Netty4TransportPublishAddressIT.java example

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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.transport.netty4;

import org.elasticsearch.ESNetty4IntegTestCase;
import org.elasticsearch.action.admin.cluster.node.info.NodeInfo;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoResponse;
import org.elasticsearch.common.network.NetworkModule;
import org.elasticsearch.common.network.NetworkUtils;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.BoundTransportAddress;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.test.ESIntegTestCase;
import org.elasticsearch.transport.Netty4Plugin;

import java.net.Inet4Address;

import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.instanceOf;

/**
 * Checks that Elasticsearch produces a sane publish_address when it binds to
 * different ports on ipv4 and ipv6.
 */
@ESIntegTestCase.ClusterScope(scope = ESIntegTestCase.Scope.TEST, numDataNodes = 0)
public class Netty4TransportPublishAddressIT extends ESNetty4IntegTestCase {
    @Override
    protected Settings nodeSettings(int nodeOrdinal) {
        return Settings.builder()
            .put(super.nodeSettings(nodeOrdinal))
            .put(NetworkModule.TRANSPORT_TYPE_KEY, Netty4Plugin.NETTY_TRANSPORT_NAME)
            .build();
    }

    public void testDifferentPorts() throws Exception {
        if (!NetworkUtils.SUPPORTS_V6) {
            return;
        }
        logger.info("--> starting a node on ipv4 only");
        Settings ipv4Settings = Settings.builder().put("network.host", "127.0.0.1").build();
        String ipv4OnlyNode = internalCluster().startNode(ipv4Settings); // should bind 127.0.0.1:XYZ

        logger.info("--> starting a node on ipv4 and ipv6");
        Settings bothSettings = Settings.builder().put("network.host", "_local_").build();
        internalCluster().startNode(bothSettings); // should bind [::1]:XYZ and 127.0.0.1:XYZ+1

        logger.info("--> waiting for the cluster to declare itself stable");
        ensureStableCluster(2); // fails if port of publish address does not match corresponding bound address

        logger.info("--> checking if boundAddress matching publishAddress has same port");
        NodesInfoResponse nodesInfoResponse = client().admin().cluster().prepareNodesInfo().get();
        for (NodeInfo nodeInfo : nodesInfoResponse.getNodes()) {
            BoundTransportAddress boundTransportAddress = nodeInfo.getTransport().getAddress();
            if (nodeInfo.getNode().getName().equals(ipv4OnlyNode)) {
                assertThat(boundTransportAddress.boundAddresses().length, equalTo(1));
                assertThat(boundTransportAddress.boundAddresses()[0].getPort(), equalTo(boundTransportAddress.publishAddress().getPort()));
            } else {
                assertThat(boundTransportAddress.boundAddresses().length, greaterThan(1));
                for (TransportAddress boundAddress : boundTransportAddress.boundAddresses()) {
                    assertThat(boundAddress, instanceOf(TransportAddress.class));
                    TransportAddress inetBoundAddress = (TransportAddress) boundAddress;
                    if (inetBoundAddress.address().getAddress() instanceof Inet4Address) {
                        // IPv4 address is preferred publish address for _local_
                        assertThat(inetBoundAddress.getPort(), equalTo(boundTransportAddress.publishAddress().getPort()));
                    }
                }
            }
        }
    }

}