Fix NPE concerning connection events of unauthenticated devices.

Signed-off-by: Carsten Lohmann <carsten.lohmann@bosch.io>

Author: calohmn

adapter-base/src/main/java/org/eclipse/hono/adapter/AbstractProtocolAdapterBase.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Contributors to the Eclipse Foundation
+ * Copyright (c) 2016, 2022 Contributors to the Eclipse Foundation
  *
  * See the NOTICE file(s) distributed with this work for additional
  * information regarding copyright ownership.
@@ -936,8 +936,10 @@ public void registerLivenessChecks(final HealthCheckHandler handler) {
      */
     protected Future<Void> sendConnectedEvent(final String remoteId, final Device authenticatedDevice, final SpanContext context) {
         if (this.connectionEventProducer != null) {
-            return getTenantClient().get(authenticatedDevice.getTenantId(), context)
-                    .map(this::getEventSender)
+            return Optional.ofNullable(authenticatedDevice)
+                    .map(device -> getTenantClient().get(device.getTenantId(), context)
+                            .map(this::getEventSender))
+                    .orElseGet(() -> Future.succeededFuture(null))
                     .compose(es -> this.connectionEventProducer.connected(
                             new ConnectionEventProducer.Context() {
                                 @Override
@@ -972,8 +974,10 @@ public TenantClient getTenantClient() {
      */
     protected Future<Void> sendDisconnectedEvent(final String remoteId, final Device authenticatedDevice, final SpanContext context) {
         if (this.connectionEventProducer != null) {
-            return getTenantClient().get(authenticatedDevice.getTenantId(), context)
-                    .map(this::getEventSender)
+            return Optional.ofNullable(authenticatedDevice)
+                    .map(device -> getTenantClient().get(device.getTenantId(), context)
+                            .map(this::getEventSender))
+                    .orElseGet(() -> Future.succeededFuture(null))
                     .compose(es -> this.connectionEventProducer.disconnected(
                             new ConnectionEventProducer.Context() {
                                 @Override

adapter-base/src/main/java/org/eclipse/hono/adapter/monitoring/AbstractMessageSenderConnectionEventProducer.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Contributors to the Eclipse Foundation
+ * Copyright (c) 2016, 2022 Contributors to the Eclipse Foundation
  *
  * See the NOTICE file(s) distributed with this work for additional
  * information regarding copyright ownership.
@@ -12,6 +12,8 @@
  *******************************************************************************/
 package org.eclipse.hono.adapter.monitoring;
 
+import java.util.Optional;
+
 import org.eclipse.hono.auth.Device;
 import org.eclipse.hono.util.EventConstants;
 import org.eclipse.hono.util.RegistrationAssertion;
@@ -84,13 +86,15 @@ private Future<Void> sendNotificationEvent(
                         payload.put("data", data);
                     }
 
-                    return context.getMessageSenderClient().sendEvent(
-                            tenant,
-                            new RegistrationAssertion(deviceId),
-                            EventConstants.EVENT_CONNECTION_NOTIFICATION_CONTENT_TYPE,
-                            payload.toBuffer(),
-                            null,
-                            spanContext);
+                    return Optional.ofNullable(context.getMessageSenderClient())
+                            .map(client -> client.sendEvent(
+                                    tenant,
+                                    new RegistrationAssertion(deviceId),
+                                    EventConstants.EVENT_CONNECTION_NOTIFICATION_CONTENT_TYPE,
+                                    payload.toBuffer(),
+                                    null,
+                                    spanContext))
+                            .orElseGet(Future::succeededFuture);
                 });
     }
 }

adapter-base/src/main/java/org/eclipse/hono/adapter/monitoring/ConnectionEventProducer.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016, 2021 Contributors to the Eclipse Foundation
+ * Copyright (c) 2016, 2022 Contributors to the Eclipse Foundation
  *
  * See the NOTICE file(s) distributed with this work for additional
  * information regarding copyright ownership.
@@ -49,9 +49,13 @@ interface Context {
 
         /**
          * Gets the client for sending connection events downstream.
+         * <p>
+         * If no client is available in this context, {@code null} is returned. 
+         * <p>
+         * A returned client here is required to be initialized and started.
          *
          * @return The instance of the message sender client which the {@link ConnectionEventProducer} should
-         *         use. This client has to be initialized and started.
+         *         use or {@code null} if no client is available. 
          */
         EventSender getMessageSenderClient();
         /**

site/homepage/content/release-notes.md

@@ -12,6 +12,7 @@ description = "Information about changes in recent Hono releases. Includes new f
   password hashes were created in lowercase instead of uppercase. This has been fixed.
 * The native executable of the Command Router component did not start when configured with an embedded cache.
   This has been fixed.
+* There was an issue trying to send connection events concerning unauthenticated MQTT/AMQP devices. This has been fixed.
 
 ## 1.11.1