Add tests for PUSH/PULL sockets.

tests/Makefile.am

@@ -28,7 +28,8 @@ noinst_PROGRAMS = test_pair_inproc \
                   test_spec_req \
                   test_spec_rep \
                   test_spec_dealer \
-                  test_spec_router
+                  test_spec_router \
+                  test_spec_pushpull
 
 if !ON_MINGW
 noinst_PROGRAMS += test_shutdown_stress \
@@ -63,6 +64,7 @@ test_spec_req_SOURCES = test_spec_req.cpp
 test_spec_rep_SOURCES = test_spec_rep.cpp
 test_spec_dealer_SOURCES = test_spec_dealer.cpp
 test_spec_router_SOURCES = test_spec_router.cpp
+test_spec_pushpull_SOURCES = test_spec_pushpull.cpp
 if !ON_MINGW
 test_shutdown_stress_SOURCES = test_shutdown_stress.cpp
 test_pair_ipc_SOURCES = test_pair_ipc.cpp testutil.hpp

tests/test_spec_pushpull.cpp

+/*
+    Copyright (c) 2007-2013 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 <stdio.h>
+#include <stdlib.h>
+#include "testutil.hpp"
+
+void test_push_round_robin_out (void *ctx)
+{
+    void *push = zmq_socket (ctx, ZMQ_PUSH);
+    assert (push);
+
+    int rc = zmq_bind (push, "inproc://b");
+    assert (rc == 0);
+
+    const size_t N = 5;
+    void *pulls[N];
+    for (size_t i = 0; i < N; ++i)
+    {
+        pulls[i] = zmq_socket (ctx, ZMQ_PULL);
+        assert (pulls[i]);
+
+        int timeout = 100;
+        rc = zmq_setsockopt (pulls[i], ZMQ_RCVTIMEO, &timeout, sizeof(int));
+        assert (rc == 0);
+
+        rc = zmq_connect (pulls[i], "inproc://b");
+        assert (rc == 0);
+    }
+
+    // Send 2N messages
+    for (size_t i = 0; i < N; ++i)
+    {
+        s_send_seq (push, "ABC", SEQ_END);
+    }
+    for (size_t i = 0; i < N; ++i)
+    {
+        s_send_seq (push, "DEF", SEQ_END);
+    }
+
+    // Expect every PULL got one of each
+    for (size_t i = 0; i < N; ++i)
+    {
+        s_recv_seq (pulls[i], "ABC", SEQ_END);
+        s_recv_seq (pulls[i], "DEF", SEQ_END);
+    }
+
+    rc = zmq_close (push);
+    assert (rc == 0);
+
+    for (size_t i = 0; i < N; ++i)
+    {
+        rc = zmq_close (pulls[i]);
+        assert (rc == 0);
+    }
+}
+
+void test_pull_fair_queue_in (void *ctx)
+{
+    void *pull = zmq_socket (ctx, ZMQ_PULL);
+    assert (pull);
+
+    int rc = zmq_bind (pull, "inproc://a");
+    assert (rc == 0);
+
+    const size_t N = 5;
+    void *pushs[N];
+    for (size_t i = 0; i < N; ++i)
+    {
+        pushs[i] = zmq_socket (ctx, ZMQ_PUSH);
+        assert (pushs[i]);
+
+        rc = zmq_connect (pushs[i], "inproc://a");
+        assert (rc == 0);
+    }
+
+    // Send 2N messages
+    for (size_t i = 0; i < N; ++i)
+    {
+        char * str = strdup("A");
+        str[0] += i;
+        s_send_seq (pushs[i], str, SEQ_END);
+        str[0] += N;
+        s_send_seq (pushs[i], str, SEQ_END);
+        free (str);
+    }
+
+    // Expect to pull them in order
+    for (size_t i = 0; i < 2*N; ++i)
+    {
+        char * str = strdup("A");
+        str[0] += i;
+        s_recv_seq (pull, str, SEQ_END);
+        free (str);
+    }
+
+    rc = zmq_close (pull);
+    assert (rc == 0);
+
+    for (size_t i = 0; i < N; ++i)
+    {
+        rc = zmq_close (pushs[i]);
+        assert (rc == 0);
+    }
+}
+
+void test_push_block_on_send_no_peers (void *ctx)
+{
+    void *sc = zmq_socket (ctx, ZMQ_PUSH);
+    assert (sc);
+
+    int timeout = 100;
+    int rc = zmq_setsockopt (sc, ZMQ_SNDTIMEO, &timeout, sizeof(timeout));
+    assert (rc == 0);
+
+    rc = zmq_send (sc, 0, 0, ZMQ_DONTWAIT);
+    assert (rc == -1);
+    assert (errno == EAGAIN);
+
+    rc = zmq_send (sc, 0, 0, 0);
+    assert (rc == -1);
+    assert (errno == EAGAIN);
+
+    rc = zmq_close (sc);
+    assert (rc == 0);
+}
+
+void test_destroy_queue_on_disconnect (void *ctx)
+{
+    void *A = zmq_socket (ctx, ZMQ_PUSH);
+    assert (A);
+
+    int hwm = 1;
+    int rc = zmq_setsockopt (A, ZMQ_SNDHWM, &hwm, sizeof(hwm));
+    assert (rc == 0);
+
+    rc = zmq_bind (A, "inproc://d");
+    assert (rc == 0);
+
+    void *B = zmq_socket (ctx, ZMQ_PULL);
+    assert (B);
+
+    rc = zmq_setsockopt (B, ZMQ_RCVHWM, &hwm, sizeof(hwm));
+    assert (rc == 0);
+
+    rc = zmq_connect (B, "inproc://d");
+    assert (rc == 0);
+
+    // Send two messages, one should be stuck in A's outgoing queue, the other
+    // arrives at B.
+    s_send_seq (A, "ABC", SEQ_END);
+    s_send_seq (A, "DEF", SEQ_END);
+
+    // Both queues should now be full, indicated by A blocking on send.
+    rc = zmq_send (A, 0, 0, ZMQ_DONTWAIT);
+    assert (rc == -1);
+    assert (errno == EAGAIN);
+
+    rc = zmq_disconnect (B, "inproc://d");
+    assert (rc == 0);
+
+    // Disconnect may take time and need command processing.
+    zmq_pollitem_t poller[2] = { { A, 0, 0, 0 }, { B, 0, 0, 0 } };
+    rc = zmq_poll (poller, 2, 100);
+    assert (rc == 0);
+
+    zmq_msg_t msg;
+    rc = zmq_msg_init (&msg);
+    assert (rc == 0);
+
+    // Can't receive old data on B.
+    rc = zmq_msg_recv (&msg, B, ZMQ_DONTWAIT);
+    assert (rc == -1);
+    assert (errno == EAGAIN);
+
+    // Sending fails.
+    rc = zmq_send (A, 0, 0, ZMQ_DONTWAIT);
+    assert (rc == -1);
+    assert (errno == EAGAIN);
+
+    // Reconnect B
+    rc = zmq_connect (B, "inproc://d");
+    assert (rc == 0);
+
+    // Still can't receive old data on B.
+    rc = zmq_msg_recv (&msg, B, ZMQ_DONTWAIT);
+    assert (rc == -1);
+    assert (errno == EAGAIN);
+
+    // two messages should be sendable before the queues are filled up.
+    s_send_seq (A, "ABC", SEQ_END);
+    s_send_seq (A, "DEF", SEQ_END);
+
+    rc = zmq_send (A, 0, 0, ZMQ_DONTWAIT);
+    assert (rc == -1);
+    assert (errno == EAGAIN);
+
+    rc = zmq_msg_close (&msg);
+    assert (rc == 0);
+
+    rc = zmq_close (A);
+    assert (rc == 0);
+
+    rc = zmq_close (B);
+    assert (rc == 0);
+}
+
+int main ()
+{
+    void *ctx = zmq_ctx_new ();
+    assert (ctx);
+
+    // PUSH: SHALL route outgoing messages to connected peers using a
+    // round-robin strategy.
+    test_push_round_robin_out (ctx);
+
+    // PULL: SHALL receive incoming messages from its peers using a fair-queuing
+    // strategy.
+    test_pull_fair_queue_in (ctx);
+
+    // PUSH: SHALL block on sending, or return a suitable error, when it has no
+    // available peers.
+    test_push_block_on_send_no_peers (ctx);
+
+    // PUSH and PULL: SHALL create this queue when a peer connects to it. If
+    // this peer disconnects, the socket SHALL destroy its queue and SHALL
+    // discard any messages it contains.
+    test_destroy_queue_on_disconnect (ctx);
+
+    int rc = zmq_ctx_term (ctx);
+    assert (rc == 0);
+
+    return 0 ;
+}