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253e9dd27b
Solution: if all peers of a socket are >= 3.1 use sub/cancel commands instead of the old 0/1 messages. For backward compatibility, move the handling of 0/1 or sub/cancel command strings to the encoders, so that the right thing can be done depending on the protocol version. Do not set the command flag until the encoder, so that we can handle the inproc case (which skips the encoder).
85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.hpp"
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#include "sub.hpp"
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#include "msg.hpp"
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zmq::sub_t::sub_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
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xsub_t (parent_, tid_, sid_)
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{
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options.type = ZMQ_SUB;
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// Switch filtering messages on (as opposed to XSUB which where the
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// filtering is off).
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options.filter = true;
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}
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zmq::sub_t::~sub_t ()
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{
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}
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int zmq::sub_t::xsetsockopt (int option_,
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const void *optval_,
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size_t optvallen_)
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{
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if (option_ != ZMQ_SUBSCRIBE && option_ != ZMQ_UNSUBSCRIBE) {
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errno = EINVAL;
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return -1;
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}
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// Create the subscription message.
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msg_t msg;
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int rc;
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const unsigned char *data = static_cast<const unsigned char *> (optval_);
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if (option_ == ZMQ_SUBSCRIBE) {
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rc = msg.init_subscribe (optvallen_, data);
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} else {
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rc = msg.init_cancel (optvallen_, data);
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}
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errno_assert (rc == 0);
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// Pass it further on in the stack.
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rc = xsub_t::xsend (&msg);
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return close_and_return (&msg, rc);
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}
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int zmq::sub_t::xsend (msg_t *)
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{
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// Override the XSUB's send.
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errno = ENOTSUP;
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return -1;
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}
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bool zmq::sub_t::xhas_out ()
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{
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// Override the XSUB's send.
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return false;
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}
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