Fix unit tests to bind to port 0.

I will followup with ITs and other modules. By fixing this, these tests become more reliable (will never sporatically
fail due to other stuff on your machine: ports are assigned by the OS), and it allows us to move forward with
gradle parallel builds, in my tests this is a nice speedup, but we can't do it until tests are cleaned up

core/src/test/java/org/elasticsearch/http/netty/NettyHttpServerPipeliningTests.java

@@ -91,7 +91,10 @@ public class NettyHttpServerPipeliningTests extends ESTestCase {
     }
 
     public void testThatHttpPipeliningWorksWhenEnabled() throws Exception {
-        Settings settings = settingsBuilder().put("http.pipelining", true).build();
+        Settings settings = settingsBuilder()
+                               .put("http.pipelining", true)
+                               .put("http.port", "0")
+                               .build();
         httpServerTransport = new CustomNettyHttpServerTransport(settings);
         httpServerTransport.start();
         InetSocketTransportAddress transportAddress = (InetSocketTransportAddress) randomFrom(httpServerTransport.boundAddress().boundAddresses());
@@ -105,7 +108,10 @@ public class NettyHttpServerPipeliningTests extends ESTestCase {
     }
 
     public void testThatHttpPipeliningCanBeDisabled() throws Exception {
-        Settings settings = settingsBuilder().put("http.pipelining", false).build();
+        Settings settings = settingsBuilder()
+                                .put("http.pipelining", false)
+                                .put("http.port", "0")
+                                .build();
         httpServerTransport = new CustomNettyHttpServerTransport(settings);
         httpServerTransport.start();
         InetSocketTransportAddress transportAddress = (InetSocketTransportAddress) randomFrom(httpServerTransport.boundAddress().boundAddresses());

core/src/test/java/org/elasticsearch/http/netty/pipelining/HttpPipeliningHandlerTests.java

@@ -76,8 +76,6 @@ public class HttpPipeliningHandlerTests extends ESTestCase {
     private static final long RESPONSE_TIMEOUT = 10000L;
     private static final long CONNECTION_TIMEOUT = 10000L;
     private static final String CONTENT_TYPE_TEXT = "text/plain; charset=UTF-8";
-    // TODO make me random
-    private static final InetSocketAddress HOST_ADDR = new InetSocketAddress(InetAddress.getLoopbackAddress(), 9080);
     private static final String PATH1 = "/1";
     private static final String PATH2 = "/2";
     private static final String SOME_RESPONSE_TEXT = "some response for ";
@@ -90,6 +88,8 @@ public class HttpPipeliningHandlerTests extends ESTestCase {
 
     private HashedWheelTimer timer;
 
+    private InetSocketAddress boundAddress;
+
     @Before
     public void startBootstraps() {
         clientBootstrap = new ClientBootstrap(new NioClientSocketChannelFactory());
@@ -118,7 +118,8 @@ public class HttpPipeliningHandlerTests extends ESTestCase {
             }
         });
 
-        serverBootstrap.bind(HOST_ADDR);
+        Channel channel = serverBootstrap.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
+        boundAddress = (InetSocketAddress) channel.getLocalAddress();
 
         timer = new HashedWheelTimer();
     }
@@ -137,7 +138,7 @@ public class HttpPipeliningHandlerTests extends ESTestCase {
         responsesIn = new CountDownLatch(1);
         responses.clear();
 
-        final ChannelFuture connectionFuture = clientBootstrap.connect(HOST_ADDR);
+        final ChannelFuture connectionFuture = clientBootstrap.connect(boundAddress);
 
         assertTrue(connectionFuture.await(CONNECTION_TIMEOUT));
         final Channel clientChannel = connectionFuture.getChannel();
@@ -145,11 +146,11 @@ public class HttpPipeliningHandlerTests extends ESTestCase {
         // NetworkAddress.formatAddress makes a proper HOST header.
         final HttpRequest request1 = new DefaultHttpRequest(
                 HTTP_1_1, HttpMethod.GET, PATH1);
-        request1.headers().add(HOST, NetworkAddress.formatAddress(HOST_ADDR));
+        request1.headers().add(HOST, NetworkAddress.formatAddress(boundAddress));
 
         final HttpRequest request2 = new DefaultHttpRequest(
                 HTTP_1_1, HttpMethod.GET, PATH2);
-        request2.headers().add(HOST, NetworkAddress.formatAddress(HOST_ADDR));
+        request2.headers().add(HOST, NetworkAddress.formatAddress(boundAddress));
 
         clientChannel.write(request1);
         clientChannel.write(request2);

core/src/test/java/org/elasticsearch/transport/NettySizeHeaderFrameDecoderTests.java

@@ -50,7 +50,11 @@ import static org.hamcrest.Matchers.is;
  */
 public class NettySizeHeaderFrameDecoderTests extends ESTestCase {
 
-    private final Settings settings = settingsBuilder().put("name", "foo").put("transport.host", "127.0.0.1").build();
+    private final Settings settings = settingsBuilder()
+                                        .put("name", "foo")
+                                        .put("transport.host", "127.0.0.1")
+                                        .put("transport.tcp.port", "0")
+                                        .build();
 
     private ThreadPool threadPool;
     private NettyTransport nettyTransport;

core/src/test/java/org/elasticsearch/transport/netty/NettyScheduledPingTests.java

@@ -49,9 +49,7 @@ public class NettyScheduledPingTests extends ESTestCase {
     public void testScheduledPing() throws Exception {
         ThreadPool threadPool = new ThreadPool(getClass().getName());
 
-        int startPort = 11000 + randomIntBetween(0, 255);
+        Settings settings = Settings.builder().put(NettyTransport.PING_SCHEDULE, "5ms").put("transport.tcp.port", 0).build();
-        int endPort = startPort + 10;
-        Settings settings = Settings.builder().put(NettyTransport.PING_SCHEDULE, "5ms").put("transport.tcp.port", startPort + "-" + endPort).build();
 
         final NettyTransport nettyA = new NettyTransport(settings, threadPool, new NetworkService(settings), BigArrays.NON_RECYCLING_INSTANCE, Version.CURRENT, new NamedWriteableRegistry());
         MockTransportService serviceA = new MockTransportService(settings, nettyA, threadPool);

core/src/test/java/org/elasticsearch/transport/netty/NettyTransportMultiPortTests.java

@@ -18,8 +18,6 @@
  */
 package org.elasticsearch.transport.netty;
 
-import com.carrotsearch.hppc.IntHashSet;
-
 import org.elasticsearch.Version;
 import org.elasticsearch.cache.recycler.PageCacheRecycler;
 import org.elasticsearch.common.component.Lifecycle;
@@ -27,176 +25,115 @@ import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
 import org.elasticsearch.common.network.NetworkService;
 import org.elasticsearch.common.network.NetworkUtils;
 import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.transport.InetSocketTransportAddress;
 import org.elasticsearch.common.util.BigArrays;
 import org.elasticsearch.common.util.MockBigArrays;
 import org.elasticsearch.indices.breaker.NoneCircuitBreakerService;
 import org.elasticsearch.test.ESTestCase;
-import org.elasticsearch.test.junit.rule.RepeatOnExceptionRule;
 import org.elasticsearch.threadpool.ThreadPool;
-import org.elasticsearch.transport.BindTransportException;
 import org.elasticsearch.transport.TransportService;
 import org.junit.Before;
-import org.junit.Rule;
-
-import java.io.IOException;
-import java.io.OutputStream;
-import java.net.InetAddress;
-import java.net.InetSocketAddress;
-import java.net.ServerSocket;
-import java.net.Socket;
-import java.nio.charset.StandardCharsets;
 
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.hamcrest.Matchers.is;
 
 public class NettyTransportMultiPortTests extends ESTestCase {
 
-    private static final int MAX_RETRIES = 10;
     private String host;
 
-    @Rule
-    public RepeatOnExceptionRule repeatOnBindExceptionRule = new RepeatOnExceptionRule(logger, MAX_RETRIES, BindTransportException.class);
-
     @Before
     public void setup() {
-        if (randomBoolean()) {
+        if (NetworkUtils.SUPPORTS_V6 && randomBoolean()) {
-            host = "localhost";
+            host = "::1";
         } else {
-            if (NetworkUtils.SUPPORTS_V6 && randomBoolean()) {
+            host = "127.0.0.1";
-                host = "::1";
-            } else {
-                host = "127.0.0.1";
-            }
         }
     }
 
     public void testThatNettyCanBindToMultiplePorts() throws Exception {
-        int[] ports = getRandomPorts(3);
-
         Settings settings = settingsBuilder()
                 .put("network.host", host)
-                .put("transport.tcp.port", ports[0])
+                .put("transport.tcp.port", 22) // will not actually bind to this
-                .put("transport.profiles.default.port", ports[1])
+                .put("transport.profiles.default.port", 0)
-                .put("transport.profiles.client1.port", ports[2])
+                .put("transport.profiles.client1.port", 0)
                 .build();
 
         ThreadPool threadPool = new ThreadPool("tst");
-        try (NettyTransport ignored = startNettyTransport(settings, threadPool)) {
+        try (NettyTransport transport = startNettyTransport(settings, threadPool)) {
-            assertConnectionRefused(ports[0]);
+            assertEquals(1, transport.profileBoundAddresses().size());
-            assertPortIsBound(ports[1]);
+            assertEquals(1, transport.boundAddress().boundAddresses().length);
-            assertPortIsBound(ports[2]);
         } finally {
             terminate(threadPool);
         }
     }
 
     public void testThatDefaultProfileInheritsFromStandardSettings() throws Exception {
-        int[] ports = getRandomPorts(2);
-
         Settings settings = settingsBuilder()
                 .put("network.host", host)
-                .put("transport.tcp.port", ports[0])
+                .put("transport.tcp.port", 0)
-                .put("transport.profiles.client1.port", ports[1])
+                .put("transport.profiles.client1.port", 0)
                 .build();
 
         ThreadPool threadPool = new ThreadPool("tst");
-        try (NettyTransport ignored = startNettyTransport(settings, threadPool)) {
+        try (NettyTransport transport = startNettyTransport(settings, threadPool)) {
-            assertPortIsBound(ports[0]);
+            assertEquals(1, transport.profileBoundAddresses().size());
-            assertPortIsBound(ports[1]);
+            assertEquals(1, transport.boundAddress().boundAddresses().length);
         } finally {
             terminate(threadPool);
         }
     }
 
     public void testThatProfileWithoutPortSettingsFails() throws Exception {
-        int[] ports = getRandomPorts(1);
 
         Settings settings = settingsBuilder()
                 .put("network.host", host)
-                .put("transport.tcp.port", ports[0])
+                .put("transport.tcp.port", 0)
                 .put("transport.profiles.client1.whatever", "foo")
                 .build();
 
         ThreadPool threadPool = new ThreadPool("tst");
-        try (NettyTransport ignored = startNettyTransport(settings, threadPool)) {
+        try (NettyTransport transport = startNettyTransport(settings, threadPool)) {
-            assertPortIsBound(ports[0]);
+            assertEquals(0, transport.profileBoundAddresses().size());
+            assertEquals(1, transport.boundAddress().boundAddresses().length);
         } finally {
             terminate(threadPool);
         }
     }
 
     public void testThatDefaultProfilePortOverridesGeneralConfiguration() throws Exception {
-        int[] ports = getRandomPorts(3);
-
         Settings settings = settingsBuilder()
                 .put("network.host", host)
-                .put("transport.tcp.port", ports[0])
+                .put("transport.tcp.port", 22) // will not actually bind to this
-                .put("transport.netty.port", ports[1])
+                .put("transport.netty.port", 23) // will not actually bind to this
-                .put("transport.profiles.default.port", ports[2])
+                .put("transport.profiles.default.port", 0)
                 .build();
 
         ThreadPool threadPool = new ThreadPool("tst");
-        try (NettyTransport ignored = startNettyTransport(settings, threadPool)) {
+        try (NettyTransport transport = startNettyTransport(settings, threadPool)) {
-            assertConnectionRefused(ports[0]);
+            assertEquals(0, transport.profileBoundAddresses().size());
-            assertConnectionRefused(ports[1]);
+            assertEquals(1, transport.boundAddress().boundAddresses().length);
-            assertPortIsBound(ports[2]);
         } finally {
             terminate(threadPool);
         }
     }
 
     public void testThatProfileWithoutValidNameIsIgnored() throws Exception {
-        int[] ports = getRandomPorts(3);
-
         Settings settings = settingsBuilder()
                 .put("network.host", host)
-                .put("transport.tcp.port", ports[0])
+                .put("transport.tcp.port", 0)
                 // mimics someone trying to define a profile for .local which is the profile for a node request to itself
-                .put("transport.profiles." + TransportService.DIRECT_RESPONSE_PROFILE + ".port", ports[1])
+                .put("transport.profiles." + TransportService.DIRECT_RESPONSE_PROFILE + ".port", 22) // will not actually bind to this
-                .put("transport.profiles..port", ports[2])
+                .put("transport.profiles..port", 23) // will not actually bind to this
                 .build();
 
         ThreadPool threadPool = new ThreadPool("tst");
-        try (NettyTransport ignored = startNettyTransport(settings, threadPool)) {
+        try (NettyTransport transport = startNettyTransport(settings, threadPool)) {
-            assertPortIsBound(ports[0]);
+            assertEquals(0, transport.profileBoundAddresses().size());
-            assertConnectionRefused(ports[1]);
+            assertEquals(1, transport.boundAddress().boundAddresses().length);
-            assertConnectionRefused(ports[2]);
         } finally {
             terminate(threadPool);
         }
     }
 
-    private int[] getRandomPorts(int numberOfPorts) {
-        IntHashSet ports = new IntHashSet();
-
-        int nextPort = randomIntBetween(49152, 65535);
-        for (int i = 0; i < numberOfPorts; i++) {
-            boolean foundPortInRange = false;
-            while (!foundPortInRange) {
-                if (!ports.contains(nextPort)) {
-                    logger.debug("looking to see if port [{}]is available", nextPort);
-                    try (ServerSocket serverSocket = new ServerSocket()) {
-                        // Set SO_REUSEADDR as we may bind here and not be able
-                        // to reuse the address immediately without it.
-                        serverSocket.setReuseAddress(NetworkUtils.defaultReuseAddress());
-                        serverSocket.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), nextPort));
-
-                        // bind was a success
-                        logger.debug("port [{}] available.", nextPort);
-                        foundPortInRange = true;
-                        ports.add(nextPort);
-                    } catch (IOException e) {
-                        // Do nothing
-                        logger.debug("port [{}] not available.", e, nextPort);
-                    }
-                }
-                nextPort = randomIntBetween(49152, 65535);
-            }
-        }
-        return ports.toArray();
-    }
-
     private NettyTransport startNettyTransport(Settings settings, ThreadPool threadPool) {
         BigArrays bigArrays = new MockBigArrays(new PageCacheRecycler(settings, threadPool), new NoneCircuitBreakerService());
 
@@ -206,36 +143,4 @@ public class NettyTransportMultiPortTests extends ESTestCase {
         assertThat(nettyTransport.lifecycleState(), is(Lifecycle.State.STARTED));
         return nettyTransport;
     }
-
-    private void assertConnectionRefused(int port) throws Exception {
-        try {
-            trySocketConnection(new InetSocketTransportAddress(InetAddress.getByName(host), port).address());
-            fail("Expected to get exception when connecting to port " + port);
-        } catch (IOException e) {
-            // expected
-            logger.info("Got expected connection message {}", e.getMessage());
-        }
-    }
-
-    private void assertPortIsBound(int port) throws Exception {
-        assertPortIsBound(host, port);
-    }
-
-    private void assertPortIsBound(String host, int port) throws Exception {
-        logger.info("Trying to connect to [{}]:[{}]", host, port);
-        trySocketConnection(new InetSocketTransportAddress(InetAddress.getByName(host), port).address());
-    }
-
-    private void trySocketConnection(InetSocketAddress address) throws Exception {
-        try (Socket socket = new Socket()) {
-            logger.info("Connecting to {}", address);
-            socket.connect(address, 500);
-
-            assertThat(socket.isConnected(), is(true));
-            try (OutputStream os = socket.getOutputStream()) {
-                os.write("foo".getBytes(StandardCharsets.UTF_8));
-                os.flush();
-            }
-        }
-    }
 }

core/src/test/java/org/elasticsearch/transport/netty/SimpleNettyTransportTests.java

@@ -38,9 +38,7 @@ import static org.hamcrest.Matchers.containsString;
 public class SimpleNettyTransportTests extends AbstractSimpleTransportTestCase {
     @Override
     protected MockTransportService build(Settings settings, Version version, NamedWriteableRegistry namedWriteableRegistry) {
-        int startPort = 11000 + randomIntBetween(0, 255);
+        settings = Settings.builder().put(settings).put("transport.tcp.port", "0").build();
-        int endPort = startPort + 10;
-        settings = Settings.builder().put(settings).put("transport.tcp.port", startPort + "-" + endPort).build();
         MockTransportService transportService = new MockTransportService(settings, new NettyTransport(settings, threadPool, new NetworkService(settings), BigArrays.NON_RECYCLING_INSTANCE, version, namedWriteableRegistry), threadPool);
         transportService.start();
         return transportService;