[grid] Enabling live view for Dynamic Grid

We were hardcoding 'localhost', which works
in most of the cases, but when Dynamic Grid
is used, the stream needs to be routed once
more, and for that, we can use the container
IP.

java/src/org/openqa/selenium/grid/node/config/DriverServiceSessionFactory.java

@@ -17,6 +17,10 @@
 
 package org.openqa.selenium.grid.node.config;
 
+import static org.openqa.selenium.remote.RemoteTags.CAPABILITIES;
+import static org.openqa.selenium.remote.RemoteTags.CAPABILITIES_EVENT;
+import static org.openqa.selenium.remote.tracing.Tags.EXCEPTION;
+
 import org.openqa.selenium.Capabilities;
 import org.openqa.selenium.ImmutableCapabilities;
 import org.openqa.selenium.PersistentCapabilities;
@@ -30,6 +34,8 @@
 import org.openqa.selenium.grid.node.SessionFactory;
 import org.openqa.selenium.internal.Either;
 import org.openqa.selenium.internal.Require;
+import org.openqa.selenium.net.HostIdentifier;
+import org.openqa.selenium.net.NetworkUtils;
 import org.openqa.selenium.remote.Command;
 import org.openqa.selenium.remote.Dialect;
 import org.openqa.selenium.remote.DriverCommand;
@@ -56,10 +62,6 @@
 import java.util.function.Predicate;
 import java.util.stream.Stream;
 
-import static org.openqa.selenium.remote.RemoteTags.CAPABILITIES;
-import static org.openqa.selenium.remote.RemoteTags.CAPABILITIES_EVENT;
-import static org.openqa.selenium.remote.tracing.Tags.EXCEPTION;
-
 public class DriverServiceSessionFactory implements SessionFactory {
 
   private final Tracer tracer;
@@ -227,9 +229,11 @@ public DevToolsInfo(URI cdpEndpoint, String version) {
   private Capabilities readVncEndpoint(Capabilities requestedCaps, Capabilities returnedCaps) {
     String seVncEnabledCap = "se:vncEnabled";
     String seVncEnabled = String.valueOf(requestedCaps.getCapability(seVncEnabledCap));
-    if (Boolean.parseBoolean(seVncEnabled)) {
+    boolean vncLocalAddressSet = requestedCaps.getCapabilityNames().contains("se:vncLocalAddress");
+    if (Boolean.parseBoolean(seVncEnabled) && !vncLocalAddressSet) {
+      String vncLocalAddress = String.format("ws://%s:7900", getHost());
       returnedCaps = new PersistentCapabilities(returnedCaps)
-        .setCapability("se:vncLocalAddress", "ws://localhost:7900/websockify")
+        .setCapability("se:vncLocalAddress", vncLocalAddress)
         .setCapability(seVncEnabledCap, true);
     }
     return returnedCaps;
@@ -244,4 +248,13 @@ private Capabilities generalizePlatform(Capabilities caps) {
   private Capabilities setInitialPlatform(Capabilities caps, Platform platform) {
     return new PersistentCapabilities(caps).setCapability("platformName", platform);
   }
+
+  private String getHost() {
+    try {
+      return new NetworkUtils().getNonLoopbackAddressOfThisMachine();
+    } catch (WebDriverException e) {
+      return HostIdentifier.getHostName();
+    }
+
+  }
 }