool xs::xrespondent_t::xhas_in ()
+{
+ // If we are in the middle of reading the messages, there are
+ // definitely more parts available.
+ if (more_in)
+ return true;
+
+ // We may already have a message pre-fetched.
+ if (prefetched)
+ return true;
+
+ // Try to read the next message to the pre-fetch buffer. If anything,
+ // it will be identity of the peer sending the message.
+ msg_t id;
+ id.init ();
+ int rc = xrespondent_t::xrecv (&id, XS_DONTWAIT);
+ if (rc != 0 && errno == EAGAIN) {
+ id.close ();
+ return false;
+ }
+ xs_assert (rc == 0);
+
+ // We have first part of the message prefetched now. We will store the
+ // prefetched identity as well.
+ prefetched_id.assign ((unsigned char*) id.data (), id.size ());
+ id.close ();
+ prefetched = 2;
+
+ return true;
+}
+
+bool xs::xrespondent_t::xhas_out ()
+{
+ return true;
+}
+
+xs::xrespondent_session_t::xrespondent_session_t (io_thread_t *io_thread_,
+ bool connect_, socket_base_t *socket_, const options_t &options_,
+ const char *protocol_, const char *address_) :
+ session_base_t (io_thread_, connect_, socket_, options_, protocol_,
+ address_)
+{
+}
+
+xs::xrespondent_session_t::~xrespondent_session_t ()
+{
+}
+
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