Move resolvePublishPort from TcpTransport -> Transport.

Signed-off-by: Finn Carroll <carrofin@amazon.com>

server/src/main/java/org/opensearch/transport/TcpTransport.java

@@ -521,7 +521,7 @@ private BoundTransportAddress createBoundTransportAddress(ProfileSettings profil
             throw new BindTransportException("Failed to resolve publish address", e);
         }
 
-        final int publishPort = resolvePublishPort(profileSettings.publishPort, boundAddresses, publishInetAddress);
+        final int publishPort = Transport.resolvePublishPort(profileSettings.publishPort, boundAddresses, publishInetAddress);
         if (publishPort == -1) {
             String profileExplanation = profileSettings.isDefaultProfile ? "" : " for profile " + profileSettings.profileName;
             throw new BindTransportException(
@@ -543,45 +543,8 @@ private BoundTransportAddress createBoundTransportAddress(ProfileSettings profil
         return new BoundTransportAddress(transportBoundAddresses, publishAddress);
     }
 
-    /**
-     * Resolve the publishPort for a server provided a list of boundAddresses and a publishInetAddress.
-     * Resolution strategy is as follows:
-     * If a configured port exists resolve to that port.
-     * If a bound address matches the publishInetAddress resolve to that port.
-     * If a bound address is a wildcard address resolve to that port.
-     * If all bound addresses share the same port resolve to that port.
-     *
-     * @param publishPort -1 if no configured publish port exists
-     * @param boundAddresses addresses bound by the server
-     * @param publishInetAddress address published for the server
-     * @return Resolved port. If publishPort is negative and no port can be resolved return publishPort.
-     */
-    public static int resolvePublishPort(int publishPort, List<InetSocketAddress> boundAddresses, InetAddress publishInetAddress) {
-        if (publishPort < 0) {
-            for (InetSocketAddress boundAddress : boundAddresses) {
-                InetAddress boundInetAddress = boundAddress.getAddress();
-                if (boundInetAddress.isAnyLocalAddress() || boundInetAddress.equals(publishInetAddress)) {
-                    publishPort = boundAddress.getPort();
-                    break;
-                }
-            }
-        }
-
-        if (publishPort < 0) {
-            final Set<Integer> ports = new HashSet<>();
-            for (InetSocketAddress boundAddress : boundAddresses) {
-                ports.add(boundAddress.getPort());
-            }
-            if (ports.size() == 1) {
-                publishPort = ports.iterator().next();
-            }
-        }
-
-        return publishPort;
-    }
-
     public static int resolveTransportPublishPort(int publishPort, List<TransportAddress> boundAddresses, InetAddress publishInetAddress) {
-        return resolvePublishPort(
+        return Transport.resolvePublishPort(
             publishPort,
             boundAddresses.stream().map(TransportAddress::address).collect(Collectors.toList()),
             publishInetAddress

server/src/main/java/org/opensearch/transport/Transport.java

@@ -47,11 +47,15 @@
 
 import java.io.Closeable;
 import java.io.IOException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.function.Predicate;
 
@@ -111,6 +115,43 @@ default boolean isSecure() {
 
     RequestHandlers getRequestHandlers();
 
+    /**
+     * Resolve the publishPort for a server provided a list of boundAddresses and a publishInetAddress.
+     * Resolution strategy is as follows:
+     * If a configured port exists resolve to that port.
+     * If a bound address matches the publishInetAddress resolve to that port.
+     * If a bound address is a wildcard address resolve to that port.
+     * If all bound addresses share the same port resolve to that port.
+     *
+     * @param publishPort -1 if no configured publish port exists
+     * @param boundAddresses addresses bound by the server
+     * @param publishInetAddress address published for the server
+     * @return Resolved port. If publishPort is negative and no port can be resolved return publishPort.
+     */
+    static int resolvePublishPort(int publishPort, List<InetSocketAddress> boundAddresses, InetAddress publishInetAddress) {
+        if (publishPort < 0) {
+            for (InetSocketAddress boundAddress : boundAddresses) {
+                InetAddress boundInetAddress = boundAddress.getAddress();
+                if (boundInetAddress.isAnyLocalAddress() || boundInetAddress.equals(publishInetAddress)) {
+                    publishPort = boundAddress.getPort();
+                    break;
+                }
+            }
+        }
+
+        if (publishPort < 0) {
+            final Set<Integer> ports = new HashSet<>();
+            for (InetSocketAddress boundAddress : boundAddresses) {
+                ports.add(boundAddress.getPort());
+            }
+            if (ports.size() == 1) {
+                publishPort = ports.iterator().next();
+            }
+        }
+
+        return publishPort;
+    }
+
     /**
      * A unidirectional connection to a {@link DiscoveryNode}
      *

server/src/test/java/org/opensearch/transport/PublishPortTests.java

@@ -43,7 +43,6 @@
 
 import static java.net.InetAddress.getByName;
 import static java.util.Arrays.asList;
-import static org.opensearch.transport.TcpTransport.resolvePublishPort;
 import static org.hamcrest.Matchers.equalTo;
 
 public class PublishPortTests extends OpenSearchTestCase {
@@ -72,43 +71,43 @@ public void testPublishPort() throws Exception {
 
         }
 
-        int publishPort = resolvePublishPort(
+        int publishPort = Transport.resolvePublishPort(
             new TcpTransport.ProfileSettings(settings, profile).publishPort,
             randomAddresses(),
             getByName("127.0.0.2")
         );
         assertThat("Publish port should be explicitly set", publishPort, equalTo(useProfile ? 9080 : 9081));
 
-        publishPort = resolvePublishPort(
+        publishPort = Transport.resolvePublishPort(
             new TcpTransport.ProfileSettings(baseSettings, profile).publishPort,
             asList(address("127.0.0.1", boundPort), address("127.0.0.2", otherBoundPort)),
             getByName("127.0.0.1")
         );
         assertThat("Publish port should be derived from matched address", publishPort, equalTo(boundPort));
 
-        publishPort = resolvePublishPort(
+        publishPort = Transport.resolvePublishPort(
             new TcpTransport.ProfileSettings(baseSettings, profile).publishPort,
             asList(address("127.0.0.1", boundPort), address("127.0.0.2", boundPort)),
             getByName("127.0.0.3")
         );
         assertThat("Publish port should be derived from unique port of bound addresses", publishPort, equalTo(boundPort));
 
-        int resPort = resolvePublishPort(
+        int resPort = Transport.resolvePublishPort(
             new TcpTransport.ProfileSettings(baseSettings, profile).publishPort,
             asList(address("127.0.0.1", boundPort), address("127.0.0.2", otherBoundPort)),
             getByName("127.0.0.3")
         );
         assertThat("as publish_port not specified and non-unique port of bound addresses", resPort, equalTo(-1));
 
-        publishPort = resolvePublishPort(
+        publishPort = Transport.resolvePublishPort(
             new TcpTransport.ProfileSettings(baseSettings, profile).publishPort,
             asList(address("0.0.0.0", boundPort), address("127.0.0.2", otherBoundPort)),
             getByName("127.0.0.1")
         );
         assertThat("Publish port should be derived from matching wildcard address", publishPort, equalTo(boundPort));
 
         if (NetworkUtils.SUPPORTS_V6) {
-            publishPort = resolvePublishPort(
+            publishPort = Transport.resolvePublishPort(
                 new TcpTransport.ProfileSettings(baseSettings, profile).publishPort,
                 asList(address("0.0.0.0", boundPort), address("127.0.0.2", otherBoundPort)),
                 getByName("::1")