Create InitialConnection for TCP initial peers 3.x & 2.14 (#4946)

* Refs #20650: Add test

Signed-off-by: cferreiragonz <carlosferreira@eprosima.com>

* Refs #20650: Use OpenOutputChannels for initialPeers

Signed-off-by: cferreiragonz <carlosferreira@eprosima.com>

---------

Signed-off-by: cferreiragonz <carlosferreira@eprosima.com>
(cherry picked from commit 068092b)

src/cpp/rtps/builtin/discovery/participant/PDPSimple.cpp

@@ -379,7 +379,12 @@ bool PDPSimple::create_dcps_participant_endpoints()
 
     WriterAttributes watt = create_builtin_writer_attributes();
     watt.endpoint.reliabilityKind = BEST_EFFORT;
-    watt.endpoint.remoteLocatorList = m_discovery.initialPeersList;
+    if (!m_discovery.initialPeersList.empty())
+    {
+        auto entry = LocatorSelectorEntry::create_fully_selected_entry(
+            m_discovery.initialPeersList, LocatorList_t());
+        mp_RTPSParticipant->createSenderResources(entry);
+    }
 
     if (pattr.throughputController.bytesPerPeriod != UINT32_MAX && pattr.throughputController.periodMillisecs != 0)
     {

src/cpp/rtps/transport/UDPTransportInterface.cpp

@@ -432,6 +432,19 @@ bool UDPTransportInterface::OpenOutputChannel(
     return true;
 }
 
+bool UDPTransportInterface::OpenOutputChannels(
+        SendResourceList& send_resource_list,
+        const LocatorSelectorEntry& locator_selector_entry)
+{
+    bool success = false;
+    for (size_t i = 0; i < locator_selector_entry.state.unicast.size(); ++i)
+    {
+        size_t index = locator_selector_entry.state.unicast[i];
+        success |= OpenOutputChannel(send_resource_list, locator_selector_entry.unicast[index]);
+    }
+    return success;
+}
+
 Locator UDPTransportInterface::RemoteToMainLocal(
         const Locator& remote) const
 {

src/cpp/rtps/transport/UDPTransportInterface.h

@@ -80,6 +80,18 @@ class UDPTransportInterface : public TransportInterface
             SendResourceList& sender_resource_list,
             const Locator&) override;
 
+    /**
+     * Opens a socket on the locators provided by the given locator_selector_entry.
+     *
+     * @param sender_resource_list Participant's send resource list.
+     * @param locator_selector_entry Locator selector entry with the remote entity locators.
+     *
+     * @return true if the socket was correctly opened or if finding an already opened one.
+     */
+    bool OpenOutputChannels(
+            SendResourceList& sender_resource_list,
+            const LocatorSelectorEntry& locator_selector_entry) override;
+
     /**
      * Converts a given remote locator (that is, a locator referring to a remote
      * destination) to the main local locator whose channel can write to that

src/cpp/rtps/transport/shared_mem/SharedMemTransport.cpp

@@ -388,6 +388,19 @@ bool SharedMemTransport::OpenOutputChannel(
     return true;
 }
 
+bool SharedMemTransport::OpenOutputChannels(
+        SendResourceList& send_resource_list,
+        const LocatorSelectorEntry& locator_selector_entry)
+{
+    bool success = false;
+    for (size_t i = 0; i < locator_selector_entry.state.unicast.size(); ++i)
+    {
+        size_t index = locator_selector_entry.state.unicast[i];
+        success |= OpenOutputChannel(send_resource_list, locator_selector_entry.unicast[index]);
+    }
+    return success;
+}
+
 Locator SharedMemTransport::RemoteToMainLocal(
         const Locator& remote) const
 {

src/cpp/rtps/transport/shared_mem/SharedMemTransport.h

@@ -87,6 +87,18 @@ class SharedMemTransport : public TransportInterface
             SendResourceList& sender_resource_list,
             const Locator&) override;
 
+    /**
+     * Opens a socket on the locators provided by the given locator_selector_entry.
+     *
+     * @param sender_resource_list Participant's send resource list.
+     * @param locator_selector_entry Locator selector entry with the remote entity locators.
+     *
+     * @return true if the socket was correctly opened or if finding an already opened one.
+     */
+    bool OpenOutputChannels(
+            SendResourceList& sender_resource_list,
+            const LocatorSelectorEntry& locator_selector_entry) override;
+
     /**
      * Converts a given remote locator (that is, a locator referring to a remote
      * destination) to the main local locator whose channel can write to that

test/blackbox/common/BlackboxTestsTransportTCP.cpp

@@ -674,7 +674,7 @@ TEST(TransportTCP, Client_reconnection)
     delete requester;
 }
 
-// Test copy constructor and copy assignment for TCPv4
+// Test zero listening port for TCPv4
 TEST_P(TransportTCP, TCPv4_autofill_port)
 {
     PubSubReader<HelloWorldPubSubType> p1(TEST_TOPIC_NAME);
@@ -704,7 +704,7 @@ TEST_P(TransportTCP, TCPv4_autofill_port)
     EXPECT_TRUE(IPLocator::getPhysicalPort(p2_locators.begin()[0]) == port);
 }
 
-// Test copy constructor and copy assignment for TCPv6
+// Test zero listening port for TCPv6
 TEST_P(TransportTCP, TCPv6_autofill_port)
 {
     PubSubReader<HelloWorldPubSubType> p1(TEST_TOPIC_NAME);
@@ -1325,6 +1325,66 @@ TEST_P(TransportTCP, large_message_large_data_send_receive)
     reader.block_for_all();
 }
 
+// Test CreateInitialConnection for TCP
+TEST_P(TransportTCP, TCP_initial_peers_connection)
+{
+    PubSubWriter<HelloWorldPubSubType> p1(TEST_TOPIC_NAME);
+    PubSubReader<HelloWorldPubSubType> p2(TEST_TOPIC_NAME);
+    PubSubReader<HelloWorldPubSubType> p3(TEST_TOPIC_NAME);
+
+    // Add TCP Transport with listening port
+    auto p1_transport = std::make_shared<eprosima::fastdds::rtps::TCPv4TransportDescriptor>();
+    p1_transport->add_listener_port(global_port);
+    auto p2_transport = std::make_shared<eprosima::fastdds::rtps::TCPv4TransportDescriptor>();
+    p2_transport->add_listener_port(global_port + 1);
+    auto p3_transport = std::make_shared<eprosima::fastdds::rtps::TCPv4TransportDescriptor>();
+    p3_transport->add_listener_port(global_port - 1);
+
+    // Add initial peer to clients
+    Locator_t initialPeerLocator;
+    initialPeerLocator.kind = LOCATOR_KIND_TCPv4;
+    IPLocator::setIPv4(initialPeerLocator, 127, 0, 0, 1);
+    initialPeerLocator.port = global_port;
+    LocatorList_t initial_peer_list;
+    initial_peer_list.push_back(initialPeerLocator);
+
+    // Setup participants
+    p1.disable_builtin_transport()
+            .add_user_transport_to_pparams(p1_transport);
+
+    p2.disable_builtin_transport()
+            .initial_peers(initial_peer_list)
+            .add_user_transport_to_pparams(p2_transport);
+
+    p3.disable_builtin_transport()
+            .initial_peers(initial_peer_list)
+            .add_user_transport_to_pparams(p3_transport);
+
+    // Init participants
+    p1.init();
+    p2.init();
+    p3.init();
+    ASSERT_TRUE(p1.isInitialized());
+    ASSERT_TRUE(p2.isInitialized());
+    ASSERT_TRUE(p3.isInitialized());
+
+    // Wait for discovery
+    p1.wait_discovery(2, std::chrono::seconds(0));
+    p2.wait_discovery(std::chrono::seconds(0), 1);
+    p3.wait_discovery(std::chrono::seconds(0), 1);
+
+    // Send and receive data
+    auto data = default_helloworld_data_generator();
+    p2.startReception(data);
+    p3.startReception(data);
+
+    p1.send(data);
+    EXPECT_TRUE(data.empty());
+
+    p2.block_for_all();
+    p3.block_for_all();
+}
+
 #ifdef INSTANTIATE_TEST_SUITE_P
 #define GTEST_INSTANTIATE_TEST_MACRO(x, y, z, w) INSTANTIATE_TEST_SUITE_P(x, y, z, w)
 #else