[grid] Session can be deleted via Grid UI

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

@@ -19,6 +19,7 @@
 
 import static org.openqa.selenium.grid.config.StandardGridRoles.NODE_ROLE;
 import static org.openqa.selenium.grid.node.config.NodeOptions.DEFAULT_CONNECTION_LIMIT;
+import static org.openqa.selenium.grid.node.config.NodeOptions.DEFAULT_DELETE_SESSION_ON_UI;
 import static org.openqa.selenium.grid.node.config.NodeOptions.DEFAULT_DETECT_DRIVERS;
 import static org.openqa.selenium.grid.node.config.NodeOptions.DEFAULT_DRAIN_AFTER_SESSION_COUNT;
 import static org.openqa.selenium.grid.node.config.NodeOptions.DEFAULT_ENABLE_BIDI;
@@ -241,6 +242,13 @@ public class NodeFlags implements HasRoles {
   @ConfigValue(section = NODE_SECTION, name = "drain-after-session-count", example = "1")
   public int drainAfterSessionCount = DEFAULT_DRAIN_AFTER_SESSION_COUNT;
 
+  @Parameter(
+      names = {"--delete-session-on-ui"},
+      arity = 1,
+      description = "Enable capability to support deleting session on Grid UI. False by default")
+  @ConfigValue(section = NODE_SECTION, name = "delete-session-on-ui", example = "true")
+  public Boolean deleteSessionOnUi = DEFAULT_DELETE_SESSION_ON_UI;
+
   @Parameter(
       names = {"--enable-cdp"},
       arity = 1,

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

@@ -77,6 +77,7 @@ public class NodeOptions {
   public static final int DEFAULT_SESSION_TIMEOUT = 300;
   public static final int DEFAULT_DRAIN_AFTER_SESSION_COUNT = 0;
   public static final int DEFAULT_CONNECTION_LIMIT = 10;
+  public static final boolean DEFAULT_DELETE_SESSION_ON_UI = false;
   public static final boolean DEFAULT_ENABLE_CDP = true;
   public static final boolean DEFAULT_ENABLE_BIDI = true;
   static final String NODE_SECTION = "node";
@@ -303,6 +304,13 @@ public int getDrainAfterSessionCount() {
         DEFAULT_DRAIN_AFTER_SESSION_COUNT);
   }
 
+  @VisibleForTesting
+  boolean isSessionDeletedOnUi() {
+    return config
+        .getBool(NODE_SECTION, "delete-session-on-ui")
+        .orElse(DEFAULT_DELETE_SESSION_ON_UI);
+  }
+
   @VisibleForTesting
   boolean isVncEnabled() {
     List<String> vncEnvVars = DEFAULT_VNC_ENV_VARS;
@@ -750,6 +758,10 @@ public Capabilities enhanceStereotype(Capabilities capabilities) {
               .setCapability("se:vncEnabled", true)
               .setCapability("se:noVncPort", noVncPort());
     }
+    if (isSessionDeletedOnUi()) {
+      capabilities =
+          new PersistentCapabilities(capabilities).setCapability("se:deleteSessionOnUi", true);
+    }
     if (isManagedDownloadsEnabled() && canConfigureDownloadsDir(capabilities)) {
       capabilities = new PersistentCapabilities(capabilities).setCapability(ENABLE_DOWNLOADS, true);
     }

java/test/org/openqa/selenium/grid/node/config/NodeOptionsTest.java

@@ -764,6 +764,110 @@ void testIsVncEnabledAcceptSingleEnvVar() {
     assertThat(nodeOptionsEnabled.isVncEnabled()).isFalse();
   }
 
+  @Test
+  void deleteSessionOnUiIsEnabledByDefault() {
+    Config config = new MapConfig(singletonMap("node", singletonMap("detect-drivers", "false")));
+    NodeOptions nodeOptions = new NodeOptions(config);
+    assertThat(nodeOptions.isSessionDeletedOnUi()).isFalse();
+  }
+
+  @Test
+  void deleteSessionOnUiCanBeEnabledExplicitly() {
+    Config config =
+        new MapConfig(
+            singletonMap(
+                "node",
+                ImmutableMap.of("detect-drivers", "false", "delete-session-on-ui", "true")));
+    NodeOptions nodeOptions = new NodeOptions(config);
+    assertThat(nodeOptions.isSessionDeletedOnUi()).isTrue();
+  }
+
+  @Test
+  void deleteSessionOnUiCanBeDisabled() {
+    Config config =
+        new MapConfig(
+            singletonMap(
+                "node",
+                ImmutableMap.of("detect-drivers", "false", "delete-session-on-ui", "false")));
+    NodeOptions nodeOptions = new NodeOptions(config);
+    assertThat(nodeOptions.isSessionDeletedOnUi()).isFalse();
+  }
+
+  @Test
+  void deleteSessionOnUiCapabilityIsAddedWhenEnabled() {
+    assumeTrue(
+        new ChromeDriverInfo().isPresent() || new GeckoDriverInfo().isPresent(),
+        "A driver needs to be available");
+
+    Config config =
+        new MapConfig(
+            singletonMap(
+                "node", ImmutableMap.of("detect-drivers", "true", "delete-session-on-ui", "true")));
+
+    List<Capabilities> reported = new ArrayList<>();
+    new NodeOptions(config)
+        .getSessionFactories(
+            caps -> {
+              reported.add(caps);
+              return Collections.singleton(HelperFactory.create(config, caps));
+            });
+
+    assertThat(reported)
+        .filteredOn(capabilities -> capabilities.getCapability("se:deleteSessionOnUi") != null)
+        .hasSize(reported.size());
+
+    assertThat(reported)
+        .allMatch(
+            capabilities ->
+                Boolean.TRUE.equals(capabilities.getCapability("se:deleteSessionOnUi")));
+  }
+
+  @Test
+  void deleteSessionOnUiCapabilityIsNotAddedWhenDisabled() {
+    assumeTrue(
+        new ChromeDriverInfo().isPresent() || new GeckoDriverInfo().isPresent(),
+        "A driver needs to be available");
+
+    Config config =
+        new MapConfig(
+            singletonMap(
+                "node",
+                ImmutableMap.of("detect-drivers", "true", "delete-session-on-ui", "false")));
+
+    List<Capabilities> reported = new ArrayList<>();
+    new NodeOptions(config)
+        .getSessionFactories(
+            caps -> {
+              reported.add(caps);
+              return Collections.singleton(HelperFactory.create(config, caps));
+            });
+
+    assertThat(reported)
+        .filteredOn(capabilities -> capabilities.getCapability("se:deleteSessionOnUi") == null)
+        .hasSize(reported.size());
+  }
+
+  @Test
+  void deleteSessionOnUiCapabilityIsAddedByDefault() {
+    assumeTrue(
+        new ChromeDriverInfo().isPresent() || new GeckoDriverInfo().isPresent(),
+        "A driver needs to be available");
+
+    Config config = new MapConfig(singletonMap("node", singletonMap("detect-drivers", "true")));
+
+    List<Capabilities> reported = new ArrayList<>();
+    new NodeOptions(config)
+        .getSessionFactories(
+            caps -> {
+              reported.add(caps);
+              return Collections.singleton(HelperFactory.create(config, caps));
+            });
+
+    assertThat(reported)
+        .filteredOn(capabilities -> capabilities.getCapability("se:deleteSessionOnUi") == null)
+        .hasSize(reported.size());
+  }
+
   private Condition<? super List<? extends Capabilities>> supporting(String name) {
     return new Condition<>(
         caps -> caps.stream().anyMatch(cap -> name.equals(cap.getBrowserName())),