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-rwxr-xr-xsrc/generic.cpp265
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diff --git a/src/generic.cpp b/src/generic.cpp
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-/*
- Copyright (c) 2007-2011 iMatix Corporation
- Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
-
- This file is part of 0MQ.
-
- 0MQ 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.
-
- 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
- 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 "generic.hpp"
-#include "pipe.hpp"
-#include "wire.hpp"
-#include "random.hpp"
-#include "likely.hpp"
-#include "wire.hpp"
-#include "err.hpp"
-
-zmq::generic_t::generic_t (class ctx_t *parent_, uint32_t tid_) :
- socket_base_t (parent_, tid_),
- prefetched (false),
- more_in (false),
- current_out (NULL),
- more_out (false),
- next_peer_id (generate_random ())
-{
- options.type = ZMQ_GENERIC;
-
- prefetched_msg.init ();
-}
-
-zmq::generic_t::~generic_t ()
-{
- zmq_assert (outpipes.empty ());
- prefetched_msg.close ();
-}
-
-void zmq::generic_t::xattach_pipe (pipe_t *pipe_)
-{
- zmq_assert (pipe_);
-
- // Generate a new peer ID. Take care to avoid duplicates.
- outpipes_t::iterator it = outpipes.lower_bound (next_peer_id);
- if (!outpipes.empty ()) {
- while (true) {
- if (it == outpipes.end ())
- it = outpipes.begin ();
- if (it->first != next_peer_id)
- break;
- ++next_peer_id;
- ++it;
- }
- }
-
- // 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;
- zmq_assert (ok);
-
- // Add the pipe to the list of inbound pipes.
- pipe_->set_pipe_id (next_peer_id);
- fq.attach (pipe_);
-
- // Queue the connection command.
- pending_command_t cmd = {1, next_peer_id};
- pending_commands.push_back (cmd);
-
- // Advance next peer ID so that if new connection is dropped shortly after
- // its creation we don't accidentally get two subsequent peers with
- // the same ID.
- ++next_peer_id;
-}
-
-void zmq::generic_t::xterminated (pipe_t *pipe_)
-{
- fq.terminated (pipe_);
-
- for (outpipes_t::iterator it = outpipes.begin ();
- it != outpipes.end (); ++it) {
- if (it->second.pipe == pipe_) {
-
- // Queue the disconnection command.
- pending_command_t cmd = {2, it->first};
- pending_commands.push_back (cmd);
-
- // Remove the pipe.
- outpipes.erase (it);
- if (pipe_ == current_out)
- current_out = NULL;
- return;
- }
- }
- zmq_assert (false);
-}
-
-void zmq::generic_t::xread_activated (pipe_t *pipe_)
-{
- fq.activated (pipe_);
-}
-
-void zmq::generic_t::xwrite_activated (pipe_t *pipe_)
-{
- for (outpipes_t::iterator it = outpipes.begin ();
- it != outpipes.end (); ++it) {
- if (it->second.pipe == pipe_) {
- zmq_assert (!it->second.active);
- it->second.active = true;
- return;
- }
- }
- zmq_assert (false);
-}
-
-int zmq::generic_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) {
- zmq_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::label) {
-
- more_out = true;
-
- // Find the pipe associated with the peer ID stored in the prefix.
- // If there's no such pipe just silently ignore the message.
- zmq_assert (msg_->size () == 4);
- uint32_t peer_id = get_uint32 ((unsigned char*) msg_->data ());
- outpipes_t::iterator it = outpipes.find (peer_id);
-
- 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 | msg_t::label) ? 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_);
- zmq_assert (ok);
- 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 zmq::generic_t::xrecv (msg_t *msg_, int flags_)
-{
- // If there's a queued command, pass it to the caller.
- if (unlikely (!more_in && !pending_commands.empty ())) {
- msg_->init_size (5);
- unsigned char *data = (unsigned char*) msg_->data ();
- put_uint8 (data, pending_commands.front ().cmd);
- put_uint32 (data + 1, pending_commands.front ().peer);
- msg_->set_flags (msg_t::command);
- pending_commands.pop_front ();
- return 0;
- }
-
- // If there is a prefetched message, return it.
- if (prefetched) {
- int rc = msg_->move (prefetched_msg);
- errno_assert (rc == 0);
- more_in = msg_->flags () & (msg_t::more | msg_t::label) ? true : false;
- prefetched = false;
- return 0;
- }
-
- // Get next message part.
- pipe_t *pipe;
- int 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 | msg_t::label) ? 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 = true;
- rc = msg_->close ();
- errno_assert (rc == 0);
- rc = msg_->init_size (4);
- errno_assert (rc == 0);
- put_uint32 ((unsigned char*) msg_->data (), pipe->get_pipe_id ());
- msg_->set_flags (msg_t::label);
- return 0;
-}
-
-int zmq::generic_t::rollback (void)
-{
- if (current_out) {
- current_out->rollback ();
- current_out = NULL;
- more_out = false;
- }
- return 0;
-}
-
-bool zmq::generic_t::xhas_in ()
-{
- if (prefetched)
- return true;
- return fq.has_in ();
-}
-
-bool zmq::generic_t::xhas_out ()
-{
- // In theory, GENERIC socket is always ready for writing. Whether actual
- // attempt to write succeeds depends on whitch pipe the message is going
- // to be routed to.
- return true;
-}
-
-
-