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/*
Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
This file is part of libzmq, the ZeroMQ core engine in C++.
libzmq is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
As a special exception, the Contributors give you permission to link
this library with independent modules to produce an executable,
regardless of the license terms of these independent modules, and to
copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the
terms and conditions of the license of that module. An independent
module is a module which is not derived from or based on this library.
If you modify this library, you must extend this exception to your
version of the library.
libzmq 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 "testutil.hpp"
int test_basic()
{
void *ctx = zmq_ctx_new ();
assert (ctx);
// Create a publisher
void *pub = zmq_socket (ctx, ZMQ_XPUB);
assert (pub);
int rc = zmq_bind (pub, "inproc://soname");
assert (rc == 0);
// set pub socket options
int manual = 1;
rc = zmq_setsockopt(pub, ZMQ_XPUB_MANUAL, &manual, 4);
assert (rc == 0);
// Create a subscriber
void *sub = zmq_socket (ctx, ZMQ_XSUB);
assert (sub);
rc = zmq_connect (sub, "inproc://soname");
assert (rc == 0);
// Subscribe for A
char subscription[2] = { 1, 'A'};
rc = zmq_send_const(sub, subscription, 2, 0);
assert (rc == 2);
char buffer[2];
// Receive subscriptions from subscriber
rc = zmq_recv(pub, buffer, 2, 0);
assert(rc == 2);
assert(buffer[0] == 1);
assert(buffer[1] == 'A');
// Subscribe socket for B instead
rc = zmq_setsockopt(pub, ZMQ_SUBSCRIBE, "B", 1);
assert(rc == 0);
// Sending A message and B Message
rc = zmq_send_const(pub, "A", 1, 0);
assert(rc == 1);
rc = zmq_send_const(pub, "B", 1, 0);
assert(rc == 1);
rc = zmq_recv(sub, buffer, 1, ZMQ_DONTWAIT);
assert(rc == 1);
assert(buffer[0] == 'B');
// Clean up.
rc = zmq_close (pub);
assert (rc == 0);
rc = zmq_close (sub);
assert (rc == 0);
rc = zmq_ctx_term (ctx);
assert (rc == 0);
return 0 ;
}
int test_xpub_proxy_unsubscribe_on_disconnect()
{
const char* frontend = "ipc://frontend";
const char* backend = "ipc://backend";
const char* topic = "1";
const char* payload = "X";
int manual = 1;
void *ctx = zmq_ctx_new ();
assert (ctx);
// proxy frontend
void *xsub_proxy = zmq_socket (ctx, ZMQ_XSUB);
assert (xsub_proxy);
assert (zmq_bind (xsub_proxy, frontend) == 0);
// proxy backend
void *xpub_proxy = zmq_socket (ctx, ZMQ_XPUB);
assert (xpub_proxy);
assert (zmq_setsockopt (xpub_proxy, ZMQ_XPUB_MANUAL, &manual, 4) == 0);
assert (zmq_bind (xpub_proxy, backend) == 0);
// publisher
void *pub = zmq_socket (ctx, ZMQ_PUB);
assert (zmq_connect (pub, frontend) == 0);
// first subscriber subscribes
void *sub1 = zmq_socket (ctx, ZMQ_SUB);
assert (sub1);
assert (zmq_connect (sub1, backend) == 0);
assert (zmq_setsockopt (sub1, ZMQ_SUBSCRIBE, topic, 1) == 0);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// proxy reroutes and confirms subscriptions
char sub_buff[2];
assert (zmq_recv (xpub_proxy, sub_buff, 2, ZMQ_DONTWAIT) == 2);
assert (sub_buff [0] == 1);
assert (sub_buff [1] == *topic);
assert (zmq_setsockopt (xpub_proxy, ZMQ_SUBSCRIBE, topic, 1) == 0);
assert (zmq_send (xsub_proxy, sub_buff, 2, 0) == 2);
// second subscriber subscribes
void *sub2 = zmq_socket (ctx, ZMQ_SUB);
assert (sub2);
assert (zmq_connect (sub2, backend) == 0);
assert (zmq_setsockopt (sub2, ZMQ_SUBSCRIBE, topic, 1) == 0);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// proxy reroutes
assert (zmq_recv (xpub_proxy, sub_buff, 2, ZMQ_DONTWAIT) == 2);
assert (sub_buff [0] == 1);
assert (sub_buff [1] == *topic);
assert (zmq_setsockopt (xpub_proxy, ZMQ_SUBSCRIBE, topic, 1) == 0);
assert (zmq_send (xsub_proxy, sub_buff, 2, 0) == 2);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// let publisher send a msg
assert (zmq_send (pub, topic, 1, ZMQ_SNDMORE) == 1);
assert (zmq_send (pub, payload, 1, 0) == 1);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// proxy reroutes data messages to subscribers
char topic_buff[1];
char data_buff[1];
assert (zmq_recv (xsub_proxy, topic_buff, 1, ZMQ_DONTWAIT) == 1);
assert (topic_buff [0] == *topic);
assert (zmq_recv (xsub_proxy, data_buff, 1, ZMQ_DONTWAIT) == 1);
assert (data_buff [0] == *payload);
assert (zmq_send (xpub_proxy, topic_buff, 1, ZMQ_SNDMORE) == 1);
assert (zmq_send (xpub_proxy, data_buff, 1, 0) == 1);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// each subscriber should now get a message
assert (zmq_recv (sub2, topic_buff, 1, ZMQ_DONTWAIT) == 1);
assert (topic_buff [0] == *topic);
assert (zmq_recv (sub2, data_buff, 1, ZMQ_DONTWAIT) == 1);
assert (data_buff [0] == *payload);
assert (zmq_recv (sub1, topic_buff, 1, ZMQ_DONTWAIT) == 1);
assert (topic_buff [0] == *topic);
assert (zmq_recv (sub1, data_buff, 1, ZMQ_DONTWAIT) == 1);
assert (data_buff [0] == *payload);
// Disconnect both subscribers
assert (zmq_close (sub1) == 0);
assert (zmq_close (sub2) == 0);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// unsubscribe messages are passed from proxy to publisher
assert (zmq_recv (xpub_proxy, sub_buff, 2, 0) == 2);
assert (sub_buff [0] == 0);
assert (sub_buff [1] == *topic);
assert (zmq_setsockopt (xpub_proxy, ZMQ_UNSUBSCRIBE, topic, 1) == 0);
assert (zmq_send (xsub_proxy, sub_buff, 2, 0) == 2);
// should receive another unsubscribe msg
assert (zmq_recv (xpub_proxy, sub_buff, 2, 0) == 2
&& "Should receive the second unsubscribe message.");
assert (sub_buff [0] == 0);
assert (sub_buff [1] == *topic);
assert (zmq_setsockopt (xpub_proxy, ZMQ_UNSUBSCRIBE, topic, 1) == 0);
assert (zmq_send (xsub_proxy, sub_buff, 2, 0) == 2);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// let publisher send a msg
assert (zmq_send (pub, topic, 1, ZMQ_SNDMORE) == 1);
assert (zmq_send (pub, payload, 1, 0) == 1);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// nothing should come to the proxy
assert (zmq_recv (xsub_proxy, topic_buff, 1, ZMQ_DONTWAIT) == -1);
assert (errno == EAGAIN);
assert (zmq_close (pub) == 0);
assert (zmq_close (xpub_proxy) == 0);
assert (zmq_close (xsub_proxy) == 0);
assert (zmq_ctx_term (ctx) == 0);
return 0;
}
int test_missing_subscriptions()
{
const char* frontend = "ipc://frontend";
const char* backend = "ipc://backend";
const char* topic1 = "1";
const char* topic2 = "2";
const char* payload = "X";
int manual = 1;
void *ctx = zmq_ctx_new ();
assert (ctx);
// proxy frontend
void *xsub_proxy = zmq_socket (ctx, ZMQ_XSUB);
assert (xsub_proxy);
assert (zmq_bind (xsub_proxy, frontend) == 0);
// proxy backend
void *xpub_proxy = zmq_socket (ctx, ZMQ_XPUB);
assert (xpub_proxy);
assert (zmq_setsockopt (xpub_proxy, ZMQ_XPUB_MANUAL, &manual, 4) == 0);
assert (zmq_bind (xpub_proxy, backend) == 0);
// publisher
void *pub = zmq_socket (ctx, ZMQ_PUB);
assert (zmq_connect (pub, frontend) == 0);
// Here's the problem: because subscribers subscribe in quick succession,
// the proxy is unable to confirm the first subscription before receiving
// the second. This causes the first subscription to get lost.
// first subscriber
void *sub1 = zmq_socket (ctx, ZMQ_SUB);
assert (sub1);
assert (zmq_connect (sub1, backend) == 0);
assert (zmq_setsockopt (sub1, ZMQ_SUBSCRIBE, topic1, 1) == 0);
// second subscriber
void *sub2 = zmq_socket (ctx, ZMQ_SUB);
assert (sub2);
assert (zmq_connect (sub2, backend) == 0);
assert (zmq_setsockopt (sub2, ZMQ_SUBSCRIBE, topic2, 1) == 0);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// proxy now reroutes and confirms subscriptions
char buffer[2];
assert (zmq_recv (xpub_proxy, buffer, 2, ZMQ_DONTWAIT) == 2);
assert (buffer [0] == 1);
assert (buffer [1] == *topic1);
assert (zmq_setsockopt (xpub_proxy, ZMQ_SUBSCRIBE, topic1, 1) == 0);
assert (zmq_send (xsub_proxy, buffer, 2, 0) == 2);
assert (zmq_recv (xpub_proxy, buffer, 2, ZMQ_DONTWAIT) == 2);
assert (buffer [0] == 1);
assert (buffer [1] == *topic2);
assert (zmq_setsockopt (xpub_proxy, ZMQ_SUBSCRIBE, topic2, 1) == 0);
assert (zmq_send (xsub_proxy, buffer, 2, 0) == 2);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// let publisher send 2 msgs, each with its own topic
assert (zmq_send (pub, topic1, 1, ZMQ_SNDMORE) == 1);
assert (zmq_send (pub, payload, 1, 0) == 1);
assert (zmq_send (pub, topic2, 1, ZMQ_SNDMORE) == 1);
assert (zmq_send (pub, payload, 1, 0) == 1);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// proxy reroutes data messages to subscribers
char topic_buff [1];
char data_buff [1];
assert (zmq_recv (xsub_proxy, topic_buff, 1, ZMQ_DONTWAIT) == 1);
assert (topic_buff [0] == *topic1);
assert (zmq_recv (xsub_proxy, data_buff, 1, ZMQ_DONTWAIT) == 1);
assert (data_buff [0] == *payload);
assert (zmq_send (xpub_proxy, topic_buff, 1, ZMQ_SNDMORE) == 1);
assert (zmq_send (xpub_proxy, data_buff, 1, 0) == 1);
assert (zmq_recv (xsub_proxy, topic_buff, 1, ZMQ_DONTWAIT) == 1);
assert (topic_buff [0] == *topic2);
assert (zmq_recv (xsub_proxy, data_buff, 1, ZMQ_DONTWAIT) == 1);
assert (data_buff [0] == *payload);
assert (zmq_send (xpub_proxy, topic_buff, 1, ZMQ_SNDMORE) == 1);
assert (zmq_send (xpub_proxy, data_buff, 1, 0) == 1);
// wait
assert (zmq_poll (0, 0, 100) == 0);
// each subscriber should now get a message
assert (zmq_recv (sub2, topic_buff, 1, ZMQ_DONTWAIT) == 1);
assert (topic_buff [0] == *topic2);
assert (zmq_recv (sub2, data_buff, 1, ZMQ_DONTWAIT) == 1);
assert (data_buff [0] == *payload);
assert (zmq_recv (sub1, topic_buff, 1, ZMQ_DONTWAIT) == 1);
assert (topic_buff [0] == *topic1);
assert (zmq_recv (sub1, data_buff, 1, ZMQ_DONTWAIT) == 1);
assert (data_buff [0] == *payload);
// Clean up
assert (zmq_close (sub1) == 0);
assert (zmq_close (sub2) == 0);
assert (zmq_close (pub) == 0);
assert (zmq_close (xpub_proxy) == 0);
assert (zmq_close (xsub_proxy) == 0);
assert (zmq_ctx_term (ctx) == 0);
return 0;
}
int main(void)
{
setup_test_environment ();
test_basic ();
test_xpub_proxy_unsubscribe_on_disconnect ();
test_missing_subscriptions ();
return 0;
}