[grid] Add Node session-history endpoint and write to local file for other utility to consume

java/src/org/openqa/selenium/grid/data/SessionHistoryEntry.java

@@ -0,0 +1,66 @@
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.openqa.selenium.grid.data;
+
+import java.time.Instant;
+import java.util.Objects;
+import org.openqa.selenium.internal.Require;
+import org.openqa.selenium.remote.SessionId;
+
+public class SessionHistoryEntry {
+  private final SessionId sessionId;
+  private final Instant startTime;
+  private Instant stopTime;
+
+  public SessionHistoryEntry(SessionId sessionId, Instant startTime, Instant stopTime) {
+    this.sessionId = Require.nonNull("Session ID", sessionId);
+    this.startTime = Require.nonNull("Start time", startTime);
+    this.stopTime = stopTime; // Can be null for ongoing sessions
+  }
+
+  public SessionId getSessionId() {
+    return sessionId;
+  }
+
+  public Instant getStartTime() {
+    return startTime;
+  }
+
+  public Instant getStopTime() {
+    return stopTime;
+  }
+
+  public void setStopTime(Instant stopTime) {
+    this.stopTime = stopTime;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (!(o instanceof SessionHistoryEntry)) return false;
+    SessionHistoryEntry that = (SessionHistoryEntry) o;
+    return Objects.equals(sessionId, that.sessionId)
+        && Objects.equals(startTime, that.startTime)
+        && Objects.equals(stopTime, that.stopTime);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(sessionId, startTime, stopTime);
+  }
+}

java/src/org/openqa/selenium/grid/data/SessionStartedEvent.java

@@ -0,0 +1,40 @@
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.openqa.selenium.grid.data;
+
+import java.util.function.Consumer;
+import org.openqa.selenium.events.Event;
+import org.openqa.selenium.events.EventListener;
+import org.openqa.selenium.events.EventName;
+import org.openqa.selenium.internal.Require;
+import org.openqa.selenium.remote.SessionId;
+
+public class SessionStartedEvent extends Event {
+
+  private static final EventName SESSION_STARTED = new EventName("session-started");
+
+  public SessionStartedEvent(SessionId id) {
+    super(SESSION_STARTED, id);
+  }
+
+  public static EventListener<SessionId> listener(Consumer<SessionId> handler) {
+    Require.nonNull("Handler", handler);
+
+    return new EventListener<>(SESSION_STARTED, SessionId.class, handler);
+  }
+}

java/src/org/openqa/selenium/grid/node/GetNodeSessionHistory.java

@@ -0,0 +1,45 @@
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.openqa.selenium.grid.node;
+
+import static org.openqa.selenium.remote.http.Contents.asJson;
+
+import com.google.common.collect.ImmutableMap;
+import java.io.UncheckedIOException;
+import java.util.List;
+import org.openqa.selenium.grid.data.SessionHistoryEntry;
+import org.openqa.selenium.internal.Require;
+import org.openqa.selenium.remote.http.HttpHandler;
+import org.openqa.selenium.remote.http.HttpRequest;
+import org.openqa.selenium.remote.http.HttpResponse;
+
+class GetNodeSessionHistory implements HttpHandler {
+
+  private final Node node;
+
+  GetNodeSessionHistory(Node node) {
+    this.node = Require.nonNull("Node", node);
+  }
+
+  @Override
+  public HttpResponse execute(HttpRequest req) throws UncheckedIOException {
+    List<SessionHistoryEntry> sessionHistory = node.getSessionHistory();
+
+    return new HttpResponse().setContent(asJson(ImmutableMap.of("value", sessionHistory)));
+  }
+}

java/src/org/openqa/selenium/grid/node/Node.java

@@ -29,6 +29,8 @@
 import java.io.IOException;
 import java.net.URI;
 import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 import java.util.ServiceLoader;
 import java.util.Set;
@@ -45,6 +47,7 @@
 import org.openqa.selenium.grid.data.NodeId;
 import org.openqa.selenium.grid.data.NodeStatus;
 import org.openqa.selenium.grid.data.Session;
+import org.openqa.selenium.grid.data.SessionHistoryEntry;
 import org.openqa.selenium.grid.security.RequiresSecretFilter;
 import org.openqa.selenium.grid.security.Secret;
 import org.openqa.selenium.internal.Either;
@@ -189,6 +192,9 @@ protected Node(
             delete("/se/grid/node/session/{sessionId}")
                 .to(params -> new StopNodeSession(this, sessionIdFrom(params)))
                 .with(spanDecorator("node.stop_session").andThen(requiresSecret)),
+            get("/se/grid/node/session-history")
+                .to(() -> new GetNodeSessionHistory(this))
+                .with(spanDecorator("node.get_session_history").andThen(requiresSecret)),
             get("/se/grid/node/session/{sessionId}")
                 .to(params -> new GetNodeSession(this, sessionIdFrom(params)))
                 .with(spanDecorator("node.get_session").andThen(requiresSecret)),
@@ -268,6 +274,10 @@ public TemporaryFilesystem getDownloadsFilesystem(SessionId id) throws IOExcepti
 
   public abstract HealthCheck getHealthCheck();
 
+  public List<SessionHistoryEntry> getSessionHistory() {
+    return new ArrayList<>();
+  }
+
   public Duration getSessionTimeout() {
     return sessionTimeout;
   }

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

@@ -283,6 +283,27 @@ public class NodeFlags implements HasRoles {
   @ConfigValue(section = NODE_SECTION, name = "enable-managed-downloads", example = "false")
   public Boolean managedDownloadsEnabled;
 
+  @Parameter(
+      names = {"--status-to-file"},
+      description =
+          "Path to a local file where the Node will write its status information "
+              + "in JSON format. This file will be updated periodically and can be "
+              + "consumed by other services running on the same machine.")
+  @ConfigValue(section = NODE_SECTION, name = "status-to-file", example = "node-status.json")
+  public String statusFile;
+
+  @Parameter(
+      names = {"--session-history-to-file"},
+      description =
+          "Path to a local file where the Node will write session history information "
+              + "in JSON format. This file will contain chronological records of session "
+              + "start and stop events with sessionId, startTime, and stopTime.")
+  @ConfigValue(
+      section = NODE_SECTION,
+      name = "session-history-to-file",
+      example = "session-history.json")
+  public String sessionHistoryFile;
+
   @Override
   public Set<Role> getRoles() {
     return Collections.singleton(NODE_ROLE);

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

@@ -168,6 +168,14 @@ public boolean isManagedDownloadsEnabled() {
     return config.getBool(NODE_SECTION, "enable-managed-downloads").orElse(Boolean.FALSE);
   }
 
+  public Optional<String> getStatusFile() {
+    return config.get(NODE_SECTION, "status-to-file");
+  }
+
+  public Optional<String> getSessionHistoryFile() {
+    return config.get(NODE_SECTION, "session-history-to-file");
+  }
+
   public String getGridSubPath() {
     return normalizeSubPath(getPublicGridUri().map(URI::getPath).orElse(""));
   }